阅读说明：本技术 高集成先导的多路阀组及起重机 (High-integration pilot multi-way valve bank and crane ) 是由 伊波 卢宇 李新 邹泉敏 于 2019-08-26 设计创作，主要内容包括：本发明提出了一种高集成先导的多路阀组,涉及起重机液压控制技术领域。高集成先导的多路阀组包括进油通道、回油通道T和连接在进油通道与回油通道T之间的第一进油联与若干执行联；第一进油联与若干执行联均为并联；第一进油联中进油通道和回油通道之间设置有减压阀和第一电磁通断阀；减压阀与第一电磁通断阀之间设置了X1/X2口,X1/X2口接先导手柄进油口。通过在第一进油联上设置减压阀、第一电磁通断阀以及接先导手柄进油口的X1/X2口,形成先导油路,为多路阀组的各个执行联提供先导油,将先导泵、先导油源阀高度集成在多路阀组的第一进油联上。与现有技术相比,连接管路少、占用空间小、装配效率高。(The invention provides a high-integration pilot multi-way valve bank, and relates to the technical field of crane hydraulic control. The high-integration pilot multi-way valve group comprises an oil inlet channel, an oil return channel T, a first oil inlet pair and a plurality of execution pairs, wherein the first oil inlet pair is connected between the oil inlet channel and the oil return channel T; the first oil inlet joint and the plurality of execution joints are connected in parallel; a pressure reducing valve and a first electromagnetic on-off valve are arranged between the oil inlet channel and the oil return channel in the first oil inlet joint; an X1/X2 port is arranged between the pressure reducing valve and the first electromagnetic on-off valve, and an X1/X2 port is connected with an oil inlet of a pilot handle. A pressure reducing valve, a first electromagnetic on-off valve and an X1/X2 port connected with an oil inlet of a pilot handle are arranged on the first oil inlet joint to form a pilot oil path, pilot oil is provided for each execution joint of the multi-way valve bank, and a pilot pump and a pilot oil source valve are highly integrated on the first oil inlet joint of the multi-way valve bank. Compared with the prior art, the connecting pipeline is less, the occupied space is small, and the assembling efficiency is high.)

1. A high integrated pilot multiway valve block, comprising: the oil inlet channel, the oil return channel and a first oil inlet link connected between the oil inlet channel and the oil return channel are connected with a plurality of execution links; the first oil inlet joint and the plurality of execution joints are connected in parallel;

a pressure reducing valve and a first electromagnetic on-off valve are arranged between the oil inlet channel and the oil return channel in the first oil inlet joint; an X1/X2 port is arranged between the pressure reducing valve and the first electromagnetic on-off valve, and an X1/X2 port is connected with an oil inlet of a pilot handle.

2. The high-integration pilot multi-way valve bank according to claim 1, wherein a damping filter screen is further arranged between the first oil inlet joint middle oil inlet channel and the pressure reducing valve; a first one-way valve is further arranged between the pressure reducing valve and the first electromagnetic on-off valve.

3. The high integrated pilot multi-way valve group according to claim 1, wherein the first oil inlet manifold further comprises a first overflow valve connected in parallel with the pressure reducing valve and the first electromagnetic on-off valve.

4. The high-integration-pilot multi-way valve group according to claim 1, further comprising a second oil inlet joint, wherein the oil inlet channels are divided into a first oil inlet channel and a second oil inlet channel, the first oil inlet joint is connected with the first oil inlet channel, and the second oil inlet joint is connected with the second oil inlet channel; and a first oil return backpressure valve and a second oil return backpressure valve are arranged in the second oil inlet joint, the first oil return backpressure valve and the second oil return backpressure valve are both arranged on the oil return channel, the first oil return backpressure valve is connected with a radiator, and the second oil return backpressure valve is connected with an oil return tank.

5. The high integrated pilot multiway valve bank of claim 4, wherein the first oil intake manifold further comprises a first diverter valve disposed in parallel between the first oil intake channel and the oil return channel; the second oil inlet joint also comprises a second flow dividing valve, and the second flow dividing valve is arranged between the second oil inlet channel and the oil return channel in parallel.

6. The high-integration-pilot multi-way valve bank according to claim 4, wherein a first main overflow valve is arranged between the first oil inlet channel and the oil return channel in parallel, and a second main overflow valve is arranged between the second oil inlet channel and the oil return channel in parallel.

