Indoor passive electromagnetic lock

Abstract

This invention relates to the field of electromagnetic lock technology, specifically to an indoor passive electromagnetic lock, comprising a lock body and an electronic key box. The lock body contains a latch, and a control panel is located on one side of the lock body. The control panel includes a storage slot located above the electronic key box, with an insert at its upper end. A mating groove is provided on the control panel corresponding to the insert, allowing power to be supplied to the lock body when no power source is available. A damping element is located inside the mating groove, limiting the insertion of the insert. A lowering groove is located above the mating groove, with a sealing element movably disposed inside to seal the mating groove. This invention, through the insertion element and mating groove within the indoor passive electromagnetic lock, facilitates electrical connection between the electronic key box and the control panel, enabling external power supply when no power source is available, and ensuring normal operation of the control panel.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic locks, and in particular to an indoor passive electromagnetic lock. Background Technology

[0002] An electromagnetic lock is an electric lock that relies on the attraction between an electromagnet and an iron block to close a door. It utilizes the principle of electromagnetism to unlock the door. To ensure the safe operation of high-voltage electrical equipment, prevent accidental entry into energized areas, and improve anti-misoperation capabilities, electromagnetic locks are installed on the front and rear doors of various high-voltage switchgear and other locations requiring forced locking. These electromagnetic locks are used in conjunction with voltage sensors in high-voltage electrical equipment to effectively prevent operator error or illegal intrusion, thereby ensuring the safety and stability of the entire system.

[0003] In use, the electromagnetic lock is connected to the voltage sensor of the high-voltage electrical equipment. When the high-voltage equipment is energized, the voltage sensor detects the presence of voltage and transmits a signal to the electromagnetic lock, energizing it and preventing the door from being opened. This forced interlocking measure effectively prevents operators from accidentally entering energized areas, ensuring their safety. At the same time, the use of the electromagnetic lock also improves the anti-misoperation performance of the high-voltage electrical equipment, preventing equipment damage and safety accidents caused by misoperation.

[0004] When the electromagnetic lock loses its power supply, it cannot be unlocked normally and requires mechanical unlocking with an emergency unlocking key. However, mechanical unlocking cannot receive or detect the voltage inside high-voltage electrical equipment. This means that when an economical unlocking key is needed to unlock the equipment when there is no power supply, workers may accidentally enter the high-voltage electrical equipment while it is operating at high voltage, which could easily cause a safety accident. Therefore, further improvements and optimizations are needed. Summary of the Invention

[0005] The purpose of this invention is to provide an indoor passive electromagnetic lock to solve the problem mentioned in the background art that mechanical unlocking cannot receive and detect the voltage status inside high-voltage electrical equipment. This causes the problem that when an emergency unlocking key is needed to unlock the equipment when there is no working power, workers may accidentally enter the high-voltage electrical equipment while it is operating at high voltage, which may easily lead to safety accidents.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an indoor passive electromagnetic lock, comprising a lock body and an electronic key box, wherein a bolt is provided inside the lock body, and a control panel is provided on one side of the lock body.

[0007] The storage slot is located at the top of the electronic key box. An insert is provided at the top of the storage slot. The control panel is provided with a docking slot corresponding to the insert. The insert and the docking slot are used to connect the lock body to power when there is no working power.

[0008] The damping element is located inside the mating groove and is used to limit the insertion of the insert.

[0009] The lower sliding groove is located at the upper end of the docking groove. A sealing component is movably installed inside the lower sliding groove to seal the docking groove.

[0010] The movable groove is located inside the insert, and a contact element is movably disposed inside the movable groove. The contact element is used to connect the insert to the lock body.

[0011] Preferably, the storage slot is equipped with a wire that is electrically connected to the electronic key box, and a connector is fixedly connected to the upper end of the wire. The size of the connector is adapted to the storage slot.

[0012] Preferably, an insert is fixedly connected to one side of the connector, the insert is electrically connected to the wire, and the insert is configured as a columnar structure.

[0013] Preferably, the docking groove is a horizontal columnar groove, and a conductive element is installed inside the docking groove. The conductive element is electrically connected to the control panel. The damping element is an annular rubber damping ring with a semi-circular cross-section. A damping groove is provided on the outside of the insert corresponding to the damping element. The damping groove is an annular groove with a semi-circular cross-section, and the size of the damping groove is adapted to the damping element.

