Quick on-off electromagnetic valve capable of precisely controlling displacement

Abstract

The utility model provides a quick switch solenoid valve capable of precisely controlling displacement, which comprises a plunger tube assembly, a movable valve core, a first coil, a second coil, a controller and a displacement sensor, and the movable valve core is slidably mounted in the plunger tube assembly; the first coil and the second coil are arranged at the two ends of the magnetism isolating pipe assembly in a sleeving mode correspondingly and used for generating electromagnetic force to drive the movable valve element to move in the magnetism isolating pipe assembly. The controller is electrically connected with the first coil and the second coil and used for controlling power-on and power-off of the first coil and the second coil and the magnitude of current. The displacement sensor is mounted at one end of the plunger tube assembly, electrically connected with the controller and used for detecting the position of the movable valve element and feeding back the position to the controller; one end of the movable valve element penetrates through the displacement sensor and is arranged outside the magnetism isolating pipe assembly. The high-speed switch electromagnetic valve capable of precisely controlling the displacement has the advantages of high-speed switch and precise displacement control.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valves, and in particular to a fast-switching solenoid valve for precise displacement control. Background Technology

[0002] With the continuous improvement of industrial automation, higher requirements are being placed on rapid response and precise control. Currently, fast-switching solenoid valves all use electromagnetic drive and mechanical spring reset to achieve switching action; precision displacement is mainly achieved by controlling the left and right movement of the cylinder piston rod through the air inlet and outlet of the pneumatic solenoid valve, and some manufacturers even use servo motors to drive connecting rods for displacement control.

[0003] Modern high-end equipment is becoming increasingly compact, demanding extremely high control precision. Existing fast-switching solenoid valves and cylinders cannot achieve this precise control, and these two functions are not integrated, requiring separate components. Currently, the response time of fast-switching solenoid valves has reached nearly 500Hz, which is the limit of mechanical motion, and there are no better solutions for higher frequency requirements. Meanwhile, current methods for precise displacement control are limited to pneumatic solenoid valves controlling cylinder pistons to achieve telescopic movement. This method suffers from low control precision and slow response time, causing significant challenges to the precision control of many advanced pieces of equipment. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a fast-switching solenoid valve for precise displacement control, which has the advantages of fast switching and precise displacement control. It breaks away from the existing structure of fast-switching valves that rely on spring reset, and adopts dual electric control to achieve high-frequency control. At the same time, it adopts a dual-coil PID control method to perform precise displacement control of the moving valve core.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a fast-switching solenoid valve for precise displacement control, comprising:

[0008] Magnetic shielding tube assembly;

[0009] The movable valve core is slidably installed inside the magnetic shielding tube assembly;

[0010] The first coil and the second coil are respectively mounted at both ends of the magnetic shielding tube assembly to generate electromagnetic force to drive the movable valve core to move within the magnetic shielding tube assembly;

[0011] The controller is electrically connected to the first coil and the second coil respectively, and is used to control the on and off of the first coil and the second coil and the magnitude of the current;

[0012] A displacement sensor is installed at one end of the magnetic shielding tube assembly and electrically connected to the controller, used to detect the position of the movable valve core and provide feedback to the controller; one end of the movable valve core passes through the displacement sensor and is placed outside the magnetic shielding tube assembly.

[0013] In some embodiments, the controller includes a first current sensor and a second current sensor. The first current sensor is electrically connected to the first coil and is used to detect the current magnitude of the first coil in real time and feed it back to the controller. The second current sensor is electrically connected to the second coil and is used to detect the current magnitude of the second coil in real time and feed it back to the controller.

[0014] In some embodiments, the controller has a fast switching mode and a precision displacement control mode. In the fast switching mode, the controller controls the first coil and the second coil to be energized and de-energized rapidly and alternately, thereby causing the movable valve core to reciprocate rapidly. The displacement sensor detects whether the movable valve core has moved into position each time. In the precision displacement control mode, under the movement accuracy requirements of the displacement sensor, the first current sensor detects the current magnitude of the first coil and the second coil in real time and feeds it back to the controller. The controller adjusts the current magnitude of the first coil and the second coil in real time, thereby causing the movable valve core to perform precise displacement.