7. The multi-way valve bank of high integrated pilot of claim 4, wherein the executive cascade comprises: the two pilot ports, the control reversing valve, the oil inlet, the oil return port and the two working ports; the two pilot ports are respectively a left pilot port and a right pilot port, the left pilot port is connected with a control oil port at the left end of the control reversing valve, the right pilot port is connected with a control oil port at the right end of the control reversing valve, and the on-off and reversing of an execution link and a corresponding execution mechanism oil path are realized by controlling the on-off and reversing of the reversing valve; the two working ports are respectively a first working port and a second working port and are connected with oil circuits at two ends of the actuating mechanism; the control reversing valve has two working states, and in the first working state, oil sequentially passes through the oil inlet, the first working port, the actuating mechanism, the second working port and the oil return port; in the second working state, oil sequentially passes through the oil inlet, the second working port, the actuating mechanism, the first working port and the oil return port.

8. The high integrated pilot multi-way valve group according to claim 7, further comprising a switching link, wherein the switching link comprises a second reversing valve, a fifth control reversing valve, a third shuttle valve and a third oil inlet; the second reversing valve is a hydraulic control reversing valve; an oil inlet of the second reversing valve is connected with the oil path branch of the first oil inlet channel; a control port of the second reversing valve is connected with a second oil inlet channel oil path branch; an oil outlet of the second reversing valve is connected with one inlet of a third shuttle valve, the other inlet of the third shuttle valve is connected with a third oil inlet, and an outlet of the third shuttle valve is connected with a control port of a fifth control reversing valve; the fifth control reversing valve has two working states: in the first working state, the first oil inlet channel is communicated with the second oil inlet channel; and in the second working state, the first oil inlet channel is disconnected from the second oil inlet channel.

9. The high-integration pilot multi-way valve group according to claim 8, wherein the switching unit further comprises a first reversing valve which is arranged between a third oil inlet and an oil inlet of the third shuttle valve, the first reversing valve is a two-position three-way electromagnetic valve, and a third oil port of the first reversing valve is connected with the oil return channel; when the first reversing valve is electrified, the third oil inlet is communicated with the third shuttle valve, and when the first reversing valve is not electrified, the third shuttle valve is communicated with the oil return channel.

10. A crane comprising a multi-way valve block of high integrated pilot as claimed in any one of claims 1 to 9, the actuator assembly comprising: a first execution unit and a second execution unit which are connected in parallel are arranged between the first oil inlet channel and the oil return channel; a third execution unit and a fourth execution unit which are connected in parallel are arranged between the second oil inlet channel and the oil return channel;

the first execution union is a telescopic union, the second execution union is a variable amplitude union, the third execution union is an auxiliary winch union, and the fourth execution union is a main winch union.

Technical Field

The invention belongs to the technical field of crane hydraulic control, and relates to a high-integration pilot multi-way valve bank and a crane.

Background

In engineering operation, a crane is widely used, when the crane works, a heavy object is hoisted by using a boom, then the heavy object is transferred from one position to another position by means of rotation of a rotary table to complete a work task, main actions comprise main hoisting, auxiliary hoisting, stretching, amplitude changing and rotation, and the first four actions are generally integrated on a main valve.

In order to enable a hydraulic system of the crane to work normally, a pilot control reversing valve needs to be arranged, and stable pilot oil is input to control reversing of a valve rod of the multi-way valve. In the prior art, a pilot control reversing valve group adopts a split design method, namely, all pilot control functions are integrated on an independent control reversing valve block and are connected with a multi-way valve (the multi-way valve is a crane getting-on hydraulic core control element and is used for realizing pressure, flow and reversing speed regulation control of hoisting, amplitude variation and telescopic action execution elements) or other control reversing valves through pipelines. The split design mode needs more connecting pipelines, occupies large space, wastes cost, influences field assembly efficiency, reduces attractiveness, has too many leakage points and easily causes oil leakage faults. Furthermore, as disclosed in CN105422530B "pilot integrated multi-way valve set and crane", only the pilot valve is integrated in the multi-way valve set, so the pilot pump and the pilot oil source pressure reducing valve block are still disposed outside the multi-way valve set. Therefore, the problems that more connecting pipelines are needed, the occupied space is large, the field assembly efficiency is influenced, too many leakage points exist, the oil leakage fault is easy to cause and the like still exist.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a high-integration pilot multi-way valve bank which is higher in integration level, less in connecting pipeline, small in occupied space and high in assembly efficiency.

