Manual proportional combination valve

Abstract

The invention relates to a manual proportional combination valve, and belongs to a control valve. The manual proportional combination valve comprises a manual proportional valve block, a lead screw valve element, a reset spring and an operation assembly driving the lead screw valve element to move, the manual proportional valve block is provided with a sliding cavity allowing the lead screw valve element to be arranged in a sliding mode, and a handle block and a spring block are arranged at the positions, at the two ends of the sliding cavity, of the manual proportional valve block respectively. The handle block and the spring block are each provided with an extending cavity communicated with the sliding cavity, the manual proportional valve block is provided with a first reserved channel and a second reserved channel, and the first reserved channel and the second reserved channel are communicated with the extending cavities of the handle block and the spring block respectively. The first reserved channel and the second reserved channel are used for being communicated with an external pump body so that the lead screw valve element can be remotely controlled. According to the manual proportional valve, multiple functions used for controlling the execution element are integrated in the manual proportional valve, the space proportion is reduced, and the cost is greatly reduced.

Description

Technical Field

[0001] The present application relates to a control valve, and in particular to a manual proportional compound valve. Background Art

[0002] A manually operated proportional valve is a special type of flow control valve. Its core feature is that the manual force applied by the operator (such as the force or angle of pressing or rotating the handle) is in a linear or predictable proportional relationship with the valve opening, achieving precise, smooth and continuous control of the flow rate. Existing manually operated proportional valves consist of a valve body, a valve core, an operating mechanism, a transmission mechanism, a return spring, and a seal. The transmission mechanism connects the operating mechanism and the valve core, and the return spring pushes the valve core back to its initial position after the operating force is released. The operator rotates or pushes the operating mechanism to adjust the position of the valve core within the valve body, thereby adjusting the valve opening. Manually operated proportional valves control the lifting actuators of windlasses and winches.

[0003] Regarding the above-mentioned related technologies, although the existing manually operated proportional valves are simple in function, low in cost and can achieve a basic proportional relationship between opening and operating force, their inherent functional limitations make it difficult to adapt to increasingly complex control needs. Summary of the Invention

[0004] In order to adapt to increasingly complex control requirements, the present application provides a manual proportional compound valve.

[0005] The present application provides a manual proportional compound valve adopting the following technical solution: A manual proportional compound valve comprises a manual proportional valve block, a screw valve core, a return spring and an operating assembly for driving the screw valve core to move, the manual proportional valve block having a sliding chamber for the screw valve core to slide, the manual proportional valve block being provided with a handle block and a spring block at both ends of the sliding chamber, the handle block and the spring block both having an extension chamber connected to the sliding chamber, the manual proportional valve block being provided with a first reserved channel and a second reserved channel, the first reserved channel and the second reserved channel being connected to the extension chambers of the handle block and the spring block respectively, the first reserved channel and the second reserved channel being used to connect to an external pump body to realize remote control of the screw valve core.

[0006] By adopting the above technical solution, the first reserved channel and the second reserved channel are connected to the external pump body to realize remote control of the screw valve core, so that the manual proportional compound valve can adapt to more complex control requirements in the remote control mode, breaking through the functional limitations of the existing manually operated proportional valve.

[0007] Optionally, the manual proportional valve block is provided with screw plugs for sealing the openings of the first reserved channel and the second reserved channel.

[0008] By adopting the above technical solution, the openings of the first reserved channel and the second reserved channel are blocked by screw plugs, which can prevent impurities from entering the channels and ensure the normal operation of the manual proportional compound valve when it is not connected to the external pump body.

[0009] Optionally, the first reserved channel includes an internal channel connected to the extension chamber, an external channel connected to the external pump body, and a pressure relief channel, the input port of the internal channel is connected to the side wall of the external channel, and the input port of the pressure relief channel is connected to the end of the external channel; The manual proportional valve block is slidably provided with a pressure relief structure at the connection point between the external channel and the internal channel. The pressure relief structure has two states: pressure relief and pushing. When the pressure relief structure is in the pressure relief state, the internal channel and the external channel are sealed, and the external channel and the pressure relief channel are connected. When the pressure relief structure is in the pushing state, the internal channel and the external channel are connected, and the external channel and the pressure relief channel are sealed.