[0015] In some embodiments, a magnetic field shielding block is fitted in the middle of the magnetic shielding tube assembly. The magnetic field shielding block is located between the first coil and the second coil, and the magnetic field shielding block is used to prevent the magnetic fields generated by the first coil and the second coil from interfering with each other.

[0016] In some embodiments, the first coil and the second coil have the same structure and the coils are wound in opposite directions; when the first coil is energized, the movable valve core moves upward; when the second coil is energized, the movable valve core moves downward; the controller is a PID controller.

[0017] In some embodiments, the magnetic shielding tube assembly includes a tubular magnetic shielding tube body, an upper fixed iron core fixed to the upper end of the magnetic shielding tube body, and a lower fixed iron core fixed to the lower end of the magnetic shielding tube body. The first coil and the second coil are both mounted on the magnetic shielding tube body. The movable valve core can slide between the upper fixed iron core and the lower fixed iron core. A first central hole is provided inside the upper fixed iron core, and the displacement sensor is installed in the first central hole.

[0018] In some embodiments, the movable valve core includes a cylindrical body and a pin located at the upper end of the cylindrical body, the outer diameter of the pin being smaller than the outer diameter of the cylindrical body; the displacement sensor has a through second central hole, and the pin passes through the second central hole.

[0019] In some embodiments, the upper end face of the cylindrical body is opposite to the upper suction surface of the upper fixed iron core, the lower end face of the cylindrical body is opposite to the lower suction surface of the lower fixed iron core, the area of ​​the upper end face of the cylindrical body is smaller than the area of ​​its lower end face, and the area of ​​the upper suction surface is smaller than the area of ​​the lower suction surface.

[0020] In some embodiments, the displacement sensor is equipped with an upper washer and an upper locking nut, the upper locking nut being used to lock the first coil; the lower fixed iron core is equipped with a lower washer and a lower locking nut, the lower locking nut being used to lock the second coil.

[0021] In some embodiments, both the upper fixed iron core and the lower fixed iron core are fixed to the magnetic shielding tube body by laser welding.

[0022] (III) Beneficial Effects

[0023] The present invention provides a fast-switching solenoid valve for precise displacement control, which has the following advantages compared with the prior art:

[0024] 1) It has a simple and compact structure, combining the advantages of fast switching and precise displacement; it directly converts electrical energy into mechanical energy, and under the action of the PID controller, it can not only achieve fast-response switching, but also achieve micron-level displacement, with high speed, high precision and good stability.

[0025] 2) The dual-electric control fast switching mode breaks away from the previous design where the moving valve core relied on spring reset. The structure that converts electrical energy into mechanical energy greatly improves the response speed of the moving valve core in the solenoid valve, and also overcomes the fatal defect of reduced spring reset speed caused by residual magnetic force due to material reasons.

[0026] 3) A dual-coil PID control method is adopted. When the current of the first coil is greater than the current of the second coil, the movable valve core will move upward; when the current of the second coil is greater than the current of the first coil, the movable valve core will move downward. When the displacement sensor intervenes, it will continuously feed back the position of the movable valve core to the controller. By cooperating with the current sensor and the controller, the current of the two coils is adjusted in real time, thereby achieving precise displacement of the movable valve core. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a fast-switching solenoid valve for precise displacement control according to this utility model;

[0029] Figure 2 This is a simplified schematic diagram of the structure of two current sensors for a fast-switching solenoid valve for precise displacement control according to this utility model.

[0030] Figure 3 This is a schematic diagram of the structure of a fast-switching solenoid valve for precise displacement control of the present invention, which generates a magnetic field interference zone when a magnetic field shielding block is not installed.

[0031] Figure 4 This is a schematic diagram of the magnetic field distribution after installing a magnetic field shielding block on a fast-switching solenoid valve for precise displacement control according to this utility model.

[0032] Figure 5 This is a schematic diagram of the connection between the first coil and the magnetic shielding tube assembly of a fast-switching solenoid valve for precise displacement control according to this utility model.

[0033] Figure 6 This is a schematic diagram of the connection between the second coil and the magnetic shielding tube assembly of a fast-switching solenoid valve for precise displacement control according to this utility model.

[0034] Figure 7 This is a schematic diagram showing the connection between the first coil, the second coil, and the magnetic shielding tube assembly of a fast-switching solenoid valve for precise displacement control according to this utility model.

