Working valve plate and multi-way valve

Abstract

The working valve plate comprises a control valve, a main valve body, a valve element and a first shuttle valve, when the valve element moves towards the second end, an oil inlet channel, a second working channel and a second feedback channel are sequentially communicated, the second feedback channel and a second oil return channel are closed, and the first shuttle valve is opened; the first working channel, the first feedback channel and the first oil return channel are sequentially communicated, and oil in the second feedback channel drives the first shuttle valve to close the pressure channel; when the valve element moves towards the first end, the oil inlet channel, the first working channel and the first feedback channel are sequentially communicated, the first feedback channel and the first oil return channel are closed, the second working channel, the second feedback channel and the second oil return channel are sequentially communicated, and oil in the first feedback channel can drive the first shuttle valve to close the pressure channel. According to the working valve plate and the multi-way valve, the problem that the engine power of the multi-way valve is wasted is solved.

Description

Technical Field

[0001] The present application relates to the technical field of oil circuit control of reversing valves, and particularly to a working valve plate and a multi-way valve. Background Art

[0002] In recent years, the Chinese construction machinery market has maintained a relatively high growth rate for several consecutive years. Major mainframe manufacturers have started to launch construction machinery with their own unique advantages according to user needs, putting forward more requirements for the multi-way valve, which is a core component of the hydraulic system.

[0003] Taking forklifts as an example, most of the multi-way valves used in domestic 5-10 ton forklifts are open-center throttle valves, and the control method is manual. The flow rate is designed to meet the maximum lifting speed requirement. However, the flow rates required for tilting and attachments are less than 60% of the lifting flow rate. To prevent the tilting and attachment speeds from being too fast, a forced throttling method is mostly used to control the tilting and attachment speeds. As a result, engine power is wasted. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a working valve plate and a multi-way valve to solve the problem that the existing multi-way valve controls the tilting and attachment speeds by forced throttling, resulting in waste of engine power.

[0005] The working valve plate provided by the present application includes a control valve, a main valve body, a valve core, and a first shuttle valve. The main valve body is provided with a pressure passage, a valve cavity, and a first oil return passage, a first feedback passage, a first working passage, an oil inlet passage, a second working passage, a second feedback passage, and a second oil return passage that are sequentially distributed along the first end to the second end of the valve cavity. The valve core is movably arranged in the valve cavity. The pressure passage can communicate with the first feedback passage and the second feedback passage. The first shuttle valve is arranged in the pressure passage. When the control valve pushes the valve core to move a first preset distance towards the second end of the valve cavity, the oil inlet passage, the second working passage, and the second feedback passage are sequentially communicated through the valve core, the second feedback passage and the second oil return passage are shut off, the first working passage, the first feedback passage, and the first oil return passage are sequentially communicated through the valve core, and the oil in the second feedback passage can drive the first shuttle valve to close the pressure passage so that the second feedback passage feeds back the oil pressure of the working valve plate. When the control valve pushes the valve core to move a second preset distance towards the first end of the valve cavity, the oil inlet passage, the first working passage, and the first feedback passage are sequentially communicated through the valve core, the first feedback passage and the first oil return passage are shut off, the second working passage, the second feedback passage, and the second oil return passage are sequentially communicated through the valve core, and the oil in the first feedback passage can drive the first shuttle valve to close the pressure passage so that the first feedback passage feeds back the oil pressure of the working valve plate.

[0006] In one embodiment, the first shuttle valve includes a first valve body and a first piston. The first valve body is fixedly disposed in the pressure passage and seals and partitions the pressure passage into a first segment communicating with the first feedback passage and a second segment communicating with the second feedback passage. The first valve body is provided with a first connection passage capable of communicating the first segment and the second segment. One end of the first connection passage close to the first segment is provided with a first movable cavity, the inner diameter of the first movable cavity is larger than the inner diameter of the first connection passage, and the inner diameter of the first movable cavity is larger than the inner diameter of the first segment. The first piston is movably disposed in the first movable cavity. When the control valve pushes the valve core to move a first preset distance toward the second end of the valve cavity, the hydraulic oil in the second feedback passage can drive the first piston to abut against one end of the first segment close to the first movable cavity and cut off the first movable cavity and the first segment. When the control valve pushes the valve core to move a second preset distance toward the first end of the valve cavity, the hydraulic oil in the first feedback passage can drive the first piston to tightly abut against one end of the first connection passage close to the first movable cavity and cut off the first movable cavity and the first connection passage.

