A manually proportional composite valve

Abstract

The application relates to a manual proportional composite valve, which belongs to a control valve. The manual proportional composite valve comprises a manual proportional valve block, a screw valve core, a reset spring and an operation assembly for driving the screw valve core to move, the manual proportional valve block is provided with a sliding chamber for arranging the screw valve core to slide, the manual proportional valve block is respectively provided with a handle block and a spring block at two ends of the sliding chamber, the handle block and the spring block are both provided with an extension chamber in communication with the sliding chamber, the manual proportional valve block is provided with a first reserved channel and a second reserved channel, the first reserved channel and the second reserved channel are respectively in communication with the extension chambers of the handle block and the spring block, and the first reserved channel and the second reserved channel are used for being in communication with an external pump body to realize remote control of the screw valve core. The application integrates multiple functions for controlling an execution element in the manual proportional valve, and the space proportion is greatly reduced, and the cost is lowered.

Description

Technical Field

[0001] This application relates to a control valve, and more particularly to a manual proportional composite valve. Background Technology

[0002] Manually operated proportional valves are a special type of flow control valve. Their core characteristic is that the manual force applied by the operator (such as the force or angle of pressing or rotating the handle) has a linear or predictable proportional relationship with the valve opening, achieving precise, stable, and continuous flow control.

[0003] Existing manually operated proportional valves include a valve body, valve core, operating mechanism, transmission mechanism, return spring, and seals. 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 adjusts the position of the valve core within the valve body by rotating or pushing the operating mechanism, thereby regulating the valve opening. Manually operated proportional valves control the lifting actuators of anchor winches and hoists.

[0004] Regarding the aforementioned technologies, although existing manually operated proportional valves are simple in function, low in cost, and can achieve a basic proportional relationship between opening degree and operating force, their inherent functional limitations make them difficult to adapt to increasingly complex control requirements. Summary of the Invention

[0005] To meet increasingly complex control requirements, this application provides a manual proportional composite valve.

[0006] The manual proportional composite valve provided in this application adopts the following technical solution:

[0007] A manual proportional valve includes a manual proportional valve block, a lead screw valve core, a return spring, and an operating component for driving the lead screw valve core to move. The manual proportional valve block has a sliding chamber for the lead screw valve core to slide. A handle block and a spring block are respectively provided at both ends of the sliding chamber. Both the handle block and the spring block have an extension chamber communicating with the sliding chamber. The manual proportional valve block has a first reserved channel and a second reserved channel, which are respectively connected to the extension chambers of the handle block and the spring block. The first reserved channel and the second reserved channel are used to communicate with an external pump body to realize remote control of the lead screw valve core.

[0008] By adopting the above technical solution, the first and second reserved channels are connected to the external pump body to realize remote control of the screw valve core, enabling the manual proportional composite valve to adapt to more complex control needs in remote control mode and breaking through the functional limitations of the existing manual operation proportional valve.

[0009] Optionally, the manual proportional valve block is provided with a screw plug for sealing the openings of the first reserved channel and the second reserved channel.

[0010] By adopting the above technical solution, the openings of the first and second reserved channels are sealed with screw plugs, which can prevent impurities from entering the channels and ensure the normal operation of the manual proportional composite valve when it is not connected to the external pump body.

[0011] Optionally, the first reserved channel includes an inner channel connecting to the extension chamber, an outer channel connecting to the outer pump body, and a pressure relief channel. The inlet of the inner channel is connected to the side wall of the outer channel, and the inlet of the pressure relief channel is connected to the end of the outer channel.

[0012] The manual proportional valve block has a pressure relief structure that slides at the connection between the external and internal channels. The pressure relief structure has two states: pressure relief and pushing. When the pressure relief structure is in the pressure relief state, the internal and external channels are sealed, and the external channel is connected to the pressure relief channel. When the pressure relief structure is in the pushing state, the internal and external channels are connected, and the external channel is sealed to the pressure relief channel.

[0013] By adopting the above technical solution, and utilizing the interconnected structure of the inner channel, outer channel, and pressure relief channel of the first reserved channel, along with the sliding pressure relief structure and its different state switching, effective pressure regulation and stable operation of the screw valve core during remote control are achieved.

[0014] Optionally, the pressure relief structure includes a pressure relief block and a pressure relief elastic element for driving the pressure relief block to reset. The side of the pressure relief block near the input port of the inner channel is sealed against the inner wall of the inner channel. The side of the pressure relief block near the pressure relief channel is provided with a connecting notch, through which the inner channel and the pressure relief channel are connected. The pressure relief block has a folded channel for connecting the inner channel and the outer channel.

