Motor clutch structure for fingerprint locks designed to prevent forced entry

Abstract

This utility model discloses a motor clutch structure for preventing forced entry into a fingerprint lock, including a housing and a clutch structure. The clutch structure includes an inner separating plate, an outer separating plate, and a connector. The outer separating plate has a socket, and the connector has a through hole. A locking element is provided between the outer and inner separating plates. The clutch structure also includes a motor assembly for linkage with the circuit module of an external fingerprint lock, so that when the external circuit module sends a command, it drives the locking element to operate, thereby realizing the linkage or disengagement of the inner separating plate and the connector. The outer separating plate is provided with a limiting component for separating the inner and outer separating plates to prevent the inner separating plate from idling when the external user forcibly opens the outer handle. This utility model solves the problem that in the traditional fingerprint lock electronic clutch structure, when the external handle is forcibly opened, the rotational power of the outer handle connecting rod is directly transmitted to the lock body square rod through the clutch, causing the lock body to be forcibly driven to unlock.

Description

Technical Field

[0001] This utility model relates to the field of fingerprint lock technology, specifically to a motor clutch structure for preventing forced entry of a fingerprint lock. Background Technology

[0002] With the rapid development of the smart home industry, fingerprint locks have become an important device for improving the security and convenience of access control, thanks to their advantages such as no need to carry keys, convenient identity recognition, and efficient operation.

[0003] Among them, the motor clutch structure, as the core functional component of the fingerprint lock, plays a crucial role in transmitting power to complete the unlocking action when the verification is successful, and cutting off the power transmission to ensure the safety of the lock body when the verification is unsuccessful or the lock is locked. The electronic clutch structure of traditional fingerprint locks usually adopts a design in which the separator plate, the connecting plate and the motor are directly linked. The external handle connecting rod is connected through the separator plate, and the connecting plate is connected to the square rod of the lock body. During normal unlocking, the motor drives the connecting plate to rotate, thereby realizing the linkage between the connecting plate and the separator plate. When the external handle is turned, the separator plate can drive the connecting plate to rotate synchronously to achieve unlocking. Its performance directly determines the security, stability and service life of the fingerprint lock.

[0004] However, the electronic clutch structure used in existing traditional fingerprint locks has significant shortcomings in its security design. When criminals forcibly turn the outer handle, the rotational power of the outer handle connecting rod is directly transmitted to the lock body rod through the clutch transmission path, causing the lock body to be forcibly driven in an unauthorized state, ultimately leading to the illegal opening of the door. This security risk not only renders the fingerprint lock's security protection function ineffective in resisting forced unlocking, but also seriously threatens the user's property safety and even personal safety, greatly limiting the application and promotion of fingerprint locks in scenarios with high security requirements. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a motor clutch structure for preventing forced unlocking of fingerprint locks. This solves the problem that in traditional fingerprint locks, the rotational power of the outer handle connecting rod is directly transmitted to the lock body square rod through the clutch when the outer handle is forcibly opened by external force, thus causing the lock body to be forcibly driven to unlock.

[0006] To achieve the above objectives, this utility model provides a motor clutch structure for preventing forced entry into a fingerprint lock, comprising a housing for installation inside an external fingerprint lock and a clutch structure. The clutch structure includes an inner separating plate, an outer separating plate, and a connector built into the housing. The outer separating plate has a socket for mating with an external handle connecting rod, and the connector has a through hole for mating with a square rod in the external fingerprint lock. A locking element is provided between the outer separating plate and the inner separating plate to engage or disengage the inner separating plate from the connector. The clutch structure also includes a motor assembly for engaging with the circuit module of the external fingerprint lock so that when the external circuit module sends a command, it drives the locking element to engage or disengage the inner separating plate from the connector. The outer separating plate has a limiting component for separating the inner separating plate from the outer separating plate when the external user forcibly opens the external handle, thus allowing the inner separating plate to idle.

