Magnetomotive switch structure of relay

Abstract

A magnetomotive switch structure of a relay is arranged in the relay and is adjacent to a coil assembly, a movable iron core is movably inserted in the coil assembly, the magnetomotive switch structure has two embodiments, the magnetomotive switch structure comprises a change-over switch assembly, a lower magnetomotive assembly and an upper magnetomotive assembly, and the difference is that the combination between the lower magnetomotive assembly and the change-over switch is that one is movable contact, and the other is movable contact. The other mode is connection and fixation; the coil group drives the movable iron core to move up and down and links the upper magnetic group to move under the power-on and power-off operation, and the displacement of the upper magnetic group changes the distance between the upper magnetic group and the lower magnetic group, so that the magnetic pole acting force between the upper magnetic group and the lower magnetic group is changed, the switching-on and switching-off of the change-over switch group are further controlled, excessive mechanical mechanisms are omitted, and the cost is reduced. And for manufacturers, the cost is more saved, and obviously, the manufacturing and maintenance operations in the future are easier, simpler and more convenient.

Description

Technical Field

[0001] This invention relates to a magnetic switch structure for a relay, specifically a technology applied in the field of relays. Background Technology

[0002] Different types of relays have unique operating methods. Today, we are discussing the use of electromagnetic relays. Electromagnetic relays are often used in electric vehicles. By setting up electromagnetic relays, the positive and negative contacts of the battery can be disconnected when the vehicle malfunctions, so as to ensure safety.

[0003] However, the above approach has problems. Electromagnetic relays are prone to sticking together due to instantaneous high current. Even if the power source is cut off, it cannot be guaranteed that the load circuit has been safely disconnected, so there is still a safety risk. Therefore, another type of relay has been introduced on the market that operates through the combination of a movable iron core and a coil, with the switch set separately. However, the mechanical structure of the aforementioned relay with a movable iron core is more complex in the switching part, which requires manufacturers to spend more money. Moreover, the mechanical structure is prone to wear and tear under normal operation.

[0004] Another type of relay uses the magnetic attraction and repulsion principle of two magnets to switch on and off; please see [link to relevant documentation]. Figure 14 As shown, the two magnets 4 are arranged with a vertical spacing, and the switch 5 is located between the two magnets 4. When the upper magnet 4 moves away from the lower magnet 4, the switch 5 will not be affected by the magnetism and will not operate. However, when the upper magnet 4 moves closer to the lower magnet 4, the switch 5 will be affected by the magnetism and will open (the solid arrow indicates the direction of movement of the upper magnet 4, and the dashed arrow indicates the direction of opening of the switch 5). The problem with this type of relay is that the switch 5, after being affected by the magnetism of the upper and lower magnets 4 for a long time, will gradually become assimilated, eventually losing its ability to be attracted by the upper and lower magnets 4 and operate. Alternatively, the two ends of the switch 5 may deform due to the long-term magnetic attraction of the upper and lower magnets 4, causing the metal parts of the switch 5 to become fatigued, eventually leading to incomplete closure. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a magnetic switch structure for a relay, which simplifies the mechanical structure complexity of the switch switching inside the relay, thereby saving manufacturing costs and reducing the problems caused by wear and tear during long-term operation. The technical solution adopted by this invention to solve its technical problem is:

[0006] A magnetic switch structure for a relay is installed inside the relay and adjacent to a coil assembly, with a movable iron core movably inserted into the coil assembly. The structure includes: a switching group corresponding to one end of the movable iron core inserted into the coil assembly and located below the coil assembly; a lower magnetic group located between the switching group and the movable iron core, and connected to the switching group; and an upper magnetic group sleeved at the end of the movable iron core, with a gap between it and the lower magnetic group. The lower and upper magnetic groups are magnetically connected. When the coil assembly is energized or de-energized, it drives the movable iron core to move up and down, which in turn moves the upper magnetic group. The change in the displacement of the upper magnetic group and the distance between it and the lower magnetic group alters the magnetic force between them, thereby controlling the switching group to open and close.

[0007] The beneficial effects of this invention are that it simplifies the mechanical structure complexity of switching within a relay, thereby saving manufacturing costs and reducing the problems caused by wear and tear during long-term operation. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0009] Figure 1 This is a three-dimensional schematic diagram of the first embodiment of the present invention.