[0015] By adopting the above technical solution, and utilizing the pressure relief block and pressure relief elastic element, the connection and switching between the internal channel, external channel and pressure relief channel are realized. It can flexibly switch between the two states of pressure relief and push, thereby better adapting to the needs of remote control of the screw valve core under different working conditions.

[0016] Optionally, the inner wall of the inner channel is provided with an inner mounting surface, one end of the pressure relief elastic element is fixed to the inner 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 inner channel is provided with an inner sealing ring that seals against the outer wall of the pressure relief block, and the outer channel is provided with a sealing notch surface for sealing against the pressure relief block.

[0017] By adopting the above technical solution, the inner mounting surface can provide a stable mounting base for the pressure relief elastic element, enabling the pressure relief elastic element to function stably. The inner sealing ring can effectively prevent the medium in the inner channel from leaking from the outer wall of the pressure relief block, ensuring the sealing performance of the channel. The sealing notch surface can further improve the sealing performance between the outer channel and the pressure relief block.

[0018] Optionally, the end of the screw plug is provided with a push post for pushing the pressure relief block.

[0019] By adopting the above technical solution, when the manual proportional composite valve is not connected to the external pump body, the pressure relief block can be pushed to the pushing 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.

[0020] Optionally, the manual proportional valve block has an oil inlet P1 and an oil outlet T1 that connect to the sliding chamber. The manual proportional valve is provided with a pressure compensation logic valve at the oil inlet P1. The oil flows to the sliding chamber through the pressure compensation logic valve. The external control port of the pressure compensation logic valve is connected to the oil outlet T1. The flow rate through the pressure compensation logic valve is increased or decreased by controlling the pressure at the oil outlet T1.

[0021] By adopting the above technical solution, the oil inlet P1 and the oil outlet T1 are connected to the sliding chamber, which allows oil to flow in and out. By setting up a pressure compensation logic valve and connecting its external control port to the oil outlet T1, the flow rate through the pressure compensation logic valve can be controlled by the pressure at the oil outlet T1, thereby achieving precise, stable, and continuous control of the flow rate and improving the performance and adaptability of the manual proportional composite valve.

[0022] 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 braking element of the actuator.

[0023] By adopting the above technical solution, the high-pressure shuttle valve is set up and its working port is connected to the braking component of the actuator. The high-pressure shuttle valve can be used to select higher pressure oil to provide reliable pressure support for the braking component of the actuator, thereby realizing the braking function.

[0024] Optionally, it also includes a balance valve connected to the output end of the high-pressure shuttle valve and an overload protection valve connected to the external control port of the balance valve. The overload protection valve is a pilot relief valve, and the remote control port of the overload protection valve is equipped with a proportional relief valve.

[0025] By adopting the above technical solutions, the system pressure is stabilized and the flow is balanced; the overload protection valve is connected to the external control port of the balance valve, and a pilot relief valve is used as the overload protection valve, which can quickly respond and release pressure when the system pressure is too high, thus protecting the system safety; a proportional relief valve is set at the remote control port of the overload protection valve to achieve tension regulation.

[0026] Optionally, it also includes a pressure reducing valve and a manual directional valve. The oil inlet of the pressure reducing valve is connected to the T1 oil outlet of the manual proportional valve. The manual directional valve is located at the oil outlet of the pressure reducing valve and has a TB port for outputting a large displacement and a TA port for outputting a small displacement.

[0027] By adopting the above technical solution, the oil flowing out of the manual reversing valve outlet is depressurized, and the output of large or small displacement oil can be selected according to actual needs to meet the control requirements of flow rate under different working conditions and realize speed regulation.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] This application achieves near-ground control function through operating components, and can achieve remote control function by connecting an external pump body;

[0030] This application enables the braking and releasing function of the actuator by setting a high-pressure shuttle valve, and enables the tensioning function of the actuator by using a proportional relief valve;

[0031] This application enables dual-speed control of the actuator through a manual directional valve. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0033] Figure 2 This is a cross-sectional schematic diagram of the manual proportional valve block in Example 1.

[0034] Figure 3 This is a schematic diagram of the structure of the operating components in Embodiment 1.

[0035] Figure 4 This is the hydraulic schematic diagram of Example 1.

[0036] Figure 5 This is a schematic diagram of the pressure relief structure in Example 2 in the pressure relief state.

[0037] Figure 6 This is a schematic diagram of the pressure relief structure in the pushing state of Example 2.