[0007] The advantages of adopting the above technical solution are as follows: the technology ensures accurate power transmission during normal unlocking by mates the outer separator plate with the outer handle connecting rod and the connector through hole with the square rod; the locking component and motor assembly are linked to achieve linkage or disengagement between the inner separator plate and the connector, ensuring power transmission control under the authorized state of the external fingerprint lock's circuit module, control module, or identification module; and the limiting component separates the inner and outer separator plates when the external user forcibly opens the door handle, allowing the inner separator plate to spin freely, blocking the transmission of power to the lock body square rod, preventing the lock body from being forcibly driven, and significantly improving the fingerprint lock's resistance to forced unlocking.

[0008] The present invention further comprises: the limiting component includes at least two clamping plates disposed on the inner wall of the outer separating plate, each pair of clamping plates being disposed opposite to each other and bent toward the outer wall of the inner separating plate, and a slot being disposed on the inner separating plate corresponding to each clamping plate position, each clamping plate being engaged with its corresponding slot, and the clamping plates and slots being connected by a stamping process or a welding process.

[0009] The advantages of adopting the above technical solution are as follows: The interlocking mechanism between the locking plate and the slot ensures balanced force distribution during normal transmission of the inner and outer separating plates, improving power transmission stability. The design of the locking plate bending towards the outer wall of the inner separating plate enhances the locking strength, ensuring reliable linkage under normal unlocking torque. When forcibly opened, the interlocking strength between the locking plate and the slot is below the violent torque, causing the locking plate to break and separate, blocking power transmission and allowing the inner separating plate to spin freely, thus preventing the lock body structure in the external fingerprint lock from being forcibly driven. The above technology uses stamping or welding processes to connect the locking plate and the slot. Stamping achieves integrated molding, improving structural consistency, while welding enhances connection strength, adapting to different production needs, reducing the number of parts, and lowering processing and assembly costs. The above technology uses at least two locking plates, which can be increased or decreased according to actual needs and anti-explosion strength requirements.

[0010] The present invention further includes the following: the limiting component also includes an anti-breakage bolt connected to the inner separation plate; the housing is composed of a front cover plate and a rear cover plate that are detachably connected; a positioning groove is provided on the front cover plate; the rod end of the anti-breakage bolt is movably disposed in the positioning groove; the radial cross section of the positioning groove is arc-shaped and the arc direction is consistent with the fan-shaped swing direction of the anti-breakage bolt.

[0011] The advantages of adopting the above technical solution are: the front cover and rear cover are detachably connected, which facilitates the assembly and subsequent maintenance of the clutch structure and reduces the difficulty of repair when internal components fail; the anti-breakage bolt is connected to the inner separator plate and cooperates with the arc-shaped positioning groove of the front cover plate to limit the excessive rotation of the inner separator plate under violent impact, allowing it to move within the normal swing range; the arc direction of the positioning groove is consistent with the fan-shaped swing direction of the anti-breakage bolt, ensuring uniform force during the limiting process, avoiding bolt breakage due to uneven load, improving the structural durability of the clutch under violent scenarios, and ensuring the motion stability of the inner separator plate when it is idling.

[0012] The present invention further includes: a reset torsion spring on the inner separating plate; both ends of the front cover plate are bent with abutment portions; the reset torsion spring includes a coil portion and two shaft portions; the two shaft portions are respectively abutted and cooperated with the two abutment portions; and the coil portion is connected to the inner separating plate.

[0013] The advantages of adopting the above technical solution are: the reset torsion spring provides elastic reset force to the inner separator plate, ensuring that the inner separator plate can automatically reset after not running or stopping, thus ensuring the structural fit accuracy during the next normal unlocking; the two shaft parts abut against the front cover plate respectively, so that the torsion spring is subjected to balanced force, improving the stability and reliability of the reset action, while the coil part is firmly connected to the inner separator plate, ensuring effective transmission of reset force, preventing the torsion spring from falling off after long-term use, extending the service life of the reset structure, and maintaining the continuous and stable operation of the clutch.

[0014] The present invention further comprises: a guide block is provided on the bottom wall of the connector, a sliding groove is provided on the guide block, the locking member includes a locking piece that is slidably disposed in the sliding groove, a locking groove is provided on the inner separating piece, and the motor assembly and the locking piece are linked and cooperated to realize the insertion of the beginning end of the locking piece into the locking groove when the motor assembly is running and pushes the locking piece to lift.