[0010] Figure 2 This is an exploded perspective view of the first embodiment of the present invention.

[0011] Figure 3 for Figure 2 Detailed three-dimensional diagram of the breakdown.

[0012] Figure 4 for Figure 2 A three-dimensional schematic diagram of the switching group from another perspective.

[0013] Figure 5 for Figure 1 The diagram shows the cross-sectional action of line segment V-V, where the upper and lower magnetic moving groups are magnetically repelled. Before the coil group is energized and the moving iron core has moved, the lower magnetic moving group pushes against the spring, stores elastic force, and contacts the positioning contact.

[0014] Figure 6 for Figure 5 The diagram shows the cross-sectional action of the coil group after it is energized, which causes the movable iron core and the upper magnetic drive group to move, thereby controlling the operation of the switching switch group, so that the spring of the switching switch is elastically reset and moves away from the positioning contact.

[0015] Figure 7The second embodiment of the present invention shows that the upper and lower magnetic actuators are magnetically repelled. Before the coil group is energized and the movable iron core has moved, the lower magnetic actuator pushes against the spring sheet to store elastic force and move away from the positioning contact.

[0016] Figure 8 for Figure 7 The diagram shows the cross-sectional action of the coil group after it is energized, which causes the movable iron core and the upper magnetic drive group to move, thereby controlling the operation of the switching switch group, so that the spring of the switching switch is elastically reset and contacts the positioning contact.

[0017] Figure 9 This is a three-dimensional schematic diagram of another embodiment of the lower support of the present invention.

[0018] Figure 10 The third embodiment of the present invention shows a cross-sectional view of the upper and lower magnetic moving groups being magnetically attracted to each other, with the coil group not yet energized and the movable iron core not moving. The lower magnetic moving group causes the end of the spring piece with the movable contact to deform and store energy, moving away from the positioning contact.

[0019] Figure 11 for Figure 10 The diagram shows the action of a coil group being energized, where the movable iron core and upper magnetic drive group move, and the end of the spring with the movable contact elastically resets and contacts the positioning contact.

[0020] Figure 12 The fourth embodiment of the present invention shows a cross-sectional view of the action where the upper and lower magnetic actuators are magnetically attracted to each other, the coil group is not energized, the movable iron core is not moved, and the lower magnetic actuator drives the end of the spring with the movable contact to deform and store force to contact the positioning contact.

[0021] Figure 13 for Figure 12 The diagram shows the action of a coil group being energized, where the movable iron core and upper magnetic drive group move, and the end of the spring with the movable contact elastically resets and moves away from the positioning contact.

[0022] Figure 14 This is a schematic diagram of the internal structure of an existing relay. Explanation of the labels in the diagram: Relay 100 Coil group 200 Iron Heart 300 Switch group 1 Base 11 Limiting groove 110 First connector 12 Second connector 13 Positioning contact 131 Shrapnel 14 Movable contact 141 Lower magnetic group 2 Lower magnet 21 Lower bracket 22 Mounting slot 221 Bump 222 Upper convex part 222A Lower convex part 222B Connector 222C Upper magnetic group 3 Upper magnet 31 32 movable seats Assembly slot 321 Signal terminal 6 Clamping gap D Magnet 4 Switch 5 Detailed Implementation

[0023] Please see Figures 1 to 12 As shown, the present invention discloses a magnetic switch structure for a relay, which is installed inside the relay 100 and adjacent to the coil group 200. A movable iron core 300 is movably inserted into the coil group 200. The present invention mainly has two main embodiments (distinguished by magnetic attraction and magnetic repulsion). The first embodiment is described below. Figures 1 to 6 As shown, it includes: a switching group 1 disposed inside the relay 100, corresponding to the movable iron core 300 inserted into one end of the coil group 200 and located below the coil group 200; a lower magnetic actuation group 2, which is located between the switching group 1 and the movable iron core 300, and the lower magnetic actuation group 2 is in contact with the switching group 1; and an upper magnetic actuation group 3, which is sleeved on the end of the movable iron core 300 and forms a gap with the lower magnetic actuation group 2, and the lower magnetic actuation group 2 and the upper magnetic actuation group 3 are magnetically repelled; wherein, when the coil group 200 is energized or de-energized, it drives the movable iron core 300 to move up and down and moves the upper magnetic actuation group 3 in conjunction with it. The change in the displacement of the upper magnetic actuation group 3 and the distance between it and the lower magnetic actuation group 2 changes the repulsive force between the upper magnetic actuation group 3 and the lower magnetic actuation group 2, thereby controlling the switching group 1 to open and close.

