阅读说明：本技术 一种液压系统、检修作业设备以及检修系统 (Hydraulic system, maintenance operation equipment and maintenance system ) 是由 卿丽纯 郭方云 徐亮 肖久焜 李红术 许乐平 于 2021-08-23 设计创作，主要内容包括：本申请实施例提供一种液压系统、检修作业设备以及检修系统,属于检修作业技术领域,包括主动变幅缸、至少一个主动调平缸以及至少一个被动调平缸。每个被动调平缸的有杆腔与主动调平缸的有杆腔选择性地连通,每个被动调平缸的无杆腔与主动调平缸的无杆腔选择性地连通,所有主动调平缸的有杆腔的截面积之和小于所有被动调平缸的有杆腔的截面积之和,所有主动调平缸的无杆腔的截面积之和小于所有被动调平缸的无杆腔的截面积之和,以使被动调平缸的伸缩速率小于主动调平缸的伸缩速率；主动调平缸与主动变幅缸同步运动,被动调平缸与主动调平缸同步运动。通过缩短被动调平缸的行程和总长度,有利于检修作业设备小型化。(The embodiment of the application provides a hydraulic system, overhaul operation equipment and overhaul system, belongs to overhaul operation technical field, and including the initiative jar that becomes width of cloth, at least one initiative leveling cylinder and at least one passive leveling cylinder. The rod cavity of each passive leveling cylinder is selectively communicated with the rod cavity of the active leveling cylinder, the rodless cavity of each passive leveling cylinder is selectively communicated with the rodless cavity of the active leveling cylinder, the sum of the sectional areas of the rod cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rod cavities of all the passive leveling cylinders, and the sum of the sectional areas of the rodless cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rodless cavities of all the passive leveling cylinders, so that the expansion and contraction speed of the passive leveling cylinders is smaller than the expansion and contraction speed of the active leveling cylinders; the active leveling cylinder and the active amplitude-variable cylinder move synchronously, and the passive leveling cylinder and the active leveling cylinder move synchronously. The stroke and the total length of the passive leveling cylinder are shortened, so that the miniaturization of maintenance operation equipment is facilitated.)

1. A hydraulic system for overhauling operation equipment is characterized by comprising an active amplitude-changing cylinder, at least one active leveling cylinder and at least one passive leveling cylinder; the rod cavity of each passive leveling cylinder is selectively communicated with the rod cavity of the active leveling cylinder, the rodless cavity of each passive leveling cylinder is selectively communicated with the rodless cavity of the active leveling cylinder, the sum of the sectional areas of the rod cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rod cavities of all the passive leveling cylinders, and the sum of the sectional areas of the rodless cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rodless cavities of all the passive leveling cylinders, so that the expansion and contraction speed of the passive leveling cylinders is smaller than the expansion and contraction speed of the active leveling cylinders; the active leveling cylinder is configured to move synchronously with the active amplitude cylinder, and the passive leveling cylinder is configured to move synchronously with the active leveling cylinder.

2. The hydraulic system as claimed in claim 1, wherein the number of the passive leveling cylinders is plural, and the specifications of the plural passive leveling cylinders are uniform.

3. The hydraulic system according to claim 2, wherein the number of the active leveling cylinders is one, the number of the passive leveling cylinders is two, the active leveling cylinders and the passive leveling cylinders have the same cylinder diameter, the active leveling cylinders and the passive leveling cylinders have the same rod diameter, and the stroke of the active leveling cylinders is twice that of the passive leveling cylinders.

4. The hydraulic system as claimed in any one of claims 1 to 3, further comprising a leveling spill valve block and an oil tank; when the rod cavity or the rodless cavity of the active leveling cylinder is overloaded, the rod cavity and the rodless cavity of the active leveling cylinder are communicated with the oil tank through the leveling overflow valve group so that the active leveling cylinder can relieve pressure; when the active leveling cylinder is not overloaded and the leveling overflow valve group does not supply oil to the active leveling cylinder, the leveling overflow valve group is configured to prevent hydraulic oil in the active leveling cylinder from flowing out through the leveling overflow valve group.

5. The hydraulic system according to claim 4, wherein the leveling overflow valve group comprises a first oil path, a second oil path, a hydraulic lock and an unloading valve group, one end of the first oil path is communicated with the hydraulic lock, the other end of the first oil path is communicated with the rod cavity of the active leveling cylinder, one end of the second oil path is communicated with the hydraulic lock, the other end of the second oil path is communicated with the rodless cavity of the active leveling cylinder, and the unloading valve group is connected between the first oil path and the second oil path; when the hydraulic lock does not supply oil to the active leveling cylinder, the hydraulic lock is configured to prevent hydraulic oil in the active leveling cylinder from flowing out through the hydraulic lock; when the active leveling cylinder is overloaded, a rod cavity and a rodless cavity of the active leveling cylinder are communicated with the oil tank through the unloading valve bank so that the active leveling cylinder can relieve pressure; when the active leveling cylinder is not overloaded, the rod cavity and the rodless cavity of the active leveling cylinder are both stopped from the oil tank through the unloading valve bank.

6. The hydraulic system according to claim 5, wherein the unloading valve group comprises a shuttle valve, an overflow valve, a first check valve, a second check valve and an unloading oil path, one oil inlet of the shuttle valve is communicated with the first oil path, the other oil inlet of the shuttle valve is communicated with the second oil path, one end of the unloading oil path is communicated with an oil outlet of the shuttle valve, the other end of the unloading oil path is communicated with the oil tank, the overflow valve is connected in series with the unloading oil path, an oil inlet side of the first check valve is communicated with the unloading oil path at the downstream of the overflow valve, an oil outlet side of the first check valve is communicated with the first oil path, an oil inlet side of the second check valve is communicated with the unloading oil path at the downstream of the overflow valve, and an oil outlet side of the second check valve is communicated with the second oil path.

7. The hydraulic system as recited in any one of claims 1 to 3 wherein the hydraulic control system further comprises a switching valve and an oil source that supplies oil alternatively to the active luffing cylinder and the active leveling cylinder through the switching valve.

8. The hydraulic system as claimed in any one of claims 1 to 3, further comprising a first set of bidirectional balancing valves, wherein each passive leveling cylinder is provided with the first set of bidirectional balancing valves, the rod cavity of the active leveling cylinder is selectively communicated with the rod cavity of each passive leveling cylinder through the corresponding first set of bidirectional balancing valves, and the rod-less cavity of the active leveling cylinder is selectively communicated with the rod-less cavity of each passive leveling cylinder through the corresponding first set of bidirectional balancing valves; when a piston rod of the active leveling cylinder stops stretching, a rod cavity of the passive leveling cylinder and a rod cavity of the active leveling cylinder are stopped by corresponding to the first bidirectional balancing valve group, and a rodless cavity of the passive leveling cylinder and a rodless cavity of the active leveling cylinder are stopped by corresponding to the first bidirectional balancing valve group; when the piston rod of the active leveling cylinder stretches, the rod cavity of the passive leveling cylinder is communicated with the rod cavity of the active leveling cylinder through corresponding to the first bidirectional balancing valve group, and the rod-free cavity of the passive leveling cylinder is communicated with the rod-free cavity of the active leveling cylinder through corresponding to the first bidirectional balancing valve group.

9. The utility model provides an overhaul operation equipment, its characterized in that includes revolving stage, first arm, rocking arm, goes up revolving stage, second arm, passive arm assembly, work platform and levelling device down, levelling device includes:

the first amplitude cylinder is connected with the lower rotary table and the first arm so that the first arm can rotate around the lower rotary table;

a first leveling cylinder connecting the first arm and the rocker arm so that the rocker arm can rotate around the first arm;

the hydraulic system as claimed in any one of claims 1 to 8, wherein the active luffing cylinder is connected to the upper rotating table and the second arm so as to enable the second arm to rotate around the upper rotating table, the active leveling cylinder is connected to the upper rotating table and the second arm, and the passive leveling cylinder is connected to the second arm and the passive arm assembly so as to enable the passive arm assembly to rotate around the second arm; and

the second leveling cylinder is connected with the driven arm assembly and the working platform so that the working platform can rotate around the driven arm assembly;

the passive leveling cylinder and the active leveling cylinder synchronously move, and the active leveling cylinder and the active amplitude-changing cylinder synchronously move, so that the working platform translates around the lower rotary table.

10. The service work apparatus of claim 9, wherein the passive arm assembly comprises a third arm, a linkage mechanism, and a leveling arm, the leveling device further comprising a second luffing cylinder; the passive leveling cylinder is connected with the second arm and the third arm so that the third arm can rotate around the second arm; the connecting rod mechanism is connected with the third arm and the leveling arm so that the leveling arm can translate around the third arm, the second amplitude cylinder is connected with the third arm and the connecting rod mechanism so that the connecting rod mechanism can rotate around the third arm, and the second leveling cylinder is connected with the leveling arm and the working platform so that the working platform can rotate around the leveling arm;

the first leveling cylinder and the second leveling cylinder alternatively move synchronously with the first amplitude cylinder so as to enable the working platform to translate around the lower rotary table.

11. An inspection system, comprising:

a chassis; and

the service work apparatus according to claim 9 or 10, mounted to the chassis.

Technical Field

The application relates to the technical field of maintenance operation, in particular to a hydraulic system, maintenance operation equipment and a maintenance system.

Background

In the related art, the maintenance work equipment needs to be arranged in a limited space, and the work platform of the maintenance work equipment needs to be kept basically horizontal, however, when the work platform of the maintenance work equipment can be kept basically horizontal, the maintenance work equipment in the related art occupies a large space, and faces the problem of miniaturization.

Disclosure of Invention

In view of this, it is desirable to provide a hydraulic system, a maintenance operation device, and a maintenance system, so as to reduce the volume of the maintenance operation device and miniaturize the maintenance operation device.

In order to achieve the above object, an aspect of the embodiments of the present application provides a hydraulic system for overhauling operation equipment, which is characterized by comprising an active amplitude cylinder, at least one active leveling cylinder, and at least one passive leveling cylinder; the rod cavity of each passive leveling cylinder is selectively communicated with the rod cavity of the active leveling cylinder, the rodless cavity of each passive leveling cylinder is selectively communicated with the rodless cavity of the active leveling cylinder, the sum of the sectional areas of the rod cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rod cavities of all the passive leveling cylinders, and the sum of the sectional areas of the rodless cavities of all the active leveling cylinders is smaller than the sum of the sectional areas of the rodless cavities of all the passive leveling cylinders, so that the expansion and contraction speed of the passive leveling cylinders is smaller than the expansion and contraction speed of the active leveling cylinders; the active leveling cylinder is configured to move synchronously with the active amplitude cylinder, and the passive leveling cylinder is configured to move synchronously with the active leveling cylinder.

