Double-motor linkage door lock structure

Abstract

The utility model discloses a double-motor linkage door lock structure in the technical field of intelligent door locks, which comprises a lock cylinder shell and a limit slide rail fixedly mounted on the inner wall of the lock cylinder shell, a spring bolt mounting seat capable of horizontally sliding is arranged on the slide rail, a plurality of groups of spring bolt components are arranged on the left side of the mounting seat, and a main driving motor and a standby driving motor are assembled at the bottom of the mounting seat. The main motor drives the spring bolt mounting base to move horizontally through the gear transmission system, the standby motor is standby when the main motor works normally and is automatically started when detecting that the main motor breaks down, after the standby motor is started, the fourth transmission gear rotates to enable the limiting sliding block to retract along the transition fillet, and when the limiting sliding block reaches the position of the clutch clamping groove, the limiting sliding block pops up and is locked under the action of the elastic element. By means of the structure, the problem of transmission interference of the main motor and the standby motor is effectively solved, it is ensured that standby power is reliably transmitted to the spring bolt installation base, and the stability and safety of operation of the door lock are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of smart door lock technology, and in particular to a dual-motor linkage door lock structure. Background Technology

[0002] With the rapid development of intelligent security technology, door locks, as key devices for ensuring security, are becoming increasingly automated and intelligent. Traditional single-motor driven door locks, during long-term use, often fail to open or close properly if the motor malfunctions or encounters a power outage, significantly impacting security and convenience. While some door locks employ multi-motor collaborative drive to improve reliability, these methods suffer from complex motor control logic, low transmission efficiency, and high costs, failing to meet market demands for high-performance, cost-effective door locks. Against this backdrop, this dual-motor linkage door lock structure has emerged. Through innovative design of the linkage mechanism between the main drive motor and the backup drive motor, along with supporting gear transmission and clutch transmission systems, it effectively improves the stability and reliability of door lock operation without significantly increasing costs, providing an efficient and practical solution for the intelligent security field.

[0003] In existing door lock drive technologies, the transmission modules corresponding to the various motors in most products often interfere with each other. When the main motor fails and the backup motor is activated, independent drive is not possible, rendering the backup motor ineffective. Some door locks with multiple transmission modules suffer from poor structural design and a lack of precise control over power transmission between modules. This results in the backup motor not only failing to output stable power but also potentially causing wear and tear on mechanical components due to transmission chaos, thus affecting the door lock's lifespan and reliability. Therefore, we propose a dual-motor linkage door lock structure to address the aforementioned problems. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Therefore, the purpose of this utility model is to provide a dual-motor linkage door lock structure, which can solve the problem that in the existing door lock drive technology, the transmission modules corresponding to each motor often interfere with each other. When the main motor fails and the backup motor is activated, it cannot achieve independent drive, making it difficult for the backup motor to play an effective role. Some door locks with multiple transmission modules have unreasonable structural design and lack precise control of power transmission between modules. When the backup motor intervenes, it not only cannot output power stably, but may also cause wear of mechanical parts due to transmission chaos, affecting the service life and reliability of the door lock.

[0006] To solve the above-mentioned technical problems, this utility model provides a dual-motor linkage door lock structure, adopting the following technical solution: It includes a lock cylinder housing, with a limiting slide rail fixed to the inner wall of the lock cylinder housing by bolts. A latch mounting seat is provided on the limiting slide rail, which can reciprocate horizontally. Multiple latch components are fixed to the left side of the latch mounting seat. A main drive motor and a backup drive motor are assembled on the bottom inside the latch mounting seat. The main drive motor is connected to the latch mounting seat through a gear transmission system and is used to drive the latch mounting seat to perform reciprocating linear motion in the horizontal direction. The backup drive motor is in standby mode when the main drive motor is operating normally. When the main drive motor is detected to have stopped running, the backup drive motor starts working, achieving the same transmission function as the main drive motor.

[0007] Optionally, a first transmission module is provided on the top of the main drive motor. The first transmission module includes a first transmission link, a first transmission gear, and a second transmission gear. The top of the main drive motor is provided with a first transmission link assembly that can reciprocate in the vertical direction. The first transmission gear is located directly above the main drive motor and is mounted in the inner cavity of the lock cylinder housing via a shaft. A first transmission clearance groove is provided on the first transmission gear. The top end of the first transmission link is movably embedded in the first transmission clearance groove of the first transmission gear. The main drive motor drives the first transmission link to perform reciprocating linear motion in the vertical direction, thereby driving the first transmission gear to rotate.