[0024] According to the above description, the present invention provides a switching group 1, a lower magnetic actuation group 2, and an upper magnetic actuation group 3 within the relay 100. It utilizes the principle that an electromagnetic field is generated between the coil group 200 and the movable iron core 300 after energization, driving the movement of the upper magnetic actuation group 3. By changing the distance between the upper magnetic actuation group 3 and the lower magnetic actuation group 2, the magnetic repulsion force changes with the distance, further controlling the switching group 1 to switch on and off. This magnetic control of the switching group 1 solves the problem of the complex mechanical structure of existing relays with similar technology, saving significant costs and facilitating future manufacturing, maintenance, and repair. Furthermore, the present invention positions the switching group 1 below the lower magnetic actuation group 2, ensuring that the magnetic force between the upper magnetic actuation group 3 and the lower magnetic actuation group 2 is not interfered with by other parts. The lower magnetic actuation group 2 can reliably drive the switching group 1 to operate, and the switching group 1 does not... Figure 14 As revealed, both the top and bottom are affected by the magnetic force of the magnet, demonstrating that the present invention truly improves upon existing problems and is more progressive.

[0025] Continuing the above description, in the mode where the upper magnetic actuation group 3 and the lower magnetic actuation group 2 are magnetically repelled, the switching switch group 1 further includes a base 11, a first pin connector 12, a second pin connector 13, and a spring contact 14. The base 11 is installed inside the relay 100 and abuts against the bottom surface of the coil group 200. A limiting groove 110 is recessed inward on the bottom surface of the base 11. The first pin connector 12 and the second pin connector 13 are installed at opposite ends of the limiting groove 110. The spring contact 14 is electrically connected to the first pin connector 12 at one end, and a movable contact 141 is provided at the other end of the spring contact 14 to movably contact the positioning contact 131 of the second pin connector 13. In the two embodiments, the positioning contact 131 of the second pin connector 13 is respectively set at the two ends of the elastic swing of the spring contact 14. Please see Figure 5 , Figure 6 When the upper magnetic actuator 3 and the lower magnetic actuator 2 are in a magnetically repulsive mode, the end of the second pin connector 13 with the positioning contact 131 will be located below the spring 14. Therefore, when the coil group 200 is not powered, the movable iron core 300 will not move. At this time, the distance between the upper magnetic actuator 3 and the lower magnetic actuator 2 is the closest, and the magnetic repulsive force is also the greatest. Therefore, the lower magnetic actuator 2 will push against the spring 14, causing the end of the spring 14 with the movable contact 141 to elastically deform and contact the positioning contact 131 of the second pin connector 13 with stored force. At this time, it is in the closed state. Figure 5 ).

[0026] Please see Figure 6When current enters the coil group 200, the coil group 200 generates an electromagnetic field and drives the movable iron core 300 to move upward, causing the upper magnetic moving group 3 to move together. As the upper magnetic moving group 3 moves, the distance between it and the lower magnetic moving group 2 increases. As the distance increases, the magnetic repulsion force weakens. At this time, the elastic stored force of the spring 14 gradually exceeds the repulsion force, causing the end of the spring 14 with the movable contact 141 to elastically return and release the movable contact 141 from contact with the positioning contact 131. This is the open state. Figure 6 ).

[0027] Continuing the above explanation, when the upper magnetic actuator group 3 and the lower magnetic actuator group 2 are in a repulsive state, except... Figure 5 , Figure 6 The second pin connector 13 shown has a positioning contact 131 at one end located below the spring contact 14. Different types of relays 100 may also have a second pin connector 13 with one end of the positioning contact 131 located above the spring contact 14, such as... Figure 7 , Figure 8 The second embodiment shown differs from the first embodiment in its operation of the spring 14. Simply put, when the coil group 200 is not energized and the movable iron core 300 and the upper magnetic actuator 3 have not moved, the distance between the upper magnetic actuator 3 and the lower magnetic actuator 2 is closest, and the repulsive force is greatest. Therefore, the end of the spring 14 with the movable contact 141 will deform, store energy, and move away from the positioning contact 131 of the second pin 13 (e.g., ...). Figure 7 Conversely, when the coil group 200 is energized and the movable iron core 300 drives the upper magnetic group 3 to move upward, the distance between the upper magnetic group 3 and the lower magnetic group 2 increases, reducing the repulsive force. Since the stored force of the spring piece 14 is greater than the repulsive force, the end of the spring piece 14 with the movable contact 141 will elastically return and contact the positioning contact 131 of the second pin connector 13 (e.g., ...). Figure 8 It can be seen that different relays 100 will have different operating methods.