In one embodiment, the number of the passive leveling cylinders is multiple, and the specifications of the passive leveling cylinders are consistent.

In one embodiment, the number of the active leveling cylinders is one, the number of the passive leveling cylinders is two, the diameters of the active leveling cylinders and the passive leveling cylinders are the same, the rod diameters of the active leveling cylinders and the passive leveling cylinders are the same, and the stroke of the active leveling cylinders is twice that of the passive leveling cylinders.

In one embodiment, the hydraulic system further comprises a leveling overflow valve group and an oil tank; when the rod cavity or the rodless cavity of the active leveling cylinder is overloaded, the rod cavity and the rodless cavity of the active leveling cylinder are communicated with the oil tank through the leveling overflow valve group so that the active leveling cylinder can relieve pressure; when the active leveling cylinder is not overloaded and the leveling overflow valve group does not supply oil to the active leveling cylinder, the leveling overflow valve group is configured to prevent hydraulic oil in the active leveling cylinder from flowing out through the leveling overflow valve group.

In one embodiment, the leveling overflow valve group comprises a first oil path, a second oil path, a hydraulic lock and an unloading valve group, wherein one end of the first oil path is communicated with the hydraulic lock, the other end of the first oil path is communicated with a rod cavity of the active leveling cylinder, one end of the second oil path is communicated with the hydraulic lock, the other end of the second oil path is communicated with a rodless cavity of the active leveling cylinder, and the unloading valve group is connected between the first oil path and the second oil path; when the hydraulic lock does not supply oil to the active leveling cylinder, the hydraulic lock is configured to prevent hydraulic oil in the active leveling cylinder from flowing out through the hydraulic lock; when the active leveling cylinder is overloaded, a rod cavity and a rodless cavity of the active leveling cylinder are communicated with the oil tank through the unloading valve bank so that the active leveling cylinder can relieve pressure; when the active leveling cylinder is not overloaded, the rod cavity and the rodless cavity of the active leveling cylinder are both stopped from the oil tank through the unloading valve bank.

In one embodiment, the unloading valve group includes a shuttle valve, an overflow valve, a first check valve, a second check valve, and an unloading oil path, one of the oil inlets of the shuttle valve is communicated with the first oil path, the other oil inlet of the shuttle valve is communicated with the second oil path, one end of the unloading oil path is communicated with the oil outlet of the shuttle valve, the other end of the unloading oil path is communicated with the oil tank, the overflow valve is connected in series to the unloading oil path, the oil inlet side of the first check valve is communicated with the unloading oil path at the downstream of the overflow valve, the oil outlet side of the first check valve is communicated with the first oil path, the oil inlet side of the second check valve is communicated with the unloading oil path at the downstream of the overflow valve, and the oil outlet side of the second check valve is communicated with the second oil path.

In one embodiment, the hydraulic control system further comprises a switching valve and an oil source, and the oil source supplies oil alternatively to the active amplitude cylinder and the active leveling cylinder through the switching valve.

In one embodiment, the hydraulic system further includes a first bidirectional balancing valve group, each passive leveling cylinder is correspondingly provided with the first bidirectional balancing valve group, the rod cavity of the active leveling cylinder is selectively communicated with the rod cavity of each passive leveling cylinder through the corresponding first bidirectional balancing valve group, and the rodless cavity of the active leveling cylinder is selectively communicated with the rodless cavity of each passive leveling cylinder through the corresponding first bidirectional balancing valve group; when a piston rod of the active leveling cylinder stops stretching, a rod cavity of the passive leveling cylinder and a rod cavity of the active leveling cylinder are stopped by corresponding to the first bidirectional balancing valve group, and a rodless cavity of the passive leveling cylinder and a rodless cavity of the active leveling cylinder are stopped by corresponding to the first bidirectional balancing valve group; when the piston rod of the active leveling cylinder stretches, the rod cavity of the passive leveling cylinder is communicated with the rod cavity of the active leveling cylinder through corresponding to the first bidirectional balancing valve group, and the rod-free cavity of the passive leveling cylinder is communicated with the rod-free cavity of the active leveling cylinder through corresponding to the first bidirectional balancing valve group.

The second aspect of the embodiment of the present application provides an overhaul operation equipment, including lower revolving stage, first arm, rocking arm, last revolving stage, second arm, passive arm assembly, work platform and levelling device, levelling device includes:

the first amplitude cylinder is connected with the lower rotary table and the first arm so that the first arm can rotate around the lower rotary table;

a first leveling cylinder connecting the first arm and the rocker arm so that the rocker arm can rotate around the first arm;

in the hydraulic system of any one of the above embodiments, the active luffing cylinder is connected to the upper rotating table and the second arm, so that the second arm can rotate around the upper rotating table, the active leveling cylinder is connected to the upper rotating table and the second arm, and the passive leveling cylinder is connected to the second arm and the passive arm assembly, so that the passive arm assembly can rotate around the second arm; and

the second leveling cylinder is connected with the driven arm assembly and the working platform so that the working platform can rotate around the driven arm assembly; the passive leveling cylinder and the active leveling cylinder synchronously move, and the active leveling cylinder and the active amplitude-changing cylinder synchronously move, so that the working platform translates around the lower rotary table.

In one embodiment, the passive arm assembly comprises a third arm, a link mechanism and a leveling arm, and the leveling device further comprises a second amplitude cylinder; the passive leveling cylinder is connected with the second arm and the third arm so that the third arm can rotate around the second arm; the connecting rod mechanism is connected with the third arm and the leveling arm so that the leveling arm can translate around the third arm, the second amplitude cylinder is connected with the third arm and the connecting rod mechanism so that the connecting rod mechanism can rotate around the third arm, and the second leveling cylinder is connected with the leveling arm and the working platform so that the working platform can rotate around the leveling arm;

the first leveling cylinder and the second leveling cylinder alternatively move synchronously with the first amplitude cylinder so as to enable the working platform to translate around the lower rotary table.

A third aspect of the embodiments of the present application provides an inspection system, including:

a chassis; and

the maintenance work equipment of any one of the above aspects is mounted to the chassis.

According to the hydraulic system, when the piston rod of the driving cylinder extends out, even if all oil flowing out of the rod cavity of the driving leveling cylinder enters the rod cavity of the driven leveling cylinder, the larger the area of the oil with the same volume is, the smaller the size in the length direction is, and as the sum of the sectional areas of the rod cavities and the sum of the sectional areas of the rodless cavities of all the driven leveling cylinders are larger, the hydraulic oil with the same volume enters the rod cavity of the driven leveling cylinder from the rod cavity of the driving leveling cylinder, the expansion rate of the driven leveling cylinder is smaller than that of the driving leveling cylinder, and as the driving leveling cylinder and the driven leveling cylinder move synchronously, the expansion amount of the piston rod of the driven leveling cylinder is smaller than that of the piston rod of the driving leveling cylinder in the same time. When the piston rod of the active cylinder contracts, even if all hydraulic oil flowing out from the rodless cavity of the active leveling cylinder enters the rodless cavity of the passive leveling cylinder, the area of the hydraulic oil with the same volume is larger and the size of the hydraulic oil in the length direction is smaller as the area of the hydraulic oil with the same volume is larger, so that the hydraulic oil with the same volume enters the rodless cavity of the passive leveling cylinder from the rodless cavity of the active leveling cylinder, the expansion rate of the passive leveling cylinder is smaller than that of the active leveling cylinder, and the expansion amount of the piston rod of the passive leveling cylinder is smaller than that of the piston rod of the active leveling cylinder in the same time as the active leveling cylinder and the passive leveling cylinder synchronously move. Therefore, the passive leveling cylinder can select an oil cylinder with a smaller stroke, the stroke of the passive leveling cylinder is smaller than that of the active leveling cylinder, correspondingly, when a piston rod of the passive leveling cylinder and a piston rod of the active leveling cylinder both contract to the limit position, the total length of the passive leveling cylinder is smaller than that of the active leveling cylinder, and when the piston rod of the passive leveling cylinder and the piston rod of the active leveling cylinder both extend to the limit position, the total length of the passive leveling cylinder is smaller than that of the active leveling cylinder. The passive leveling cylinder has shorter total length and occupies less space.

Drawings

FIG. 1 is a hydraulic schematic of a hydraulic system according to an embodiment of the present disclosure;

FIG. 2 is a hydraulic schematic diagram of a leveling spill valve assembly according to an embodiment of the present application;

FIG. 3 is a hydraulic circuit diagram between an active leveling cylinder and a passive leveling cylinder according to an embodiment of the present application;

FIG. 4 is a hydraulic circuit diagram of a first bi-directional balancing valve set and a passive leveling cylinder according to an embodiment of the present application;

FIG. 5 is a hydraulic circuit diagram of a second bidirectional balancing valve block and an active luffing cylinder according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a switching valve according to an embodiment of the present application;

fig. 7 is a schematic structural view of the maintenance work equipment according to the embodiment of the present application, in which the maintenance work equipment is in a folded state, and a limited space of the maintenance work equipment is illustrated;

FIG. 8 is an assembly view of the third arm, linkage, and leveling arm of the present application in accordance with an embodiment of the present application;

FIG. 9 is an assembly view of the upper turntable, second arm, and third arm of an embodiment of the present application;

FIG. 10 is an assembly view of an active luffing cylinder, an active leveling cylinder, and a passive leveling cylinder of an embodiment of the present application;

fig. 11 is a schematic view of the maintenance operation equipment according to the embodiment of the present application in an overhead operation state;

fig. 12 is a schematic view of the maintenance work equipment according to the embodiment of the present application in a low-altitude work state.

Description of reference numerals: a hydraulic system 100; an active amplitude variation cylinder 1; an active leveling cylinder 2; a passive leveling cylinder 3; a leveling overflow valve group 4; the first oil passage 41; the second oil passage 42; a hydraulic lock 43; a first pilot operated check valve 431; a second hydraulically controlled check valve 432; a relief valve block 44; a shuttle valve 441; a relief valve 442; the first control oil passage 4421; the second control oil passage 4422; a first check valve 443; a second one-way valve 444; unloading oil channel 445 oil tank 5; a switching valve 6; a first working oil port 61; a second working oil port 62; a third working oil port 63; a fourth working oil port 64; a fifth working oil port 65; a sixth working oil port 66; a first bidirectional balancing valve group 7; the first balance valve 71; a first pilot-operated return valve 711; a third check valve 712; a second balancing valve 72; a second hydraulic-control oil return valve 721; a fourth check valve 722; a lower turn table 801; a first arm 802; a first telescopic arm 8021; a first main arm 8022; a first telescopic cylinder 8023; a rocker arm 803; an upper turntable 804; a second arm 805; a second telescoping arm 8051; a second main arm 8052; a second telescopic cylinder 8053; a third arm 806; leveling arms 807; a work platform 808; a first luffing cylinder 8091; a first leveling cylinder 8092; a linkage 810; a first link 8101; a second link 8102; a first connection 8103; a second connection 8104; a third connection 8105; a fourth connection 8106; a second leveling cylinder 811; a second luffing cylinder 812; a second bidirectional balancing valve group 9; a third balancing valve 91; a third hydraulic control spill valve 911; a fifth check valve 912; a fourth balancing valve 92; a fourth pilot-controlled oil return valve 921; a sixth check valve 912; a hoisting device 11; a passive arm assembly 200; a reference hinge point 300; a third oil passage 401; a fourth oil passage 402; a fifth oil passage 403; a sixth oil passage 404; a first angle θ 1; a second angle θ 2; a third angle θ 3; a fourth angle θ 4; length dimension D1; height dimension D2.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the description of the embodiments of the present application, "upper", "lower", "top", "bottom", orientation or positional relationship is based on the orientation or positional relationship shown in fig. 7. It is to be understood that such directional terms are merely for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present application. With reference to fig. 7, the up-down direction is the direction indicated by the arrow R1 in fig. 7.

