Unlocking mechanism and intelligent lock using the same

Abstract

The present invention discloses an unlocking mechanism and an intelligent lock using the unlocking mechanism, wherein the unlocking mechanism is used to cooperate with a lock hook that can move between a locked position and an unlocked position to realize unlocking; the lock hook is provided with a first limit groove; the unlocking mechanism comprises a lock tongue mechanism, a limit mechanism and a driving mechanism; the lock tongue mechanism comprises a lock tongue and a lever structure that drives the lock tongue to rotate between an engaged position and an unengaged position by rotation; when the lock hook is in the unlocked position, the limit mechanism is rotated from the first limit position to the second limit position under the friction transmission of the driving mechanism; when the lock hook is in the locked position, the limit mechanism is reset to the first limit position from the second limit position; the unlocking mechanism reduces the unlocking force required to be output by the driving mechanism to rotate the limit mechanism when unlocking by arranging a friction transmission between the driving mechanism and the limit mechanism and setting a transmission ratio of the friction pair.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to an unlocking mechanism and a smart lock using the unlocking mechanism. Background Art

[0002] Smart locks are different from traditional mechanical locks and are more intelligent in terms of user identification, security, and management. The sign of smart locks is whether they can be remotely controlled by mobile phones and linked with smart homes. Smart locks are often used as lock control applications for security and process control. Their application areas are very wide, such as lock control for power supply boxes for key urban public facilities, outdoor distribution cabinets for distribution networks, substation mechanism boxes, and power metering boxes; as well as lock control for packaging, carriages, and containers used in logistics; and lock control for oil and gas pipeline valves and commercial coal sample confidentiality containers used for material management.

[0003] At present, smart locks on the market are roughly divided into two types: (1) smart locks based on Bluetooth technology; (2) smart locks based on NFC technology. Smart locks based on Bluetooth technology generally use built-in batteries or handheld devices for power supply, and their lifespan and reliability are usually not ideal. In addition, handheld power supply is inconvenient to use. Smart locks based on NFC technology have obvious advantages in environments with complex power supply because they do not require power supply maintenance. However, they have low power consumption and limited convertible torque, which leads to problems such as insufficient unlocking force, unlocking stroke, and unlocking force.

[0004] In order to solve the problem of small unlocking force, insufficient unlocking stroke and unlocking force of smart locks based on NFC technology, technicians in this field have achieved this by reducing the elastic coefficient of the relevant springs used for unlocking. However, they found that when used outdoors or in a vibrating environment, the smart lock can easily open automatically, posing a big security problem. Summary of the invention

[0005] The first object of the present invention is to provide a unlocking mechanism, which reduces the unlocking force required by the driving mechanism to rotate the limit mechanism when unlocking, and reduces the risk of the smart lock automatically opening in a vibrating environment.

[0006] Risk, improve the security of smart locks.

[0007] In order to achieve the first object of the present invention, the present invention adopts the following technical solution:

[0008] When the lock hook is in the locked position, the lock tongue is driven by the lever structure to rotate to the first limit position, and the limit mechanism is rotated from the second limit position to the second limit position under the friction transmission of the driving mechanism, thereby providing a space for the lever structure to rotate; when the lock hook is in the locked position, the lock tongue is driven by the lever structure to rotate to the engaged position and engage in the first limit groove, and the limit mechanism is reset from the second limit position to the first limit position to limit the lever structure.

[0009] As a specific implementation, the lever structure includes a rotating fulcrum and a power part and a resistance part that can rotate around the rotating fulcrum; the power part drives the lock tongue and the resistance part to rotate by moving up and down; the resistance part cooperates with the limiting mechanism to limit the lock tongue mechanism; when the lock hook is in the locked position, the power part moves downward under the action of power, driving the lock tongue and the resistance part to rotate in the counterclockwise direction, the lock tongue is stuck in the first limiting groove, and the resistance part abuts against the limiting mechanism that is reset to the first limiting position; when the lock hook is in the unlocked position, the power part moves upward under the action of power, driving the lock tongue and the resistance part to rotate in the clockwise direction, the lock tongue moves out of the first limiting groove, and the resistance part abuts against the limiting mechanism that is rotated to the second limiting position.

