High-speed switch and precision control displacement electromagnetic valve

Abstract

The invention provides a high-speed switch and precise control displacement electromagnetic valve which comprises a plunger tube assembly, a movable valve element, a first coil, a second coil, a controller and a displacement sensor, and the movable valve element is installed in the plunger tube assembly in a sliding mode; 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 switching and precise displacement control electromagnetic valve has the advantages of high-speed switching and precise displacement control.

Description

Technical Field

[0001] The present invention relates to the field of solenoid valves, and particularly to a high-speed switch and precision control displacement solenoid valve. Background Art

[0002] With the continuous improvement of industrial automation, higher requirements are put forward for rapid response and precision control. At present, fast-switching solenoid valves all achieve the switching action by electromagnetic drive and mechanical spring reset; precise displacement is mainly achieved by controlling the intake and exhaust of pneumatic solenoid valves to move the piston rod of the cylinder left and right, and even some manufacturers use the method of driving the connecting rod with a servo motor for displacement control.

[0003] The structures of current high-end equipment are becoming more and more compact, and the requirements for control precision are very strict. However, the existing fast-switching solenoid valves and cylinders cannot achieve precise control, and these two functions are not integrated into one body and need to be realized by two components. At present, the response time of fast-switching solenoid valves has reached nearly 500 Hz, which has reached the limit of mechanical movement, and there is no better solution when higher frequencies are required. At the same time, the current method for precise control of displacement is only limited to pneumatic solenoid valves to control the cylinder piston to achieve telescopic movement, with low control precision and slow response time, which brings a lot of troubles to the precise control of a batch of cutting-edge equipment. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The problem to be solved by the present invention is to provide a high-speed switch and precision control displacement solenoid valve, which has the advantages of both fast switching and precision control of displacement, breaks the structure of relying on spring reset for fast-switching valves in the prior art, uses double electric control to achieve high-frequency control, and at the same time uses the control method of double coils PID to precisely control the displacement of the moving spool.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the present invention provides a high-speed switch and precision control displacement solenoid valve, including.

[0008] A magnetic isolation tube assembly.

[0009] A moving spool, slidably installed in the magnetic isolation tube assembly.

[0010] A first coil and a second coil, respectively sleeved at both ends of the magnetic isolation tube assembly, for generating electromagnetic force to drive the moving spool to move in the magnetic isolation tube assembly.

[0011] A controller, electrically connected to the first coil and the second coil respectively, for controlling the on / off and current magnitude of the first coil and the second coil.

[0012] A displacement sensor is installed at one end of the magnetic isolation tube assembly and electrically connected to the controller, and is used to detect the position of the movable spool and feed back to the controller; one end of the movable spool passes through the displacement sensor and is placed outside the magnetic isolation 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 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 back to the controller.

[0014] In some embodiments, the controller has a fast switch mode and a precise displacement control mode; when in the fast switch mode, the controller controls the first coil and the second coil to be quickly and alternately powered on and off, so that the movable spool moves quickly back and forth, and the displacement sensor detects whether the movable spool moves in place each time; when in the precise displacement control mode, under the requirement of the movement precision of the displacement sensor, the first current sensor and the first current sensor detect the current magnitudes of the first coil and the second coil in real time and feed back to the controller, and the controller adjusts the current magnitudes of the first coil and the second coil in real time, so that the movable spool performs precise displacement.

[0015] In some embodiments, a magnetic field shielding block is sleeved in the middle of the magnetic isolation tube assembly. The magnetic field shielding block is located between the first coil and the second coil, and is used to make the magnetic fields generated by the first coil and the second coil not interfere with each other.

[0016] In some embodiments, the first coil and the second coil have the same structure and opposite winding directions; when the first coil is powered on, the movable spool moves upward; when the second coil is powered on, the movable spool moves downward; the controller is a PID controller.

