Switch electromagnetic valve and working method

Abstract

The invention provides a switch electromagnetic valve and a working method, relates to the field of electromagnetic valves, and aims to solve the problem that the reliability is influenced by long reset response time of a cone valve core due to the hysteresis phenomenon of an electromagnet serving as a driving element in the conventional electromagnetic valve. A spring seat is mounted at one end of a valve sleeve, and a first spring is mounted between the spring seat and the cone valve core; the first spring resists the oil pressure borne by the cone valve element from the first oil duct, so that the cone valve element is in a normally closed state, the cone valve element can be ensured to quickly reset to cut off an oil way when an electromagnetic driving mechanism of the electromagnetic valve loses power, the reset reversing function of the electromagnetic valve is enhanced, the problem that reset is not timely due to hysteresis of an electromagnet is solved, and the service life of the electromagnetic valve is prolonged. The reliability of the electromagnetic valve is improved, backflow of a load oil way and a driving oil way is blocked in time, the stability of action of a load end is improved, the electromagnetic valve is suitable for heavy-load working environments such as forklifts, and equipment operation is safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the field of solenoid valves, and particularly to a switching solenoid valve and a working method thereof. Background Art

[0002] A solenoid valve is a basic automation component used to control fluids in a hydraulic system. It belongs to an actuator that converts the input electrical signal into mechanical motion to control the flow direction of the liquid in the hydraulic system. As a control component widely used in hydraulic and pneumatic systems, although a switching solenoid valve performs well in controlling the on-off of fluids, there are still some deficiencies, which may have an important impact on the performance, reliability, and lifespan of the system in different application scenarios. Common structures of switching solenoid valves include direct-acting type, pilot-operated type, spool type, etc.

[0003] A Chinese patent (publication number CN203571176U, publication date April 30, 2014) discloses a two-way two-port solenoid valve, which is a direct-acting solenoid valve. A fixed iron is fixedly arranged at one end of the guide sleeve, and a moving iron is slidably arranged in the cavity of the guide sleeve; the valve sleeve is fixedly arranged at one end of the guide sleeve, and the valve sleeve has a cavity communicating with the cavity of the guide sleeve. A first oil port and a second oil port communicating with the cavity of the valve sleeve are respectively opened at the end and the side wall of the valve sleeve. The tapered valve core extends into the main valve core so that the other end of the tapered valve core and the oil inlet hole of the main valve core cooperate to achieve one-way oil inlet. It can be applied to various mechanical equipment and hydraulic systems with high working pressure, large flow rate, and high integration requirements; however, as the driving element, the electromagnet will affect the action efficiency of the tapered valve core due to magnetic hysteresis, resulting in a long reset response time of the main valve core and poor reliability of the solenoid valve. For a heavy-duty working environment such as a forklift, the slow reset action of the main valve core will cause the load oil circuit to flow back to the driving oil circuit through the solenoid valve, resulting in action fluctuations at the load end, affecting the stability, reliability, and safety of the load end and unable to meet the requirements of the load. Summary of the Invention

[0004] The purpose of the present invention is to address the defects existing in the prior art and provide a switching solenoid valve and a working method thereof. A spring seat is installed at one end of the valve sleeve, and a first spring is installed between the spring seat and the tapered valve core. The first spring resists the oil pressure from the first oil passage borne by the tapered valve core, keeping the tapered valve core in a normally closed state. When the electromagnetic drive mechanism of the solenoid valve loses power, it can ensure the rapid reset of the tapered valve core to cut off the oil circuit, enhance the reset and commutation function of the solenoid valve, reduce the problem of untimely reset caused by the magnetic hysteresis of the electromagnet, and improve the reliability of the solenoid valve.

[0005] The first object of the present invention is to provide a switching solenoid valve, adopting the following scheme:

[0006] Including:

[0007] The valve body is provided with a first oil passage and a second oil passage that communicate through a valve cavity;

[0008] The conical valve core is slidably installed in the valve cavity. By sliding, the first oil passage and the valve cavity are cut off or communicated. The conical valve core is internally provided with a pressure relief cavity and a pressure relief port that communicate with the second oil passage. The pressure relief cavity communicates with the first oil passage through the pressure relief port;

[0009] The valve sleeve is installed on the valve body. One end of the valve sleeve facing the valve body is provided with a spring seat. A first spring is installed between the spring seat and the conical valve core. The first spring resists the oil pressure from the first oil passage borne by the conical valve core to keep the conical valve core in a normally closed state; The spring seat is slidably fitted with a push rod. One end of the push rod is connected to the electromagnetic drive mechanism, and the other end serves as a sealing end and extends into the pressure relief cavity. The sealing end blocks and opens the pressure relief port by driving the movement of the push rod by the electromagnetic drive mechanism.

