Quick-release connecting piece

Abstract

The utility model discloses a quick-release connecting piece, and relates to the technical field of connecting buckles. The lock catch comprises a main lock catch, an auxiliary lock catch detachably connected with the main lock catch and a locking main body, the main lock catch is inserted into the locking main body in a penetrating mode, the main lock catch further comprises a limiting piece, and when the locking main body slides in the length direction of the main lock catch, the main lock catch and the auxiliary lock catch are locked, when the main lock catch and the auxiliary lock catch are locked, the locking main body is rotated, and the limiting piece prevents the locking main body from sliding in the length direction of the main lock catch. According to the embodiment of the utility model, the main lock catch, the auxiliary lock catch and the locking main body are arranged, so that the functions of quick disassembly and stable connection are realized; by rotating the locking main body, the limiting piece prevents the locking main body from sliding in the length direction of the main lock catch, and the situation that articles fall off due to loosening or misoperation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting buckle technical field, concretely relates to a quick release type connecting piece. BACKGROUND

[0002] In daily life, connecting buckle as a common small accessory is widely used in carrying keys, backpack accessories, fishing gear and other aspects, and becomes an indispensable small tool in daily life.

[0003] However, in daily use, since the design of connecting buckle is relatively simple, the user is easy to produce misoperation when opening or closing the lock, leading to the accidental falling of the article from the connecting buckle, and even loss, therefore, design a structure reasonable and convenient operation's connecting buckle becomes the technical problem to be solved in current technical field. UTILITY MODEL CONTENT

[0004] The utility model discloses a quick release type connecting piece, including main lock and with the detachable connection of main lock's auxiliary lock, the quick release type connecting piece still includes:

[0005] Locking main body, the main lock is inserted in the locking main body, the main lock still includes the spacer, when the locking main body slides along the main lock length direction, the main lock is locked with the auxiliary lock;

[0006] When the main lock is locked with the auxiliary lock, the locking main body is rotated, and the spacer prevents the locking main body from sliding along the length direction of the main lock.

[0007] The inner wall of the locking main body is equipped with first guide section and second guide section;

[0008] When the locking main body slides along the length direction of the main lock, the spacer slides along the length direction of the first guide section;

[0009] When the main lock is locked with the auxiliary lock, the locking main body is rotated, and the spacer slides along the length direction of the second guide section.

[0010] The main lock includes locking portion, fitting portion and first connecting portion, and the locking portion, fitting portion and first connecting portion are coaxially connected in a stepped manner;

[0011] The auxiliary lock includes fixed portion and the second connecting portion coaxially connected with the fixed portion, and the fixed portion is detachably installed in the locking portion and is coupled with the locking portion.

[0012] The limiting member comprises a limiting ball, the fitting part is provided with a containing cavity, part of the spherical surface of the limiting ball is located in the containing cavity, the limiting ball can rotate in the containing cavity and partially protrude from the surface of the fitting part.

[0013] The locking part is provided with at least one through hole, the through hole is provided with a limiting bead, the diameter of the through hole near the inner wall of the locking part is smaller than the diameter of the limiting bead, and the diameter of the through hole near the outer wall of the locking part is larger than the diameter of the limiting bead.

[0014] The number of the through holes is multiple, and the number of the limiting beads is consistent with the number of the through holes.

[0015] The fixing part is provided with a fixing groove, the inner wall of the locking body is further provided with a limiting boss, and the limiting boss and the fixing groove are opposite to the through hole when the main lock catch and the auxiliary lock catch are locked.

[0016] The first connecting part and the second connecting part are both provided with connecting holes.

[0017] The quick-release connecting piece further comprises a limiting ring, the locking part is provided with a limiting groove, the limiting ring is sleeved in the limiting groove and partially protrudes from the surface of the locking part.

[0018] The quick-release connecting piece further comprises a resetting member, the fitting part, the limiting boss and the locking part surround a resetting cavity, the resetting member is arranged in the resetting cavity, the connecting part of the locking part and the fitting part is provided with a limiting surface, one end of the resetting member is connected with the limiting surface, and the other end of the resetting member is connected with the limiting boss.

