阅读说明：本技术 一种公铁两用清挖机液压系统 (Hydraulic system of highway and railway dual-purpose dredging machine ) 是由 刘小正 杜永胜 郑枫川 马锐 郭兴无 李增强 柳朝郸 吴育 羊怀茂 林文 赵全婧 于 2020-05-25 设计创作，主要内容包括：本发明提供了一种公铁两用清挖机液压系统,属于工程机械技术领域,该液压系统包括工作液压单元、行走液压单元和辅助液压单元,其中,工作液压单元用于控制、驱动清挖装置,行走液压单元用于控制、驱动胶轮马达和钢轮马达,辅助液压单元用于控制和驱动刹车油缸和转向油缸等,该系统涉及公铁两用清挖机中完整的液压控制和驱动方案,能够实现清挖机两侧履带独立控制、开沟装置和挖掘装置独立工作、整体车身角度灵活调整以及清挖深度调节等功能,一方面可以极大的提升公铁两用清挖机通过性,另一方面可以极大的提升公铁两用清挖机非平整路面的适应性,提高清挖效率的同时、保证清挖质量。(The invention provides a hydraulic system of a highway and railway dual-purpose cleaning and digging machine, which belongs to the technical field of engineering machinery and comprises a working hydraulic unit, a walking hydraulic unit and an auxiliary hydraulic unit, wherein the working hydraulic unit is used for controlling and driving a cleaning and digging device, the walking hydraulic unit is used for controlling and driving a rubber wheel motor and a steel wheel motor, the auxiliary hydraulic unit is used for controlling and driving a brake cylinder, a steering cylinder and the like, the system relates to a complete hydraulic control and driving scheme in the highway and railway dual-purpose cleaning and digging machine, and can realize the functions of independent control of two side tracks of the cleaning and digging machine, independent work of a ditching device and a digging device, flexible adjustment of the angle of an integral vehicle body, adjustment of the cleaning and digging depth and the like, on one hand, the trafficability of the highway and railway dual-purpose cleaning and digging machine can be greatly improved, on the other hand, the adaptability of a non-flat road surface of the highway and railway dual-purpose cleaning and digging machine can be greatly improved, the cleaning and digging efficiency can be simultaneously, Ensuring the dredging quality.)

1. The utility model provides a dual-purpose clear machine hydraulic system that digs of public railway, its characterized in that includes hydraulic tank (1), work hydraulic unit (2), walking hydraulic unit (3) and supplementary hydraulic unit (4), wherein:

the working hydraulic unit (2) comprises a working pump (201), a multi-way operation valve (202), a movable arm oil cylinder (203), a bucket oil cylinder (204), an arm cylinder (205), a swing oil cylinder (206), a quick-change connector (207), a screening bucket motor (208), an arm-joint oil cylinder (209) and a rotary motor (210), wherein an oil inlet of the working pump (201) is communicated with a hydraulic oil tank (1), an oil outlet of the working pump (201) is communicated with the multi-way operation valve (202), and the multi-way operation valve (202) distributes high-pressure oil to one or more of the movable arm oil cylinder (203), the bucket oil cylinder (204), the arm cylinder (205), the swing oil cylinder (206), the quick-change connector (207), the screening bucket motor (208), the arm-joint oil cylinder (209) and the rotary motor (210) at proper time;

the traveling hydraulic unit (3) comprises a traveling pump (301), a traveling switching valve (302), a steel wheel motor (303) and a rubber wheel motor (304), an oil inlet of the traveling pump (301) is communicated with the hydraulic oil tank (1), an oil outlet of the traveling pump (301) is communicated with the traveling switching valve (302), and the traveling switching valve (302) distributes high-pressure oil to one or more of the steel wheel motor (303) and the rubber wheel motor (304) timely;