[0017] In some embodiments, the magnetic isolation tube assembly includes a tubular magnetic isolation tube body, an upper fixed iron core fixed at the upper end of the magnetic isolation tube body, and a lower fixed iron core fixed at the lower end of the magnetic isolation tube body. The first coil and the second coil are both sleeved on the magnetic isolation tube body, and the movable spool can slide between the upper fixed iron core and the lower fixed iron core; a through first central hole is provided in the upper fixed iron core, and the displacement sensor is installed in the first central hole.

[0018] In some embodiments, the movable spool includes a cylindrical main body and an insertion post located at the upper end of the cylindrical main body, and the outer diameter of the insertion post is smaller than that of the cylindrical main body; a through second central hole is provided in the displacement sensor, and the insertion post is inserted into the second central hole.

[0019] In some embodiments, the upper end surface of the cylindrical main body faces the upper attracting surface of the upper fixed iron core, the lower end surface of the cylindrical main body faces the lower attracting surface of the lower fixed iron core, the area of the upper end surface of the cylindrical main body is smaller than that of its lower end surface, and the area of the upper attracting surface is smaller than that of the lower attracting surface.

[0020] In some embodiments, an upper gasket and an upper lock nut are installed on the displacement sensor, and the upper lock nut is used to lock the first coil; a lower gasket and a lower lock nut are installed on the lower fixed iron core, and the lower lock nut is used to lock the second coil.

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

[0022] (III) Beneficial effects.

[0023] A high-speed switch and a precision control displacement solenoid valve provided by the present invention have the following advantages compared with the prior art.

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

[0025] 2) The double-electric-control fast-switching mode breaks the previous design of the movable spool resetting by a spring. The structure that converts electrical energy into mechanical energy greatly improves the response speed of the movable spool in the solenoid valve, and at the same time overcomes the fatal defect that the spring reset speed is reduced due to residual magnetism caused by material reasons.

[0026] 3) The double-coil PID control method is adopted. When the current of the first coil is greater than the current of the second coil, the movable spool will move upward; when the current of the second coil is greater than the current of the first coil, the movable spool will move downward; when the displacement sensor is involved, it will always feedback the position of the movable spool to the controller, and the current magnitudes of the two coils are adjusted in real time through the cooperation of the current sensor and the controller, so as to achieve the precise displacement of the movable spool. Description of the drawings

[0027] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the attached drawings required in the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0028] Figure 1 It is a schematic structural diagram of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0029] Figure 2 It is a schematic structural diagram of two current sensors of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0030] Figure 3 It is a schematic structural diagram of a high-speed switch and a precision control displacement solenoid valve of the present invention when a magnetic field shielding block is not installed to generate a magnetic field interference area.

[0031] Figure 4 It is a schematic structural diagram of the magnetic field distribution after a magnetic field shielding block is installed for a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0032] Figure 5 It is a schematic structural diagram of the connection between the first coil and the magnetic isolation tube assembly of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0033] Figure 6 It is a schematic structural diagram of the connection between the second coil and the magnetic isolation tube assembly of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0034] Figure 7 It is a schematic structural diagram of the connection between the first coil, the second coil and the magnetic isolation tube assembly of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0035] Figure 8 It is a schematic structural diagram of the magnetic isolation tube assembly of a high-speed switch and a precision control displacement solenoid valve of the present invention.

[0036] Figure 9 It is a schematic structural diagram of a high-speed switch and a precision control displacement solenoid valve of the present invention when the movable spool is in the middle position.

[0037] Figure 10 It is a schematic structural diagram of a high-speed switch and a precision control displacement solenoid valve of the present invention when the movable spool moves upward.

[0038] Figure 11 It is a schematic structural diagram of a high-speed switch and a precision control displacement solenoid valve of the present invention when the movable spool moves downward.

[0039] Figure 12This is a schematic structural diagram of a high-speed switch and a precision-controlled displacement solenoid valve's moving spool according to the present invention.

[0040] Figure 13 This is a schematic structural diagram of an existing cylinder.