[0010] Furthermore, when the lock hook is in the locked position, the power part moves downward under the pressure of the lock hook and squeezes an elastic element, driving the lock tongue and the resistance part to rotate in the counterclockwise direction; when the lock hook is in the unlocked position, the power part moves upward under the elastic force of the elastic element, driving the lock tongue and the resistance part to rotate in the clockwise direction.

[0011] Furthermore, the locking tongue mechanism also includes a first reset torsion spring; the first reset torsion spring is sleeved on the rotation fulcrum and is used to apply a clockwise force to the lever structure.

[0012] Furthermore, a second limiting groove is provided on the locking hook; and the power unit is arranged on the locking hook through the second limiting groove.

[0013] Furthermore, the contact point between the power part and the locking hook is an arc section, and the range of the arc section angle θ of the contact point is 0<θ<90°; the range of the length ratio L1 / L2 of the power part and the resistance part is 0<L1 / L2<1; the range of the friction coefficient μ between the resistance part and the second limiting part is 0<μ<1.

[0014] As a specific implementation, the arc section angle θ of the contact point between the power part and the lock hook is 30°; the length ratio L1:L2 of the power part and the resistance part is 1:2; the friction coefficient μ between the resistance part and the second limiting part is 0.5.

[0015] As a specific embodiment, the driving mechanism includes an electric driving element and a main friction transmission part that can rotate under the drive of the electric driving element; the limiting mechanism includes a rotating shaft, a second reset torsion spring sleeved on the rotating shaft, a slave friction transmission part connected to the rotating shaft, at least a first limiting part and at least a second limiting part that is recessed inward compared to the first limiting part; the slave friction transmission part rotates under the friction transmission of the main friction transmission part, and the limiting mechanism is rotated to the second limiting position, and the second limiting part is rotated toward the lever structure to provide space for the lever structure to rotate, or the limiting mechanism is reset to the first limiting position under the action of the second reset torsion spring, and the first limiting part is rotated toward the lever structure to limit the lever structure.

[0016] As a specific implementation, the outer wall surface of the first limiting portion adopts the outer side surface of the sector-shaped cylinder, and the second limiting portion is a groove that is recessed inwardly relative to the outer wall surface of the sector-shaped cylinder.

[0017] As a specific implementation, the inner wall surface of the groove includes an inner top plane, a left plane and a right plane located on both sides of the inner top plane, and a connecting curved surface smoothly connecting the left plane and the right plane.

[0018] As a specific implementation, the outer wall surface of the slave friction transmission part along the circumferential direction is a cylindrical surface; the main friction transmission part is assembled on the output shaft of the electric drive element and can rotate under the drive of the electric drive element; the main friction transmission part is provided with at least two protrusions at intervals along the circumferential direction, and the outer wall surface of the protrusion has a sector-shaped cylindrical surface for forming a friction pair with the cylindrical surface.

[0019] Furthermore, a transmission ratio N1 / N2 of a friction pair formed by a slave friction transmission part of the limiting mechanism and a main friction transmission part of the driving mechanism is in a range of (N1 / N2)>1.

[0020] As a specific implementation, the transmission ratio of the friction pair formed by the slave friction transmission part of the limiting mechanism and the main friction transmission part of the driving mechanism is N1:N2=1:0.9.

[0021] The second purpose of the present invention is to provide a smart lock that adopts the above-mentioned unlocking mechanism, thereby reducing the unlocking force required to be output by the driving mechanism to rotate the limiting mechanism when unlocking, reducing the risk of the smart lock automatically opening in a vibration environment, and improving the safety of the smart lock.

[0022] In order to achieve the second purpose of the present invention, the present invention adopts the following technical solution:

[0023] A smart lock comprises the above-mentioned unlocking mechanism and the lock hook cooperating with the unlocking lock; it also comprises a lock body and a circuit module; the circuit module is electrically connected to the driving mechanism for controlling the action of the driving mechanism; the lock body is used to provide a storage space for accommodating the unlocking mechanism and the circuit module.