[0014] Preferably, the lower moving groove is configured as an inclined vertical groove, the bottom of the lower moving groove is connected to the docking groove, an elastic element is fixedly installed inside the lower moving groove, a sealing element is fixedly connected to the bottom of the elastic element, the bottom of the sealing element passes through the lower moving groove and extends into the docking groove, the bottom of the sealing element is located on the other side of the damping element, and a pressing part is provided on one side of the bottom of the sealing element, the pressing part is configured as an inclined pushing surface.

[0015] Preferably, guide grooves are provided on both sides of the lower displacement groove. The guide grooves are inclined vertical grooves and are connected to the lower displacement groove on the inner side. The sealing member is provided with extrusion parts on both sides corresponding to the guide grooves. The extrusion parts are located inside the guide grooves. Guide members are movably sleeved on the outer side of the extrusion parts. The guide members are set as annular structures and the size of the guide members is adapted to the width of the guide groove.

[0016] Preferably, an extrusion member is integrally formed on one side of the insert, and the extrusion member is a conical member.

[0017] Preferably, the movable groove is a horizontal groove, with inserts penetrating both the upper and lower ends of the movable groove, and a stop part is provided on the upper end of one side of the movable groove, with the stop part being an inclined stop surface.

[0018] Preferably, the contact is configured as a horizontal block, the contact is made of conductive metal, both sides of the contact are in contact with the inner wall of the insert, one side of the contact is configured as a semicircle, the other side of the contact is configured as inclined planes at the top and bottom, the end where the two sets of inclined planes intersect is configured as a semicircle, and an insulating layer is fixedly installed on the upper end of the contact, the insulating layer is configured as an insulating gasket.

[0019] Preferably, a rotating groove is provided in the middle of the other side of the contact member. The rotating groove is a horizontal columnar groove. The contact member is penetrated on both sides of the rotating groove. A fixed shaft is provided inside the rotating groove. The side walls of the insert are fixedly connected to both sides of the fixed shaft. One end of a torsion spring is sleeved on the outside of the fixed shaft. The contact member is fixedly connected to the other side of the torsion spring.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention proposes an indoor passive electromagnetic lock with an insert and docking slot that facilitates electrical connection between the electronic key box and the control panel. This allows for external power supply when there is no working power, ensuring the normal operation of the electromagnetic lock control panel. When unlocking is required, the bolt retracts into the lock body, eliminating the need for mechanical unlocking with an emergency unlocking key after the electromagnetic lock loses power. Simultaneously, the internal control circuit prevents unlocking and issues a high-voltage alarm when a high-voltage signal is present, preventing accidental entry of personnel into high-voltage electrical equipment and avoiding potential safety incidents.

[0022] The sealing component can be used to seal the docking slot when the electronic key box is not powered, preventing external dust from entering the docking slot and causing poor contact during subsequent power supply. At the same time, the damping component can help remove external dust from the insert when it is inserted into the docking slot, preventing dust from entering the docking slot with the insert and affecting the power supply quality of the electronic key box. In addition, the damping component, together with the damping groove, can help to restrict the insert and prevent it from moving when the storage slot is powered.

[0023] By using the elastic element and the sealing element, the contact element can be pressed down after the insert is inserted into the mating groove, so that the contact element makes contact with the conductive element. This avoids the situation where the storage groove cannot be used due to poor contact between the insert and the conductive element after repeated use. The torsion spring can be used to easily reset the contact element into the movable groove when the insert is not in use. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2This is a schematic diagram of the electronic key box structure of the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the control panel structure of the present invention;

[0028] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0029] Figure 5 This is a schematic diagram of the sealing component structure of the present invention;

[0030] Figure 6 This is a cross-sectional schematic diagram of the insert of the present invention.

[0031] In the diagram: 1. Lock body; 2. Lock tongue; 3. Control panel; 4. Electronic key box; 5. Storage slot; 6. Wire; 7. Connector; 8. Insert; 9. Connecting slot; 10. Conductor; 11. Damping component; 12. Lowering slot; 13. Guide slot; 14. Elastic component; 15. Sealing component; 16. Pressing part; 17. Guide component; 18. Anti-jamming component; 19. Pressing part; 20. Movable slot; 21. Blocking part; 22. Contact component; 23. Insulation layer; 24. Fixed shaft; 25. Torsion spring; 26. Damping slot. Detailed Implementation

[0032] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0033] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0034] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two connected entities do not establish a connection relationship through an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0036] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Please see Figures 1 to 2 The present invention provides a technical solution: an indoor passive electromagnetic lock, including a lock body 1 and an electronic key box 4. The lock body 1 is provided with a lock tongue 2, which is used to lock high-voltage electrical equipment. A control panel 3 is provided on one side of the lock body 1. The control panel 3 is powered by a working power supply to realize the movement of the lock tongue 2, so as to facilitate the movement of the lock tongue 2 when it is necessary to open the high-voltage electrical equipment. At the same time, a power supply circuit and a battery are provided inside the electronic key box 4, and a color-changing indicator light is provided on the electronic key box 4.

