CN221033395U - Speed-regulating electrohydraulic control reversing valve - Google Patents

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a speed-regulating electro-hydraulic control reversing valve, which comprises a valve body, a reversing valve assembly and a control system, wherein the reversing valve assembly is arranged in the valve body and comprises a first reversing valve and a second reversing valve, the first reversing valve can be switched among a first state, a second state and a third state, the second reversing valve can be switched among a fourth state and a fifth state, the control system comprises a pilot valve assembly, the pilot valve assembly is connected with the reversing valve assembly to convey different pressures to the reversing valve assembly, so that the second reversing valve is in the fifth state while the first reversing valve is in the third state, the second reversing valve is in the fifth state while the first reversing valve is in the first state, and the second reversing valve is in the fourth state while the first reversing valve is in the first state.

Description

Speed-regulating electrohydraulic control reversing valve

Technical Field

The utility model relates to the technical field of hydraulic control, in particular to a speed-regulating electro-hydraulic control reversing valve.

Background

The electrohydraulic control reversing valve is a control core component of an electrohydraulic control system, is a hydraulic reversing valve which is formed by combining an electromagnetic pilot valve and a main valve into a whole, and utilizes high-pressure liquid in a liquid path of the electromagnetic pilot valve to push a main valve core to control the action of an executive element. The electrohydraulic control reversing valve is used as a key element of electrohydraulic control of a hydraulic support, and plays an important role in realizing comprehensive mechanized mining and unmanned mining of a coal mine. In the related art, the control accuracy of the electro-hydraulic control reversing valve is improved by adopting the form of an electro-hydraulic servo valve control cylinder or realizing flow control through the cooperative work of a plurality of reversing valves with different flow, but the control accuracy of the electro-hydraulic control reversing valve is high in transformation cost due to the fact that a pipeline is required to be reconnected.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides the speed-regulating electro-hydraulic control reversing valve, which can reduce the transformation cost and improve the control precision.

The speed-regulating electro-hydraulic control reversing valve of the embodiment of the utility model comprises: a valve body; a reversing valve assembly disposed within the valve body, the reversing valve assembly including a first reversing valve having a first fluid inlet and a first fluid return, the first reversing valve being switchable between a first state in which the first fluid return is adapted to communicate with a first chamber of an actuator, a second state in which a portion of the first fluid inlet is in communication with the first chamber, and a third state in which all of the first fluid inlet is in communication with the first chamber, and a second reversing valve having a second fluid inlet and a second fluid return, the second reversing valve being switchable between a fourth state in which the second fluid inlet is in communication with a second chamber of the actuator, and a fifth state in which the second fluid return is in communication with the second chamber; the control system comprises a pilot valve assembly, wherein the pilot valve assembly is connected with the reversing valve assembly to convey different pressures to the reversing valve assembly, so that the first reversing valve is controlled to be in a third state, the second reversing valve is controlled to be in a fifth state, the first reversing valve is controlled to be in the second state, the second reversing valve is controlled to be in the fifth state, and the first reversing valve is controlled to be in the first state, and the second reversing valve is controlled to be in the fourth state.

The speed-regulating electro-hydraulic control reversing valve provided by the embodiment of the utility model can reduce the transformation cost and improve the control precision.

In some embodiments, the number of reversing valve assemblies is a plurality, the number of pilot valve assemblies is a plurality, and the plurality of pilot valve assemblies respectively control the states of the plurality of reversing valve assemblies to control the plurality of actuators.

In some embodiments, the pilot valve assembly includes a third reversing valve having a second control port and a second working port, the third reversing valve having a third inlet port, a third return port, and a third working port, the second working port in communication with the second chamber, the third working port in communication with the second control port, the second reversing valve in a fourth state when the third working port is in communication with the third inlet port, and the second reversing valve in a fifth state when the third working port is in communication with the third return port.

In some embodiments, the speed regulating electro-hydraulic reversing valve further comprises a liquid inlet pipeline and a liquid return pipeline, wherein the second liquid inlet port is communicated with the liquid inlet pipeline, the second liquid return port is communicated with the liquid return pipeline, the second working port is communicated with the second liquid inlet port in the fourth state, and the second working port is communicated with the second liquid return port in the fifth state.

In some embodiments, the first reversing valve has a first working port in communication with the first chamber, a first fluid inlet in communication with the fluid inlet line, a first fluid return port in communication with the fluid return line, in the first state, the first working port in communication with the first fluid return port, in the second state, the first working port in communication with a portion of the first fluid inlet, in the third state, the first working port in communication with all of the first fluid inlet.

In some embodiments, the control system further comprises a first pilot valve having a fourth inlet port in communication with the inlet line, a fourth return port in communication with the return line, and a fourth working port in communication with the first control port and the third control port to place the first pilot valve in a second state or a third state, respectively, while placing the third working port of the third pilot valve in communication with the third return port and the third return port in communication with the return line.

In some embodiments, the control system further comprises a second pilot valve having a fifth liquid inlet in communication with the liquid inlet line, a fifth liquid return in communication with the liquid return line, and a fifth working port in communication with the third liquid inlet.

In some embodiments, the control system further comprises a one-way overflow valve having a first inlet in communication with the fourth working port, the first control port, and the third control port, and a first outlet in communication with the fifth working port and the third liquid inlet.

In some embodiments, the control system further comprises a controller connectable to the first pilot valve to communicate the fourth working port with the fourth liquid inlet and to communicate with the fourth liquid return port when the controller is disconnected from the first pilot valve; and/or the controller can be connected with the second pilot valve so as to enable the fifth working port to be communicated with the fifth liquid inlet, and when the controller is disconnected with the second pilot valve, the fifth working port is communicated with the fifth liquid return port.