[0024] Beneficial effects of the present invention:

[0025] The unlocking mechanism and the smart lock using the unlocking mechanism provided by the present invention reduce the unlocking force required for the driving mechanism to rotate the limiting mechanism when unlocking by arranging a friction transmission between the driving mechanism and the limiting mechanism and setting the transmission ratio of the friction pair; at the same time, by arranging a lever structure in the lock tongue mechanism, the length of the power part is made smaller than the length of the resistance part, thereby increasing the power required for unlocking, reducing the risk of the smart lock automatically opening in a vibration environment, and improving the safety of the smart lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a cross-sectional schematic diagram of a smart lock provided by an embodiment of the present invention;

[0028] Figure 2 is a three-dimensional schematic diagram of the unlocking mechanism and the lock hook provided in an embodiment of the present invention (the lock hook is in the locked position);

[0029] Figure 3 It is another stereoscopic schematic diagram of the unlocking lock mechanism and the lock hook provided in an embodiment of the present invention (the lock hook is in the unlocking position). DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0031] As shown in this specification and claims, the terms "comprises" and "includes" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0032] It should be noted that, unless otherwise specified, when a feature is referred to as being "connected" to another feature, it may be directly connected to the other feature, or may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0033] like Figures 1 to 3 As shown, a smart lock includes a lock body 1, a lock hook 2, a lock release mechanism and a circuit module 4; the lock body 1 includes a lock shell 11 and a mounting seat 12 located in the lock shell 11. The lock body 1 in this embodiment adopts a split structure, and the lock shell 11 can be made of a relatively hard metal material to reduce the risk of damaging the smart lock from the outside; the mounting seat 12 can be made of plastic material to facilitate processing various mounting holes / slots on the mounting seat 12, so as to facilitate the installation of various components inside the smart lock.

[0034] like Figure 2 , 3, the lock hook 2 can move back and forth between the locked position and the unlocked position, and the lock hook 2 includes a lock hook connection end 21 limited in the lock body 1 and a lock hook free end 22 that can be inserted into or out of the lock hole at the upper end of the lock body 1. The lock hook connection end 21 is provided with a first limiting groove 211 and a second limiting groove 212.

[0035] like Figures 1 to 3As shown, the unlocking mechanism includes a lock tongue mechanism 31, a limiting mechanism 32 and a driving mechanism 33; the lock tongue mechanism 31 is rotatably arranged in the mounting seat 12, including a lock tongue 311 and a lever structure 312 connected to the lock tongue 311 and driving the lock tongue 311 to rotate between an engaged position and an unengaged position by rotation; the lever structure 312 rotates counterclockwise to drive the lock tongue 311 to the engaged position and snaps into the first limiting groove 211; the lever structure 312 rotates clockwise to drive the lock tongue 311 to the unengaged position and move out of the first limiting groove 211; the limiting mechanism 32 is rotatably arranged in the mounting seat 12, and when the driving mechanism 33 is engaged, the lock tongue 311 is driven to rotate between the engaged position and the unengaged position. The driving mechanism 33 is frictionally driven to rotate from the first limit position to the second limit position to provide a space for the lever structure 312 to rotate clockwise, and when the lock hook 2 moves to the unlocking position (the lock tongue 311 moves out of the first limit groove 211), the lever structure 312 is limited to restrict the lever structure 312 from continuing to rotate in the clockwise direction, or, when the lever structure 312 rotates in the counterclockwise direction, it is reset from the second limit position to the first limit position, and when the lock hook 2 moves to the locking position (the lock tongue 311 is inserted into the first limit groove 211), the lever structure 312 is limited to restrict the lever structure 312 from continuing to rotate in the counterclockwise direction.

[0036] In this embodiment, the smart lock reduces the unlocking force required by the driving mechanism 33 to rotate the limiting mechanism 32 when unlocking by setting a friction transmission between the driving mechanism 33 and the limiting mechanism 32 and setting the transmission ratio of the friction pair; at the same time, by setting a lever structure 312 in the lock tongue mechanism 31, the length of the power part 3122 is made smaller than the length of the resistance part 3123, thereby increasing the power required for unlocking, reducing the risk of the smart lock automatically opening in a vibration environment, and improving the safety of the smart lock.