[0038] When the high-voltage switchgear cabinet door needs to be opened in the absence of a high-voltage signal, insert the electronic key box 4; the green indicator light will illuminate. Press the red button; the red indicator light will illuminate. Keep the red light on. Lift the handle; turn the handle to the right to unlock the Y-type lock, and turn the handle to the left to unlock the Z-type lock. This allows the door to be unlocked even without power. If power is inserted when there is a high-voltage signal, the lock will automatically alarm and the door will be unable to be opened.

[0039] A storage slot 5 is provided at the upper end of the electronic key box 4. The storage slot 5 is a rectangular recess. A wire 6 is installed inside the storage slot 5. The wire 6 is electrically connected to the power supply circuit inside the electronic key box 4. A connector 7 is fixedly connected to the upper end of the wire 6. The size of the connector 7 is adapted to the storage slot 5. An insert 8 is fixedly connected to one side of the connector 7. The insert 8 is electrically connected to the wire 6. The insert 8 is designed as a columnar structure. If the connector 7 is exposed when the electronic key box 4 is not in use, it is easy to damage the insert 8, which will affect the power supply when in use. Therefore, when not in use, the connector 7 can be placed in the storage slot 5 for storage to avoid damage to the insert 8.

[0040] Please see Figures 3 to 5 Meanwhile, a docking groove 9 is provided on one side of the control panel 3. The docking groove 9 is a horizontal columnar groove. The size of the docking groove 9 is adapted to the insert 8. The docking groove 9, which is adapted to the insert 8, can facilitate the insertion of the insert 8 and facilitate the connection of the lock body 1 to the electronic key box 4 when there is no working power. A conductor 10 is installed inside the docking groove 9. The conductor 10 is electrically connected to the control panel 3. Through the electrical connection between the conductor 10 and the control panel 3, the electronic key box 4 can supply power to the various circuit systems in the control panel 3 after the insert 8 is inserted into the docking groove 9, so that the control panel 3 can resume operation and facilitate the normal use of the control panel 3. This avoids the situation where the electromagnetic lock can only be mechanically unlocked by using an emergency unlocking key after the electromagnetic lock loses its working power.

[0041] Furthermore, a damping element 11 is fixedly installed on the outside of the docking groove 9. The damping element 11 is a ring-shaped rubber damping ring with a semi-circular cross section. The ring-shaped damping element 11 can scrape off the dust on the outside of the insert 8 when it enters the docking groove 9, so as to avoid poor contact when the dust remains on the outside of the insert 8 and contacts the conductor 10. A damping groove 26 is provided on the outside of the insert 8 corresponding to the damping element 11. The damping groove 26 is a ring groove with a semi-circular cross section. The size of the damping groove 26 is adapted to the damping element 11. After the insert 8 is inserted into the docking groove 9, the damping groove 26 is engaged with the damping element 11 to limit the insertion 8 and prevent the insertion 8 from moving when the electronic key box 4 is powered, which would affect the normal use of the lock body 1.

[0042] Since the docking groove 9 is always open when not in use, external dust can easily enter the docking groove 9. Therefore, a downward groove 12 is provided at the upper end of the docking groove 9. The downward groove 12 is set as an inclined vertical groove. The bottom of the downward groove 12 is connected to the docking groove 9. An elastic element 14 is fixedly installed inside the downward groove 12. A sealing element 15 is fixedly connected to the bottom of the elastic element 14. The bottom of the sealing element 15 passes through the downward groove 12 and extends into the docking groove 9. The design of the sealing element 15 can facilitate the sealing of the docking groove 9 and prevent external dust from entering when the docking groove 9 is not in use. The bottom of the sealing element 15 is located on the other side of the damping element 11. A pressing part 16 is provided on one side of the bottom of the sealing element 15. The pressing part 16 is set as an inclined pushing surface. The sealing element 15 is movably arranged inside the downward groove 12. The inclined pressing part 16 can facilitate pushing the sealing element 15 upward and push the sealing element 15 away from the docking groove 9.