[0010] Further, a conical surface seal is formed at the position where the sealing end blocks the pressure relief port.

[0011] Further, along the telescopic direction of the first spring, one end of the first spring abuts against the spring seat, and the other end abuts against the conical valve core.

[0012] Further, one end of the first spring extends into the pressure relief cavity of the conical valve core, and the first spring is sleeved outside the push rod.

[0013] Further, the spring seat is provided with a sliding hole, and the push rod is slidably fitted with the sliding hole, and the fitting position is between the two ends of the push rod.

[0014] Further, the electromagnetic drive mechanism includes an armature and a coil. An installation hole is provided in the valve sleeve. The armature is slidably fitted in the installation hole. One end of the push rod is connected to the armature, and the other end extends outside the installation hole. A second spring is installed between the armature and the bottom of the installation hole. The coil and the second spring jointly act on the outside of the armature to drive the armature to slide along the installation hole.

[0015] Further, one end of the installation hole is an opening for the push rod to protrude, and the other end is a blocking end as the bottom of the hole, and the spring seat is fitted at the opening of the installation hole.

[0016] Further, the armature is a proportional adjustment iron core, and the coil is fixed to the valve sleeve.

[0017] The second object of the present invention is to provide a working method of a switching solenoid valve, using the switching solenoid valve as described in the first object, including:

[0018] After the electromagnetic drive mechanism is powered on, it drives the push rod to release the blockage of the pressure relief port, and the pressure relief cavity communicates with the first oil passage to relieve pressure;

[0019] The hydraulic oil in the first oil passage overcomes the elastic force of the first spring to push the cone valve core to move, enabling the first oil passage to communicate with the second oil passage through the valve cavity, establishing the circulation of the hydraulic oil, and performing the action.

[0020] After the electromagnetic drive mechanism loses power, the first spring drives the cone valve core to quickly reset so that the first oil passage and the valve cavity are cut off, and the action execution stops; the electromagnetic drive mechanism after losing power drives the ejector rod to establish a seal for the pressure relief port, cutting off the connection between the pressure relief cavity and the first oil passage, and waiting for the electromagnetic drive mechanism to be powered on.

[0021] Further, after the cone valve core cuts off the connection between the first oil passage and the valve cavity, the return flow of the second oil passage through the valve cavity to the first oil passage is blocked.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] Aiming at the problem that the electromagnet as a driving element in the current solenoid valve has hysteresis phenomenon, resulting in a long response time for the reset of the cone valve core and affecting the reliability, a spring seat is installed at one end of the valve sleeve, and a first spring is installed between the spring seat and the cone valve core. The first spring resists the oil pressure from the first oil passage borne by the cone valve core, keeping the cone valve core in a normally closed state. When the electromagnetic drive mechanism of the solenoid valve loses power, it can ensure that the cone valve core quickly resets to cut off the oil circuit, enhancing the reset and commutation function of the solenoid valve, reducing the problem of untimely reset caused by the hysteresis of the electromagnet, improving the reliability of the solenoid valve, timely blocking the return flow of the load oil circuit to the driving oil circuit, and improving the stability of the load end action. It is applicable to heavy-duty working environments such as forklifts, and the operation of the equipment is safer and more reliable.

[0024] In a complex hydraulic system working environment, if the ejector rod is tilted, it will cause a deviation in the fit between its sealing end and the pressure relief port, affecting the normal sealing and opening of the pressure relief port and reducing the accuracy of solenoid valve control. By cooperating with the spring seat at the opening of the installation hole, the spring seat can fix the direction of the ejector rod, effectively preventing the ejector rod from tilting, ensuring that the ejector rod can always move along a predetermined straight-line trajectory, stably realizing the sealing and opening operations of the pressure relief port, and further realizing the precise control of the movement of the cone valve core, improving the accuracy of the solenoid valve in controlling the on-off of the oil circuit, and meeting the requirements of various mechanical equipment and hydraulic systems with high requirements for hydraulic control accuracy.