[0008] Optionally, a second transmission gear is arranged on the upper left of the first transmission gear. The second transmission gear is axially mounted inside the latch mounting seat through a bearing assembly. The outer circumferences of the first and second transmission gears are integrally formed with meshing transmission gear systems. The first transmission gear drives the second transmission gear to rotate through the transmission gear system. The upper side of the latch mounting seat is provided with a transmission limiting groove with an inclined angle. The shaft end of the second transmission gear is movablely limited within the transmission limiting groove. The second transmission gear drives the latch mounting seat to perform reciprocating linear motion in the horizontal direction.

[0009] Optionally, a second transmission module is provided on the top of the backup drive motor. The second transmission module includes a second transmission connecting rod, a third transmission gear, and a fourth transmission gear. The top of the backup drive motor is provided with a second transmission connecting rod that can reciprocate in the vertical direction. The third transmission gear is axially mounted above the backup drive motor through a bearing assembly. The third transmission gear has a second transmission clearance groove. The top end of the second transmission connecting rod is movably embedded in the second transmission clearance groove of the third transmission gear. The backup drive motor drives the second transmission connecting rod to perform reciprocating linear motion in the vertical direction, thereby driving the third transmission gear to rotate.

[0010] Optionally, a fourth transmission gear is axially connected and installed on the upper right side of the third transmission gear. Both the third and fourth transmission gears have meshing transmission gear systems on their outer circumferences. The third transmission gear drives the fourth transmission gear to rotate through the power transmitted by the second transmission link.

[0011] Optionally, the shaft end of the fourth transmission gear is provided with a clutch transmission device, the clutch transmission device includes a limiting slider and a reset elastic element, the shaft end of the fourth transmission gear is provided with a guide limiting groove, the limiting slider is slidably disposed in the guide limiting groove, and a reset elastic element is installed between the limiting slider and the bottom of the guide limiting groove, the reset elastic element applies an outward elastic force to the limiting slider.

[0012] Optionally, the lower part of the latch mounting base is provided with a transition rounded corner structure and a clutch slot. The clutch slot is located at the starting end of the transition rounded corner structure. When the main drive motor fails and the backup drive motor is activated, the backup drive motor drives the second transmission link, the second transmission link drives the third transmission gear, and the third transmission gear drives the fourth transmission gear to rotate counterclockwise. The transition rounded corner structure causes the limit slider to retract into the guide limit groove. When it moves to the clutch slot position, the limit slider pops out under the action of the reset elastic element and locks into the clutch slot to achieve clutch locking. Then, the backup drive motor drives the latch mounting base to perform reciprocating linear motion in the horizontal direction.

[0013] In summary, this utility model has at least one of the following beneficial effects: 1. By setting a clutch transmission device at the end of the fourth transmission gear shaft, and cooperating with the transition rounded corner structure and clutch slot on the lower side of the lock tongue mounting seat, after the standby drive motor starts, during the rotation of the fourth transmission gear, the transition rounded corner is used to retract the limit slider, and then the reset elastic element is used to accurately engage it in the clutch slot to achieve clutch locking. This achieves the purpose of accurately controlling the power transmission of the standby motor, ensuring that the power of the standby motor is effectively transmitted to the lock tongue mounting seat, and avoiding interference between the main and standby motor transmissions.

