Three-position four-way proportional valve and hydraulic support group control system

Abstract

The present application relates to the technical field of hydraulic control and discloses a three-position four-way proportional valve and a hydraulic support group control system, the three-position four-way proportional valve comprising a valve body and at least four valve core assemblies, the valve body having an A port, a B port, a T port, a P port and at least four main valve core cavities, the at least four main valve core cavities being spaced apart from each other, the valve core assemblies corresponding to the main valve core cavities one by one, the valve core assembly comprising a main valve core movably extending into the main valve core cavity in the length direction of the main valve core cavity and a pilot valve core movably arranged on the main valve core, the pilot valve core of the first valve core assembly and the pilot valve core of the fourth valve core assembly moving simultaneously, the pilot valve core of the second valve core assembly and the pilot valve core of the third valve core assembly moving simultaneously. The three-position four-way proportional valve of the present application has high control precision and few control points, and can also realize stepless proportional regulation of the flow of liquid.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, specifically to a three-position four-way proportional valve and hydraulic support group control system. Background Technology

[0002] The coal mining face consists of multiple hydraulic supports arranged sequentially, each connected to the chute by a jack. Besides supporting the roof of the working face, the hydraulic supports can also be moved and the chute pushed. For the normal operation of the working face, the hydraulic supports across the multiple faces need to maintain a certain degree of straightness. During coal mining, the chute serves as the track for the coal mining machine and needs to maintain a certain degree of straightness to achieve good coal cutting results and ensure the working face is essentially flat.

[0003] In related technologies, most push hydraulic cylinders use time-controlled switching valves or multi-stage speed control valves to achieve position control. How to improve the precise control of push hydraulic cylinders is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a three-position four-way proportional valve and a hydraulic support group control system. The three-position four-way proportional valve offers high control accuracy and fewer control points, and can also achieve stepless proportional regulation of liquid flow.

[0005] The three-position four-way proportional valve of the present invention includes a valve body and at least four valve core assemblies. The valve body has an A port, a B port, a T port, a P port and at least four main valve core cavities, which are spaced apart from each other.

[0006] The valve core assembly corresponds one-to-one with the main valve core cavity. The valve core assembly includes a main valve core that extends movably into the main valve core cavity along its length and a pilot valve core that is movably disposed on the main valve core. The pilot valve core can drive the main valve core to move relative to the valve body. The at least four valve core assemblies include a first valve core assembly that adjusts the opening between port A and port P, a second valve core assembly that adjusts the opening between port B and port P, a third valve core assembly that adjusts the opening between port A and port T, and a fourth valve core assembly that adjusts the opening between port B and port T.

[0007] The pilot valve core of the first valve core assembly and the pilot valve core of the fourth valve core assembly move simultaneously, as do the pilot valve core of the second valve core assembly and the pilot valve core of the third valve core assembly.

[0008] The three-position four-way proportional valve of this invention can control the main valve core through a pilot valve core, thereby precisely controlling the displacement of the main valve core. This ensures smoother start-up and shutdown of the main valve core and prevents fluctuations or impacts in the liquid flow rate when the main valve core regulates it. Simultaneously, during the displacement process, the pilot valve core controls the main valve core, ensuring stable movement and preventing reciprocating motion. This ensures stepless proportional regulation of the liquid flow rate and improves the main valve core's resistance to disturbances. Furthermore, simultaneously controlling the first and fourth valve core assemblies allows for simultaneous adjustment of the opening between ports A and P, and between ports B and T. Similarly, simultaneously controlling the pilot valve core of the second valve core assembly and the third valve core assembly allows for simultaneous adjustment of the opening between ports B and P, and between ports A and T.

[0009] Optionally, the three-position four-way proportional valve has a first state, a second state, and a third state;

[0010] In the first state, the opening between port A and port P is zero, the opening between port B and port P is zero, the opening between port A and port T is zero, and the opening between port B and port T is zero.

[0011] In the second state, the opening degree between port A and port P is zero, the opening degree between port B and port P is greater than zero, the opening degree between port A and port T is greater than zero, and the opening degree between port B and port T is zero.

[0012] In the third state, the opening degree between port A and port P is greater than zero, the opening degree between port B and port P is equal to zero, the opening degree between port A and port T is equal to zero, and the opening degree between port B and port T is greater than zero.

[0013] Optionally, the main valve core cooperates with the main valve core cavity to define a first control cavity communicating with the P port, a second control cavity communicating with the P port, and a return fluid cavity communicating with the T port, which are spaced apart. The first control cavity and the second control cavity are arranged opposite to each other in the length direction of the main valve core cavity; and / or

[0014] The main valve core has an adjusting shoulder for adjusting the opening between port A and port P, the opening between port B and port P, the opening between port A and port T, or the opening between port B and port T. The valve body has a first port and a second port located on both sides of the adjusting shoulder along the length direction of the main valve core cavity. The first port and the second port are respectively connected to the main valve core cavity. Each main valve core cavity corresponds to one first port and one second port. When the main valve core moves relative to the valve body, the adjusting shoulder can adjust the opening between the first port and the second port.

[0015] The first port corresponding to the first valve core assembly is connected to the P port, and the second port corresponding to the first valve core assembly is connected to the A port;

[0016] The first port corresponding to the second valve core assembly is connected to the P port, and the second port corresponding to the second valve core assembly is connected to the B port;

[0017] The first port corresponding to the third valve core assembly is connected to the T port, and the second port corresponding to the third valve core assembly is connected to the A port;

[0018] The first port corresponding to the fourth valve core assembly is connected to the T port, and the second port corresponding to the fourth valve core assembly is connected to the B port.