[0007] In one embodiment, the first piston is spherical, ellipsoidal or columnar.

[0008] In one embodiment, the first shuttle valve includes a first valve body and a first piston. The first valve body is fixedly disposed in the pressure passage and seals and partitions the pressure passage into a first segment communicating with the first feedback passage and a second segment communicating with the second feedback passage. The first valve body is provided with a first connection passage capable of communicating the first segment and the second segment. One end of the first connection passage close to the second segment is provided with a second movable cavity, the inner diameter of the second movable cavity is larger than the inner diameter of the first connection passage, and the inner diameter of the second movable cavity is larger than the inner diameter of the second segment. The first piston is movably disposed in the second movable cavity. When the control valve pushes the valve core to move a first preset distance toward the second end of the valve cavity, the hydraulic oil in the second feedback passage can drive the first piston to abut against one end of the first connection passage close to the second movable cavity and cut off the second movable cavity and the first connection passage. When the control valve pushes the valve core to move a second preset distance toward the first end of the valve cavity, the hydraulic oil in the first feedback passage can drive the first piston to tightly abut against one end of the second segment close to the second movable cavity and cut off the second movable cavity and the second segment.

[0009] In one embodiment, the control valve includes a first solenoid valve and a second solenoid valve. The first solenoid valve is connected to the first end of the main valve body. When the first solenoid valve is powered on, the first thimble in the first solenoid valve can pop out under the action of electromagnetic force and push the valve core to move a first preset distance toward the second end. The second solenoid valve is connected to the second end of the main valve body. When the second solenoid valve is powered on, the second thimble in the second solenoid valve can pop out under the action of electromagnetic force and push the valve core to move a second preset distance toward the first end.

[0010] In one embodiment, the working valve plate further includes a first compression spring. The first compression spring is movably sleeved on the outer peripheral side of the first thimble, and both ends of the first compression spring respectively abut against the first solenoid valve and the valve core.

[0011] In one embodiment, the working valve plate further includes a second compression spring. The second compression spring is movably sleeved on the outer peripheral side of the second thimble, and both ends of the second compression spring respectively abut against the second solenoid valve and the valve core.

[0012] The present application also provides a multi-way valve, which includes a plurality of working valve plates as described in the above-mentioned embodiments, and the plurality of working valve plates are arranged in parallel and connected in series.

[0013] In one embodiment, the working valve plate further includes a second shuttle valve. The second shuttle valve includes a second valve body and a second piston. The main valve body is provided with a through channel. The second valve body is fixedly arranged in the through channel and seals the through channel into a first through hole penetrating one end of the working valve plate and a second through hole penetrating the other end of the working valve plate. The first through holes and the second through holes of adjacent working valve plates are correspondingly communicated; the same second valve body is provided with a second connection channel capable of communicating the first through hole and the second through hole; one end of the second connection channel close to the second through hole is provided with a third movable cavity, and the third movable cavity is constantly communicated with the second through hole. The main valve body is further provided with a balance channel communicating the third movable cavity and the first movable cavity. The inner diameter of the third movable cavity is larger than the inner diameter of the second connection channel, and the inner diameter of the third movable cavity is larger than the inner diameter of the balance channel; the second piston is movably arranged in the third movable cavity. When the second piston seals and abuts against one end of the second connection channel close to the third movable cavity and shuts off the second connection channel and the third movable cavity, the first movable cavity can be communicated with the second through hole through the balance channel and the third movable cavity in sequence; when the second piston seals and abuts against one end of the balance channel close to the third movable cavity and shuts off the balance channel and the third movable cavity, the first through hole can be communicated with the second through hole through the second connection channel and the third movable cavity in sequence.

[0014] In one embodiment, the second piston is spherical.

[0015] Compared with the prior art, for the working valve plate and the multi-way valve provided by the present application, by closing the pressure channel through the first shuttle valve, the second feedback channel cannot be communicated with the first feedback channel through the pressure channel. Thus, the second feedback channel is neither communicated with the second oil return channel nor can it be communicated with the first oil return channel through the first feedback channel. At this time, the second feedback channel will not cause the oil to relieve pressure, that is, the oil pressure in the second feedback channel can be established, so as to facilitate the second feedback channel to feedback the actual pressure of the oil in the second working channel. The working valve plate can adjust the output power of the engine according to the actual oil pressure feedback by the second feedback channel, avoid waste of the engine output power, and achieve the effect of energy saving.