The purpose of the invention can be realized by the following technical scheme: a high integrated pilot multiway valve stack comprising: the oil inlet channel, the oil return channel and a first oil inlet link connected between the oil inlet channel and the oil return channel are connected with a plurality of execution links; the first oil inlet joint and the plurality of execution joints are connected in parallel;

a pressure reducing valve and a first electromagnetic on-off valve are arranged between the oil inlet channel and the oil return channel in the first oil inlet joint; an X1/X2 port is arranged between the pressure reducing valve and the first electromagnetic on-off valve, and an X1/X2 port is connected with an oil inlet of a pilot handle.

As a further improvement of the invention, a damping filter screen is also arranged between the first oil inlet joint middle oil inlet channel and the pressure reducing valve; a first one-way valve is further arranged between the pressure reducing valve and the first electromagnetic on-off valve.

As a further improvement of the invention, the first oil inlet joint also comprises a first overflow valve which is connected with the reducing valve and the first electromagnetic on-off valve in parallel.

As a further improvement of the invention, the oil-feeding device also comprises a second oil-feeding joint, wherein the oil-feeding passages are divided into a first oil-feeding passage and a second oil-feeding passage, the first oil-feeding joint is connected with the first oil-feeding passage, and the second oil-feeding joint is connected with the second oil-feeding passage; and a first oil return backpressure valve and a second oil return backpressure valve are arranged in the second oil inlet joint, the first oil return backpressure valve and the second oil return backpressure valve are both arranged on the oil return channel, the first oil return backpressure valve is connected with a radiator, and the second oil return backpressure valve is connected with an oil return tank.

As a further improvement of the invention, the first oil inlet joint also comprises a first flow dividing valve, and the first flow dividing valve is arranged between the first oil inlet channel and the oil return channel in parallel; the second oil inlet joint also comprises a second flow dividing valve, and the second flow dividing valve is arranged between the second oil inlet channel and the oil return channel in parallel.

As a further improvement of the invention, a first main overflow valve is arranged between the first oil inlet channel and the oil return channel in parallel, and a second main overflow valve is arranged between the second oil inlet channel and the oil return channel in parallel.

As a further improvement of the present invention, the implementation union comprises: the two pilot ports, the control reversing valve, the oil inlet, the oil return port and the two working ports; the two pilot ports are respectively a left pilot port and a right pilot port, the left pilot port is connected with a control oil port at the left end of the control reversing valve, the right pilot port is connected with a control oil port at the right end of the control reversing valve, and the on-off and reversing of an execution link and a corresponding execution mechanism oil path are realized by controlling the on-off and reversing of the reversing valve; the two working ports are respectively a first working port and a second working port and are connected with oil circuits at two ends of the actuating mechanism; the control reversing valve has two working states, and in the first working state, oil sequentially passes through the oil inlet, the first working port, the actuating mechanism, the second working port and the oil return port; in the second working state, oil sequentially passes through the oil inlet, the second working port, the actuating mechanism, the first working port and the oil return port.

As a further improvement of the invention, the executive unit also comprises a pressure compensation valve, the control reversing valve is communicated with the pressure compensation valve to transmit the load pressure to the load sensitive channel, the load sensitive channel comprises a first load sensitive channel and a second load sensitive channel, and a variable pump is connected between the first load sensitive channel and the second load sensitive channel.

As a further improvement of the invention, the hydraulic control system further comprises a switching connection, wherein the switching connection comprises a second reversing valve, a fifth control reversing valve, a third shuttle valve and a third oil inlet; the second reversing valve is a hydraulic control reversing valve; an oil inlet of the second reversing valve is connected with the oil path branch of the first oil inlet channel; a control port of the second reversing valve is connected with a second oil inlet channel oil path branch; an oil outlet of the second reversing valve is connected with one inlet of a third shuttle valve, the other inlet of the third shuttle valve is connected with a third oil inlet, and an outlet of the third shuttle valve is connected with a control port of a fifth control reversing valve; the fifth control reversing valve has two working states: in the first working state, the first oil inlet channel is communicated with the second oil inlet channel; and in the second working state, the first oil inlet channel is disconnected from the second oil inlet channel.