[0025] The moving iron of the proportional adjustment iron core can flexibly change its own working characteristics by adjusting the current of the input coil, realizing functions such as flow regulation, switch regulation, and proportional regulation to adapt to the flow control requirements under different working conditions, enabling the hydraulic system to accurately control the movement speed and force of the actuator according to actual needs during operation, and improving the control accuracy and working stability of the system. Description of the Drawings

[0026] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 Schematic diagram of the ejector rod blocking the pressure relief port in one or more embodiments of the present invention.

[0028] Figure 2 Schematic diagram of the ejector rod opening the pressure relief port in one or more embodiments of the present invention.

[0029] Wherein, 1, screw plug; 2, first O-ring; 3, valve sleeve; 4, second O-ring; 5, spring seat; 6, conical valve core; 7, coil; 8, second spring; 9, ejector rod; 10, moving iron; 11, third spring; 12, gasket; 13, first spring; 14, valve body; 15, valve cavity; 16, pressure relief port; 17, first oil passage; 18, second oil passage. Detailed implementation manners

[0030] Embodiment 1

[0031] In a typical embodiment of the present invention, as Figure 1 - Figure 2 shown, a switching solenoid valve is provided.

[0032] In traditional solenoid valves, the magnetic hysteresis of the electromagnet will affect the reset action of the valve core, resulting in an extended reset time and affecting the reliability of the solenoid valve. Based on this, this embodiment provides a switching solenoid valve. The setting of the first spring 13 enables the conical valve core 6 to be quickly pushed to reset by the elastic force of the spring when the electromagnetic drive mechanism loses power, reducing the dependence on the electromagnet and effectively avoiding the problem of untimely reset caused by magnetic hysteresis. The first spring 13 keeps the conical valve core 6 in a normally closed state and can quickly reset to cut off the oil circuit when the electromagnetic drive mechanism loses power, blocking the return flow of the second oil passage through the valve cavity 15 to the first oil passage and improving the reliability of oil circuit cut-off.

[0033] As Figure 1 shown, the switching solenoid valve mainly includes a valve body 14, a conical valve core 6 and a valve sleeve 3. Among them, the valve body 14 is the basic component of the entire solenoid valve, on which a first oil passage and a second oil passage are provided. These two oil circuits are interconnected through the valve cavity 15 to provide a channel for the flow of hydraulic oil and realize the functions of the hydraulic system. The conical valve core 6 is slidably installed in the valve cavity 15, and a pressure relief cavity and a pressure relief port 16 are provided inside. The pressure relief cavity is connected to the second oil passage and is connected to the first oil passage through the pressure relief port 16.

[0034] The conical valve core 6 changes its relative position with the valve body 14 by sliding within the valve cavity 15, thereby achieving the cut-off or connection of the first oil passage and the valve cavity 15 and controlling the flow of hydraulic oil. At the same time, the internal pressure relief cavity and the pressure relief port 16 can be used to adjust the pressure difference at both ends of the conical valve core 6 to assist its operation. The valve sleeve 3 is installed on the valve body 14, and a spring seat 5 is provided at one end facing the valve body 14, providing an installation space and support for components such as the electromagnetic drive mechanism, and cooperating with the valve body 14 to ensure the structural stability of the entire solenoid valve.

[0035] In this embodiment, the spring seat 5 is provided at one end of the valve sleeve 3 facing the valve body 14, and the first spring 13 is installed between the spring seat 5 and the conical valve core 6. The elastic force of the first spring 13 acts on the conical valve core 6 to resist the oil pressure from the first oil passage, keeping the conical valve core 6 in a normally closed state. When the electromagnetic drive mechanism loses power, the first spring 13 can push the conical valve core 6 to quickly reset.

[0036] The push rod 9 is in sliding fit with the spring seat 5, with one end connected to the electromagnetic drive mechanism and the other end as a sealing end extending into the pressure relief cavity. It moves back and forth under the drive of the electromagnetic drive mechanism, and its sealing end is used to block or open the pressure relief port 16, thereby controlling the connection state between the pressure relief cavity and the first oil passage, and further affecting the operation of the conical valve core 6.