In the description of the embodiments of the present application, with reference to fig. 7, the extending direction of the track is the direction indicated by the arrow R2 in the figure.

Before describing the embodiments of the present application, it is necessary to analyze the reasons that the inspection work equipment occupies a large space and is difficult to miniaturize in the related art, and obtain the technical solution of the embodiments of the present application through reasonable analysis.

In the related technology, the working platform can be leveled by the hydraulic leveling linkage of the active leveling cylinder and the passive leveling cylinder, namely the active leveling cylinder and the passive leveling cylinder synchronously move, so that the working platform can be always in a roughly horizontal state according to the requirement, however, in the process of synchronously moving the active leveling cylinder and the passive leveling cylinder to level the working platform, the oil in the active leveling cylinder and the oil in the passive leveling cylinder basically circulate in a roughly closed space, the oil flowing out from the active leveling cylinder can basically and completely enter the passive leveling cylinder, and the oil flowing out from the passive leveling cylinder basically and completely enters the active leveling cylinder, because in the related technology, the cylinder diameter of the active leveling cylinder is basically the same as that of the passive leveling cylinder, the rod diameter of the piston rod of the active leveling cylinder is basically the same as that of the piston rod of the passive leveling cylinder, therefore, in the leveling process of the working platform, the stretching amount of the passive leveling cylinder is basically the same as that of the active leveling cylinder, the total length of the passive leveling cylinder is basically the same as that of the active leveling cylinder, for example, the total length of the passive leveling cylinder in the limit state of contraction of the piston rod is basically the same as that of the active leveling cylinder in the limit state of contraction of the piston rod, and the total length of the passive leveling cylinder in the limit state of extension of the piston rod is basically the same as that of the active leveling cylinder in the limit state of extension of the piston rod. The total length and the stroke of the passive leveling cylinder are both longer, which correspondingly results in longer arm length of a corresponding arm for mounting the passive leveling cylinder so as to arrange a hinge point of the passive leveling cylinder, the space occupied by the maintenance operation equipment is larger, and the maintenance operation equipment is difficult to miniaturize.

In view of this, the present application provides an inspection system, which includes a chassis and an inspection work device mounted on the chassis.

It should be noted that the chassis of the embodiment of the present application is a device having a power portion capable of walking on a corresponding track or ground.

In one embodiment, the chassis includes a cab and a cargo box behind the cab, and the service work equipment is mounted in the cargo box.

It will be appreciated that the cargo box is generally open.

In one embodiment, the service operation equipment is used for servicing the track and related facilities of a tramcar such as a Yunba.

It is understood that the maintenance operation equipment is not limited to the maintenance of the baboon car and the related facilities, and can also be adapted to other maintenance objects, such as bridge maintenance, or other maintenance operations.

In one embodiment, the maintenance operation equipment can be used for high-altitude operation and low-altitude operation.

Exemplarily, when the maintenance operation equipment carries out high-altitude operation on a rail of a bus, the signal tower is mainly maintained.

Illustratively, when the maintenance operation equipment carries out low latitude operation on the rail of the Yunba car, mainly overhaul the electric control cabinet.

In one embodiment, referring to fig. 7, the maintenance operation equipment includes a lower turntable 801, a first arm 802, a swing arm 803, an upper turntable 804, a second arm 805, a passive arm assembly 200, a work platform 808, and a leveling device.

In one embodiment, the lower turntable 801 is mounted to the chassis.

Note that, when the maintenance work equipment is in the folded state, the position of the first arm 802 is the initial position. When the expected working position of the working platform 808 is a first target position, and the first target position is higher than the lower turntable 801, the maintenance working equipment performs aerial work, and when the working platform 808 is at the first target position, the corresponding first arm 802 is located at a first preset position. When the expected working position of the working platform 808 is a second target position, and the second target position is lower than the lower rotary table 801, the maintenance working equipment performs low-altitude operation, and when the working platform 808 is at the second target position, the corresponding first arm 802 is located at a second preset position. During the movement of the first arm 802 from the initial position to the first preset position, the first arm 802 remaining at the first preset position, and the movement of the first arm 802 from the first preset position to the initial position, the service-work apparatus should be understood as being in the aerial work state. During the movement of the first arm 802 from the initial position to the second preset position, the first arm 802 remaining at the second preset position, and the movement of the first arm 802 from the second preset position to the initial position, the service working apparatus should be understood as being in a low-altitude working state. The maintenance operation equipment cannot be directly switched between the high-altitude operation state and the low-altitude operation state, when the maintenance operation equipment is in the high-altitude operation state, the first arm 802 needs to move to the initial position in the high-altitude operation state and then enters the low-altitude operation state, and when the maintenance operation equipment is in the low-altitude operation state, the first arm 802 needs to move to the initial position in the low-altitude operation state and then enters the high-altitude operation state.

It should be noted that when the first arm 802 rotates upward around the lower turn table 801 by a certain angle, the maintenance operation equipment may be in an overhead operation state or a low-altitude operation state. When the first arm 802 rotates upward around the lower turntable 801 by a certain angle to move to a first preset position, the first arm 802 rotates by a certain angle to move from an initial position to the first preset position, the maintenance operation equipment is in a high-altitude operation state, when the first arm 802 rotates upward around the lower turntable by a certain angle to move to a second preset position, the first arm 802 rotates by a certain angle to move from the initial position to the second preset position, and the maintenance operation equipment is in a low-altitude operation state.

In one embodiment, the work platform 808 may be a work basket.

In one embodiment, referring to fig. 7, the leveling device may include a first luffing cylinder 8091, a first leveling cylinder 8092, a hydraulic system 100, and a second leveling cylinder 811. The first luffing cylinder 8091 connects the lower turret 801 and the first arm 802 so that the first arm 802 can rotate about the lower turret 801. A first leveling cylinder 8092 connects the first arm 802 and the swing arm 803 so that the swing arm 803 can rotate about the first arm 802. The hydraulic system 100 is used to drive the second arm 805 to rotate around the upper turntable 804 and to link the second arm 805 and the passive arm assembly 200 to level the work platform 808. A second leveling cylinder 811 couples the passive arm assembly 200 and the work platform 808 so that the work platform 808 can rotate about the passive arm assembly 200.

It should be noted that the second arm 805 is linked with the passive arm assembly 200 to level the working platform 808, which means that when the second arm 805 rotates around the upper turntable 804 by a certain angle, the passive arm assembly 200 rotates around the second arm 805 by a corresponding angle, so that the working platform 808 can always keep approximately horizontal. Facilitating the work of the operator on the work platform 808.

Referring to fig. 1, a hydraulic system 100 for overhauling working equipment according to an embodiment of the present application includes an active luffing cylinder 1, at least one active leveling cylinder 2, and at least one passive leveling cylinder 3. The rod cavity of each passive leveling cylinder 3 is selectively communicated with the rod cavity of the active leveling cylinder 2, the rodless cavity of each passive leveling cylinder 3 is selectively communicated with the rodless cavity of the active leveling cylinder 2, the sum of the sectional areas of the rod cavities of all the active leveling cylinders 2 is smaller than the sum of the sectional areas of the rod cavities of all the passive leveling cylinders 3, and the sum of the sectional areas of the rodless cavities of all the active leveling cylinders 2 is smaller than the sum of the sectional areas of the rodless cavities of all the passive leveling cylinders 3, so that the expansion and contraction speed of the passive leveling cylinders 3 is smaller than the expansion and contraction speed of the passive leveling cylinders 3; the active leveling cylinder 2 is configured to move synchronously with the active luffing cylinder 1, and the passive leveling cylinder 3 is configured to move synchronously with the active leveling cylinder 2. According to the structure, when the piston rod of the active amplitude-changing cylinder 1 extends out, even if all oil flowing out from the rod cavity of the active leveling cylinder 2 enters the rod cavity of the passive leveling cylinder 3, the larger the area of the oil with the same volume is, the smaller the size in the length direction is, as the sum of the sectional areas of the rod cavities and the sum of the sectional areas of the rodless cavities of all the passive leveling cylinders 3 are larger, the hydraulic oil with the same volume enters the rod cavity of the passive leveling cylinder 3 from the rod cavity of the active leveling cylinder 2, the expansion rate of the passive leveling cylinder 3 is smaller than that of the active leveling cylinder 2, and as the active leveling cylinder 2 and the passive leveling cylinder 3 synchronously move, the expansion amount of the piston rod of the passive leveling cylinder 3 in the same time is smaller than that of the piston rod of the active leveling cylinder 2. When the piston rod of the active amplitude cylinder 1 contracts, even if all hydraulic oil flowing out of the rodless cavity of the active leveling cylinder 2 enters the rodless cavity of the passive leveling cylinder 3, the area of the hydraulic oil is larger than that of the rodless cavity of the passive leveling cylinder 3, and the size in the length direction is smaller when the area of the hydraulic oil is larger, so that the hydraulic oil with the same volume enters the rodless cavity of the passive leveling cylinder 3 from the rodless cavity of the active leveling cylinder 2, the expansion rate of the passive leveling cylinder 3 is smaller than that of the active leveling cylinder 2, and the expansion amount of the piston rod of the passive leveling cylinder 3 is smaller than that of the piston rod of the active leveling cylinder 2 in the same time due to synchronous movement of the active leveling cylinder 2 and the passive leveling cylinder 3. Therefore, the passive leveling cylinder 3 can select an oil cylinder with a smaller stroke, the stroke of the passive leveling cylinder 3 is smaller than that of the active leveling cylinder 2, correspondingly, when the piston rod of the passive leveling cylinder 3 and the piston rod of the active leveling cylinder 2 both contract to the limit position, the total length of the passive leveling cylinder 3 is smaller than that of the active leveling cylinder 2, and when the piston rod of the passive leveling cylinder 3 and the piston rod of the active leveling cylinder 2 both extend to the limit position, the total length of the passive leveling cylinder 3 is smaller than that of the active leveling cylinder 2. The passive leveling cylinder 3 has a short overall length and occupies a small space.