[0038] Explanation of reference numerals in the attached drawings: 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 channel; 141. Internal channel; 1411. Internal mounting surface; 1412. Sealing notch surface; 142. External channel; 1421. First through pipe; 1422. Second through pipe; 143. Pressure relief channel; 144. Internal sealing ring; 15. Second reserved channel; 16. Screw plug; 161. Push column; 17. Pressure reducing valve; 18. Pressure relief structure; 181. Pressure relief block; 1811. Sealing ring groove; 1812. Bending channel; 1813. Connecting notch; 182. Pressure relief elastic element; 2. Screw valve core; 21. Drive through hole; 3. Return spring; 4. Operating component; 41. Handle shaft; 42. Direct push ball; 421. Connecting part; 422. Pushing part; 43. Handle lever; 5. Pressure compensation logic valve; 6. High-pressure shuttle valve; 7. Balance valve; 8. Overload protection valve; 9. Proportional relief valve; 10. Manual directional valve. Detailed Implementation

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" 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.

[0040] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0041] This application discloses a manual proportional composite valve.

[0042] Example 1: Refer to Figure 1 and Figure 2 A manual proportional composite valve includes a manual proportional valve block 1, a lead screw valve core 2, a return spring 3, and an operating component 4 for driving the lead screw valve core 2 to move.

[0043] The manual proportional valve block 1 has a sliding chamber 11 for the lead screw valve core 2 to slide through. Both ends of the sliding chamber 11 penetrate the opposite side walls of the manual proportional valve block 1. A handle block 12 and a spring block 13 are respectively installed at the openings at both ends 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 working ports, A and B, as well as an inlet port P and an outlet port T.

[0044] Combination Figure 3 The operating component 4 includes a handle shaft 41 rotatably mounted on the handle block 12, a push ball 42 disposed on the handle shaft 41 for pushing the lead screw valve core 2, and a handle lever 43 disposed 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 part 421 that is inserted and fixed to the handle shaft 41 and a pushing part 422 that is limited and arranged on the lead screw valve core 2. The pushing part 422 is generally spherical. The lead screw valve core 2 has a drive through hole 21 for the pushing part 422 to be inserted.

[0045] The return spring 3 is a compression spring, and spring washers 131 are installed inside the spring block 13 for the two ends of the return spring 3 to abut against each other. The two sets of spring washers 131 are connected by spring pins 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, it simultaneously drives the spring washers 131 and the spring pin 132 to move.

[0046] Reference Figure 4 To enable remote control of 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 an external pump body. The opening end of the first reserved channel 14 that connects to the external pump body is defined as port X. 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 an external pump body. The opening end of the second reserved channel 15 that connects to the external pump body is defined as port Y.

[0047] When remote control is performed, the external pump at port X is activated, applying a pressure of 2-3 MPa to port X. This causes oil to be delivered 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 lead screw valve core 2 to slide. Similarly, the external pump applies a pressure of 2-3 MPa to port Y, causing oil to be delivered from the second reserved channel 15 to the handle block 12. This increases the pressure in the extension chamber 121 of the spring block 13 and drives the lead screw valve core 2 to slide. When remote control is not required, a screw plug 16 can be installed at the open ends of the first and second reserved channels 14 and 15 to block them.

[0048] The manual proportional valve block 1 has an oil inlet P1 that connects to the P port of the sliding chamber 11 and an oil outlet T1 that connects to the T port of the sliding chamber 11. This application also includes a pressure compensation logic valve 5, which is arranged on the path between the oil inlet P1 and the sliding chamber. The oil inlet of the pressure compensation logic valve 5 faces P1, and the oil outlet faces the sliding chamber. The external control port of the pressure compensation logic valve 5 is connected to T1.

[0049] In this application, the oil enters through port P1, flows through pressure compensation logic valve 5, and then flows to sliding chamber 11. Pressure feedback is sent to pressure compensation logic valve 5 via port T1, thereby controlling the increase or decrease of the flow rate through pressure compensation logic valve 5. When the oil reaches the inlet of the lead screw valve core 2, the forward and reverse flow of the oil can be controlled by rotating the handle rod 43. Furthermore, the forward and reverse flow of the lead screw valve core 2 can be remotely controlled by connecting external pump body oil circuits at ports X and Y.

[0050] This application provides a high-pressure shuttle valve 6 at the working oil port of the sliding chamber 11. The two oil inlets of the high-pressure shuttle valve 6 are connected to working oil port A and working oil port B, respectively. The working port of the high-pressure shuttle valve 6 is a V-port, which is connected to the braking component of the actuator, thereby realizing the start and stop of the lead screw valve core 2. In this embodiment, the actuator is a hoisting device such as a winch or anchor winch.