In some embodiments, the control system further comprises: the first one-way valve is arranged on the liquid inlet pipeline; and/or, a second one-way valve, which is arranged on the liquid return pipeline; and/or the filter is arranged on the liquid inlet pipeline.

Drawings

Fig. 1 is a schematic structural diagram of a speed-regulating electro-hydraulic reversing valve according to an embodiment of the present utility model.

Fig. 2 is a schematic structural view of another view angle of the speed regulating electro-hydraulic control reversing valve according to the embodiment of the utility model.

Fig. 3 is a schematic diagram of a speed regulating electro-hydraulic control reversing valve according to an embodiment of the utility model.

Reference numerals:

actuator 100, cylinder 110, first chamber 111, second chamber 112, piston 113, piston rod 114, valve body 200,

A first reversing valve 1, a first liquid inlet 11, a first liquid return 12, a first control port 13, a first working port 14, a second reversing valve 2, a second liquid inlet 21, a second liquid return 22, a second control port 23, a second working port 24,

The control system 3, the third reversing valve 31, the third liquid inlet 311, the third liquid return port 312, the third control port 313, the third working port 314, the first pilot valve 32, the fourth liquid inlet 321, the fourth liquid return port 322, the fourth working port 323, the second pilot valve 33, the fifth liquid inlet 331, the fifth liquid return port 332, the fifth working port 333, the one-way overflow valve 34, the first inlet 341, the first outlet 342, the controller 35, the first one-way valve 36, the second one-way valve 37, the filter 38, the liquid inlet pipeline 4, and the liquid return pipeline 5.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The speed-regulating electro-hydraulic control reversing valve comprises a valve body 200, a reversing valve assembly and a control system 3. The reversing valve assembly is arranged in the valve body 200, the reversing valve assembly comprises a first reversing valve 1 and a second reversing valve 2, the first reversing valve 1 is provided with a first liquid inlet 11 and a first liquid return 12, the first reversing valve 1 is switchable between a first state, a second state and a third state, the first liquid return 12 is suitable for being communicated with the first chamber 111 of the actuator 100, the second state is provided with a part of the first liquid inlet 11 communicated with the first chamber 111, the third state is provided with a second liquid inlet 21 and a second liquid return 22, the second reversing valve 2 is switchable between a fourth state and a fifth state, the second liquid inlet 21 is communicated with the second chamber 112 of the actuator 100, and the second liquid return 22 is communicated with the second chamber 112. The control system 3 comprises a pilot valve assembly connected to the reversing valve assembly for delivering different pressures to the reversing valve assembly for controlling the first reversing valve 1 in the third state while the second reversing valve 2 is in the fifth state, the first reversing valve 1 in the second state while the second reversing valve 2 is in the fifth state, and the first reversing valve 1 in the first state while the second reversing valve 2 is in the fourth state.

Specifically, as shown in fig. 1 to 3, the first reversing valve 1 is in communication with the first chamber 111, the first liquid inlet 11 of the first reversing valve 1 in the first state is disconnected from the first chamber 111, the first liquid return port 12 is in communication with the first chamber 111, the first liquid inlet 11 of the first reversing valve 1 in the second state is partially in communication with the first chamber 111, the first liquid return port 12 is disconnected from the first chamber 111, the first liquid inlet 11 of the first reversing valve 1 in the third state is fully in communication with the first chamber 111, and the first liquid return port 12 is disconnected from the first chamber 111. The second reversing valve 2 is connected with the second chamber 112, the second liquid inlet 21 of the second reversing valve 2 in the fourth state is communicated with the second chamber 112, the second liquid return port 22 is disconnected from the second chamber 112, the second liquid inlet 21 of the second reversing valve 2 in the fifth state is disconnected from the second chamber 112, and the second liquid return port 22 is communicated with the second chamber 112.

When the first reversing valve 1 is in the first state, the first reversing valve 1 is in an inactive state, that is, the liquid return port of the first reversing valve 1 is in a liquid return state, the first liquid return port 12 is communicated with the first chamber 111, and the first working liquid in the first chamber 111 flows out from the first liquid return port 12 through the first reversing valve 1. When the first reversing valve 1 is in the second state, the first reversing valve 1 is in the working state, at this time, the first liquid inlet 11 is partially opened to enable the first reversing valve 1 to be in the liquid inlet state, a part of the first liquid inlet 11 is communicated with the first chamber 111, that is, the opening area of the first liquid inlet 11 is smaller than the area of the first liquid inlet 11, the first working liquid can enter the first chamber 111 through the first liquid inlet 11 at a small flow rate, and the first working liquid is the working liquid entering and exiting the first chamber 111. When the first reversing valve 1 is in the third state, the first reversing valve 1 is in the working state, all the first liquid inlet 11 is opened and communicated with the first chamber 111, that is, the opening area of the first liquid inlet 11 is equal to the area of the first liquid inlet 11, and the first working liquid can enter the first chamber 111 through the first liquid inlet 11 in a large flow rate.

For example, the liquid inlet area of the first liquid inlet 11 is S, the flow area of the first liquid inlet 11 is 0 when the first reversing valve 1 is in the first state, the flow area of the first liquid inlet 11 is smaller than the area of the first liquid inlet 11 when the first reversing valve 1 is in the second state, the flow area of the first liquid inlet 11 is greater than zero and smaller than the liquid inlet area, and may be 0.1S, 0.2S, 0.5S, 0.7S, 0.85S, or the like. When the first reversing valve 1 is in the third state, the flow area of the first liquid inlet 11 is equal to the area of the first liquid inlet 11, that is, the flow area of the first liquid inlet 11 is S, that is, the first reversing valve 1 switches between zero flow, small flow and full flow, that is, the first reversing valve 1 is a three-position three-way reversing valve, and the embodiment of the utility model is not limited to the specific structure of the first reversing valve 1, as long as the switching of the first reversing valve 1 between zero flow, the set small flow and the full flow can be realized.