[0037] like Figures 1 to 3As shown, the lever structure 312 includes a rotation fulcrum 3121 and a power part 3122 and a resistance part 3123 that can rotate around the rotation fulcrum 3121; the power part 3122 drives the lock tongue 311 and the resistance part 3123 to rotate around the rotation fulcrum 3121 by moving up and down; the resistance part 3123 cooperates with the limiting mechanism 32 to limit the lock tongue mechanism 32; when the lock hook 2 moves from the locked position to the unlocked position, the power part 3122 moves upward under the action of the power, driving the lock tongue 311 and the resistance part 3123 to rotate clockwise When the lock hook 2 moves from the unlocked position to the locked position, the power part 3122 moves downward under the action of the power, driving the lock tongue 311 and the resistance part 3123 to rotate in the counterclockwise direction, the lock tongue 311 is engaged with the limiting groove 211, the resistance part 3123 is rotated out from the limiting mechanism 32 located at the second limiting position, and the limiting mechanism 32 is reset to the first limiting position to limit the resistance part 3123.

[0038] like Figure 2 As shown in Figure 3, the second limiting groove 212 is an annular groove arranged in an annular shape on the lock hook connecting end 21, and the power part 3122 is forked on the lock hook connecting end 21 through the second limiting groove 212, and moves up and down along the axial direction of the lock hook connecting end 21; as a specific implementation, one end of the power part 3122 that cooperates with the second limiting groove 212 includes two fork arms 3124 and a fork opening 3125 located between the two fork arms 3124, and the two fork arms 3124 are forked at the lock hook connecting end 21 corresponding to the second limiting groove 212 through the fork opening 3125.

[0039] When the smart lock needs to be locked, the lock hook 2 is pressed downward, the lock hook connecting end 21 moves downward, and the power part 3122 moves downward under the pressure of the lock hook connecting end 21, squeezing the elastic element (not shown in the figure, as a specific implementation, the elastic element adopts a spring, that is, the main spring for unlocking) located below the lock hook connecting end 21, driving the lock tongue 311 and the resistance part 3123 to rotate counterclockwise, the lock tongue 311 is stuck in the first limiting groove 211, and the resistance part 3123 is rotated out from the limiting mechanism 32 located at the second limiting position, and the limiting mechanism 32 is reset to the first limiting position. A limit position; when the smart lock needs to be unlocked, the circuit module 4 outputs a driving signal to the driving mechanism 33, and the driving mechanism 33 drives the limit mechanism 32 from the first limit position to the second limit position through friction transmission, providing space for the resistance part 3123 to rotate clockwise, and the power part 3122 moves upward under the action of the elastic restoring force of the elastic element, driving the lock tongue 311 and the resistance part 3123 to rotate in a clockwise direction, and the lock tongue 311 moves out of the first limit groove 211, and the resistance part 3123 is stuck in the limit mechanism 32 rotated to the second limit position.

[0040] like Figures 1 to 3 As shown, the lock tongue mechanism 31 also includes a first return torsion spring 313, which is mounted on the rotating fulcrum 3121 and is used to provide a clockwise force to the lever structure 312. That is, when the smart lock needs to be unlocked, the power part 3122 moves upward under the combined action of the elastic restoring force of the elastic element and the clockwise force of the first return torsion spring 313, thereby accelerating the unlocking speed and saving the unlocking time.

[0041] like Figures 1 to 3 As shown, the driving mechanism 33 includes an electric driving element 331 (in this embodiment, the electric driving element 331 is a motor) and a main friction transmission part 332, and the main friction transmission part 332 is assembled on the output shaft of the electric driving element 331; the electric driving element 331 is electrically connected to the circuit module 4, and can drive the main friction transmission part 332 to rotate under the control of the circuit module 4; the limiting mechanism 32 is rotatably arranged in the mounting seat 12, including a rotating shaft 321, a second reset torsion spring 325 sleeved on the rotating shaft 321, and a secondary friction transmission part 322 connected to the rotating shaft 321, at least one first limiting part 323 and at least one second limiting part 324 which is recessed inwardly compared to the first limiting part 323 along the radial direction of the rotating shaft 321.

