Multi-way valve

Abstract

The utility model relates to the technical field of hydraulic control systems, in particular to a multi-way valve. Comprising an oil inlet and return unit, a tail unit and a plurality of first reversing units located between the tail unit and the oil inlet and return unit, each first reversing unit comprises a first valve body, a first reversing valve cavity is formed in each first valve body, and a first reversing valve element with three position states is slidably installed in each first reversing valve cavity; the first valve body is provided with a first port P communicating with the first reversing valve cavity through a first oil inlet cavity, a first port T communicating with the first reversing valve cavity through a first oil return cavity, a second port T communicating with the first reversing valve cavity through a pressure relief cavity and a second communicating cavity, and a first port A communicating with the first reversing valve cavity through a first cavity A and the first communicating cavity. And a hydraulic lock for controlling connection and disconnection between the first A cavity and the first communicating cavity is arranged between the first A cavity and the first communicating cavity. By means of the structure, the phenomenon of pressure building caused when the first valve body is connected with a single-action executing element can be avoided, and unnecessary waste caused by the fact that hydraulic oil leaks out of the first valve body can also be avoided.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control system technology, specifically to a multi-way valve. Background Technology

[0002] Multi-way valves are core control components in hydraulic systems, primarily used for the coordinated control of multiple actuators (such as hydraulic cylinders and hydraulic motors). They achieve integrated regulation of hydraulic oil flow direction, flow rate, and pressure by combining multiple directional valves and auxiliary valves (such as safety valves and relief valves).

[0003] In existing technology, multi-way valves typically include an inlet / return oil coupler, a tail coupler, and several reversing couplers. These reversing couplers are located between the inlet / return oil coupler and the tail coupler, and are fixed together by through bolts. A traditional reversing coupler typically includes an inlet port (P), a return port (T), a working port (A), and a working port (B) on the valve body. The valve body also has chambers connecting these ports and a reversing valve spool for controlling the flow between these chambers. This type of reversing coupler can generally only be connected to double-acting actuators. When used with a single-acting actuator, if port B is blocked, hydraulic oil will accumulate in the chamber near port B when the reversing valve spool is in the lowered position, causing excessive pressure and resulting in pressure buildup, affecting the normal operation of the reversing coupler. If port B is not blocked, although pressure buildup will not occur, hydraulic oil will flow out through port B, causing unnecessary waste. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a multi-way valve to solve the problem in the prior art where, when the reversing coupling is connected to a single-acting actuator, blocking port B causes hydraulic oil waste, while not blocking port B causes pressure buildup, affecting the normal operation of the reversing coupling.

[0005] This utility model is achieved using the following technical solution: a multi-way valve, including an inlet / return oil connection, a tail connection, and several first reversing connections located between the tail connection and the inlet / return oil connection. Each first reversing connection includes a first valve body, on which a first reversing valve chamber is provided. A first reversing valve core with three position states is slidably installed in the first reversing valve chamber. The first valve body is provided with a first P port communicating with the first reversing valve chamber through a first inlet oil chamber, a first T port communicating with the first reversing valve chamber through a first return oil chamber, a second T port communicating with the first reversing valve chamber through a pressure relief chamber and a second connecting chamber, and a first A port communicating with the first reversing valve chamber through a first A chamber and a first connecting chamber. A hydraulic lock for controlling the connection between the first A chamber and the first connecting chamber is also provided.

[0006] When the first directional valve core is in the neutral position, the first oil inlet chamber, the first oil return chamber, the first connecting chamber, and the second connecting chamber are not connected to each other; when the first directional valve core is in the lowered position, the first connecting chamber is connected to the first oil return chamber, and the first oil inlet chamber is connected to the second connecting chamber; when the first directional valve core is in the raised position, the first oil inlet chamber is connected to the first connecting chamber.

[0007] With the above structure, when the first reversing valve core is in the lowered position, the oil coming out of the first P port can flow back to the second T port through the second connecting chamber and the pressure relief chamber. This avoids the accumulation of hydraulic oil causing pressure buildup in the valve chamber of the first reversing valve, which would affect the normal use of the multi-way valve. It also avoids hydraulic oil leaking out of the first valve body and causing unnecessary waste.