[0015] The advantages of adopting the above technical solution are: the guide block groove provides a stable path for the sliding of the locking piece, ensuring the precise movement of the locking piece; the locking piece and the inner separating piece are mated in the locking groove to achieve rigid linkage between the inner separating piece and the connector, resulting in a compact structure and efficient transmission; and the motor assembly is linked with the locking piece to push the locking piece up to achieve mating, ensuring timely control of power transmission under the authorized state of the external fingerprint lock, improving the operating sensitivity and control accuracy of the clutch, and adapting to the fast unlocking requirements of fingerprint locks.

[0016] The present invention further includes: a return spring provided in the slide groove, the return spring being a square spring, the return spring being sleeved on the locking piece, the end of the return spring being connected to the inner peripheral wall of the locking groove, and the beginning of the return spring being connected to the end of the locking piece.

[0017] The advantages of adopting the above technical solution are as follows: In the above technology, the return spring provides the reset power for the locking plate. When the motor assembly stops running, it drives the locking plate to slide and reset, disengaging from the locking groove, releasing the linkage between the inner separating plate and the connector, and ensuring power interruption in the unauthorized state; In the above technology, the return spring is a square spring and is sleeved on the locking plate, which improves the stability of the cooperation between the spring and the locking plate and avoids spring deviation; The two ends of the spring are respectively connected to the locking groove and the locking plate, so that the overall force is uniform to reduce the risk of excessive deformation, thereby extending the service life of the spring and ensuring the long-term reliability of the reset function.

[0018] The present invention further includes: the locking component also includes a guide rail, the guide rail having an arc-shaped radial cross-section and the top surface of the guide rail being a guide surface for contacting the bottom wall of the guide block to guide the swing of the guide block when the connector rotates and drives the guide block to swing; the guide rail has a guide groove, the guide groove having an arc-shaped radial cross-section and the arc of the guide groove being consistent with the swing trajectory of the guide block; the bottom wall of the locking piece has a locking piece bent, the locking piece having an arc shape and slidingly disposed in the guide groove along the opening direction of the guide groove.

[0019] The advantages of adopting the above technical solution are as follows: In the above technology, the guide surface of the arc-shaped guide rail contacts the bottom wall of the guide block when the connector drives the guide block to swing, guiding its swing, reducing motion friction, and improving the smoothness of the connector rotation; while the arc-shaped guide groove is consistent with the swing trajectory of the guide block, and cooperates with the sliding of the locking plate to limit the radial offset of the locking plate, ensuring the alignment accuracy between the locking plate and the locking groove; in the above technology, the arc-shaped setting of the locking plate to adapt to the guide groove enhances the overall stability of the locking component's movement, improves the structural reliability of the clutch for long-term use, and reduces component wear.

[0020] The present invention further comprises: a motor assembly including a housing, a drive motor and a gear set disposed inside the housing; a lifting groove is provided in the housing; a lifting block is connected to the bottom of the guide rail; the lifting block is movably disposed in the lifting groove; the lifting block is hollow and has a mating groove; an upper shaft and a lower shaft are coaxially disposed in the lifting groove; the upper shaft and the lower shaft are threadedly connected; the upper shaft and the lower shaft pass through the lifting groove; the lower shaft is connected to the output end of the drive motor via the gear set; and an abutment shaft is provided on the outer peripheral wall of the upper shaft for abutting against the top wall of the lifting groove when the lower shaft rotates and drives the upper shaft to rise, thereby driving the lifting block to move up and down along the opening direction of the lifting groove.

[0021] The advantages of adopting the above technical solution are as follows: In the above technology, the housing provides protection and installation foundation for components such as drive motor and gear set, improving the stability of the internal structure. The drive motor drives the lower shaft to rotate through the gear set, and the threaded connection between the upper shaft and the lower shaft enables the upper shaft to move up and down when the lower shaft rotates. The entire transmission process is efficient and highly precise. When the upper shaft moves up, the abutting shaft abuts against the top wall of the lifting groove, thereby driving the lifting block to rise and fall, thus driving the guide rail to rise. This achieves precise driving of the locking component by the motor assembly, ensuring timely power transmission. In the above technology, the hollow design of the lifting block reduces weight, improves the motion response speed, enhances the energy efficiency of the motor drive, and ensures that the clutch responds quickly to the unlocking command.