[0010] By adopting the above technical solution, utilizing the connecting structure of the internal channel, external channel and pressure relief channel of the first reserved channel, in combination with the slidable pressure relief structure and its different state switching, effective pressure regulation and stable operation of the screw valve core during remote control are achieved.

[0011] Optionally, the pressure relief structure includes a pressure relief block and a pressure relief elastic member that drives the pressure relief block to reset, the side of the pressure relief block close to the input port of the internal channel is sealed against the inner wall of the internal channel, and a connecting gap is provided on the side of the pressure relief block close to the pressure relief channel, and the connection between the internal channel and the pressure relief channel is achieved through the connecting gap, and the pressure relief block is provided with a folded channel for connecting the internal channel and the external channel.

[0012] By adopting the above technical solution and utilizing the pressure relief block and the pressure relief elastic member, the connectivity switching between the internal channel, the external channel and the pressure relief channel is achieved, and the two states of pressure relief and pushing can be flexibly switched, thereby better adapting to the needs of remote control of the screw valve core under different working conditions.

[0013] Optionally, the inner wall of the internal channel is provided with an internal mounting surface, one end of the pressure relief elastic member is fixed to the internal mounting surface, and the other end is fixed to the end face of the pressure relief block away from the pressure relief channel, the inner wall of the internal channel is provided with an internal sealing ring that seals against the outer wall of the pressure relief block, and the external channel is provided with a sealing notch surface for sealing against the pressure relief block.

[0014] By adopting the above technical solution, the internal mounting surface can provide a stable installation foundation for the pressure relief elastic part, so that the pressure relief elastic part can function stably. The internal sealing ring can effectively prevent the medium in the internal channel from leaking from the outer wall of the pressure relief block, thereby ensuring the sealing of the channel. The sealing notch surface can further improve the sealing performance between the external channel and the pressure relief block.

[0015] Optionally, a pushing column for pushing the pressure relief block is provided at the end of the screw plug.

[0016] By adopting the above technical solution, when the manual proportional compound valve is not connected to the external pump body, the pressure relief block can be pushed to the pushed state through the screw plug, so that the internal channel and the pressure relief channel are in a sealed state, ensuring the stability of manual control.

[0017] Optionally, the manual proportional valve block has an oil inlet P1 and an oil outlet T1 connected to the sliding chamber. The manual proportional valve is provided with a pressure-compensating logic valve at the oil inlet P1, and the oil flows to the sliding chamber through the pressure-compensating logic valve. The external control oil port of the pressure-compensating logic valve is connected to the oil outlet T1, and the flow rate through the pressure-compensating logic valve is increased or decreased by controlling the pressure of the oil outlet T1.

[0018] By adopting the above technical solution, an oil inlet P1 and an oil outlet T1 are provided to connect to the sliding chamber, so that oil can flow in and out. A pressure-compensating logic valve is provided and its external control oil port is connected to the oil outlet T1. The pressure of the oil outlet T1 can be used to control the flow through the pressure-compensating logic valve, thereby achieving precise, smooth and continuous control of the flow, and improving the performance and adaptability of the manual proportional compound valve.

[0019] Optionally, the manual proportional valve block is provided with a high-pressure shuttle valve at the output port of the sliding chamber, and the working port of the high-pressure shuttle valve is connected to the brake component of the actuator.

[0020] By adopting the above technical solution, the high-pressure shuttle valve is set and its working port is connected to the brake part of the actuator. The high-pressure shuttle valve can be used to select higher pressure oil to provide reliable pressure support for the brake part of the actuator, thereby realizing the braking function.

[0021] Optionally, it also includes a balancing valve connected to the output end of the high-pressure shuttle valve and an overload protection valve connected to the external oil control port of the balancing valve. The overload protection valve is a pilot relief valve, and the remote control port of the overload protection valve is provided with a proportional relief valve.

