Self-locking battery lock mechanism

Abstract

This utility model relates to a self-locking battery locking mechanism, which addresses the technical problem of existing similar products where the locking hooks and corresponding components on both sides of the sheet metal bracket are difficult to integrate and disassemble, and lack a limiting plate as an intermediate component to support the locking hooks. The battery locking mechanism has locking hooks symmetrically arranged on both sides of the inner diameter of the sheet metal bracket, with switch levers on the inner sides of each locking hook. The moving iron core of an electromagnet is connected to the middle of the connecting plate on the inner rear side of the sheet metal bracket, and push rods are provided on both sides of the outer diameter of the sheet metal bracket. The key point is that one end of each locking hook on both sides of the inner diameter of the sheet metal bracket is connected to both ends of the connecting plate on the inner rear side of the sheet metal bracket via limiting plates. The limiting plates are fixed to the connecting plate on both sides of the rear side of the sheet metal bracket by second screws. While swinging, one end of each limiting plate abuts against the rocker arm at the tail of the other end of the locking hook on the inner side of the sheet metal bracket, and the other end of each limiting plate abuts against both ends of the connecting plate on the rear side of the sheet metal bracket. A torsion spring is provided at the second screw to facilitate the reset of the limiting plates.

Description

Technical Field

[0001] This utility model relates to a lock for batteries in a shared charging cabinet, which is a self-locking battery locking mechanism. Background Technology

[0002] Shared battery swapping cabinets, also known as shared new energy battery cabinets, are centralized, unattended intelligent cabinet-style devices that store multiple fully charged standardized lithium batteries. Users can scan a QR code via a mobile app or mini-program to retrieve a fully charged battery and return the depleted battery from their vehicle, enabling quick battery replacement and alleviating range anxiety. Simultaneously, they solve the range and charging problems of urban light electric vehicles, making them popular with frequent users such as food delivery and courier services. With technological maturity, market expansion, and policy support, they are expected to become an important component of new urban infrastructure, with huge future development potential. For example, Chinese patent application number 202320518841.6, authorized on August 1, 2023, with the utility model name "Reliable Multi-Compartment Battery Swapping Cabinet," is disclosed in Chinese patent literature. However, the aforementioned products and similar products rarely use a rear-mounted external electromagnet (solenoid valve) to achieve the swing unlocking of the locking hook, or the simultaneous unlocking of the rear dual locking bodies. In particular, they rarely use a rear sheet metal bracket to integrate and disassemble the locking bodies on both sides, the locking hook, and corresponding components. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a self-locking battery locking mechanism in the field, which solves the problems of existing similar products rarely using a rear external electromagnet (solenoid valve) to achieve simultaneous swing unlocking of the locking hooks of the two locking bodies on both sides, and rarely using a rear sheet metal bracket to achieve integrated assembly and disassembly of the two locking bodies, locking hooks and corresponding components, especially lacking a limiting piece as an intermediate component to support the locking hook. This objective is achieved through the following technical solution.