[0022] This utility model further includes a manual unlocking structure, comprising a lock shell detachably connected to the bottom of an external fingerprint lock housing, a lock cylinder for engaging with an external key to unlock or lock, and a lock shaft that rotates synchronously with the lock cylinder during unlocking. The housing has an unlocking slot containing a main shaft and a secondary shaft, which are coaxially arranged. The top wall of the secondary shaft has a connecting hole, and the bottom wall of the main shaft has an insert shaft for insertion into the connecting hole and movably positioned within it along the axial direction of the connecting hole. Two guide portions are arranged opposite each other on the outer peripheral wall of the shaft. The top wall of the secondary shaft is provided with guide grooves corresponding to the two guide portions. The guide grooves are connected to the connecting holes. The two guide portions are movably disposed in their respective guide grooves. The inner wall of the guide groove is connected to the top wall of the secondary shaft with a smooth arc surface to form a guide surface. The bottom wall of the housing and the bottom wall of the secondary shaft are coaxially provided with slots for the insertion of the locking shaft. When the locking shaft rotates, it drives the secondary shaft to rotate synchronously, so that the guide portions are gradually raised along the opening direction of the guide surface to achieve contact between the top wall of the main shaft and the bottom wall of the guide rail, and the main shaft drives the guide rail to rise.

[0023] The advantages of adopting the above technical solution are: the detachable connection of the lock body facilitates the installation and maintenance of the manual unlocking structure; the main shaft and the secondary shaft cooperate through the insertion shaft, guide part and guide groove, so that when the lock shaft rotates and drives the secondary shaft to rotate, the guide part rises along the guide surface and drives the main shaft to lift the guide rail, thereby realizing manual unlocking. The above technical settings enable the unlocking function to be completed normally under special circumstances (such as power outage, damage to the fingerprint lock motor, etc.).

[0024] The present invention further comprises: the lock cylinder is movably disposed in the lock housing; when the lock cylinder slides in the lock housing along the length of the lock shaft, it drives the lock shaft to rise synchronously, so that the lock shaft drives the auxiliary shaft and the main shaft to perform a lifting motion.

[0025] The advantages of adopting the above technical solution are: In the above technology, the sliding of the lock cylinder in the lock case drives the lock shaft to rise synchronously, which in turn drives the auxiliary shaft and the main shaft to rise, enhancing the stability of power transmission during manual unlocking, ensuring that the main shaft can reliably lift the guide rail, and improving the linkage accuracy of each component during manual unlocking through the cooperation of lifting motion and rotation drive, ensuring the effective mating of the locking plate and the locking groove, improving the success rate of manual unlocking, thus adapting to different unlocking scenarios, enhancing the applicability and emergency capability of the clutch, and ensuring that users can unlock normally under various circumstances. Attached Figure Description

[0026] Figure 1 This is a three-dimensional view of the present invention;

[0027] Figure 2 This is a partial three-dimensional view of the present invention after the rear cover plate has been removed;

[0028] Figure 3 This is a partial three-dimensional view of the present invention after the shell has been removed;

[0029] Figure 4 for Figure 3 A partial 3D view;

[0030] Figure 5 This is a partially exploded three-dimensional view of the clutch structure in this utility model. Detailed Implementation