[0008] Preferably, the hydraulic lock includes a second valve sleeve fixedly mounted on the first valve body. The side wall of the second valve sleeve has several fourth through holes communicating with the first port A. The inner side of the second valve sleeve has a fifth through hole communicating with the first communicating cavity. A one-way valve core capable of blocking the fifth through hole is slidably installed inside the second valve sleeve. By setting up the hydraulic lock, the problem of static settlement can be avoided, which would affect the accuracy of the actuator operation.

[0009] Preferably, a second valve seat is fixedly installed on the side of the second valve sleeve away from the fifth through hole. A second spring is provided between the second valve seat and the one-way valve core. A first thrust valve core, capable of pushing the one-way valve core away from the fifth through hole, is slidably installed inside the first valve body. With the second spring, when the one-way valve core is not under pressure, the first spring can always press against the one-way valve core, enabling it to block the fifth through hole, thereby achieving the locking of the hydraulic lock.

[0010] Preferably, the first valve body is provided with a first thrust valve chamber, and a first thrust valve core is slidably installed in the first thrust valve chamber. The first thrust valve core divides the first thrust valve chamber into two chambers. The chamber closer to the hydraulic lock is connected to the fifth through hole and the first connecting chamber, while the chamber farther from the hydraulic lock is connected to the second connecting chamber. The first valve body is also equipped with a pressure-holding valve for controlling the connection and disconnection between the first thrust valve chamber and the pressure relief chamber. By setting the pressure-holding valve, hydraulic oil can accumulate in the chamber on the right side of the first thrust valve chamber, thereby forming a certain pressure to push the first thrust valve core and unlock the hydraulic lock. When the pressure in the chamber on the right side of the first thrust valve chamber is too high, the hydraulic oil will flow to the second T port through the pressure-holding valve, thereby avoiding the occurrence of pressure buildup.

[0011] Preferably, the pressure-holding valve includes a first valve sleeve fixedly mounted on a first valve body. The inner side of the first valve sleeve has a third through hole communicating with the side of the first thrust valve chamber away from the hydraulic lock. The side wall of the first valve sleeve has a first through hole communicating with a pressure relief chamber. A pressure-holding valve core capable of sealing the second through hole is also installed inside the first valve sleeve. By controlling the opening and closing of the second through hole through the pressure-holding valve core, the opening and closing of the pressure-holding valve is controlled, resulting in a simpler structure and more convenient use.

[0012] Preferably, a first valve seat is fixedly installed at the end of the first valve sleeve away from the second through hole, and a first spring is provided between the first valve seat and the pressure-holding valve core. By setting the first spring, the pressure limit of the pressure-holding valve can be set. When the pressure of the hydraulic oil accumulated on the right side of the first thrust valve chamber is greater than the elastic force of the first spring, the hydraulic oil can push open the pressure-holding valve core, thereby flowing to the second T port.

[0013] Preferably, the first valve body is provided with a first port B, and the first valve sleeve is provided with a first through hole. The first port B communicates with the first through hole through a first cavity B. A sealing cap for sealing the first port B is fixedly installed on the first valve body. By setting the sealing cap, hydraulic oil can be prevented from leaking out of the first port B, thereby preventing unnecessary waste.

[0014] Preferably, it further includes a plurality of second reversing links, which are located between the inlet / return oil link and the tail link; the second reversing link includes a second valve body, on which a second reversing valve chamber is provided, and a second reversing valve core having three position states is slidably installed in the second reversing valve chamber; the second valve body is provided with a second P port communicating with the second reversing valve chamber through a second inlet oil chamber, a third T port communicating with the second reversing valve chamber through a third return oil chamber, a fourth T port communicating with the second reversing valve chamber through a fourth return oil chamber, a second A port communicating with the second reversing valve chamber through a second A chamber and a third connecting chamber, and a second B port communicating with the second reversing valve chamber through a second B chamber and a fourth connecting chamber;

[0015] When the second directional valve core is in the neutral position, the second inlet chamber, third return chamber, fourth return chamber, third connecting chamber, and fourth connecting chamber are not interconnected. When the second directional valve core is in the lowered position, the third connecting chamber is connected to the third return chamber, and the second inlet chamber is connected to the fourth connecting chamber. When the second directional valve core is in the raised position, the second inlet chamber is connected to the third connecting chamber, and the fourth connecting chamber is connected to the fourth return chamber. Through the arrangement of the second directional valve, the multi-way valve of this invention can be connected to both single-acting and double-acting actuators, thereby increasing the applicability of this device.