[0014] 2. By installing a main drive motor and a backup drive motor, along with their corresponding first and second transmission modules, when the main drive motor is working normally, the first transmission module stably transmits power to the latch mounting base, driving it to move horizontally. When the main drive motor fails, the backup drive motor starts, and the second transmission module takes over, ensuring that the latch mounting base can still operate normally. This achieves the construction of a highly reliable power system and effectively avoids the door lock from failing due to a single motor failure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall half-section structure of this utility model;

[0018] Figure 3 This is a detailed structural diagram of the first transmission module and the second transmission module of this utility model;

[0019] Figure 4 This is a schematic diagram of the retraction structure of the first transmission module of this utility model;

[0020] Figure 5 This is a schematic diagram of the working structure of the second transmission module of this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1. Lock cylinder housing;

[0022] 2. Limiting slide rail; 21. Lock tongue mounting base; 211. Transmission limiting slide groove; 212. Transition rounded corner structure; 213. Clutch slot; 22. Lock tongue component;

[0023] 3. Main drive motor; 4. Backup drive motor;

[0024] 5. First transmission module; 51. First transmission connecting rod; 52. First transmission gear; 521. First transmission clearance groove; 53. Second transmission gear;

[0025] 6. Transmission gear system;

[0026] 7. Second transmission module; 71. Second transmission connecting rod; 72. Third transmission gear; 721. Second transmission clearance groove; 73. Fourth transmission gear; 731. Guide limiting groove;

[0027] 8. Clutch transmission device; 81. Limit slider; 82. Reset elastic element. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in further detail below.

[0029] Example 1, refer to Figure 1-5 In this embodiment, to address the problem that in existing door lock drive technologies, the transmission modules corresponding to the various motors often interfere with each other, making it impossible to achieve independent drive when the main motor fails and the backup motor is activated. This results in the backup motor being unable to function effectively. Furthermore, some door locks with multiple transmission modules suffer from poor structural design and a lack of precise control over power transmission between modules. This leads to unstable power output when the backup motor intervenes, and potential wear and tear on mechanical components due to transmission chaos, affecting the lifespan and reliability of the door lock. Therefore, this utility model discloses a dual-motor linkage door lock structure.

[0030] The lock cylinder housing 1 includes a limit slide rail 2 bolted to its inner wall. The limit slide rail 2 has a latch mounting seat 21 that can reciprocate horizontally. Multiple latch components 22 are fixed to the left side of the latch mounting seat 21. A main drive motor 3 and a standby drive motor 4 are mounted inside the bottom of the latch mounting seat 21. The main drive motor 3 is connected to the latch mounting seat 21 via a gear transmission system and drives the latch mounting seat 21 to perform reciprocating linear motion in the horizontal direction. The standby drive motor 4 is in standby mode when the main drive motor 3 is operating normally. When the main drive motor 3 is detected, the standby drive motor 4 is activated. When motor 3 stops running, the backup drive motor 4 starts working, achieving the same transmission function as the main drive motor 3. It is connected to the latch mounting base 21 through a gear transmission system. When the main drive motor 3 is running normally, it is responsible for driving the latch mounting base 21 to move horizontally and reciprocally in a linear motion, while the backup drive motor 4 is on standby. When the main drive motor 3 stops running, the backup drive motor 4 starts working in its place, thus achieving the goal of ensuring the normal operation of the latch even when the main motor fails. This improves the reliability of the door lock drive system, avoids door lock malfunction due to motor failure, and ensures stable operation of the door lock.

[0031] The main drive motor 3 has a first transmission module 5 on its top. The first transmission module 5 includes a first transmission link 51, a first transmission gear 52, and a second transmission gear 53. The main drive motor 3 has a first transmission link 51 assembly on its top that can reciprocate vertically. The first transmission gear 52 is located directly above the main drive motor 3 and is mounted on the inner cavity of the lock cylinder housing 1 via a shaft. The first transmission gear 52 has a first transmission clearance groove 521. The top end of the first transmission link 51 is movably fitted into the first transmission clearance groove 521 of the first transmission gear 52. The main drive motor 3 drives the first transmission link 51 to move forward. The reciprocating linear motion in the vertical direction drives the first transmission gear 52 to rotate. The main drive motor 3 drives the first transmission connecting rod 51 to reciprocate in the vertical direction, so that its top end moves in the transmission clearance groove of the first transmission gear 52, driving the first transmission gear 52 to rotate. Then, the power is transmitted to the second transmission gear 53 through the meshing transmission gear system 6. This achieves the purpose of efficiently and stably transmitting the power of the main drive motor 3 and converting it into the driving force for the horizontal movement of the lock tongue mounting seat 21. This achieves the effect of precisely controlling the movement of the lock tongue mounting seat 21, ensuring smooth door lock opening and closing, and improving the door lock transmission efficiency and reliability.