[0016] The pressure passage is closed by the first shuttle valve, so that the first feedback passage cannot communicate with the second feedback passage through the pressure passage. In this way, the first feedback passage is neither connected to the first oil return passage nor can it communicate with the second oil return passage through the second feedback passage. At this time, the first feedback passage will not relieve the pressure of the oil, that is, the oil pressure in the first feedback passage can be established, so as to facilitate the first feedback passage to feedback the actual pressure of the oil in the first working passage. The working valve plate can adjust the output power of the engine according to the actual oil pressure feedback by the first feedback passage, avoid waste of the engine output power, and achieve the effect of energy saving.

[0017] In summary, it can be seen that the working valve plate improved in this application can obtain the pressure of the oil in real time and can adjust the power of the engine in real time according to the pressure of the oil, achieving the effect of energy saving. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a cross-sectional view of the working valve plate according to an embodiment provided by the present application;

[0020] Figure 2 is Figure 1 an enlarged view of the Q shown;

[0021] Figure 3 is Figure 2 a cross-sectional view taken along the line A-A shown;

[0022] Figure 4 It is a partial cross-sectional view when two working valve plates provided by the present application are connected in series;

[0023] Figure 5 It is a schematic diagram of the system connection of the working valve plate according to an embodiment provided by the present application.

[0024] Reference numerals: 100, control valve; 110, first solenoid valve; 111, first thimble; 112, first compression spring; 120, second solenoid valve; 121, second thimble; 122, second compression spring; 200, valve core; 300, main valve body; 311, first end; 312, second end; 320, valve cavity; 331, first oil return passage; 332, second oil return passage; 341, first feedback passage; 342, second feedback passage; 351, first working passage; 352, second working passage; 360, oil inlet passage; 370, pressure passage; 371, first segment; 372, second segment; 380, through passage; 381, first perforation; 382, second perforation; 390, balance passage; 400, first shuttle valve; 410, first valve body; 411, first connection passage; 412, first movable cavity; 420, first piston; 500, second shuttle valve; 510, second valve body; 511, second connection passage; 512, third movable cavity; 520, second piston. Detailed implementation manners

[0025] In recent years, the Chinese construction machinery market has maintained a relatively high growth rate for several consecutive years. In the case of the market tending to be saturated, major mainframe manufacturers have started to launch construction machinery with their own unique advantages to seize market share, so more requirements are put forward for the core component of the hydraulic system, the multi-way valve.

[0026] Taking forklifts as an example, most of the multi-way valves used in domestic 5-10 ton forklifts are open-center throttle valves, and the control method is manual. The flow rate design is based on meeting the maximum lifting speed requirement. However, the flow rates required for tilting and attachments are less than 60% of the lifting flow rate. To prevent the tilting and attachment speeds from being too fast, a forced throttling method is mostly used to control the tilting and attachment speeds, resulting in waste of engine power.

[0027] To solve the problem that the existing multi-way valve controls the tilting and attachment speeds through a forced throttling method, resulting in waste of engine power, the present application provides a working valve plate and a multi-way valve.

[0028] Please refer to Figures 1-5 , the working valve plate includes a control valve 100, a main valve body 300, a valve core 200, and a first shuttle valve 400. The main valve body 300 is provided with a valve cavity 320. The valve core 200 is movably fitted relative to the main valve body 300 along the axial direction of the valve cavity 320. The main valve body 300 is further provided with a first oil return passage 331, a first feedback passage 341, a first working passage 351, an oil inlet passage 360, a second working passage 352, a second feedback passage 342, and a second oil return passage 332 that are sequentially distributed from the first end 311 to the second end 312 of the valve cavity 320. The first oil return passage 331 communicates with the second oil return passage 332.

[0029] The main valve body 300 is also provided with a pressure passage 370 capable of communicating the first feedback passage 341 and the second feedback passage 342, and the first shuttle valve 400 is disposed in the pressure passage 370.

[0030] The control valve 100 is disposed on one or both sides of the main valve body 300 and is connected to the spool 200.

[0031] When the control valve 100 is in the closed state, the spool 200 is in the initial position of the valve cavity 320 (approximately located at the middle position between the first end 311 and the second end 312). The first feedback passage 341 and the oil inlet passage 360 respectively shut off the first working passage 351 through the spool 200, and the second feedback passage 342 and the oil inlet passage 360 respectively shut off the second working passage 352 through the spool 200. The first feedback passage 341 communicates with the first oil return passage 331 through the spool 200, and the second feedback passage 342 communicates with the second oil return passage 332 through the spool 200.