[0016] Preferably, a hydraulic lock is provided between the second A cavity and the third connecting cavity to control the connection between them, and a hydraulic lock is also provided between the second B cavity and the fourth connecting cavity to control the connection between them. The use of hydraulic locks can also prevent static settlement from occurring and affecting the control accuracy of this device.

[0017] Preferably, the second valve body is provided with a second thrust valve chamber, which is located between the two hydraulic locks. A second thrust valve core for unlocking the two hydraulic locks is slidably installed within the second thrust valve chamber, dividing the second thrust valve chamber into two independent left and right valve chambers. The second thrust valve core allows hydraulic oil to control the unlocking of the hydraulic locks, enabling the hydraulic oil at the working port to flow back to the T-port, thus forming a circulation and preventing pressure buildup.

[0018] In summary, the beneficial effects of this utility model are as follows:

[0019] 1. By using a pressure-holding valve and a pressure-relief chamber connected to the second T port, the multi-way valve in this invention can generate a certain pressure on the right side of the first thrust valve core when controlling the single-acting actuator to descend. This pressure is used to push the first thrust valve core to unlock the hydraulic lock. If this pressure is too high, it will flow through the pressure-holding valve and the pressure-relief chamber to the second T port and then back to the oil tank. This avoids the occurrence of pressure buildup, making the device more stable and preventing hydraulic oil from leaking out of the first B port, thus reducing unnecessary waste.

[0020] 2. By setting up a second reversing coupling similar to the first reversing coupling structure, it can be installed on the same multi-way valve. That is, the multi-way valve in this utility model can control both single-acting and double-acting actuators, making it more versatile and easier to use. Attached Figure Description

[0021] Figure 1 This is a top view of a multi-way valve according to the present invention;

[0022] Figure 2 This is a cross-sectional view of the first reversing coupling when the first reversing valve core is in the neutral position in this utility model.

[0023] Figure 3 This is a cross-sectional view of the first reversing coupling when the first reversing valve core is in the lowered position.

[0024] Figure 4 This is a cross-sectional view of the first reversing coupling when the first reversing valve core is in the rising position.

[0025] Figure 5 This is a cross-sectional view of the second reversing coupling when the second reversing valve core is in the neutral position.

[0026] Figure 6 This is a cross-sectional view of the second reversing coupling when the second reversing valve core is in the lowered position.

[0027] Figure 7 This is a cross-sectional view of the second reversing coupling when the second reversing valve core is in the rising position.

[0028] In the diagram: 1-Inlet / Return Oil Connection; 2-First Reversing Connection; 3-Second Reversing Connection; 4-Tail Connection; 5-Drive Mechanism; 6-Through Bolt; 7-Hydraulic Lock;

[0029] 200 - First valve body; 201 - First P port; 202 - First T port; 203 - Second T port; 204 - First A port; 205 - First B port; 206 - Sealing cap;

[0030] 211-First oil inlet chamber; 212-First directional valve chamber; 213-First oil return chamber; 214-Second oil return chamber; 215-First connecting chamber; 216-First B chamber; 217-First A chamber; 218-First thrust valve chamber; 219-Second connecting chamber;

[0031] 220 - First directional valve core; 221 - First groove; 222 - Second groove; 223 - Third groove;

[0032] 230 - Pressure holding valve; 231 - First valve sleeve; 232 - First valve seat; 233 - First through hole; 234 - Pressure holding valve core; 235 - First spring; 236 - Pressure holding valve cavity; 237 - Second through hole; 238 - First mounting groove; 239 - Third through hole;

[0033] 240 - First thrust valve core; 241 - First push rod; 250 - Pressure relief chamber;

[0034] 300 - Second valve body; 301 - Second P port; 302 - Third T port; 303 - Fourth T port; 304 - Second A port; 305 - Second B port;

[0035] 311-Second oil inlet chamber; 312-Second directional valve chamber; 313-Third oil return chamber; 314-Fourth oil return chamber; 315-Third connecting chamber; 316-Second B chamber; 317-Second A chamber; 318-Second thrust valve chamber; 319-Fourth connecting chamber;

[0036] 320 - Second reversing valve core; 321 - Fourth groove; 322 - Fifth groove; 323 - Sixth groove;

