Battery compartment lock

Abstract

The utility model discloses a battery compartment lock, include: casing, locking piece is connected with the casing rotation, and locking piece can rotate between first position and second position, lock hook is connected with the casing rotation, and lock hook can rotate between locking position and unlocking position, when locking piece is in first position, and hook up lock hook to restrict the rotation of lock hook to the unlocking direction, and when locking piece is in second position, and separate lock hook, drive mechanism, be provided with the guide surface on the lock hook, and the guide surface is the guide structure of the inclined setting in the front end surface of lock hook to the battery insertion direction, is used for when the lock rod of battery is pushed, and the lock hook is rotated to the locking position. Can realize the automatic locking when battery insertion, and the locking is reliable, and after unlocking, the battery is convenient to take out.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, specifically a battery compartment lock. Background Technology

[0002] Shared battery cabinets are now widely used by electric vehicle users who consume a lot of electricity daily. Because they involve sharing, it's necessary to improve battery storage security and reduce the possibility of theft. Therefore, battery cabinets typically include battery compartment locks to secure the batteries. This serves two purposes: firstly, to enhance security and prevent theft; and secondly, to ensure stable charging after locking. For example, in some battery compartments, simply inserting the battery automatically connects it to the charging port for charging. Without a lock, the charging port could become loose, leading to unstable charging and other problems. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a battery compartment lock that can automatically lock when the battery is inserted, ensure reliable locking, and facilitate the removal of the battery after unlocking.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A battery compartment lock, comprising: case; A locking element is rotatably connected to the housing, and the locking element is rotatable between a first position and a second position; A locking hook is rotatably connected to the housing, and the locking hook is rotatable between a locked position and an unlocked position; When the locking member is in the first position, it hooks the lock hook to restrict the lock hook from rotating in the unlocking direction; when the locking member is in the second position, it disengages from the lock hook. A drive mechanism, connected to the locking member, is used to drive the locking member to switch between the first position and the second position; A torsion spring, disposed between the locking hook and the housing, is used to provide a tendency for the locking hook to rotate toward the unlocked position; An elastic element, disposed within the housing and acting on the locking element, provides a tendency for the locking element to rotate toward the first position. When the locking hook is in the unlocked position, the locking element abuts against the surface of the locking hook. When the locking hook is rotated to the locked position, the locking element hooks the locking hook under the action of the elastic element. The locking hook is provided with a guide surface, which is a guide structure inclinedly disposed on the front end of the locking hook facing the battery insertion direction, and is used to drive the locking hook to rotate towards the locking position when pushed by the battery locking rod.

[0005] As a further improvement of this utility model, a trigger portion extends from the side of the locking member, and a first detection switch is provided in the housing on the moving path corresponding to the trigger portion. When the locking member is rotated to the second position, the trigger portion triggers the first detection switch.

[0006] As a further improvement of this utility model, the lock hook has a hook portion that extends outward to the outside of the housing, and the rotatable connection position of the lock hook and the housing is located in the direction of the extension path of the lock hook.

[0007] As a further improvement of this utility model, the driving mechanism includes an electromagnetic pull rod, which is connected to the locking member; the elastic member is a compression spring, which is sleeved on the electromagnetic pull rod.

[0008] As a further improvement of this utility model, the driving mechanism includes a motor and a slider, the slider is connected to the output shaft of the motor, the locking member is connected to the slider, and the motor drives the locking member to rotate through the slider.

[0009] As a further improvement of this utility model, the output shaft of the motor is a telescopic shaft, and a buffer spring is provided on the slider. The telescopic shaft is connected to the buffer spring. When the motor drives the telescopic shaft to retract, the slider is moved by the elastic force of the buffer spring.

[0010] As a further improvement of this utility model, the locking member extends outward from the end of the drive mechanism corresponding to the housing to form a manual toggle end.

[0011] As a further improvement of this utility model, a pop-out component is provided on the other side wall of the housing corresponding to the locking member. A part of the pop-out component extends out of the housing. During the process of the battery being placed into the battery compartment and pushed into the locking position, the battery abuts against the pop-out component, causing the pop-out component to move into the housing and accumulate elastic potential energy. When the locking member is disengaged from the locking hook, the pop-out component releases the elastic potential energy and pops the battery outward.