[0028] The above description indicates that the upper magnetic actuator 3 and the lower magnetic actuator 2 are in a repulsive state. The following description indicates an attractive state. In the attractive state, the lower magnetic actuator 2 will be fixed to the spring piece 14, or... Figure 9The protrusion 222 of the lower support 22 is modified to include an upper protrusion 222A, a lower protrusion 222B, and a connecting portion 222C connecting the upper protrusion 222A and the lower protrusion 222B. A clamping gap D is formed between the upper protrusion 222A, the lower protrusion 222B, and the connecting portion 222C. The spring piece 14 is clamped in the clamping gap D. When the coil group 200 is not electrically connected and the movable iron core 300 is not moved, the distance between the upper magnetic moving group 3 and the lower magnetic moving group 2 is the closest, and the attraction force is the greatest at this time. Therefore, the lower magnetic moving group 2 will drive the end of the spring piece 14 with the movable contact 141 away from the lower positioning contact 131, and the spring piece 14 will elastically deform and store force due to being driven. Figure 10 When the coil group 200 is powered on, the movable iron core 300 will move upward and drive the upper magnetic group 3 to move. The displacement of the upper magnetic group 3 increases the distance between it and the lower magnetic group 2. At this time, the increase in distance weakens the attraction force, so the elastic deformation and storage force of the spring 14 is greater than the attraction force. Therefore, the end of the spring 14 with the movable contact 141 will elastically reset and contact the positioning contact 131 located below. Figure 11 ).

[0029] Continuing from the above, when the upper magnetic actuator 3 and the lower magnetic actuator 2 are attracted to each other and one end of the second pin connector 13 with the positioning contact 131 is located above the spring piece 14, when the coil group 200 is not yet energized and the movable iron core 300 has not yet driven the upper magnetic actuator 3 to move, the distance between the upper magnetic actuator 3 and the lower magnetic actuator 2 is the shortest and the attraction force is the greatest. Therefore, the lower magnetic actuator 2 will pull the spring piece 14 to deform and store force, and the end with the movable contact 141 will contact the positioning contact 131 of the second pin connector 13. Figure 12 Conversely, when the coil group 200 is energized and the movable iron core 300 drives the upper magnetic group 3 to move upward, the distance between the upper magnetic group 3 and the lower magnetic group 2 increases, and the attraction force decreases accordingly. At this time, the stored force of the spring 14 is greater than the attraction force, so the spring 14 will elastically reset and control the movable contact 141 and the contact 131 away from the positioning contact 131. Figure 13 ).

[0030] Please see Figures 3 to 6As shown, according to the above description of the operation of the lower magnetic actuator 2, the lower magnetic actuator 2 further includes a lower magnet 21 and a lower support 22. The lower support 22 is further provided with mounting grooves 221 and protrusions 222 at opposite ends, and the lower magnet 21 is installed in the mounting groove 221. The upper magnetic actuator 3 includes an upper magnet 31 and a movable seat 32. The movable seat 32 is fitted onto the end of the movable iron core 300, and the movable seat 32 is provided with an assembly groove 321 on the side corresponding to the lower magnetic actuator 2, and the upper magnet 31 is installed in the assembly groove 321. Therefore, when the coil assembly 200 is not energized and the movable iron core 300 has not moved, the distance between the upper magnet 31 and the lower magnet 21 is the closest and the attraction and repulsion forces are the greatest. Therefore, in the repulsive mode, the protrusions 222 of the lower support 22 will push the spring 14 to deform and store force, while in the attractive mode, the protrusions 222 are connected to the spring 14, and the spring 14 is pulled to deform and store force when the lower support 22 moves. Conversely, after the coil group 200 is energized and drives the movable iron core 300 to move, the movable iron core 300 will drive the entire upper magnetic moving group 3, so that the upper magnet 31 of the upper magnetic moving group 3 is away from the lower magnet 21. When the distance increases, regardless of whether the upper magnet 31 and the lower magnet 21 are in the repulsive or attractive mode, their force will decrease with the distance, so that the force of the spring 14 after deformation and storage is greater than the attraction and repulsion force, and thus the spring 14 can elastically return to its original position, thereby achieving the switching operation.