[0032] A second transmission gear 53 is arranged on the upper left side of the first transmission gear 52. The second transmission gear 53 is axially mounted inside the latch mounting seat 21 via a bearing assembly. Both the first transmission gear 52 and the second transmission gear 53 have interlocking transmission gear systems 6 integrally formed on their outer circumferences. The first transmission gear 52 drives the second transmission gear 53 to rotate through the transmission gear system 6. A transmission limiting groove 211 with an inclined angle is provided on the upper side of the latch mounting seat 21. The shaft end of the second transmission gear 53 is movably limited within the transmission limiting groove 211. The second transmission gear 53 drives the latch mounting seat 21 to rotate. 1. The main drive motor 3 drives the first transmission link 51 to reciprocate in the vertical direction, so that its top end moves in the transmission clearance groove of the first transmission gear 52, causing the first transmission gear 52 to rotate. Then, the power is transmitted to the second transmission gear 53 through the meshing transmission gear system 6. This achieves the purpose of efficiently and stably transmitting the power of the main drive motor 3 and converting it into the driving force for the horizontal movement of the lock tongue mounting seat 21. This achieves the effect of accurately controlling the movement of the lock tongue mounting seat 21, ensuring smooth door lock opening and closing, and improving the door lock transmission efficiency and reliability.

[0033] The standby drive motor 4 has a second transmission module 7 on its top. The second transmission module 7 includes a second transmission connecting rod 71, a third transmission gear 72, and a fourth transmission gear 73. The standby drive motor 4 has a second transmission connecting rod 71 on its top that can reciprocate vertically. The third transmission gear 72 is axially mounted above the standby drive motor 4 via a bearing assembly. The third transmission gear 72 has a second transmission clearance groove 721. The top end of the second transmission connecting rod 71 is movably fitted into the second transmission clearance groove 721 of the third transmission gear 72. The standby drive motor 4 drives the second transmission connecting rod 71 to perform reciprocating linear motion in the vertical direction, thereby driving the third transmission gear 73. The transmission gear 72 rotates, driving the second transmission link 71 to reciprocate vertically via the backup drive motor 4. This causes the top end of the link to move within the second transmission clearance groove 721 of the third transmission gear 72, thus rotating the third transmission gear 72. Power is transmitted through the transmission gear system 6, which meshes with the outer periphery of the third transmission gear 72 and the fourth transmission gear 73. This achieves the goal of stably transmitting the power of the backup drive motor 4 and converting it into driving the horizontal movement of the lock tongue mounting base 21 when the main drive motor 3 fails. This ensures that the door lock can still work normally in the event of a main motor failure, improving the door lock's emergency working capability and overall reliability.

[0034] The third transmission gear 72 is axially connected to the upper right of the fourth transmission gear 73. Both the third transmission gear 72 and the fourth transmission gear 73 are provided with meshing transmission gear systems 6 on their outer circumferences. The third transmission gear 72 drives the fourth transmission gear 73 to rotate through the power transmitted by the second transmission link 71. By setting the transmission gear system 6, the third transmission gear 72 rotates after receiving the power transmitted by the second transmission link 71. Through the meshing of the gear system, the power is efficiently and stably transmitted to the fourth transmission gear 73, achieving the purpose of accurately and stably transmitting the power of the backup drive motor 4. This ensures that there is no slippage or jamming during the power transmission process, and ensures that the lock tongue mounting seat 21 runs smoothly under the drive of the backup motor, thereby improving the transmission reliability and stability of the door lock backup drive system.

[0035] The shaft end of the fourth transmission gear 73 is provided with a clutch transmission device 8, which includes a limiting slider 81 and a reset elastic element 82. The shaft end of the fourth transmission gear 73 is provided with a guide limiting groove 731. The limiting slider 81 is slidably disposed in the guide limiting groove 731. The reset elastic element 82 is installed between the limiting slider 81 and the bottom of the guide limiting groove 731. The reset elastic element 82 applies an outward elastic force to the limiting slider 81. By applying an outward elastic force to the limiting slider 81 by the reset elastic element 82, the purpose of reliably disengaging the fourth transmission gear 73 from the lock tongue mounting seat 21 is achieved when the standby drive motor 4 is started. This ensures effective power transmission when the standby motor is working and avoids interference when the standby motor is not needed, thereby improving the working flexibility and reliability of the door lock drive system.