[0012] As a further improvement of this utility model, the pop-out assembly includes a connecting seat, a sliding member, and a pop-out spring. The connecting seat is fixedly connected to the inner wall of the housing. The connecting seat and the inner wall of the housing form a slide for the sliding member to slide. One end of the slide is an opening for the sliding member to extend and retract. The other end of the slide is provided with a support portion. The pop-out spring is disposed between the support portion and the sliding member to provide the sliding member with an outward pop-out motion tendency.

[0013] As a further improvement of this utility model, a notch is provided on the side of the connecting seat, and a limiting member is provided on the sliding member corresponding to the position of the notch. The limiting member cooperates with the notch to limit the maximum travel of the sliding member. A second detection switch is provided on the inner wall of the housing corresponding to the position of the limiting member. When the sliding member is retracted to the position, the limiting member triggers the second detection switch.

[0014] The beneficial effects of this invention are that it achieves passive self-locking by using the guide surface on the lock hook in conjunction with the elastic element to lock upon battery insertion, and the locking action does not rely on the drive mechanism; during unlocking, the drive mechanism actively drives the locking element to disengage from the lock hook, and the torsion spring drives the lock hook to reset, thus achieving unlocking. This passive self-locking combined with active unlocking scheme ensures that the locking does not fail in the power-off state, improving the security of the battery compartment lock, and automatic locking is completed upon battery insertion without any additional operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the present invention (motor example); Figure 2 This is a schematic diagram of the internal structure of the present invention (example of battery pull rod). Figure 3 This is a schematic diagram of the pop-up component of this utility model; Figure 4 This is a three-dimensional schematic diagram of the pop-up component of this utility model; Figure 5 This is a cross-sectional schematic diagram of the pop-up component of this utility model.

[0016] Reference numerals: 1. Housing; 2. Locking element; 21. Trigger; 22. Manual actuation end; 3. Locking hook; 31. Guide surface; 32. Hook; 4. Drive mechanism; 41. Electromagnetic pull rod; 42. Motor; 43. Slider; 5. Torsion spring; 6. Elastic element; 71. First detection switch; 72. Second detection switch; 8. Pop-out assembly; 81. Connecting seat; 82. Sliding element; 821. Limiting element; 83. Pop-out spring; 84. Support; 85. Notch. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0018] Reference Figure 1-5 As shown, a battery compartment lock according to this embodiment includes: Casing 1; Locking member 2 is rotatably connected to housing 1, and locking member 2 can rotate between a first position and a second position; The locking hook 3 is rotatably connected to the housing 1, and the locking hook 3 can rotate between the locked position and the unlocked position; When the locking member 2 is in the first position, it hooks the locking hook 3 to restrict the locking hook 3 from rotating in the unlocking direction; when the locking member 2 is in the second position, it disengages from the locking hook 3. Drive mechanism 4, connected to locking member 2, is used to drive locking member 2 to switch between a first position and a second position; A torsion spring 5 is disposed between the locking hook 3 and the housing 1 to provide a tendency for the locking hook 3 to rotate toward the unlocked position; The elastic element 6 is disposed inside the housing 1 and acts on the locking element 2 to provide a tendency for the locking element 2 to rotate toward the first position. When the locking hook 3 is in the unlocked position, the locking element 2 abuts against the surface of the locking hook 3. When the locking hook 3 is rotated to the locked position, the locking element 2 hooks the locking hook 3 under the action of the elastic element 6. The locking hook 3 is provided with a guide surface 31, which is a guide structure that is inclinedly set on the front end face of the locking hook 3 facing the battery insertion direction, and is used to drive the locking hook 3 to rotate towards the locking position when pushed by the battery locking rod.