[0041] The corresponding component names for the reference numerals in the figure are: 1. Magnetic isolation tube assembly; 101. Magnetic isolation tube body; 102. Upper fixed iron core; 103. Lower fixed iron core; 104. First central hole; 105. Upper suction surface; 106. Lower suction surface; 2. Moving spool; 201. Cylindrical main body; 202. Insertion post; 3. First coil; 4. Second coil; 5. Controller; 501. First current sensor; 502. Second current sensor; 6. Displacement sensor; 601. Second central hole; 7. Magnetic field shielding block; 8. Upper gasket; 9. Upper locking nut; 10. Lower gasket; 11. Lower locking nut. Specific embodiments

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

[0043] The following illustrates the implementation manners of the present application through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0044] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should 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 described herein can be used to implement the device and / or practice the method. Additionally, this device and / or this method can be implemented using other structures and / or functionality in addition to one or more of the aspects described herein.

[0045] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0046] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0047] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0048] See also Figures 1 to 12 The present invention provides a high-speed switch and precision control displacement solenoid valve, including a magnetic isolation 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 also Figure 1 , the movable valve core 2 is slidably installed in the magnetic isolation tube assembly 1, and the movable valve core 2 can slide along the axial direction of the magnetic isolation tube assembly 1. The first coil 3 and the second coil 4 are respectively mounted on the two ends of the magnetic isolation tube assembly 1, and are used to generate electromagnetic force to drive the movable valve core 2 to move in the magnetic isolation tube assembly 1; wherein, the first coil 3 and the second coil 4 have opposite driving forces on the movable valve core 2. The controller 5 is electrically connected to the first coil 3 and the second coil 4, respectively, and is used to control the power on and off of the first coil 3 and the second coil 4 and the current size. The controller 5 controls the power on and off of the two coils to realize the function of fast switching, and the controller 5 controls the current size of the two coils to realize the function of precise displacement control. The displacement sensor 6 is installed at one end of the magnetic isolation tube assembly 1 and is electrically connected to the controller 5, and is used to detect the position of the movable valve core 2 and feed it 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 isolation tube assembly 1. This solenoid valve has a simple and compact structure, can have the functions of fast switching and precise displacement control, is powerful, and has good use effect.

[0050] In some embodiments, 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 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 of the second coil 4 in real time and feed it back to the controller 5. Two current sensors are used to detect the current of the two coils in real time, and after the current is detected, it can be fed back to the controller 5 in time, so that the controller 5 can accurately adjust the current of the two coils.

[0051] In some embodiments, as Figure 2 shown, the controller 5 has two control modes, namely the fast switching mode and the precise displacement control mode; when the controller 5 selects the fast switching mode, the double-electronic-controlled power-on time (0.1 ms to 50 ms) can be set in the controller 5; when the controller 5 clicks the start button, the controller 5 controls the first coil 3 and the second coil 4 to quickly alternate between power-on and power-off, so that the movable spool 2 moves quickly back and forth. In this mode, the displacement sensor 6 is used to detect whether the movable spool 2 moves in place each time, so as to facilitate the controller 5 to control the switching of power-on and power-off of the two coils. When the controller 5 selects the precise displacement control mode, under the requirement of the movement accuracy of the displacement sensor 6, the first current sensor 501 and the first current sensor 501 detect the current magnitudes of the first coil 3 and the second coil 4 in real time and feedback them to the controller 5. The controller 5 adjusts the current magnitudes of the first coil 3 and the second coil 4 in real time, so that the movable spool 2 performs precise displacement to reach the optimal expansion and contraction point.