[0022] By adopting the above technical solution, the system pressure stability and flow balance are ensured; the overload protection valve is connected to the external oil control port of the balancing valve, and a pilot relief valve is used as the overload protection valve, which can quickly respond and release the pressure when the system pressure is too high to protect the system safety; a proportional relief valve is set at the remote control port of the overload protection valve to achieve tension adjustment.

[0023] Optionally, it also includes a pressure reducing valve and a manual reversing valve, the oil inlet of the pressure reducing valve is connected to the T1 oil outlet of the manual proportional valve, the manual reversing valve is arranged at the oil outlet of the pressure reducing valve, and the manual reversing valve has a TB port for outputting large displacement and a TA port for outputting small displacement.

[0024] By adopting the above technical solution, the oil flowing out of the oil outlet of the manual reversing valve is decompressed, and the output of large or small displacement oil can be selected according to actual needs, meeting the control requirements of flow rate under different working conditions and realizing variable speed adjustment.

[0025] In summary, this application includes at least one of the following beneficial technical effects: This application realizes the local control function through the operating component, and the remote control function can be realized by connecting an external pump body; This application can realize the brake and release function of the actuator through the setting of the high-pressure shuttle valve, and the tension function of the actuator can be realized through the proportional relief valve; This application can realize the dual-speed control function of the actuator through the manual reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0027] Figure 2 It is a cross-sectional schematic diagram of the manual proportional valve block of Example 1.

[0028] Figure 3 It is a structural diagram of the operating components of Example 1.

[0029] Figure 4 It is the hydraulic principle diagram of Example 1.

[0030] Figure 5 It is a structural schematic diagram of the pressure relief structure of Example 2 in the pressure relief state.

[0031] Figure 6 It is a structural schematic diagram of the pressure relief structure of Example 2 in a pushing state.

[0032] Explanation of Reference Numerals: 1. Manual proportional valve block; 11. Sliding chamber; 12. Handle block; 121. Extension chamber; 13. Spring block; 131. Spring washer; 132. Spring pin; 14. First reserved passage; 141. Internal passage; 1411. Internal mounting surface; 1412. Sealing notch surface; 142. External passage; 1421. First through-tube; 1422. Second through-tube; 143. Pressure relief passage; 144. Internal sealing ring; 15. Second reserved passage; 16. Screw plug; 161. Push post; 17. Pressure reducing valve; 18. Pressure relief structure; 181. Pressure relief block; 1811. Sealing ring groove; 1812. Folding channel; 1813. Connecting gap; 182. Pressure relief elastic member; 2. Screw valve core; 21. Drive through hole; 3. Return spring; 4. Operating assembly; 41. Handle shaft; 42. Push ball; 421. Connecting part; 422. Pushing part; 43. Handle rod; 5. Pressure compensation logic valve; 6. High-pressure shuttle valve; 7. Balancing valve; 8. Overload protection valve; 9. Proportional relief valve; 10. Manual reversing valve. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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 operate in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] The following is combined with Figures 1-6 This application is described in further detail.

[0035] The embodiment of the present application discloses a manual proportional compound valve.

[0036] Example 1: Reference Figure 1 and Figure 2 A manual proportional compound valve includes a manual proportional valve block 1, a screw valve core 2, a return spring 3, and an operating component 4 for driving the screw valve core 2 to move.

[0037] The manual proportional valve block 1 contains a sliding chamber 11 for the sliding movement of the lead screw valve core 2. The two ends of the sliding chamber 11 extend through the opposite walls of the manual proportional valve block 1. A handle block 12 and a spring block 13 are mounted on the two end openings of the sliding chamber 11. Both the handle block 12 and the spring block 13 have extension chambers 121 that communicate with the sliding chamber 11. The sliding chamber 11 has two operating oil ports, A and B, as well as an oil inlet port P and an oil outlet port T.