[0031] Please see the last one. Figure 2 , Figure 3 , Figure 5 As shown, a signal terminal 6 is provided inside the coil group 200 on the side of the relay 100. One end of the signal terminal 6 is electrically connected to the first pin connector 12 and the second pin connector 13, while the other end of the signal terminal 6 is connected to an external detection machine (not shown). The main function of the signal terminal 6 is to provide the detection machine with the ability to detect the continuity or disconnection between the first pin connector 12 and the second pin connector 13. During quality inspection, the signal terminal 6 is used as the signal transmission medium between the detection machine and the relay 100, so that during testing, it can be clearly known whether the spring 14 between the first pin connector 12 and the second pin connector 13 operates normally when the relay 100 is energized or de-energized, thereby improving the high yield of the relay 100 in production.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A magnetic switch structure for a relay, wherein the structure is installed inside the relay and adjacent to the coil assembly, and a movable iron core is movably inserted into the coil assembly, characterized in that, include: A switching group is provided, which corresponds to the movable iron core insertion group at one end of the coil group and is located below the coil group; The lower magnetic actuator is located between the switching assembly and the movable iron core, and the lower magnetic actuator is connected to the switching assembly. The upper magnetic actuator is sleeved at the end of the movable iron core and has a gap with the lower magnetic actuator. The lower magnetic actuator and the upper magnetic actuator are set by magnetic principle. The coil group, when energized or de-energized, drives the movable iron core to move up and down and moves the upper magnetic actuator to a different position. The change in the displacement of the upper magnetic actuator and the distance between it and the lower magnetic actuator changes the magnetic pole force between them, thereby controlling the opening and closing of the switching switch group.

2. The magnetic switch structure of the relay according to claim 1, characterized in that, The switching assembly further includes a base, a first pin connector, a second pin connector, and a spring contact. The base is installed inside the relay and abuts against the bottom surface of the coil assembly. A limiting groove is recessed inward on the bottom surface of the base. The first pin connector and the second pin connector are installed at opposite ends of the limiting groove. The spring contact is electrically connected to the first pin connector at one end, and a movable contact is provided at the other end of the spring contact to movably contact the positioning contact of the second pin connector. The positioning contact is located below the movable contact. When the coil assembly is not energized and the movable iron core is not moving upward, there is a magnetic repulsion between the upper and lower magnetic actuators. At this time, the repulsive force is greater than the spring force, causing the lower magnetic actuator to push the spring part, so that the end of the spring with the movable contact contacts the positioning contact and deforms and stores elastic force. After the coil assembly is energized and the movable iron core moves upward, the distance between the upper and lower magnetic actuators increases, and the magnetic repulsion decreases with the increase of distance. When the force is less than the spring force, the end of the spring with the movable contact is released from contact with the positioning contact.

3. The magnetic switch structure of the relay according to claim 1, characterized in that, The switching assembly further includes a base, a first pin connector, a second pin connector, and a spring contact. The base is installed inside the relay and abuts against the bottom surface of the coil assembly. A limiting groove is recessed inward on the bottom surface of the base. The first pin connector and the second pin connector are installed at opposite ends of the limiting groove. The spring contact is electrically connected to the first pin connector at one end, and a movable contact is provided at the other end of the spring contact to movably contact the positioning contact of the second pin connector. The positioning contact is located above the movable contact. When the coil assembly is not energized and the movable iron core is not moving upward, the magnetic repulsion between the upper and lower magnetic actuators is greater than the spring force of the spring, causing the lower magnetic actuator to push the spring part, making the end of the spring with the movable contact move away from the positioning contact and deform and store elastic force. After the coil assembly is energized and the movable iron core moves upward, the distance between the upper and lower magnetic actuators increases, and the magnetic repulsion decreases with the increase of distance. When the force is less than the spring force of the spring, the end of the spring with the movable contact will contact the positioning contact.