When the second reversing valve 2 is in the fourth state, the second liquid inlet 21 is communicated with the second chamber 112, and at this time, the second reversing valve 2 is in a liquid inlet state, and the second working liquid can enter the second chamber 112 through the second liquid inlet 21. When the second reversing valve 2 is in the fifth state, the second liquid return port 22 is communicated with the second chamber 112, the second liquid inlet 21 is disconnected from the second chamber 112, at this time, the second reversing valve 2 is in the liquid return state, and the second working liquid in the second chamber 112 can flow out through the second liquid return port 22. The second working fluid is working fluid flowing into and out of the second chamber 112.

The first liquid inlet 11 and the second liquid inlet 21 may use the same pressure working liquid, that is, the first working liquid and the second working liquid have the same pressure, for example, the first working liquid and the second working liquid are the same working liquid. By controlling the first reversing valve 1 and the second reversing valve 2 in different states by the control system 3, the speed regulating electro-hydraulic reversing valve can be provided with the following three different working states, and the actuator 100 is explained below by the hydraulic cylinder 110.

It will be appreciated that the hydraulic cylinder 110 includes a cylinder barrel, a piston 113 and a piston rod 114, the piston 113 dividing the cylinder barrel into a first chamber 111 and a second chamber 112. The piston rod 114 is disposed in the second chamber 112 and is connected to the piston 113, the first chamber 111 is a rodless chamber, and the second chamber 112 is a rod-containing chamber.

The first working state of the speed-regulating electrohydraulic control reversing valve, the control system 3 controls the first reversing valve 1 to be in the first state and simultaneously controls the second reversing valve 2 to be in the fourth state, at the moment, the first reversing valve 1 is in the liquid return state, the first working liquid in the first chamber 111 flows out through the first liquid return port 12, the second reversing valve 2 is in the liquid inlet state, the second working liquid can enter the second chamber 112 through the second liquid inlet 21, so that the working pressure in the second chamber 112 is larger than the working pressure in the first chamber 111, further, the second working liquid in the second chamber 112 is applied to the thrust of the piston 113 towards the first chamber 111, the piston 113 moves towards the first chamber 111 under the action of the thrust, and the piston rod 114 is retracted.

In the second working state of the speed-regulating electrohydraulic control reversing valve, the control system 3 controls the first reversing valve 1 to be in the second state and simultaneously controls the second reversing valve 2 to be in the fifth state, at the moment, the first reversing valve 1 is in a low-flow liquid inlet state, the first working liquid enters the first chamber 111 through the first liquid inlet 11 at a low flow rate, the second reversing valve 2 is in a liquid return state, the second working liquid flows out of the second chamber 112 through the second liquid return port 22, so that the working liquid in the first chamber 111 applies thrust force to the piston 113 towards the second chamber 112, the piston 113 slowly moves towards the second chamber 112 under the thrust force, and the piston rod 114 slowly extends outwards.

In the third working state of the speed-regulating electrohydraulic control reversing valve, the control system 3 controls the first reversing valve 1 to be in the third state and simultaneously controls the second reversing valve 2 to be in the fifth state, at the moment, the first reversing valve 1 is in a full-flow liquid inlet state, the first working liquid enters the first chamber 111 through the first liquid inlet 11 at a large flow rate, the second reversing valve 2 is in a liquid return state, and the second working liquid flows out of the second chamber 112 through the second liquid return port 22, so that the working liquid in the first chamber 111 applies to the thrust of the piston 113 towards the second chamber 112, the piston 113 moves towards the second chamber 112 rapidly under the action of the thrust, the piston 113 in the third working state stretches out rapidly, and the thrust received by the piston 113 in the third working state is larger than the thrust received by the piston 113 in the second working state.

According to the speed-regulating electro-hydraulic reversing valve disclosed by the embodiment of the utility model, the control system 3 is used for switching among full-flow liquid inlet, small-flow liquid inlet and liquid return states and controlling the second reversing valve 2 to switch between a fourth state and a fifth state, so that the speed-regulating electro-hydraulic reversing valve can realize the three working states, namely, the first working state of the hydraulic cylinder 110 is retracted, the second working state of the hydraulic cylinder 110 is extended slowly at a small flow rate, the third working state of the hydraulic cylinder 110 is extended quickly at a full flow rate, and the control precision of the speed-regulating electro-hydraulic reversing valve is improved.

Compared with the arrangement mode of the speed-regulating electro-hydraulic control reversing valve external valve in the related art, the embodiment of the utility model does not need to be connected with a pipeline again by adjusting the working state of the second reversing valve 2 through the pilot valve assembly, and has the advantages of less change and lower change cost. In specific implementation, by reasonably designing the flow of the first reversing valve 1 in the second state, the extending speed of the hydraulic cylinder 110 in the second working state can be increased, so that the control precision of the position of the actuating element 100 is further realized, and the control precision of the speed-regulating electro-hydraulic reversing valve on the actuating element 100 is further improved.

In some embodiments, the number of reversing valve assemblies is multiple, the number of pilot valve assemblies is multiple, and the multiple pilot valve assemblies respectively control states of the multiple reversing valve assemblies to control the multiple actuators 100, which may be hydraulic cylinders or hydraulic motors.