[0019] During use, when the battery is pushed into the battery compartment, the locking lever on the battery first contacts the guide surface 31 on the locking hook 3. Since the guide surface 31 is an inclined guide structure located on the front end of the locking hook 3 facing the battery insertion direction, the pushing action of the locking lever on the guide surface 31 generates a component force that causes the locking hook 3 to rotate. As the battery continues to be pushed in, the locking hook 3 is driven by this component force to rotate around its rotational connection position with the housing 1, gradually rotating from the unlocked position to the locked position. During this process, the locking member 2, under the action of the elastic member 6, always has a tendency to rotate towards the first position, moving with the rotation of the locking hook 3 by abutting against its surface. When the locking hook 3 rotates to the locked position, the locking member 2, under the action of the elastic member 6, automatically jumps into the position to hook the locking hook 3, that is, the locking member 2 rotates to the first position and hooks the locking hook 3, restricting the locking hook 3 from rotating towards the unlocking direction, thus completing the automatic locking. Throughout the locking process, the drive mechanism 4 does not require intervention. The locking action is achieved by the mechanical force of the battery pushing in, which drives the hook 3 to rotate via the guide surface 31. This, combined with the biasing force of the elastic element 6, causes the locking member 2 to automatically engage with the hook 3. When unlocking is required, the drive mechanism 4 drives the locking member 2 to rotate from the first position to the second position. The locking member 2 disengages from the hook 3, and the hook 3, under the action of the torsion spring 5, rotates from the locked position to the unlocked position, allowing the battery to be removed. After unlocking, the locking member 2, under the action of the elastic element 6, re-engages with the hook 3, preparing for the next automatic locking. This scheme, by converting the linear motion of the battery pushing in through the guide surface 31 into the rotation of the hook 3, combined with the self-locking of the locking member 2 driven by the elastic element 6, achieves the effect of locking upon insertion. The locking remains even in the event of a power outage, improving security.

[0020] As a further improvement, a trigger part 21 extends from the side of the locking member 2, and a first detection switch 71 is provided in the housing 1 on the movement path corresponding to the trigger part 21. When the locking member 2 is rotated to the second position, the trigger part 21 triggers the first detection switch 71.

[0021] When the drive mechanism 4 drives the locking member 2 to rotate to the second position, the trigger part 21 on the side of the locking member 2 rotates together with the locking member 2, triggering the first detection switch 71 at the corresponding position inside the housing 1. After the first detection switch 71 is triggered, it outputs an electrical signal, so that the control system knows that the locking member 2 has reached the unlocked position, that is, the battery compartment lock is in the unlocked state. Here, the trigger part 21 and the first detection switch 71 do not interfere with the mechanical action of the battery automatic locking, but only serve as an additional function for status detection.

[0022] As a further improvement, the lock hook 3 has a hook portion 32 that extends outward to the outside of the housing 1, and the rotatable connection position between the lock hook 3 and the housing 1 is located in the direction of the extension path of the lock hook 3.

[0023] The hook portion 32 of the locking hook 3 can fully extend out of the housing 1 and reliably contact and engage with the locking rod on the battery. The rotatable connection position is located in the extension path direction of the locking hook 3, which allows the locking hook 3 to have sufficient rotational stroke within the limited housing space, while ensuring structural compactness.

[0024] As an optional implementation, the drive mechanism 4 includes an electromagnetic pull rod 41, which is connected to the locking member 2; the elastic member 6 is a compression spring, which is sleeved on the electromagnetic pull rod 41.

[0025] During operation, when the electromagnetic pull rod 41 is energized, the electromagnetic force overcomes the elastic force of the compression spring, pulling the locking member 2 from the first position to the second position, thus unlocking the device. When the electromagnetic pull rod 41 is de-energized, the elastic force of the compression spring drives the locking member 2 to automatically return from the second position to the first position. Because the compression spring is fitted onto the electromagnetic pull rod 41, the overall design is compact. This solution achieves the safety performance of unlocking upon power-on and self-locking upon power-off. Even in the abnormal situation of a power outage, the elastic force of the compression spring can still drive the locking member 2 to remain in the first position (locked state), and the battery compartment lock will not lose its lock due to power failure.

[0026] As another alternative implementation, the drive mechanism 4 may also include a motor 42 and a slider 43, with the slider 43 connected to the output shaft of the motor 42, and the locking member 2 connected to the slider 43. The motor 42 drives the locking member 2 to rotate through the slider 43.

[0027] This solution uses a motor 42 as the drive source. The motor 42 drives the output shaft to move the slider 43, which in turn drives the connected locking element 2 to rotate, thereby switching the locking element 2 between the first and second positions. Compared with the electromagnetic rod 41 solution, the motor 42 drive has the characteristic of more precise position control, enabling precise unlocking and reset control. This solution can meet the diverse needs of different application scenarios for drive methods.