4. The magnetic switch structure of the relay according to any one of claims 2 to 3, characterized in that, The lower magnetic actuation assembly further includes a lower magnet and a lower bracket. The lower bracket is further provided with a mounting groove and a protrusion at opposite ends. The lower magnet is installed in the mounting groove, and the protrusion is normally in contact with the spring piece.

5. The magnetic switch structure of the relay according to claim 4, characterized in that, The upper magnetic actuator further includes an upper magnet and a movable seat. The movable seat is fitted onto the end of the movable iron core, and an assembly groove is recessed on the side of the movable seat corresponding to the lower magnetic actuator. The upper magnet is installed in the assembly groove. When the coil assembly is energized and generates an electromagnetic field, the movable iron core moves upward and drives the movable seat to move together. The movement of the movable seat will also drive the upper magnet away from the lower magnet, thereby increasing the distance and reducing the magnetic repulsion force.

6. The magnetic switch structure of the relay according to claim 1, characterized in that, The switching assembly further includes a base, a first pin connector, a second pin connector, and a spring contact. The base is installed inside the relay and abuts against the bottom surface of the coil assembly. A limiting groove is recessed inward on the bottom surface of the base. The first pin connector and the second pin connector are installed at opposite ends of the limiting groove. The spring contact is electrically connected to the first pin connector at one end, and a movable contact is provided at the other end of the spring contact to movably contact the positioning contact of the second pin connector. The positioning contact is located below the movable contact. When the coil assembly is not energized and the movable iron core is not moving upward, the upper and lower magnetic actuators are magnetically attracted to each other. At this time, the attraction force is greater than the spring force of the spring, causing the lower magnetic actuator to pull the spring part, making the end of the spring with the movable contact move away from the positioning contact and deform and store elastic force. After the coil assembly is energized and the movable iron core moves upward, the distance between the upper and lower magnetic actuators increases, and the magnetic attraction force decreases with the increase of distance. When the force is less than the spring force of the spring, the end of the spring with the movable contact contacts the positioning contact.

7. The magnetic switch structure of the relay according to claim 6, characterized in that, The switching assembly further includes a base, a first pin connector, a second pin connector, and a spring contact. The base is installed inside the relay and abuts against the bottom surface of the coil assembly. A limiting groove is recessed inward on the bottom surface of the base. The first pin connector and the second pin connector are installed at opposite ends of the limiting groove. The spring contact is electrically connected to the first pin connector at one end, and a movable contact is provided at the other end of the spring contact to movably contact the positioning contact of the second pin connector. The positioning contact is located above the movable contact. When the coil assembly is not energized and the movable iron core is not moving upward, there is a magnetic attraction between the upper and lower magnetic actuators. At this time, the attraction causes the spring to deform upward and store energy, so that the lower magnetic actuator pulls the spring, causing the end of the spring with the movable contact to contact the positioning contact. After the coil assembly is energized and the movable iron core moves upward, the distance between the upper and lower magnetic actuators increases, and the magnetic attraction decreases with the increase of distance. When the force is less than the stored energy of the spring, the spring springs back to its original position and moves away from the positioning contact with the end with the movable contact.

8. The magnetic switch structure of the relay according to any one of claims 6 to 7, characterized in that, The lower magnetic actuation assembly further includes a lower magnet and a lower support. The lower support is further provided with a mounting groove and a protrusion at opposite ends. The lower magnet is installed in the mounting groove, and the protrusion is normally in contact with the spring piece. The protrusion further includes an upper protrusion, a lower protrusion, and a connecting portion connecting the upper protrusion and the lower protrusion. A clamping gap is formed between the upper protrusion, the lower protrusion, and the connecting portion, and the spring piece is clamped in the clamping gap.

9. The magnetic switch structure of the relay according to claim 8, characterized in that, The upper magnetic actuator further includes an upper magnet and a movable seat. The movable seat is fitted onto the end of the movable iron core, and an assembly groove is recessed on the side of the movable seat corresponding to the lower magnetic actuator. The upper magnet is installed in the assembly groove. When the coil assembly is energized and generates an electromagnetic field, the movable iron core moves upward and drives the movable seat to move together. The movement of the movable seat will also drive the upper magnet away from the lower magnet, thereby increasing the distance and reducing the magnetic attraction force.

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