[0051] In addition, the manual proportional valve block 1 is equipped with a balance valve 7 and an overload protection valve 8 that connects to the output port of the high-pressure shuttle valve 6 at the oil outlet of the high-pressure shuttle valve 6. The balance valve 7 is a pilot valve, with its valve port connected to one oil inlet of the high-pressure shuttle valve 6, its load port connected to the oil inlet of the overload protection valve 8, and its pilot pressure port connected to the other oil inlet of the high-pressure shuttle valve 6.

[0052] The overload protection valve 8 is a pilot relief valve of the prior art. Its remote control port is also equipped with a proportional relief valve 9. The oil outlet of the proportional relief valve 9 is port MX. By pressurizing port MX, the pressure of the pilot relief valve can be controlled.

[0053] When the P port stops supplying oil, the actuator reverses, adjusting the size of the proportional relief valve 9 to control the resistance encountered when the actuator reverses. Simultaneously, 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.

[0054] In addition, the manual proportional valve block 1 is also equipped with a pressure reducing valve 17 and a manual directional valve 10 for controlling the speed change of the actuator. The oil inlet P1 is supplied to the manual directional valve 10 through the pressure reducing valve 17. The two working ports of the manual directional valve 10 are respectively connected to the speed change port of the actuator. The two working ports are the TB port for outputting large displacement and the TA port for outputting small displacement. The actuator connected to the manual directional valve 10 is a dual-speed motor.

[0055] The implementation principle of a manual proportional composite valve in this application embodiment is as follows: the oil flows through the pressure compensation logic valve 5 to the screw valve core inside the valve body. The external control oil port of the pressure compensation logic valve 5 is connected to port T1. The pressure feedback from port T is given to the pressure compensation logic valve 5, thereby controlling the increase or decrease of the flow rate through the pressure compensation logic valve 5.

[0056] When the oil flows to the inlet P of the sliding chamber, the integrated handle 43 can be operated to control the forward and reverse flow of the oil. At this time, an external oil circuit can also 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 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 flows in the reverse direction, thereby controlling the reverse rotation of the actuator.

[0057] When oil flows in forward or backward to one end of the high-pressure shuttle valve 6, it can be connected to the brake of the actuator through the V port, which can control the start and stop of the actuator.

[0058] When the oil continues to flow to the balance valve 7, the balance valve 7 does not work. When the oil enters from the external control port of the balance valve 7, it can realize the safety protection of the actuator and prevent the actuator from falling uncontrollably.

[0059] When the oil flows to the overload protection valve 8, the pressure of the overload protection valve 8 can be controlled by adjusting the pressure at the MX port of the proportional relief valve 9, thereby regulating the tension of the actuator. When the oil supply to the P1 port stops, the actuator reverses, and the pressure of the proportional relief valve 9 is adjusted to control the resistance to the reverse rotation of the actuator. At the same time, the TPA port supplies oil to ensure the normal operation of the actuator.

[0060] When oil enters through port P1, it flows through pressure reducing valve 17 to manual directional valve 10, and is connected to the speed change port of the actuator, thus realizing the speed change function of the actuator.

[0061] Example 2: Except for the installation of the pressure relief structure 18 on the manual proportional valve block 1, the structure of this example is the same as that of Example 1.

[0062] Reference Figure 2 , Figure 5 and Figure 6 The first reserved channel 14 includes an internal channel 141 connecting to the extension chamber 121, an external channel 142 connecting to the external pump body, and a pressure relief channel 143 for unloading oil. The structure of the second reserved channel 15 is the same as that of the first reserved channel 14. This application will use the first reserved channel 14 as an example for description.

[0063] One end of the inner channel 141 is connected to the extension chamber 121, and the other end is connected to the middle of the outer channel 142. One end of the pressure relief channel 143 is connected to the end of the outer channel 142, and the other end is connected to the oil discharge port of the manual proportional valve block 1. A pressure relief structure 18 is installed at the connection between the outer channel 142 and the inner channel 141 of the manual proportional valve block 1, which makes the sliding of the remote control screw valve core 2 smoother.

[0064] The inner channel 141 divides the outer channel 142 into a first through pipe 1421 and a second through pipe 1422. The pressure relief block 181 and the inner wall of the first through pipe 1421 are sealed together. The pressure relief structure 18 includes a pressure relief block 181 and a pressure relief elastic element 182 that drives the pressure relief block 181 to reset. The pressure relief block 181 is cylindrical in shape, and its outer side wall is sealed to the first through pipe 1421. To further improve the sealing effect, the inner wall of the first through pipe 1421 is also provided with an inner sealing ring 144, and the outer side wall of the pressure relief block 181 has a sealing ring groove 1811 that cooperates with the inner sealing ring 144 for sealing.