[0037] 340 - Second thrust valve core; 341 - Second push rod;

[0038] 701-Second valve sleeve; 702-Second valve seat; 703-One-way valve core; 704-Second spring; 705-Second mounting groove; 706-Fourth through hole; 707-Lock cavity; 708-Fifth through hole. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0040] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0041] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0042] like Figure 1 As shown, this utility model provides a multi-way valve, including an inlet / return oil coupler 1 and a tail coupler 4. Between the inlet / return oil coupler 1 and the tail coupler 4, there are several first reversing couplers 2 for controlling single-acting actuators and several second reversing couplers 3 for controlling double-acting actuators. The number of second reversing couplers 3 can be zero or multiple. When the number of second reversing couplers 3 is zero, the multi-way valve of this utility model is only connected to single-acting actuators. When the number of second reversing couplers 3 is multiple, the multi-way valve of this utility model can be connected to both single-acting and double-acting actuators. The specific number of second reversing couplers 3 and first reversing couplers 2 depends on the actual situation of the actuators.

[0043] The aforementioned inlet / return oil connection 1 and tail connection 4 are conventional prior art. Inlet / return oil connection 1 is mainly connected to the oil tank, while tail connection 4 is mainly used for installation. For example, three through bolts 6 pass through inlet / return oil connection 1 to tail connection 4 and are fixed thereon. Essentially, inlet / return oil connection 1 and tail connection 4 clamp several intermediate first reversing connections 2 and second reversing connections 3. These structures are all prior art, easily known to those skilled in the art through other patents and textbooks, and are not the main utility model point of this utility model; therefore, they will not be elaborated upon here.

[0044] like Figures 1 to 4As shown, the first reversing link 2 mentioned above includes a first valve body 200. The first valve body 200 is provided with a first reversing valve chamber 212. A first reversing valve core 220, which can be driven by the drive mechanism 5 to switch between three position states, is slidably installed in the first reversing valve chamber 212. The first valve body 200 is provided with a first P port 201 that communicates with the first reversing valve chamber 212 through a first oil inlet chamber 211, a first T port 202 that communicates with the first reversing valve chamber 212 through a first oil return chamber 213, a second T port 203 that communicates with the first reversing valve chamber 212 through a pressure relief chamber 250 and a second connecting chamber 219, and a first A port 204 that communicates with the first reversing valve chamber 212 through a first A chamber 217 and a first connecting chamber 215. To prevent static settling of the actuator when it is stationary, i.e., when it is stationary, the hydraulic oil in the actuator is forced into the first valve body 200 due to the weight of the object itself, a hydraulic lock 7 is provided between the first A cavity 217 and the first connecting cavity 215 to control the opening and closing of the connection between the first A cavity 217 and the first connecting cavity 215.

[0045] The hydraulic lock 7 can be understood as a one-way valve. When the actuator is in a stationary state, the hydraulic lock 7 is closed, and the hydraulic oil in the actuator cannot flow into the first valve body 200 through the first port A 204, thereby enabling the actuator to maintain a stationary and stable state.

[0046] The hydraulic lock 7 mentioned above can also be in the form of a solenoid valve, as long as it can perform the function of a one-way valve. In this embodiment, the hydraulic lock 7 includes a second valve sleeve 701 fixedly installed on the first valve body 200. The second valve sleeve 701 has a locking cavity 707 inside. Several fourth through holes 706 are provided on the side wall of the second valve sleeve 701. The first cavity A 217 communicates with the locking cavity 707 through the fourth through holes 706. A fifth through hole 708 is provided on the inner side of the second valve sleeve 701. The first connecting cavity 215 can communicate with the locking cavity 707 through the fifth through hole 708. A one-way valve core 703 that can block the fifth through hole 708 is slidably installed inside the second valve sleeve 701.

[0047] When the one-way valve core 703 blocks the fifth through hole 708, the first connecting cavity 215 and the first A cavity 217 are not connected. When the one-way valve core 703 moves away from the fifth through hole 708, the first connecting cavity 215 and the first A cavity 217 are connected.

