Position valve

Abstract

This invention relates to the field of position valve technology and discloses a position valve, comprising: a hydraulic valve body with a spool valve channel inside; a spool valve slidably disposed within the spool valve channel for adjusting the opening of the oil port; a spring, one end of which abuts against one end of the spool valve, and the other end of which is fixedly connected to one end of the hydraulic valve body for providing elastic force balanced with oil pressure; and an electromagnetic drive assembly including an electromagnet and an electrically driven spool valve. The electromagnet drives the electrically driven spool valve to move axially through a magnetic field. The head of the electrically driven spool valve has an arc-shaped contact surface. This position valve ensures the linearity of the spool valve's movement trajectory and the stability of the thrust transmission through the electrically driven spool valve. Simultaneously, through a first positioner and a second positioner, the hydraulic actuator can maintain stable output under high-speed and high-load conditions, thereby improving the valve's working efficiency and performance.

Description

Technical Field

[0001] This invention relates to the field of position valve technology, specifically position valves. Background Technology

[0002] A position valve is a device used to control the direction of fluid flow in a hydraulic or pneumatic system. It achieves precise control of hydraulic cylinders or pneumatic actuators by changing the open or closed state of the fluid passage. Position valves typically have multiple operating positions, allowing switching between different channels as needed to achieve various control functions.

[0003] Traditional mechanical hydraulic systems mostly achieve opening adjustment through a simple balance between springs and oil pressure. However, due to the insufficient wear resistance of valve body materials, uneven thrust transmission of spool valve drive structures, and weak resistance to pressure fluctuations in the sealing system, the system is prone to over-adjustment and hysteresis during high-speed response. At the same time, a single electronic positioner cannot simultaneously address zero-position drift compensation, vibration suppression, and multi-parameter collaborative optimization, causing the control accuracy of the hydraulic actuator to drop sharply under complex working conditions (such as high-frequency impact, drastic temperature changes, or corrosive media environments). The risk of leakage caused by seal failure increases significantly. Therefore, we urgently need a position valve. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the present invention aims to provide a position valve to solve the problems mentioned in the background art. Traditional mechanical hydraulic systems mostly achieve opening adjustment through a simple balance between springs and oil pressure. However, due to insufficient wear resistance of valve body materials, uneven thrust transmission of the spool valve drive structure, and weak pressure fluctuation resistance of the sealing system, the system is prone to over-adjustment and hysteresis during high-speed response. At the same time, a single electronic positioner cannot simultaneously address zero-position drift compensation, vibration suppression, and multi-parameter collaborative optimization, causing the control accuracy of the hydraulic actuator to drop sharply under complex working conditions (such as high-frequency impact, drastic temperature changes, or corrosive media environments), and significantly increasing the risk of leakage caused by seal failure.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a position valve, comprising: A hydraulic valve body, wherein a slide valve passage is provided inside the hydraulic valve body; A slide valve, which is slidably disposed within the slide valve channel, is used to adjust the opening degree of the oil port; A spring, one end of which abuts against one end of the slide valve, and the other end of which is fixedly connected to one end of the hydraulic valve body, is used to provide elastic force that is balanced with oil pressure; An electromagnetic drive assembly includes an electromagnet and an electrically driven slide valve. The electromagnet drives the electrically driven slide valve to move axially through a magnetic field. The head of the electrically driven slide valve is provided with an arc-shaped contact surface, which forms a surface contact with the tail of the slide valve to uniformly transmit thrust, thereby pushing the slide valve and compressing the spring. A first locator and a second locator, wherein one end of the first locator is electrically connected to a circuit board.

[0006] Preferably, the hydraulic valve body is made of ductile iron, and the other end of the circuit board is electrically connected to one end of the electromagnet.

[0007] Preferably, the circuit board is externally mounted with an electrical mounting housing made of aluminum alloy, and the electromagnet and the electrically actuated slide valve are both disposed inside the electrical mounting housing.

[0008] Preferably, one end of the slide valve is provided with a manual mechanism, which includes a worm gear transmission assembly and a mechanical dial. The worm gear is covered with a dust cover and locked by a first internal hex screw.