[0004] A self-locking battery locking mechanism is disclosed, wherein a sheet metal bracket is disposed at the rear of the battery compartment shell inside a charging cabinet. The sheet metal bracket has symmetrically arranged locking hooks on both sides of its inner diameter, which are unlocked by swinging or locked by impact. One end of each hook extends out of the front of the sheet metal bracket and simultaneously enters a through hole at the rear of the battery compartment shell, engaging with a locking shaft on one side of the battery end shell at the rear of the battery. The key structural design feature is that the sheet metal bracket is a plate formed by symmetrical bending and stamping from a protruding "[" shape at the rear of the battery compartment shell. The other ends of the locking hooks on both sides of the inner diameter of the sheet metal bracket are connected to both ends of a connecting plate at the rear of the sheet metal bracket via limiting plates. The limiting plates are respectively fixed to the connecting plate at the rear of the sheet metal bracket by second screws. While the connecting plate swings on both sides, one end of the limiting plate is connected to the rocker post at the other end of the locking hook inside the sheet metal bracket, and the other end of the limiting plate is abutted against both ends of the connecting plate at the rear of the sheet metal bracket. A torsion spring is provided at the second screw to facilitate the reset of the limiting plate. The middle of the connecting plate is connected to the moving iron core of the electromagnet. The electromagnet is fixedly installed on the inner rear side of the sheet metal bracket. One side of the hook of the locking hook is hinged and fixed to the swinging sides of the inner diameter of the sheet metal bracket by the first screw. One end of the second tension spring at the tail of the locking hook on one side of the connecting plate is connected to the second tension spring post inside the locking hook, and the other end of the second tension spring is connected to the first tension spring post inside the sheet metal bracket. The outer diameter of the locking hook of the sheet metal bracket is provided with a push rod and a spring abutting against the push rod. The first tension spring post, limiting ear, limiting plate, guide ear, spring sheet, and corresponding mounting positions, post positions, hole positions and through holes of the above-mentioned sheet metal bracket are formed by stamping of sheet metal. Among them, the four mounting ears of the sheet metal bracket facing the rear of the battery compartment shell are respectively the front end of the side of the side that is bent and stamped on both sides, and the other side of the symmetrical rear end is bent and stamped to form a spring sheet facing the mounting ear in the middle. While the spring sheets are formed on both sides of the sheet metal bracket, the ends are wedge-connected to each other. The guide ears that protrude outward on both sides of the sheet metal bracket are the side plates that are bent and stamped outward on the sheet metal bracket. The first tension spring post, limiting ear, limiting plate and the locking plate used to fix the limiting lock hook are all stamped and bent plates. The aforementioned connecting plates are configured as follows: each is in a straight line shape, with both ends bent downwards and stamped to abut against one end of the limiting plate; alternatively, the connecting plates can be connecting plates for the first and second connecting rods, with one end of the first connecting rod simultaneously hinged to the moving iron core of the electromagnet, and the other end of the first connecting rod hinged to one end of the second connecting rod. The other end of the second connecting rod abuts against one end of the limiting plate via a pin. The connection points of the first connecting rod, the second connecting rod, and the pin are respectively inserted into the corresponding grooves of the sheet metal bracket. The sheet metal bracket side of the rotating end of the limiting plate is provided with a stamped and bent limiting post as needed, while the other rotating end of the limiting plate is limited to the inner diameter of both sides of the sheet metal bracket.

[0005] The hook portion has a 70-degree downward-facing locking shaft inlet. Above the inlet opening, there are chamfered edges and chamfered heads with a downward angle of less than 10 degrees. Below the inlet opening, there are two downward-facing triangular openings, one parallel to the hook opening and at a 60-degree angle. The opening end of one side of the triangular opening is higher than the opening end of the chamfered head on the other side. The opening end of one side of the triangular opening is lower than the opening end of the symmetrical other side. The chamfered head, the inlet opening, and the inner side of the triangular opening increase in size sequentially. The above-described locking hook is a specific structural embodiment of an irregularly shaped locking hook.

[0006] The second screws of the limiting plate are respectively located on the inner back of the sheet metal bracket on the electromagnet side below the connecting plate, and close to both sides of the sheet metal bracket. The angle between the two ends of the limiting plate and the connecting plate and the locking hook is 90 degrees. One end of the locking hook of the limiting plate is lower than the other end of the connecting plate and is L-shaped. One end of the locking hook of the limiting plate protrudes near the second screw. The above is a specific structural embodiment of the limiting plate.

[0007] The direction of extension and retraction of the moving iron core of the electromagnet, and the connecting plate is located at the lower rear or upper part of the battery compartment shell. The edge of the sheet metal bracket above the corresponding connecting plate is provided with a bending and limiting ear that limits the outward movement of the connecting plate.

[0008] The outer diameter of the first screw of the lock hook is provided with a protruding edge, and at least one side of the sheet metal bracket above or below the protruding edge is provided with a limiting plate to limit the swing amplitude of the lock hook.

[0009] One end of the locking hook passes through the sliding hole on the back of the sheet metal bracket. The sliding hole is provided with a corresponding sliding hole and fixedly installed on the reinforcing plate of the sheet metal bracket. The tail of the locking hook passes through the plate hole of the reinforcing plate.