[0042] As a specific implementation, in this embodiment, the number of the first limiting parts 323 and the second limiting parts 324 are both two, and the two first limiting parts 323 and the two second limiting parts 324 are arranged at intervals along the circumference of the rotating shaft 321; the slave friction transmission part 322 is located above the first limiting part 323 and the second limiting part 324, and rotates under the friction transmission of the main friction transmission part 332, driving the second limiting part 324 of the limiting mechanism 32 to turn to the resistance part 3123 (the limiting mechanism 32 turns to the second limiting position), and the second limiting part 324 provides the resistance part 3123 with space for clockwise rotation for unlocking, or the limiting mechanism 32 is reset under the action of the second reset torsion spring 325 (the limiting mechanism 32 is reset to the first limiting position), and the first limiting part 323 is turned to the resistance part 3123, and the resistance part 3123 is limited by the first limiting part 323.

[0043] like Figure 2 As shown in FIG. 3, the main friction transmission part 332 is provided with at least two protrusions 3321 (in the present embodiment, the number of the protrusions 3321 is two) at intervals along the circumferential direction, and the side surface of the protrusion 3321 close to one end of the slave friction transmission part 322 includes a sector-shaped cylindrical surface; the outer wall surface of the slave friction transmission part 322 along the circumferential direction includes a cylindrical surface 3221 for forming a friction pair with the sector-shaped cylindrical surface of the protrusion 3321; when the main friction transmission part 332 is driven by the electric drive element 331 to rotate, and the sector-shaped cylindrical surface of the protrusion 3321 is brought into friction contact with the cylindrical surface 3221 of the slave friction transmission part 322, the protrusion 3321 drives the slave friction transmission part 322 to rotate through the friction transmission.

[0044] In this embodiment, the main friction transmission part 332 is provided with multiple protrusions 3321 to perform friction transmission with the slave friction transmission part 322, thereby shortening the idling time of the main friction transmission part 332 when the smart lock is unlocked (because as long as one protrusion 3321 is in contact with the slave friction transmission part 322, friction transmission can be performed on the slave friction transmission part 322). Specifically, the unlocking time of multiple protrusions 3321 is 1 / N of that of one protrusion 3321 (N is the number of protrusions 3321), thereby shortening the unlocking response time and improving the user experience.

[0045] In this embodiment, the cross section of the limiting mechanism 32 is a circular symmetrical structure, for example, the two first limiting portions 323 are symmetrical to each other, and the two second limiting portions 324 are symmetrical to each other, which further reduces automatic unlocking in a vibration environment.

[0046] like Figure 2As shown in FIG. 3 , the outer wall surface of the first limiting portion 323 is the outer side surface of a sector-shaped cylinder, and the second limiting portion 324 is a groove that is recessed inward relative to the outer wall surface of the sector-shaped cylinder. The inner wall surface of the groove includes an inner top plane, a left plane and a right plane on both sides of the inner top plane, and a connecting curved surface that smoothly connects the left plane and the right plane.

[0047] like Figure 1 As shown, the smart lock also includes a first sensor 51 for detecting the movement of the lock hook 2 and a second sensor 52 for detecting the movement of the protrusion 3321 on the main friction transmission part 332.

[0048] In this embodiment, the operation process of unlocking the smart lock is as follows:

[0049] When the smart lock is in a locked state, that is, the lock hook 2 is in the locked position, the power part 3122 is located at the lower end of the second limiting groove 212 under the pressure of the lock hook connecting end 21, squeezing the elastic element below the lock hook connecting end 21, and the lock tongue 311 is stuck in the first limiting groove 211. The resistance part 3123 is reset to the first limiting position. The first limiting part 323 of the limiting mechanism 32 limits the rotation; when the smart lock needs to be unlocked, the NFC card reader (such as a mobile phone, PAD, iPAD, etc. with an NFC module) The mobile terminal) provides energy to the circuit module 4, and the circuit module 4 outputs a control signal to the electric drive element 331, and the electric drive element 331 drives the main friction transmission part 332 to rotate. When the protrusion 3321 of the main friction transmission part 332 turns to contact with the slave friction transmission part 322, the main friction transmission part 332 drives the slave friction transmission part 322 to rotate through friction transmission, driving the limiting mechanism 32 to turn from the first limiting position to the second limiting position, and the second limiting part 324 faces the resistance part 3123, which is the resistance part 3123. The lock hook 312 is pressed downwardly to release the first locking cam 314, and the lock hook 312 is pressed downwardly to release the first locking cam 314. The lock hook 312 is pressed downwardly to release the first locking cam 314, and the lock hook 31 is pressed downwardly to release the first locking cam 314. The force portion 3122 moves downward, squeezing the elastic element below the lock hook connection end 21. The power portion 3122 drives the lock tongue 311 and the resistance portion 3123 to rotate counterclockwise. The lock tongue 311 is inserted into the first limiting groove 211. The resistance portion 3123 is rotated out of the limiting mechanism 32 (i.e., the groove) located at the second limiting position. The limiting mechanism 32 is reset to the first limiting position under the action of the restoring force of the second reset torsion spring 325. The first limiting portion 323 faces the resistance portion 3123 to limit the resistance portion 3123.

[0050] As a specific implementation, the contact point between the fork 3125 of the lever structure 312 and the lock hook connection end 21 is an arc section, and the range of the arc section angle θ of the contact point is 0<θ<90° (as a specific implementation, θ=30°), and the length ratio L1 / L2 of the power part 3122 of the lever structure 312 and the length L2 of the resistance part 3123 of the lever structure 312 is 0<(L1 / L2)<1 (as a specific implementation, L1:L2=1:2, that is, the power part 3122 The length L1 is equal to half of the length L2 of the resistance part 3123), the contact point between the resistance part 3123 of the lever structure 312 and the second limiting part 324 adopts cylindrical surface contact, the friction coefficient μ is in the range of 0<μ<1 (as a specific implementation, μ=0.5), and the transmission ratio N1 / N2 of the friction pair formed by the slave friction transmission part 322 of the limiting mechanism 32 and the main friction transmission part 332 of the driving mechanism 33 is in the range of N1 / N2>1 (as a specific implementation, N1:N2=1:0.9).

[0051] In this embodiment, it is assumed that the elastic force of the elastic element, i.e., the main unlocking spring, when unlocking is F, and after F is decomposed, the force F1=F*sinθ provided to the power part 3122 is the force F2=F*sinθ*(L1 / L2) transmitted to the resistance part 3123 of the lever structure 312 by the power part 3122 of the lever structure 312, and the force F3=μ* F2=μ*F*sinθ*(L1 / L2) transmitted to the second limiting part 324 of the limiting mechanism 32 by the resistance part 3123 of the lever structure 312 through friction is F3=μ* F2=μ*F*sinθ*(L1 / L2), and the unlocking force F4=(N2 / N1)*F3=(N2 / N1)*μ* F*sinθ*(L1 / L2)=0.1125*F is required for the main friction transmission part 332 of the driving mechanism 33 to drive the slave friction transmission part 322 of the limiting mechanism 32 to rotate.

[0052] In this embodiment, the smart lock reduces the unlocking force required by the driving mechanism 33 to rotate the limiting mechanism 32 when unlocking by setting a friction transmission between the driving mechanism 33 and the limiting mechanism 32 and setting the transmission ratio of the friction pair; at the same time, by setting a lever structure 312 in the lock tongue mechanism 31, the length of the power part 3122 is made smaller than the length of the resistance part 3123, thereby increasing the power required for unlocking, reducing the risk of the smart lock automatically opening in a vibration environment, and improving the safety of the smart lock.