It should be noted that the synchronous movement between the two means that when one of the two moves, the other moves, and when one of the two stops moving, the other stops moving. For the telescopic action of each cylinder, when one cylinder extends, the other cylinder extends or contracts, the two cylinders can be considered to move synchronously. When one of the cylinders contracts, the other cylinder extends or contracts, and the two cylinders can be considered to move synchronously. When one of the two cylinders extends or contracts, the other cylinder does not extend or contract, and the two cylinders do not move synchronously.

Illustratively, the active amplitude cylinder 1 and the active leveling cylinder 2 move synchronously, when the active amplitude cylinder 1 extends, the active leveling cylinder 2 correspondingly extends, when the active amplitude cylinder 1 contracts, the active leveling cylinder 2 correspondingly contracts, when the active amplitude cylinder 1 stops extending, the active leveling cylinder 2 correspondingly stops extending, when the active leveling cylinder 2 extends, the passive leveling cylinder 3 correspondingly contracts, when the active leveling cylinder 2 contracts, the passive leveling cylinder 3 correspondingly extends, and when the active leveling cylinder 2 stops extending, the passive leveling cylinder 3 correspondingly stops extending. The stretching action of the active amplitude cylinder 1 and the stretching action of the active leveling cylinder 2 are almost simultaneously carried out, and the stretching action of the passive leveling cylinder 3 and the stretching action of the active leveling cylinder 2 are almost simultaneously carried out.

The stroke is a difference between a total length of the piston rod of the oil cylinder extending to the limit position and a total length of the piston rod of the oil cylinder retracting to the limit position.

Illustratively, the stroke of the active leveling cylinder 2 is the difference between the total length of the piston rod of the active leveling cylinder 2 extending to the extreme position and the total length of the piston rod of the active leveling cylinder 2 retracting to the extreme position. The stroke of the passive leveling cylinder 3 is the difference between the total length of the piston rod of the passive leveling cylinder 3 extending to the limit position and the total length of the piston rod of the active leveling cylinder 2 retracting to the limit position.

In one embodiment, the plane perpendicular to the piston rod may be a cross section, and the sectional area of the rod chamber is an area of a projection area formed by projection of the rod chamber to the cross section.

In one embodiment, referring to fig. 7, 9 and 10, the active luffing cylinder 1 connects the upper rotating table 804 and the second arm 805 so that the second arm 805 can rotate around the upper rotating table 804, the active leveling cylinder 2 connects the upper rotating table 804 and the second arm 805, and the passive leveling cylinder 3 connects the second arm 805 and the passive arm assembly 200 so that the passive arm assembly 200 can rotate around the second arm 805. The passive leveling cylinder 3 and the active leveling cylinder 2 synchronously move, and the active leveling cylinder 2 and the active amplitude-changing cylinder 1 synchronously move, so that the working platform 808 translates around the lower turntable 801. According to the structure, the passive leveling cylinder 3 and the active leveling cylinder 2 synchronously move, the active leveling cylinder 2 and the active amplitude-changing cylinder 1 synchronously move, other oil cylinders do not move in the process of maintenance operation equipment movement, the active amplitude-changing cylinder 1 drives the second arm 805 to rotate around the upper rotary table 804, the active leveling cylinder 2 synchronously moves along with the active amplitude-changing cylinder 1 under the driving of the upper rotary table 804 and the second arm 805, the passive leveling cylinder 3 synchronously moves along with the active leveling cylinder 2 to drive the passive arm assembly 200 to rotate around the second arm 805, the second arm 805 and the passive arm assembly 200 are linked to level the working platform 808, the working platform 808 is always in a roughly horizontal state, and maintenance operation is facilitated for operators. On one hand, the working platform 808 is basically kept horizontal through the synchronous motion of the active leveling cylinder 2 and the passive leveling cylinder 3, on the other hand, the passive leveling cylinder 3 can select a smaller stroke, the total length of the passive leveling cylinder 3 can be shortened to a certain extent, the hinge point position of the passive leveling cylinder 3 and the passive arm assembly 200 is closer to the hinge point position of the passive arm assembly 200 and the first arm 802, the length of the passive arm assembly 200 can be shortened according to actual needs, and the miniaturization of maintenance operation equipment is facilitated.

It will be appreciated that when the active luffing cylinder 1 drives the second arm 805 to rotate around the upper turntable 804 by a certain angle, the passive leveling cylinder 3 follows the active leveling cylinder 2 to drive the passive arm assembly 200 to rotate around the second arm 805 by an angle substantially equal to the angle of rotation of the second arm 805 around the upper turntable 804, so that the working platform 808 is kept substantially horizontal.

It will be appreciated that when the service work apparatus is in the collapsed condition, the service work apparatus does not service the track and associated facilities. When the service working equipment is in the folded state, the height dimension D2 of the service working equipment and the length dimension D1 along the service working equipment are limited, and the service working equipment is arranged in a limited space.

In one embodiment, when the chassis of the maintenance system travels on a rail, in the folded state, the length direction of the maintenance operation equipment is along the extension direction of the rail, and the width direction of the maintenance operation equipment is approximately perpendicular to the extension direction of the rail.

In one embodiment, fig. 7 shows the maintenance work equipment folded, and when the maintenance work equipment is folded, the lower turntable 801 and the working platform 808 are arranged along the extending direction of the rail.

In one embodiment, when the service work apparatus is in a collapsed state, the work platform 808 remains substantially horizontal.

It can be understood that, referring to fig. 7, the car of the yunba is usually shuttled in urban areas, there may be buildings on both sides of the track where the car of the yunba is located, and the maintenance operation equipment cannot extend out of both sides of the track too long.

It will be appreciated with reference to figures 7 and 11 that during aerial work the first arm 802 needs to be rotated upwardly about the lower turntable 801 at an angle to enable the work platform 808 to reach the desired height. Referring to fig. 7 and 12, during low-altitude operation, the first arm 802 needs to rotate downward around the lower turntable 801 by a certain angle, and even needs to be partially tilted downward by a certain angle by the passive arm assembly 200, so that the working platform 808 can reach a desired depth. Referring to fig. 11 and 12, an upward rotation angle of the first arm 802 during the high altitude operation is a first angle θ 1, a downward rotation angle of the first arm 802 during the low altitude operation is a second angle θ 2, a downward inclination angle of the driven arm assembly 200 is a third angle θ 3, and a rotation angle of the working platform 808 around the driven arm assembly 200 is a fourth angle θ 4. When the first angle θ 1, the second angle θ 2, and the third angle θ 3 are all rotated by the working platform 808 around the passive arm assembly 200 by a corresponding fourth angle θ 4 to achieve the purpose of always keeping the working platform 808 substantially horizontal, the range of the fourth angle θ 4 of the working platform 808 around the passive arm assembly 200 is large, and the stroke and the total length of the second leveling cylinder 811 are long. It is difficult to arrange the longer second leveling cylinder 811 in a limited space for achieving such a wide range of angular rotation of the fourth angle θ 4 between the work platform 808 and the passive arm assembly 200 to ensure that the work platform 808 is at a desired height for high-altitude work and at a desired depth for low-altitude work, and that the work platform 808 remains substantially level.

In view of this, in one embodiment, referring to fig. 7, 11 and 12, the passive arm assembly 200 includes a third arm 806, a linkage 810, and a leveling arm 807, and the leveling device further includes a second luffing cylinder 812. The passive leveling cylinder 3 connects the second arm 805 and the third arm 806 so that the third arm 806 can rotate about the second arm 805. A linkage 810 connects the third arm 806 and the leveling arm 807 to enable the leveling arm 807 to translate about the third arm 806, and a second luffing cylinder 812 connects the third arm 806 and the linkage 810 to enable the linkage 810 to rotate about the third arm 806. A second leveling cylinder 811 connects the leveling arm 807 and the work platform 808 so that the work platform 808 can rotate about the leveling arm 807. Wherein the first leveling cylinder 8092 and the second leveling cylinder 811 alternatively move synchronously with the first luffing cylinder 8091 to translate the work platform 808 about the lower turntable 801. In such a structure, since the first leveling cylinder 8092 and the second leveling cylinder 811 alternatively move synchronously with the first luffing cylinder 8091 to translate the working platform 808 around the lower turntable 801, the second leveling cylinder 811 and the first luffing cylinder 8091 can move synchronously to translate the working platform 808 around the lower turntable 801 during the maintenance operation equipment is in high-altitude operation. During the low-altitude operation of the maintenance operation equipment, the first leveling cylinder 8092 and the first luffing cylinder 8091 synchronously move to enable the working platform 808 to translate around the lower rotary table 801, the first luffing cylinder 8091 drives the first arm 802 to rotate downwards around the lower rotary table 801 by a second angle theta 2 in the low-altitude operation process, the first leveling cylinder 8092 drives the rocker arm 803 to correspondingly level, so that the working platform translates around the lower rotary table 801, and the second angle theta 2 of the rotation of the first arm 802 does not need the second leveling cylinder 811 to level. The link mechanism 810 can be bent downwards to improve the downward detection depth of the working platform 808 in a low-altitude operation state, namely the driven arm assembly 200 is partially inclined downwards, which is beneficial to the working platform 808 to reach the expected depth in the low-altitude operation state, the downward bending angle of the link mechanism 810 is the third angle theta 3 of the driven arm assembly 200 partially inclined towards one direction, the connecting mechanism enables the leveling arm 807 to translate around the third arm 806, the link mechanism 810 has a leveling function, and the third angle theta 3 of the link mechanism 810 bent downwards does not need to be leveled through the second leveling cylinder 811. In this way, the second leveling cylinder 811 only needs to level the first angle θ 1 by which the first arm 802 of the maintenance operation equipment rotates in the high-altitude operation state, so that the range of the fourth angle θ 4 which needs to rotate is reduced, the stroke and the total length of the second leveling cylinder 811 are reduced, when the first arm 802 rotates upwards by the first angle θ 1, the working platform 808 reaches the expected height in the high-altitude operation state, and the fourth angle θ 4 by which the second leveling cylinder 811 drives the working platform 808 to rotate around the leveling arm 807 can still be realized in the condition of limited space. Furthermore, since the range of the fourth angle θ 4 required to rotate is reduced, the stroke and the total length of the second leveling cylinder 811 are reduced, and the length of the leveling arm 807 is reduced to a certain extent, since the passive leveling cylinder 3 connects the second arm 805 and the third arm 806, and the stroke and the total length of the passive leveling cylinder 3 are reduced, and the length of the third arm 806 is reduced to a certain extent, when the total length of the passive arm assembly 200 is not changed, that is, the sum of the length of the third arm 806, the length of the link mechanism 810, and the length of the leveling arm 807 is not changed, since the lengths of the third arm 806 and the leveling arm 807 are reduced, the length of the link mechanism 810 can be increased, the probing depth of the working platform 808 in the low-altitude working state can be increased, and the working platform 808 can reach the desired depth in the low-altitude working state in a limited space. Therefore, through the associated leveling under different conditions and the combination of the leveling structures of the active leveling cylinder 2 and the passive leveling cylinder 3, the range of the fourth angle θ 4 required to rotate is reduced, so that the arm lengths among the third arm 806, the link mechanism 810 and the leveling arm 807 can be correspondingly increased or decreased, and therefore, under the condition of limited space, the working platform 808 can reach the expected height under the high-altitude working state, and the working platform 808 can reach the expected depth under the low-altitude working state.