the auxiliary hydraulic unit (4) comprises an auxiliary pump (401), a liquid charging valve (402), an energy storage device (403), a brake valve (404), a brake oil cylinder (405), a priority valve (406), a steering gear valve (407), a steering oil cylinder (408), a multi-way auxiliary valve (409), a support leg oil cylinder (410) and a rail clamping device oil cylinder (411), wherein an oil inlet of the auxiliary pump (401) is communicated with a hydraulic oil tank (1), an oil outlet of the auxiliary pump (401) is communicated with the liquid charging valve (402), the liquid charging valve (402) timely distributes high-pressure oil to the energy storage device (403), the brake valve (404) and the priority valve (406), the energy storage device (403) serves as standby energy and drives the brake oil cylinder (405) to work through the brake valve (404), the brake valve (404) is used for controlling the brake oil cylinder (405) to work, and the priority valve (406) timely distributes the high-pressure oil to the steering gear valve (407) and the multi-way auxiliary valve (409), the steering gear valve (407) is used for controlling the steering oil cylinder (408) to work, and the multi-way auxiliary valve (409) is used for controlling the supporting leg oil cylinder (410) and the rail clamping device oil cylinder (411) to work.

2. The hydraulic system of an all-terrain vehicle as defined in claim 1, wherein the multiple-operation valve (202) is an eight-way reversing valve.

3. The dual-purpose clear excavator hydraulic system according to claim 1, wherein the liquid charging valve (402) comprises a spring cut valve (EV), a main overflow valve (RV), an unloading valve (UP), a manual Pump (PM), a check valve (OV), a solenoid directional valve (SV) and a Pressure Sensor (PS), wherein:

the spring stop valve (EV) is arranged between a port P and a port P1 of the liquid filling valve (402); the main overflow valve (RV) is arranged between a port P and a port T of the liquid charging valve (402); the unloading valve (UP) is arranged between the control end of the spring stop valve (EV) and the T port of the liquid charging valve (402); the manual Pump (PM) is arranged between the G port and the T port of the liquid charging valve (402); the one-way valve (OV) is arranged between the P port and the AC port of the liquid charging valve (402); a first oil inlet of the electromagnetic directional valve (SV) is communicated with an AC port of the liquid charging valve (402) through a one-way valve (OV), a second oil inlet of the electromagnetic directional valve (SV) is communicated with a T port of the liquid charging valve (402), and an oil outlet of the electromagnetic directional valve (SV) is communicated with a BK port of the liquid charging valve (402); the Pressure Sensor (PS) is used for detecting the pressure of the accumulator (403) in real time.

4. The hydraulic system of an amphibious excavator according to claim 1, wherein the brake valve (404) is a three-position three-way control valve.

5. The hydraulic system of an amphibious excavator according to claim 1, wherein the multi-way auxiliary valve (409) is a four-way multi-way reversing valve.

6. The hydraulic system of a combined highway and railway excavator according to claim 1, wherein the working hydraulic unit (2) is used for controlling an excavating device (8) of the excavator, the excavating device (8) comprises a driving arm (801), a two-joint arm (802), a swinging arm (803), a boom arm (804) and a working bucket (805), wherein:

one end of the driving arm (801) is hinged to the rotary table (6), the other end of the driving arm (801) is hinged to one end of the two-section arm (802), the other end of the two-section arm (802) is hinged to one end of the deflection swing arm (803), the other end of the deflection swing arm (803) is hinged to one end of the bucket lever arm (804), and the other end of the bucket lever arm (804) is hinged to the operation bucket (805);

the swing arm oil cylinder (203) is arranged between the rotary table (6) and the driving arm (801) and used for driving the driving arm (801) to swing up and down, the arm joint oil cylinder (209) is arranged between the driving arm (801) and the two-joint arm (802) and used for driving the two-joint arm (802) to swing up and down, the swing arm oil cylinder (206) is arranged between the two-joint arm (802) and the swing arm (803) and used for driving the swing arm (803) to swing left and right, the arm cylinder (205) is arranged between the swing arm (803) and the arm (804) and used for driving the arm (804) to swing up and down, and the operation oil cylinder (204) is arranged between the arm (804) and the operation bucket (805) and used for driving the operation bucket (805) to swing up and down.

7. The dual-purpose road and railway dredger hydraulic system of claim 6, wherein the working bucket (805) is one of a bucket or a screening bucket, wherein: the bucket is divided into a bucket with holes and a bucket without holes, and a plurality of screening holes are uniformly formed in the side wall of the bucket with holes; a rotatable composite screen is arranged in the screening hopper, and the quick-change connector (207) is used for detachably connecting the operation hopper (805) and the hopper rod arm (804); the screen hopper motor (208) is used for driving the composite screen to work.