[0037] The electromagnetic drive mechanism can drive the push rod 9 to move. Common electromagnetic drive mechanisms include components such as the moving iron 10 and the coil 7. By driving the push rod 9 with electromagnetic force, the control of the pressure relief port 16 is achieved, serving as the power for the solenoid valve to realize the switching function.

[0038] Due to the action of the first spring 13, the conical valve core 6 can quickly reset when the electromagnetic drive mechanism loses power, achieving a rapid cut-off of the oil circuit, enhancing the reset and commutation function of the solenoid valve. When the solenoid valve frequently switches its working state, it can respond more timely and accurately, improving the working efficiency of the hydraulic system. It reduces the problem of untimely reset caused by the magnetic hysteresis of the electromagnet and ensures the reliability of the oil circuit cut-off, thereby improving the reliability of the entire solenoid valve and meeting the requirements of hydraulic systems with high safety and stability requirements.

[0039] As Figure 1 shown, the sealing end blocks the pressure relief port 16 to form a conical surface seal. Compared with other forms such as plane seals, the conical surface seal has better sealing performance. In the hydraulic system, it can more effectively prevent oil leakage, ensuring good sealing between the pressure relief cavity and the first oil passage when the sealing end of the push rod 9 blocks the pressure relief port 16, so as to ensure that the conical valve core 6 can accurately adjust the internal pressure as needed, and then precisely control the connection and cut-off of the first oil passage and the valve cavity 15.

[0040] In the telescopic direction of the first spring 13, one end abuts against the spring seat 5, and the other end abuts against the conical valve core 6. Moreover, one end of the first spring 13 that abuts against the conical valve core 6 extends into the pressure relief cavity of the conical valve core 6, and the entire first spring 13 is sleeved outside the ejector rod 9. This enables the first spring 13 to stably provide elastic force for the conical valve core 6, resist the oil pressure from the first oil passage, and ensure that the conical valve core 6 is in a normally closed state. The spring is sleeved outside the ejector rod 9, which not only plays a certain role in protecting and guiding the ejector rod 9, but also enables the elastic force of the spring to act more evenly on the conical valve core 6, avoiding tilting or jamming of the conical valve core 6 during movement, and improving the stability and reliability of the movement of the conical valve core 6.

[0041] The spring seat 5 is provided with a sliding hole, and the ejector rod 9 is slidably matched with the sliding hole, and the matching position is between the two ends of the ejector rod 9. The sliding hole provides precise sliding guidance for the ejector rod 9, ensuring that the ejector rod 9 can move smoothly along a straight line under the drive of the electromagnetic drive mechanism. The matching position is between the two ends of the ejector rod 9, which helps to disperse the force received by the ejector rod 9 during movement, reduce the possibility of the ejector rod 9 bending or wearing due to uneven force, extend the service life of the ejector rod 9, and at the same time improve the accuracy of the ejector rod 9 in blocking and opening the pressure relief port 16.

[0042] As Figure 1 and Figure 2 shown, the electromagnetic drive mechanism includes an armature 10 and a coil 7. An installation hole is provided in the valve sleeve 3, the armature 10 is slidably matched in the installation hole, one end of the ejector rod 9 is connected to the armature 10, and the other end extends outside the installation hole. A second spring 8 is installed between the armature 10 and the bottom of the installation hole. The coil 7 and the second spring 8 act together on the armature 10 to drive it to slide along the installation hole; one end of the installation hole is open for the ejector rod 9 to protrude, and the other end is a sealed end as the bottom of the hole, and the spring seat 5 is fitted at the opening of the installation hole.

[0043] When the coil 7 is energized, a magnetic field is generated to attract the armature 10 to move towards the sealed end against the elastic force of the second spring 8, driving the ejector rod 9 to open the pressure relief port 16; when the coil 7 is de-energized, the second spring 8 rebounds to push the armature 10 to reset, driving the ejector rod 9 to block the pressure relief port 16. The method of jointly driving the armature 10 by the coil 7 and the second spring 8 can effectively overcome the influence of the magnetic hysteresis of the electromagnet, make the movement of the armature 10 faster and more accurate, and thus improve the response speed and reliability of the solenoid valve. The spring seat 5 is fitted at the opening of the installation hole, playing a role of fixing and supporting, and ensuring the stability of the entire electromagnetic drive mechanism.