[0032] When the control valve 100 pushes the spool 200 to move a first preset distance toward the second end 312 of the valve cavity 320, the oil inlet passage 360 communicates with the second working passage 352 through the spool 200, the second working passage 352 communicates with the second feedback passage 342 through the spool 200, and the second feedback passage 342 shuts off the second oil return passage 332 through the spool 200. The first working passage 351 communicates with the first feedback passage 341 through the spool 200, and the first feedback passage 341 communicates with the first oil return passage 331 through the spool 200. Thus, an oil circulation passage in which the oil inlet passage 360, the second working passage 352, the first working passage 351, and the oil return passage are sequentially communicated is formed. Among them, the second working passage 352 is for oil inlet, and the first working passage 351 is for oil return.

[0033] Moreover, at this time (that is, when the control valve 100 pushes the spool 200 to move a first preset distance toward the second end 312 of the valve cavity 320), the oil in the second feedback passage 342 can drive the first shuttle valve 400 to close the pressure passage 370, so that the working valve plate can feedback the internal oil pressure at this time through the second feedback passage 342.

[0034] It should be noted that a second hydraulic sensor (not shown in the figure) is provided in the second feedback passage 342. The second hydraulic sensor is electrically connected to a control system (not shown in the figure). After the control system receives the oil pressure feedback by the second hydraulic sensor, it can directly control the engine to change the output power.

[0035] The pressure passage 370 is closed by the first shuttle valve 400, so that the second feedback passage 342 cannot communicate with the first feedback passage 341 through the pressure passage 370. Thus, the second feedback passage 342 is neither connected to the second oil return passage 332 nor can it communicate with the first oil return passage 331 through the first feedback passage 341. At this time, the second feedback passage 342 will not allow the oil to relieve pressure, that is, the oil pressure in the second feedback passage 342 can be established, so as to facilitate the second feedback passage 342 to feedback the actual pressure of the oil in the second working passage 352. The working valve plate can adjust the output power of the engine according to the actual oil pressure feedback by the second feedback passage 342, avoid the waste of the engine output power, and achieve the effect of energy saving.

[0036] When the control valve 100 pushes the valve core 200 to move a second preset distance towards the first end 311 of the valve cavity 320, the oil inlet passage 360 communicates with the first working passage 351 through the valve core 200, the first working passage 351 communicates with the first feedback passage 341 through the valve core 200, and the first feedback passage 341 shuts off the first oil return passage 331 through the valve core 200. The second working passage 352 communicates with the second feedback passage 342 through the valve core 200, and the second feedback passage 342 communicates with the second oil return passage 332 through the valve core 200. Thus, an oil circulation passage in which the oil inlet passage 360, the first working passage 351, the second working passage 352 and the oil return passage are connected in sequence is formed. Among them, the first working passage 351 admits oil, and the second working passage 352 returns oil.

[0037] Moreover, at this time (that is, when the control valve 100 pushes the valve core 200 to move a second preset distance towards the first end 311 of the valve cavity 320), the oil in the first feedback passage 341 can drive the first shuttle valve 400 to close the pressure passage 370, so that the working valve plate can feedback the internal oil pressure at this time through the first feedback passage 341.

[0038] It should be noted that a first hydraulic sensor (not shown in the figure) is provided in the first feedback passage 341. The first hydraulic sensor is electrically connected to the control system. After receiving the oil pressure feedback by the first hydraulic sensor, the control system can directly control the engine to change the output power.

[0039] The pressure passage 370 is closed by the first shuttle valve 400, so that the first feedback passage 341 cannot communicate with the second feedback passage 342 through the pressure passage 370. Thus, the first feedback passage 341 is neither connected to the first oil return passage 331 nor can it communicate with the second oil return passage 332 through the second feedback passage 342. At this time, the first feedback passage 341 will not let the oil relieve pressure, that is, the oil pressure in the first feedback passage 341 can be established, so as to facilitate the first feedback passage 341 to feedback the actual pressure of the oil in the first working passage 351. The working valve plate can adjust the output power of the engine according to the actual oil pressure feedback by the first feedback passage 341, avoid waste of the engine output power, and achieve the effect of energy saving.

[0040] In summary, it can be seen that the working valve plate improved in this application can obtain the pressure of the oil in real time and can adjust the power of the engine in real time according to the pressure of the oil, achieving the effect of energy saving.