8. The hydraulic system of an excavator for highway and railway use according to claim 1, wherein the rotary motor (210) is installed between a chassis (5) and a rotary table (6) of the excavator and is used for driving the rotary table (6) and an operation chamber (7) on the rotary table (6) and the excavating device (8) to rotate.

9. The hydraulic system of the road and railway dual-purpose excavator is characterized in that the supporting leg oil cylinders (410) are arranged on two sides of the chassis (5) and used for driving the railway walking device (10) to retract or put down, the railway walking device (10) is driven to be composed of an auxiliary frame (1001) and rail wheels (1002), the auxiliary frame (1001) is hinged to the front side and the rear side of the chassis (5), the supporting leg oil cylinders (410) are arranged between the auxiliary frame (1001) and the chassis (5), and the rail wheels (1002) are arranged at two ends of the frame (1001).

10. The hydraulic system of the road and railway dual-purpose excavator is characterized in that the rail clamping device oil cylinder (411) is used for driving the rail clamping device (11) of the excavator to open and close, the rail clamping device (11) is arranged on the left side and the right side of the auxiliary frame (1001) and consists of a rail clamping beam (1101), clamping arms (1102) and a rolling disc (1103), one end of the rail clamping beam (1101) is installed on the auxiliary frame (1001), the two clamping arms (1102) are installed on the rail clamping beam (1101) through rotating shafts, and the rail clamping device oil cylinder (411) is arranged between the clamping arms (1102).

Technical Field

The invention belongs to the technical field of engineering machinery, and particularly relates to a hydraulic system of a highway and railway dual-purpose dredging machine.

Background

The excavator in the existing market is mainly in a crawler type or a wheel type, mainly meets the requirement of road running, is very inconvenient to move in track construction, and in order to solve the problems, part of technical personnel set simple steel wheels on the existing excavator, but the excavator is unsafe in use and is very complicated to disassemble and assemble due to the fact that the excavator does not have a contraction function and does not have rail clamping device equipment. Meanwhile, the working device can only work along the radial direction of the turning radius, and can not realize parallel excavation, so that the working device can not be suitable for excavating and cleaning grooves at two sides of a road and a railway and can not be suitable for excavating side grooves parallel to the side walls; when the railway track is operated on, the contact area of the chassis is reduced, the stability of the whole machine is reduced, and the operation performance is seriously influenced. The existing dredging machine has low automation degree, and for years, the mainstream dredging machine in the domestic market is realized by mechanical transmission, is mainly used for agricultural machinery industry, urban and rural ditches and the like, has single use working condition and is limited by more factors of construction site environment.

Disclosure of Invention

Aiming at the defects, the invention designs a novel hydraulic system of a highway and railway dual-purpose dredging machine, which relates to a complete hydraulic control and driving scheme in the highway and railway dual-purpose dredging machine, and can realize the functions of independent control of tracks on two sides of the dredging machine, independent work of a ditching device and an excavating device, flexible adjustment of the angle of an integral vehicle body, regulation of dredging depth and the like, on one hand, the trafficability of the highway and railway dual-purpose dredging machine can be greatly improved, on the other hand, the adaptability of the highway and railway dual-purpose dredging machine to a non-flat road surface can be greatly improved, and the dredging quality is ensured while the dredging efficiency is improved.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

the utility model provides a clear machine hydraulic system that digs of combined highway and railway includes hydraulic tank, work hydraulic unit, walking hydraulic unit and supplementary hydraulic unit, wherein: the working hydraulic unit comprises a working pump, a multi-path operation valve, a movable arm oil cylinder, a bucket rod oil cylinder, a deflection oil cylinder, a quick-change connector, a screening bucket motor, a pitch arm oil cylinder and a rotary motor, wherein an oil inlet of the working pump is communicated with a hydraulic oil tank, an oil outlet of the working pump is communicated with the multi-path operation valve, and the multi-path operation valve timely distributes high-pressure oil to one or more of the movable arm oil cylinder, the bucket rod oil cylinder, the deflection oil cylinder, the quick-change connector, the screening bucket motor, the pitch arm oil cylinder and the rotary motor; the walking hydraulic unit comprises a walking pump, a walking switching valve, a steel wheel motor and a rubber wheel motor, wherein an oil inlet of the walking pump is communicated with a hydraulic oil tank, an oil outlet of the walking pump is communicated with the walking switching valve, and the walking switching valve distributes high-pressure oil to one or more of the steel wheel motor and the rubber wheel motor in due time; the auxiliary hydraulic unit comprises an auxiliary pump, a liquid charging valve, an energy accumulator, a brake valve, a brake oil cylinder, a priority valve, a steering gear valve, a steering oil cylinder, a multi-way auxiliary valve, a support leg oil cylinder and a rail clamping device oil cylinder, an oil inlet of the auxiliary pump is communicated with a hydraulic oil tank, an oil outlet of the auxiliary pump is communicated with the liquid charging valve, the liquid charging valve distributes high-pressure oil to the energy accumulator, the brake valve and the priority valve in time, the energy accumulator drives the brake oil cylinder to work through the brake valve as standby energy, the brake valve is used for controlling the brake oil cylinder to work, the priority valve distributes the high-pressure oil to the steering gear valve and the multi-way auxiliary valve in time, the steering gear valve is used for controlling the steering oil cylinder to work, and the multi-way auxiliary valve is used for controlling the support leg oil cylinder and the rail clamping device oil cylinder to work.