[0038] Combine Figure 3 The operating assembly 4 includes a handle shaft 41 rotatably mounted on the handle block 12, a push ball 42 mounted on the handle shaft 41 and used to push the lead screw valve core 2, and a handle rod 43 mounted at the end of the handle shaft 41 for manual rotation. The handle shaft 41 and the extension chamber 121 are sealed together. The push ball 42 includes a connecting portion 421 fixedly plugged into the handle shaft 41 and a spherical push portion 422 positioned within the lead screw valve core 2. The lead screw valve core 2 has a drive through hole 21 for the push portion 422 to be inserted into.

[0039] The return spring 3 is a compression spring. Spring washers 131 are installed within the spring block 13, against which both ends of the return spring 3 abut. The two sets of spring washers 131 are connected by a spring pin 132. One end of the spring pin 132 is fixedly connected to the lead screw valve core 2, so that when the lead screw valve core 2 moves, the spring washers 131 and the spring pin 132 move simultaneously.

[0040] Reference Figure 4 In order to remotely control the sliding of the lead screw valve core 2, the manual proportional valve block 1 has a first reserved channel 14 and a second reserved channel 15. One end of the first reserved channel 14 is connected to the extension chamber 121 of the spring block 13, and the other end passes through the side wall of the manual proportional valve block 1 and is used to connect to the external pump body. The opening end of the first reserved channel 14 connecting to the external pump body is defined as the X port. One end of the second reserved channel 15 is connected to the extension chamber 121 of the handle block 12, and the other end passes through the side wall of the manual proportional valve block 1 and is used to connect to the external pump body. The opening end of the second reserved channel 15 connecting to the external pump body is defined as the Y port. During remote control, the external pump at port X is activated, applying a pressure of 2-3 MPa to port X, causing oil to be transported from the first reserved channel 14 to the spring block 13, increasing the pressure in the extension chamber 121 of the handle block 12 and driving the screw valve core 2 to slide. The external pump applies a pressure of 2-3 MPa to port Y, causing oil to be transported from the second reserved channel 15 to the handle block 12, increasing the pressure in the extension chamber 121 of the spring block 13 and driving the screw valve core 2 to slide. When remote control is not required, screw plugs 16 can be installed at the open ends of the first and second reserved channels 14, 15 to seal them.

[0041] The manual proportional valve block 1 has an oil inlet P1 connected to the P port of the sliding chamber 11, and an oil outlet T1 connected to the T port of the sliding chamber 11. The present application also includes a pressure-compensated logic valve 5, which is arranged on the route between the oil inlet P1 and the sliding chamber. The oil inlet of the pressure-compensated logic valve 5 faces P1, and the oil outlet faces the sliding chamber. The external control oil port of the pressure-compensated logic valve 5 is connected to T1.

[0042] In this application, oil enters through port P1, flows through pressure-compensated logic valve 5, and then flows to sliding chamber 11. Pressure feedback is provided to pressure-compensated logic valve 5 via port T1, thereby controlling the increase or decrease in flow through pressure-compensated logic valve 5. When oil reaches the inlet of screw valve core 2, the forward and reverse flow of the oil can be controlled by rotating handle rod 43. In addition, by connecting external pump body oil circuits at ports X and Y, the forward and reverse flow of screw valve core 2 can be remotely controlled.

[0043] In this application, a high-pressure shuttle valve 6 is installed at the working oil port of the sliding chamber 11. The two oil inlets of the high-pressure shuttle valve 6 are connected to the working oil port A and the working oil port B, respectively. The working port of the high-pressure shuttle valve 6 is a V-port, which is connected to the brake component of the actuator, which activates and stops the screw valve core 2. In this embodiment, the actuator is a hoisting device such as a winch or windlass.

[0044] In addition, manual proportional valve block 1 is equipped with a balancing valve 7 and an overload protection valve 8 connected to the oil output port of balancing valve 7 at the oil outlet of high-pressure shuttle valve 6. Balancing valve 7 is a pilot valve, with its valve port connected to one oil inlet of high-pressure shuttle valve 6, its load port connected to the oil inlet of overload protection valve 8, and its pilot pressure port connected to the other oil inlet of high-pressure shuttle valve 6.

