Side-knock resistant lock

Abstract

The anti-side-knocking lock provided by the utility model comprises a lock tongue, a rotor and a first reset part; the rotor rotates around a first axis, and the rotor is provided with an eccentric part; the lock tongue can reciprocate along a second direction, the lock tongue is provided with a first buckling position, the reset part cooperates with the lock tongue, the eccentric part cooperates with the first buckling position, and when the rotor rotates, the eccentric part forces the lock tongue to move towards a second position; the utility model further comprises an anti-side-knocking part and a second reset part; the anti-side-knocking part can reciprocate along a first direction, and further comprises a cylindrical cam, the cylindrical cam is coaxial transmission with the rotor, the cylindrical cam idles for a first angle first and then drives the rotor to rotate; the driven part of the anti-side-knocking part abuts against the cam part; when the cylindrical cam rotates, the anti-side-knocking part is forced to move from a third position to a fourth position; the anti-side-knocking part in the third position buckles with the second buckling position of the lock tongue; the anti-side-knocking part in the fourth position is separated from the second buckling position. The utility model reduces manufacturing difficulty, guarantees part strength and is suitable for the lock type of the middle keyhole.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, specifically to an anti-side-knock lock. Background Technology

[0002] Chinese utility model patent CN114991594A discloses an anti-side-knock lock. The anti-side-knock lock includes a lock body, a rotor structure, a bolt, a first pin, and a second pin. The rotor structure includes a rotor body and a sliding component that can slide axially on the rotor body. The lock body has a first pin hole, and the bolt has a second pin hole. The sliding component can move axially when pushed by a key. When the anti-side-knock lock is in the aligned state, the sliding component is in the second position, and the first and second pins are respectively located within the first and second pin holes, allowing the eccentric body to push the bolt. When the anti-side-knock lock is in the misaligned state, the bolt is in the engaged position, the first and second pin holes and the sliding space are sequentially connected, the sliding component is in the first position, and at least a portion of the first pin enters the second pin, restricting the movement of the bolt, thereby achieving anti-side-knock protection.

[0003] The problem with existing anti-side-knock locks is that this anti-side-knock structure is only applicable to locks with the keyhole on one side. Furthermore, the rotor body of the rotor structure serves as the unlocking component of the lock, and the sliding component of the rotor structure serves as the anti-side-knock component. The unlocking component and the anti-side-knock component are integrated into one unit, which makes the component structure relatively complex, increases the weakening of the component strength, and requires high precision from the unlocking component, the anti-side-knock component, and multiple related components, making the manufacturing process more difficult. Utility Model Content

[0004] The primary objective of this invention is to provide a side-knocking lock that reduces manufacturing difficulty, ensures component strength, and is applicable to lock types with a central keyhole.

[0005] This utility model provides an anti-side-knock lock comprising a bolt, a rotor, and a first reset member; the rotor rotates around a first axis extending in a first direction, and the rotor is provided with an eccentric portion relative to the first axis; the bolt is configured to reciprocate along a second direction, and the bolt is provided with a first engagement position; the reset member cooperates with the bolt, and under the restoring force of the first reset member, the bolt tends to move towards the first position; the eccentric portion cooperates with the first engagement position, and when the rotor rotates, the eccentric portion forces the bolt to move towards the second position; it also includes an anti-side-knock member and a second reset member; the anti-side-knock member is configured to reciprocate along the first direction, and under the restoring force of the second reset member, the anti-side-knock member tends to move towards a third position. The mechanism includes a cylindrical cam, which includes a cam portion facing away from the latch in a first direction. The cylindrical cam is coaxially driven with the rotor, and the cylindrical cam and rotor are configured such that the cylindrical cam first idles at a first angle and then drives the rotor to rotate. The anti-side-knock component includes a driven portion that abuts against the cam portion. During the rotation of the cylindrical cam at the first angle, the cam portion forces the anti-side-knock component to move from the third position to the fourth position. The latch also includes a second engagement position, where the anti-side-knock component in the third position engages with the second engagement position of the latch in the second position to restrict the movement of the latch in a second direction. The anti-side-knock component in the fourth position disengages from the second engagement position.