Preferably, the multi-way operation valve is an eight-way multi-way reversing valve.

Preferably, the liquid charging valve comprises a spring stop valve, a main overflow valve, an unloading valve, a manual pump, a check valve, an electromagnetic directional valve and a pressure sensor, wherein: the spring stop valve is arranged between a port P and a port P1 of the liquid charging valve; the main overflow valve is arranged between the port P and the port T of the liquid charging valve; the unloading valve is arranged between the control end of the spring stop valve and the T port of the liquid charging valve; the manual pump is arranged between the port G and the port T of the liquid charging valve; the one-way valve is arranged between the port P and the port AC of the liquid charging valve; a first oil inlet of the electromagnetic directional valve is communicated with an AC port of the liquid charging valve through a one-way valve, a second oil inlet of the electromagnetic directional valve is communicated with a T port of the liquid charging valve, and an oil outlet of the electromagnetic directional valve is communicated with a BK port of the liquid charging valve; the pressure sensor is used for detecting the pressure of the energy accumulator in real time.

Preferably, the brake valve is a three-position three-way control valve.

Preferably, the multi-way auxiliary valve is a four-way multi-way reversing valve.

Preferably, the working hydraulic unit is used for controlling a dredging device of the dredging machine, the dredging device comprises a driving arm, a two-section arm, a partial swing arm, a bucket arm and a working bucket, wherein: the swing arm comprises a swing arm cylinder, a bucket arm, a swing arm cylinder, a bucket arm, a working oil cylinder, a bucket arm, a swing arm, a bucket arm, a rotary table.

Preferably, the working bucket is one of a bucket and a screening bucket, wherein: the bucket is divided into a bucket with holes and a bucket without holes, and a plurality of screening holes are uniformly formed in the side wall of the bucket with holes; a rotatable composite screen is arranged in the screening hopper, and the quick-change connector is used for detachably connecting the operation hopper and the hopper lever arm; and the screening hopper motor is used for driving the composite screen to work.

Preferably, the rotary motor is installed between a chassis and a rotary table of the excavator and is used for driving the rotary table, an operation chamber on the rotary table and the excavator device to rotate.

Preferably, the supporting leg oil cylinders are arranged on two sides of the chassis and used for driving the railway walking device to be folded or put down, the railway walking device is driven to be composed of an auxiliary frame and rail wheels, the auxiliary frame is hinged to the front side and the rear side of the chassis, the supporting leg oil cylinders are installed between the auxiliary frame and the chassis, and the rail wheels are arranged at two ends of the vehicle frame.

Preferably, the rail clamping device oil cylinder is used for driving the rail clamping device of the dredging machine to open and close, the rail clamping device is arranged on the left side and the right side of the auxiliary frame and consists of a rail clamping beam, clamping arms and a rolling disc, one end of the rail clamping beam is arranged on the auxiliary frame, the two clamping arms are arranged on the rail clamping beam through a rotating shaft, and the rail clamping device oil cylinder is arranged between the clamping arms.

The hydraulic system of the highway and railway dual-purpose excavator has the following beneficial effects:

(1) the invention can not only drive the dredging device to radially excavate, but also drive the dredging device to excavate in any direction in a running plane.