[0052] This structure can realize the mutual switching of the above two functions; in the fast switching mode (high frequency), when the first coil 3 is powered on, under the action of the magnetic field of the first coil 3, the movable spool 2 is attracted upward, and under the action of the displacement sensor 6, a feedback signal is sent, indicating that the movable spool 2 has completed the movement in place; when the first coil 3 is powered off and the magnetic field disappears, the second coil 4 is powered on, and under the action of the magnetic field of the second coil 4, the movable spool 2 is attracted downward, and under the action of the displacement sensor 6, a feedback signal is sent, indicating that the movable spool 2 has completed the separation in place; the above control mode is a double-electronic-controlled method, that is, when the first coil 3 is powered on, the second coil 4 is powered off, and when the second coil 4 is powered on, the first coil 3 is powered off. The faster the electrical signal is switched, the faster the movable spool 2 moves. This fast switching structure breaks the previous design that the movable spool relies on the spring to reset. The structure that converts electrical energy into mechanical energy greatly improves the response speed of the movable spool in the solenoid valve, and at the same time overcomes the fatal defect that the spring reset speed is reduced due to the residual magnetic force caused by the material.

[0053] In the precise displacement control mode, the two coils are powered on at the same time, and the movement direction of the movable spool is not clear under the action of their respective magnetic fields. At this time, it is like a tug-of-war; but under the requirement of the displacement sensor 6 (how much distance needs to be moved), and through the cooperation of the controller and the two current sensors, when the movable spool needs to move upward, the controller will increase the current value of the first coil 3 and decrease the current value of the second coil 4, so that the movable spool 2 moves upward; when the movable spool needs to move downward, the controller will decrease the current value of the first coil 3 and increase the current value of the second coil 4, so that the movable spool 2 moves downward; the more precise the current increase or decrease of the two coils, the more precise the displacement of the movable spool.

[0054] In some embodiments, as Figure 3and Figure 4 As shown, a magnetic field shielding block 7 is sleeved in the middle of the magnetic isolation tube assembly 1. The magnetic field shielding block 7 is located between the first coil 3 and the second coil 4, and the magnetic field shielding block 7 is used to make the magnetic fields generated by the first coil 3 and the second coil 4 not interfere 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 force interference area will be generated at the intersection of the two coils (as shown in Figure 3 ); In the present invention, a magnetic field shielding block is provided between the two coils, so that the magnetic field is not affected when the double coils work simultaneously, and the maximum magnetic force of each can be independently exerted.

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

[0056] As shown in Figure 5 , the first coil 3 is sleeved at one end of the magnetic isolation tube assembly and fixed. When the first coil 3 is energized to generate a magnetic field, the movable spool 2 moves in the direction of the upper fixed iron core 102 under the action of the magnetic field until it is attracted and a moving action is completed. As shown in Figure 6 , the second coil 4 is sleeved at the other end of the magnetic isolation tube assembly and fixed. When the second coil 4 is energized to generate a magnetic field, the movable spool 2 moves in the direction of the lower fixed iron core 103 under the action of the magnetic field until it is attracted, and a moving action is also completed. The above actions are in the form of single electric control. As shown in Figure 7 , when the first coil 3 and the second coil 4 are simultaneously installed at the upper and lower ends of the magnetic isolation tube assembly, in order to achieve the purpose of the rapid movement of the movable spool 2, the control method has to become double electric control; at this time, the faster the signal of the double electric control is, the faster the movable spool 2 moves, and the switching speed completely exceeds that of the high-frequency solenoid valve using the spring reset method.

[0057] In some embodiments, as shown in Figure 7 and Figure 8As shown in the figure, the magnetic isolation tube assembly 1 includes a tubular magnetic isolation tube body 101, an upper fixed iron core 102 fixed to the upper end of the magnetic isolation tube body 101, and a lower fixed iron core 103 fixed to the lower end of the magnetic isolation tube body 101. The upper fixed iron core 102 and the lower fixed iron core 103 are both fixed in the magnetic isolation tube body 101 by laser welding, and the sealing and fixing effects are good by using laser welding. The first coil 3 and the second coil 4 are both sleeved on the magnetic isolation tube body 101, and 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. The magnetic isolation tube assembly 1 can form a magnetic circuit demarcation point for the magnetic field, making the displacement direction of the movable valve core 2 more definite.