[0065] The inner wall of the first conduit 1421 has an inner mounting surface 1411. The pressure relief elastic element 182 is a tension spring, with one end fixed to the inner mounting surface 1411 and the other end fixed to the end face of the pressure relief block 181 away from the second conduit 1422. The pressure relief block 181 has a folded channel 1812 for connecting the first conduit 1421 and the inner channel 141. In the normal state of the pressure relief elastic element 182, one end of the folded channel 1812 abuts against the inner wall of the first conduit 1421, that is, the first conduit 1421 and the inner channel 141 are in a sealed state. When the external pump body applies pressure to the first pipe 1421, the pressure relief block 181 overcomes the pressure relief elastic element 182 and moves toward the second pipe 1422. When the output port of the folded channel 1812 corresponds to the inner channel 141, the oil flows from the first pipe 1421 to the inner channel 141 and finally flows to the extension chamber 121, realizing the sliding of the screw valve core 2.

[0066] The pressure relief block 181 has a connecting notch 1813 on the side facing the second connecting pipe 1422, and the inner diameter of the second connecting pipe 1422 is smaller than that of the first connecting pipe 1421. The connection between the second connecting pipe 1422 and the inner channel 141 has a sealing notch surface 1412 that seals against the connecting notch 1813. In the normal state of the pressure relief elastic element 182, the second connecting pipe 1422 and the inner channel 141 are in a connected state through the connecting notch 1813, allowing oil to be discharged and pressure relieved through the connecting notch 1813.

[0067] The end of the screw plug 16 has a push post 161 for pushing the pressure relief block 181. When the screw plug 16 is installed to the manual proportional valve block 1, the push post 161 pushes the pressure relief block 181, causing the pressure relief block 181 to abut against the sealing notch surface 1412, thereby sealing the inner channel 141 and the pressure relief channel 143.

[0068] 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 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 pipe 1421, causing the pressure relief block 181 of one set of pressure relief structures 18 to slide, thereby sealing the second pipe 1422 and the internal channel 141.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manual proportional composite valve, comprising a manual proportional valve block (1), a lead screw valve core (2), a return spring (3), and an operating assembly (4) for moving the lead screw valve core (2), wherein the manual proportional valve block (1) has a sliding chamber (11) for sliding arrangement of the lead screw valve core (2), 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). The handle block (12) and the spring block (13) each have an extension chamber (121) that communicates 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). The first reserved channel (14) and the second reserved channel (15) communicate 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). The manual proportional valve block (1) is provided with a screw plug (16) for sealing the openings of the first reserved channel (14) and the second reserved channel (15). The first reserved channel (14) includes an inner channel (141) connecting to the extension chamber (121), an outer channel (142) connecting to the outer pump body, and a pressure relief channel (143). The inlet of the inner channel (141) is connected to the side wall of the outer channel (142), and the inlet of the pressure relief channel (143) is connected to the end of the outer channel (142). The manual proportional valve block (1) has a pressure relief structure (18) that slides at the connection between the external channel (142) and the internal channel (141). 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.

2. The manual proportional composite valve according to claim 1, characterized in that, The pressure relief structure (18) includes a pressure relief block (181) and a pressure relief elastic element (182) for driving the pressure relief block (181) to reset. The side of the pressure relief block (181) near the input port of the inner channel (141) is sealed against the inner wall of the inner channel (141). The side of the pressure relief block (181) near the pressure relief channel (143) is provided with a connecting notch (1813). The inner channel (141) and the pressure relief channel (143) are connected through the connecting notch (1813). The pressure relief block (181) has a folded channel (1812) for connecting the inner channel (141) and the outer channel (142).

3. A manual proportional composite valve according to claim 2, characterized in that, The inner wall of the inner channel (141) is provided with an inner mounting surface (1411). One end of the pressure relief elastic element (182) is fixed to the inner mounting surface (1411), and the other end is fixed to the end face of the pressure relief block (181) away from the pressure relief channel (143). The inner wall of the inner channel (141) is provided with an inner sealing ring (144) that seals against the outer wall of the pressure relief block (181). The outer channel (142) is provided with a sealing notch surface (1412) for sealing against the pressure relief block (181).

4. A manual proportional composite valve according to claim 2, characterized in that, The end of the screw plug (16) is provided with a push post (161) for pushing the pressure relief block (181).

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

6. A manual proportional composite 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 braking component of the actuator.

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

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

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