Specifically, the pilot valve assemblies are arranged in one-to-one correspondence with the reversing valve assemblies, namely, one pilot valve assembly controls the working states of the reversing valve assemblies, and the speed-regulating electrohydraulic reversing valve provided by the embodiment of the utility model can control the working states of a plurality of groups of hydraulic cylinders simultaneously by integrating a plurality of pilot valve assemblies and a plurality of reversing valve assemblies into a cartridge valve group.

The embodiment of the utility model does not limit the number of the pilot valve assemblies and the number of the reversing valve assemblies, can be assembled and installed according to the requirements, and compared with the embodiment of the utility model in the related art, the reversing valve assemblies are in different working states by conveying different pressures to the reversing valve assemblies through the pilot valve assemblies, so that the switching of each executive element among three working states is realized, and the control precision of the speed-regulating electro-hydraulic control reversing valve is improved.

In some embodiments, the second reversing valve 2 has a second control port 23 and a second working port 24, the third reversing valve 31 has a third inlet port 311, a third return port 312, and a third working port 314, the second working port 24 communicates with the second chamber 112, the third working port 314 communicates with the second control port 23, the second reversing valve 2 is in a fourth state when the third working port 314 communicates with the third inlet port 311, and the second reversing valve 2 is in a fifth state when the third working port 314 communicates with the third return port 312.

Specifically, when the third working port 314 communicates with the third liquid inlet 311, the third reversing valve 31 is in a liquid inlet state to control the second reversing valve 2 to be in a fourth state, and when the third working port 314 communicates with the third liquid return port 312, the third reversing valve 31 is in a liquid return state to control the second reversing valve 2 to be in a fifth state.

When the third direction valve 31 is in the liquid-feeding state, the working liquid in the third direction valve 31 enters the second control port 23 through the third liquid-feeding port 311 and the third working port 314, the second direction valve 2 is controlled to be in the fourth state, the second working liquid flows into the second chamber 112 through the second liquid-feeding port 21 and the second working port 24, and the piston 113 moves towards the first chamber 111 under the action of the thrust force, and the piston rod 114 is retracted, because the first direction valve 1 is in the first state, i.e. the first direction valve 1 is in the liquid-returning state, the second working liquid in the second chamber 112 applies the thrust force to the piston 113 towards the first chamber 111.

When the third reversing valve 31 is in the liquid return state, the third working port 314 is communicated with the third liquid return port 312, the third working port 314 no longer provides control liquid to the second control port 23, the second reversing valve 2 is in the fifth state, the second working liquid in the second chamber 112 can flow out through the second working port 24 and the second liquid return port 22, at this time, the first reversing valve 1 is in the second state or the third state, and if the first reversing valve 1 is in the second state, the first liquid inlet 11 is partially communicated with the first chamber 111 to realize small flow liquid inlet of the first chamber 111, so that the working liquid in the first chamber 111 applies thrust force to the piston 113 towards the second chamber 112, the piston 113 slowly moves towards the second chamber 112 under the thrust force, and the piston rod 114 slowly extends outwards. If the first reversing valve 1 is in the third state at this time, the first reversing valve 1 is in the full-flow liquid-feeding state, the first working liquid enters the first chamber 111 through the first liquid inlet 11 and the first working port 14 at a large flow rate, the piston 113 moves rapidly toward the second chamber 112 under the thrust force, and the piston rod 114 extends out rapidly at a full flow rate.

According to the speed-regulating electro-hydraulic reversing valve, the initial states of the first reversing valve 1 and the second reversing valve 2 are in a liquid return state, the initial state of the third reversing valve 31 is a liquid inlet state, the state of the second reversing valve 2 is regulated by controlling the regulation of the state of the third reversing valve 31, a large flow rate is used when the hydraulic cylinder 110 needs to be rapidly stretched out, a small flow rate is used when the position needs to be accurately controlled, and the control precision of the speed-regulating electro-hydraulic reversing valve on the hydraulic cylinder 110 is improved by regulating the flow rate of the first reversing valve 1 and the working state of the second reversing valve 2.

In some embodiments, the speed regulating electro-hydraulic reversing valve further comprises a liquid inlet pipeline 4 and a liquid return pipeline 5, wherein the second liquid inlet port 21 is communicated with the liquid inlet pipeline 4, the second liquid return port 22 is communicated with the liquid return pipeline 5, the second working port 24 is communicated with the second liquid inlet port 21 in the fourth state, and the second working port 24 is communicated with the second liquid return port 22 in the fifth state.

Specifically, the second control port 23 is controlled by the third reversing valve 31 to switch the second reversing valve 2 between the fourth state and the fifth state, and when the second reversing valve 2 is in the fourth state, the second working port 24 is communicated with the second liquid inlet 21, and at this time, the second working liquid can flow into the second chamber 112 through the second liquid inlet 21 and the second working port 24; when the second reversing valve 2 is in the fifth state, the second working port 24 communicates with the second liquid return port 22, and at this time, the second working liquid in the second chamber 112 may flow out through the second working port 24 and the second liquid return port 22.

The second liquid inlet 21 is directly communicated with the liquid inlet pipeline 4, and the second liquid return port 22 is directly communicated with the liquid return pipeline 5, so that the on-off of the second reversing valve 2, the liquid inlet pipeline 4 and the liquid return pipeline 5 can be conveniently realized.

In some embodiments, the first reversing valve 1 has a first working port 14, the first working port 14 being in communication with the first chamber 111, the first inlet port 11 being in communication with the inlet line 4, the first return port 12 being in communication with the return line 5, the first working port 14 being in communication with the first return port 12 in the first state, the first working port 14 being in communication with a portion of the first inlet port 11 in the second state, the first working port 14 being in communication with all of the first inlet port 11 in the third state.