[0041] In one embodiment, as Figure 1 shown, the control valve 100 includes a first solenoid valve 110 and a second solenoid valve 120. The first solenoid valve 110 is connected to the first end 311 of the main valve body 300. When the first solenoid valve 110 is energized, the first thimble 111 in the first solenoid valve 110 pops out under the action of electromagnetic force and pushes the valve core 200 to move a first preset distance toward the second end 312.

[0042] The second solenoid valve 120 is connected to the second end 312 of the main valve body 300. When the second solenoid valve 120 is energized, the second thimble 121 in the second solenoid valve 120 pops out under the action of electromagnetic force and pushes the valve core 200 to move a second preset distance toward the first end 311.

[0043] With such a setting, the control efficiency of the control valve 100 on the valve core 200 is greatly improved.

[0044] However, it is not limited to this. In other embodiments, the control valve 100 can also be a single valve body, which can control the left and right movement of the control valve 100 core respectively. With such a setting, the volume of the entire working valve plate can be effectively reduced, which is beneficial to the miniaturization of the working valve plate.

[0045] Further, in one embodiment, as Figure 1 shown, the working valve plate further includes a first compression spring 112. The first compression spring 112 is movably sleeved on the outer peripheral side of the first thimble 111, and both ends of the first compression spring 112 respectively abut against the first solenoid valve 110 and the valve core 200.

[0046] With such a setting, it can play a certain buffering role in the movement of the valve core 200, preventing the valve core 200 from moving excessively and impacting the first solenoid valve 110.

[0047] Similarly, in one embodiment, as Figure 1 shown, the working valve plate further includes a second compression spring 122. The second compression spring 122 is movably sleeved on the outer peripheral side of the second thimble 121, and both ends of the second compression spring 122 respectively abut against the second solenoid valve 120 and the valve core 200.

[0048] With such a setting, it can play a certain buffering role in the movement of the valve core 200, preventing the valve core 200 from moving excessively and impacting the second solenoid valve 120.

[0049] In one embodiment, as Figure 2 shown, the first shuttle valve 400 includes a first valve body 410 and a first piston 420. The first valve body 410 is fixedly arranged in the pressure passage 370, and seals and partitions the pressure passage 370 into a first segment 371 communicating with the first feedback passage 341 and a second segment 372 communicating with the second feedback passage 342. And, the first valve body 410 is provided with a first connection passage 411 capable of communicating the first segment 371 and the second segment 372.

[0050] One end of the first connection passage 411 close to the first segment 371 is provided with a first movable cavity 412. It should be noted that the first movable cavity 412 is arranged in the first valve body 410, the inner diameter of the first movable cavity 412 is larger than the inner diameter of the first connection passage 411, and the inner diameter of the first movable cavity 412 is larger than the inner diameter of the first segment 371. The first piston 420 is movably arranged in the first movable cavity 412. When the control valve 100 pushes the valve core 200 to move a first preset distance towards the second end 312 of the valve cavity 320, the hydraulic oil in the second feedback passage 342 can drive the first piston 420 to abut against one end of the first segment 371 close to the first movable cavity 412 and cut off the first movable cavity 412 and the first segment 371. When the control valve 100 pushes the valve core 200 to move a second preset distance towards the first end 311 of the valve cavity 320, the hydraulic oil in the first feedback passage 341 can drive the first piston 420 to seal and abut against one end of the first connection passage 411 close to the first movable cavity 412 and cut off the first movable cavity 412 and the first connection passage 411.

[0051] It should be noted that since the inner diameter of the first movable cavity 412 is larger than the inner diameter of the first connection passage 411 and larger than the inner diameter of the first segment 371. Therefore, first step structures are respectively formed at both ends of the first movable cavity 412 close to the first connection passage 411 and the first segment 371, and the first piston 420 realizes the cut-off of the first connection passage 411 by respectively abutting against the first step structure and the second step structure.

[0052] Alternatively, a second movable cavity (not shown in the figure) is provided at one end of the first connection channel 411 close to the second segment 372. It should be noted that the second movable cavity is provided in the first valve body 410, the inner diameter of the second movable cavity is larger than that of the first connection channel 411, and the inner diameter of the second movable cavity is larger than that of the second segment 372. The first piston 420 is movably disposed in the second movable cavity. When the control valve 100 pushes the valve core 200 to move a first preset distance toward the second end 312 of the valve cavity 320, the hydraulic fluid in the second feedback channel 342 can drive the first piston 420 to abut against one end of the first connection channel 411 close to the second movable cavity, and shut off the second movable cavity and the first connection channel 411. When the control valve 100 pushes the valve core 200 to move a second preset distance toward the first end 311 of the valve cavity 320, the hydraulic fluid in the first feedback channel 341 can drive the first piston 420 to tightly abut against one end of the second segment 372 close to the second movable cavity, and shut off the second movable cavity and the second segment 372.