[0048] A second valve seat 702 is fixedly installed on the side of the second valve sleeve 701 away from the fifth through hole 708. A second spring 704 is provided between the second valve seat 702 and the one-way valve core 703. Specifically, a second mounting groove 705 is provided at the end of the one-way valve core 703 near the second valve seat 702. One end of the second spring 704 abuts against the inner wall of the second mounting groove 705, and the other end of the second spring 704 abuts against the inner side of the second valve seat 702. A first thrust valve core 240 capable of pushing the one-way valve core 703 away from the fifth through hole 708 is slidably installed in the first valve body 200.

[0049] There are many ways to drive the first thrust valve core 240. In this embodiment, the first thrust valve core 240 is mainly driven by hydraulic power. Specifically, the first valve body 200 is provided with a first thrust valve chamber 218, and the first thrust valve core 240 is slidably installed in the first thrust valve chamber 218. The first thrust valve core 240 divides the first thrust valve chamber 218 into two independent chambers. The chamber on the left is connected to the fifth through hole 708 and the first connecting chamber 215, and the chamber on the right is connected to the second connecting chamber 219. When it is necessary to push the one-way valve core 703, hydraulic oil only needs to be supplied to the chamber on the right side of the first thrust valve chamber 218, thereby forming a certain pressure in the chamber, which pushes the first thrust valve core 240 to move to the left to push the one-way valve core 703, thus unlocking the hydraulic lock 7.

[0050] However, if the first connecting chamber 215 and the pressure relief chamber 250 are directly connected, the hydraulic oil may flow directly into the second T port 203 along the pressure relief chamber 250, so that pressure will not be formed in the chamber on the right side of the first thrust valve chamber 218 or the pressure will be formed slowly. Therefore, a pressure holding valve 230 is installed on the first valve body 200 to control the opening and closing between the first thrust valve chamber 218 and the pressure relief chamber 250.

[0051] In this embodiment, the pressure holding valve 230 includes a first valve sleeve 231 fixedly installed on the first valve body 200. The first valve sleeve 231 has a pressure holding valve chamber 236 inside. The inner side of the first valve sleeve 231 has a second through hole 237. The right side of the first thrust valve chamber 218 can communicate with the pressure holding valve chamber 236 through the second through hole 237. A third through hole 239 is provided on the side wall of the first valve sleeve 231. The pressure relief chamber 250 communicates with the pressure holding valve chamber 236 through the third through hole 239. The first valve sleeve 231 is also equipped with a pressure-holding valve core 234 that can block the second through hole 237. Specifically, a first valve seat 232 is fixedly installed at the end of the first valve sleeve 231 away from the second through hole 237. A first mounting groove 238 is provided at the end of the pressure-holding valve core 234 near the first valve seat 232. One end of a first spring 235 abuts against the inner wall of the first mounting groove 238. The other end of the first spring 235 abuts against the inner side of the first valve seat 232.

[0052] In addition, a first B port 205 is provided on the first valve body 200, and a first through hole 233 is provided on the first valve sleeve 231. The first B port 205 communicates with the first through hole 233 through the first B cavity 216, and the first B cavity 216 communicates with the pressure holding valve cavity 236 through the first through hole 233. To prevent hydraulic oil from leaking out from the first B port 205, a sealing cap 206 for sealing the first B port 205 is fixedly installed on the first valve body 200. The first B port 205 and the first B cavity 216 mentioned above are not used when connected to a single-acting actuator; that is, only the first A port 204 needs to be connected to the single-acting actuator. In the first reversing coupling 2, the second T port 203 can also be directly connected to the first reversing valve cavity 212 through the second return oil cavity 214.

[0053] As a further illustration of this example, the first P port 201 is located in the middle of the first oil inlet chamber 211, and both ends of the first oil inlet chamber 211 are connected to the first reversing valve chamber 212. The reversing valve stem is also provided with a first groove 221, a second groove 222, and a third groove 223 for connecting the various chambers.

[0054] The working principle of the first reversing coupling in this utility model is as follows: when the first reversing valve core 220 is in the neutral position, the first oil inlet chamber 211, the first oil return chamber 213, the second oil return chamber 214, the first connecting chamber 215, and the second connecting chamber 219 are not connected to each other, and the hydraulic lock 7 and the pressure holding valve 230 are in the closed state, that is, the first A chamber 217 is not connected to the first connecting chamber 215, and the second connecting chamber 219 is not connected to the pressure relief chamber 250.