[0006] As can be seen from the above scheme, under this configuration, when the key drives the lock cylinder to rotate, the cylindrical cam first idles and drives the anti-knock component to disengage from the bolt. Then, the cylindrical cam drives the rotor to rotate and push the bolt to move to unlock. In the locked state, the anti-knock component can lock the bolt position to achieve the anti-knock effect. Mainly, since the lock cylinder assembly and the anti-knock component are arranged separately along the second direction rather than centrally, the lock cylinder assembly, including the rotor and cylindrical cam, can be located in the middle of the lock body, while the anti-knock component, including the anti-knock component and the second reset component, can be located on the side of the lock body. This configuration is suitable for lock types with a central keyhole. Furthermore, under this configuration, both the lock cylinder assembly and the anti-knock component use simpler structural parts. The cylindrical cam, anti-knock component, and other parts are easier to process, reducing manufacturing difficulty and cost.

[0007] A further proposed solution is to have a first abutment part on the cylindrical cam and a second abutment part on the rotor. During the rotation of the cylindrical cam at a first angle, the first abutment part gradually approaches the second abutment part. After the cylindrical cam has rotated through the first angle, the first abutment part and the second abutment part abut against each other so that the cylindrical cam and the rotor can be driven together.

[0008] As can be seen from the above, when the first abutting part does not abut the second abutting part, the cylindrical cam rotates freely; when the first abutting part abuts the second abutting part, it can drive the rotor to rotate. This setting achieves delayed start of rotor rotation, satisfying the action requirement of this utility model to first release the anti-side knock and then unlock.

[0009] A further proposed solution is to have a protruding post on the cylindrical cam, with the first abutting part being the outer circumferential surface of the protruding post; a slot on the rotor, with the second abutting part being the inner wall surface of the slot; and the protruding post being able to move within the slot.

[0010] As can be seen from the above, this configuration makes the cylindrical cam and the rotor fit together more tightly, and the transmission between them is more stable.

[0011] A further proposed solution is that the cylindrical cam includes a cam portion that abuts against the driven portion, and the angle through which the cam portion passes in the circumferential direction of the first axis is the second angle; the first angle is greater than the second angle.

[0012] As can be seen from the above, this setting ensures that the anti-knock component has completely disengaged from the latch before the rotor rotates, thus preventing the unlocking action from being obstructed or even jammed.

[0013] A further proposed solution is that, on the axial projection of the first axis, the outer contour of the protrusion is a quarter circle, and the inner contour of the slot is a three-quarter circle, with the centers of both the quarter circle and the three-quarter circle being the first axis.

[0014] As can be seen from the above, under this configuration, compared to the small protrusion in the circumferential position and the arc-shaped slot, the area of ​​the first abutment part (outer circumferential surface) of the quarter-circular protrusion is larger. Similarly, the area of ​​the second abutment part (inner wall surface) of the slot is larger. Since the cylindrical cam drives the rotor by the abutment cooperation between the first abutment part and the second abutment part, this configuration makes the transmission contact area larger, avoids stress concentration, and extends the service life of the parts.

[0015] Another further option is that the anti-side-knock component includes a main rod portion that is slidably disposed along a first direction; and a driven portion that extends radially from the outer periphery of the main rod portion.

[0016] As can be seen from the above, under this configuration, the anti-side-knock component has a simple structure that is easy to process and install. Furthermore, since the driven part extends radially along the main rod, even if the lock cylinder position and the installation channel are spaced differently in the second direction for different lock bodies, it is only necessary to select an anti-side-knock component with a suitable driven part length to meet the assembly requirements of different lock bodies.

[0017] A further embodiment of the anti-knock lock also includes a lock body, which contains a bolt channel arranged in a second direction and a lock cylinder position and mounting channel arranged in a first direction; the mounting channel extends through the bolt channel and the outside of the lock body in the first direction; the anti-knock lock also includes a plug; the plug, the second reset member, and the anti-knock member are sequentially arranged between the bolt channel, the anti-knock member extends into the bolt channel, and the plug faces the outside of the lock body through the outlet of the bolt channel.

[0018] As can be seen from the above, with this setup, only drilling is needed to create the installation channel, making it easier to process the lock body.

[0019] A further proposed solution is to set the installation channel as an installation slot, with the installation slot having a groove that connects to the lock cylinder position, through which the driven part is installed into the lock body.

[0020] As can be seen from the above, this setting reduces the difficulty of installing the anti-side-knock component without affecting the normal use of the lock.