[0043] Guide grooves 13 are provided on both sides of the lower moving groove 12. The guide grooves 13 are inclined vertical grooves. The inner side of the guide grooves 13 is connected to the lower moving groove 12. The sealing member 15 is provided with extrusion parts 16 on both sides corresponding to the guide grooves 13. The extrusion parts 16 are located inside the guide grooves 13. The outer side of the extrusion parts 16 is movably fitted with guide members 17. The guide members 17 are designed with a ring structure. The size of the guide members 17 is adapted to the width of the guide grooves 13. By having the extrusion parts 16 located inside the guide grooves 13, the sealing member 15 can be easily guided when moving upward, avoiding the sealing member 15 from shifting upward. The ring-shaped design of the guide members 17 can effectively reduce the friction caused by the movement of the extrusion parts 16, thereby facilitating the upward movement of the sealing member 15 and avoiding the situation where the sealing member 15 gets stuck when moving upward, causing the insert 8 to be unable to be inserted into the docking groove 9.

[0044] An extrusion member 19 is integrally formed on one side of the insert 8. The extrusion member 19 is a conical member. The conical extrusion member 19 can easily extrude the sealing member 15 from the extrusion part 16, thereby pushing the sealing member 15 upward along the lower moving groove 12, so that the sealing member 15 leaves the docking groove 9 and no longer blocks the docking groove 9.

[0045] Please see Figure 6Because the insert 8 may deform after repeated use, gaps may appear in the contact between the insert 8 and the conductive element 10, leading to poor contact. Therefore, a movable groove 20 is provided inside the insert 8. The movable groove 20 is a horizontal groove, with both ends of the movable groove 20 penetrating the insert 8. A stop part 21 is provided on the upper end of one side of the movable groove 20. The stop part 21 is an inclined stop surface. The contact part 22 is a horizontal block-shaped part made of conductive metal. Both sides of the contact part 22 are in contact with the inner wall of the insert 8. When the insert 8 is inserted into the mating groove 9, the sealing element 15 is subjected to... The downward pressure of the elastic element 14 causes the sealing element 15 to press down on the contact element 22, causing one side of the contact element 22 to leave the movable groove 20, thus electrically connecting the insert 8 and the conductive element 10. One side of the contact element 22 is set as a semicircle, and the other side of the contact element 22 is set as an inclined plane both at the top and bottom. The end where the two sets of inclined planes intersect is set as a semicircle. An insulating layer 23 is fixedly installed on the upper end of the contact element 22. The insulating layer 23 is set as an insulating gasket. The setting of the insulating layer 23 can insulate the sealing element 15 and the contact element 22, preventing current from being conducted from the sealing element 15 and causing a short circuit. In addition, the insulating layer 23 can buffer the compression of the sealing element 15 and prevent scratches from appearing on the upper surface of the contact element 22.

[0046] Furthermore, a rotating groove is provided in the middle of the other side of the contact member 22. The rotating groove is a horizontal columnar groove, and the contact member 22 is penetrated on both sides of the rotating groove. A fixed shaft 24 is provided inside the rotating groove. The side walls of the insert member 8 are fixedly connected to both sides of the fixed shaft 24. One end of the torsion spring 25 is sleeved on the outside of the fixed shaft 24. The other side of the torsion spring 25 is fixedly connected to the contact member 22. By the torsion force of the torsion spring 25 itself, the contact member 22 can be reset when the insert member 8 leaves the docking groove 9.

[0047] In use, the connector 7 is first removed from the storage slot 5. The insert 8 on one side of the connector 7 is then inserted into the docking slot 9. The damping element 11 in the docking slot 9 scrapes away the dust on the outside of the insert 8. At the same time, the pressing element 19 on one side of the insert 8 contacts the pressing part 16. The pressing and sealing element 15 drives the pressing part 16 to move upward along the guide groove 13, so that the sealing element 15 no longer blocks the docking slot 9. When the insert 8 is fully inserted into the docking slot 9, the insert 8 and the conductive element 10 are in contact, and the control panel 3 can be powered through the electronic key box 4, which facilitates the normal use of the control panel 3. At the same time, the damping element 11 is inserted into the damping groove 26 to limit the insertion 8. Meanwhile, the elastic element 14 pushes the sealing element 15 downward through its own elasticity, so that the contact element 22 moves downward and contacts the conductive element 10, making the insert 8 contact the conductive element 10. This avoids the possibility of deformation of the insert 8 after multiple uses, which could lead to poor contact between the insert 8 and the conductive element 10.