[0019] The utility model discloses an embodiment through setting up main lock catch, auxiliary lock catch and locking body, have realized quick release and stable connection's function, when main lock catch and auxiliary lock catch are locked, through rotating locking body, make limiting member prevent locking body from sliding along the length direction of main lock catch, avoid the article falling due to loosening or misoperation.

[0020] In addition, the rotation limiting design of the locking body enhances the stability and safety of the connecting piece, ensuring that the locking state can still be maintained after long-term use or frequent opening and closing. ACCURACY

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0022] Figure 1is a structural schematic view of the utility model;

[0023] Figure 2 is a structural schematic view of another view of the utility model;

[0024] Figure 3 is the A-A section view of corresponding Figure 2 ;

[0025] Figure 4 is the bottom view of the locking main body of the utility model;

[0026] Figure 5 is the B-B section view of Figure 4 ;

[0027] Figure 6 is the exploded structural view of the utility model.

[0028] Mark explanation:

[0029] 1, main lock buckle;11, limiting piece;12, locking portion;121, limiting groove;122, through hole;123, limiting bead;13, fitting portion;131, accommodating cavity;14, first connecting portion;15, limiting surface;

[0030] 2, vice lock buckle;21, fixed portion;22, fixed groove;23, second connecting portion;

[0031] 3, locking main body;31, first guide section;32, second guide section;33, limiting boss;

[0032] 4, connecting hole;

[0033] 5, limiting ring;

[0034] 6, reset piece;

[0035] 7, reset cavity. Specific embodiments

[0036] The utility model is further explained in detail below in combination with the drawings.

[0037] The specific embodiments are only the explanation of the utility model, and are not the limitation of the utility model, and the person skilled in the art can make the modification without the creative contribution according to the need after reading the present specification, but as long as in the claim range of the utility model, it is protected by the patent law.

[0038] In the embodiments of the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "underneath" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present application and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0039] Referring to Figures 1-6 The present embodiment relates to a quick release connector, comprising a main lock buckle 1 and a secondary lock buckle 2 detachably connected with the main lock buckle 1, and a locking body 3, the main lock buckle 1 is inserted into the locking body 3, the main lock buckle 1 further comprises a limiting piece 11, when the locking body 3 slides along the length direction of the main lock buckle 1, the main lock buckle 1 is locked with the secondary lock buckle 2, when the main lock buckle 1 is locked with the secondary lock buckle 2, the locking body 3 is rotated, and the limiting piece 11 prevents the locking body 3 from sliding along the length direction of the main lock buckle 1.

[0040] It should be noted that when the locking body 3 slides along the length direction of the main lock buckle 1, the main lock buckle 1 is unlocked with the secondary lock buckle 2, and the specific sliding direction should be determined according to the actual situation, in the present embodiment, as an example, when the locking body 3 slides along the length direction of the main lock buckle 1, and the sliding direction is towards the side close to the main lock buckle, the main lock buckle 1 is unlocked with the secondary lock buckle 2.

[0041] The utility model embodiment through setting up main lock buckle, secondary lock buckle and locking body, has realized quick disassembly and stable connection's function, when main lock buckle and secondary lock buckle are locked, through rotating locking body, limiting piece prevents locking body from sliding along the length direction of main lock buckle, avoids falling off because of loosening or misoperation.

[0042] In addition, the rotation limiting design of the locking body enhances the stability and safety of the connecting piece, ensuring that the locking state can be maintained after long-term use or frequent opening and closing.

[0043] With reference to Figure 3 and Figure 6 In some embodiments, the main lock 1 includes a locking portion 12, a fitting portion 13, and a first connecting portion 14, which are coaxially connected in a stepped manner; the secondary lock 2 includes a fixing portion 21 and a second connecting portion 23 coaxially connected with the fixing portion 21, and the fixing portion 21 is detachably installed in the locking portion 12 and coupled with the locking portion 12.