[0058] Referring to Figures 9 to 11 As shown in the figure, the present invention adopts a double-coil PID control method to solve the precise displacement of the movable valve core. As Figure 9 shown, when the same current is passed through the first coil and the second coil, the magnetic forces of the coils are equal respectively, and the movable valve core 2 will stay at the middle position of the magnetic isolation tube assembly, in a force balance state. As Figure 10 shown, when the current of the first coil is greater than the current of the second coil, the movable valve core 2 will move upward. As Figure 11 shown, when the current of the second coil is greater than the current of the first coil, the movable valve core 2 will move downward. When the displacement sensor 6 intervenes, it will feedback the position of the movable valve core to the controller in real time, and the current magnitudes of the two coils will be adjusted in real time through the cooperation of the current sensor and the controller, so as to achieve the precise displacement of the movable valve core.

[0059] In some embodiments, such as Figure 7 , Figure 8 and Figure 12As shown in the figure, the movable valve core 2 includes a cylindrical main body 201 and an insertion post 202 located at the upper end of the cylindrical main body 201. The cylindrical main body 201 and the insertion post 202 are of an integral structure design, and the outer diameter of the insertion post 202 is smaller than that of the cylindrical main body 201. A through second central hole 601 is provided inside the displacement sensor 6, and the insertion post 202 is inserted into the second central hole 601. The upper end face of the cylindrical main body 201 faces the upper suction surface 105 of the upper fixed iron core 102, and the lower end face of the cylindrical main body 201 faces the lower suction surface 106 of the lower fixed iron core 103. The area of the upper end face of the cylindrical main body 201 is smaller than that of its lower end face, and the area of the upper suction surface 105 is smaller than that of the lower suction surface 106. In the magnetic isolation tube assembly, the areas of the upper suction surface 105 and the lower suction surface 106 are different, and under the condition of the same coil power, the electromagnetic suction forces will be different; at the same time, the end face areas at both ends of the cylindrical main body 201 are different, and the induced electromagnetic forces are also different; in the present invention, the areas of the upper suction surface 105 and the lower suction surface 106 are designed to be different, so that the initial forces of the two coils for pulling are different, and the currents of the double coils will not be in a conflicting state.

[0060] In some embodiments, as Figure 1 shown in the figure, an upper gasket 8 and an upper locking nut 9 are installed on the displacement sensor 6, and the upper locking nut 9 is used to lock the first coil 3; a lower gasket 10 and a lower locking nut 11 are installed on the lower fixed iron core 103, and the lower locking nut 11 is used to lock the second coil 4.

[0061] As Figure 13 shown in the figure, in the cylinder of the prior art, in order to achieve the control accuracy of the cylinder movement, it is necessary to perform a quick response test on the pneumatic two-way three-way solenoid valve to facilitate the accurate control of the thrust after the gas enters the cylinder to push the telescopic distance of the cylinder piston rod. After comparison, it is found that the control accuracy of the cylinder is low, the displacement is not smooth enough, and the speed is fast and slow. However, the present invention directly converts electrical energy into mechanical energy. Under the action of the PID controller, it can not only achieve a quick response switch, but also achieve a displacement of the micron level, with a fast speed, high accuracy, and good stability.

[0062] For the same and similar parts among the various embodiments in this specification, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0063] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-speed switch and a precision control displacement solenoid valve, characterized in that Comprising: A magnetic isolation tube assembly (1); A movable valve core (2), slidably mounted within the magnetic isolation tube assembly (1); A first coil (3) and a second coil (4), respectively sleeved at both ends of the magnetic isolation tube assembly (1), for generating an electromagnetic force to drive the movable valve core (2) to move within the magnetic isolation tube assembly (1); A controller (5), electrically connected to the first coil (3) and the second coil (4) respectively, for controlling the on / off and current magnitude of the first coil (3) and the second coil (4); A displacement sensor (6), mounted at one end of the magnetic isolation tube assembly (1) and electrically connected to the controller (5), for detecting the position of the movable valve core (2) and feeding it 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 isolation tube assembly (1).