[0019] Optionally, a first damper is provided on the communication channel between the first control cavity and the P port; and / or

[0020] A second damper is provided on the communication channel between the second control cavity and the P port.

[0021] Optionally, the main valve core has a pilot valve core cavity extending along the length direction of the main valve core cavity. The main valve core is provided with a first pressure relief channel communicating with the first control cavity, a second pressure relief channel communicating with the second control cavity, and a return channel communicating with the return liquid cavity. The first pressure relief channel, the second pressure relief channel, and the return liquid channel are respectively connected to the pilot valve core cavity.

[0022] Optionally, the pilot valve core is movably extended into the main valve core cavity along its length, and the pilot valve core is provided with a first shoulder for adjusting the opening of the first pressure relief channel and a second shoulder for adjusting the opening of the second pressure relief channel in opposite directions along the length of the main valve core cavity.

[0023] Optionally, the three-position four-way proportional valve further includes:

[0024] At least two drive components are provided on the valve body, each drive component being connected to at least two valve core assemblies to simultaneously drive the at least two valve core assemblies. The at least two drive components include a first drive component that simultaneously drives the pilot valve core of the first valve core assembly and the pilot valve core of the fourth valve core assembly, and a second drive component that simultaneously drives the pilot valve core of the second valve core assembly and the pilot valve core of the third valve core assembly.

[0025] Optionally, the driving component includes:

[0026] An electric motor is mounted on the valve body and has an output shaft;

[0027] A main drive component, which is rotatably mounted on the valve body and connected to the output shaft;

[0028] A first transmission member is rotatably mounted on the valve body. The first transmission member is connected to the main transmission member. The first transmission member is also connected to the pilot valve core of the first valve core assembly or to the pilot valve core of the second valve core assembly.

[0029] The second transmission component is rotatably mounted on the valve body and is connected to the main transmission component. The second transmission component is also connected to the pilot valve core of the fourth valve core assembly or to the pilot valve core of the third valve core assembly.

[0030] Optionally, the main transmission component, the first transmission component, and the second transmission component are all transmission gears;

[0031] The transmission ratio between the main transmission component and the first transmission component may be the same as or different from the transmission ratio between the main transmission component and the second transmission component.

[0032] Optionally, the valve body includes a first sub-valve body corresponding to the first valve core assembly, a second sub-valve body corresponding to the second valve core assembly, a third sub-valve body corresponding to the third valve core assembly, and a fourth sub-valve body corresponding to the fourth valve core assembly;

[0033] The first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body are integrated; or at least one of the first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body is an independent sub-valve body.

[0034] Optionally, the at least four main valve core cavities include a first main valve core cavity corresponding to the first valve core assembly, a second main valve core cavity corresponding to the second valve core assembly, a third main valve core cavity corresponding to the third valve core assembly, and a fourth main valve core cavity corresponding to the fourth valve core assembly;

[0035] At least two of the first main valve core cavity, the second main valve core cavity, the third main valve core cavity, and the fourth main valve core cavity are parallel to each other in their length directions; and / or

[0036] The first main valve core cavity and the second main valve core cavity are connected, and / or the third main valve core cavity and the fourth main valve core cavity are connected; and / or

[0037] The axis of the first main valve core cavity is collinear with the axis of the second main valve core cavity and / or the axis of the third main valve core cavity is collinear with the axis of the fourth main valve core cavity.

[0038] The hydraulic support group control system of the present invention includes multiple three-position four-way proportional valves, multiple hydraulic cylinders and a controller, wherein the three-position four-way proportional valves are the three-position four-way proportional valves described above.

[0039] Multiple hydraulic cylinders, each corresponding to a three-position four-way proportional valve, wherein the plug chamber of each hydraulic cylinder is connected to port A, and the rod chamber of each hydraulic cylinder is connected to port B;

[0040] A controller, which is electrically connected to a plurality of the three-position four-way proportional valves. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a three-position four-way proportional valve according to an embodiment of the present invention.

[0042] Figure 2 This is another schematic diagram of a three-position four-way proportional valve according to an embodiment of the present invention.

[0043] Figure 3 This is a schematic diagram of the valve core assembly of a three-position four-way proportional valve according to an embodiment of the present invention.

[0044] Figure 4 This is another schematic diagram of the valve core assembly of the three-position four-way proportional valve according to an embodiment of the present invention.

[0045] Figure 5 This is a three-dimensional schematic diagram of the valve core assembly of a three-position four-way proportional valve according to an embodiment of the present invention.

[0046] Figure 6 This is a schematic diagram of the hydraulic support group control system according to an embodiment of the present invention.

[0047] Reference numerals: 1000-Three-position four-way proportional valve, 2000-Hydraulic cylinder, 2001-Plug chamber, 2002-Rod chamber, 3000-Controller;

[0048] 100-Valve body, 100a-Body body, 100b-End cap, 110-Main valve core cavity, 110a-First main valve core cavity, 110b-Second main valve core cavity, 110c-Third main valve core cavity, 110d-Fourth main valve core cavity, 111-First control cavity, 111a-First damper, 112-Second control cavity, 112a-Second damper, 113-Return cavity, 114-First port, 115-Second port;

[0049] 200-Valve core assembly, 200a-First valve core assembly, 200b-Second valve core assembly, 200c-Third valve core assembly, 200d-Fourth valve core assembly, 210-Main valve core, 211-Adjusting shoulder, 212-Pilot valve core cavity, 213-First pressure relief channel, 214-Second pressure relief channel, 215-Return channel, 220-Pilot valve core, 221-First shoulder, 222-Second shoulder, 223-External thread, 224-Glyd ring;

[0050] 300-Drive assembly, 300a-First drive assembly, 300b-Second drive assembly, 310-Motor, 320-Main transmission component, 330-First transmission component, 340-Second transmission component;

[0051] 400 - threaded sleeve, 410 - threaded hole;

[0052] 500 - Reset assembly, 510 - Reset base, 520 - Elastic part;

[0053] AA port, BB port, TT port, PP port; Detailed Implementation

[0054] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] The following description, with reference to the accompanying drawings, describes an embodiment of the three-position four-way proportional valve 1000 of the present invention. Figures 1-4 As shown, the three-position four-way proportional valve 1000 of this embodiment includes a valve body 100 and at least four valve core assemblies 200.