[0031] This utility model provides a motor clutch structure for a fingerprint lock resistant to forced entry, including a housing 1 for installation inside an external fingerprint lock and a clutch structure. The clutch structure includes an inner separating plate 2, an outer separating plate 3, and a connector 4 built into the housing 1. The outer separating plate 3 has a socket 31 for mating with an external handle connecting rod, and the connector 4 has a through hole 41 for mating with a square rod in the external fingerprint lock. A locking element is provided between the outer separating plate 3 and the inner separating plate 2 for engaging or disengaging the inner separating plate 2 and the connector 4. The clutch structure also includes a mechanism for engaging with the circuit module of the external fingerprint lock so that the locking element is driven when the external circuit module sends a command. A motor assembly is used to enable or decouple the inner separating plate 2 from the connector 4. The outer separating plate 3 is equipped with a limiting component for separating the inner separating plate 2 from the outer separating plate 3 when the outer handle is forcibly opened by an external user, allowing the inner separating plate 2 to rotate freely. The limiting component includes at least two locking plates 32 disposed on the inner wall of the outer separating plate 3. Each pair of locking plates 32 is positioned opposite each other and bent towards the outer wall of the inner separating plate 2. A slot 21 is provided on the inner separating plate 2 corresponding to each locking plate 32. Each locking plate 32 engages with its corresponding slot 21. The locking plates 32 and slots 21 are connected by stamping or welding. The limiting component also includes… The anti-breakage bolt 22 is connected to the inner separating plate 2. The housing 1 is detachably connected by a front cover plate 11 and a rear cover plate 12. A positioning groove 111 is provided on the front cover plate 11. The rod end of the anti-breakage bolt 22 is movably disposed in the positioning groove 111. The radial cross section of the positioning groove 111 is arc-shaped and the arc direction is consistent with the fan-shaped swing direction of the anti-breakage bolt 22. A return torsion spring 23 is provided on the inner separating plate 2. Both ends of the front cover plate 11 are bent with abutment parts 112. The return torsion spring 23 includes a coil part and two shaft parts. The two shaft parts are respectively abutted and cooperate with the two abutment parts 112. The coil part is connected to the inner separating plate 2. The bottom wall of the connector 4 is provided with a guide. The guide block 42 has a sliding groove 421. The locking element includes a locking piece 43 that is slidably disposed in the sliding groove 421. The inner separating piece 2 has a locking groove 24. The motor assembly and the locking piece 43 are linked and cooperate to achieve the insertion of the beginning end of the locking piece 43 into the locking groove 24 when the motor assembly operates and pushes the locking piece 43 upward. A return spring 422 is disposed in the sliding groove 421. The return spring 422 is a square spring and is sleeved on the locking piece 43. The end of the return spring 422 is connected to the inner peripheral wall of the locking groove 24, and the beginning end of the return spring 422 is connected to the end of the locking piece 43. The locking element also includes a guide rail 44.The guide rail 44 has an arc-shaped radial cross-section, and its top surface is a guide surface 441 for contacting the bottom wall of the guide block 42 to guide the guide block 42 when the connector 4 rotates and drives the guide block 42 to swing. A guide groove 442 is provided on the guide rail 44, and the radial cross-section of the guide groove 442 is arc-shaped, with the arc of the guide groove 442 consistent with the swing trajectory of the guide block 42. A locking piece 431 is bent at the bottom wall of the locking piece 43, and the locking piece 431 is arc-shaped and slides within the guide groove 442 along its opening direction. The motor assembly includes a housing 5, a drive motor 51 and a gear set 52 disposed inside the housing 5, and a lifting groove 5 is provided in the housing 5. 3. A lifting block 443 is connected to the bottom of the guide rail 44. The lifting block 443 is movably disposed in the lifting groove 53. The lifting block 443 is hollow and has a mating groove 444. An upper shaft 54 ​​and a lower shaft 55 are coaxially disposed in the lifting groove 53. The upper shaft 54 ​​and the lower shaft 55 are threadedly connected. The upper shaft 54 ​​and the lower shaft 55 pass through the lifting groove 53. The lower shaft 55 is connected to the output end of the drive motor 51 through a gear set 52. The outer peripheral wall of the upper shaft 54 ​​is provided with an abutment shaft 541 for abutting against the top wall of the lifting groove 53 when the lower shaft 55 rotates and drives the upper shaft 54 ​​to rise, so as to drive the lifting block 443 to move up and down along the opening direction of the lifting groove 53. It also includes a manual unlocking structure. The device also includes a manual unlocking structure, which comprises a lock shell 6 detachably connected to the bottom of an external fingerprint lock housing, a lock cylinder 61 for engaging with an external key to unlock or lock, and a lock shaft 62 that engages with the lock cylinder 61 to rotate synchronously when the lock cylinder 61 is unlocked. An unlocking slot 56 is provided in the housing 5, and a main shaft 57 and a secondary shaft 58 are provided in the unlocking slot 56. The main shaft 57 and the secondary shaft 58 are coaxially arranged. A connecting hole 581 is provided on the top wall of the secondary shaft 58, and an insertion shaft 571 is provided on the bottom wall of the main shaft 57 for inserting into the connecting hole 581 and movably disposed within the connecting hole 581 along its axial direction. Two guide portions 572 are provided opposite each other on the outer peripheral wall of the insertion shaft 571. The top wall of the secondary shaft 58 has guide grooves 582 corresponding to the two guide portions 572. These guide grooves 582 communicate with the connecting holes 581. Each guide portion 572 is movably disposed within its corresponding guide groove 582. The inner wall of the guide groove 582 is smoothly connected to the top wall of the secondary shaft 58, forming a guide surface 583. The bottom wall of the housing 5 and the bottom wall of the secondary shaft 58 are coaxially provided with slots 59 for the insertion of the locking shaft 62. When the locking shaft 62 rotates, it drives the secondary shaft 58 to rotate synchronously, causing the guide portions 572 to gradually rise along the direction of the guide surface 583. This allows the top wall of the main shaft 57 to contact the bottom wall of the guide rail 44, and the main shaft 57 to lift the guide rail 44. The lock cylinder 61 is movably disposed within the lock housing 6.When the lock cylinder 61 slides along the length of the lock shaft 62 within the lock housing 6, it causes the lock shaft 62 to rise synchronously, thereby causing the lock shaft 62 to drive the secondary shaft 58 and the main shaft 57 to perform a lifting motion.