[0044] As Figure 1As shown in the figure, the coil 7 is sleeved outside the valve sleeve 3. One end of the coil 7 abuts against the shoulder of the valve sleeve 3, and the other end abuts against the plug 1 that cooperates with the valve sleeve 3 to restrict the position of the coil 7. A first O-ring 2 is also installed at the mating position of the plug 1 and the valve sleeve 3 for sealing. There is an interference fit between the spring seat 5 and the mounting hole to keep the position of the spring seat 5 stable. One end of the valve sleeve 3 is connected to the valve body 14, and a second O-ring 4 is installed at the connection position with the valve body 14 for sealing.

[0045] The push rod 9 is divided into two sections along the axial direction. The first section is located inside the armature 10. One end of the second section cooperates with the armature 10 and moves with the armature 10. The other end extends into the pressure relief cavity and cooperates with the pressure relief port 16. A third spring 11 is provided between the first section and the second section as a buffer structure. A gasket 12 is installed at the position where the second section cooperates with the armature 10 to restrict the position of the end of the second section so that the second section can move with the armature 10.

[0046] The armature 10 is a proportional adjustment iron core, and the coil 7 is fixed to the valve sleeve 3. The proportional adjustment iron core can accurately control its own displacement according to the magnitude of the current input to the coil 7. By changing the current input to the coil 7, the displacement of the armature 10 can be continuously adjusted, and then the position of the push rod 9 and the opening degree of the pressure relief port 16 can be accurately controlled. The proportional adjustment function enables the solenoid valve to finely adjust the flow rate and pressure between the first oil passage and the second oil passage according to the actual working requirements, improving the control accuracy and flexibility of the solenoid valve and meeting the working requirements of more complex hydraulic systems. The armature 10 of the proportional adjustment iron core solves the problem that traditional solenoid valves cannot accurately control the flow rate and pressure, and realizes the fine adjustment of the hydraulic system.

[0047] As Figure 1 and Figure 2 shown, specifically, the first oil passage and the second oil passage are connected through the valve cavity 15. The tapered valve core 6 is slidably installed in the valve cavity 15 to adjust the opening degree of the connection position between the first oil passage and the second oil passage by sliding to change the relative position with the valve body 14. A pressure relief cavity is provided inside the tapered valve core 6, and the pressure relief cavity is connected to the first oil passage through the pressure relief port 16; the valve sleeve 3 is installed on the valve body 14, a coil 7 is sleeved outside the valve sleeve 3, an installation hole with an opening facing the valve body 14 is provided inside the valve sleeve 3, the other end of the installation hole is a sealed end, an armature 10 is slidably installed in the installation hole, a second spring 8 is provided between the armature 10 and the bottom of the installation hole, a spring seat 5 is installed at the open end of the installation hole, one end of the push rod 9 cooperates with the armature 10, and the other end passes through the spring seat 5 and extends outside the installation hole and into the pressure relief cavity. The end of the push rod 9 extending into the pressure relief cavity is a sealed end, and the sealed end blocks and opens the pressure relief port 16 by driving the push rod 9 to move back and forth by the armature 10; a first spring 13 abuts between the tapered valve core 6 and the spring seat 5, and the elastic force of the first spring 13 acts on the tapered valve core 6 to resist the oil pressure from the first oil passage.

[0048] When the switch solenoid valve is energized, the coil 7 outside the valve sleeve 3 is energized, and the moving iron 10 serving as the electromagnet core is attracted under the action of the magnetic field, causing the moving iron 10 to drive the ejector rod 9 to move towards the sealing end of the mounting hole, that is, as shown in Figure 1 shown, moving to the left, the sealing end of the ejector rod 9 releases the blockage of the pressure relief port 16 under the drive of the moving iron 10, opening the pressure relief port 16, and the internal pressure relief cavity of the conical valve core 6 is communicated with the first oil passage on the right side of the conical valve core 6, realizing the pressure relief of the internal pressure relief cavity of the conical valve core 6. At this time, the hydraulic oil in the first oil passage only needs to overcome the elastic force of the first spring 13 to push the conical valve core 6 to move, realizing the communication of the first oil passage with the second oil passage through the valve cavity 15, establishing the flow of hydraulic oil, and performing the action.