[0035] Figure 8 This is a schematic diagram of the magnetic tube assembly of a fast-switching solenoid valve for precise displacement control according to this utility model.

[0036] Figure 9 This is a schematic diagram of the structure of a fast-switching solenoid valve for precise displacement control, with the moving valve core in the middle position.

[0037] Figure 10 This is a schematic diagram of the structure of a fast-switching solenoid valve for precise displacement control according to the present invention, when the movable valve core moves upward;

[0038] Figure 11 This is a schematic diagram of the structure of a fast-switching solenoid valve for precise displacement control according to this utility model when the movable valve core moves downward;

[0039] Figure 12 This is a schematic diagram of the movable valve core of a fast-switching solenoid valve for precise displacement control according to this utility model.

[0040] Figure 13 This is a schematic diagram of the structure of an existing cylinder;

[0041] The component names corresponding to the various labels in the figure are as follows: 1. Magnetic shielding tube assembly; 101. Magnetic shielding tube body; 102. Upper fixed iron core; 103. Lower fixed iron core; 104. First center hole; 105. Upper suction surface; 106. Lower suction surface; 2. Movable valve core; 201. Cylindrical body; 202. Insert post; 3. First coil; 4. Second coil; 5. Controller; 501. First current sensor; 502. Second current sensor; 6. Displacement sensor; 601. Second center hole; 7. Magnetic field shielding block; 8. Upper washer; 9. Upper locking nut; 10. Lower washer; 11. Lower locking nut. Detailed Implementation

[0042] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0043] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0045] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0047] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0048] See Figures 1 to 12 This utility model provides a fast-switching solenoid valve for precise displacement control, including a magnetic shielding tube assembly 1, a movable valve core 2, a first coil 3, a second coil 4, a controller 5, and a displacement sensor 6.

[0049] See Figure 1 The movable valve core 2 is slidably mounted inside the magnetic shielding tube assembly 1, and can slide along the axial direction of the magnetic shielding tube assembly 1. A first coil 3 and a second coil 4 are respectively fitted at both ends of the magnetic shielding tube assembly 1, generating electromagnetic force to drive the movable valve core 2 within the assembly 1; the driving forces of the first coil 3 and the second coil 4 on the movable valve core 2 are opposite. A controller 5 is electrically connected to both the first coil 3 and the second coil 4, controlling their on / off state and current magnitude. The controller 5 controls the on / off state of the two coils to achieve rapid switching, and controls the current magnitude to achieve precise displacement control. A displacement sensor 6 is mounted at one end of the magnetic shielding tube assembly 1 and electrically connected to the controller 5, detecting the position of the movable valve core 2 and feeding back the position to the controller 5; one end of the movable valve core 2 passes through the displacement sensor 6 and is located outside the magnetic shielding tube assembly 1. This solenoid valve has a simple and compact structure, combining rapid switching and precise displacement control functions, offering powerful functionality and good performance.

[0050] In some embodiments, such as Figure 2 As shown, the controller 5 includes a first current sensor 501 and a second current sensor 502. The first current sensor 501 is electrically connected to the first coil 3 and is used to detect the current magnitude of the first coil 3 in real time and feed it back to the controller 5. The second current sensor 502 is electrically connected to the second coil 4 and is used to detect the current magnitude of the second coil 4 in real time and feed it back to the controller 5. By using two current sensors to detect the current magnitude of the two coils in real time, and then promptly feeding the detected current magnitude back to the controller 5, the controller 5 can accurately adjust the current magnitude of the two coils.

[0051] In some embodiments, such as Figure 2 As shown, controller 5 has two control modes: fast switching mode and precision displacement control mode. When controller 5 selects fast switching mode, the dual-electrode energizing time (0.1ms to 50ms) can be set in controller 5. When controller 5 presses the start button, controller 5 controls the first coil 3 and the second coil 4 to quickly and alternately switch on and off, thereby causing the movable valve core 2 to reciprocate rapidly. In this mode, displacement sensor 6 is used to detect whether the movable valve core 2 has moved to the correct position each time, so that controller 5 can control the switching on and off of the two coils. When controller 5 selects precision displacement control mode, under the movement accuracy requirements of displacement sensor 6, the first current sensor 501 detects the current magnitude of the first coil 3 and the second coil 4 in real time and feeds it back to controller 5. Controller 5 adjusts the current magnitude of the first coil 3 and the second coil 4 in real time, thereby causing the movable valve core 2 to move precisely to achieve the optimal extension point.