[0056] The valve body 100 has an A port, a B port, a T port, a P port, and at least four main valve core chambers 110, which are spaced apart from each other.

[0057] At least four valve core assemblies 200 are provided, each corresponding to a main valve core cavity 110. Each valve core assembly 200 includes a main valve core 210 movably extending into the main valve core cavity 110 along its length and a pilot valve core 220 movably disposed on the main valve core 210. The pilot valve core 220 can drive the main valve core 210 to move relative to the valve body 100. The at least four valve core assemblies 200 include a first valve core assembly 200a that adjusts the opening between port A and port P, a second valve core assembly 200b that adjusts the opening between port B and port P, a third valve core assembly 200c that adjusts the opening between port A and port T, and a fourth valve core assembly 200d that adjusts the opening between port B and port T.

[0058] The pilot valve core 220 of the first valve core assembly 200a and the pilot valve core 220 of the fourth valve core assembly 200d move simultaneously, as do the pilot valve core 220 of the second valve core assembly 200b and the pilot valve core 220 of the third valve core assembly 200c.

[0059] The three-position four-way proportional valve 1000 of this embodiment can control the main valve core 210 through the pilot valve core 220, thereby precisely controlling the displacement of the main valve core 210. This ensures smoother start-up and shutdown of the main valve core 210 and prevents fluctuations or impacts in the liquid flow rate when the main valve core 210 adjusts it. Simultaneously, during the displacement process, the pilot valve core 220 controls the main valve core 210, ensuring stable movement and preventing reciprocating motion. This ensures stepless proportional adjustment of the liquid flow rate and improves the main valve core 210's resistance to disturbances. Furthermore, simultaneously controlling the first valve core assembly 200a and the fourth valve core assembly 200d allows for simultaneous adjustment of the opening between ports A and P, and between ports B and T. Simultaneously controlling the pilot valve core 220 of the second valve core assembly 200b and the third valve core assembly 200c, the opening between port B and port P and the opening between port A and port T can be adjusted simultaneously.

[0060] The following describes some specific embodiments of the three-position four-way proportional valve 1000 of the present invention. It should be noted that the length direction of the main valve core cavity 110 can be aligned with... Figure 1 The left and right directions are consistent.

[0061] In some specific embodiments, such as Figures 1 to 6 As shown, the three-position four-way proportional valve 1000 has a first state, a second state, and a third state.

[0062] In the first state, the opening degree between ports A and P is zero, the opening degree between ports B and P is zero, the opening degree between ports A and T is zero, and the opening degree between ports B and T is zero. That is to say, ports A and B are not connected to ports P, and ports A and B are also not connected to ports T.

[0063] In the second state, the opening degree between port A and port P is zero, the opening degree between port B and port P is greater than zero, the opening degree between port A and port T is greater than zero, and the opening degree between port B and port T is zero. That is, port A and port T are connected, and simultaneously, port B and port P are connected. Pressurized fluid can flow from port P to port B, and fluid from port A can flow back to port T.

[0064] In the third state, the opening degree between port A and port P is greater than zero, the opening degree between port B and port P is zero, the opening degree between port A and port T is zero, and the opening degree between port B and port T is greater than zero. That is, port A and port P are connected, and simultaneously, port B and port T are connected. Pressurized fluid can flow from port P into port A, and fluid from port B can flow back to port T.

[0065] It should be noted that the opening degree in this embodiment of the invention can be understood as a percentage of the liquid flow rate. When the opening degree is zero, the two ports are not connected, and liquid cannot flow between them. When the opening degree is greater than zero, the two ports are connected, and liquid can flow between them. Simultaneously, a change in the opening degree between the two ports will change the flow rate of the liquid passing through them. That is, the larger the opening degree, the greater the flow rate of liquid passing through the two ports.

[0066] In some specific embodiments, such as Figures 1 to 6 As shown, the valve body 100 has port A, port B, port T, port P, and at least four main valve core chambers 110, wherein ports A and B are inlet ports, port T is return port, and port P is pressure port. The main valve core chambers 110 can be used to install the valve core assembly 200. The at least four main valve core chambers 110 are spaced apart from each other, that is, the main valve core chambers 110 are separate from each other.

[0067] In some embodiments, such as Figures 1 to 6As shown, the valve body 100 has a first port 114 and a second port 115 located on both sides of the adjusting shoulder 211 along the length (left-right direction) of the main valve core cavity 110. The first port 114 and the second port 115 are respectively connected to the main valve core cavity 110, for example, port A and port P are connected, and liquid can flow sequentially from port P, the first port 114, the first main valve core cavity 110a, the second port 115, and port A. At the same time, by changing the position of the adjusting shoulder 211, the first port 114 and the second port 115 can be connected or disconnected, that is, liquid can flow between the first port 114 and the second port 115 or liquid can flow between the first port 114 and the second port 115. In addition, by precisely controlling the position of the adjusting shoulder 211, the flow rate of liquid between the first port 114 and the second port 115 can be adjusted.