[0021] A further embodiment includes a locking ring, which comprises a first extension end and a second extension end disposed opposite to each other; the lock body is provided with an anti-rotation insertion hole along a first direction and a locking ring mounting hole along the first direction, the anti-rotation insertion hole communicating with the bolt channel; the second extension end is slidably mounted in the locking ring mounting hole along the first direction, and the first extension end can be inserted into the anti-rotation insertion hole; the second extension end is provided with a third engaging position, when the first extension end is located in the anti-rotation insertion hole and the bolt is located in the first position, the bolt engages with the third engaging position to restrict the first extension end from exiting the anti-rotation insertion hole. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of an embodiment of the anti-side-knock lock of this utility model.

[0023] Figure 2 This is a structural diagram of the hidden lock body in an embodiment of the anti-side-knock lock of this utility model.

[0024] Figure 3 This is a structural diagram of the lock body in an embodiment of the anti-side-knock lock of this utility model.

[0025] Figure 4 This is an exploded view of the lock cylinder assembly from a first-view perspective, representing an embodiment of the anti-side-knock lock of this utility model.

[0026] Figure 5 This is an exploded view of the lock cylinder assembly from a second perspective in an embodiment of the anti-side-knock lock of this utility model.

[0027] Figure 6 This is a cross-sectional view of the anti-knock lock embodiment of the present invention, showing the first mating state of the protrusion and the slot.

[0028] Figure 7 This is a cross-sectional view of the anti-side-knock lock embodiment of the present invention, showing the second mating state of the protrusion and the slot. Detailed Implementation

[0029] See Figure 1 In this embodiment, the anti-knock lock is a padlock. The padlock includes a lock body 1, a lock cylinder assembly 2, a bolt 3, a lock beam 4, an anti-knock assembly 5, a first reset member 39, and a third reset member 43. The lock cylinder assembly 2 includes a pin tumbler lock cylinder 21, a cylindrical cam 22, and a rotor 23. The anti-knock assembly 5 includes a plug 51, a second reset member 52, and an anti-knock member 51. Additionally, it includes a plug 48 and a limiting pin 49.

[0030] In this embodiment, the first reset member 39, the second reset member 52, and the third reset member 43 are all pressure springs.

[0031] Among them, the pin tumbler lock cylinder 21 is the existing pin tumbler lock cylinder 21. After the correct matching key is inserted into the pin tumbler lock cylinder 21, the output end 211 of the pin tumbler lock cylinder 21 can rotate around the first axis.

[0032] Figure 1 The vertical direction shown is the first direction of this utility model, and the horizontal direction is the second direction of this utility model. The lock body 1 is provided with a lock cylinder position 101, an installation channel 105 arranged along the first direction, and a lock tongue channel 102 arranged along the second direction. In addition, the lock body 1 is also provided with an anti-rotation insertion hole 104 along the first direction and a lock ring mounting hole 103 arranged along the first direction.

[0033] In the second direction, the lock cylinder position 101 is located in the center of the lock body 1, the lock ring mounting hole 103 is located on the side of the lock body 1, and the mounting channel 105 is located between the lock cylinder position 101 and the lock ring mounting hole 103.

[0034] The end of the lock cylinder position 101 and the end of the mounting channel 105 both connect to the bolt channel 102 along the first direction, and the end of the bolt channel 102 connects to the lock ring mounting hole 103. Both the lock cylinder position 101 and the mounting channel 105 open at the bottom of the lock body 1. Figure 1 (See the lower end of lock body 1), both the lock ring mounting hole 103 and the anti-rotation insertion hole 104 open at the top of lock body 1. Figure 1 The upper end of the lock body 1 is shown), and the bolt channel 102 opens into the side of the lock body 1. Figure 1 (See the right side of the lock body 1). These locations and channels are all open into the lock body 1. The main purpose is to make these locations and channels easier to form by drilling using mechanical equipment. For example, the mounting channel 105 extends along the first direction between the bolt channel 102 and the outside of the lock body 1. The mounting channel 105 can be formed by drilling along the first direction at the bottom of the lock body 1.