It is to be understood that the first leveling cylinder 8092 and the second leveling cylinder 811 alternatively move in synchronization with the first luffing cylinder 8091, that is, when the first leveling cylinder 8092 moves in synchronization with the first luffing cylinder 8091, the second leveling cylinder 811 does not move in synchronization with the first luffing cylinder 8091, the second leveling cylinder 811 is in a locked state, the second leveling cylinder 811 does not extend or retract, when the second leveling cylinder 811 moves in synchronization with the first luffing cylinder 8091, the first leveling cylinder 8092 does not move in synchronization with the first luffing cylinder 8091, the first leveling cylinder 8092 is in a locked state, and the first leveling cylinder 8092 does not extend or retract.

It will be appreciated that in a low altitude operating condition, when the first luffing cylinder 8091 drives the first arm 802 to rotate downward about the lower turret 801 by a second angle θ 2, the first leveling cylinder 8092 drives the swing arm 803 to rotate downward about the first arm 802 by an angle substantially equal to the second angle θ 2, so that the work platform 808 remains substantially horizontal. In an overhead working state, when the first luffing cylinder 8091 drives the first arm 802 to rotate upwards by a first angle theta 1 around the lower rotary table 801, the second leveling cylinder 811 drives the working platform 808 to rotate by a fourth angle theta 4 around the leveling arm 807, and the first angle theta 1 and the fourth angle theta 4 are substantially equal to each other, so that the working platform 808 is substantially horizontal.

It will be appreciated that in some embodiments, the height of the working platform 808 is required to be small from the centre of rotation of the lower turntable 801, and the first angle θ 1 at which the first arm 802 rotates about a turntable 801 should be as large as possible, if allowed. In one embodiment, the first angle θ 1 may be 68 °.

In one embodiment, when the first luffing cylinder 8091 drives the first arm 802 to rotate upwards by a certain angle around the lower turntable 801, and the purpose of the upward rotation of the first arm 802 is to move to a second preset position, and the maintenance operation equipment is in a low-altitude operation state, the first luffing cylinder 8091 and the first leveling cylinder 8092 move synchronously, so that the working platform 808 translates around the lower turntable 801, and the second leveling cylinder 811 is locked.

In one embodiment, when the first leveling cylinder 8092 moves synchronously with the first luffing cylinder 8091, the first luffing cylinder 8091 extends, the first leveling cylinder 8092 contracts, and when the first luffing cylinder 8091 contracts, the first leveling cylinder 8092 extends. When the second leveling cylinder 811 moves synchronously with the first luffing cylinder 8091, the first luffing cylinder 8091 extends out, the second leveling cylinder 811 extends out, and when the first luffing cylinder 8091 contracts, the second leveling cylinder 811 contracts.

In one embodiment, referring to fig. 7, the lower turntable 801, the first arm 802 and the swing arm 803 are sequentially hinged, the upper turntable 804 is rotatably connected to the swing arm 803 so that the upper turntable 804 can rotate around the swing arm 803, and the upper turntable 804, the second arm 805, the third arm 806, the link mechanism 810, the leveling arm 807 and the working platform 808 are sequentially hinged. In the folded state, the first arm 802, the rocker arm 803, the upper turntable 804, the second arm 805, and the third arm 806 are folded in a Z-shape, the link mechanism 810 is bent downward at a third angle θ 3 from the horizontal direction, the third angle θ 3 is a preset angle, and the leveling arm 807 is extended along the link mechanism 810 in a direction away from the third arm 806. With such a structure, in a folded state, the working platform 808 and the leveling arm 807 can be retracted towards the lower rotary table 801 as much as possible, and the dimension of the maintenance operation equipment along the arrangement direction of the lower rotary table 801 and the working platform 808 is reduced so as to adapt to a limited space along the extending direction of the track. During the high-altitude operation, the second luffing cylinder 812 can be driven to enable the third arm 806, the link mechanism 810 and the leveling arm 807 to be almost positioned on a straight line, so that the leveling arm 807 is lifted as much as possible, which is beneficial to increasing the height of the working platform 808.

In one embodiment, referring to fig. 7, the rotation center line of the lower turntable 801 is substantially extended in the up-down direction.

In one embodiment, the lower turntable 801 is mounted to and swivels about the chassis.

In an embodiment, referring to fig. 7, when the maintenance operation equipment is in a folded state, the upper turntable 804 is disposed to extend substantially in the up-down direction around the rotation center line of the swing arm 803.

In one embodiment, referring to fig. 7 and 11, the working platform 808 is hinged to the end of the leveling arm 807 away from the link mechanism 810, the hinge point of the working platform 808 and the leveling arm 807 is the reference hinge point 300, when the service work equipment is in the folded state, the second leveling cylinder 811 is located on the side of the reference hinge point 300 facing the link mechanism 810, and the reference hinge point 300 is located on the end of the leveling arm 807 away from the link mechanism 810. According to the structure, during the high-altitude operation, when the first amplitude cylinder 8091 drives the first arm 802 to rotate around the lower rotary table 801, the second leveling cylinder 811 drives the working platform 808 to rotate around the leveling arm 807 so as to enable the working platform 808 to be basically horizontal, and the hinge point of the working platform 808, which is hinged with the second leveling cylinder 811, is gradually raised, which is beneficial to increasing the height of the working platform 808.

In an embodiment, referring to fig. 7, the first arm 802 includes a first main arm 8022, a first telescopic arm 8021 and a first telescopic cylinder 8023, and the first telescopic arm 8021 is located in the first main arm 8022 and drives the first telescopic arm 8021 to extend and retract through the first telescopic cylinder 8023. The lower rotary table 801 is hinged with the first main arm 8022, the first luffing cylinder 8091 is hinged with the first main arm 8022, the first leveling cylinder 8092 is hinged with the first main arm 8022, and the rocker 803 is hinged with the first main arm 8022. The service work apparatus further comprises a lifting device 11 connected to the end of the first telescopic arm 8021. And the projection is carried out along the vertical direction, and the projection area of the hoisting device 11 is staggered with the projection area of the working platform 808. In such a structure, the lifting device 11 can be used for lifting, and in a lifting operation state, an operator does not enter the working platform 808 for operation, and can not keep the working platform 808 approximately horizontal, the working platform 808 can be inclined, and the first telescopic arm 8021 can be telescopic to increase the lifting height.

In one embodiment, during the lifting operation of the lifting device, the first leveling cylinder 8092, the active luffing cylinder 1, the active leveling cylinder 2, the passive leveling cylinder 3, the second luffing cylinder 812, and the second leveling cylinder 811 may not perform telescopic motion and are in a locked state. The first luffing cylinder 8091 drives the first boom 802 to rotate upward around the lower turntable 801 to raise the lifting device 11.

In an embodiment, referring to fig. 7 and 9, the second arm 805 includes a second main arm 8052, a second telescopic arm 8051 and a second telescopic cylinder 8053, the second telescopic arm 8051 is located in the second main arm 8052, and the second telescopic cylinder 8053 drives the second telescopic arm 8051 to extend and retract. The upper rotating platform 804 is hinged with the second main arm 8052, the active amplitude cylinder 1 is hinged with the second main arm 8052, the active leveling cylinder 2 is hinged with the second main arm 8052, the third arm 806 is hinged with the second telescopic arm 8051, and the passive leveling cylinder 3 is hinged with the second telescopic arm 8051. With such a structure, the extension of the second telescopic arm 8051 can increase the downward detection depth of the maintenance operation equipment in the low-altitude operation state, and is beneficial to enabling the working platform 808 to reach the expected depth in the low-altitude operation state.

In one embodiment, referring to fig. 8, linkage 810 includes a first link 8101 and a second link 8102.

In one embodiment, the second horn 812 is hingedly connected to the first link 8101.

In one embodiment, the second luffing cylinder 812 is articulated to the second connecting rod 8102.

In one embodiment, referring to fig. 8, a first connection line 8103 is formed between a hinge point of the first connection rod 8101 and the third arm 806 and a hinge point of the first connection rod 8101 and the leveling arm 807, a second connection line 8104 is formed between a hinge point of the first connection rod 8101 and the leveling arm 807 and a hinge point of the second connection rod 8102 and the leveling arm 807, a third connection line 8105 is formed between a hinge point of the second connection rod 8102 and the leveling arm 807 and a hinge point of the second connection rod 8102 and the third arm 806, a fourth connection line is formed between a hinge point of the second connection rod 8102 and the third arm 806 and a hinge point of the first connection rod 8101 and the third arm 806, and the first connection line 8103, the second connection line 8104, the third connection line 8105 and the fourth connection line enclose a parallelogram. In this structure, the substantially parallelogram structure formed by the third arm 806, the first link 8101, the second link 8102 and the leveling arm 807 can make the leveling arm 807 translate around the third arm 806, so that the link mechanism 810 has a leveling function.

In one embodiment, the first link 8101 may be provided but the second link 8102 may not be provided, and the leveling device may further include a leveling cylinder corresponding to the second luffing cylinder 812, the leveling cylinder corresponding to the second luffing cylinder 812 is respectively hinged to the first link 8101 and the leveling arm 807, and when the second luffing cylinder 812 drives the first link 8101 to rotate around the third arm 806, the leveling cylinder corresponding to the second luffing cylinder 812 drives the leveling arm 807 to rotate around the first link 8101, so that the leveling arm 807 translates around the third arm 806.

In one embodiment, the second connecting rod 8102 may be provided but the first connecting rod 8101 is not provided, the leveling device may further include a leveling cylinder corresponding to the second luffing cylinder 812, the leveling cylinder corresponding to the second luffing cylinder 812 is respectively hinged to the second connecting rod 8102 and the leveling arm 807, when the second luffing cylinder 812 drives the second connecting rod 8102 to rotate around the third arm 806, and the leveling cylinder corresponding to the second luffing cylinder 812 drives the leveling arm 807 to rotate around the second connecting rod 8102, so that the leveling arm 807 translates around the third arm 806.