[0048] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0049] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An indoor passive electromagnetic lock, comprising a lock body (1) and an electronic key box (4), wherein a latch (2) is provided inside the lock body (1), and a control panel (3) is provided on one side of the lock body (1), characterized in that: Storage slot (5) is located at the upper end of the electronic key box (4). An insert (8) is provided at the upper end of the storage slot (5). The control panel (3) is provided with a docking slot (9) corresponding to the insert (8). The insert (8) and the docking slot (9) are used to connect the lock body (1) to the power supply when there is no working power. Damping element (11) is located inside the docking groove (9) and is used to limit the insertion of the insert (8); The lower moving groove (12) is located at the upper end of the docking groove (9). A sealing component (15) is movably installed inside the lower moving groove (12) to seal the docking groove (9). The movable groove (20) is located inside the insert (8). A contact (22) is movably disposed inside the movable groove (20). The contact (22) is used to connect the insert (8) and the lock body (1).

2. The indoor passive electromagnetic lock according to claim 1, characterized in that: The storage slot (5) is equipped with a wire (6), which is electrically connected to the electronic key box (4). A connector (7) is fixedly connected to the upper end of the wire (6), and the size of the connector (7) is adapted to the storage slot (5).

3. The indoor passive electromagnetic lock according to claim 2, characterized in that: The connector (7) has an insert (8) fixedly connected to one side. The insert (8) is electrically connected to the wire (6). The insert (8) is configured as a columnar structure.

4. The indoor passive electromagnetic lock according to claim 3, characterized in that: The docking groove (9) is configured as a transverse columnar groove. A conductive element (10) is installed inside the docking groove (9). The conductive element (10) is electrically connected to the control panel (3). The damping element (11) is configured as an annular rubber damping ring with a semi-circular cross section. A damping groove (26) is provided on the outside of the insert (8) corresponding to the damping element (11). The damping groove (26) is configured as an annular groove with a semi-circular cross section. The size of the damping groove (26) is adapted to the damping element (11).

5. The indoor passive electromagnetic lock according to claim 4, characterized in that: The lower moving groove (12) is configured as an inclined vertical groove. The bottom of the lower moving groove (12) is connected to the docking groove (9). An elastic element (14) is fixedly installed inside the lower moving groove (12). A sealing element (15) is fixedly connected to the bottom of the elastic element (14). The bottom of the sealing element (15) passes through the lower moving groove (12) and extends into the docking groove (9). The bottom of the sealing element (15) is located on the other side of the damping element (11). A pressing part (16) is provided on one side of the bottom of the sealing element (15). The pressing part (16) is configured as an inclined pushing surface.

6. The indoor passive electromagnetic lock according to claim 5, characterized in that: The lowering groove (12) is provided with guide grooves (13) on both sides. The guide grooves (13) are inclined vertical grooves. The inner side of the guide grooves (13) is connected to the lowering groove (12). The sealing member (15) is provided with extrusion parts (16) on both sides corresponding to the guide grooves (13). The extrusion parts (16) are all located inside the guide grooves (13). The outer side of the extrusion parts (16) is movably fitted with guide members (17). The guide members (17) are set with a ring structure. The size of the guide members (17) is adapted to the width of the guide grooves (13).

7. The indoor passive electromagnetic lock according to claim 6, characterized in that: The insert (8) has an integrally formed extrusion part (19) on one side, and the extrusion part (19) is a conical part.

8. The indoor passive electromagnetic lock according to claim 7, characterized in that: The movable groove (20) is configured as a horizontal groove, and the insert (8) passes through both the upper and lower ends of the movable groove (20). A stop part (21) is provided on the upper end of one side of the movable groove (20), and the stop part (21) is configured as an inclined stop surface.

9. An indoor passive electromagnetic lock according to claim 8, characterized in that: The contact (22) is configured as a horizontal block, and the contact (22) is made of conductive metal. Both sides of the contact (22) are attached to the inner wall of the insert (8). One side of the contact (22) is configured as a semicircle, and the other side of the contact (22) is configured as an inclined plane. The end where the two sets of inclined planes intersect is configured as a semicircle. An insulating layer (23) is fixedly installed on the upper end of the contact (22). The insulating layer (23) is configured as a gasket of insulating material.

10. An indoor passive electromagnetic lock according to claim 9, characterized in that: A rotating groove is provided in the middle of the other side of the contact (22). The rotating groove is a horizontal columnar groove. The contact (22) is penetrated on both sides of the rotating groove. A fixed shaft (24) is provided inside the rotating groove. The side walls of the insert (8) are fixedly connected to both sides of the fixed shaft (24). One end of the torsion spring (25) is sleeved on the outside of the fixed shaft (24). The other side of the torsion spring (25) is fixedly connected to the contact (22).

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