[0068] Furthermore, in this embodiment of the invention, each main valve core cavity 110 corresponds to a first port 114 and a second port 115.

[0069] In some embodiments, such as Figures 1 to 6 As shown, the valve body 100 includes a body 100a and an end cap 100b, which can be installed on the body 100a. In addition, the end cap 100b is provided with an end cap hole 100c that extends through the length of the main valve core cavity 110, and the main valve core 210 can be installed in the main valve core cavity 110 through the end cap hole 100c.

[0070] In some specific embodiments, the valve body 100 includes a first sub-valve body, a second sub-valve body, a third sub-valve body, and a fourth sub-valve body. The first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body are respectively: a first valve core assembly 200a corresponds to the first sub-valve body, a second valve core assembly 200b corresponds to the second sub-valve body, a third valve core assembly 200c corresponds to the third sub-valve body, and a fourth valve core assembly 200d corresponds to the fourth sub-valve body.

[0071] Optionally, the first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body are integrated into one unit.

[0072] Optionally, at least one of the first, second, third, and fourth sub-valve bodies may be an independent sub-valve body. That is, one of the first, second, third, and fourth sub-valve bodies is independent of the other sub-valve bodies. Alternatively, the first, second, third, and fourth sub-valve bodies may be independent of each other. There are various ways to combine the first, second, third, and fourth sub-valve bodies, which will not be elaborated here.

[0073] In some specific embodiments, such as Figures 1 to 6 As shown, at least four main valve core cavities 110 include a first main valve core cavity 110a corresponding to the first valve core assembly 200a, a second main valve core cavity 110b corresponding to the second valve core assembly 200b, a third main valve core cavity 110c corresponding to the third valve core assembly 200c, and a fourth main valve core cavity 110d corresponding to the fourth valve core assembly 110d.

[0074] Optionally, at least two of the first main valve core cavity 110a, the second main valve core cavity 110b, the third main valve core cavity 110c, and the fourth main valve core cavity 110d are parallel to each other in their length directions. For example, as Figure 1 As shown, the length directions of the first main valve core cavity 110a, the second main valve core cavity 110b, the third main valve core cavity 110c, and the fourth main valve core cavity 110d are parallel to each other.

[0075] Optionally, the first main valve core cavity 110a and the second main valve core cavity 110b are interconnected.

[0076] Optionally, the third main valve core cavity 110c and the fourth main valve core cavity 110d are interconnected.

[0077] Optionally, the axis of the first main valve core cavity 110a and the axis of the second main valve core cavity 110b are collinear with each other.

[0078] Optionally, the axes of the third main valve core cavity 110c and the fourth main valve core cavity 110d are collinear with each other.

[0079] In some specific embodiments, such as Figures 1-4 As shown, each valve core assembly 200 corresponds one-to-one with a main valve core cavity 110, and one valve core assembly 200 can be installed in one main valve core cavity 110. The valve core assembly 200 includes a main valve core 210 and a pilot valve core 220. The main valve core 210 extends movably into the main valve core cavity 110 in the longitudinal direction (left-right direction), and the pilot valve core 220 is movably mounted on the main valve core 210 in the longitudinal direction (left-right direction) of the main valve core cavity 110.

[0080] Optionally, the valve core assembly 200 in this embodiment of the invention has at least four components. The at least four valve core assemblies 200 include a first valve core assembly 200a that adjusts the opening between port A and port P, a second valve core assembly 200b that adjusts the opening between port B and port P, a third valve core assembly 200c that adjusts the opening between port A and port T, and a fourth valve core assembly 200d that adjusts the opening between port B and port T.

[0081] In some specific embodiments, such as Figures 1 to 6As shown, the pilot valve cores 220 of the first valve core assembly 200a and the fourth valve core assembly 200d move simultaneously, as do the pilot valve cores 220 of the second valve core assembly 200b and the third valve core assembly 200c. Specifically, simultaneously controlling the first valve core assembly 200a and the fourth valve core assembly 200d can simultaneously adjust the opening between port A and port P and the opening between port B and port T. Furthermore, simultaneously controlling the pilot valve cores 220 of the second valve core assembly 200b and the third valve core assembly 200c can simultaneously adjust the opening between port B and port P and the opening between port A and port T.

[0082] In some specific embodiments, such as Figures 1 to 6 As shown, the main valve core 210 cooperates with the main valve core cavity 110 to define a first control cavity 111 communicating with port P, a second control cavity 112 communicating with port P, and a return cavity 113 communicating with port T. Within the first control cavity 111, the hydraulic pressure can be changed to drive the main valve core 210 to move. Within the second control cavity 112, the hydraulic pressure can be changed to drive the main valve core 210 to move. The return cavity 113 allows the liquid from the first control cavity 111 and the second control cavity 112 to be drained into the return cavity 113, thereby reducing the hydraulic pressure within the first control cavity 111 and the second control cavity 112.

[0083] Specifically, the first control chamber 111 is connected to port P, allowing liquid to enter the first control chamber 111 through port P, thus creating a certain pressure within the first control chamber 112. Similarly, the liquid can create a certain pressure within the second control chamber 112.