[0044] Specifically, the locking portion 12 is located on one side of the main lock 1 and has a hollow cylindrical structure, which is used to cooperate with the fixing portion 21 of the secondary lock 2. Its main function is to provide a fixed connection point between the main lock 1 and the secondary lock 2, ensuring that the two can be tightly combined. The fixing portion 21 is located on one side of the secondary lock 2 and is used to be inserted into the locking portion 12 of the main lock 1 and cooperate with it. The inner cavity of the locking portion 12 can accommodate the fixing portion 21. When the secondary lock 2 is inserted into the locking portion 12, mechanical connection is achieved through coupling design.

[0045] Specifically, the fitting portion 13 is connected between the locking portion 12 and the first connecting portion 14, and its external shape is adapted to the locking body 3. The fitting portion 13 is cylindrical.

[0046] The first connecting portion 14 is located on the other side of the main lock 1 and is coaxially connected with the locking portion 12 and the fitting portion 13. The first connecting portion 14 plays a bridging role and mainly provides a connection interface for the main lock 1 and other structures.

[0047] Similarly, the second connecting portion 23 is located on the other side of the secondary lock 2 and is coaxially connected with the fixing portion 21. Its shape design can match the first connecting portion 14. The second connecting portion 23 can also cooperate with other structures to meet more complex assembly requirements.

[0048] In some embodiments, the connecting hole 4 is a hole structure that penetrates the first connecting portion 14 or the second connecting portion 23. The connecting hole 4 is located on the central axis of the first connecting portion 14 and the second connecting portion 23, ensuring that the overall coaxial connection of the main lock 1 and the secondary lock 2 remains consistent. In addition to the common round hole and square hole, the connecting hole 4 can also be designed as a threaded hole to facilitate assembly through bolts or threaded rods and other fasteners. If it is necessary to enhance the anti-skid or anti-dropping performance of the assembly, the connecting hole 4 can also be designed as a polygonal hole or a hole with a stop structure to further improve the stability of the connection.

[0049] Further, the locking portion 12 is provided with at least one through hole 122, which penetrates the inner wall and the outer wall of the locking portion 12. The diameter of the side of the through hole 122 close to the inner wall of the locking portion 12 is smaller than the diameter of the limiting bead 123, so as to limit the limiting bead 123 from penetrating out of the inner cavity of the locking portion 12. The diameter of the side of the through hole 122 close to the outer wall of the locking portion 12 is larger than the diameter of the limiting bead 123, so as to allow part of the spherical surface of the limiting bead 123 to protrude out of the outer surface of the locking portion 12. The limiting bead 123 is arranged in the through hole 122 in this form, so as to be able to slide or swing flexibly within a specific range in the locking portion 12, and form cooperation with the inner wall structure of the locking body 3.

[0050] Further, the inner wall of the locking body 3 is provided with a limiting boss 33. When the locking body 3 slides or rotates along the main lock 1, the limiting bead 123 can contact the limiting boss 33 and form a physical limiting action.

[0051] Specifically, when the main lock 1 and the auxiliary lock 2 are in the locked state, the relative position of the limiting boss 33 and the limiting bead 123 is aligned with the through hole 122, so as to realize effective limiting of the locking portion 12, and further enhance the stability and reliability of the main lock 1 and the auxiliary lock 2 in the locked state.

[0052] In addition, the outer surface of the fixing portion 21 is provided with a fixed groove 22 which is recessed inward. The shape and size of the fixed groove 22 are matched with the limiting bead 123. During the locking process of the main lock 1 and the auxiliary lock 2, the position of the limiting boss 33 and the fixed groove 22 is relatively aligned, forming a further mechanical clamping structure, so as to limit the axial displacement of the auxiliary lock 2.

[0053] Specifically, when the main lock 1 and the auxiliary lock 2 change from the locked state to the unlocked state, the locking body 3 slides along the length direction of the main lock 1, so that the limiting boss 33 gradually separates from the contact with the limiting bead 123. With the continuous sliding of the locking body 3, the limiting bead 123 exits from the fixed groove 22 and returns to the through hole 122 completely. Since the limiting bead 123 loses the clamping action with the limiting boss 33 and the fixed groove 22, the limiting function of the locking portion 12 is released, and the locked state of the main lock 1 and the auxiliary lock 2 is destroyed, so as to allow the auxiliary lock 2 to separate along the axial direction, and realize the unlocking operation.