[0055] When the first reversing valve core 220 is in the lowered position, the first oil inlet chamber 211 is connected to the second connecting chamber 219 through the third groove 223, and the first connecting chamber 215 is connected to the first return oil chamber 213 through the first groove 221. At this time, the first P port 201 supplies hydraulic oil to the first oil inlet chamber 211, and the hydraulic oil flows along the second connecting chamber 219 to the right side of the first thrust valve chamber 218. The oil pressure on the right side of the first thrust valve chamber 218 will push the first thrust valve core 240 to move to the left. The first thrust valve core 240 is provided with first push rods 241 at both ends. The one-way valve core 703 is pushed to the right through the fifth through hole 708, thereby connecting the first A chamber 217 and the first connecting chamber 215. The hydraulic oil in the single-acting actuator flows from the first A port 204 through the lock chamber 707 and the first connecting chamber 215 to the first T port 202. As the pressure on the right side of the first thrust valve chamber 218 increases, the hydraulic oil exceeding the maximum pressure limit of the pressure holding valve 230 will push open the pressure holding valve core 234 and flow back to the second T port 203 through the pressure relief chamber 250, thus flowing back to the oil tank to avoid waste and pressure buildup.

[0056] When the first reversing valve core 220 is in the rising position, the first oil inlet chamber 211 is connected to the first connecting chamber 215 through the first groove 221. At this time, the first P port 201 supplies hydraulic oil to the first oil inlet chamber 211. The hydraulic oil flows along the first connecting chamber 215 to the left side of the first thrust valve chamber 218 and pushes open the one-way valve core 703. It then flows along the fourth through hole 706 through the first A port 204 to the single-acting actuator, thereby controlling the actuator to perform the rising operation. During this process, the first thrust valve core 240 will also move to the right under the pressure of the hydraulic oil, but this action has no other effect, so it is not considered.

[0057] like Figure 1 , Figures 5 to 7 As shown, the second reversing coupling 3 in this utility model includes a second valve body 300. The second valve body 300 is provided with a second reversing valve chamber 312. A second reversing valve core 320, which can be driven by a driving mechanism 5 to switch between three position states, is slidably installed in the second reversing valve chamber 312. The second valve body 300 is provided with a second P port 301 that communicates with the second reversing valve chamber 312 through a second oil inlet chamber 311, a third T port 302 that communicates with the second reversing valve chamber 312 through a third oil return chamber 313, a fourth T port 303 that communicates with the second reversing valve chamber 312 through a fourth oil return chamber 314, a second A port 304 that communicates with the second reversing valve chamber 312 through a second A chamber 317 and a third connecting chamber 315, and a second B port 305 that communicates with the second reversing valve chamber 312 through a second B chamber 316 and a fourth connecting chamber 319.

[0058] The second reversing valve core 320 is provided with a fourth groove 321, a fifth groove 322 and a sixth groove 323 for communicating between the chambers in the second valve body 300.

[0059] Similarly, to prevent static settlement, a hydraulic lock 7 is provided between the second A cavity 317 and the third connecting cavity 315 to control the connection between them, and a hydraulic lock 7 is also provided between the second B cavity 316 and the fourth connecting cavity 319 to control the connection between them. The two hydraulic locks 7 in the second valve body 300 have the same structure and function as the hydraulic lock 7 in the first valve body 200, and the hydraulic lock 7 on the right side is equivalent to replacing the pressure holding valve 230 in the first reversing coupling 2.

[0060] Similarly, in order to control the opening and closing of the two hydraulic locks 7, a second thrust valve chamber 318 is provided on the second valve body 300. The second thrust valve chamber 318 is located between the two hydraulic locks 7. A second thrust valve core 340 for unlocking the two hydraulic locks 7 is slidably installed in the second thrust valve chamber 318. A second push rod 341 that can pass through the fifth through hole 708 is fixedly installed at both ends of the second thrust valve core 340. The second thrust valve core 340 divides the second thrust valve chamber 318 into two independent valve chambers, left and right.

[0061] The second reversing coupling 3 is structurally similar to the first reversing coupling 2, with the only differences being that the pressure-holding valve 230 in the first reversing coupling 2 is replaced by a hydraulic lock 7 in the second reversing coupling 3; the first reversing coupling 2 also has a pressure relief chamber 250, while the second reversing coupling 3 does not; and the first B port 205 in the first reversing coupling 2 is blocked, while the second B port 305 in the second reversing coupling 3 is used. These subtle structural changes allow the first reversing coupling 2 and the second reversing coupling 3 to be installed in the same multi-way valve. This means that the multi-way valve in this invention can select the number of first reversing couplings 2 or second reversing couplings 3 according to actual needs, enabling its application on different types of actuators and broadening its applicability.