(2) The invention has two sets of independent traveling systems, can simultaneously meet the requirement of traveling on highways and railways, has an automatic retraction function for the railway traveling device, and can be lifted by the retraction oil cylinder when not in use.

(3) According to the invention, the rail clamping devices and the rail clamping device oil cylinders are arranged on the front auxiliary frame and the rear auxiliary frame, so that the chassis buckle can be locked on the rail when the whole machine works, and the working stability of the whole machine is improved.

Drawings

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a schematic structural diagram of a working hydraulic unit according to the present invention;

FIG. 3 is a schematic structural diagram of a traveling hydraulic unit according to the present invention;

FIG. 4 is a schematic structural diagram of a walking pump in the walking hydraulic unit;

FIG. 5 is a schematic diagram of the auxiliary hydraulic unit according to the present invention;

FIG. 6 is a schematic diagram of the charge valve in the auxiliary hydraulic unit;

FIG. 7 is a schematic diagram of a brake valve in the auxiliary hydraulic unit;

FIG. 8 is a schematic diagram of the construction of the diverter valve in the auxiliary hydraulic unit;

FIG. 9 is a schematic diagram of a multi-way auxiliary valve in the auxiliary hydraulic unit;

FIG. 10 is a first installation of the present invention on a backhoe;

FIG. 11 is a second mounting schematic of the present invention on a backhoe;

FIG. 12 is a third schematic illustration of the present invention installed on a dredger;

FIG. 13 is a fourth installation of the present invention on a backhoe;

FIG. 14 is a fifth installation of the present invention on a backhoe;

figure 15 is a sixth installation of the present invention on a dredger.

In the figure, 1-hydraulic oil tank, 2-working hydraulic unit, 201-working pump, 202-multi-way operation valve, 203-boom cylinder, 204-working cylinder, 205-arm cylinder, 206-yaw cylinder, 207-quick change connector, 208-screening bucket cylinder, 209-arm cylinder, 210-rotary motor, 3-walking hydraulic unit, 301-walking pump, 302-walking switching valve, 303-steel wheel motor, 304-rubber wheel motor, 305-walking electromagnetic control valve, 4-auxiliary hydraulic unit, 401-auxiliary pump, 402-liquid filling valve, 403-energy accumulator, 404-brake valve, 405-brake cylinder, 406-priority valve, 407-steering gear valve, 408-steering cylinder, 409-multi-way auxiliary valve, 410-supporting leg oil cylinders, 411-rail clamping device oil cylinders, 5-chassis, 6-rotary table, 7-operation room, 8-dredging device, 801-driving arm, 802-two-section arm, 803-inclined swing arm, 804-bucket lever arm, 805-operation bucket, 9-rubber wheel, 10-railway walking device, 1001-auxiliary frame, 1002-rail wheel, 11-rail clamping device, 1101-rail clamping beam, 1102-clamping arm and 1103-rolling disc.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The invention will be further explained with reference to the accompanying drawings in which:

as shown in fig. 1 to 9, the hydraulic system of the combined highway and railway excavator comprises a hydraulic oil tank 1, a working hydraulic unit 2, a traveling hydraulic unit 3 and an auxiliary hydraulic unit 4. In fig. 1, an oil inlet of a working pump 201 is communicated with a hydraulic oil tank 1, an oil outlet of the working pump 201 is communicated with a multi-way operating valve 202, and the multi-way operating valve 202 controls whether a boom cylinder 203, a bucket cylinder 204, an arm cylinder 205, a yaw cylinder 206, a quick-change connector 207, a sieve bucket motor 208, a pitch arm cylinder 209 and a rotation motor 210 work or not respectively. An oil inlet of the walking pump 301 is communicated with the hydraulic oil tank 1, an oil outlet of the walking pump 301 is communicated with the walking switching valve 302, and the walking switching valve 302 distributes high-pressure oil to one or more of the steel wheel motor 303 and the rubber wheel motor 304 timely. An oil inlet of an auxiliary pump 401 is communicated with a hydraulic oil tank 1, an oil outlet of the auxiliary pump 401 is communicated with a liquid filling valve 402, the liquid filling valve 402 timely distributes high-pressure oil to an energy storage device 403, a brake valve 404 and a priority valve 406, the energy storage device 403 serves as standby energy and drives the brake cylinder 405 to work through the brake valve 404, the brake valve 404 is used for controlling the brake cylinder 405 to work, the priority valve 406 timely distributes the high-pressure oil to a steering device valve 407 and a multi-way auxiliary valve 409, the steering device valve 407 is used for controlling the steering cylinder 408 to work, and the multi-way auxiliary valve 409 is used for controlling the support leg cylinder 410 and the rail clamping device cylinder 411 to work.