[0010] The inner side of the first screw of the locking hook is provided with a switch lever that fits the locking hook and is simultaneously fixed to the inner side of the sheet metal bracket by one end of the screw. The first screw and the other end of the switch lever are each provided with a latching post that is tightly fixed to the locking hook, and the switch lever and the locking hook are integrated. At the hinge point of the first screw at one end of the switch lever, one end of the first tension spring is respectively connected to the third tension spring post of the switch lever, and the other end of the first tension spring is respectively connected to the fourth tension spring post of the locking hook or the switch housing. The other end of the switch lever extends beyond the bottom groove of the opening at the hook portion of the locking hook. At least the lug on the roller at the end of the first screw of the switch lever or on one side of the outer diameter of the switch lever aligns with or abuts against the moving spring of the microswitch provided on the locking hook. The roller at the first screw or the lug on one side of the switch lever can be provided as needed to trigger the microswitch when the locking hook and the switch lever rotate.

[0011] The micro switch is mounted on one side of the lock hook via a switch housing. The moving spring of the micro switch extends out of the opening on one side of the switch housing, and the switch housing is fixedly mounted on one side of the lock hook.

[0012] The back of the sheet metal bracket at the connecting plate is symmetrically provided with sliding groove plates fixedly installed on both sides of the sheet metal bracket. The edges of the connecting plate are respectively raised and embedded in the sliding groove of the sliding groove plate for vertical positioning and sliding.

[0013] The push rods are T-shaped, with the T-shaped end on one side of the battery compartment shell. One end of the push rod extends out of the sheet metal bracket and abuts against the rear of the battery inside the battery compartment shell. The other end of the push rod passes through the through holes of the guide ears symmetrically arranged on both sides of the sheet metal bracket and abuts against one end of the spring. The other end of the spring is fixed to the spring plates on both sides of the outer diameter of the sheet metal bracket. Simultaneously, the push rods are fixed to the guide ears on the front side of the sheet metal bracket by limiting components on one side of the outer diameter. The push rods are limited by pins in the through holes of the guide ears on both sides of the sheet metal bracket and the abutting springs for reciprocating movement. However, the limiting components for the extension and retraction of the push rods are not limited to pins; pins, snap rings, limiting sleeves, etc., can also be used. The guide ears on one side of the sheet metal bracket are symmetrically arranged front and back or arranged individually, as long as they can stably move the push rods back and forth. The hinged fixing of the locking hooks is not limited to screws; rivets or pins can be used to allow the locking hooks to swing.

[0014] This utility model has a reasonable structural design, is easy to assemble and install, simple to monitor, and has good stability. In particular, the double-lock body structure on both sides is easy to install and remove simultaneously through the sheet metal bracket, and has a high degree of overall integration and good linkage effect of the lock hook. It is suitable for use as a self-locking battery locking mechanism and a structural improvement of similar products. Attached Figure Description

[0015] Figure 1 This is a partial exploded structural diagram of an embodiment of this utility model.

[0016] Figure 2 yes Figure 1 A schematic diagram of the assembled three-dimensional structure.

[0017] Figure 3 yes Figure 2 A partial structural diagram is shown. The first tension spring, the second tension spring, and the switch cover on one side are omitted in the diagram. The dashed lines represent the switch lever and the locking shaft.

[0018] Figure 4 yes Figure 3 A magnified schematic diagram of the locking hook and switch lever.

[0019] Figure 5 yes Figure 3 Enlarged structural diagram of the other side of the locking hook and switch lever from the main view side.

[0020] Figure 6yes Figure 2 A schematic diagram of the rear front side structure.

[0021] Figure 7 yes Figure 2 A schematic diagram of the usage state structure.

[0022] Attached Figure Numbers and Names: 1. Sheet Metal Bracket, 101. First Tension Spring Column, 102. Limiting Ear, 103. Limiting Plate, 104. Guide Ear, 105. Spring Plate, 2. Electromagnet, 3. Connecting Plate, 4. Lock Hook, 401. Hook Part, 402. Rocker Column, 403. Second Tension Spring Column, 5. Micro Switch, 6. Switch Paddle, 601. Snap Column, 602. Third Tension Spring Column, 7. Pin, 8. Push Rod, 9. Spring, 10. First Tension Spring, 11. Switch Cover, 12. Second Tension Spring, 13. First Screw, 14. Second Screw, 15. Limiting Plate, 16. Torsion Spring, 17. Reinforcing Plate, 18. Slide Plate, 19. Locking Shaft, 20. Battery Compartment Shell. Implementation