[0032] Specific implementation process of this device:

[0033] I. Normal unlocking procedure:

[0034] 1. After the user completes identity verification through fingerprint or other means, the fingerprint lock's circuit module sends a start command to the motor assembly;

[0035] 2. When the motor assembly is running, the drive motor drives the lower shaft to rotate through the gear set. The upper shaft and the threaded connection between the lower shaft rise accordingly. The abutment shaft abuts against the top wall of the lifting groove and drives the lifting block to rise along the lifting groove, thereby pushing the guide rail to rise.

[0036] 3. When the guide rail is raised, the guide block swings along the guide rail guide surface, and the locking piece moves up with the guide block's slide groove. The beginning of the locking piece is inserted into the locking groove of the inner separating piece, realizing the linkage between the inner separating piece and the connector. At this time, the return spring is compressed.

[0037] 4. When the user rotates the outer handle, the connecting rod of the outer handle drives the outer separating plate to rotate through the insertion hole of the outer separating plate. The locking plate of the outer separating plate engages with the locking groove of the inner separating plate, and the power is transmitted to the inner separating plate, and then transmitted to the square rod of the lock body through the through hole of the connector, driving the lock body to complete the unlocking.

[0038] 5. After unlocking, the motor assembly stops running, the return spring drives the locking plate to move down the slide groove and disengage from the locking groove, the inner separating plate is released from the connector, and the inner separating plate returns to the initial position under the action of the return torsion spring, waiting for the next instruction.

[0039] II. Procedures for preventing forced entry:

[0040] 1. When the outer handle is forcibly opened by external force, the connecting rod of the outer handle applies an external force exceeding the normal torque to the outer separation plate through the socket;

[0041] 2. The clamping strength between the outer separator plate and the inner separator plate cannot withstand the violent torque, the clamp plate breaks, the inner separator plate separates from the outer separator plate, and the power transmission path is interrupted;

[0042] 3. When the outer separator plate continues to rotate under external force, the inner separator plate will spin freely due to loss of drive. The anti-breakage bolt will swing along the arc-shaped positioning groove of the front cover plate. The positioning groove restricts the excessive rotation of the inner separator plate to avoid damage to the components.

[0043] 4. The internal separation plate cannot transmit power to the lock body square rod through the connector when it is spinning freely, so the fingerprint lock body remains locked and forced entry fails.