[0053] It should be noted that, since the inner diameter of the second movable cavity is larger than that of the first connection channel 411 and larger than that of the second segment 372. Therefore, third step structures and fourth step structures are respectively formed at both ends of the second movable cavity close to the first connection channel 411 and the second segment 372. The first piston 420 shuts off the first connection channel 411 by abutting against the third step structure and the fourth step structure respectively.

[0054] With such a setting, the dynamic response rate of the first shuttle valve 400 is greatly improved, and the processing difficulty of the first shuttle valve 400 and the working valve plate is reduced.

[0055] Further, in an embodiment, the first piston 420 is spherical.

[0056] In this way, the sealing stability of the first piston 420 is greatly improved.

[0057] However, it is not limited thereto. In other embodiments, the first piston 420 may also be ellipsoidal or columnar.

[0058] The present application also provides a multi-way valve, which includes a plurality of working valve plates as described in the above-mentioned embodiments, and the plurality of working valve plates are arranged in parallel and connected in series.

[0059] In an embodiment, as Figures 2-4As shown, the working valve plate further includes a second shuttle valve 500. The second shuttle valve 500 includes a second valve body 510 and a second piston 520. The main valve body 300 is provided with a through-channel 380. The second valve body 510 is fixedly arranged in the through-channel 380 and seals and partitions the through-channel 380 into a first through-hole 381 penetrating one end of the working valve plate and a second through-hole 382 penetrating the other end of the working valve plate. The first through-hole 381 and the second through-hole 382 of adjacent working valve plates are correspondingly communicated. And, the second valve body 510 is provided with a second connection channel 511 capable of communicating the first through-hole 381 and the second through-hole 382.

[0060] One end of the second connection channel 511 close to the second through-hole 382 is provided with a third movable cavity 512. It should be noted that the third movable cavity 512 is arranged in the second valve body 510. The third movable cavity 512 is constantly communicated with the second through-hole 382. The main valve body 300 is further provided with a balance channel 390 communicating the third movable cavity 512 and the first movable cavity 412. The inner diameter of the third movable cavity 512 is larger than the inner diameter of the second connection channel 511, and the inner diameter of the third movable cavity 512 is larger than the inner diameter of the balance channel 390.

[0061] The second piston 520 is movably arranged in the third movable cavity 512. When the second piston 520 seals and abuts against one end of the second connection channel 511 close to the third movable cavity 512 and shuts off the second connection channel 511 and the third movable cavity 512, the first movable cavity 412 can be communicated with the second through-hole 382 through the balance channel 390 and the third movable cavity 512 in sequence.

[0062] When the second piston 520 seals and abuts against one end of the balance channel 390 close to the third movable cavity 512 and shuts off the balance channel 390 and the third movable cavity 512, the first through-hole 381 can be communicated with the second through-hole 382 through the second connection channel 511 and the third movable cavity 512 in sequence.

[0063] That is to say, the second piston 520 can selectively make the second through-hole 382 communicate with the first through-hole 381 or communicate with the first movable cavity 412.

[0064] With such a setting, taking two adjacent working valve plates in a sectional view in an up-and-down positional relationship as an example, defining the direction from top to bottom in sequence as the first working valve plate and the second working valve plate, the hydraulic oil in the first working valve plate enters the first through-hole 381 of the second working valve plate through its second through-hole 382, and further enters the corresponding third movable cavity 512 through the second connection channel 511 of the second working valve plate. And, at this time, the hydraulic oil exerts a pressure on the left side of the second piston 520 in the second working valve plate.

[0065] Correspondingly, the hydraulic fluid in the first active chamber 412 of the second working valve plate itself enters the corresponding third active chamber 512 through the balance passage 390, and at this time, the hydraulic fluid exerts a pressure on the right side of the second piston 520 in the second working valve plate.

[0066] When the pressure exerted by the hydraulic fluid on the left side is greater than the pressure exerted by the hydraulic fluid on the right side, that is, when the hydraulic fluid pressure of the first working valve plate is greater than the hydraulic fluid pressure of the second working valve plate, the second piston 520 in the second working valve plate will shut off its own balance passage 390. At this time, the hydraulic fluid pressure in the first active chamber 412 of the second working valve plate will increase to be the same as the hydraulic fluid pressure of the first working valve plate.