[0054] Further, the locking portion 12 in the embodiment is provided with three through holes 122, which are uniformly distributed along the circumferential direction of the locking portion 12 and arranged at intervals of 120 degrees. Each of the through holes 122 is provided with a limiting bead 123, and the number of the limiting beads 123 is consistent with the number of the through holes 122.

[0055] In the locked state, the three limiting beads 123 are in contact with the limiting bosses 33 on the inner wall of the locking body 3, forming a multi-point limiting action, improving the force uniformity of the locking part 12 and the locking stability of the main lock 1 and the auxiliary lock 2. In the unlocked state, with the sliding of the locking body 3, the limiting beads 123 are sequentially separated from the limiting bosses 33 and exit the fixed groove 22, and finally completely release the locking, ensuring a smooth and smooth unlocking process.

[0056] Preferably, the limiting beads 123 and the limiting balls can be metal or ceramic beads.

[0057] Reference Figures 4-6 In some embodiments, the inner wall of the locking body 3 is provided with a first guide section 31 and a second guide section 32, and the limiting member 11 is arranged on the main lock 1. The outer part of the limiting member 11 cooperates with the guide sections on the inner wall of the locking body 3. When the locking body 3 rotates in the locked state, the limiting member 11 transitions from the first guide section 31 to the second guide section 32 during rotation and slides along the second guide section 32. The movement direction of the limiting member 11 changes from sliding in the first guide section 31 to sliding in the second guide section 32. Since the sliding directions of the first guide section 31 and the second guide section 32 are designed to be opposite or incompatible, a conflict in the movement direction is formed, effectively limiting the linear sliding of the locking body 3 along the length direction of the main lock 1, and ensuring that the main lock 1 and the auxiliary lock 2 stably maintain the locked state.

[0058] Further, the limiting member 11 includes a limiting ball, and the fitting part 13 is provided with a receiving cavity 131, which is an open groove structure. The internal space is used to accommodate part of the limiting ball. Part of the ball body of the limiting ball can be detachably located inside the receiving cavity 131 and in contact with the inner wall of the receiving cavity 131, allowing the limiting ball to rotate or swing freely inside the cavity. Another part of the ball body of the limiting ball protrudes from the outer surface of the fitting part 13, forming an external contact surface, which is used to cooperate with the first guide section 31 and the second guide section 32 of the locking body 3. When the locking body 3 slides or rotates along the length direction of the main lock 1, the limiting ball can rotate or slide in the receiving cavity 131 through the contact with the guide section, ensuring its continuous contact with the inner wall of the locking body 3. The limiting ball is linearly guided along the first guide section 31 during the sliding of the locking body 3, smoothly transitions from the first guide section 31 to the second guide section 32 when the locking body 3 rotates, and realizes a new movement trajectory in the second guide section 32, thereby effectively limiting the movement direction of the locking body 3.

[0059] Further, the inner wall shape of the accommodating cavity 131 and the surface contact range of the limiting ball are limited in a certain area, which can provide sufficient supporting force and ensure the flexible rotation and sliding of the limiting ball in the cavity. The protruding outer surface of the limiting ball realizes the limiting effect on the locking body 3 by cooperating with the guide section. When the locking body 3 rotates, the sliding behavior of the locking body 3 is limited through the force and motion trail of the limiting ball, thereby maintaining the locking state of the main lock 1 and the auxiliary lock 2.

[0060] It should be noted that in the present embodiment, the limiting ball can freely rotate or slide in the accommodating cavity 131, but whether the limiting ball rotates or not has no effect on the realization of the limiting function. The limiting ball can be designed as a non-rotating limiting pin or other similar structures. The existence of these structures in the accommodating cavity only needs to ensure physical contact with the guide section, thereby effectively limiting the function.