In an embodiment, referring to fig. 1, 7, 9 and 10, the number of the passive leveling cylinders 3 is multiple, and the specifications of the passive leveling cylinders 3 are consistent. Due to the structural form, due to the fact that the specifications of the passive leveling cylinders 3 are consistent, the corresponding hinge point positions of the passive leveling cylinders 3 can be approximately the same, and the projection areas of the two passive leveling cylinders 3 are basically the same along the central axis direction of the third arm 806 rotating around the second arm 805, so that the installation of the passive leveling cylinders 3 is consistent, and the installation of the passive leveling cylinders 3 is simplified.

The specifications of the passive leveling cylinders 3 are the same, which means that the cylinder diameters of the passive leveling cylinders 3 are the same, the rod diameters of the passive leveling cylinders 3 are the same, and the strokes of the passive leveling cylinders 3 are the same. When the piston rod of each passive leveling cylinder 3 is at the contraction limit position, the total length of each passive leveling cylinder 3 is the same. When the piston rod of each passive leveling cylinder 3 is at the extension limit position, the total length of each passive leveling cylinder 3 is the same.

In one embodiment, referring to fig. 1, 7, 9 and 10, the number of the active leveling cylinders 2 is one, the number of the passive leveling cylinders 3 is two, the diameters of the active leveling cylinders 2 and the passive leveling cylinders 3 are the same, the rod diameters of the active leveling cylinders 2 and the passive leveling cylinders 3 are the same, and the stroke of the active leveling cylinders 2 is twice that of the passive leveling cylinders 3. In such a structure, since the stroke of the active leveling cylinder 2 is twice that of the passive leveling cylinder 3, the stroke of the passive leveling cylinder 3 is relatively small, the total length of the passive leveling cylinder 3 in the piston rod contraction limit state can be approximately half of the total length of the active leveling cylinder 2 in the piston rod contraction limit state, and the total length of the passive leveling cylinder 3 in the piston rod extension limit state can be approximately half of the total length of the active leveling cylinder 2 in the piston rod extension limit state, so that the length of the third arm 806 hinged to the passive cylinder can be shortened to an expected length.

In one embodiment, the total length of the passive leveling cylinder 3 in the piston rod contraction limit state may be half of the total length of the active leveling cylinder 2 in the piston rod contraction limit state, and the total length of the passive leveling cylinder 3 in the piston rod extension limit state may be half of the total length of the active leveling cylinder 2 in the piston rod extension limit state.

In one embodiment, the total length of the passive leveling cylinder 3 in the piston rod contraction limit state may be slightly greater than or less than half of the total length of the active leveling cylinder 2 in the piston rod contraction limit state, and the total length of the passive leveling cylinder 3 in the piston rod extension limit state may be slightly greater than or less than half of the total length of the active leveling cylinder 2 in the piston rod extension limit state.

The piston rod contraction limit position is a state in which the piston rod is contracted to a limit position, and the piston rod extension limit state is a state in which the piston rod is extended to a limit position.

In one embodiment, referring to fig. 1 and 2, the hydraulic system 100 includes a leveling overflow valve set 4 and an oil tank 5, and when the rod chamber or the rodless chamber of the active leveling cylinder 2 is overloaded, both the rod chamber and the rodless chamber of the active leveling cylinder 2 communicate with the oil tank 5 through the leveling overflow valve set 4 to relieve the pressure of the active leveling cylinder 2. When the active leveling cylinder 2 is not overloaded and the leveling overflow valve bank 4 does not supply oil to the active leveling cylinder 2, the leveling overflow valve bank 4 is configured to prevent hydraulic oil in the active leveling cylinder 2 from flowing out through the leveling overflow valve bank 4. According to the structure, on one hand, the leveling overflow valve group 4 is used for releasing pressure of the active leveling cylinder 2, so that the active leveling cylinder 2 is prevented from being continuously overloaded and the active leveling cylinder 2 and the passive leveling cylinder 3 are prevented from being damaged. On the other hand, the leveling overflow valve group 4 can prevent hydraulic oil in the active leveling cylinder 2 from flowing out through the leveling overflow valve group 4, when the active leveling cylinder 2 is not overloaded and the leveling overflow valve group 4 is not supplying oil to the active leveling cylinder 2, oil in the active leveling cylinder 2 and oil in the passive leveling cylinder 3 are blocked in a relatively closed space by the leveling overflow valve group 4, the oil flowing out of the active leveling cylinder 2 can basically and completely enter the passive leveling cylinder 3, the oil flowing out of the passive leveling cylinder 3 can basically and completely enter the active leveling cylinder 2, the ratio of the expansion rate of the passive leveling cylinder 3 to the expansion rate of the active leveling cylinder 2 is basically a preset ratio, and the ratio of the stroke of the passive leveling cylinder 3 to the stroke of the active leveling cylinder 2 is basically a preset ratio.

It will be appreciated that the predetermined ratio is substantially the ratio of the sum of the areas of the rodless chambers of all active levelling cylinders 2 to the sum of the areas of the rodless chambers of all passive levelling cylinders 3. Alternatively, the preset ratio is substantially the ratio of the sum of the areas of the rod chambers of all the active leveling cylinders 2 to the sum of the areas of the rod chambers of all the passive leveling cylinders 3.

In one embodiment, the number of the active leveling cylinders 2 is one, the number of the passive leveling cylinders 3 is two, the area of the rodless cavity of the active leveling cylinder 2 is a, the area of the rodless cavity of the passive leveling cylinder 3 is 2A, and the preset ratio is 1: 2. in another embodiment, the number of the active leveling cylinders 2 is one, the number of the passive leveling cylinders 3 is two, the area of the rod cavity of the active leveling cylinder 2 is B, the area of the rod cavity of the passive leveling cylinder 3 is 2B, and the preset ratio is 1: 2.

pressure relief means that the pressure in the respective chambers is adjusted to a state in which the respective chambers are not overloaded, for example, an excessively high pressure is adjusted to be low.

In one embodiment, referring to fig. 1 and 2, the leveling overflow valve set 4 includes a first oil path 41, a second oil path 42, a hydraulic lock 43, and an unloading valve set 44, wherein one end of the first oil path 41 is communicated with the hydraulic lock 43, the other end of the first oil path 41 is communicated with the rod chamber of the active leveling cylinder 2, one end of the second oil path 42 is communicated with the hydraulic lock 43, the other end of the second oil path 42 is communicated with the rodless chamber of the active leveling cylinder 2, the unloading valve set 44 is connected between the first oil path 41 and the second oil path 42, when the hydraulic lock 43 does not supply oil to the active leveling cylinder 2, the hydraulic lock 43 is configured to prevent the hydraulic oil in the active leveling cylinder 2 from flowing out through the hydraulic lock 43, and when the active leveling cylinder 2 is overloaded, the rod chamber and the rodless chamber of the active leveling cylinder 2 are both communicated with the oil tank 5 through the unloading valve set 44 to enable the active leveling cylinder 2. When the active leveling cylinder 2 is not overloaded, the rod cavity and the rodless cavity of the active leveling cylinder 2 are both stopped from the oil tank 5 through the unloading valve bank 44. In such a structure, as the rod cavity of the active leveling cylinder 2 is selectively communicated with the rod cavity of the passive leveling cylinder 3, and the rodless cavity of the active leveling cylinder 2 is selectively communicated with the rodless cavity of the passive leveling cylinder 3, oil can be fed into the rod cavity or the rodless cavity of the active leveling cylinder 2 through the hydraulic lock 43, so that the rod cavity and the rodless cavity of the active leveling cylinder 2 and the rod cavity and the rodless cavity of the passive leveling cylinder 3 can be filled with hydraulic oil. After the active leveling cylinder 2 and the passive leveling cylinder 3 are filled with oil, the hydraulic lock 43 cuts off the first oil path 41 and the second oil path 42 to prevent the hydraulic oil in the active leveling cylinder 2 from flowing out through the hydraulic lock 43, that is, the hydraulic lock 43 prevents the active leveling cylinder 2 from returning oil through the hydraulic lock 43. Therefore, when the hydraulic lock 43 prevents the active leveling cylinder 2 from returning oil through the hydraulic lock 43, the rod cavity and the rodless cavity of the active leveling cylinder 2 are both blocked from the oil tank 5 through the unloading valve bank 44, and the hydraulic oil in the active leveling cylinder 2 and the passive leveling cylinder 3 is blocked in a relatively closed space through the hydraulic lock 43 and the unloading valve bank 44.

It should be noted that the hydraulic lock 43 usually has two oil outlets and two control ports, and one of the two control ports feeds oil and the other control port returns oil.

In an embodiment, referring to fig. 2, the hydraulic lock 43 includes a first hydraulic control check valve 431 and a second hydraulic control check valve 432, an oil inlet of the first hydraulic control check valve 431 is communicated with a control oil port of the second hydraulic control check valve 432, an oil inlet of the second hydraulic control check valve 432 is communicated with the control oil port of the first hydraulic control check valve 431, one end of the first oil path 41 is communicated with an oil outlet of the first hydraulic control check valve 431, and one end of the second oil path 42 is communicated with an oil outlet of the second hydraulic control check valve 432.