Specifically, the first working port 14 communicates with the first liquid return port 12, which means that the first liquid return port 12 is opened, the first chamber 111 communicates with the first liquid return port 12 through the first working port 14, and the first working liquid in the first chamber 111 flows out through the first liquid return port 12. The first working port 14 is partially communicated with the first liquid inlet 11, which is understood to be that the opening area of the first liquid inlet 11 is smaller than the area of the first liquid inlet 11, and at this time, the first working liquid can enter the first working port 14 with a small flow rate. All the first working ports 14 are communicated with the first liquid inlet 11, and it is understood that the opening area of the first liquid inlet 11 is the area of the first liquid inlet 11, and at this time, the first working liquid can enter the first working ports 14 in a large flow rate.

The first liquid inlet 11 is directly communicated with the liquid inlet pipeline 4, the first liquid return port 12 is directly communicated with the liquid return pipeline 5, and the on-off of the first reversing valve 1, the liquid inlet pipeline 4 and the liquid return pipeline 5 is conveniently realized.

In some embodiments, the control system 3 further comprises a first pilot valve 32, the first pilot valve 32 having a fourth inlet 321, a fourth return 322 and a fourth working port 323, the first reversing valve 1 having a first control port 13, the third reversing valve 31 having a third control port 313, the fourth inlet 321 being in communication with the inlet line 4, the fourth return 322 being in communication with the return line 5, the fourth working port 323 being in communication with the first control port 13 and the third control port 313, respectively, to place the first reversing valve 1 in the second state or the third state while placing the third working port 314 of the third reversing valve 31 in communication with the third return 312, and the third return 312 being in communication with the return line 5.

Specifically, when the first pilot valve 32 is opened, the fourth liquid inlet 321 is in communication with the liquid inlet pipeline 4, the first pilot valve 32 is in a liquid inlet state, the pilot liquid can enter the first pilot valve 32 through the fourth liquid inlet 321 and flow into the first control port 13 of the first reversing valve 1 and the third control port 313 of the third reversing valve 31 through the fourth working port 323, that is, the fourth working port 323 of the first pilot valve 32 is split into two paths, the first path flows to the first control port 13 to control the first reversing valve 1 to switch between the second state and the third state, the second path flows to the third control port 313 to control the third working port 314 of the third reversing valve 31 to communicate with the third liquid return port 312, so that the third reversing valve 31 is in a liquid return state, and the third working port 314 no longer provides control liquid to the second control port, so that the second reversing valve 2 is switched to the fifth state.

When the first pilot valve 32 is closed, the first pilot valve 32 is in a liquid return state, the fourth working port 323 is disconnected from the fourth liquid inlet 321, the fourth working port 323 is communicated with the fourth liquid return port 322, the control liquid in the first control port 13 flows into the first pilot valve 32 through the fourth working port 323 and flows out through the fourth liquid return port 322 so that the first reversing valve 1 is in a first state, meanwhile, the control liquid in the third control port 313 flows into the first pilot valve 32 through the fourth working port 323 and flows out through the fourth liquid return port 322, and the third reversing valve 31 is in a liquid inlet state.

According to the speed-regulating electro-hydraulic reversing valve provided by the embodiment of the utility model, the first pilot valve 32 is arranged to control the first reversing valve 1 in the first state, the second state and the third state, and meanwhile, the liquid inlet state and the liquid return state of the third reversing valve 31 are controlled by the first pilot valve 32, so that the second reversing valve 2 is controlled in the fifth state and the sixth state, and the speed-regulating electro-hydraulic reversing valve provided by the embodiment of the utility model is simple in structure and more convenient to regulate.

For example, the first pilot valve 32 is an electromagnetic pilot valve.

In some embodiments, the control system 3 further comprises a second pilot valve 33, the second pilot valve 33 having a fifth inlet 331, a fifth return 332 and a fifth working 333, the fifth inlet 331 being in communication with the inlet line 4, the fifth return 332 being in communication with the return line 5, the fifth working 333 being in communication with the third inlet 311.

Specifically, when the second pilot valve 33 is opened, the fifth working port 333 is communicated with the fifth liquid inlet 331, the fifth liquid inlet 331 is communicated with the liquid inlet pipeline 4, the pilot liquid enters the second pilot valve 33 through the fifth liquid inlet 331 and flows out through the fifth working port 333, and when the first pilot valve 32 is closed so that the third reversing valve 31 is in a liquid inlet state, the pilot liquid flowing out of the fifth working port 333 is transmitted to the third reversing valve through the third liquid inlet and is transmitted to the second control port through the third working port to control the second reversing valve to be in a fourth state. In the fourth state of the second reversing valve, the second liquid inlet 21 communicates with the liquid inlet pipe 4, and the second working liquid flows into the second chamber 112 via the second liquid inlet 21 and the second working inlet 24.

When the second pilot valve 33 is closed, the fifth liquid inlet 331 is disconnected from the fifth working port 333, the fifth liquid return port 332 is connected to the fifth working port 333, the second pilot valve 33 is in a liquid return state, the fifth liquid return port 332 is connected to the liquid return pipeline 5, at this time, the working liquid in the third reversing valve 31 flows out through the third liquid return port 312, the third liquid return port 312 is connected to the liquid return pipeline 5, and the control liquid in the second control port 23 of the second reversing valve 2 flows out through the third working port 314 and the third liquid return port 312 of the third reversing valve 31, so that the third reversing valve 31 is in a liquid return state, and the second reversing valve 2 is in a fifth state.