As shown in fig. 2, the working medium hydraulic oil is communicated from the hydraulic oil tank 1 to the working pump 201 through a pipeline, so that energy conversion is realized and the energy is used as a power source of the working device. Secondly, communicating high-pressure oil at the outlet of the working pump 201 with the multi-way operating valve 202 through a pipeline, realizing the distribution of hydraulic energy, and distributing the hydraulic energy to each action according to the actual requirement of a construction site; the multi-way operation valve 202 is connected with each actuator through a pipeline, so that the extending or retracting of each oil cylinder and the forward rotation or the reverse rotation of the hydraulic motor are realized. The working device system can realize construction within a certain working range through the extension or retraction of each oil cylinder. Due to the fact that the two-section arm and the deflection oil cylinder are additionally arranged, compared with a traditional excavator, the construction range is larger, the requirement on a construction site is lower compared with that of the excavator, and specifically, in the embodiment, the multi-way operating valve 202 is an eight-linkage multi-way reversing valve.

As shown in fig. 3, the working medium hydraulic oil is communicated from the hydraulic oil tank 1 to the closed pump oil supplementing pump port through a pipeline, the closed pump oil supplementing pump outlet is communicated with the tubular filter through a pipeline for filtering the hydraulic oil entering the closed pump, the outlet of the tubular filter enters the oil inlet of the closed pump all the way, the outlet of the tubular filter is communicated to the inlet of the one-way electromagnetic valve, the outlet of the one-way electromagnetic valve is connected to the walking switching valve through a pipeline respectively, and the valve core position of the walking switching valve is switched. Used for switching the walking state of the whole vehicle. The closed pump is communicated to an inlet of the walking switching valve through a pipeline and is used as a walking main oil way. The walking switching valve is communicated with the steel wheel motor and the rubber wheel motor through pipelines. The forward or backward movement of the whole machine is realized. Fig. 4 is a schematic structural diagram of the walking pump.

As shown in fig. 5, 6, 7 and 8, the working medium hydraulic oil is communicated to the hydraulic pump from the hydraulic oil tank through a pipeline, the hydraulic pump is communicated with the charge valve P through a pipeline, and the charge valve group comprises a right charge valve block part and an accumulator. The port A of the liquid charging valve is communicated with the brake valve through a pipeline, and the brake valve is connected with the brake oil cylinder through a pipeline and used for braking in the walking process of the excavator. Port P1 of the charge valve communicates through a line to port P of the priority valve. The priority valve is connected to the steering gear through a pipeline in one way, and is connected to a port P of the quadruple valve in the other way. The outlet of the steering gear is connected to a steering oil cylinder through a pipeline and used for adjusting the direction of the rubber wheel of the excavator in the running process. The quadruple valve is communicated to the supporting leg oil cylinder through a pipeline and used for posture adjustment when the clearing and excavating machine goes up a track, and the quadruple valve is communicated to the rail clamping device oil cylinder through a pipeline and used for protecting the clearing and excavating machine from side turning risks in the track running process of the clearing and excavating machine.

It should be noted that the charging valve 402 includes a spring stop valve EV, a main relief valve RV, an unloading valve UP, a manual pump PM, a check valve OV, a solenoid directional valve SV, and a pressure sensor PS, where: the spring cut-off valve EV is arranged between the port P and the port P1 of the charging valve 402; the main overflow valve RV is arranged between a port P and a port T of the charging valve 402; the unloading valve UP is arranged between the control end of the spring stop valve EV and the T port of the liquid charging valve 402; the manual pump PM is disposed between the G port and the T port of the charge valve 402; the check valve OV is arranged between the port P and the port AC of the liquid charging valve 402; a first oil inlet of the electromagnetic directional valve SV is communicated with an AC port of the prefill valve 402 through a one-way valve OV, a second oil inlet of the electromagnetic directional valve SV is communicated with a T port of the prefill valve 402, and an oil outlet of the electromagnetic directional valve SV is communicated with a BK port of the prefill valve 402; the pressure sensor PS is used to detect the pressure of the accumulator 403 in real time.