In an embodiment, referring to fig. 1 and fig. 2, the unloading valve group 44 includes a shuttle valve 441, an overflow valve 442, a first check valve 443, a second check valve 444, and an unloading oil path 445, one oil inlet of the shuttle valve 441 is communicated with the first oil path 41, the other oil inlet of the shuttle valve 441 is communicated with the second oil path 42, one end of the unloading oil path 445 is communicated with the oil outlet of the shuttle valve 441, the other end of the unloading oil path 445 is communicated with the oil tank 5, the overflow valve 442 is connected in series to the unloading oil path 445, the oil inlet side of the first check valve 443 is communicated with the unloading oil path 445 downstream of the overflow valve 442, the oil outlet side of the first check valve 443 is communicated with the first oil path 41, the oil inlet side of the second check valve 444 is communicated with the unloading oil path 445 downstream of the overflow valve 442, and the oil outlet side of the second check valve 444 is communicated with the second oil path 42. With such a structure, when the active leveling cylinder 2 is overloaded, the pressure of the rod cavity of the active leveling cylinder 2 is too high, the hydraulic oil in the rod cavity of the active leveling cylinder 2 overflows through the first oil path 41, the shuttle valve 441 and the overflow valve 442, so that the pressure of the rod cavity of the active leveling cylinder 2 is relieved, the hydraulic oil of the rod cavity of the active leveling cylinder 2 flows out through the overflow valve 442 and does not enter the rod cavity of the passive leveling cylinder 3, or the oil quantity entering the rod cavity of the passive leveling cylinder 3 is less, the piston rod of the passive leveling cylinder 3 does not form corresponding expansion quantity, a certain negative pressure can appear in the rodless cavity of the active leveling cylinder 2, the hydraulic oil overflowing from the rod cavity of the active leveling cylinder 2 through the overflow valve 442 enters the rodless cavity of the active leveling cylinder 2 through the second check valve 444 and the second oil path 42, so as to replenish oil to the rodless cavity of the active leveling cylinder 2, even the oil in the oil tank 5 can be replenished to the rodless cavity of the active leveling cylinder 2 through the unloading oil passage 445, the second check valve 444, and the second oil passage 42. When the active leveling cylinder 2 is overloaded, the pressure of the rodless cavity of the active leveling cylinder 2 is too high, the hydraulic oil in the rodless cavity of the active leveling cylinder 2 overflows through the second oil path 42, the shuttle valve 441 and the overflow valve 442, so that the pressure of the rodless cavity of the active leveling cylinder 2 is relieved, the hydraulic oil of the rodless cavity of the active leveling cylinder 2 flows out through the overflow valve 442 and does not enter the rodless cavity of the passive leveling cylinder 3, or the oil quantity entering the rodless cavity of the passive leveling cylinder 3 is less, the piston rod of the passive leveling cylinder 3 does not form corresponding expansion and contraction quantity, a certain negative pressure can appear in the rod cavity of the active leveling cylinder 2, the hydraulic oil overflowing from the rodless cavity of the active leveling cylinder 2 through the overflow valve 442 enters the rod cavity of the active leveling cylinder 2 through the first check valve 443 and the first oil path 41, so as to replenish oil to the rod chamber of the active leveling cylinder 2, even the oil in the oil tank 5 can be replenished to the rod chamber of the active leveling cylinder 2 through the unloading oil passage 445, the first check valve 443, and the first oil passage 41. Therefore, pressure relief of the active leveling cylinder 2 is achieved by the shuttle valve 441, the relief valve 442, the first check valve 443, and the second check valve 444.

In one embodiment, referring to fig. 2, the overflow valve 442 has a first control oil path 4421 and a second control oil path 4422, one end of the first control oil path 4421 is communicated with an oil inlet of the overflow valve 442, the other end of the first control oil path 4421 is communicated with one of the control oil ports of the overflow valve 442, one end of the second control oil path 4422 is communicated with an oil outlet of the overflow valve 442, and the other end of the second control oil path 4422 is communicated with the other control oil port of the overflow valve 442.

It can be understood that the piston and the cylinder are in dynamic seal, and the piston rod and the cylinder are in dynamic seal, however, the dynamic seal is difficult to achieve complete seal, and hydraulic oil may leak out of the cylinder from between the piston rod and the cylinder, or a part of hydraulic oil in the rod-containing space leaks to the rodless cavity through between the piston and the cylinder, or a part of hydraulic oil in the rodless cavity leaks to the rod-containing cavity through between the piston and the cylinder. Therefore, the rod chamber of the active leveling cylinder 2 and the rod chamber of the passive leveling cylinder 3, and the rod-less chamber of the active leveling cylinder 2 and the rod-less chamber of the passive leveling cylinder 3 are not absolute sealed spaces, there is a hydraulic oil leakage, and after a period of use, even if the active leveling cylinder 2 is not overloaded, the rod chamber or the rod-less chamber of the active leveling cylinder 2 will form a negative pressure, and the rod chamber or the rod-less chamber of the active leveling cylinder 2 needs to be replenished with oil. When the rod cavity of the active leveling cylinder 2 forms negative pressure, the rod cavity of the active leveling cylinder 2 needs oil supplement, and oil in the oil tank 5 is supplemented to the rod cavity of the active leveling cylinder 2 through the unloading oil path 445, the first check valve 443 and the first oil path 41. When the rodless cavity of the active leveling cylinder 2 forms negative pressure, the rodless cavity of the active leveling cylinder 2 needs oil supplement, and oil in the oil tank 5 is supplemented to the rodless cavity of the active leveling cylinder 2 through the unloading oil way 445, the second check valve 444 and the second oil way 42.

In one embodiment, referring to fig. 1 and 6, the hydraulic control system further includes a switching valve 6 and an oil source, and the oil source supplies oil to the active amplitude cylinder 1 and the active leveling cylinder 2 alternatively through the switching valve 6. According to the structure, when the active leveling cylinder 2 and the passive leveling cylinder 3 work for the first time, hydraulic oil needs to be introduced into the active leveling cylinder 2 and the passive leveling cylinder 3, switching can be performed through the switching valve 6, so that an oil source supplies oil to the active leveling cylinder 2 through the switching valve 6, a rod cavity of the active leveling cylinder 2 is selectively communicated with a rod cavity of the passive leveling cylinder 3, a rodless cavity of the active leveling cylinder 2 is selectively communicated with a rodless cavity of the passive leveling cylinder 3, and when the oil source supplies oil to the active leveling cylinder 2 through the switching valve 6, the hydraulic oil of the active leveling cylinder 2 can also flow to the passive leveling cylinder 3 to supply oil to the passive leveling cylinder 3. After the oil filling of the active leveling cylinder 2 and the passive leveling cylinder 3 is finished, the switching valve 6 can be used for switching, so that the oil source supplies oil to the active amplitude-changing cylinder 1 through the switching valve 6.

In an embodiment, referring to fig. 1 and fig. 6, the switching valve 6 has a first working port 61, a second working port 62, a third working port 63, a fourth working port 64, a fifth working port 65, a sixth working port 66, a first working position and a second working position. One of the first working oil port 61 and the second working oil port 62 is used for feeding oil, the other one of the first working oil port 61 and the second working oil port 62 is used for returning oil, the third working oil port 63 is selectively communicated with the rod cavity of the active leveling cylinder 2, the fourth working oil port 64 is selectively communicated with the rodless cavity of the active leveling cylinder 2, the fifth working oil port 65 is selectively communicated with the rod cavity of the active amplitude-changing cylinder 1, and the sixth working oil port 66 is selectively communicated with the rodless cavity of the active amplitude-changing cylinder 1. When the switching valve 6 is in the first working position, the first working oil port 61 is communicated with the third working oil port 63, the second working oil port 62 is communicated with the fourth working oil port 64, and the fifth working oil port 65 and the sixth working oil port 66 are cut off to supply oil to the main leveling cylinder. When the switching valve 6 is in the second working position, the first working oil port 61 is communicated with the fifth working oil port 65, the second working oil port 62 is communicated with the sixth working oil port 66, and the third working oil port 63 and the fourth working oil port 64 are cut off to supply oil to the active amplitude-varying cylinder 1.

In an embodiment, referring to fig. 1, the hydraulic system 100 further includes a third oil path 401 and a fourth oil path 402, one end of the third oil path 401 is communicated with the third working oil port 63, the other end of the third oil path 401 is communicated with the hydraulic lock 43, one end of the fourth oil path 402 is communicated with the fourth working oil port 64, and the other end of the fourth oil path 402 is communicated with the hydraulic lock 43. With the structure, when the third oil path 401 takes oil, the fourth oil path 402 returns oil, and when the fourth oil path 402 takes oil, the third oil path 401 returns oil.

In an embodiment, referring to fig. 1 and fig. 2, the other end of the third oil path 401 is communicated with an oil inlet of the first hydraulic control check valve 431, and the other end of the fourth oil path 402 is communicated with an oil inlet of the second hydraulic control check valve 432.

In an embodiment, referring to fig. 1, the hydraulic system 100 further includes a fifth oil path 403 and a sixth oil path 404, one end of the fifth oil path 403 is communicated with the fifth working port 65, and one end of the sixth oil path 404 is communicated with the sixth working port 66. In such a structure, when the fifth working oil port 65 supplies oil to the rod chamber of the active amplitude variation cylinder 1 through the fifth oil passage 403, the rodless chamber of the active amplitude variation cylinder 1 returns oil through the sixth oil passage 404. When the sixth working oil port 66 supplies oil to the rodless chamber of the active amplitude cylinder 1 through the sixth oil passage 404, the rod chamber of the active amplitude cylinder 1 returns oil through the fifth oil passage 403.

In one embodiment, referring to fig. 1, 3 and 4, the hydraulic system 100 includes a first bidirectional balancing valve set 7, a first bidirectional balancing valve set 7 is disposed for each passive leveling cylinder, the rod cavity of the active leveling cylinder 2 is selectively communicated with the rod cavity of each passive leveling cylinder 3 through the corresponding first bidirectional balancing valve set 7, and the rod-less cavity of the active leveling cylinder 2 is selectively communicated with the rod-less cavity of each passive leveling cylinder 3 through the corresponding first bidirectional balancing valve set 7. When the piston rod of the active leveling cylinder 2 stops stretching, the rod cavity of the passive leveling cylinder 3 and the rod cavity of the active leveling cylinder 2 are cut off by corresponding to the first bidirectional balancing valve group 7, and the rodless cavity of the passive leveling cylinder 3 and the rodless cavity of the active leveling cylinder 2 are cut off by corresponding to the first bidirectional balancing valve group 7. When a piston rod of the active leveling cylinder 2 stretches, a rod cavity of the passive leveling cylinder 3 is communicated with a rod cavity of the active leveling cylinder 2 through a corresponding first bidirectional balancing valve group 7, and a rodless cavity of the passive leveling cylinder 3 is communicated with a rodless cavity of the active leveling cylinder 2 through a corresponding first bidirectional balancing valve group 7. According to the structure, when the piston rod of the active leveling cylinder 2 stretches, hydraulic oil of the active leveling cylinder 2 enters the passive leveling cylinder 3 to cause the piston rod of the passive leveling cylinder 3 to stretch correspondingly, when the piston rod of the active leveling cylinder 2 stops stretching, the hydraulic oil in the passive leveling cylinder 3 is blocked in the passive leveling cylinder 3 by the first bidirectional balancing valve group 7, and the passive leveling cylinder 3 stops stretching, so that the passive leveling cylinder 3 and the active leveling cylinder 2 are ensured to move synchronously. Advantageously maintaining the work platform 808 substantially horizontal.