As a further improvement of the invention, the switching unit further comprises a first reversing valve which is arranged between the third oil inlet and the oil inlet of the third shuttle valve, the first reversing valve is a two-position three-way electromagnetic valve, and the third oil inlet of the first reversing valve is connected with the oil return channel; when the first reversing valve is electrified, the third oil inlet is communicated with the third shuttle valve, and when the first reversing valve is not electrified, the third shuttle valve is communicated with the oil return channel.

As a further improvement of the invention, the first load sensing channel and the second load sensing channel are also respectively connected to a fifth control reversing valve; when the fifth control reversing valve is in the first working state, the first load sensing channel is communicated with the second load sensing channel; when the fifth control reversing valve is in the second working state, the first load sensitive channel is disconnected with the second load sensitive channel.

The invention also provides a crane, which comprises the high-integration pilot multi-way valve bank, and the execution unit comprises: a first execution unit and a second execution unit which are connected in parallel are arranged between the first oil inlet channel and the oil return channel; a third execution unit and a fourth execution unit which are connected in parallel are arranged between the second oil inlet channel and the oil return channel; the first execution union is a telescopic union, the second execution union is a variable amplitude union, the third execution union is an auxiliary winch union, and the fourth execution union is a main winch union.

Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects: according to the invention, the pressure reducing valve, the first electromagnetic on-off valve and the X1/X2 port connected with the oil inlet of the pilot handle are arranged on the first oil inlet joint to form a pilot oil path, pilot oil is provided for each execution joint of the multi-way valve bank, and the pilot pump and the pilot oil source valve are highly integrated on the first oil inlet joint of the multi-way valve bank. Compared with the prior art, the connecting pipeline is less, the occupied space is small, and the assembling efficiency is high.

Drawings

Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:

fig. 1 is a hydraulic schematic diagram of a high-integration pilot multi-way valve bank of the invention.

Fig. 2 is a partial enlarged view of a first oil intake linkage hydraulic schematic diagram.

Fig. 3 is a partial enlarged view of a hydraulic schematic diagram of the first oil inlet joint and the first actuating joint.

Fig. 4 is a partially enlarged view of a switching hydraulic schematic.

Fig. 5 is a partially enlarged view of a hydraulic schematic diagram of the second, switching, and third actuators.

Fig. 6 is a partial enlarged view of a hydraulic schematic diagram of a fourth implementation set and a second oil inlet set.

In the figure, 110, a damping filter screen; 120. a pressure reducing valve; 130. a first check valve; 140. a first electromagnetic on-off valve; 150. a first overflow valve; 160. a first diverter valve; 170. a second diverter valve; 210. a first direction changing valve; 220. a second directional control valve; 230. a fifth control directional control valve; 240. and (6) first damping.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 6.

A multi-way valve group with high integrated pilot, as shown in fig. 1, comprising: the oil inlet channel, the oil return channel, the first oil inlet connector and the second oil inlet connector which are connected in parallel between the oil inlet channel and the oil return channel, and the plurality of execution connectors. The oil feed passageway divide into two the tunnel in this embodiment: a first oil inlet passage P1, a second oil inlet passage P2; the first oil inlet passage P1 and the second oil inlet passage P2 respectively externally connect the main pump.

The first oil inlet pair is communicated with the first oil inlet passage P1 and the oil return passage, and the executing pair includes a first executing pair and a second executing pair which are connected in parallel between the first oil inlet passage P1 and the oil return passage.

The second oil inlet joint is communicated with the second oil inlet passage P2 and the oil return passage, and the executing joint further comprises a third executing joint and a fourth executing joint which are connected in parallel between the second oil inlet passage P2 and the oil return passage, specifically, the third executing joint is an auxiliary winch joint in this embodiment, and the fourth executing joint is a main winch joint.