[0045] The overload protection valve 8 is a pilot relief valve in the prior art, and its remote control port is also provided with a proportional relief valve 9. The oil outlet of the proportional relief valve 9 is the MX port. By pressurizing the MX port, the pressure of the pilot relief valve can be controlled.

[0046] When the oil supply to port P stops, the actuator reverses and the size of the proportional relief valve 9 is adjusted to control the resistance of the actuator during reverse rotation. At the same time, a TPA port is also provided on the manual proportional valve block 1, through which oil is supplied to ensure the normal operation of the actuator.

[0047] The manual proportional valve block 1 is also equipped with a pressure reducing valve 17 and a manual reversing valve 10 for controlling the speed of the actuator. Oil from the oil inlet P1 is delivered to the manual reversing valve 10 through the pressure reducing valve 17. The two working oil ports of the manual reversing valve 10 are connected to the speed change ports of the actuator. The two working oil ports are TB for high-displacement output and TA for low-displacement output. The actuator connected to the manual reversing valve 10 is a two-speed motor.

[0048] The implementation principle of a manual proportional compound valve in the embodiment of the present application is as follows: oil flows through the pressure-compensating logic valve 5 and flows to the lead screw valve core inside the valve body. The external control oil port of the pressure-compensating logic valve 5 is connected to the T1 port. The pressure of the T port is fed back to the pressure-compensating logic valve 5, thereby controlling the increase or decrease of the flow rate through the pressure-compensating logic valve 5. When the oil flows to the inlet P of the sliding chamber, the integrated handle rod 43 can be manipulated to control the forward and reverse flow of the oil. At this time, an external oil circuit can be connected to the X port and the Y port respectively. When a pressure of 2-3 MPa is applied to the X port, the oil circuit flows in the forward direction, thereby controlling the forward rotation of the actuator; when a pressure of 2-3 MPa is applied to the Y port, the oil circuit flows in the reverse direction, thereby controlling the reverse rotation of the actuator. When the oil flows forward or reversely into one end of the high-pressure shuttle valve 6, it can be connected to the brake of the actuator through the V port to control the start and stop of the actuator; When the oil continues to flow to the balancing valve 7, the balancing valve 7 does not work. When the oil enters from the external control port of the balancing valve 7, it can achieve a safety protection effect on the actuator and prevent the actuator from falling out of control. The oil flows to the overload protection valve 8. By controlling the external MX port of the proportional relief valve 9, the pressure applied from the MX port can be controlled to control the pressure of the overload protection valve 8, thereby adjusting the tension of the actuator. When the oil supply from the P1 port stops, the actuator reverses, and the pressure of the proportional relief valve 9 is adjusted to control the resistance to the actuator's reverse rotation. At the same time, the TPA port supplies oil to ensure the normal operation of the actuator. When oil enters the P1 port, it flows through the pressure reducing valve 17, reaches the manual reversing valve 10, and is connected to the speed change port of the actuator, thereby realizing the speed change function of the actuator.

[0049] Example 2: In this example, except for installing a pressure relief structure 18 on the manual proportional valve block 1, the rest of the structure is consistent with that of Example 1.

[0050] Reference Figure 2 、 Figure 5 and Figure 6 The first reserved channel 14 includes an internal channel 141 connected to the extension chamber 121, an external channel 142 connected to the external pump body, and a pressure relief channel 143 for unloading oil. The structure of the second reserved channel 15 is consistent with that of the first reserved channel 14. This application will be described using the first reserved channel 14 as an example.

[0051] One end of the internal channel 141 communicates with the extension chamber 121, and the other end communicates with the middle of the external channel 142. One end of the pressure relief channel 143 communicates with the end of the external channel 142, and the other end communicates with the oil unloading port of the manual proportional valve block 1. The manual proportional valve block 1 is equipped with a pressure relief structure 18 at the connection between the external channel 142 and the internal channel 141. This structure ensures smoother sliding of the remote control lead screw valve core 2.