[0084] The first control chamber 111 and the second control chamber 112 are arranged opposite each other in a first direction, that is, the first control chamber 111 and the second control chamber 112 are arranged opposite each other in a left-right direction. When the pressure in the first control chamber 111 and the pressure in the second control chamber 112 act on the main valve core 210 at the same time, if the pressures are the same, it can be ensured that the main valve core 210 will not move relative to the valve body 100. If the pressures are different, the different pressures can push the main valve core 210 to move relative to the valve body 100.

[0085] The return chamber 113 between the main valve core 210 and the valve body 100 can receive liquid discharged from the first control chamber 111 and the second control chamber 112. In addition, the return chamber 113 is connected to the T port, and the liquid in the return chamber 113 can flow back to the T port.

[0086] In some specific embodiments, such as Figures 1 to 6As shown, a first damper 111a is provided on the communication channel between the first control chamber 111 and port P. The first damper 111a can play a certain role in reducing pressure shock. Specifically, the first damper 111a can limit the flow and reduce the pressure of the liquid in the first control chamber 111 (the function of a damper), preventing the pressure between the first control chamber 111 and port P from affecting each other. That is, when the hydraulic pressure in the first control chamber 111 changes, it will not affect the pressure at port P. Alternatively, when the hydraulic pressure at port P changes, it will not affect the pressure in the first control chamber 111.

[0087] In some specific embodiments, such as Figures 1 to 6 As shown, a second damper 112a is provided on the communication channel between the second control cavity 112 and the P port. The principle of the second damper 112a is the same as that of the first damper 111a, and will not be described again here.

[0088] In some specific embodiments, such as Figures 1 to 6 As shown, the main valve core 210 has a pilot valve core cavity 212 extending along the length (left-right direction) of the main valve core cavity 110. The pilot valve core cavity 212 can be used to install the pilot valve core 220. The main valve core 210 is provided with a first pressure relief channel 213 communicating with the first control cavity 111, a second pressure relief channel 214 communicating with the second control cavity 112, and a return channel 215 communicating with the return liquid cavity 113. The first pressure relief channel 213, the second pressure relief channel 214, and the return liquid channel 215 are respectively connected to the pilot valve core cavity 212. Specifically, the liquid in the first control cavity 111 can be discharged through the first pressure relief channel 213, thereby changing the pressure in the first control cavity 111. In addition, the principle of the second pressure relief channel 214 is the same as that of the first pressure relief channel 213, and will not be described again here.

[0089] In addition, the liquid discharged from the first pressure relief channel 213 and the liquid discharged from the second pressure relief channel 214 can flow back into the return liquid chamber 113, and then the liquid in the return liquid chamber 113 can flow back to the T port.

[0090] In some specific embodiments, such as Figures 1 to 6 As shown, multiple first pressure relief channels 213 can be provided on the main valve core 210, which can more stably discharge the liquid in the first control chamber 111. Preferably, the multiple first pressure relief channels 213 are arranged circumferentially around the valve body 100 to reduce the radial unbalanced force of the pilot valve core 220. Specifically, the liquid in the first pressure relief channels 213 will impact the pilot main valve core 220. To ensure that the pilot main valve core 220 is subjected to balanced liquid impact force, multiple first pressure relief channels 213 are arranged circumferentially symmetrically. When the radial force of the pilot main valve core 220 is balanced, the frictional force it experiences during movement is smaller, that is, the frictional force of the pilot main valve core 220 can be reduced.

[0091] Similarly, multiple second pressure relief channels 214 and multiple return channels 215 can be provided on the main valve core 210. The principle of the second pressure relief channel 214 is the same as that of the first pressure relief channel 213, and the principle of the second return channel 215 is the same as that of the first pressure relief channel 213. These will not be elaborated here.

[0092] It should be noted that the multiple first pressure relief channels 213 and multiple second pressure relief channels 214 are discretely distributed, which can avoid excessive flow and pressure gain, thereby enabling better control of the pilot main valve core 220 and improving the accuracy of the main valve core 210.

[0093] In some specific embodiments, such as Figures 1 to 6 As shown, the main valve core 210 has an adjusting shoulder 211 for adjusting the opening degree between port A and port P, between port B and port P, between port A and port T, or between port B and port T. The adjusting shoulder 211 can adjust the liquid flow rate. Specifically, when the main valve core 210 moves relative to the valve body 100, the adjusting shoulder 211 can adjust the opening degree between the first port 114 and the second port 115, thereby changing the flow rate between the first port 114 and the second port 115. In other words, by precisely controlling the movement of the main valve core 210, the flow rate of the three-position four-way proportional valve 1000 can be precisely controlled.

[0094] like Figures 1 to 6 As shown, the first port 114 of the first valve core assembly 200a is connected to port P, and the second port 115 of the first valve core assembly 200a is connected to port A. The first port 114 of the second valve core assembly 200b is connected to port P, and the second port 115 of the second valve core assembly 200b is connected to port B. The first port 114 of the third valve core assembly 200c is connected to port T, and the second port 115 of the third valve core assembly 200c is connected to port A. The first port 114 of the fourth valve core assembly 200d is connected to port T, and the second port 115 of the fourth valve core assembly 200d is connected to port B.

[0095] In some specific embodiments, such as Figures 1 to 6 As shown, the pilot valve core 220 extends movably into the pilot valve core cavity 212 along the length of the main valve core cavity 110. The pilot valve core 220 has a first shoulder 221 for adjusting the opening of the first pressure relief channel 213 and a second shoulder 222 for adjusting the opening of the second pressure relief channel 214, respectively, along the length of the main valve core cavity 110. The pilot valve core 220 can move relative to the main valve core 210, thereby allowing the first shoulder 221 to open or close the first pressure relief channel 213, thus changing the pressure within the first control cavity 111. The principle of the second shoulder 222 is the same as that of the first shoulder 221, and will not be described further here.