[0052] This structure allows for switching between the two functions mentioned above. In the fast-switching mode (high frequency), when the first coil 3 is energized, the magnetic field of the first coil 3 pulls the movable valve core 2 upward, and a feedback signal is received from the displacement sensor 6, indicating that the movable valve core 2 has completed its movement into position. When the first coil 3 is de-energized and the electromagnetic field disappears, the second coil 4 is energized, and the magnetic field of the second coil 4 pulls the movable valve core 2 downward, and a feedback signal is received from the displacement sensor 6, indicating that the movable valve core 2 has completed its separation into position. The above control mode is a dual-electro-control method, that is, when the first coil 3 is energized, the second coil 4 is de-energized, and when the second coil 4 is energized, the first coil 3 is de-energized. The faster the electrical signal switching, the faster the movable valve core 2 moves. This fast-switching structure breaks away from the previous design where the movable valve core relied on a spring for reset. The structure that converts electrical energy into mechanical energy greatly improves the response speed of the movable valve core in the solenoid valve, and also overcomes the fatal defect of reduced spring reset speed caused by residual magnetic force due to material reasons.

[0053] In precision displacement control mode, both coils are energized simultaneously. Under the influence of their respective magnetic fields, the direction of movement of the movable valve core is unclear, much like a tug-of-war. However, under the requirements of displacement sensor 6 (how much distance to move), and through the cooperation of the controller and two current sensors, when the movable valve core needs to move upward, the controller increases the current value of the first coil 3 while decreasing the current value of the second coil 4, causing the movable valve core 2 to move upward; when the movable valve core needs to move downward, the controller decreases the current value of the first coil 3 while increasing the current value of the second coil 4, causing the movable valve core 2 to move downward. The more precise the increase or decrease of the current in the two coils, the more precise the displacement of the movable valve core.

[0054] In some embodiments, such as Figure 3and Figure 4 As shown, a magnetic field shielding block 7 is fitted into the middle of the magnetic shielding tube assembly 1. The magnetic field shielding block 7 is located between the first coil 3 and the second coil 4. The magnetic field shielding block 7 is used to prevent the magnetic fields generated by the first coil 3 and the second coil 4 from interfering with each other. When the first coil 3 and the second coil 4 are energized simultaneously, both coils will generate their own magnetic lines of force, and a magnetic interference area will be generated at the intersection of the two coils (such as...). Figure 3 (As shown); This utility model has a magnetic field shielding block between the two coils so that the magnetic field is not affected when the two coils work at the same time, and each can independently exert its maximum magnetic force.

[0055] In some embodiments, such as Figures 5 to 7 As shown, to simplify the structure, the first coil 3 and the second coil 4 have the same structure, but the winding directions of the coils are opposite. When the first coil 3 is energized, the movable valve core 2 moves upward; when the second coil 4 is energized, the movable valve core 2 moves downward; the controller 5 is a PID controller.

[0056] like Figure 5 As shown, the first coil 3 is inserted into one end of the magnetic shielding tube assembly and fixed. When the first coil 3 is energized, it generates a magnetic field. Under the action of the magnetic field, the movable valve core 2 moves upward toward the fixed iron core 102 until it is attracted, completing one movement action. Figure 6 As shown, the second coil 4 is inserted into the other end of the magnetic shielding tube assembly and fixed. When the second coil 4 is energized, it generates a magnetic field. Under the action of the magnetic field, the movable valve core 2 moves downward toward the fixed iron core 103 until it is attracted, thus completing one movement action. The above actions are in a single-electric control form. Figure 7 As shown, when the first coil 3 and the second coil 4 are installed at both ends of the magnetic shielding tube assembly, in order to achieve the purpose of rapid movement of the movable valve core 2, the control method must be changed to dual electric control. At this time, the faster the dual electric control signal, the faster the movable valve core 2 moves, and the switching speed completely surpasses that of the high-frequency solenoid valve using the spring reset method.