Therefore, the second pilot valve 33 and the third reversing valve 31 are arranged to control the second reversing valve 2 to switch between the fourth state and the fifth state, so that the regulation control of the speed regulating electro-hydraulic reversing valve is more accurate and convenient.

For example, the second pilot 33 is an electromagnetic pilot.

In some embodiments, the control system 3 further includes a relief check valve 34, the relief check valve 34 having a first inlet 341 and a first outlet 342, the first inlet 341 being in communication with the fourth working port 323, the first control port 13, and the third control port 313, the first outlet 342 being in communication with the fifth working port 333 and the third inlet 311.

Specifically, the pilot liquid flowing out of the fourth working port 323 of the first pilot valve 32 is divided into three paths, the first path flows to the first control port 13 to control the first directional valve 1 to switch between the second state and the third state, the second path flows to the third control port 313 to control the third directional valve 31 to be in the liquid return state, and the third path flows to the first inlet 341 of the one-way relief valve 34 to regulate the pressure flowing to the first control port 13 of the first directional valve 1.

The pilot fluid flowing out from the fifth working port 333 of the second pilot valve 33 is divided into two paths, the fourth path flows to the first outlet 342, the fifth path flows to the third liquid inlet 311 of the third reversing valve 31 to enter the third reversing valve 31, the control liquid is conveyed to the second control port 23 through the third working port 314 of the third reversing valve 31, the pressure flowing to the first control port 13 is controlled by arranging the one-way overflow valve 34 so as to realize the adjustment of the flow passing through the first reversing valve 1, and the control precision of the speed-regulating electrohydraulic control reversing valve is further improved.

When the speed-regulating electro-hydraulic reversing valve in the embodiment of the utility model needs to be in the first working state, the second pilot valve 33 is opened, the first pilot valve 32 is closed, the fourth working port 323 is communicated with the fourth liquid return port 322, the fourth liquid return port 322 is communicated with the liquid return pipeline 5, the control liquid of the first control port 13 and the control liquid of the third control port 313 flow back to the liquid return pipeline 5 through the fourth working port 323 and the fourth liquid return port 322, the first reversing valve 1 is in the first state, and the third reversing valve 31 is in the liquid inlet state. The second pilot valve 33 is opened, the pilot liquid enters the second pilot valve 33 through the fifth liquid inlet 331 and flows out through the fifth working port 333, the pressure of the pilot liquid is set to be P0, the pilot liquid flowing out through the fifth working port 333 cannot flow from the first outlet 342 of the one-way overflow valve 34 to the first inlet 341 of the one-way overflow valve 34, therefore, the one-way overflow valve 34 does not work, the pressure of the pilot liquid cannot be influenced, the pressure of the pilot liquid flowing into the third liquid inlet 311 through the fifth working port 333 is kept at P0 and flows into the second control port 23 through the third working port 314, the second reversing valve 2 is opened at full flow, the second liquid inlet 21 of the second reversing valve 2 is communicated with the liquid inlet pipeline 4, the second reversing valve 2 is in a fourth state, and the piston rod 114 of the hydraulic cylinder 110 is retracted inwards.

When the speed-regulating electro-hydraulic reversing valve of the embodiment of the utility model needs to be in the second working state, the first pilot valve 32 is opened, the second pilot valve 33 is closed at the same time, the first pilot valve 32 is opened, the pilot liquid enters the first pilot valve 32 through the fourth liquid inlet 321 and flows out through the fourth working port 323, wherein a first part of the pilot liquid flows into the one-way overflow valve 34 through the first inlet 341 and flows out through the first outlet 342, and because the second pilot valve 33 is in the closed state, the pilot liquid flowing out of the first outlet 342 flows into the second pilot valve 33 through the fifth working port 333 and flows back into the liquid return pipeline 5 through the fifth liquid return port 332; the second part of pilot liquid enters the first reversing valve 1 through the first control port 13 to form a first reversing valve 1 control liquid, the pressure of the pilot liquid flowing into the first control port 13 is smaller than the pressure P0 of the pilot liquid under the partial pressure action of the one-way overflow valve 34, the pressure on the left side is controlled within a preset pressure value range under the pressure control action of the one-way overflow valve 34, the first liquid inlet 11 is communicated with the liquid inlet pipeline 4, the first working port 14 is partially communicated with the first chamber 111, and the first reversing valve 1 is in a second state; the third part of pilot liquid enters the third reversing valve 31 through the third control port 313 to form a third reversing valve 31 control liquid, and under the partial pressure action of the one-way overflow valve 34, the pilot liquid flowing into the third control port 313 can push the third reversing valve 31 to reverse, namely, the pilot liquid under the partial pressure action of the one-way overflow valve 34 is higher than the control pressure of the third reversing valve 31, the initial state of the third reversing valve 31 is a liquid inlet state, and the pilot liquid is changed into a liquid return state after reversing under the action of the first pilot valve 32, the third reversing valve 31 does not provide the control liquid for the second reversing valve 2 any more, so that the second reversing valve 2 is in a fifth state, and the piston rod 114 slowly extends.

When the speed-regulating electro-hydraulic reversing valve in the embodiment of the utility model needs to be in the third working state, the first pilot valve 32 and the second pilot valve 33 are opened at the same time, the pilot liquid of the first pilot valve 32 enters the first control port 13 and the third control port 313, the pilot liquid of the second pilot valve 33 enters the third liquid inlet 311, the first inlet 341 of the one-way overflow valve 34 is communicated with the fourth working port 323, the first control port 13 and the third control port 313, the first outlet 342 is communicated with the fifth working port 333 and the third liquid inlet 311, so that the pressures of the pilot liquid at the two ends of the first inlet 341 and the first outlet 342 of the one-way overflow valve 34 are the same, the one-way overflow valve 34 is in the non-working state, the pressure of the pilot liquid flowing to the first control port 13 from the fourth working port 323 is kept at P0, so that the first reversing valve 1 is in the third state, and the pilot liquid of the fourth working port 323 enters the third control port 313, so that the third reversing valve 31 is in the liquid returning state, the third reversing valve 31 is not in the fast reversing valve 2 is in the fast reversing valve 114, and the second reversing valve 2 is not provided to the reversing valve 2.