[0009] Preferably, a first cover plate is installed at one end of the hydraulic valve body, the contact surface between the first cover plate and the hydraulic valve body is provided with an annular groove, a first O-ring is installed inside the annular groove, a second hexagon screw is provided on the outside of the first cover plate, and a third O-ring is provided on the outside of the hydraulic valve body.

[0010] Preferably, a second O-ring is provided between the hydraulic valve body and the electrical installation housing, and a connector is threaded to one end of the electrical installation housing, the connector having a waterproof gland inside.

[0011] Preferably, the end of the slide valve channel is provided with a stepped limiting groove, and an elastic retaining ring for holes is installed in the limiting groove.

[0012] Preferably, a second cover plate is fixedly connected to one end of the first positioner, and one end of the second cover plate is threadedly connected to one end of the electrical mounting housing.

[0013] Preferably, four second positioners are provided, and the four second positioners are respectively used for zero-position calibration, full-scale limit, vibration suppression, and PID parameter adjustment. Compared with the prior art, the beneficial effects achieved by the present invention are: First, the hydraulic valve body of this invention serves as the basic structure, with a precision-machined spool valve channel inside. The spool valve is embedded within this channel with a clearance fit, and its axial displacement directly controls the opening of the oil port, thereby affecting the oil pressure distribution. The spring is manufactured using high-precision wire diameter and heat treatment processes. One end of the spring is in rigid contact with the spool valve, while the other end is anchored to the inner wall of the hydraulic valve body. An initial elastic force is formed through a preset compression amount, dynamically balancing with the system oil pressure in real time. This design effectively counteracts spool valve drift caused by oil pressure fluctuations, fundamentally suppressing the over-adjustment phenomenon and action lag of the hydraulic actuator. The electromagnetic drive component is the core power source. The electromagnet uses low-power, high-permeability materials. After receiving a 4-20mA control signal and a 24VDC power supply, it generates a linearly changing magnetic field strength, driving the electrically driven spool valve to move axially. The head of the electrically driven spool valve is innovatively designed as an arc-shaped contact surface, forming a uniform contact with the tail plane of the spool valve in the entire circumference. This avoids the local stress concentration and thrust deviation caused by traditional point contact, ensuring the linearity of the spool valve's movement trajectory and the transmission of thrust. To ensure stability, the spool valve compresses the spring, creating a closed-loop balance system between magnetic force, oil pressure, and elasticity. This allows for precise adjustment of the oil port opening. The first positioner, integrated with a high-precision potentiometer and circuit board, collects the spool valve displacement feedback signal in real time and dynamically corrects the control command using a PID algorithm, achieving micron-level adjustment accuracy. The second positioner employs a four-channel independent design, corresponding to zero-position calibration, full-scale limit, vibration suppression, and PID parameter tuning functions. Zero-position calibration eliminates assembly tolerances through mechanical fine-tuning, while full-scale limit employs dual protection with both hard and electronic limits. The vibration suppression module integrates an adaptive filtering algorithm, and PID parameter tuning supports online dynamic optimization. This multi-level adjustment mechanism works collaboratively, ensuring stable output of the hydraulic actuator even under high-speed and high-load conditions. Through precise mechanical structure matching, dynamic balance of the hydraulic system, and intelligent feedback from electrical control, millisecond-level response and long-cycle stable operation of the hydraulic actuator opening are achieved, thereby improving the working efficiency and performance of the position valve.

[0014] Secondly, in this invention, the hydraulic valve body is made of ductile iron, which has high wear resistance and extends the valve body's lifespan. At the same time, it is combined with the special nitrided surface of the slide valve to reduce frictional loss and ensure smooth movement of the slide valve in the channel. The circuit board is directly electrically connected to the electromagnet, which shortens the signal transmission path and improves the electromagnetic response speed. Combined with the structural design of the hydraulic valve body, it further suppresses the over-adjustment phenomenon caused by oil pressure fluctuations.

[0015] Third, the slide valve of the present invention integrates a manual mechanism at one end, including a worm gear transmission assembly and a mechanical dial. The worm is covered by a dust cover and locked by a first internal hexagon screw. In the event of power failure or emergency, the position of the slide valve can be manually and accurately adjusted. The dial provides intuitive displacement feedback, ensuring compatibility between manual operation and automatic control, and enhancing the redundancy and safety of the system.