[0061] In an embodiment, the limiting ball can be replaced by a non-rotating limiting pin, a limiting cam, a limiting roller, a limiting bar, a limiting gear, a limiting block, or a spring-type limiter. These structures realize the limiting function by contacting the guide section.

[0062] In the present embodiment, the limiting ball realizes efficient motion guidance and precise limiting function through the rotation of its spherical structure in the accommodating cavity 131 and the sliding on the guide section. At the same time, the partial protruding design of the ball surface of the limiting ball ensures reliable physical contact with the guide section, improving the stability and reliability during the locking and unlocking operation.

[0063] In some embodiments, the quick release connector further comprises a limiting ring 5, and the outer surface of the locking portion 12 is provided with an annular limiting groove 121. The limiting groove 121 is a groove structure opened along the circumference of the locking portion 12, used for accommodating the limiting ring 5. The limiting ring 5 is a closed annular member, which is sleeved in the limiting groove 121 and is fixedly installed with the locking portion 12 through the constraint of the limiting groove 121.

[0064] Specifically, the inner diameter of the limiting ring 5 is greater than the depth of the limiting groove 121, so that part of the outer surface of the limiting ring 5 protrudes from the outer surface of the locking portion 12. The protruding part of the limiting ring 5 can cooperate with the inner wall of the locking body 3 during the assembly of the connector, thereby realizing the axial limiting function of the locking portion 12.

[0065] In some embodiments, the quick release connector further comprises a reset member 6, which is used to provide an elastic reset function during the operation of the quick release connector.

[0066] Specifically, the chimeric part 13, the limiting boss 33 and the locking part 12 are collectively surrounded to form a reset cavity 7, the reset part 6 is installed in the reset cavity 7, the reset cavity 7 is a closed or semi-closed structure, the internal space is used for accommodating the reset part 6, and the elastic deformation and reset action of the reset part 6 are provided with the activity space; the connecting part of the locking part 12 and the chimeric part 13 is provided with a limiting surface 15, the limiting surface 15 provides a fixed support point for one end of the reset part 6, the other end of the reset part 6 is connected with one side of the limiting boss 33, the limiting boss 33 drives the reset part 6 to be elastically deformed through the sliding of the locking main body 3, in the locking or unlocking operation process, the reset part 6 stores elastic energy after being compressed or stretched by external force, and after the external force is released, the limiting boss 33 is pushed back to the initial position through the elastic recovery force, so that the reset action of the locking main body 3 is realized.

[0067] Preferably, the reset part 6 is a spiral spring, and can also be other structure forms with good elasticity and durability.

[0068] The working principle of the utility model is as follows:

[0069] In the unlocking state, the locking main body 3 slides along the length direction of the main lock buckle 1 and close to one side of the main lock buckle 1, so that the limiting boss 33 on the inner wall of the locking main body 3 gradually separates from the contact with the limiting bead 123, along with the continuous sliding, the limiting bead 123 exits from the fixed groove 22 of the auxiliary lock buckle 2 and returns to the through hole 122 of the locking part 12, at this time, the limiting bead 123 is no longer constrained by the limiting boss 33 and the fixed groove 22, the auxiliary lock buckle 2 can separate from the main lock buckle 1 along the axial direction, and the locking state between the main lock buckle 1 and the auxiliary lock buckle 2 is released.

[0070] In the ordinary locking state, the locking part 12 of the main lock buckle 1 is connected with the fixed part 21 of the auxiliary lock buckle 2, the fixed part 21 is inserted into the inner cavity of the locking part 12, the limiting bead 123 is partially embedded in the fixed groove 22 of the auxiliary lock buckle 2 and partially protrudes from the outer surface of the locking part 12 through the through hole 122, and at the same time, the locking main body 3 slides to the locking position, the limiting boss 33 on the inner wall of the locking main body 3 is in contact with the limiting bead 123, the axial sliding of the locking part 12 is limited, so that the main lock buckle 1 and the auxiliary lock buckle 2 are locked.