[0067] When there is a third working valve plate below the second working valve plate, the hydraulic fluid in the first working valve plate will continue to enter the third working valve plate through the second perforation 382 of the second working valve plate. If the hydraulic fluid pressure of the first working valve plate is still greater than the hydraulic fluid pressure of the third working valve plate, then all the working valve plates of the entire multi-way valve will feedback the hydraulic fluid pressure of the first working valve plate, that is, the entire multi-way valve will feedback the hydraulic fluid pressure of the largest working valve plate.

[0068] With such a setting, it is ensured that each working valve plate of the entire multi-way valve can work stably.

[0069] Furthermore, in one embodiment, the second piston 520 is spherical.

[0070] In this way, the sealing stability of the second piston 520 is greatly improved.

[0071] However, it is not limited to this. In other embodiments, the second piston 520 can also be ellipsoidal or columnar.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0073] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

[0074] In the description of the present application, it should be understood that the orientation or positional relationships indicated by 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. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0075] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0076] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0077] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0078] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A working valve plate, characterized in that: The invention comprises a control valve (100), a main valve body (300), a valve core (200) and a first shuttle valve (400); the main valve body (300) is provided with a pressure channel (370), a valve cavity (320), and a first oil return channel (331), a first feedback channel (341), a first working channel (351), an oil inlet channel (360), a second working channel (352), a second feedback channel (342) and a second oil return channel (332) which are sequentially distributed from a first end (311) to a second end (312) of the valve cavity (320); the valve core (200) is movably arranged in the valve cavity (320); the pressure channel (370) can communicate with the first feedback channel (341) and the second feedback channel (342); and the first shuttle valve (400) is arranged in the pressure channel (370); When the control valve (100) pushes the valve core (200) to move a first preset distance toward the second end (312) of the valve cavity (320), the oil inlet channel (360), the second working channel (352) and the second feedback channel (342) are connected in sequence through the valve core (200), the second feedback channel (342) and the second oil return channel (332) are closed, the first working channel (351), the first feedback channel (341) and the first oil return channel (331) are connected in sequence through the valve core (200), and the oil in the second feedback channel (342) can drive the first shuttle valve (400) to close the pressure channel (370), so that the second feedback channel (342) feeds back the oil pressure of the working valve plate; When the control valve (100) pushes the valve core (200) to move a second preset distance toward the first end (311) of the valve cavity (320), the oil inlet channel (360), the first working channel (351) and the first feedback channel (341) are connected in sequence through the valve core (200), the first feedback channel (341) and the first oil return channel (331) are closed, and the second working channel (352), the second feedback channel (342) and the second oil return channel (332) are connected in sequence through the valve core (200), and the oil in the first feedback channel (341) can drive the first shuttle valve (400) to close the pressure channel (370), so that the first feedback channel (341) can feed back the oil pressure of the working valve plate.

2. The working valve sheet according to claim 1, characterized in that: The first shuttle valve (400) comprises a first valve body (410) and a first piston (420); the first valve body (410) is fixedly disposed on the pressure channel (370) and seals and separates the pressure channel (370) into a first segment (371) connected to the first feedback channel (341) and a second segment (372) connected to the second feedback channel (342); the first valve body (410) is provided with a first connecting channel (411) capable of connecting the first segment (371) and the second segment (372); A first active cavity (412) is provided at one end of the first connecting channel (411) close to the first segment (371), the inner diameter of the first active cavity (412) is larger than the inner diameter of the first connecting channel (411), and the inner diameter of the first active cavity (412) is larger than the inner diameter of the first segment (371); The first piston (420) is movably disposed in the first active chamber (412); when the control valve (100) pushes the valve core (200) to move a first preset distance toward the second end (312) of the valve chamber (320), the oil in the second feedback channel (342) can drive the first piston (420) to abut against one end of the first segment (371) close to the first active chamber (412), and close the first active chamber (412) and the first segment (371); When the control valve (100) pushes the valve core (200) to move a second preset distance toward the first end (311) of the valve cavity (320), the oil in the first feedback channel (341) can drive the first piston (420) to seal against one end of the first connecting channel (411) close to the first active cavity (412), and shut off the first active cavity (412) and the first connecting channel (411).

3. The working valve sheet according to claim 2, characterized in that: The first piston (420) is spherical, ellipsoidal or cylindrical.