[0016] Fourth, the circuit used in this invention is integrated, which integrates the original two circuit boards into one circuit board, thereby shortening the response time and improving the sensitivity.

[0017] Fifth, the positioner is a set-type device that can be flexibly adjusted.

[0018] Sixth, the electrical and hydraulic components are grouted to prevent the oil circuit from affecting the electrical circuit, thereby improving safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the second positioner in this invention; Figure 3 This is a schematic diagram of the structure of the third O-ring seal of the present invention; Figure 4 This is a schematic diagram illustrating the operating principle of the present invention; The components are: 1. Second hex socket head cap screw; 2. First cover plate; 3. First O-ring seal; 4. Slide valve; 5. Spring; 6. Hydraulic valve body; 7. Hole retaining ring; 8. Second O-ring seal; 12. Electrical mounting housing; 13. Circuit board; 15. Electromagnet; 18. First hex socket head cap screw; 19. Manual mechanism; 20. Second cover plate; 23. First positioner; 26. Electrically actuated slide valve; 27. Connector; 29. ​​Second positioner; 32. Third O-ring seal. Detailed Implementation

[0020] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0021] The following is a detailed implementation of the position valve.

[0022] Please see Figure 1-4 Position valve, including: Hydraulic valve body 6, with a slide valve passage inside; Slide valve 4 is slidably disposed in the slide valve channel and is used to adjust the opening of the oil port; Spring 5, one end of spring 5 abuts against one end of slide valve 4, and the other end of spring 5 is fixedly connected to one end of hydraulic valve body 6, used to provide elastic force to balance oil pressure; The electromagnetic drive assembly includes an electromagnet 15 and an electrically driven slide valve 26. The electromagnet 15 drives the electrically driven slide valve 26 to move axially through a magnetic field. The head of the electrically driven slide valve 26 is provided with an arc-shaped contact surface, which forms a surface contact with the tail of the slide valve 4 to uniformly transmit thrust, thereby pushing the slide valve 4 and the compression spring 5. First positioner 23 and second positioner 29, one end of first positioner 23 is electrically connected to circuit board 13.

[0023] Through the above technical solution, high-precision dynamic control is achieved through multi-system integration. The hydraulic valve body 6 serves as the basic structure, with a precision-machined spool valve channel inside. The spool valve 4 is embedded within it with a clearance fit, and its axial displacement directly controls the oil port opening, thus affecting the oil pressure distribution. The spring 5 is manufactured using high-precision wire diameter and heat treatment processes. One end of the spring is in rigid contact with the spool valve 4, while the other end is anchored to the inner wall of the hydraulic valve body 6. An initial elastic force is formed through a preset compression amount, dynamically balancing with the system oil pressure in real time. This design effectively counteracts the effects of oil pressure fluctuations. The drift of spool valve 4 is addressed by fundamentally suppressing over-adjustment and lag in the hydraulic actuator. The electromagnetic drive component is the core power source. Electromagnet 15 uses low-power, high-permeability materials. Upon receiving a 4-20mA control signal and a 24VDC power supply, it generates a linearly varying magnetic field strength, driving the electrically actuated spool valve 26 to move axially. The head of the electrically actuated spool valve 26 is innovatively designed with an arc-shaped contact surface, forming a uniform circumferential contact with the tail plane of spool valve 4. This avoids localized stress concentration and thrust deviation caused by traditional point contact, ensuring the smooth operation of spool valve 4. The linearity of the motion trajectory and the stability of the thrust transmission are achieved through the compression of the spring 5 by the slide valve 4, which forms a closed-loop balance system with magnetic force, oil pressure and elastic force, thereby precisely adjusting the oil port opening. The first positioner 23 is integrated with the circuit board 13 through a high-precision potentiometer to collect the displacement feedback signal of the slide valve 4 in real time and dynamically corrects the control command through the PID algorithm to achieve micron-level adjustment accuracy. The second positioner 29 adopts a four-channel independent design, which corresponds to the zero-position calibration, full-scale limit, vibration suppression and PID parameter tuning functions respectively. The zero-position calibration eliminates assembly tolerances through mechanical fine adjustment, the full-scale limit adopts dual protection of hard limit and electronic limit, the vibration suppression module integrates an adaptive filtering algorithm, and the PID parameter tuning supports online dynamic optimization. The multi-level adjustment mechanism works in concert to enable the hydraulic actuator to maintain stable output under high-speed and high-load conditions. Through the precise matching of the mechanical structure, the dynamic balance of the hydraulic system and the intelligent feedback of the electrical control, the millisecond-level response and long-cycle stable operation of the hydraulic actuator opening are achieved, thereby improving the working efficiency and performance of the position valve.