In one embodiment, referring to fig. 1, 3 and 4, the first balancing valve set 7 includes a first balancing valve 71 and a first balancing valve 71, the rod chamber of the passive leveling cylinder 3 is selectively communicated with the rod chamber of the active leveling cylinder 2 through the first balancing valve 71, and the rod-less chamber of the passive leveling cylinder 3 is selectively communicated with the rod-less chamber of the active leveling cylinder 2 through a second balancing valve 72. The first balancing valve 71 comprises a first pilot-operated return valve 711 and a third check valve 712, and the second balancing valve 72 comprises a second pilot-operated return valve 721 and a fourth check valve 722. The third check valve 712 is connected in parallel with the first hydraulic control oil return valve 711, an oil outlet of the third check valve 712 is communicated with an oil inlet of the first hydraulic control oil return valve 711, an oil inlet of the third check valve 712 is communicated with an oil outlet of the first hydraulic control oil return valve 711, and an oil inlet of the third check valve 712 is communicated with a control oil port of the second hydraulic control oil return valve 721. The fourth one-way valve 722 is connected with the second hydraulic control oil return valve 721 in parallel, an oil outlet of the fourth one-way valve 722 is communicated with an oil inlet of the second hydraulic control oil return valve 721, an oil inlet of the fourth one-way valve 722 is communicated with an oil outlet of the second hydraulic control oil return valve 721, and an oil inlet of the fourth one-way valve 722 is communicated with a control oil port of the first hydraulic control oil return valve 711. When the rod cavity of the active leveling cylinder 2 is communicated with the rod cavity of the passive leveling cylinder 3 through the third check valve 712, the oil at the oil inlet of the third check valve 712 enters the control oil port of the second hydraulic oil return valve 721, so that the rodless cavity of the passive leveling cylinder 3 is communicated with the rodless cavity of the active leveling cylinder 2 through the second hydraulic oil return valve 721, the hydraulic oil in the rod cavity of the active leveling cylinder 2 enters the rod cavity of the passive leveling cylinder 3 through the third check valve 712, the hydraulic oil in the rodless cavity of the passive leveling cylinder 3 returns to the rodless cavity of the active leveling cylinder 2 through the second hydraulic oil return valve 721, the piston rod of the active leveling cylinder 2 extends out, and the piston rod of the passive leveling cylinder 3 retracts. When the rodless cavity of the active leveling cylinder 2 is communicated with the rodless cavity of the passive leveling cylinder 3 through the fourth check valve 722, oil at the oil inlet of the fourth check valve 722 enters the control oil port of the first hydraulic oil return valve 711, so that the rod cavity of the passive leveling cylinder 3 is communicated with the rod cavity of the active leveling cylinder 2 through the first hydraulic oil return valve 711, the hydraulic oil in the rodless cavity of the active leveling cylinder 2 enters the rodless cavity of the passive leveling cylinder 3 through the fourth check valve 722, the hydraulic oil in the rod cavity of the passive leveling cylinder 3 returns to the rod cavity of the active leveling cylinder 2 through the second hydraulic oil return valve 721, the piston rod of the passive leveling cylinder 3 extends out, and the piston rod of the active leveling cylinder 2 retracts. When the piston rod of the active leveling cylinder 2 stops stretching and holding, the hydraulic oil at the oil inlet of the third check valve 712 cannot open the second hydraulic control oil return valve 721 through the control oil port of the second hydraulic control oil return valve 721, the rodless cavity of the passive leveling cylinder 3 is stopped from the rodless cavity of the active leveling cylinder 2 through the second hydraulic control oil return valve 721, the hydraulic oil at the oil inlet of the fourth check valve 722 cannot open the first hydraulic control oil return valve 711 through the control oil port of the first hydraulic control oil return valve 711, the rod cavity of the passive leveling cylinder 3 is stopped from the rod cavity of the active leveling cylinder 2 through the first hydraulic control oil return valve 711, and the passive leveling cylinder 3 cannot change the stretching position of the piston rod of the passive leveling cylinder 3 due to gravity or other external impact forces, which is beneficial to keeping the working platform 808 horizontal.

In one embodiment, referring to fig. 1 and 5, the hydraulic system 100 further includes a second bidirectional balancing valve bank 9, and the switching valve 6 is in selective communication with the active luffing cylinder 1 through the second bidirectional balancing valve bank 9.

In one embodiment, referring to fig. 1 and 5, the fifth working oil port 65 is selectively communicated with the rod chamber of the active amplitude cylinder 1 through the second two-way balancing valve group 9, and the sixth working oil port 66 is selectively communicated with the rodless chamber of the active amplitude cylinder 1 through the second two-way balancing valve group 9.

In one embodiment, referring to fig. 1 and 5, the second bidirectional balancing valve set 9 includes a third balancing valve 91 and a fourth balancing valve 92, the switching valve 6 is selectively communicated with the rod chamber of the active luffing cylinder 1 through the third balancing valve 91, and the switching valve 6 is selectively communicated with the rodless chamber of the active luffing cylinder 1 through the fourth balancing valve 92.

In one embodiment, referring to FIGS. 1 and 5, the fifth working port is in selective communication with the rodless chamber of the active luffing cylinder 1 via a third balancing valve 91 and the sixth working port is in selective communication with the rodless chamber of the active luffing cylinder 1 via a fourth balancing valve 92.

In one embodiment, referring to fig. 1 and 5, the third balancing valve 91 includes a third pilot-operated return valve 911 and a fifth check valve 912. The fourth balancing valve 92 includes a fourth pilot-operated return valve 921 and a sixth check valve 912. The fifth one-way valve 912 is connected with the third hydraulic control oil return valve 911 in parallel, an oil outlet of the fifth one-way valve 912 is communicated with an oil inlet of the third hydraulic control oil return valve 911, an oil inlet of the fifth one-way valve 912 is communicated with an oil outlet of the third hydraulic control oil return valve 911, and an oil inlet of the fifth one-way valve 912 is communicated with a control oil port of the fourth hydraulic control oil return valve 921. The sixth one-way valve 912 is connected with the fourth hydraulic control oil return valve 921 in parallel, the oil outlet of the sixth one-way valve 912 is communicated with the oil inlet of the fourth hydraulic control oil return valve 921, the oil inlet of the sixth one-way valve 912 is communicated with the oil outlet of the fourth hydraulic control oil return valve 921, and the oil inlet of the sixth one-way valve 912 is communicated with the control oil port of the third hydraulic control oil return valve 911. When the switching valve 6 is communicated with the rod cavity of the active amplitude cylinder 1 through the fifth check valve 912, hydraulic oil at the oil inlet of the fifth check valve 912 enters the control oil port of the fourth hydraulic control oil return valve 921 so that the fourth hydraulic control oil return valve 921 communicates the rodless cavity of the active amplitude cylinder 1 with the switching valve 6, oil is fed into the rod cavity of the active amplitude cylinder 1 through the fifth check valve 912, and oil is fed into the rodless cavity of the active amplitude cylinder 1 through the fourth hydraulic control oil return valve 921. When the switching valve 6 is communicated with the rodless cavity of the active amplitude cylinder 1 through the sixth one-way valve 912, hydraulic oil at an oil inlet of the sixth one-way valve 912 enters a control oil port of the third hydraulic control oil return valve 911 so that the third hydraulic control oil return valve 911 communicates the rod cavity of the active amplitude cylinder 1 with the switching valve 6, oil is fed into the rodless cavity of the active amplitude cylinder 1 through the sixth one-way valve 912, and oil is fed into the rod cavity of the active amplitude cylinder 1 through the third hydraulic control oil return valve 911. When the switching valve 6 is switched to supply oil to the active leveling cylinder 2, or the hydraulic system 100 stops working, the hydraulic oil at the oil inlet of the fifth check valve 912 cannot open the fourth hydraulic control oil return valve 921 through the control oil port of the fourth hydraulic control oil return valve 921, the hydraulic oil at the oil inlet of the sixth check valve 912 cannot open the third hydraulic control oil return valve 911 through the control oil port of the third hydraulic control oil return valve 911, the third hydraulic control oil return valve 911 stops the rod cavity of the active amplitude variation cylinder 1 from the switching valve 6, and the fourth hydraulic control oil return valve 921 stops the rodless cavity of the active amplitude variation cylinder 1 from the switching valve 6. The active luffing cylinder 1 does not change the telescopic position of the piston rod of the active luffing cylinder 1 due to gravity or other external impact forces, which is beneficial to keeping the working platform 808 in an adjusted position.

In one embodiment, the maintenance work equipment further comprises an electric control valve bank, wherein the electric control valve bank has a first state and a second state, when the electric control valve bank is in the first state, the electric control valve bank is configured to enable the first leveling cylinder 8092 and the first amplitude changing cylinder 8091 to move synchronously, and the second leveling cylinder 811 is locked, and when the electric control valve bank is in the second state, the electric control valve bank is configured to enable the second leveling cylinder 811 and the first amplitude changing cylinder 8091 to move synchronously, and the first leveling cylinder 8092 is locked.

The locking of the second leveling cylinder 811 means that the piston rod of the second leveling cylinder 811 does not extend and contract, and the locking of the first leveling cylinder 8092 means that the piston rod of the first leveling cylinder 8092 does not extend and contract.

In one embodiment, when the maintenance operation equipment is in a high-altitude operation state, the electric control valve bank is in a second state, the second leveling cylinder 811 and the first amplitude cylinder 8091 move synchronously, and the first leveling cylinder 8092 is locked. When the maintenance operation equipment is in a low-altitude operation state, the electric control valve bank is in a first state, the first leveling cylinder 8092 and the first amplitude-changing cylinder 8091 synchronously move, and the second leveling cylinder 811 is locked.

It should be noted that the electrical valve set and the connection oil paths thereof with the first luffing cylinder 8091, the first leveling cylinder 8092, and the second leveling cylinder 811 are known structures, and the description of the embodiment of the present application is omitted.

In one embodiment, referring to fig. 7, when the service work apparatus is in the folded state, the hinge point of the passive leveling cylinder 3 and the second arm 805 is located below the hinge point of the third arm 806 and the second arm 805. According to the structure, when the rod cavity of the active leveling cylinder 2 is selectively communicated with the rod cavity of the passive leveling cylinder 3, the rodless cavity of the active leveling cylinder 2 is selectively communicated with the rodless cavity of the passive leveling cylinder 3, and the hinge point position of the passive leveling cylinder 3 and the second arm 805 enables the extension and retraction of the active leveling cylinder 2 and the passive leveling cylinder 3 to be adaptive to the leveling of the working platform 808, and the occupied space is small. On the other hand, the passive leveling cylinder 3 can be disposed below the third arm 806, and the space below the third arm 806 can be fully utilized.

In one embodiment, when the service work apparatus is in the folded state, the hinge point of the passive leveling cylinder 3 and the second arm 805 is located above the hinge point of the third arm 806 and the second arm 805. In one embodiment, the work platform 808 comprises a platform body and a swivel drive table that is articulated to the leveling arm 807 and the second leveling cylinder 811, respectively, the swivel drive table driving the platform body to swivel.

It should be noted that, in both the high-altitude operation state and the low-altitude operation state, the passive leveling cylinder 3 and the active leveling cylinder 2 can synchronously move according to actual needs, so as to make the working platform 808 translate around the lower turntable 801.

In one embodiment, when the length of the maintenance operation equipment is 4.5m by 2.25m, the height of the maintenance operation equipment in high-altitude operation and the depth of the maintenance operation equipment in low-altitude operation can reach more than 3 meters and approach to 4 meters.

In one embodiment, the height of the high-altitude operation and the depth of the low-altitude operation are both referenced to the bottom surface of the lower turntable.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.