[0052] The internal channel 141 divides the external channel 142 into a first through-tube 1421 and a second through-tube 1422. The pressure relief block 181 seals against the inner wall of the first through-tube 1421. The pressure relief structure 18 includes the pressure relief block 181 and a pressure relief elastic member 182 that resets the pressure relief block 181. The pressure relief block 181 is cylindrical in shape, with its outer wall sealingly abutting against the first through-tube 1421. To further enhance the sealing effect, the inner wall of the first through-tube 1421 is further provided with an internal sealing ring 144. The outer wall of the pressure relief block 181 has a sealing ring groove 1811 that seals with the internal sealing ring 144.

[0053] The inner wall of the first through-tube 1421 has an internal mounting surface 1411. The pressure relief elastic member 182 is a tension spring, one end of which is fixed to the internal mounting surface 1411 and the other end to the end surface of the pressure relief block 181 facing away from the second through-tube 1422. The pressure relief block 181 includes a zigzag channel 1812 connecting the first through-tube 1421 and the internally connected channel 141. When the pressure relief elastic member 182 is in its normal state, one end of the zigzag channel 1812 abuts the inner wall of the first through-tube 1421, effectively sealing the first through-tube 1421 and the internally connected channel 141. When the external pump body applies pressure to the first through tube 1421, the pressure relief block 181 overcomes the pressure relief elastic member 182, and the pressure relief block 181 moves toward the second through tube 1422. When the output port of the folded channel 1812 corresponds to the internal channel 141, the oil flows from the first through tube 1421 to the internal channel 141, and finally flows to the extension chamber 121, thereby realizing the sliding of the screw valve core 2.

[0054] A communication notch 1813 is provided on the side of the pressure relief block 181 facing the second through-tube 1422. The inner diameter of the second through-tube 1422 is smaller than that of the first through-tube 1421. A sealing notch surface 1412 seals against the communication notch 1813 at the junction of the second through-tube 1422 and the internally connected channel 141. When the pressure relief elastic member 182 is in a normal state, the communication notch 1813 maintains communication between the second through-tube 1422 and the internally connected channel 141, allowing oil to be unloaded and pressure relieved through the communication notch 1813.

[0055] The end of the screw plug 16 has a pushing column 161 for pushing the pressure relief block 181. When the screw plug 16 is installed to the manual proportional valve block 1, the pushing column 161 pushes the pressure relief block 181 so that the pressure relief block 181 abuts against the sealing notch surface 1412, so that the internal channel 141 and the pressure relief channel 143 are sealed.

[0056] The pressure relief structure 18 has two states: pressure relief and pushing. When the pressure relief structure 18 is in the pressure relief state, the external channel 142 and the second through pipe 1422 are connected through the connecting notch 1813, that is, the internal channel 141 and the pressure relief channel 143 are connected; when the pressure relief structure 18 is in the pushing state, one of the external pump bodies applies pressure to the first through pipe 1421, causing the pressure relief blocks 181 of one group of the pressure relief structures 18 to slide, so that the second through pipe 1422 and the internal channel 141 are sealed.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A manual proportional compound valve, comprising a manual proportional valve block (1), a screw valve core (2), a return spring (3), and an operating assembly (4) for driving the screw valve core (2) to move, wherein the manual proportional valve block (1) has a sliding chamber (11) for the screw valve core (2) to slide, and is characterized in that: The manual proportional valve block (1) is provided with a handle block (12) and a spring block (13) at both ends of the sliding chamber (11), and the handle block (12) and the spring block (13) both have an extension chamber (121) communicating with the sliding chamber (11). The manual proportional valve block (1) is provided with a first reserved channel (14) and a second reserved channel (15), and the first reserved channel (14) and the second reserved channel (15) are communicated with the extension chamber (121) of the handle block (12) and the spring block (13), respectively. The first reserved channel (14) and the second reserved channel (15) are used to communicate with an external pump body to realize remote control of the screw valve core (2).