[0071] On the basis of the ordinary locking state, the locking main body 3 rotates along the length direction of the second guide section 32, the first guide section 31 and the second guide section 32 on the inner wall of the locking main body 3 are matched with the limiting ball on the main lock buckle 1, the limiting ball is transitioned from the first guide section 31 to the second guide section 32 in the rotating process and slides along the second guide section 32, due to the difference between the sliding directions of the first guide section 31 and the second guide section 32, the movement of the limiting part 11 is limited, so that the linear sliding of the locking main body 3 is controlled, in this state, the locking main body 3 is limited in the rotary locking state, the main lock buckle 1 and the auxiliary lock buckle 2 are locked and cannot be unlocked.

[0072] The above merely serves to illustrate the technical solutions of the present application and is not intended to be limiting. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present application, as long as they do not depart from the spirit and scope of the present application, should be encompassed in the scope of the claims of the present application.

Claims

1. A quick release connector comprising a main carabiner (1) and a secondary carabiner (2) removably connected to the main carabiner (1), characterized in that, The quick release connector further comprises: A locking body (3) in which the main lock (1) is inserted, the main lock (1) further comprising a limiting member (11), when the locking body (3) slides along the length direction of the main lock (1), the main lock (1) is locked with the auxiliary lock (2); When the main lock (1) is locked with the auxiliary lock (2), the limiting member (11) prevents the locking body (3) from sliding along the length direction of the main lock (1) by rotating the locking body (3).

2. A quick release connector according to claim 1, wherein The inner wall of the locking body (3) is provided with a first guide section (31) and a second guide section (32); When the locking body (3) slides along the length direction of the main lock (1), the limiting member (11) slides along the length direction of the first guide section (31); When the main lock (1) is locked with the auxiliary lock (2), the locking body (3) rotates, and the limiting member (11) slides along the length direction of the second guide section (32).

3. A quick release connector according to claim 1 or 2, wherein The main lock (1) comprises a locking portion (12), a fitting portion (13) and a first connecting portion (14), which are connected coaxially in a stepped manner; The auxiliary lock (2) comprises a fixed portion (21) and a second connecting portion (23) coaxially connected with the fixed portion (21), the fixed portion (21) is detachably installed in the locking portion (12) and coupled with the locking portion (12).

4. A quick release connector according to claim 3, wherein The limiting member (11) comprises a limiting ball, the fitting portion (13) is provided with a receiving cavity (131), part of the spherical surface of the limiting ball is located in the receiving cavity (131), the limiting ball can rotate in the receiving cavity (131) and partially protrude from the surface of the fitting portion (13).

5. A quick release connector according to claim 3, wherein The locking portion (12) is provided with at least one through hole (122), the through hole (122) is provided with a limiting bead (123), the diameter of the through hole (122) close to the inner wall of the locking portion (12) is smaller than the diameter of the limiting bead (123), and the diameter of the through hole (122) close to the outer wall of the locking portion (12) is larger than the diameter of the limiting bead (123).

6. A quick release connector according to claim 5, wherein The number of the through holes (122) is consistent with the number of the limiting beads (123).

7. A quick release connector according to claim 5, wherein The fixed portion (21) is provided with a fixed groove (22), and the inner wall of the locking body (3) is further provided with a limiting boss (33), the limiting boss (33) and the fixed groove (22) are opposite to the through hole (122) when the main lock (1) is locked with the auxiliary lock (2).

8. A quick release connector according to claim 3, wherein The first connecting portion (14) and the second connecting portion (23) are both provided with a connecting hole (4).

9. The quick release connector of claim 3, wherein, The quick release connector further comprises a limiting ring (5), the locking portion (12) is provided with a limiting groove (121), the limiting ring (5) is sleeved in the limiting groove (121) and partially protrudes from the surface of the locking portion (12).

10. The quick release connector of claim 7, wherein, The quick release connector further comprises a reset member (6), the embedding part (13), the limiting boss (33) and the locking part (12) surround to form a reset cavity (7), the reset member (6) is arranged in the reset cavity (7), the connecting part of the locking part (12) and the embedding part (13) is provided with a limiting surface (15), one end of the reset member (6) is connected with the limiting surface (15), and the other end is connected with the limiting boss (33).

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