[0024] Specifically, the hydraulic valve body 6 is made of ductile iron, and the other end of the circuit board 13 is electrically connected to one end of the electromagnet 15.

[0025] Through the above technical solution, the hydraulic valve body 6 is made of ductile iron, which has high wear resistance and extends the valve body life. At the same time, it is matched with the special nitrided surface of the slide valve 4 to reduce friction loss and ensure that the slide valve 4 moves smoothly in the channel. The circuit board 13 is directly electrically connected to the electromagnet 15, which shortens the signal transmission path and improves the electromagnetic response speed. Combined with the structural design of the hydraulic valve body 6, it further suppresses the over-adjustment phenomenon caused by oil pressure fluctuation.

[0026] Specifically, the circuit board 13 is externally mounted with an electrical mounting housing 12, which is made of aluminum alloy. The electromagnet 15 and the electrically actuated slide valve 26 are both located inside the electrical mounting housing 12.

[0027] Through the above technical solution, the electrical installation housing 12 is made of aluminum alloy, which is lightweight and has excellent heat dissipation. The internal encapsulated circuit board 13 and electromagnet 15 isolate external air and oil, reducing the risk of circuit heating and short circuit. A second O-ring seal 8 is set between the housing and the hydraulic valve body 6, which, together with the threaded waterproof connector 27, forms a double sealing barrier, completely isolating the hydraulic oil from the electrical components, preventing oil leakage and improving system reliability.

[0028] Specifically, one end of the slide valve 4 is provided with a manual mechanism 19, which includes a worm gear transmission assembly and a mechanical dial. The worm gear is covered with a dust cover and locked by a first internal hex screw 18.

[0029] Through the above technical solution, one end of the slide valve 4 integrates a manual mechanism 19, which includes a worm gear transmission assembly and a mechanical dial. The worm is covered by a dust cover and locked by the first internal hex screw 18. In the event of power failure or emergency, the position of the slide valve 4 can be manually and precisely adjusted. The dial provides intuitive displacement feedback, ensuring compatibility between manual operation and automatic control, and enhancing the system's redundancy and safety.

[0030] Specifically, a first cover plate 2 is installed at one end of the hydraulic valve body 6. The contact surface between the first cover plate 2 and the hydraulic valve body 6 is provided with an annular groove. A first O-ring seal 3 is installed inside the annular groove. A second internal hexagon screw 1 is provided on the outside of the first cover plate 2. A third O-ring seal 32 is provided on the outside of the hydraulic valve body 6.

[0031] Through the above technical solution, the first cover plate 2 is fixed at one end of the hydraulic valve body 6 by the second internal hexagon screw 1. The first O-ring 3 is embedded in the annular groove of the contact surface between the cover plate and the valve body to form a static seal and prevent oil leakage from the slide valve channel. The third O-ring 32 on the outside of the valve body further isolates external contaminants. The multi-stage sealing design ensures the cleanliness and long-term sealing performance of the hydraulic system.

[0032] Specifically, a second O-ring 8 is provided between the hydraulic valve body 6 and the electrical installation housing 12, and a connector 27 is threaded to one end of the electrical installation housing 12, with a waterproof gland inside the connector 27.

[0033] Through the above technical solution, the hydraulic valve body 6 and the electrical installation housing 12 are dynamically and statically sealed and isolated by the second O-ring seal 8 to prevent oil from seeping into the electrical cavity; the threaded connection connector 27 has a built-in waterproof gland to ensure reliable sealing when the cable is introduced, avoid moisture or oil mist from corroding the circuit, and maintain the stable operation of the electrical system.

[0034] Specifically, a stepped limiting groove is provided at the end of the slide valve channel, and an elastic retaining ring 7 for holes is installed in the limiting groove.