2. A manual proportional compound valve according to claim 1, characterized in that: The manual proportional valve block (1) is provided with a screw plug (16) for blocking the openings of the first reserved channel (14) and the second reserved channel (15).

3. A manual proportional compound valve according to claim 2, characterized in that: The first reserved channel (14) includes an internal channel (141) connected to the extension chamber (121), an external channel (142) connected to the external pump body, and a pressure relief channel (143); the input port of the internal channel (141) is connected to the side wall of the external channel (142), and the input port of the pressure relief channel (143) is connected to the end of the external channel (142); The manual proportional valve block (1) is provided with a pressure relief structure (18) at the connection point between the external channel (142) and the internal channel (141) in a sliding manner. The pressure relief structure (18) has two states: pressure relief and pushing. When the pressure relief structure (18) is in the pressure relief state, the internal channel (141) and the external channel (142) are sealed, and the external channel (142) and the pressure relief channel (143) are connected. When the pressure relief structure (18) is in the pushing state, the internal channel (141) and the external channel are connected, and the external channel (142) and the pressure relief channel (143) are sealed.

4. A manual proportional compound valve according to claim 3, characterized in that: The pressure relief structure (18) includes a pressure relief block (181) and a pressure relief elastic member (182) for driving the pressure relief block (181) to reset. The side of the pressure relief block (181) close to the input port of the internal channel (141) is in sealed contact with the inner wall of the internal channel (141). The side of the pressure relief block (181) close to the pressure relief channel (143) is provided with a connecting notch (1813). The connecting notch (1813) enables the internal channel (141) and the pressure relief channel (143) to be connected. The pressure relief block (181) is provided with a folding channel (1812) for connecting the internal channel (141) and the external channel (142).

5. A manual proportional compound valve according to claim 4, characterized in that: The inner wall of the internal channel (141) is provided with an internal mounting surface (1411), one end of the pressure relief elastic member (182) is fixed to the internal mounting surface (1411), and the other end is fixed to the end surface of the pressure relief block (181) away from the pressure relief channel (143), the inner wall of the internal channel (141) is provided with an internal sealing ring (144) for sealing against the outer wall of the pressure relief block (181), and the external channel (142) is provided with a sealing notch surface (1412) for sealing against the pressure relief block (181).

6. A manual proportional compound valve according to claim 4, characterized in that: A pushing column (161) for pushing the pressure relief block (181) is provided at the end of the screw plug (16).

7. A manual proportional compound valve according to claim 1, characterized in that: The manual proportional valve block (1) has an oil inlet P1 and an oil outlet T1 connected to the sliding chamber (11). The composite valve is provided with a pressure compensation logic valve (5) at the oil inlet P1. Oil flows to the sliding chamber (11) through the pressure compensation logic valve (5). The external control oil port of the pressure compensation logic valve (5) is connected to the oil outlet T1. The flow rate flowing through the pressure compensation logic valve (5) is increased or decreased by controlling the pressure at the oil outlet T1.

8. The manual proportional compound valve according to claim 1, characterized in that: The manual proportional valve block (1) is provided with a high-pressure shuttle valve (6) at the output port of the sliding chamber (11), and the working port of the high-pressure shuttle valve (6) is connected to the brake component of the actuator.

9. A manual proportional compound valve according to claim 8, characterized in that: It also includes a balancing valve (7) connected to the output end of the high-pressure shuttle valve (6) and an overload protection valve (8) connected to the external oil control port of the balancing valve (7). The overload protection valve (8) is a pilot relief valve, and the remote control port of the overload protection valve (8) is provided with a proportional relief valve (9).

10. The manual proportional compound valve according to claim 1, characterized in that: It also includes a pressure reducing valve (17) and a manual reversing valve (10), wherein the oil inlet of the pressure reducing valve (17) is connected to the oil outlet T1 of the manual proportional valve, and the manual reversing valve (10) is arranged at the oil outlet of the pressure reducing valve (17). The manual reversing valve (10) has a TB port for outputting a large displacement and a TA port for outputting a small displacement.

Images