[0028] Specifically, the output shaft of motor 42 can be threadedly connected to slider 43, and the slider 43 is driven to slide by the rotation of the output shaft. The movement of slider 43 is achieved by the forward and reverse rotation of the output shaft of motor 42.

[0029] Furthermore, the output shaft of the motor 42 is a telescopic shaft, and a buffer spring is provided on the slider 43. The telescopic shaft is connected to the buffer spring. When the motor 42 drives the telescopic shaft to retract, the slider 43 is moved by the elastic force of the buffer spring.

[0030] Motor 42 drives the telescopic shaft to retract. The telescopic shaft does not directly and rigidly pull the slider 43, but indirectly pulls the slider 43 to move through a buffer spring. When motor 42 drives in the reverse direction, the telescopic shaft can be reset.

[0031] Furthermore, the locking member 2 extends outward from the end of the drive mechanism 4 into the housing 1 to form a manual toggle end 22.

[0032] When the drive mechanism 4 is working normally, unlocking is automatically completed by the drive mechanism 4. When the drive mechanism 4 malfunctions or the system loses power, causing the drive mechanism 4 to stop working, the operator can manually drive the locking member 2 from the first position to the second position by moving the manual toggle end 22 outside the housing 1, thus manually completing the unlocking. For the drive mechanism 4 using the electromagnetic pull rod 41, manually moving the locking member 2 directly drives the electromagnetic pull rod 41 to move; in the scheme where the output shaft of the motor 42 is a telescopic shaft and connected to the slider 43 through a buffer spring, when the locking member 2 is manually moved to drive the slider 43, the buffer spring provides a certain extension and contraction margin, so that the manual operation is not hindered by the rigid connection of the telescopic shaft of the motor 42, making the manual operation smoother. The manual toggle end 22 is located outside the housing 1 for easy operation. This scheme can solve the problem of the battery compartment lock being unable to unlock when the drive mechanism 4 malfunctions, improving emergency operation capability. For example, after opening the back panel of the battery compartment, the locking member 2 can be manually operated.

[0033] As a further improvement, a pop-out component 8 is provided on the other side wall of the housing 1 corresponding to the locking member 2. A part of the pop-out component 8 extends out of the housing 1. During the process of the battery being placed into the battery compartment and pushed into the locking position, the battery abuts against the pop-out component 8, causing the pop-out component 8 to move into the housing 1 and accumulate elastic potential energy. When the locking member 2 is disengaged from the locking hook 3, the pop-out component 8 releases the elastic potential energy and pops the battery outward.

[0034] During the process of pushing the battery into the battery compartment, the end face of the battery abuts against the part of the ejector component 8 that extends out of the housing 1. As the battery continues to be pushed inward, it pushes the ejector component 8 into the housing 1, during which the ejector component 8 is compressed and accumulates elastic potential energy. When the battery is fully inserted and locked by the locking hook 3, the ejector component 8 is in a compressed, energy-storing state and remains in a steady state. When it is necessary to remove the battery, the drive mechanism 4 drives the locking member 2 to disengage from the locking hook 3. The locking hook 3 rotates to the unlocked position under the action of the torsion spring 5. At this time, the ejector component 8 loses the restriction of the locking hook 3 on the battery, and the accumulated elastic potential energy is released, ejecting the battery a certain distance outward, allowing the user to easily remove the battery. Because of the mechanism of the ejector component 8 storing energy during locking and automatically releasing it after unlocking, unlocking and battery ejection are linked, allowing the user to remove the battery without additional operation. This solution can solve the problem of conventional battery compartment locks where the battery remains inside the compartment after unlocking, making it inconvenient to remove.

[0035] Furthermore, the pop-out component 8 includes a connecting seat 81, a slider 82, and a pop-out spring 83. The connecting seat 81 is fixedly connected to the inner wall of the housing 1. The connecting seat 81 and the inner wall of the housing 1 form a slide for the slider 82 to slide. One end of the slide is open for the slider 82 to extend and retract. The other end of the slide is provided with a support 84. The pop-out spring 83 is disposed between the support 84 and the slider 82, providing the slider 82 with an outward pop-out motion tendency.