[0049] When the switch solenoid valve is de-energized, the coil 7 outside the valve sleeve 3 loses power. After the moving iron 10 serving as the electromagnet core loses the magnetic field effect, the second spring 8 rebounds to push the moving iron 10 to drive the ejector rod 9 to move towards the pressure relief port 16, that is, as shown in Figure 1 shown, moving to the right, the sealing end of the ejector rod 9 approaches the pressure relief port 16 and blocks the pressure relief port 16 under the drive of the moving iron 10. The internal pressure relief cavity of the conical valve core 6 is cut off from the first oil passage on the right side of the conical valve core 6, and the pressure oil in the pressure relief cavity of the conical valve core 6 cannot flow out. The elastic force of the first spring 13 acts on the conical valve core 6, causing the conical valve core 6 to block the position where the first oil passage communicates with the valve cavity 15, cutting off the communication between the first oil passage and the second oil passage, and stopping the execution of the action; at this time, the hydraulic oil in the first oil passage not only needs to overcome the elastic force of the first spring 13, but also needs to overcome the oil pressure in the pressure relief cavity of the conical valve core 6 to make the conical valve core 6 move to connect the first oil passage with the second oil passage through the valve cavity 15.

[0050] Embodiment 2

[0051] In another typical embodiment of the present invention, as shown in Figure 1 - Figure 2 shown, a working method of a switch solenoid valve is given, using the switch solenoid valve as in Embodiment 1.

[0052] A working method of a switch solenoid valve includes:

[0053] After the electromagnetic drive mechanism is energized, it drives the ejector rod 9 to release the blockage of the pressure relief port 16, and the pressure relief cavity is communicated with the first oil passage to relieve pressure;

[0054] The hydraulic oil in the first oil passage overcomes the elastic force of the first spring 13 to push the conical valve core 6 to move, realizing the communication of the first oil passage with the second oil passage through the valve cavity 15, establishing the flow of hydraulic oil, and performing the action;

[0055] After the electromagnetic drive mechanism loses power, the first spring 13 drives the conical valve core 6 to quickly reset to cut off the first oil passage and the valve cavity 15, stopping the execution of the action; the electromagnetic drive mechanism after losing power drives the ejector rod 9 to block the pressure relief port 16, cutting off the communication between the pressure relief cavity and the first oil passage, and waiting for the electromagnetic drive mechanism to be energized.

[0056] After the conical valve core 6 cuts off the connection between the first oil passage and the valve cavity 15, it blocks the reflux of the second oil passage through the valve cavity 15 to the first oil passage. During the reset process of the conical valve core 6, its sealing structure closely cooperates with the valve body 14 to form an effective seal, preventing the reverse flow of oil. In the hydraulic lifting system of heavy-duty working scenarios such as forklifts, if the oil flows back, it may cause the heavy object to suddenly drop, triggering a safety accident. This working method ensures the safety and stability of the system under power-off or specific working conditions through the sealing effect of the conical valve core 6.

[0057] Specifically, when the electromagnetic drive mechanism is powered on, the moving iron 10 moves towards the plugging end of the mounting hole under the action of the electromagnetic force, overcoming the elastic force of the second spring 8. Since one end of the push rod 9 is connected to the moving iron 10 and moves together, the sealing end of the push rod 9 releases the plugging of the pressure relief port 16. At this time, the pressure relief cavity is connected to the first oil passage. Since the first oil passage serves as the driving oil passage and has a higher pressure than the pressure relief cavity, the oil flows into the pressure relief cavity to achieve pressure relief. Utilizing the principle of pressure difference, it quickly changes the pressure state at both ends of the conical valve core 6, creating conditions for the subsequent movement of the conical valve core 6.

[0058] As the pressure in the pressure relief cavity decreases, the hydraulic oil in the first oil passage overcomes the elastic force of the first spring 13 under the action of the pressure and pushes the conical valve core 6 to slide. The sliding of the conical valve core 6 changes its relative position with the valve body 14, enabling the first oil passage to be connected to the second oil passage through the valve cavity 15, establishing a circulation path for the hydraulic oil. The hydraulic oil can circulate in the system to drive various actuators, thereby performing corresponding actions.

[0059] After the electromagnetic drive mechanism loses power, the moving iron 10 resets under the action of the elastic force of the second spring 8, driving the push rod 9 to move towards the pressure relief port 16. At the same time, the first spring 13 drives the conical valve core 6 to quickly reset, and the conical valve core 6 quickly moves to the position where it cuts off the connection between the first oil passage 17 and the valve cavity 15. The first spring 13 plays a reset role to ensure that the conical valve core 6 can respond to the power-off state of the electromagnetic drive mechanism in a timely and accurate manner and quickly cut off the oil passage.