[0036] The lower part of the latch mounting base 21 is provided with a transition rounded corner structure 212 and a clutch slot 213. The clutch slot 213 is located at the starting end of the transition rounded corner structure 212. When the main drive motor 3 fails and the backup drive motor 4 is activated, the backup drive motor 4 drives the second transmission link 71, which drives the third transmission gear 72. The third transmission gear 72 drives the fourth transmission gear 73 to rotate counterclockwise. Through the transition rounded corner structure 212, the limiting slider 81 retracts into the guide limiting groove 731. When it moves to the clutch slot 213 position, the limiting slider 81 pops out under the action of the reset elastic element 82 and locks into the clutch slot 213 to achieve clutch locking. Then, the backup drive motor 4 drives the latch mounting base 21 to reciprocate in the horizontal direction. The linear motion, through the sliding of the limiting slider 81 in the guide limiting groove 731 and the elastic force of the reset elastic element 82, when the main drive motor 3 fails and the backup drive motor 4 is activated, during the counterclockwise rotation of the fourth transmission gear 73, the transition rounded corner structure 212 causes the limiting slider 81 to retract into the guide limiting groove 731. When it moves to the clutch slot 213 position, the limiting slider 81 pops out and locks into the clutch slot 213 under the action of the reset elastic element 82, achieving the purpose of quick and reliable clutch locking between the backup drive motor 4 and the lock tongue mounting seat 21. This enables the backup motor to intervene in work in a timely manner and stably drive the lock tongue mounting seat 21, ensuring the normal use of the door lock in the event of a main motor failure, and improving the door lock's emergency response capability and reliability.

[0037] The specific working principle is as follows: By setting a clutch transmission device 8 at the end of the fourth transmission gear 73 shaft, and cooperating with the transition rounded corner structure 212 and clutch slot 213 on the lower side of the latch mounting seat 21, after the backup drive motor 4 starts, during the rotation of the fourth transmission gear 73, the transition rounded corner causes the limit slider 81 to retract, and then the reset elastic element 82 precisely engages it in the clutch slot 213, achieving clutch locking. This achieves the purpose of precisely controlling the power transmission of the backup motor, ensuring that the backup motor power is effectively transmitted to the latch mounting seat 21, and avoiding interference between the main and backup motors. By installing the main drive motor 3 and the backup drive motor 4, along with their corresponding first transmission module 5 and second transmission module 7, when the main drive motor 3 is working normally, the first transmission module 5 stably transmits power to the latch mounting seat 21, driving its horizontal movement; when the main drive motor 3 fails, the backup drive motor 4 starts, and the second transmission module 7 takes over, ensuring that the latch mounting seat 21 can still operate normally. This achieves the construction of a highly reliable power system and effectively avoids the door lock failure due to a single motor failure.

[0038] The wiring diagrams of the main drive motor 3 and the backup drive motor 4 in this utility model are common knowledge in the field. Their working principle is a well-known technology. The appropriate model is selected according to the actual use. Therefore, the control method and wiring arrangement of the main drive motor 3 and the backup drive motor 4 will not be explained in detail.

[0039] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A dual-motor linkage door lock structure, comprising a lock cylinder housing (1), characterized in that: The inner wall of the lock cylinder housing (1) is fixed with a limiting slide rail (2) by bolts. The limiting slide rail (2) is provided with a lock tongue mounting seat (21) that can slide back and forth in the horizontal direction. Multiple lock tongue components (22) are fixed to the left side of the lock tongue mounting seat (21). The bottom side of the lock tongue mounting seat (21) is equipped with a main drive motor (3) and a backup drive motor (4). The main drive motor (3) is connected to the lock tongue mounting seat (21) through a gear transmission system and is used to drive the lock tongue mounting seat (21) to perform reciprocating linear motion in the horizontal direction. The backup drive motor (4) is in standby mode when the main drive motor (3) is running normally. When the main drive motor (3) is detected to be stopped, the backup drive motor (4) starts working and realizes the same transmission function as the main drive motor (3).