[0062] The working principle of the second reversing coupling 3 in this utility model is as follows: when the second reversing valve core 320 is in the neutral position, the second oil inlet chamber 311, the third connecting chamber 315, the fourth connecting chamber 319, the third oil return chamber 313, and the fourth oil return chamber 314 are not connected to each other, and the actuator is stationary.

[0063] When the second directional valve core 320 is in the lowered position, the second oil inlet chamber 311 is connected to the fourth connecting chamber 319, and the third connecting chamber 315 is connected to the third return oil chamber 313. At this time, the second P port 301 supplies oil to the second oil inlet chamber 311. The hydraulic oil flows along the sixth groove 323 and the fourth connecting chamber 319 to the right side of the second thrust valve chamber 318. As the amount of hydraulic oil increases, the hydraulic oil will push the second thrust valve core 340 to open the one-way valve core 703 of the left hydraulic lock 7, while the one-way valve core 703 of the right hydraulic lock 7 will be opened by the oil pressure of the hydraulic oil and flow along the second B chamber 316 into the double-acting actuator. The hydraulic oil in the other oil chamber of the double-acting actuator will flow from the second A port 304 through the opened hydraulic lock 7 through the third connecting chamber 315 and the fourth groove 321, and finally flow into the third T port 302 back to the oil tank, thereby controlling the contraction of the actuator.

[0064] When the second reversing valve core 320 is in the rising position, the second oil inlet chamber 311 is connected to the third connecting chamber 315, and the first connecting chamber 215 is connected to the fourth T port 303 through the sixth groove 323. The flow direction of the hydraulic oil is opposite to the flow direction when the second reversing valve core 320 is in the falling position. That is, when the second reversing valve core 320 is in the rising position, the hydraulic oil supplied by the second P port 301 flows to the second A port 304, and the hydraulic oil in the actuator flows from the second B port 305 to the fourth T port 303. The intermediate process is similar to that in the falling position, so it is omitted.

[0065] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A multi-way valve, comprising an inlet / return oil connection (1), a tail connection (4), and a plurality of first reversing connections (2) located between the tail connection (4) and the inlet / return oil connection (1), characterized in that, The first reversing coupling (2) includes a first valve body (200), a first reversing valve chamber (212) is provided on the first valve body (200), a first reversing valve core (220) with three position states is slidably installed in the first reversing valve chamber (212), the first valve body (200) is provided with a first P port (201) communicating with the first reversing valve chamber (212) through a first oil inlet chamber (211), a first T port (202) communicating with the first reversing valve chamber (212) through a first oil return chamber (213), a second T port (203) communicating with the first reversing valve chamber (212) through a pressure relief chamber (250) and a second connecting chamber (219), and a first A port (204) communicating with the first reversing valve chamber (212) through a first A chamber (217) and a first connecting chamber (215). A hydraulic lock (7) for controlling the connection and disconnection between the first A chamber (217) and the first connecting chamber (215) is also provided. When the first reversing valve core (220) is in the neutral position, the first oil inlet chamber (211), the first oil return chamber (213), the first connecting chamber (215), and the second connecting chamber (219) are not connected to each other; when the first reversing valve core (220) is in the lowered position, the first connecting chamber (215) is connected to the first oil return chamber (213), and the first oil inlet chamber (211) is connected to the second connecting chamber (219); when the first reversing valve core (220) is in the raised position, the first oil inlet chamber (211) is connected to the first connecting chamber (215).

2. The multi-way valve according to claim 1, characterized in that, The hydraulic lock (7) includes a second valve sleeve (701) fixedly installed on the first valve body (200). The side wall of the second valve sleeve (701) is provided with a number of fourth through holes (706) communicating with the first A port (204). The inner side of the second valve sleeve (701) is provided with a fifth through hole (708) communicating with the first communicating cavity (215). A one-way valve core (703) capable of blocking the fifth through hole (708) is slidably installed inside the second valve sleeve (701).