[0044] 5. After the violent impact, the inner separator plate returns to its initial position under the action of the reset torsion spring. If the plate is not completely broken, it can be reset by the outer handle to re-engage the plate with the slot, and the clutch will return to normal working condition.

[0045] The connecting rod of the external handle described above is identified as 7 in the accompanying drawings.

[0046] In order to improve the installation compatibility and application range of the above technology with external fingerprint locks, the housing position can be selectively adjusted. Assuming that the motor position described in this technology is located on the left side of the housing and the slot position is located on the right side of the housing, the housing position can be adjusted according to actual needs so that the slot position and the motor position are swapped, thereby improving the installation compatibility and application range.

[0047] The external fingerprint lock described above is existing technology, which also includes modules such as control circuit, recognition circuit, and lock body. Since it is existing technology, its structure and function will not be described in detail.

[0048] In the above technology, to ensure that the upper shaft can move up and down along its axial direction when the lower shaft rotates, a horizontal plate can be provided in the mating groove. The horizontal plate has an opening for the upper shaft to pass through. The inner peripheral wall of the opening has a notch, and the through direction of the notch is parallel to the axial direction of the upper shaft. The outer peripheral wall of the upper shaft has a protrusion. The rotation limit of the upper shaft is achieved by the engagement of the protrusion and the notch. Since the lower shaft and the upper shaft are threadedly connected, the upper shaft tends to rotate synchronously when the lower shaft rotates. However, the upper shaft is limited by the engagement of the protrusion and the notch, so the upper shaft cannot rotate. Therefore, the upper shaft can only move up and down instead of rotating. The above principle is similar to the principle of screw drive, so its structure and principle will not be described in detail.

[0049] The aforementioned technologies can be optionally equipped with a manual unlocking structure according to actual needs, thereby expanding the scope of application of the device.

[0050] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A motor clutch structure for preventing a violent forced opening of a fingerprint lock, characterized by: The device includes a housing and a clutch structure for installation inside an external fingerprint lock. The clutch structure includes an inner separator plate, an outer separator plate, and a connector built into the housing. The outer separator plate has a socket for mating with an external handle connecting rod. The connector has a through hole for mating with a square rod in the external fingerprint lock. A locking element is provided between the outer separator plate and the inner separator plate to engage or disengage the inner separator plate from the connector. The clutch structure also includes a motor assembly for engaging with the circuit module of the external fingerprint lock so that when the external circuit module sends a command, it drives the locking element to engage or disengage the inner separator plate from the connector. The outer separator plate has a limiting component for separating the inner separator plate from the outer separator plate when an external user forcibly opens the external handle, thus allowing the inner separator plate to spin freely.

2. The motor clutch structure of a violence-resistant forced-opening fingerprint lock according to claim 1, characterized in that: The limiting component includes at least two locking plates disposed on the inner wall of the outer separating plate. Each pair of locking plates is disposed opposite to each other and bent toward the outer wall of the inner separating plate. The inner separating plate is provided with a slot corresponding to each locking plate position. Each locking plate is engaged with its corresponding slot. The locking plates and slots are connected by a stamping process or a welding process.

3. The motor clutch structure of a violence-resistant forced-entry-resistant fingerprint lock according to claim 2, characterized in that: The limiting component also includes an anti-breakage bolt connected to the inner separation plate. The housing is composed of a front cover plate and a rear cover plate that are detachably connected. A positioning groove is provided on the front cover plate. The rod end of the anti-breakage bolt is movably disposed in the positioning groove. The radial cross section of the positioning groove is arc-shaped and the arc direction is consistent with the fan-shaped swing direction of the anti-breakage bolt.

4. The motor clutch structure of a violence-resistant forced-entry-resistant fingerprint lock according to claim 3, characterized in that: The inner separating plate is provided with a reset torsion spring, and both ends of the front cover plate are bent with abutment parts. The reset torsion spring includes a coil part and two shaft parts. The two shaft parts are respectively abutted and cooperate with the two abutment parts. The coil part is connected to the inner separating plate.