[0057] In some embodiments, such as Figure 7 and Figure 8As shown, the magnetic shielding tube assembly 1 includes a tubular magnetic shielding tube body 101, an upper fixed iron core 102 fixed at the upper end of the magnetic shielding tube body 101, and a lower fixed iron core 103 fixed at the lower end of the magnetic shielding tube body 101. Both the upper fixed iron core 102 and the lower fixed iron core 103 are fixed inside the magnetic shielding tube body 101 by laser welding, which provides good sealing and fixing effects. The first coil 3 and the second coil 4 are both fitted onto the magnetic shielding tube body 101. The movable valve core 2 can slide between the upper fixed iron core 102 and the lower fixed iron core 103. A through-hole first central hole 104 is provided inside the upper fixed iron core 102, and the displacement sensor 6 is installed inside the first central hole 104. Using the magnetic shielding tube assembly 1 can create a magnetic circuit boundary point for the magnetic field, making the displacement direction of the movable valve core 2 more clearly defined.

[0058] See Figures 9 to 11 As shown, this utility model employs a dual-coil PID control method to solve the problem of precise displacement of the moving valve core. For example... Figure 9 As shown, when the same current flows through the first and second coils, their respective magnetic forces are equal, and the movable valve core 2 will remain in the middle position of the magnetic shielding tube assembly, in a state of force balance. Figure 10 As shown, when the current in the first coil is greater than the current in the second coil, the movable valve core 2 will move upward. Figure 11 As shown, when the current in the second coil is greater than the current in the first coil, the movable valve core 2 will move downward. When the displacement sensor 6 is engaged, it will feed back the position of the movable valve core to the controller in real time. By cooperating with the current sensor and the controller, the current magnitude of the two coils is adjusted in real time, thereby achieving precise displacement of the movable valve core.

[0059] In some embodiments, such as Figure 7 , Figure 8 and Figure 12As shown, the movable valve core 2 includes a cylindrical body 201 and an insert 202 located at the upper end of the cylindrical body 201. The cylindrical body 201 and the insert 202 are designed as a single unit, and the outer diameter of the insert 202 is smaller than the outer diameter of the cylindrical body 201. A through second central hole 601 is provided inside the displacement sensor 6, and the insert 202 passes through the second central hole 601. The upper end face of the cylindrical body 201 is opposite to the upper suction surface 105 of the upper fixed iron core 102, and the lower end face of the cylindrical body 201 is opposite to the lower suction surface 106 of the lower fixed iron core 103. The area of ​​the upper end face of the cylindrical body 201 is smaller than the area of ​​its lower end face, and the area of ​​the upper suction surface 105 is smaller than the area of ​​the lower suction surface 106. In the magnetic shielding tube assembly, the upper attraction surface 105 and the lower attraction surface 106 have different areas, resulting in different electromagnetic attraction forces under the same coil power. At the same time, the end face areas of the two ends of the cylindrical body 201 are different, resulting in different induced electromagnetic forces. This invention designs the upper attraction surface 105 and the lower attraction surface 106 to have different areas, so that the initial pulling force of the two coils is different, and the current of the two coils will not be in conflict.

[0060] In some embodiments, such as Figure 1 As shown, the displacement sensor 6 is equipped with an upper washer 8 and an upper locking nut 9, which is used to lock the first coil 3; the lower fixed iron core 103 is equipped with a lower washer 10 and a lower locking nut 11, which is used to lock the second coil 4.

[0061] like Figure 13 As shown, in existing cylinder technologies, to achieve precise control of cylinder movement, a rapid response test is required on the pneumatic two-position three-way solenoid valve to accurately control the thrust of gas entering the cylinder, thereby extending or retracting the cylinder piston rod. Comparison revealed that existing cylinders have low control precision, unstable displacement, and inconsistent speeds. This invention, however, directly converts electrical energy into mechanical energy. Under the action of a PID controller, it not only achieves rapid response switching but also micron-level displacement, resulting in high speed, high precision, and excellent stability.