3. The multi-way valve according to claim 2, characterized in that, A second valve seat (702) is fixedly installed on the side of the second valve sleeve (701) away from the fifth through hole (708). A second spring (704) is provided between the second valve seat (702) and the one-way valve core (703). A first thrust valve core (240) capable of pushing the one-way valve core (703) away from the fifth through hole (708) is slidably installed inside the first valve body (200).

4. The multi-way valve according to claim 3, characterized in that, The first valve body (200) is provided with a first thrust valve chamber (218), and a first thrust valve core (240) is slidably installed in the first thrust valve chamber (218). The first thrust valve core (240) divides the first thrust valve chamber (218) into two chambers. The chamber near the hydraulic lock (7) is connected to the fifth through hole (708) and the first connecting chamber (215), and the chamber away from the hydraulic lock (7) is connected to the second connecting chamber (219). The first valve body (200) is also provided with a pressure holding valve (230) for controlling the opening and closing between the first thrust valve chamber (218) and the pressure relief chamber (250).

5. The multi-way valve according to claim 4, characterized in that, The pressure holding valve (230) includes a first valve sleeve (231) fixedly installed on the first valve body (200). The inner side of the first valve sleeve (231) is provided with a second through hole (237) communicating with the side of the first thrust valve chamber (218) away from the hydraulic lock (7). The side wall of the first valve sleeve (231) is provided with a third through hole (239) communicating with the pressure relief chamber (250). The first valve sleeve (231) is also equipped with a pressure holding valve core (234) that can block the second through hole (237).

6. The multi-way valve according to claim 5, characterized in that, A first valve seat (232) is fixedly installed at the end of the first valve sleeve (231) away from the second through hole (237), and a first spring (235) is provided between the first valve seat (232) and the pressure holding valve core (234).

7. The multi-way valve according to claim 5, characterized in that, The first valve body (200) is provided with a first B port (205), and the first valve sleeve (231) is provided with a first through hole (233). The first B port (205) is connected to the first through hole (233) through the first B cavity (216). A sealing cap (206) for sealing the first B port (205) is fixedly installed on the first valve body (200).

8. The multi-way valve according to claim 1, characterized in that, It also includes several second reversing couplers (3), which are located between the inlet / return oil coupler (1) and the tail coupler (4); the second reversing coupler (3) includes a second valve body (300), a second reversing valve chamber (312) is provided on the second valve body (300), a second reversing valve core (320) with three position states is slidably installed in the second reversing valve chamber (312), and a second P port (30) is provided on the second valve body (300) that communicates with the second reversing valve chamber (312) through the second inlet oil chamber (311). 1) The third T port (302) is connected to the second reversing valve chamber (312) through the third return oil chamber (313); the fourth T port (303) is connected to the second reversing valve chamber (312) through the fourth return oil chamber (314); the second A port (304) is connected to the second reversing valve chamber (312) through the second A chamber (317) and the third connecting chamber (315); and the second B port (305) is connected to the second reversing valve chamber (312) through the second B chamber (316) and the fourth connecting chamber (319). When the second directional valve core (320) is in the neutral position, the second oil inlet chamber (311), the third oil return chamber (313), the fourth oil return chamber (314), the third connecting chamber (315), and the fourth connecting chamber (319) are not connected to each other; when the second directional valve core (320) is in the lowered position, the third connecting chamber (315) is connected to the third oil return chamber (313), and the second oil inlet chamber (311) is connected to the fourth connecting chamber (319); when the second directional valve core (320) is in the raised position, the second oil inlet chamber (311) is connected to the third connecting chamber (315), and the fourth connecting chamber (319) is connected to the fourth oil return chamber (314).

9. The multi-way valve according to claim 8, characterized in that, A hydraulic lock (7) is provided between the second A cavity (317) and the third connecting cavity (315) to control the connection between them, and a hydraulic lock (7) is also provided between the second B cavity (316) and the fourth connecting cavity (319) to control the connection between them.

10. The multi-way valve according to claim 9, characterized in that, The second valve body (300) is provided with a second thrust valve chamber (318), which is located between two hydraulic locks (7). A second thrust valve core (340) for unlocking the hydraulic locks (7) on both sides is slidably installed in the second thrust valve chamber (318). The second thrust valve core (340) divides the second thrust valve chamber (318) into two independent valve chambers on the left and right.

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