[0096] When the first shoulder 221 opens the first pressure relief channel 213 and the second shoulder 222 closes the second pressure relief channel 214, the pressure in the first control chamber 111 is less than the pressure in the second control chamber 112. The pressure in the second control chamber 112 can push the main valve core 220 to move. That is, the main valve core 220 moves relative to the pilot valve core 220 in the length direction of the main valve core cavity 110 in the direction from the second control chamber 112 to the first control chamber 111, until the first shoulder 221 closes the first pressure relief channel 213 and the second shoulder 222 closes the second pressure relief channel 214. Optionally, the first shoulder 221 closes the first pressure relief channel 213 and the second shoulder 222 opens the second pressure relief channel 214. The principle of this is similar to the description above and will not be repeated here.

[0097] When the pilot valve core 220 moves from the first control chamber 111 to the second control chamber 112 or from the second control chamber 112 to the first control chamber 111, the first shoulder 221 can open or close the first pressure relief passage 213, thereby changing the pressure in the first control chamber 111. Similarly, the second shoulder 222 changes the pressure in the second control chamber 112 by opening or closing the second pressure relief passage 214.

[0098] Specifically, when the pressure in the first control chamber 111 and the pressure in the second control chamber 112 change, that is, when the balance between the pressure in the first control chamber 111 and the pressure in the second control chamber 112 is disrupted, the main valve core 210 can move relative to the valve body 100 and the pilot valve core 220 under the simultaneous action of the pressure in the first control chamber 111 and the pressure in the second control chamber 112.

[0099] In addition, the first shoulder 221 closes the first pressure relief channel 213 and the second shoulder 222 closes the second pressure relief channel 214, the pressure in the first control chamber 111 and the pressure in the second control chamber 112 remain in balance, and the relative position between the main valve core 210 and the valve body 100 and the pilot valve core 220 remains unchanged.

[0100] In summary, by controlling the main valve core 210 through the pilot valve core 220, the displacement of the main valve core 210 can be precisely controlled. That is to say, the main valve core 210 and the pilot valve core 220 are linked, that is, achieved through the feedback function of the main valve core 210: when the pilot valve core 220 moves a certain distance, the main valve core 210 moves the same distance.

[0101] In some specific embodiments, such as Figures 1 to 6As shown, a Gladley ring 224 is provided on the first shoulder 221 and / or the second shoulder 222. Under elastic support, the Gladley ring 224 can block the first pressure relief channel 213 and / or the second pressure relief channel 214, thus sealing the first pressure relief channel 213 and / or the second pressure relief channel 214. Furthermore, when the diameter of the first pressure relief channel 213 and / or the second pressure relief channel 214 is smaller than the width of the Gladley ring 224, the sealing reliability of the Gladley ring 224 can be further guaranteed.

[0102] In some specific embodiments, such as Figures 1 to 6 As shown, the three-position four-way proportional valve 1000 also includes at least two drive components 300, which are disposed on the valve body 100. Each drive component 300 is connected to at least two valve core assemblies 200 to simultaneously drive at least two valve core assemblies 200. For example, one drive component 300 can simultaneously control two valve core assemblies 200, thereby controlling the three-position four-way proportional valve 1000. The at least two drive components 300 include a first drive component 300a that simultaneously drives the pilot valve core 220 of the first valve core assembly 110a and the pilot valve core 220 of the fourth valve core assembly 110d, and a second drive component 300b that simultaneously drives the pilot valve core 220 of the second valve core assembly 110b and the pilot valve core 220 of the third valve core assembly 110c.

[0103] In some specific embodiments, such as Figures 1 to 6 As shown, the drive assembly 300 includes a motor 310, a main drive component 320, a first drive component 330, and a second drive component 340. The motor 310 is mounted on the valve body 100 and has an output shaft 311. Optionally, the motor 310 can be a stepper motor.

[0104] The main drive component 320 is rotatably mounted on the valve body 100 and is connected to the output shaft 311. Optionally, the main drive component 320 can be a transmission gear.

[0105] The first transmission member 330 is rotatably mounted on the valve body 100. The first transmission member 330 is connected to the main transmission member 320, and is also connected to the pilot valve core 220 of the first valve core assembly 200a or the pilot valve core 220 of the second valve core assembly 200b. Optionally, the first transmission member 330 can be a transmission gear.

[0106] The second transmission member 340 is rotatably mounted on the valve body 100. The second transmission member 340 is connected to the main transmission member 320, and is also connected to the pilot valve core 220 of the fourth valve core assembly 200d or the pilot valve core 200 of the third valve core assembly 200c. The second transmission member 340 can be a transmission gear. Specifically, taking the first drive assembly 300a as an example, the motor 310 can simultaneously drive the pilot valve core 220 of the first valve core assembly 200a and the pilot valve core 220 of the fourth valve core assembly 200d through the first transmission member 330 and the second transmission member 340. When the pilot valve core 220 of the first valve core assembly 200a and the pilot valve core 220 of the fourth valve core assembly 200d move to the right at the same time, the main valve core 210 of the first valve core assembly 200a and the main valve core 210 of the fourth valve core assembly 200d will move to the right together, so that the P port can be connected to the A port and the B port can be connected to the T port.

[0107] Optionally, the transmission ratio between the main transmission member 320 and the first transmission member 330 may be the same as or different from the transmission ratio between the main transmission member 320 and the second transmission member 330.