4. The working valve sheet according to claim 1, characterized in that: The first shuttle valve (400) comprises a first valve body (410) and a first piston (420); the first valve body (410) is fixedly disposed on the pressure channel (370) and seals and separates the pressure channel (370) into a first segment (371) connected to the first feedback channel (341) and a second segment (372) connected to the second feedback channel (342); the first valve body (410) is provided with a first connecting channel (411) capable of connecting the first segment (371) and the second segment (372); A second active cavity is provided at one end of the first connecting channel (411) close to the second segment (372), the inner diameter of the second active cavity is larger than the inner diameter of the first connecting channel (411), and the inner diameter of the second active cavity is larger than the inner diameter of the second segment (372); The first piston (420) is movably disposed in the second active chamber, and when the control valve (100) pushes the valve core (200) to move a first preset distance toward the second end (312) of the valve chamber (320), the oil in the second feedback channel (342) can drive the first piston (420) to abut against one end of the first connecting channel (411) close to the second active chamber, and close the second active chamber and the first connecting channel (411); When the control valve (100) pushes the valve core (200) to move a second preset distance toward the first end (311) of the valve cavity (320), the oil in the first feedback channel (341) can drive the first piston (420) to seal against one end of the second segment (372) close to the second active cavity, and shut off the second active cavity and the second segment (372).

5. The working valve sheet according to claim 1, characterized in that: The control valve (100) comprises a first solenoid valve (110) and a second solenoid valve (120), wherein the first solenoid valve (110) is connected to a first end (311) of the main valve body (300), and when the first solenoid valve (110) is energized, a first ejector pin (111) in the first solenoid valve (110) can pop out under the action of electromagnetic force and push the valve core (200) to move a first preset distance toward the second end (312); The second solenoid valve (120) is connected to the second end (312) of the main valve body (300). When the second solenoid valve (120) is energized, the second ejector pin (121) in the second solenoid valve (120) can pop out under the action of electromagnetic force and push the valve core (200) to move a second preset distance toward the first end (311).

6. The working valve sheet according to claim 5, characterized in that: It also includes a first compression spring (112), which is movably sleeved on the outer peripheral side of the first ejector pin (111), and two ends of the first compression spring (112) are respectively in contact with the first solenoid valve (110) and the valve core (200).

7. The working valve sheet according to claim 5, characterized in that: It also includes a second compression spring (122), which is movably sleeved on the outer peripheral side of the second ejector pin (121), and the two ends of the second compression spring (122) are respectively in contact with the second solenoid valve (120) and the valve core (200).

8. A multi-way valve, characterized in that: It comprises a working valve plate as described in any one of claims 2 to 3, and a plurality of the working valve plates are arranged in parallel and connected in series.

9. The multi-way valve according to claim 8, characterized in that: The working valve plate further comprises a second shuttle valve (500), the second shuttle valve (500) comprises a second valve body (510) and a second piston (520), the main valve body (300) is provided with a through passage (380), the second valve body (510) is fixedly arranged in the through passage (380) and seals and separates the through passage (380) into a first through hole (381) penetrating one end of the working valve plate and a second through hole (382) penetrating the other end of the working valve plate, and the first through hole (381) and the second through hole (382) of adjacent working valve plates are correspondingly connected; The same second valve body (510) is provided with a second connecting channel (511) capable of connecting the first through hole (381) and the second through hole (382); A third active cavity (512) is provided at one end of the second connecting channel (511) close to the second through hole (382), and the third active cavity (512) is constantly connected to the second through hole (382). The main valve body (300) is also provided with a balancing cavity (390) connecting the third active cavity (512) and the first active cavity (412), and the inner diameter of the third active cavity (512) is greater than the inner diameter of the second connecting channel (511), and the inner diameter of the third active cavity (512) is greater than the inner diameter of the balancing cavity (390); The second piston (520) is movably disposed in the third active chamber (512); when the second piston (520) is sealed against one end of the second connecting channel (511) close to the third active chamber (512) and the second connecting channel (511) and the third active chamber (512) are closed, the first active chamber (412) can be connected to the second through hole (382) via the balance channel (390) and the third active chamber (512) in sequence; When the second piston (520) is sealed against one end of the balance channel (390) close to the third active chamber (512) and shuts off the balance channel (390) and the third active chamber (512), the first through hole (381) can be connected to the second through hole (382) through the second connecting channel (511) and the third active chamber (512) in sequence.

10. The multi-way valve according to claim 9, characterized in that: The second piston (520) is spherical.

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