[0060] The push rod 9 re-establishes the plugging of the pressure relief port 16 under the drive of the moving iron 10, cutting off the connection between the pressure relief cavity and the first oil passage. At this time, the solenoid valve is in the closed state, waiting for the electromagnetic drive mechanism to be powered on next time. This enables the solenoid valve to orderly control the on-off of the oil passage when powered on and off, ensuring the normal operation of the system.

[0061] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A switch solenoid valve, characterized in that: include: A valve body, provided with a first oil passage and a second oil passage communicated through the valve cavity; The cone valve core is slidably mounted in the valve cavity, and the first oil passage and the valve cavity are cut off or connected by sliding. A pressure relief chamber and a pressure relief port connected to the second oil passage are provided inside the cone valve core, and the pressure relief chamber is connected to the first oil passage through the pressure relief port. The valve sleeve is installed on the valve body. A spring seat is provided at one end of the valve sleeve facing the valve body. A first spring is installed between the spring seat and the cone valve core. The first spring resists the oil pressure from the first oil channel borne by the cone valve core to keep the cone valve core in a normally closed state. The spring seat is slidably matched with a push rod. One end of the push rod is connected to the electromagnetic drive mechanism, and the other end serves as a sealing end and extends into the pressure relief chamber. The sealing end seals and opens the pressure relief port by utilizing the electromagnetic drive mechanism to drive the push rod to move.

2. The switch solenoid valve according to claim 1, characterized in that: The sealing end blocks the pressure relief port to form a conical seal.

3. The switch solenoid valve according to claim 1, characterized in that: Along the expansion and contraction direction of the first spring, one end of the first spring abuts against the spring seat, and the other end abuts against the cone valve core.

4. The switch solenoid valve according to claim 3, characterized in that: One end of the first spring is inserted into the pressure relief cavity of the cone valve core, and the first spring is sleeved outside the push rod.

5. The switch solenoid valve according to claim 3 or 4, characterized in that: The spring seat is provided with a sliding hole, the push rod is slidably matched with the sliding hole, and the matching position is located between the two ends of the push rod.

6. The switch solenoid valve according to claim 1, characterized in that: The electromagnetic drive mechanism includes a moving iron and a coil. A mounting hole is provided in the valve sleeve. The moving iron slides in the mounting hole. One end of the push rod is connected to the moving iron, and the other end extends outside the mounting hole. A second spring is installed between the moving iron and the bottom of the mounting hole. The coil and the second spring act together on the outside of the moving iron to drive the moving iron to slide along the mounting hole.

7. The switch solenoid valve according to claim 6, characterized in that: One end of the mounting hole is an opening for the push rod to protrude, and the other end is a blocking end serving as the bottom of the hole, and the spring seat is matched at the opening of the mounting hole.

8. The switch solenoid valve according to claim 6 or 7, characterized in that: The moving iron is a proportional adjustment iron core, and the coil is fixed to the valve sleeve.

9. A method for operating a switch solenoid valve, using the switch solenoid valve as claimed in any one of claims 1 to 8, characterized in that: include: After the electromagnetic drive mechanism is energized, it drives the ejector rod to release the blockage of the pressure relief port, and the pressure relief chamber is connected to the first oil passage to relieve pressure; The hydraulic oil in the first oil passage overcomes the elastic force of the first spring to push the cone valve core to move, so that the first oil passage is connected to the second oil passage through the valve cavity, the flow of hydraulic oil is established, and the action is performed; After the electromagnetic drive mechanism loses power, the first spring drives the cone valve core to quickly reset so that the first oil channel and the valve cavity are cut off and the execution action stops; After power failure, the electromagnetic drive mechanism drives the ejector rod to seal the pressure relief port, cuts off the connection between the pressure relief chamber and the first oil channel, and waits for the electromagnetic drive mechanism to be powered.

10. The operating method of the switch solenoid valve according to claim 9, characterized in that: After the cone valve core cuts off the connection between the first oil passage and the valve chamber, the backflow of the second oil passage to the first oil passage through the valve chamber is cut off.

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