[0023] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-7 As shown, the sheet metal bracket 1 of the battery locking mechanism is located at the rear of the battery compartment shell 20 inside the charging cabinet. The inner diameter of the sheet metal bracket is symmetrically provided with locking hooks 4 on both sides, which can be unlocked by swinging or locked by collision. The hook portion 401 at one end of each hook extends out from the front of the sheet metal bracket and simultaneously enters the through hole at the rear of the battery compartment shell, engaging with the locking shaft 19 on one side of the battery end shell at the rear of the battery compartment shell. The sheet metal bracket is a plate formed by symmetrical bending and stamping of the rear of the battery compartment shell. The other ends of the locking hooks on both sides of the inner diameter of the sheet metal bracket are connected to both ends of the connecting plate 3 at the rear of the sheet metal bracket via limiting plates 15. The limiting plates on both sides are fixed to the connecting plate at the rear of the sheet metal bracket by second screws 14. While swinging, one end of the limiting plate engages with the rocker arm 402 at the tail of the other end of the locking hook on the inner side of the sheet metal bracket, and the other end of the limiting plate abuts against both ends of the connecting plate at the rear of the sheet metal bracket. The second screw is provided with a mechanism for facilitating the locking mechanism. The torsion spring 16 for resetting the position plate is connected to the moving iron core of the electromagnet 2 in the middle of the connecting plate. The electromagnet is fixedly installed on the inner rear side of the sheet metal bracket. The hook part 401 of the lock is hinged to both sides of the inner diameter of the sheet metal bracket by the first screw 13. One end of the second tension spring 12 at the tail of the lock on one side of the connecting plate is connected to the second tension spring post 403 on the inner side of the lock. The other end of the second tension spring is connected to the first tension spring post 101 on the inner side of the sheet metal bracket. The outer diameter of the lock on the sheet metal bracket is provided with a push rod 8 and a spring 9 abutting against the push rod.

[0024] The hook portion of the aforementioned lock has a 70-degree downward-facing locking shaft inlet. Above the inlet opening, there are chamfered edges and chamfered heads with a downward angle of less than 10 degrees. Below the inlet opening, there are two downward-facing triangular openings, one parallel to the hook opening and at a 60-degree angle. The opening end of one side of the triangular opening is higher than the opening end of the chamfered head on the other side. The opening end of one side of the triangular opening is lower than the opening end of the symmetrical other side. The chamfered head, the inlet opening, and the inner side of the triangular opening of the lock hook increase in size sequentially. The second screws of the limiting plates are respectively located on the inner back of the sheet metal bracket on the electromagnet side below the connecting plate, close to both sides of the sheet metal bracket. The angle between the limiting plates and the two ends of the connecting plate and the lock hook is 90 degrees. One end of the locking hook of the limiting plate is lower than the end of the connecting plate, forming an L-shape. One end of the locking hook of the limiting plate protrudes near the second screw. The direction of extension and retraction of the moving iron core of the electromagnet, and the connecting plate is located at the lower rear or upper part of the battery compartment shell. The edge of the sheet metal bracket above the corresponding connecting plate is provided with a bent and shaped limiting ear 102 that limits the outward movement of the connecting plate.

[0025] The first screw of the aforementioned locking hook has a protruding edge on one side of its outer diameter. At least one side of the sheet metal bracket above or below the protruding edge is provided with a limiting plate 103 to limit the swing amplitude of the locking hook. One end of the tail of the locking hook passes through a sliding hole on the back of the sheet metal bracket. The sliding hole is provided with a corresponding reinforcing plate 17 fixedly mounted on the sheet metal bracket. The tail of the locking hook passes through the plate hole of the reinforcing plate. The inner side of the first screw of the lock hook is provided with a switch lever 6 that fits the lock hook and is simultaneously fixed to the inner side of the sheet metal bracket by the screw at one end. The first screw of the switch lever and the other end are provided with at least one snap-fit ​​post 601 that is tightly fixed to the lock hook. The switch lever and the lock hook are integrated. One end of the first tension spring at the hinge of the first screw of the switch lever is respectively connected to the third tension spring post 602 of the switch lever. The other end of the first tension spring is respectively connected to the fourth tension spring post of the lock hook or the switch cover 11. The other end of the switch lever is convenient to be inserted into the bottom groove of the opening at the hook part of the lock hook. At least the lug on the roller at the end of the first screw of the switch lever or the outer diameter edge of the switch lever is aligned or abutted with the moving spring of the micro switch 5 provided on the lock hook. The micro switch is provided on one side of the lock hook through the switch cover. The moving spring of the micro switch extends out of the opening on one side of the switch cover. The switch cover is fixedly provided on one side of the lock hook.