[0108] Under the same conditions, it can be ensured that the displacements of the two pilot valve cores 220 are the same, thereby ensuring that the displacements of the two main valve cores are the same, and further ensuring that the corresponding openings between the first port 114 and the second port 115 are the same.

[0109] Under the same conditions, the displacements of the two pilot valve cores 220 can be different, which in turn makes the displacements of the two main valve cores different, and consequently the opening degrees between the first port 114 and the second port 115 are different.

[0110] In some specific embodiments, such as Figures 1 to 6 As shown, the pilot valve core 220 has an external thread 223 on its outer circumferential surface. The three-position four-way proportional valve 1000 also includes a threaded sleeve 400 on the valve body 100. The threaded sleeve 400 has a threaded hole 410 that matches the external thread 223. The external thread 223 of the pilot valve core 220 and the threaded hole 410 of the threaded sleeve 400 cooperate with each other, which can accurately control the start and stop of the pilot valve core 300, ensuring that the start and stop of the pilot valve core 300 is smooth, thereby accurately controlling the start and stop of the main valve core 200, ensuring that the start and stop of the main valve core 200 is smooth, and reducing the impact of the flow and pressure of the working fluid. At the same time, the cooperation between the external thread 223 of the pilot valve core 220 and the threaded hole 410 of the threaded sleeve 400 can improve the control of the displacement of the pilot valve core 220, thereby improving the displacement accuracy of the pilot valve core 220, that is, improving the displacement accuracy of the main valve core 210, and finally accurately controlling the opening between the first port 114 and the second port 115.

[0111] In some specific embodiments, such as Figures 1 to 6 As shown, the three-position four-way proportional valve 1000 also includes a reset assembly 500, which includes a reset seat 510 and an elastic part 520. The reset seat 510 is disposed on the valve body 100. For example, the reset seat 510 is located on one side of the valve body 100. The elastic part 520 is disposed on the reset seat 510 and is connected to the main valve core 210. The elastic part 520 always acts on the main valve core 210 to ensure the reset position of the main valve core 210.

[0112] In some specific embodiments, such as Figures 1 to 6 As shown, the elastic part 520 is a spring in a compressed state, which can ensure that the main valve core 210 is always subjected to force.

[0113] Working principle of the first valve core assembly 200a:

[0114] like Figure 3 As shown, the first shoulder 221 of the pilot valve core 210 closes the first pressure relief channel 213, and at the same time, the second shoulder 222 of the pilot valve core 210 closes the second pressure relief channel 214. The pressure in the first control chamber 111 is in a certain proportion to the pressure in the second control chamber 112, which can ensure that the position of the main valve core 210 will not change, that is, the opening between the first port 114 and the second port 115 remains unchanged.

[0115] like Figure 4 As shown, when the motor 310 drives the pilot valve core 220 to move to the left relative to the main valve core 210, the first shoulder 221 of the pilot valve core 220 gradually opens the first pressure relief channel 213, the pressure in the first control chamber 111 continuously decreases, and the pressure in the second control chamber 112 remains unchanged. Therefore, the pressure balance between the first control chamber 111 and the second control chamber 112 changes. Under the action of the pressure difference, the pressure in the second control chamber 112 can push the main valve core 210, causing the main valve core 210 to move to the left relative to the valve body 100 until the first shoulder 221 closes the first pressure relief channel 213 again. The pressure in the first control chamber 111 and the pressure in the second control chamber 112 are balanced again, and the main valve core 210 stops moving, thereby adjusting the position of the shoulder 211 and changing the opening between the first port 114 and the second port 115.

[0116] The hydraulic support group control system of this invention includes multiple three-position four-way proportional valves 1000, multiple hydraulic cylinders 2000, and a controller 3000. The three-position four-way proportional valves 1000 are the same as those described above. Each hydraulic cylinder 2000 corresponds one-to-one with a three-position four-way proportional valve 1000. The plug chamber 2001 of each hydraulic cylinder 2000 is connected to port A, and the rod chamber 2002 of each hydraulic cylinder 2000 is connected to port B. The controller 3000 is electrically connected to the multiple three-position four-way proportional valves 1000.

[0117] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0118] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0119] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0120] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0121] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0122] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A three-position four-way proportional valve, characterized in that, include: The valve body has an A port, a B port, a T port, a P port and at least four main valve core cavities, which are spaced apart from each other. At least four valve core assemblies are provided, each corresponding to a main valve core cavity. Each valve core assembly includes a main valve core movably extending into the main valve core cavity along its length and a pilot valve core movably disposed on the main valve core. The pilot valve core can drive the main valve core to move relative to the valve body. The at least four valve core assemblies include a first valve core assembly that adjusts the opening between port A and port P, a second valve core assembly that adjusts the opening between port B and port P, a third valve core assembly that adjusts the opening between port A and port T, and a fourth valve core assembly that adjusts the opening between port B and port T. The pilot valve core of the first valve core assembly and the pilot valve core of the fourth valve core assembly move simultaneously, as do the pilot valve core of the second valve core assembly and the pilot valve core of the third valve core assembly.

2. The three-position four-way proportional valve according to claim 1, characterized in that, The three-position four-way proportional valve has a first state, a second state, and a third state; In the first state, the opening between port A and port P is zero, the opening between port B and port P is zero, the opening between port A and port T is zero, and the opening between port B and port T is zero. In the second state, the opening degree between port A and port P is zero, the opening degree between port B and port P is greater than zero, the opening degree between port A and port T is greater than zero, and the opening degree between port B and port T is zero. In the third state, the opening degree between port A and port P is greater than zero, the opening degree between port B and port P is equal to zero, the opening degree between port A and port T is equal to zero, and the opening degree between port B and port T is greater than zero.