5. The motor clutch structure of a violence-resistant forced-entry-resistant fingerprint lock according to claim 1, characterized in that: The connector bottom wall is provided with a guide block, and a sliding groove is provided on the guide block. The locking component includes a locking piece that is slidably disposed in the sliding groove. A locking groove is provided on the inner separating piece. The motor assembly and the locking piece are linked and cooperated to realize the insertion of the beginning end of the locking piece into the locking groove when the motor assembly is running and pushes the locking piece to lift.

6. The electric motor clutch structure of a violence-resistant forced-opening fingerprint lock according to claim 5, characterized in that: A return spring is provided in the slide groove. The return spring is a square spring and is sleeved on the locking piece. The end of the return spring is connected to the inner peripheral wall of the locking groove, and the beginning of the return spring is connected to the end of the locking piece.

7. The electric motor clutch structure of a violence-resistant forced-opening fingerprint lock according to claim 5, characterized in that: The locking component also includes a guide rail, the guide rail having an arc-shaped radial cross-section and its top surface being a guide surface for contacting the bottom wall of the guide block when the connector rotates and drives the guide block to swing, thereby guiding the swing of the guide block. A guide groove is provided on the guide rail, the guide groove having an arc-shaped radial cross-section and the arc of the guide groove being consistent with the swing trajectory of the guide block. A locking piece is bent at the bottom wall of the locking piece, the locking piece being arc-shaped and slidingly disposed in the guide groove along the opening direction of the guide groove.

8. The electric motor clutch structure of a violence-resistant forced-entry resistant fingerprint lock according to claim 7, wherein: The motor assembly includes a housing, a drive motor and a gear set disposed inside the housing. A lifting groove is provided in the housing. A lifting block is connected to the bottom of the guide rail. The lifting block is movably disposed in the lifting groove. The lifting block is hollow and has a mating groove. An upper shaft and a lower shaft are coaxially disposed in the lifting groove. The upper shaft and the lower shaft are threadedly connected. The upper shaft and the lower shaft pass through the lifting groove. The lower shaft is connected to the output end of the drive motor through the gear set. An abutment shaft is provided on the outer peripheral wall of the upper shaft for abutting against the top wall of the lifting groove when the lower shaft rotates and drives the upper shaft to rise, so as to drive the lifting block to move up and down along the opening direction of the lifting groove.

9. The motor clutch structure of a violence-resistant forced-entry-resistant fingerprint lock according to claim 8, characterized in that: It also includes a manual unlocking structure, which comprises a lock shell for detachable connection to the bottom of an external fingerprint lock housing, a lock cylinder for cooperating with an external key to unlock or lock, and a lock shaft for linkage with the lock cylinder to rotate synchronously when the lock cylinder unlocks. The housing has an unlocking slot containing a main shaft and a secondary shaft, which are coaxially arranged. The top wall of the secondary shaft has a connecting hole, and the bottom wall of the main shaft has an insert shaft for insertion into the connecting hole and movably disposed within the connecting hole along its axial direction. Two guide portions are arranged opposite each other on the outer peripheral wall. The top wall of the secondary shaft is provided with guide grooves corresponding to the two guide portions. The guide grooves are connected to the connecting holes. The two guide portions are movably disposed in their respective guide grooves. The inner wall of the guide groove is connected to the top wall of the secondary shaft with a smooth arc surface to form a guide surface. The bottom wall of the housing and the bottom wall of the secondary shaft are coaxially provided with slots for the insertion of the locking shaft. When the locking shaft rotates, it drives the secondary shaft to rotate synchronously, so that the guide portions are gradually raised along the opening direction of the guide surface to achieve contact between the top wall of the main shaft and the bottom wall of the guide rail, and the main shaft drives the guide rail to rise.

10. The motor clutch structure of a violence-resistant forced-entry-resistant fingerprint lock according to claim 9, wherein: The lock cylinder is movably disposed in the lock case. When the lock cylinder slides in the lock case along the length of the lock shaft, it drives the lock shaft to rise synchronously, so that the lock shaft drives the secondary shaft and the main shaft to perform a lifting motion.

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