Therefore, the speed-regulating electrohydraulic control reversing valve controls the opening area of the first liquid inlet 11 by controlling the control liquid with different pressures entering the first control port 13, realizes zero flow, small flow and full flow liquid inlet of the first liquid inlet 11, so that the flow regulation of the first reversing valve 1 is more convenient, meanwhile, as long as the first pilot valve 32 is opened, the third reversing valve 31 is in a setting mode of a liquid return state, and the liquid return state of the third reversing valve 31 cannot provide control liquid for the second reversing valve 2 so that the second reversing valve 2 is in a fifth state, and can be switched in a regulating mode of a fourth state only when the second reversing valve 2 is independently opened and the first reversing valve 1 is closed, so that three working states of the speed-regulating electrohydraulic control reversing valve can be switched.

When the first pilot valve 32 and the second pilot valve 33 are opened simultaneously, the first pilot valve 32 controls the third control port 313 of the third reversing valve 31, so that the third working port 314 is communicated with the third liquid return port 312, the third liquid inlet 311 is disconnected from the third working port 314, the second pilot valve 33 controls the third liquid inlet 311 of the third reversing valve 31, the third reversing valve 31 controls the second control port 23 of the second reversing valve 2, and the pilot liquid flowing out of the fifth working port 333 of the second pilot valve 33 cannot enter the third liquid inlet 311 of the third reversing valve 31 and cannot flow to the second control port 23 of the second reversing valve 2 through the third working port 314, that is, as long as the first pilot valve 32 is opened, the third reversing valve 31 is in a liquid return state no matter whether the second pilot valve 33 is in an opened state or a closed state, so that the second reversing valve 2 is in a fifth state.

Further, by arranging the one-way overflow valve 34 to divide the pressure entering the first control port 13, the three working states can be switched by only controlling the on-off of the first pilot valve 32 and the second pilot valve 33, so that the speed-regulating electro-hydraulic control reversing valve provided by the embodiment of the utility model has a simple structure and is convenient to control and regulate.

In some embodiments, the control system 3 further comprises a controller 35, the controller 35 being connectable to the first pilot valve 32 such that the fourth working port 323 is in communication with the fourth liquid inlet 321, and the fourth working port 323 is in communication with the fourth liquid return port 322 when the controller 35 is disconnected from the first pilot valve 32; and/or the controller 35 may be connected to the second pilot valve 33 such that the fifth working port 333 communicates with the fifth inlet port 331, and the fifth working port 333 communicates with the fifth return port 332 when the controller 35 is disconnected from the second pilot valve 33.

Specifically, the controller 35 is electrically connected to the first pilot valve 32, when the controller 35 is in communication with the first pilot valve 32, the first pilot valve 32 is in a liquid-feeding state, and when the second pilot valve 33 is closed, the pressure entering the first control port 13 via the first pilot valve 32 is smaller than the pressure of the liquid-feeding pipeline 4 due to the partial pressure of the one-way overflow valve 34, the first reversing valve 1 is started in a second state in a small flow manner, meanwhile, the third reversing valve 31 is in a liquid-returning state, and the second reversing valve 2 is in a fifth state. When the controller 35 is disconnected from the first pilot valve 32, the first pilot valve 32 is in a liquid return state.

The controller 35 is electrically connected with the second pilot valve 33, when the controller 35 is communicated with the second pilot valve 33, the second pilot valve 33 is in a liquid inlet state, and when the first pilot valve 32 is opened, the second pilot valve 33 plays a role in keeping the same pressure of the first inlet 341 and the first outlet 342 of the one-way overflow valve 34, so that the pressure entering the first control port 13 through the first pilot valve 32 is ensured to be the same as the pressure of the liquid inlet pipeline 4, and the first reversing valve 1 is started in a third state at a large flow rate; when the second pilot valve 33 is opened and the first pilot valve 32 is closed, the third reversing valve 31 is in a liquid inlet state, and the pilot liquid flowing out of the second pilot valve 33 flows to the second control port 23 through the third reversing valve to control the second reversing valve 2 to be in a fourth state, so that the hydraulic cylinder 110 is retracted. When the controller 35 is disconnected from the second pilot valve 33, the second pilot valve 33 is in a liquid return state.

In some embodiments, the control system 3 further comprises a first one-way valve 36, the first one-way valve 36 being provided on the feed line 4; and/or, a second one-way valve 37, the second one-way valve 37 being arranged on the liquid return line 5; and/or a filter 38, the filter 38 being provided on the feed line 4.

Specifically, the working fluid in the liquid inlet pipeline 4 flows into the first pilot valve 32 and the second pilot valve 33 through the first check valve 36, so that the back flow of the pilot fluid in the first pilot valve 32 and the second pilot valve 33 into the liquid inlet pipeline 4 can be effectively prevented, the pollution to the working fluid in the liquid inlet pipeline 4 is caused, and the working reliability of the embodiment of the utility model is improved.

The control liquid flowing out of the first pilot valve 32 and the second pilot valve 33 and the reflux liquid flowing out of the third reversing valve 31 flow to the reflux pipeline 5 through the second one-way valve 37, so that the working liquid in the reflux pipeline 5 can be effectively prevented from flowing back into the first pilot valve 32 and the second pilot valve 33, and the working reliability of the embodiment of the utility model is further improved.