3. The three-position four-way proportional valve according to claim 2, characterized in that, The main valve core and the main valve core cavity cooperate to define a first control cavity that communicates with the P port, a second control cavity that communicates with the P port, and a return fluid cavity that communicates with the T port, which are arranged at intervals. The first control cavity and the second control cavity are arranged opposite to each other in the length direction of the main valve core cavity. and / or The main valve core has an adjusting shoulder for adjusting the opening between port A and port P, the opening between port B and port P, the opening between port A and port T, or the opening between port B and port T. The valve body has a first port and a second port located on both sides of the adjusting shoulder along the length direction of the main valve core cavity. The first port and the second port are respectively connected to the main valve core cavity. Each main valve core cavity corresponds to one first port and one second port. When the main valve core moves relative to the valve body, the adjusting shoulder can adjust the opening between the first port and the second port. The first port corresponding to the first valve core assembly is connected to the P port, and the second port corresponding to the first valve core assembly is connected to the A port; The first port corresponding to the second valve core assembly is connected to the P port, and the second port corresponding to the second valve core assembly is connected to the B port; The first port corresponding to the third valve core assembly is connected to the T port, and the second port corresponding to the third valve core assembly is connected to the A port; The first port corresponding to the fourth valve core assembly is connected to the T port, and the second port corresponding to the fourth valve core assembly is connected to the B port.

4. The three-position four-way proportional valve according to claim 3, characterized in that, A first damper is provided on the communication channel between the first control cavity and the P port; and / or A second damper is provided on the communication channel between the second control cavity and the P port.

5. The three-position four-way proportional valve according to claim 3, characterized in that, The main valve core has a pilot valve core cavity extending along the length direction of the main valve core cavity. The main valve core is provided with a first pressure relief channel communicating with the first control cavity, a second pressure relief channel communicating with the second control cavity, and a return channel communicating with the return liquid cavity. The first pressure relief channel, the second pressure relief channel, and the return liquid channel are respectively connected to the pilot valve core cavity.

6. The three-position four-way proportional valve according to claim 5, characterized in that, The pilot valve core is movably extended into the main valve core cavity along its length. The pilot valve core is provided with a first shoulder that adjusts the opening of the first pressure relief channel and a second shoulder that adjusts the opening of the second pressure relief channel, respectively, along the length of the main valve core cavity.

7. The three-position four-way proportional valve according to any one of claims 1-6, characterized in that, Also includes: At least two drive components are provided on the valve body, each drive component being connected to at least two valve core assemblies to simultaneously drive at least two valve core assemblies. The at least two drive components include a first drive component that simultaneously drives the pilot valve core of the first valve core assembly and the pilot valve core of the fourth valve core assembly, and a second drive component that simultaneously drives the pilot valve core of the second valve core assembly and the pilot valve core of the third valve core assembly.

8. The three-position four-way proportional valve according to claim 7, characterized in that, The driving component includes: An electric motor is mounted on the valve body and has an output shaft; A main drive component, which is rotatably mounted on the valve body and connected to the output shaft; A first transmission member is rotatably mounted on the valve body. The first transmission member is connected to the main transmission member. The first transmission member is also connected to the pilot valve core of the first valve core assembly or to the pilot valve core of the second valve core assembly. The second transmission component is rotatably mounted on the valve body and is connected to the main transmission component. The second transmission component is also connected to the pilot valve core of the fourth valve core assembly or to the pilot valve core of the third valve core assembly.

9. The three-position four-way proportional valve according to claim 8, characterized in that, The main transmission component, the first transmission component, and the second transmission component are all transmission gears; The transmission ratio between the main transmission component and the first transmission component may be the same as or different from the transmission ratio between the main transmission component and the second transmission component.

10. The three-position four-way proportional valve according to any one of claims 1-6, characterized in that, The valve body includes a first sub-valve body corresponding to the first valve core assembly, a second sub-valve body corresponding to the second valve core assembly, a third sub-valve body corresponding to the third valve core assembly, and a fourth sub-valve body corresponding to the fourth valve core assembly. The first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body are integrated; or at least one of the first sub-valve body, the second sub-valve body, the third sub-valve body, and the fourth sub-valve body is an independent sub-valve body.

11. The three-position four-way proportional valve according to any one of claims 1-6, characterized in that, The at least four main valve core cavities include a first main valve core cavity corresponding to the first valve core assembly, a second main valve core cavity corresponding to the second valve core assembly, a third main valve core cavity corresponding to the third valve core assembly, and a fourth main valve core cavity corresponding to the fourth valve core assembly. At least two of the first main valve core cavity, the second main valve core cavity, the third main valve core cavity, and the fourth main valve core cavity are parallel to each other in their length directions; and / or The first main valve core cavity and the second main valve core cavity are connected, and / or the third main valve core cavity and the fourth main valve core cavity are connected; and / or The axis of the first main valve core cavity is collinear with the axis of the second main valve core cavity and / or the axis of the third main valve core cavity is collinear with the axis of the fourth main valve core cavity.

12. A hydraulic support group control system, characterized in that, include: A plurality of three-position four-way proportional valves, wherein the three-position four-way proportional valves are three-position four-way proportional valves according to any one of claims 1-11; Multiple hydraulic cylinders, each corresponding to a three-position four-way proportional valve, wherein the plug chamber of each hydraulic cylinder is connected to port A, and the rod chamber of each hydraulic cylinder is connected to port B; A controller, which is electrically connected to a plurality of the three-position four-way proportional valves.

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