[0036] The connecting seat 81 is fixed inside the housing 1 and forms a slide rail with the inner wall of the housing 1, providing guidance for the extension and retraction of the sliding member 82. The sliding member 82 can slide in a straight line within the slide rail, with one end extending out of the housing 1 from the opening of the slide rail to abut against the battery. One end of the pop-out spring 83 abuts against the support portion 84 at the end of the slide rail, and the other end abuts against the sliding member 82, continuously providing an outward pop-out force to the sliding member 82.

[0037] Furthermore, a notch 85 is provided on the side of the connecting seat 81, and a limiting member 821 is provided at the position of the sliding member 82 corresponding to the notch 85. The limiting member 821 cooperates with the notch 85 to limit the maximum travel of the sliding member 82. A second detection switch 72 is provided on the inner wall of the housing 1 at the position corresponding to the limiting member 821. When the sliding member 82 is retracted to the position, the limiting member 821 triggers the second detection switch 72.

[0038] When the spring 83 pushes the slider 82 outward, the slider 82 moves to the position where the limiting member 821 contacts the notch 85. The limiting member 821 is blocked by the notch 85, preventing the slider 82 from moving further outward and thus preventing the slider 82 from completely disengaging from the track. When the battery is pushed in, the slider 82 moves inward with the battery, and the limiting member 821 moves accordingly. When the slider 82 retracts to its original position (i.e., the battery is fully inserted), the limiting member 821 contacts the second detection switch 72 inside the housing 1. The second detection switch 72 outputs an electrical signal, and the control system knows that the battery has been fully inserted. This design reuses the slider 43 to trigger the second detection switch 72 and achieve the limiting function, realizing multiple effects in a compact structure.

[0039] Based on the above embodiments, the complete battery compartment lock operation is as follows: In the initial state, the locking hook 3 is in the unlocked position under the action of the torsion spring 5, and the locking member 2 abuts against the surface of the locking hook 3 under the action of the elastic member 6. When the user pushes the battery into the battery compartment, the battery locking rod first contacts the guide surface 31 on the locking hook 3. The guide surface 31 converts the linear motion of the battery being pushed in into the rotation of the locking hook 3, and the locking hook 3 rotates from the unlocked position to the locked position. At the same time, during the battery pushing in, it abuts against the ejector component 8, pushing the sliding member 82 to overcome the elastic force of the ejector spring 83 and move into the housing 1. The ejector spring 83 is compressed and accumulates elastic potential energy. When the locking hook 3 rotates to the locked position, the locking member 2 automatically jumps into the position of hooking the locking hook 3 (i.e., the first position) under the action of the elastic member 6, completing the automatic locking. At this time, the battery is firmly locked in the compartment by the locking hook 3, and the ejector component 8 remains in the compressed energy storage state. When the sliding member 82 retracts to the position, the limiting member 821 triggers the second detection switch 72 to confirm that the battery has been pushed in. When the battery needs to be removed, the control system sends an unlocking command to the drive mechanism 4. The drive mechanism 4 drives the locking member 2 to rotate from the first position to the second position, disengaging the locking member 2 from the hook 3. The trigger part 21 triggers the first detection switch 71 to confirm the unlocking is complete. Under the action of the torsion spring 5, the hook 3 rotates to the unlocked position, and the pop-out spring 83 releases its stored elastic potential energy, pushing the sliding member 82 outward to push out the battery, allowing the user to easily remove it. After the battery is removed, the locking member 2, under the action of the elastic member 6, re-abuts against the surface of the hook 3, and the pop-out component 8 returns to its initial state, ready for the next use. If the drive mechanism 4 fails to operate in an emergency, the user can manually drive the locking member 2 to unlock by turning the manual toggle end 22 on the outside of the housing 1.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A battery compartment lock, characterized in that, include: Shell (1); The locking member (2) is rotatably connected to the housing (1), and the locking member (2) is rotatable between a first position and a second position; The locking hook (3) is rotatably connected to the housing (1) and is rotatable between the locked position and the unlocked position; When the locking member (2) is in the first position, it hooks the locking hook (3) to restrict the locking hook (3) from rotating in the unlocking direction; when the locking member (2) is in the second position, it disengages from the locking hook (3). The driving mechanism (4) is connected to the locking member (2) and is used to drive the locking member (2) to switch between the first position and the second position; A torsion spring (5) is disposed between the locking hook (3) and the housing (1) to provide a tendency for the locking hook (3) to rotate toward the unlocked position; An elastic element (6) is disposed inside the housing (1) and acts on the locking element (2) to provide a tendency for the locking element (2) to rotate toward the first position. When the locking hook (3) is in the unlocked position, the locking element (2) abuts against the surface of the locking hook (3). When the locking hook (3) is rotated to the locked position, the locking element (2) hooks the locking hook (3) under the action of the elastic element (6). The locking hook (3) is provided with a guide surface (31), which is a guide structure that is inclined on one side of the locking hook (3) and faces the battery insertion direction, and is used to drive the locking hook (3) to rotate towards the locking position when pushed by the battery locking rod.