[0053] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An unlocking mechanism, used to cooperate with a lock hook to achieve unlocking; the lock hook is provided with a first limiting groove, which can move between a locked position and an unlocked position; Features: The unlocking mechanism comprises a locking tongue mechanism, a limiting mechanism and a driving mechanism; the locking tongue mechanism comprises a locking tongue and a lever structure which drives the locking tongue to rotate between an engaged position and an unengaged position by rotation; when the lock hook is in the unlocking position, the locking tongue is driven by the lever structure to rotate to the unengaged position and moves out of the first limiting groove, and the limiting mechanism is driven by the friction transmission of the driving mechanism to rotate from the first limiting position to the second limiting position to provide a space for the lever structure to rotate; when the lock hook is in the locking position, the locking tongue is driven by the lever structure to rotate to the engaged position and is locked into the first limiting groove, and the limiting mechanism is reset from the second limiting position to the first limiting position to limit the lever structure; The driving mechanism includes a main friction transmission part that rotates under drive; the limiting mechanism includes a rotating shaft, a second reset torsion spring sleeved on the rotating shaft, a slave friction transmission part connected to the rotating shaft, at least a first limiting part and at least a second limiting part that is recessed inward compared to the first limiting part; the slave friction transmission part rotates under the friction transmission of the main friction transmission part, and the limiting mechanism is turned to the second limiting position, and the second limiting part is turned toward the lever structure to provide rotation space for the lever structure, or the limiting mechanism is reset to the first limiting position under the action of the second reset torsion spring, and the first limiting part is turned toward the lever structure to limit the lever structure.

2. The unlocking mechanism according to claim 1, characterized in that: The lever structure includes a rotating fulcrum and a power part and a resistance part that can rotate around the rotating fulcrum; the power part drives the lock tongue and the resistance part to rotate by moving up and down; the resistance part cooperates with the limiting mechanism to limit the lock tongue mechanism; when the lock hook is in the locked position, the power part moves downward under the action of power, drives the lock tongue and the resistance part to rotate in the counterclockwise direction, the lock tongue is stuck in the first limiting groove, and the resistance part abuts against the limiting mechanism that is reset to the first limiting position; when the lock hook is in the unlocked position, the power part moves upward under the action of power, drives the lock tongue and the resistance part to rotate in the clockwise direction, the lock tongue moves out of the first limiting groove, and the resistance part abuts against the limiting mechanism that is rotated to the second limiting position.

3. The unlocking mechanism according to claim 2, characterized in that: When the lock hook is in the locked position, the power part moves downward under the pressure of the lock hook and squeezes an elastic element, driving the lock tongue and the resistance part to rotate in the counterclockwise direction; when the lock hook is in the unlocked position, the power part moves upward under the elastic force of the elastic element, driving the lock tongue and the resistance part to rotate in the clockwise direction.

4. The unlocking mechanism according to claim 3, characterized in that: The locking tongue mechanism also includes a first reset torsion spring; the first reset torsion spring is sleeved on the rotation fulcrum and is used to apply a clockwise force to the lever structure.

5. The unlocking mechanism according to claim 2, characterized in that: The contact point between the power part and the lock hook is an arc section, and the range of the arc section angle θ of the contact point is 0<θ<90°; the range of the length ratio L1 / L2 between the power part and the resistance part is 0<L1 / L2<1; the range of the friction coefficient μ between the resistance part and the second limiting part is 0<μ<1.

6. The unlocking mechanism according to claim 1, characterized in that: The outer wall surface of the first limiting portion is the outer side surface of a sector-shaped cylinder, and the second limiting portion is a groove that is recessed inwardly relative to the outer wall surface of the sector-shaped cylinder.

7. The unlocking mechanism according to claim 1, characterized in that: The outer wall surface of the slave friction transmission part along the circumferential direction is a cylindrical surface; the main friction transmission part is provided with at least two protrusions at intervals along the circumferential direction, and the outer wall surface of the protrusion has a sector-shaped cylindrical surface for forming a friction pair with the cylindrical surface.

8. The unlocking mechanism according to claim 7, characterized in that: The transmission ratio N1 / N2 of the friction pair formed by the slave friction transmission part of the limiting mechanism and the main friction transmission part of the driving mechanism is in the range of (N1 / N2)>1.

9. A smart lock, characterized in that: It comprises the unlocking lock mechanism as described in any one of claims 1 to 8 and the lock hook cooperating with the unlocking lock; it also comprises a lock body and a circuit module; the circuit module is electrically connected to the driving mechanism for controlling the action of the driving mechanism; the lock body is used to provide a storage space for accommodating the unlocking lock mechanism and the circuit module.

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