[0062] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0063] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rapid-switching solenoid valve for precise displacement control, characterized in that, include: Magnetic shielding tube assembly (1); The movable valve core (2) is slidably installed inside the magnetic shielding tube assembly (1); The first coil (3) and the second coil (4) are respectively mounted on both ends of the magnetic shielding tube assembly (1) to generate electromagnetic force to drive the movable valve core (2) to move within the magnetic shielding tube assembly (1); the first coil (3) and the second coil (4) have the same structure and the coils are wound in opposite directions; a magnetic field shielding block (7) is installed between the first coil (3) and the second coil (4) to prevent the magnetic fields generated by the first coil (3) and the second coil (4) from interfering with each other; The controller (5) is electrically connected to the first coil (3) and the second coil (4) respectively, and is used to control the on and off of the first coil (3) and the second coil (4) and the magnitude of the current; A displacement sensor (6) is installed at one end of the magnetic shielding tube assembly (1) and electrically connected to the controller (5) for detecting the position of the movable valve core (2) and feeding back to the controller (5); one end of the movable valve core (2) passes through the displacement sensor (6) and is placed outside the magnetic shielding tube assembly (1).

2. The rapid-switching solenoid valve for precise displacement control as described in claim 1, characterized in that: The controller (5) includes a first current sensor (501) and a second current sensor (502). The first current sensor (501) is electrically connected to the first coil (3) and is used to detect the current magnitude of the first coil (3) in real time and feed it back to the controller (5). The second current sensor (502) is electrically connected to the second coil (4) and is used to detect the current magnitude of the second coil (4) in real time and feed it back to the controller (5).

3. The rapid-switching solenoid valve for precise displacement control as described in claim 2, characterized in that: The controller (5) has a fast switching mode and a precision displacement control mode. When in the fast switching mode, the controller (5) controls the first coil (3) and the second coil (4) to switch on and off rapidly, thereby causing the movable valve core (2) to reciprocate rapidly. The displacement sensor (6) detects whether the movable valve core (2) moves into place each time. When in the precision displacement control mode, under the movement accuracy requirement of the displacement sensor (6), the first current sensor (501) and the first current sensor (501) detect the current magnitude of the first coil (3) and the second coil (4) in real time and feed it back to the controller (5). The controller (5) adjusts the current magnitude of the first coil (3) and the second coil (4) in real time, thereby causing the movable valve core (2) to move precisely.

4. The rapid-switching solenoid valve for precise displacement control as described in claim 1, characterized in that: When the first coil (3) is energized, the movable valve core (2) moves upward; when the second coil (4) is energized, the movable valve core (2) moves downward; the controller (5) is a PID controller.

5. The rapid-switching solenoid valve for precise displacement control as described in claim 1, characterized in that: The magnetic shielding tube assembly (1) includes a tubular magnetic shielding tube body (101), an upper fixed iron core (102) fixed at the upper end of the magnetic shielding tube body (101), and a lower fixed iron core (103) fixed at the lower end of the magnetic shielding tube body (101). The first coil (3) and the second coil (4) are both mounted on the magnetic shielding tube body (101). The movable valve core (2) can slide between the upper fixed iron core (102) and the lower fixed iron core (103). A through first central hole (104) is provided in the upper fixed iron core (102), and the displacement sensor (6) is installed in the first central hole (104).

6. The rapid-switching solenoid valve for precise displacement control as described in claim 5, characterized in that: The movable valve core (2) includes a cylindrical body (201) and a plug (202) located at the upper end of the cylindrical body (201). The outer diameter of the plug (202) is smaller than the outer diameter of the cylindrical body (201). The displacement sensor (6) is provided with a through second central hole (601), and the plug (202) passes through the second central hole (601).

7. The rapid-switching solenoid valve for precise displacement control as described in claim 6, characterized in that: The upper end face of the cylindrical body (201) is opposite to the upper suction surface (105) of the upper fixed iron core (102), and the lower end face of the cylindrical body (201) is opposite to the lower suction surface (106) of the lower fixed iron core (103). The area of ​​the upper end face of the cylindrical body (201) is smaller than the area of ​​its lower end face, and the area of ​​the upper suction surface (105) is smaller than the area of ​​the lower suction surface (106).

8. The rapid-switching solenoid valve for precise displacement control as described in claim 5, characterized in that: The displacement sensor (6) is equipped with an upper washer (8) and an upper locking nut (9), which is used to lock the first coil (3); the lower fixed iron core (103) is equipped with a lower washer (10) and a lower locking nut (11), which is used to lock the second coil (4).

9. The rapid-switching solenoid valve for precise displacement control as described in claim 5, characterized in that: Both the upper fixed iron core (102) and the lower fixed iron core (103) are fixed inside the magnetic shielding tube body (101) by laser welding.

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