The first oil inlet is connected, as shown in fig. 2, and comprises: the damping filter screen 110, the pressure reducing valve 120, the first check valve 130 and the first electromagnetic on-off valve 140 are sequentially arranged between the first oil inlet channel P1 and an oil return channel, specifically a first oil return channel T0; a first relief valve 150 connected in parallel with the pressure reducing valve 120 and the first electromagnetic on-off valve 140 is also provided; an X1/X2 port is arranged between the first check valve 130 and the first electromagnetic on-off valve 140, and an X1/X2 port is connected with an oil inlet of a pilot handle. The first inlet port introduces oil through a first inlet passage P1 to serve as a pilot source for each actuation port of the multi-port valve block. First overflow valve 150 guarantees that the oil pressure of first oil feed antithetical couplet is at the limited numerical value, and the fluid that exceeds overflows through first overflow valve 150 off-load. Through the above arrangement, the pilot pump and the pilot oil source valve are integrated in the first oil inlet union, stable pilot oil is provided for each execution union of the multi-way valve group, connecting pipelines are further reduced, and the multi-way valve group occupies smaller space and is higher in assembly efficiency.

The damping filter screen 110 is used for filtering oil injected into the first oil inlet channel P1 and the second oil inlet channel P2 through the filter screen, so that impurities in the oil are prevented from entering the multi-way valve bank, and the risk of blockage of damping is reduced; the damping can reduce pressure shock, reduce pilot port flow, and ensure that the pressure relief port of the pressure relief valve 120 maintains a stable pressure.

The overflow valve is used for pressure protection, and when the pressure of the corresponding working oil port exceeds the set pressure, the overflow valve is opened, unloaded and overflows, so that the pressure of the working oil port is limited. In the present embodiment, it is preferable that the first relief valve 150 defines the working pressure of the first oil intake linkage.

When the multi-way valve group works, the first electromagnetic on-off valve 140 is powered on and off, oil is led in through the first oil inlet channel P1 and sequentially passes through the damping filter screen 110, the pressure reducing valve 120, the first one-way valve 130 and the first electromagnetic on-off valve 140 to reach the X1/X2, at the moment, the working voltage is established at the X1/X2 port, and the multi-way valve group is pushed to realize the reversing of the multi-way valve group to each execution joint control reversing valve DV.

When the electromagnetic valve does not work, the first electromagnetic on-off valve 140 is powered off and communicated, oil reaches the oil return channel through the first electromagnetic on-off valve 140, and pressure is not built.

Further, a first main overflow valve R1 is arranged between the first oil inlet channel P1 and the oil return channel in parallel, a second main overflow valve R2 is arranged between the second oil inlet channel P2 and the oil return channel in parallel, the second main overflow valve R2 is used for limiting the system pressure of the whole multi-way valve, and when the oil pressure of the system exceeds the set pressure, the overflow valves are opened, unloaded and overflowed.

Further, the first oil inlet joint also comprises a first flow dividing valve 160, and the first flow dividing valve 160 is arranged between the first oil inlet passage P1 and the oil return passage in parallel; the second oil inlet union further comprises a second flow dividing valve 170, and the second flow dividing valve 170 is arranged between the second oil inlet passage P2 and the oil return passage in parallel; the overflow ports of the first flow dividing valve 160 and the second flow dividing valve 170 are connected with the load sensitive channel, the first flow dividing valve 160 and the second flow dividing valve 170 play a flow dividing role and can be used for configuring a fixed displacement pump, and the flow dividing valves are matched with the multi-way valves to respectively execute a joint control reversing valve DV so as to achieve a proportional effect.

As shown in fig. 6, the second oil inlet pair introduces oil from the second oil inlet passage P2 and flows into the oil return passage; wherein, the oil return channel is provided with a first oil return back pressure valve T1 and a second oil return back pressure valve T2. The oil return back pressure valve is used for providing pressure for oil supplement of the oil supplement type overflow valves of the third execution unit and the fourth execution unit, and preferably, the first oil return back pressure valve T1 is preset with 3bar of back pressure and connected with a radiator; the second oil return back pressure valve T2 is connected with the oil return tank, and the preset back pressure is 7 bar. The advantage of setting like this is that if the radiator blocked, hydraulic oil can also be returned the case through second oil return backpressure valve T2, improves the security.