2. The dual-motor linkage door lock structure according to claim 1, characterized in that: The main drive motor (3) is provided with a first transmission module (5) on its top. The first transmission module (5) includes a first transmission link (51), a first transmission gear (52), and a second transmission gear (53). The main drive motor (3) is provided with a first transmission link (51) assembly that can reciprocate in the vertical direction on its top. The first transmission gear (52) is located directly above the main drive motor (3). The first transmission gear (52) is mounted on the inner cavity of the lock cylinder housing (1) through a shaft. A first transmission clearance groove (521) is provided on the first transmission gear (52). The top end of the first transmission link (51) is movably embedded in the first transmission clearance groove (521) of the first transmission gear (52). The main drive motor (3) drives the first transmission link (51) to perform reciprocating linear motion in the vertical direction, thereby driving the first transmission gear (52) to rotate.

3. The dual-motor linkage door lock structure according to claim 2, characterized in that: A second transmission gear (53) is arranged on the upper left of the first transmission gear (52). The second transmission gear (53) is axially installed inside the latch mounting seat (21) through a bearing assembly. The outer circumferences of the first transmission gear (52) and the second transmission gear (53) are integrally formed with a meshing transmission gear system (6). The first transmission gear (52) drives the second transmission gear (53) to rotate through the transmission gear system (6). The upper side of the latch mounting seat (21) is provided with a transmission limiting groove (211) with an inclined angle. The shaft end of the second transmission gear (53) is located within the transmission limiting groove (211). The second transmission gear (53) drives the latch mounting seat (21) to perform reciprocating linear motion in the horizontal direction.

4. The dual-motor linkage door lock structure according to claim 1, characterized in that: The backup drive motor (4) is provided with a second transmission module (7) on top. The second transmission module (7) includes a second transmission link (71), a third transmission gear (72), and a fourth transmission gear (73). The backup drive motor (4) is provided with a second transmission link (71) that can reciprocate in the vertical direction on top. The backup drive motor (4) is axially mounted with a third transmission gear (72) through a bearing assembly above it. The third transmission gear (72) is provided with a second transmission clearance groove (721). The top end of the second transmission link (71) is movably embedded in the second transmission clearance groove (721) of the third transmission gear (72). The backup drive motor (4) drives the second transmission link (71) to perform reciprocating linear motion in the vertical direction, thereby driving the third transmission gear (72) to rotate.

5. The dual-motor linkage door lock structure according to claim 4, characterized in that: The third transmission gear (72) is axially connected to the upper right of the fourth transmission gear (73). Both the third transmission gear (72) and the fourth transmission gear (73) are provided with meshing transmission gear systems (6) on their outer circumferences. The third transmission gear (72) drives the fourth transmission gear (73) to rotate through the power transmitted by the second transmission link (71).

6. The dual-motor linkage door lock structure according to claim 5, characterized in that: The shaft end of the fourth transmission gear (73) is provided with a clutch transmission device (8). The clutch transmission device (8) includes a limiting slider (81) and a reset elastic element (82). The shaft end of the fourth transmission gear (73) is provided with a guide limiting groove (731). The limiting slider (81) is slidably disposed in the guide limiting groove (731). A reset elastic element (82) is installed between the limiting slider (81) and the bottom of the guide limiting groove (731). The reset elastic element (82) applies an outward elastic force to the limiting slider (81).

7. The dual-motor linkage door lock structure according to claim 1, characterized in that: The lower part of the latch mounting base (21) is provided with a transition rounded corner structure (212) and a clutch slot (213). The clutch slot (213) is located at the starting end of the transition rounded corner structure (212). When the main drive motor (3) fails and the backup drive motor (4) is activated, the backup drive motor (4) drives the second transmission link (71), the second transmission link (71) drives the third transmission gear (72), and the third transmission gear (72) drives the fourth transmission gear (73) to rotate counterclockwise. The transition rounded corner structure (212) causes the limiting slider (81) to retract into the guide limiting groove (731). When it moves to the clutch slot (213) position, the limiting slider (81) pops out under the action of the reset elastic element (82) and is locked into the clutch slot (213) to achieve clutch locking. Then, the backup drive motor (4) drives the latch mounting base (21) to perform horizontal reciprocating linear motion.

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