[0035] Further, see Figure 3 The mounting channel 105 is configured as a mounting groove, and the mounting groove has a slot 1051 that communicates with the lock cylinder position 101. The driven part 532 is installed into the lock body 1 through the slot 1051. Since the anti-side-knock member 53 has a forked extended driven part 532, the main purpose of this configuration is to enable the anti-side-knock member 53 to enter the mounting channel 105 through the entrance of the mounting channel 105. As the anti-side-knock member 53 enters the mounting channel 105 along the first direction from the entrance of the mounting channel 105, the driven part 532 enters through the slot 1051.

[0036] Of course, to ensure the airtightness of the internal structure, after the parts in the mounting channel 105 and the latch channel 102 are installed, the entrance of the mounting channel 105 is blocked by the plug 51, and the entrance of the latch channel 102 is blocked by the plug 48. Preferably, the plug 51 extends along the first direction, and its side is provided with a protrusion 511 that also extends along the first direction, the protrusion 511 blocking the slot 1051.

[0037] See Figure 1 and Figure 2 The locking ring 4 includes a first extension end 41 and a second extension end 42 disposed opposite to each other. The second extension end 42 is slidably installed in the locking ring mounting hole 103 along the first direction. The first extension end 41 can be inserted into the anti-rotation insertion hole 104. The second extension end 42 is provided with a third fastening position 421, which is a recessed position along the second direction.

[0038] Both the latch 3 and the first reset member 39 are disposed within the latch channel 102, with the first reset member 39 abutting against the end wall of the latch channel 102 and the latch 3. The latch 3 can move along the second direction within the latch channel 102, and under the restoring force of the first reset member 39, the latch 3 tends to move towards the first position. When the first extension end 41 is located in the anti-rotation insertion hole 104 and the latch 3 is in the first position, the latch 3 engages with the third engagement position 421, and the second extension end 42 cannot move along the first direction, thus restricting the first extension end 41 from exiting the anti-rotation insertion hole 104, thereby keeping the locking ring 4 in a locked state (e.g., Figure 1 Show).

[0039] The lower side of the latch 3 (the side facing the bottom of the lock body 1) is provided with a first engaging position 31 and a second engaging position 32. The first engaging position 31 and the second engaging position 32 are arranged sequentially along the second direction and are both concave upward.

[0040] The rotor 23 includes an eccentric portion 231 protruding upward along a first direction. The eccentric portion 231 is eccentrically positioned relative to the first axis of the rotor 23, and its outer periphery is semi-circular. The eccentric portion 231 engages with the first engaging position 31. When the rotor 23 rotates, the eccentric portion 231 forces the latch 3 to move toward the second position and in a direction away from the second extension end 42, eventually allowing the latch 3 to reach the second position and disengage from the third engaging position 421. Since the third reset member 43 abuts between the second extension end 42 and the lock body 1, when the latch 3 disengages from the third engaging position 421, the lock ring 4 will spring up under the restoring force of the third reset member 43, and the first extension end 41 will exit the anti-rotation insertion hole 104 to unlock. However, under the limitation of the limiting pin 49, the second extension end 42 cannot disengage from the lock ring mounting hole 103.

[0041] See Figure 1 and Figure 2The anti-side-knock member 53 includes a main rod portion 531 and a driven portion 532. The main rod portion 531 extends along a first direction and is slidably mounted in the mounting channel 105 along the first direction. The second reset member 52 is also mounted in the mounting channel 105 and abuts against the tail of the main rod portion 531 and the hole plug 51. The head of the main rod portion 531, opposite to its tail, extends into the latch channel 102. Under the restoring force of the second reset member 52, the anti-side-knock member 53 tends to move toward a third position. When the anti-side-knock member 53 is in the third position and the latch 3 is in the first position, the second engaging position 32 engages to restrict the movement of the latch 3 in the second direction.

[0042] See Figure 4 and Figure 5 The output end 211 protrudes from the first side of the tumbler lock core 21 along the axial direction of the first axis. The output end 211 is a semicircle centered at the first axis. The first axis is the rotation center of the cylindrical cam 22 and the rotor 23.

[0043] Along the axial direction of the first axis, a protruding post 223 is provided on the first side of the cylindrical cam 22, and a semi-circular hole 222 is provided on the first side along the axial direction. In this embodiment, the axial projection of the protruding post 223 is a quarter circle, and the center of the quarter circle and the center of the semi-circular hole 222 are both on the axis of the first axis. The output end 211 is inserted into the semi-circular hole 222, and when the output end 211 rotates, it drives the cylindrical cam 22 to rotate synchronously.