The execution union comprises: the two pilot ports, the control reversing valve DV, the oil inlet, the oil return port and the two working ports; the two pilot ports are respectively a left pilot port a and a right pilot port b, the left pilot port a is connected with a control oil port at the left end of a control reversing valve DV, the right pilot port b is connected with a control oil port at the right end of the control reversing valve DV, and the on-off and reversing of an execution link and a corresponding execution mechanism oil path are realized by controlling the on-off and reversing of the reversing valve DV; the two working ports are respectively a first working port A and a second working port B and are connected with oil circuits at two ends of the actuating mechanism; the control reversing valve DV has two working states to form a working oil way, and in the first working state, oil sequentially passes through the oil inlet, the first working port A, the actuating mechanism, the second working port B and the oil return port; in the second working state, oil sequentially passes through the oil inlet, the second working port B, the actuating mechanism, the first working port A and the oil return port.

It should be noted that, according to different situations, the operation state and the connection mode of the control and directional valve DV of each execution unit are different, and this embodiment is only one preferred mode, and includes but not limited to the situations listed in this embodiment.

Further, the executive union also comprises a pressure compensation valve SC, the control reversing valve DV is communicated with the pressure compensation valve SC to transmit load pressure to a load sensitive channel, specifically, one inlet of the pressure compensation valve SC is communicated with a valve core driving end and a working oil path of the control reversing valve DV, the other inlet of the pressure compensation valve SC is communicated with the other valve core driving end and the load sensitive channel, the load sensitive channel comprises a first load sensitive channel LS1 and a second load sensitive channel LS2, and a variable pump is connected between the first load sensitive channel LS1 and the second load sensitive channel LS 2. Specifically, pressure compensating valves SC in a first execution group and a second execution group which are connected in parallel between a first oil inlet passage P1 and an oil return passage are communicated with a first load sensitive passage LS 1; the pressure compensating valves SC in the third and fourth execution groups connected in parallel between the second oil inlet passage P2 and the oil return passage communicate with the second load sensing passage LS 2.

A variable pump is connected between the first load sensing channel LS1 and the second load sensing channel LS 2. The feedback pressure is fed back to the variable pump by connecting the variable pump, and is used for the variable of the variable pump.

Furthermore, the oil ports of the variable pump, at which the first load sensing channel LS1 and the second load sensing channel LS2 are connected, are provided with two-way throttle valves C3, the two-way throttle valves C3 have the specific structure of two one-way throttle valves C connected in parallel, and the two-way throttle valves C3 are used for stabilizing the oil pressure of the first load sensing channel LS1 and the second load sensing channel LS2 and avoiding the fluctuation of the oil pressure from being fed back to the variable pump.

The high-integration pilot multiway valve group further comprises a switching connection, as shown in fig. 3 and 4, the switching connection comprises: a third oil inlet P3, a second direction changing valve 220, a fifth control direction changing valve 230, a first shuttle valve SV1, a second shuttle valve SV2 and a third shuttle valve SV 3; wherein, the second direction valve 220 is a hydraulic control direction valve; two inlets of the first shuttle valve SV1 are respectively connected with oil path branches of the first execution union and the second execution union, and an outlet of the first shuttle valve SV1 is connected with an oil inlet of the second reversing valve 220; two inlets of the second shuttle valve SV2 are respectively connected with oil path branches of a third execution unit and a fourth execution unit, and an outlet of the second shuttle valve SV2 is connected with a control port of the second reversing valve 220; an oil outlet of the second reversing valve 220 is connected with an inlet of a third shuttle valve SV3, the other inlet of the third shuttle valve SV3 is connected with a third oil inlet P3, and an outlet of the third shuttle valve SV3 is connected with a control port of a fifth control reversing valve 230; the fifth control directional valve 230 has two operating states: in the first working state, the first oil inlet passage P1 is communicated with the second oil inlet passage P2; in the second operating state, the first oil inlet passage P1 is disconnected from the second oil inlet passage P2.

The fifth control directional valve 230 defaults to the first operating state, at which time the first oil inlet passage P1 communicates with the second oil inlet passage P2 to form a confluence. When the actuator communicated between the first oil inlet passage P1 and the oil return passage and the actuator communicated between the second oil inlet passage P2 and the oil return passage do not have simultaneous oil passing actions, the second reversing valve 220 and the fifth control reversing valve 230 do not reverse, and the state that the first oil inlet passage P1 is communicated with the second oil inlet passage P2 is still maintained.