Specifically, the brake valve 404 is a three-position three-way control valve, and the multi-way auxiliary valve 409 is a four-way multi-way reversing valve.

As shown in fig. 10 to 15, the working hydraulic unit 2 is used for controlling a dredging device 8 of a dredger, the dredging device 8 including a driving arm 801, a two-joint arm 802, a yawing arm 803, a stick arm 804 and a working bucket 805, wherein: one end of the driving arm 801 is hinged to the rotary table 6, the other end of the driving arm 801 is hinged to one end of the two-section arm 802, the other end of the two-section arm 802 is hinged to one end of the swing arm 803, the other end of the swing arm 803 is hinged to one end of the bucket rod arm 804, and the other end of the bucket rod arm 804 is hinged to the working bucket 805. Specifically, in fig. 11, the boom cylinder 203 is disposed between the turntable 6 and the active boom 801 to drive the active boom 801 to swing up and down, the arm cylinder 209 is disposed between the active boom 801 and the second arm 802 to drive the second arm 802 to swing up and down, the swing cylinder 206 is disposed between the second arm 802 and the swing arm 803 to drive the swing arm 803 to swing left and right, the arm cylinder 205 is disposed between the swing arm 803 and the arm 804 to drive the arm 804 to swing up and down, and the working cylinder 204 is disposed between the arm 804 and the working bucket 805 to drive the working bucket 805 to swing up and down.

Specifically, four groups of rubber wheels are arranged at two ends of the chassis, and each group of rubber wheels adopts a double-tire structure. The hydraulic motor of the rubber wheel is connected with the double-end output gearbox, and finally the rubber wheel is driven to rotate, and the whole machine is driven to travel through the rubber wheel.

It should be noted that the working bucket 805 is one of a bucket and a sieving bucket, in which: the bucket is divided into a bucket with holes and a bucket without holes, and a plurality of screening holes are uniformly formed in the side wall of the bucket with holes; a rotatable composite screen is arranged in the screening hopper, and the quick-change connector 207 is used for detachably connecting the operation hopper 805 and the hopper rod arm 804; the screen hopper motor 208 is used to drive the composite screen to work.

In fig. 12, a slewing motor 210 is mounted between the chassis 5 and the turret 6 of the excavator and is used to rotate the turret 6 and the cab 7 on the turret 6 and the excavating device 8.

In fig. 13 and 14, the leg cylinders 410 are disposed on both sides of the chassis 5 to drive the railway running gear 10 to retract or put down, the railway running gear 10 is driven to be composed of a subframe 1001 and rail wheels 1002, the subframe 1001 is hinged on both front and rear sides of the chassis 5, the leg cylinders 410 are installed between the subframe 1001 and the chassis 5, and the rail wheels 1002 are disposed on both ends of the frame 1001. Specifically, when the whole machine does not run on the steel rail, the auxiliary frame is retracted. When the whole machine needs to walk on a steel rail, the auxiliary frame is put down, the oil cylinder controls the left rear frame to be put down, namely, the rail wheel touches down, the walking rubber wheel leaves the ground, the engine drives the hydraulic main pump, the power switching valve is switched at the moment, the hydraulic main pump is controlled to provide liquid pressure for the rail wheel hydraulic motor, the rail wheel hydraulic motor drives the rail wheel to rotate, and finally the whole machine is driven to walk through the rail wheel.

In fig. 15, the rail clamping device oil cylinder 411 is used for driving the rail clamping device 11 of the excavator to open and close, the rail clamping device 11 is arranged on the left side and the right side of the subframe 1001 and is composed of a rail clamping beam 1101, clamping arms 1102 and a rolling disc 1103, one end of the rail clamping beam 1101 is installed on the subframe 1001, the two clamping arms 1102 are installed on the rail clamping beam 1101 through a rotating shaft, and the rail clamping device oil cylinder 411 is arranged between the clamping arms 1102. In actual operation, as the rail clamping arms can rotate around the rotating shaft, when the rail clamping device oil cylinder stretches, the rail clamping arms 702 are necessarily caused to open or close. The rail clamping device can slide along the steel rail when the whole machine moves, so that the mobility of the whole machine is ensured, and the whole machine is prevented from being overturned accidentally.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.