The working fluid flowing out of the first check valve 36 is filtered by the filter 38 and then enters the first pilot valve 32 and the second pilot valve 33 respectively, and impurities in the working fluid in the liquid inlet pipeline 4 can be effectively prevented from blocking the first pilot valve 32 or the second pilot valve 33 by arranging the filter 38 to filter the working fluid in the liquid inlet pipeline 4, so that the working reliability of the embodiment of the utility model is further improved.

It is to be understood that the specific structures of the first reversing valve 1, the second reversing valve 2, the third reversing valve 31, the first pilot valve 32, the second pilot valve 33, the one-way overflow valve 34, the first one-way valve 36, the second one-way valve 37 and the filter 38 are not limited in this embodiment of the present utility model, wherein the third reversing valve 31 is a normally open two-position three-way valve, and the second reversing valve 2 is a normally closed two-position three-way valve, so long as the functional symbols of the embodiment of the present utility model are met to satisfy the functions of the embodiment of the present utility model, which belongs to the protection scope of the embodiment of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

It will be appreciated that the above embodiments are exemplary and are not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A speed regulating electro-hydraulic reversing valve comprising:

A valve body;

A reversing valve assembly disposed within the valve body, the reversing valve assembly including a first reversing valve having a first fluid inlet and a first fluid return, the first reversing valve being switchable between a first state in which the first fluid return is adapted to communicate with a first chamber of an actuator, a second state in which a portion of the first fluid inlet is in communication with the first chamber, and a third state in which all of the first fluid inlet is in communication with the first chamber, and a second reversing valve having a second fluid inlet and a second fluid return, the second reversing valve being switchable between a fourth state in which the second fluid inlet is in communication with a second chamber of the actuator, and a fifth state in which the second fluid return is in communication with the second chamber;

The control system comprises a pilot valve assembly, wherein the pilot valve assembly is connected with the reversing valve assembly to convey different pressures to the reversing valve assembly, so that the first reversing valve is controlled to be in a third state, the second reversing valve is controlled to be in a fifth state, the first reversing valve is controlled to be in the second state, the second reversing valve is controlled to be in the fifth state, and the first reversing valve is controlled to be in the first state, and the second reversing valve is controlled to be in the fourth state.

2. The speed governing electro-hydraulic reversing valve of claim 1, wherein the number of reversing valve assemblies is a plurality, the number of pilot valve assemblies is a plurality, and the plurality of pilot valve assemblies respectively control states of the plurality of reversing valve assemblies to control the plurality of actuators.

3. The speed regulating electro-hydraulic reversing valve of claim 2, wherein the pilot valve assembly includes a third reversing valve having a second control port and a second working port, the third reversing valve having a third inlet port, a third return port, and a third working port, the second working port in communication with the second chamber, the third working port in communication with the second control port, the second reversing valve in a fourth state when the third working port is in communication with the third inlet port, and the second reversing valve in a fifth state when the third working port is in communication with the third return port.

4. The speed governing electro-hydraulic reversing valve of claim 3, further comprising a liquid inlet line and a liquid return line, wherein the second liquid inlet port is in communication with the liquid inlet line, the second liquid return port is in communication with the liquid return line, the second working port is in communication with the second liquid inlet port in the fourth state, and the second working port is in communication with the second liquid return port in the fifth state.

5. The speed governing electro-hydraulic reversing valve of claim 4, wherein the first reversing valve has a first working port that communicates with the first chamber, the first fluid inlet communicates with the fluid inlet line, the first fluid return port communicates with the fluid return line, the first working port communicates with the first fluid return port in the first state, the first working port communicates with a portion of the first fluid inlet port in the second state, and the first working port communicates with all of the first fluid inlet port in the third state.

6. The speed governing electro-hydraulic reversing valve of claim 5, wherein the control system further comprises a first pilot valve having a fourth inlet port, a fourth return port, and a fourth working port, the first reversing valve having a first control port, the third reversing valve having a third control port, the fourth inlet port in communication with the inlet line, the fourth return port in communication with the return line, the fourth working port in communication with the first control port and the third control port, respectively, to place the first reversing valve in a second state or a third state while placing the third working port of the third reversing valve in communication with the third return line, and the third return port in communication with the return line.

7. The speed governing electro-hydraulic reversing valve of claim 6, wherein the control system further comprises a second pilot valve having a fifth inlet port in communication with the inlet line, a fifth return port in communication with the return line, and a fifth working port in communication with the third inlet port.

8. The speed governing electro-hydraulic reversing valve of claim 7, wherein the control system further includes a one-way overflow valve having a first inlet in communication with the fourth working port, the first control port, and the third control port, and a first outlet in communication with the fifth working port and the third liquid inlet.

9. The speed governing electro-hydraulic reversing valve of claim 8, wherein the control system further includes a controller connectable to the first pilot valve to communicate the fourth working port with the fourth liquid inlet and to communicate the fourth working port with the fourth liquid return port when the controller is disconnected from the first pilot valve; and/or the number of the groups of groups,

The controller can be connected with the second pilot valve so that the fifth working port is communicated with the fifth liquid inlet, and when the controller is disconnected with the second pilot valve, the fifth working port is communicated with the fifth liquid return port.

10. The speed governing electro-hydraulic reversing valve of any one of claims 4-9, wherein the control system further comprises: the first one-way valve is arranged on the liquid inlet pipeline; and/or the number of the groups of groups,

The second one-way valve is arranged on the liquid return pipeline; and/or the number of the groups of groups,

The filter is arranged on the liquid inlet pipeline.