[0044] In addition, the cylindrical cam 22 includes a cam portion 221 located on its outer periphery. In the first direction, the cam surface of the cam portion 221 faces away from the locking tongue 3. The cam surface of the cam portion 221 passes through an angle of 90 degrees in the circumferential direction of the first axis, which is the second angle of this utility model. As the circumferential position changes, the height of the cam surface in the axial direction changes.

[0045] Combination Figure 1 and Figure 2 The driven part 532 abuts against the cam part 221. When the anti-side-knock member 53 is in the third position and the latch 3 is in the first position, during the rotation of the cylindrical cam 22 by the first angle, the cam part 221 forces the anti-side-knock member 53 to move from the third position to the fourth position along the first direction and away from the latch 3. The anti-side-knock member 53 in the fourth position disengages from the second engagement position 32. The first angle is greater than the second angle.

[0046] See also Figure 4 and Figure 5Along the axial direction of the first axis, a slot 232 is provided on the first side of the rotor 23, and an eccentric portion 231 protruding along the axial direction is provided on the second side of the rotor 23. In axial projection, the inner contour of the slot 232 is a three-quarter circle, with the center of each three-quarter circle at the first axis 100. In this invention, a quarter circle refers to a sector with an arc of 90 degrees, and a three-quarter circle refers to a sector with an arc of 270 degrees. Further, in this embodiment, the radius of the quarter circle is equal to the radius of the three-quarter circle.

[0047] Combined Figure 6 and Figure 7 The protrusion 223 is inserted axially into the slot 232. One of the outer peripheral surfaces of the protrusion 223 serves as the first abutment 2231 of this invention, and the inner wall surface of the slot 232 serves as the second abutment 2321 of this invention. Figure 6 In the state shown, in the circumferential direction of the first axis 100, the first abutting part 2231 and the second abutting part 2321 are separated by a first angle, which is 180 degrees in this embodiment.

[0048] See Figure 6 and Figure 7 When the pin tumbler lock cylinder 21 drives the cylindrical cam 22 to rotate, the protrusion 223 will move relative to the rotor 23 along... Figure 6 During the counterclockwise rotation of the cylindrical cam 22 in the current state, as the cylindrical cam 22 rotates to the first angle, the first abutment portion 2211 gradually approaches the second abutment portion 2321. After the cylindrical cam 22 has rotated through the first angle, the first abutment portion 2211 and the second abutment portion 2321 abut against each other, thereby enabling the cylindrical cam 22 and the rotor 23 to engage in transmission. Thus, the cylindrical cam 22 and the rotor 23 are configured such that the cylindrical cam 22 first idles for the first angle and then drives the rotor 23 to rotate.

[0049] Combined Figure 1 and Figure 2 Only after the main rod 531 is completely disengaged from the second engaging position 32 can the locking tongue 3 be driven by the eccentric part 231; otherwise, jamming will occur. Therefore, it is necessary to control the eccentric part 231 to remain stationary while allowing the main rod 531 to move. This requires a certain delay in the rotation of the rotor 23 relative to the rotation of the cylindrical cam 22. This invention, through the arrangement of the protrusion 223 and the slot 232, achieves the effect that the cylindrical cam 22 first idles at a first angle before driving the rotor 23 to rotate, thus satisfying the requirement of first disengaging the anti-side-knock mechanism and then unlocking.

[0050] When the key drives the lock cylinder to rotate, firstly, the cylindrical cam 22 rotates freely and drives the anti-knock member 53 to disengage from the bolt 3. Then, the cylindrical cam 22 drives the rotor 23 to rotate and push the bolt 3 to move to unlock. In the locked state, the anti-knock member 53 can lock the bolt 3 to achieve the anti-knock effect. Mainly, since the lock cylinder assembly and the anti-knock member 53 are arranged separately along the second direction rather than concentrated, the lock cylinder assembly including the rotor 23 and the cylindrical cam 22 can be arranged in the middle of the lock body 1, and the anti-knock assembly including the anti-knock member 53 and the second reset member 52 can be arranged in a side-biased position of the lock body 1. This arrangement is suitable for lock types with a central keyhole. In addition, in this arrangement, both the lock cylinder assembly and the anti-knock assembly use simpler structural components. The cylindrical cam 22, the anti-knock member 53, and other components are easier to process, reducing manufacturing difficulty, improving component strength, and reducing manufacturing costs.