[0035] Through the above technical solution, a stepped limiting groove is set at the end of the slide valve channel, and an elastic retaining ring 7 is used in the built-in hole to limit the axial displacement range of the slide valve 4, prevent the slide valve 4 from falling off or getting stuck due to overtravel, and at the same time, the buffering characteristics of the elastic retaining ring reduce the impact of the slide valve 4 movement and extend the component life.

[0036] Specifically, one end of the first positioner 23 is fixedly connected to a second cover plate 20, and one end of the second cover plate 20 is threadedly connected to one end of the electrical mounting housing 12.

[0037] Through the above technical solution, the first positioner 23 is fixed to the electrical installation housing 12 by the second cover plate 20. The cover plate is threadedly connected to the housing to ensure that the positioner is installed firmly and to avoid parameter deviation caused by vibration. The positioner is directly electrically connected to the circuit board 13 to provide real-time feedback of adjustment signals and ensure the consistency of control accuracy under dynamic working conditions.

[0038] Specifically, there are four second positioners 29, which are used for zero-position calibration, full-scale limit, vibration suppression and PID parameter adjustment, respectively.

[0039] Through the above technical solution, the four second positioners 29 independently adjust the zero position, full scale, vibration suppression and PID parameters respectively. Through multi-dimensional collaborative calibration, the load characteristics of the hydraulic motor are accurately matched; zero position calibration eliminates mechanical deviation, full scale limit prevents overpressure, vibration suppression reduces high-frequency disturbances, and PID adjustment optimizes dynamic response, ultimately achieving high stability and fast response capability of the system under all working conditions.

[0040] Although specific embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these specific embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seat valve characterized by, include: The hydraulic valve body (6) has a slide valve passage inside. A slide valve (4) is slidably disposed in the slide valve channel for adjusting the opening of the oil port; Spring (5), one end of which abuts against one end of the slide valve (4), and the other end of which is fixedly connected to one end of the hydraulic valve body (6) to provide elastic force balanced with oil pressure; The electromagnetic drive assembly includes an electromagnet (15) and an electrically driven slide valve (26). The electromagnet (15) drives the electrically driven slide valve (26) to move axially through a magnetic field. The head of the electrically driven slide valve (26) is provided with an arc-shaped contact surface, which forms a surface contact with the tail of the slide valve (4) to uniformly transmit thrust, thereby pushing the slide valve (4) and the compression spring (5). A first locator (23) and a second locator (29), wherein one end of the first locator (23) is electrically connected to a circuit board (13).

2. The position valve of claim 1, wherein: The hydraulic valve body (6) is made of ductile iron, and the other end of the circuit board (13) is electrically connected to one end of the electromagnet (15).

3. The position valve of claim 2, wherein: The circuit board (13) is externally mounted with an electrical mounting housing (12), which is made of aluminum alloy. The electromagnet (15) and the electrically driven slide valve (26) are both located inside the electrical mounting housing (12).

4. The position valve of claim 1, wherein: One end of the slide valve (4) is provided with a manual mechanism (19), which includes a worm gear transmission assembly and a mechanical dial. The worm gear is covered with a dust cover and locked by a first internal hexagon screw (18).

5. The position valve of claim 1, wherein: A first cover plate (2) is installed at one end of the hydraulic valve body (6). The contact surface between the first cover plate (2) and the hydraulic valve body (6) is provided with an annular groove. A first O-ring seal (3) is installed inside the annular groove. A second internal hexagon screw (1) is provided on the outside of the first cover plate (2). A third O-ring seal (32) is provided on the outside of the hydraulic valve body (6).

6. The position valve of claim 1, wherein: A second O-ring (8) is provided between the hydraulic valve body (6) and the electrical installation housing (12). One end of the electrical installation housing (12) is threaded with a connector (27), and a waterproof gland is provided inside the connector (27).

7. The position valve of claim 1, wherein: The end of the slide valve channel is provided with a stepped limiting groove, and a hole elastic retaining ring (7) is installed in the limiting groove.

8. The position valve of claim 1, wherein: One end of the first positioner (23) is fixedly connected to a second cover plate (20), and one end of the second cover plate (20) is threadedly connected to one end of the electrical installation housing (12).

9. The position valve of claim 1, wherein: The second positioner (29) is provided in four parts, and the four second positioners (29) are respectively used for zero position calibration, full scale limit, vibration suppression and PID parameter adjustment.

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