The shunting realization mode has two kinds, one kind is manual reposition of redundant personnel, and the theory of operation is as follows: when the third oil inlet P3 is filled with oil, the oil pushes the third shuttle valve SV3 open, the fifth control reversing valve 230 is reversed, the second operating state is achieved, and the first oil inlet passage P1 is disconnected from the second oil inlet passage P2 to form shunting. The oil is supplied to the first oil inlet passage P1 for the first execution unit and the second execution unit, and the oil is supplied to the third execution unit and the fourth execution unit by the second oil inlet passage P2, so that the mutual actions are not interfered, the flow distribution is better, and the compound action is better executed.

Another way to realize the shunting is automatic shunting, and the working principle is as follows: when the first executing mechanism or the second executing mechanism which is communicated between the first oil inlet channel P1 and the oil return channel and the third executing mechanism or the fourth executing mechanism which is communicated between the second oil inlet channel P2 and the oil return channel are simultaneously communicated with oil, oil is injected into an oil inlet and a control port of the second reversing valve 220, so that the second reversing valve 220 reverses, an oil outlet of the first shuttle valve SV1 is communicated with an oil inlet of the third shuttle valve SV3, the oil pushes the third shuttle valve SV3 open and pushes a control port of the fifth control reversing valve 230 at the same time, the fifth control reversing valve 230 reverses, the first working state is converted into the second working state, the first oil inlet channel P1 is disconnected from the second oil inlet channel P2, and the flow is automatically controlled to be divided and merged, so that the flow distribution is more reasonable, time and labor are saved.

Further, the switching unit further comprises a first reversing valve 210 which is arranged between a third oil inlet P3 and an oil inlet of a third shuttle valve SV3, the first reversing valve 210 is a two-position three-way electromagnetic valve, and the third oil inlet of the first reversing valve 210 is connected with an oil return channel; when the first direction valve 210 is powered on, the third oil inlet P3 is communicated with the third shuttle valve SV3, and when the first direction valve 210 is powered off, the third shuttle valve SV3 is communicated with the oil return channel. The first direction valve 210 is electrically controlled, and the oil injected into the third oil inlet P3 may flow back through the oil return passage, so that the oil flows more reasonably.

Further, a first damper 240 is arranged at a control port of the fifth control reversing valve 230, so that the oil flows more stably, and the reversing stability of the fifth control reversing valve 130 is ensured.

Further, the first load sensing passage LS1 and the second load sensing passage LS2 are respectively connected to the fifth control directional control valve 230; when the fifth control reversing valve 230 is in the first working state, the first load sensing passage LS1 is communicated with the second load sensing passage LS 2; when the fifth control directional valve 230 is in the second working state, the first load sensing passage LS1 is disconnected from the second load sensing passage LS 2.

Furthermore, two inlets of the first shuttle valve SV1 are respectively connected with a valve core control port of a pressure compensation valve SC in the first execution linkage and the second execution linkage, which is communicated with a control reversing valve working oil path; two inlets of the second shuttle valve SV2 are respectively connected with a valve core control port of the pressure compensation valve SC in the third execution linkage and the fourth execution linkage, which is communicated with a working oil path of the control reversing valve.

In actual production, the one-way throttle valve C and the electromagnetic valve V can be arranged according to actual needs, and the one-way throttle valve C and the electromagnetic valve V are not required to be arranged at the same time. This embodiment is merely an example of a preferred embodiment, and the present invention is not limited to this embodiment.

Further, in each execution union, a secondary overflow valve PR is arranged between a working port communicated with each execution mechanism and the oil return channel in parallel. More specifically, in the third and fourth execution gangs, the secondary relief valve PR is an oil replenishment type relief valve. The secondary overflow valve PR is used for ensuring the oil pressure of the first execution union and the second execution union, and when the oil pressure of the working oil port exceeds a set pressure, the overflow valve is opened, unloaded and overflows to provide secondary protection for the first execution union and the second execution union. The oil supplementing type overflow valve can ensure the oil pressure of the third execution unit and the fourth execution unit and provide secondary protection, and can supplement oil through the first oil return back pressure valve T1 and the second oil return back pressure valve T2 to provide pressure and ensure the normal operation of the third execution unit and the fourth execution unit.

The invention also provides a crane which comprises the high-integration pilot multi-way valve bank.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.