[0051] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Anti-knock lock, including bolt, rotor and first reset element; The rotor rotates about a first axis extending in a first direction, and the rotor is provided with an eccentric portion relative to the first axis. The latch is configured to reciprocate along a second direction. The latch has a first engagement position. The first reset member cooperates with the latch. Under the restoring force of the first reset member, the latch tends to move toward the first position. The eccentric part engages with the first latching position, and when the rotor rotates, the eccentric part forces the locking tongue to move toward the second position; Its features are: It also includes anti-knock components and a second reset component; The anti-side-knock component is configured to reciprocate along the first direction. Under the restoring force of the second reset component, the anti-side-knock component tends to move towards the third position. It also includes a cylindrical cam, which includes a cam portion, and in the first direction, the cam portion faces away from the latch; The cylindrical cam is coaxially driven with the rotor, and the cylindrical cam and the rotor are configured such that the cylindrical cam first idles at a first angle and then drives the rotor to rotate. The anti-side-knock component includes a driven part, which abuts against the cam part; During the process of the cylindrical cam rotating at the first angle, the cam portion forces the anti-side knocking component to move from the third position to the fourth position; The latch also includes a second engagement position, wherein the anti-knock member in the third position engages with the second engagement position of the latch in the second position to restrict the movement of the latch in the second direction; The anti-side knocking component in the fourth position disengages from the second fastening position.

2. The anti-knock lock according to claim 1, characterized in that: The cylindrical cam is provided with a first abutting part, and the rotor is provided with a second abutting part; As the cylindrical cam rotates to the first angle, the first abutting part gradually approaches the second abutting part; After the cylindrical cam rotates through the first angle, the first abutting part abuts against the second abutting part so that the cylindrical cam and the rotor are engaged in transmission.

3. The anti-side-knock lock according to claim 2, characterized in that: The cylindrical cam is provided with a protrusion, and the first abutting part is the outer peripheral surface of the protrusion; The rotor is provided with a slot, and the second abutting part is the inner wall surface of the slot; The protrusion can move within the slot.

4. The anti-side-knock lock according to claim 3, characterized in that: The cylindrical cam includes a cam portion that abuts against a driven portion, and the angle through which the cam portion passes in the circumferential direction of the first axis is a second angle. The first angle is greater than the second angle.

5. The anti-side-knock lock according to claim 4, characterized in that: On the axial projection of the first axis, the outer contour of the protrusion is a quarter circle, and the inner contour of the slot is a three-quarter circle. The centers of both the quarter circle and the three-quarter circle are located at the first axis.

6. The anti-side-knock lock according to any one of claims 1 to 5, characterized in that: The anti-side-knock component includes a main rod portion, which is slidably disposed along the first direction; The driven part extends radially from the outer periphery of the main rod portion.

7. The anti-side-knock lock according to claim 6, characterized in that: The anti-side-knock lock also includes a lock body, the lock body having a bolt channel arranged along the second direction and a lock cylinder position and installation channel arranged along the first direction; The mounting channel extends along the first direction between the bolt channel and the exterior of the lock body; The anti-knock lock also includes a plug; The hole plug, the second reset member, and the anti-knock member are sequentially arranged between the bolt channel. The anti-knock member extends into the bolt channel, and the hole plug faces the outside of the lock body through the outlet of the bolt channel.

8. The anti-side-knock lock according to claim 7, characterized in that: The installation channel is configured as an installation slot, and the installation slot has a slot that communicates with the position of the lock cylinder. The driven part is installed into the lock body through the slot.

9. The anti-side-knock lock according to claim 8, characterized in that: It also includes a locking ring, which includes a first extension end and a second extension end disposed opposite to each other; The lock body is provided with an anti-rotation insertion hole along the first direction and a lock ring mounting hole along the first direction, the anti-rotation insertion hole being connected to the lock tongue channel; The second extension end is slidably mounted in the locking ring mounting hole along the first direction, and the first extension end can be inserted into the anti-rotation insertion hole; The second extension end is provided with a third engagement position. When the first extension end is located in the anti-rotation socket and the locking tongue is located in the first position, the locking tongue engages with the third engagement position to restrict the first extension end from exiting the anti-rotation socket.

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