2. The high-speed switch and the precision control displacement solenoid valve according to 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), for real-time detecting the current magnitude of the first coil (3) and feeding it back to the controller (5); The second current sensor (502) is electrically connected to the second coil (4), for real-time detecting the current magnitude of the second coil (4) and feeding it back to the controller (5).

3. The high-speed switch and the precision control displacement solenoid valve according to claim 2, characterized in that: The controller (5) has a fast switch mode and a precision displacement control mode; When in the fast switch mode, the controller (5) controls the first coil (3) and the second coil (4) to be quickly and alternately powered on and off, so that the movable valve core (2) moves quickly back and forth, and the displacement sensor (6) detects whether the movable valve core (2) moves in place each time; When in the precision displacement control mode, under the requirement of the movement precision of the displacement sensor (6), the first current sensor (501) and the first current sensor (501) real-time detect the current magnitudes of the first coil (3) and the second coil (4) and feed them back to the controller (5), and the controller (5) adjusts the current magnitudes of the first coil (3) and the second coil (4) in real time, so that the movable valve core (2) performs precise displacement.

4. The high-speed switch and the precision-controlled displacement solenoid valve according to claim 1, characterized in that: A magnetic field shielding block (7) is sleeved in the middle of the magnetic isolation tube assembly (1), the magnetic field shielding block (7) is located between the first coil (3) and the second coil (4), and the magnetic field shielding block (7) is used to make the magnetic fields generated by the first coil (3) and the second coil (4) not interfere with each other.

5. The high-speed switch and the precision control displacement solenoid valve according to claim 1, characterized in that: The first coil (3) and the second coil (4) have the same structure, and the winding directions of the coils are opposite; When the first coil (3) is powered on, the movable valve core (2) moves upward; When the second coil (4) is powered on, the movable valve core (2) moves downward; The controller (5) is a PID controller.

6. The high-speed switch and the precision control displacement solenoid valve according to claim 1, characterized in that: The magnetic isolation tube assembly (1) includes a tubular magnetic isolation tube body (101), an upper fixed iron core (102) fixed to the upper end of the magnetic isolation tube body (101), and a lower fixed iron core (103) fixed to the lower end of the magnetic isolation tube body (101). The first coil (3) and the second coil (4) are both sleeved on the magnetic isolation tube body (101), and 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).

7. The high-speed switch and the precision-controlled displacement solenoid valve according to claim 6, characterized in that: The movable valve core (2) includes a cylindrical main body (201) and an insertion post (202) located at the upper end of the cylindrical main body (201). The outer diameter of the insertion post (202) is smaller than the outer diameter of the cylindrical main body (201). A through second central hole (601) is provided in the displacement sensor (6), and the insertion post (202) is inserted into the second central hole (601).

8. The high-speed switch and the precision control displacement solenoid valve according to claim 7, characterized in that: The upper end face of the cylindrical main body (201) faces the upper suction surface (105) of the upper fixed iron core (102), and the lower end face of the cylindrical main body (201) faces the lower suction surface (106) of the lower fixed iron core (103). The area of the upper end face of the cylindrical main 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).

9. The high-speed switch and the precision control displacement solenoid valve according to claim 6, characterized in that: An upper gasket (8) and an upper locking nut (9) are installed on the displacement sensor (6), and the upper locking nut (9) is used to lock the first coil (3). A lower gasket (10) and a lower locking nut (11) are installed on the lower fixed iron core (103), and the lower locking nut (11) is used to lock the second coil (4).

10. The high-speed switch and the precision control displacement solenoid valve according to claim 6, characterized in that: Both the upper fixed iron core (102) and the lower fixed iron core (103) are fixed in the magnetic isolation tube body (101) by laser welding.

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