2. The battery compartment lock according to claim 1, characterized in that, The locking member (2) has a trigger part (21) extending from its side. A first detection switch (71) is provided in the housing (1) on the movement path corresponding to the trigger part (21). When the locking member (2) is rotated to the second position, the trigger part (21) triggers the first detection switch (71).

3. The battery compartment lock according to claim 1, characterized in that, The lock hook (3) has a hook portion (32) that extends outward to the outside of the housing (1), and the rotatable connection position of the lock hook (3) and the housing (1) is located in the direction of the extension path of the lock hook (3).

4. The battery compartment lock according to claim 1, characterized in that, The drive mechanism (4) includes an electromagnetic pull rod (41), which is connected to the locking member (2); the elastic member (6) is a compression spring, which is sleeved on the electromagnetic pull rod (41).

5. The battery compartment lock according to claim 1, characterized in that, The driving mechanism (4) includes a motor (42) and a slider (43). The slider (43) is connected to the output shaft of the motor (42). The locking member (2) is connected to the slider (43). The motor (42) drives the locking member (2) to rotate through the slider (43).

6. The battery compartment lock according to claim 5, characterized in that, The output shaft of the motor (42) is a telescopic shaft, and a buffer spring is provided on the slider (43). The elastic element (6) is the buffer spring, and the telescopic shaft is connected to the buffer spring. When the motor (42) drives the telescopic shaft to retract, the slider (43) is moved by the elastic force of the buffer spring.

7. The battery compartment lock according to claim 4, 5, or 6, characterized in that, The locking member (2) extends outward from the housing (1) at the end corresponding to the drive mechanism (4) to form a manual toggle end (22).

8. The battery compartment lock according to claim 1, characterized in that, A pop-out component (8) is provided on the other side wall of the housing (1) corresponding to the locking member (2). A part of the pop-out component (8) extends out of the housing (1). During the process of the battery being placed into the battery compartment and pushed into the locking position, the battery abuts against the pop-out component (8), causing the pop-out component (8) to move into the housing (1) and accumulate elastic potential energy. When the locking member (2) is disengaged from the locking hook (3), the pop-out component (8) releases the elastic potential energy and pops the battery outward.

9. The battery compartment lock according to claim 8, characterized in that, The pop-out assembly (8) includes a connecting seat (81), a slider (82), and a pop-out spring (83). The connecting seat (81) is fixedly connected to the inner wall of the housing (1). The connecting seat (81) and the inner wall of the housing (1) form a slide for the slider (82) to slide. One end of the slide is open for the slider (82) to extend and retract. The other end of the slide is provided with a support (84). The pop-out spring (83) is located between the support (84) and the slider (82) to provide the slider (82) with an outward pop-out motion tendency.

10. The battery compartment lock according to claim 9, characterized in that, The side of the connecting seat (81) is provided with a notch (85), and the sliding member (82) is provided with a limiting member (821) corresponding to the position of the notch (85). The limiting member (821) cooperates with the notch (85) to limit the maximum travel of the sliding member (82). The inner wall of the housing (1) is provided with a second detection switch (72) corresponding to the position of the limiting member (821). When the sliding member (82) is retracted to the position, the limiting member (821) triggers the second detection switch (72).

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