[0026] The sheet metal bracket at the aforementioned connecting plate has symmetrically arranged sliding groove plates 18 fixedly mounted on both sides of its back. The edges of the connecting plates protrude and are embedded in the sliding grooves of the sliding groove plates for vertical positioning and sliding. The top rods are T-shaped, with the top rod end on the battery compartment shell side being a T-shaped end. One end of the top rod extends out of the sheet metal bracket and abuts against the rear of the battery inside the battery compartment shell. The other end of the top rod passes through the through holes of the guide ears 104 symmetrically arranged on both sides of the sheet metal bracket and abuts against one end of the spring. The other end of the spring is fixed to the spring plates 105 on both sides of the outer diameter of the sheet metal bracket. At the same time, the top rods are fixed in the guide ears on the front side of the sheet metal bracket by the limiting members on the outer diameter side and move accordingly.

[0027] The battery locking mechanism has a normally open locking hook. When the locking shaft engages, the switch lever rotates backward and presses the microswitch. At this time, the microswitch sends a signal to the power cabinet indicating that the locking shaft is in position. The tail of the locking hook springs up, and the limiting plate is pulled back and supported by the torsion spring. When unlocking, the electromagnet pulls the connecting piece and the limiting plate rotates. The locking hook loses the support of the limiting plate and unlocks under the action of the corresponding tension spring. The battery is pushed out by the push rod and the spring, allowing the battery to be pulled out.

[0028] In summary, the locking hook of this battery locking mechanism does not directly lock the battery's locking shaft. Instead, it relies on an electromagnet and a limiting plate to drive the hook in a coordinated manner to achieve locking. However, when the battery is pulled outwards with force, it will not be pulled out due to the locking hook. As long as the limiting plate holds the hook in place, the hook will not fail. Furthermore, the head of the locking hook is angled, resulting in lower locking and unlocking forces.

Claims

1. A self-locking battery locking mechanism for a charging cabinet, wherein a sheet metal bracket (1) of the battery locking mechanism is disposed at the rear of the battery compartment shell (20) inside the charging cabinet, and symmetrically provided on both sides of the inner diameter of the sheet metal bracket are locking hooks (4) that are unlocked by swinging or locked by collision, and the hook part (401) at one end of the locking hook extends out of the front of the sheet metal bracket and simultaneously extends into the through hole at the rear of the battery compartment shell to engage with the locking shaft (19) on one side of the battery end shell at the rear of the battery inside the battery compartment shell; characterized in that The sheet metal bracket (1) is a plate formed by symmetrical bending and stamping of the rear part of the battery compartment shell (20) in the shape of a "[". The other ends of the locking hooks (4) on both sides of the inner diameter of the sheet metal bracket are connected to the two ends of the connecting plate (3) at the rear of the sheet metal bracket through limiting plates (15). The two limiting plates are fixed to the two sides of the connecting plate at the rear of the sheet metal bracket by the second screws (14). While swinging, one end of the limiting plate is respectively connected to the rocker post (402) at the tail of the other end of the locking hook on the inner side of the sheet metal bracket, and the other end of the limiting plate is respectively abutted against the two ends of the connecting plate at the rear of the sheet metal bracket. The second screw is provided with a means to limit The torsion spring (16) for resetting the position plate is connected to the moving iron core of the electromagnet (2) in the middle of the connecting plate. The electromagnet is fixedly installed on the inner side of the rear of the sheet metal bracket. The hook (401) of the lock is hinged to the inner diameter of the sheet metal bracket by the first screw (13) on one side. The second tension spring (12) at the tail of the lock on one side of the connecting plate is connected to the second tension spring column (403) on the inner side of the lock. The other end of the second tension spring is connected to the first tension spring column (101) on the inner side of the sheet metal bracket. The outer diameter of the lock on the sheet metal bracket is provided with a top rod (8) and a spring (9) abutting against the top rod.

2. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The hook (401) of the lock hook (4) has a 70-degree downward locking shaft (19) inlet opening. Above the inlet opening of the hook, there are chamfered edges and chamfered heads with a downward angle of less than 10 degrees. Below the inlet opening of the hook, there are downward triangular openings with one side parallel to the hook opening and a 60-degree angle. The opening end of one side of the triangular opening is higher than the opening end of the chamfered head on the other side. The opening end of one side of the triangular opening is lower than the opening end of the other side. The chamfered head, the inlet opening, and the inner side of the triangular opening of the lock hook are arranged to increase in size in sequence.

3. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The second screw (14) of the limiting piece (15) is respectively set on the inner side of the back of the sheet metal bracket (1) on the side of the electromagnet (2) below the connecting plate (3), and close to both sides of the sheet metal bracket. The angle between the two ends of the limiting piece and the connecting plate and the locking hook (4) is 90 degrees. One end of the locking hook of the limiting piece is lower than one end of the connecting plate and is L-shaped. One end of the locking hook of the limiting piece protrudes close to the second screw.

4. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The moving iron core of the electromagnet (2) extends in the direction of extension and retraction, and the connecting plate (3) is located below or above the rear of the battery compartment shell (20). The corresponding connecting plate is provided with a bending and limiting ear (102) at the edge of the sheet metal bracket (1) above it, which limits the outward movement of the connecting plate.

5. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The outer diameter of the first screw (13) of the lock hook (4) is provided with a protruding edge, and the sheet metal bracket (1) above or below the protruding edge is provided with a limiting plate (103) on at least one side to limit the swing amplitude of the lock hook.

6. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... One end of the tail of the locking hook (4) passes through the sliding hole on the back of the sheet metal bracket (1). The sliding hole is provided with a corresponding sliding hole and fixedly installed on the reinforcing plate (17) of the sheet metal bracket. The tail of the locking hook passes through the plate hole of the reinforcing plate.

7. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The inner side of the first screw (13) of the lock hook (4) is provided with a switch plate (6) that fits the lock hook and is fixed to the inner side of the sheet metal bracket (1) by the screw at one end. The first screw of the switch plate and the other end are provided with at least one buckle post (601) that is tightly fixed to the lock hook. The switch plate and the lock hook are connected as one unit. One end of the first tension spring (10) at the hinge of the first screw of the switch plate is respectively connected to the third tension spring post (602) of the switch plate. The other end of the first tension spring is respectively connected to the fourth tension spring post of the lock hook or the switch cover (11). The other end of the switch plate is convenient to be introduced into the bottom groove of the opening at the hook part (401) of the lock hook. At least the lug on the edge of the first screw end roller of the switch plate or the outer diameter of the switch plate is aligned or abutted with the moving spring of the micro switch (5) provided on the lock hook.

8. The self-locking battery locking mechanism for the charging cabinet according to claim 7, characterized in that... The micro switch (5) is mounted on one side of the lock hook (4) through a switch cover (11). The moving spring of the micro switch extends out of the opening on one side of the switch cover, and the switch cover is fixedly mounted on one side of the lock hook.

9. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The back of the sheet metal bracket (1) at the connecting plate (3) is symmetrically provided with sliding groove plates (18) fixedly installed on the sheet metal bracket. The edges of the connecting plate are respectively raised and embedded in the sliding groove of the sliding groove plate for vertical positioning and sliding.

10. The self-locking battery locking mechanism for the charging cabinet according to claim 1, characterized in that... The top rods (8) are T-shaped. The top rod end on one side of the battery compartment shell (20) is a T-shaped end. One end of the top rod extends out of the sheet metal bracket (1) and abuts against the rear of the battery in the battery compartment shell. The other end of the top rod passes through the through holes of the guide ears (104) symmetrically arranged on both sides of the sheet metal bracket and abuts against one end of the spring (9). The other end of the spring is fixed to the spring plates (105) on both sides of the outer diameter of the sheet metal bracket. At the same time, the top rod moves in the guide ears on the front side of the sheet metal bracket by the limiting member on one side of the outer diameter.

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