CN115962207B

CN115962207B - Connecting device

Info

Publication number: CN115962207B
Application number: CN202210646411.2A
Authority: CN
Inventors: 金俊良
Original assignee: Jiangmen Guangli Electronic Technology Co ltd
Current assignee: Jiangmen Guangli Electronic Technology Co ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2023-11-03
Anticipated expiration: 2042-06-08
Also published as: WO2023237003A1; CN115962207A

Abstract

The invention relates to a connecting device, which comprises a connecting mechanism and a first locking piece; the connecting mechanism comprises a connecting main body, a limiting slide bar and an elastic piece, wherein the connecting main body comprises a shaft body part and a first head part connected to the end part of the shaft body part, and the shaft body part is provided with a slide groove; the limiting slide rod is arranged in the sliding groove along the axial direction of the shaft body part in a sliding manner, one end of the limiting slide rod at least can slide to a first state and a second state, in the first state, at least one end of the limiting slide rod at least partially exceeds the sliding groove and overlaps the first head part in the radial direction of the shaft body part, the overlapped part of the limiting slide rod and the first head part protrudes out of the outer circumferential surface of the first head part along the radial direction of the shaft body part, in the second state, the limiting slide rod does not overlap the first head part in the radial direction of the shaft body part, in the second state, the first head part can be assembled with the first locking part, and in the first state, the overlapped part of the limiting slide rod and the first head part can limit the first head part to rotate relative to the first locking part.

Description

Connecting device

Technical Field

The invention relates to the technical field of structural connection, in particular to a connecting device.

Background

In the field of content creation such as television, movie, stage shooting and the like in the related art, the fixation of scenery elements such as lamps, video walls, green curtains and the like is usually performed by means of screws, bolts and the like on objects to be fixed, but the fixation is usually troublesome, tools are required, and more hands are required to fix the heavy scenery elements, so that the manpower is wasted.

Disclosure of Invention

The invention aims to provide a connecting device which is more convenient to connect and detach.

According to an aspect of the present invention, there is provided a connection device including:

a connecting mechanism and a first locking piece; the connecting mechanism comprises:

the connecting body comprises a shaft body part and a first head part connected to the end part of the shaft body part, a sliding groove is formed in the shaft body part, the sliding groove extends along the axial direction of the shaft body part, one end of the sliding groove penetrates through one end of the shaft body part towards the first head part along the axial direction of the shaft body part;

the limiting slide rod is arranged in the sliding groove in a sliding manner along the axial direction of the shaft body, one end of the limiting slide rod at least can slide to a first state and a second state, in the first state, at least one end of the limiting slide rod at least partially exceeds the sliding groove and is overlapped with the first head in the radial direction of the shaft body, the overlapped part of the limiting slide rod and the first head protrudes out of the outer peripheral surface of the first head along the radial direction of the shaft body, in the second state, the limiting slide rod is not overlapped with the first head in the radial direction of the shaft body, in the second state, the first head can be assembled with the first locking piece, in the first state, the limiting slide rod can be converted into the first state from the second state when the first head rotates by a preset angle relative to the first locking piece, and in the first state, the overlapped part of the limiting slide rod and the first head can limit the first locking piece from rotating relatively to the first locking piece; and

The elastic piece is arranged in the sliding groove, one end of the elastic piece is abutted to the limiting sliding rod, the other end of the elastic piece is abutted to the shaft body, and when no external force is applied, the elastic force of the elastic piece acting on the limiting sliding rod can drive the limiting sliding rod to maintain in the first state.

As one embodiment of the present invention, the first head includes a first central axis identical to an axial direction of the shaft body, and a protruding portion formed to protrude outward in a radial direction of the first central axis, the protruding portion being spaced apart from the shaft body in the axial direction of the shaft body by a spacing L1; the first locking piece is formed with the holding chamber and with the spacing jack of holding chamber intercommunication, the axial depth of spacing jack is less than L1, spacing jack include with the center pin hole that the first center pin corresponds and with the side opening that the protrusion corresponds when the second state, first head has one end of protrusion can be passed through spacing jack inserts in the holding chamber, and when first head is relative first locking piece rotates preset angle, spacing slide bar with first head overlaps the part and is moved to in the side opening under the drive of elastic component.

As one embodiment of the invention, the protruding part comprises a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged at intervals around the central axis of the first central shaft, the first protruding part and the second protruding part are symmetrically arranged, the first protruding part and the second protruding part are respectively arranged at intervals with the shaft body part in the axial direction of the shaft body part, the interval between the first protruding part and the second protruding part is L1, and the length of the part of the limit sliding rod exceeding the sliding groove is not more than L1.

As one embodiment of the present invention, the shape and size of the portion of the stopper rod overlapping the first head portion are adapted to the side hole.

As one embodiment of the present invention, the sliding chute includes a guiding groove, a limiting groove and a limiting through hole communicating the guiding groove and the limiting groove, wherein the guiding groove, the limiting groove and the limiting through hole all extend along an axial direction of the shaft portion, one end of the guiding groove penetrates through the shaft portion along the axial direction of the shaft portion, the guiding groove and the limiting groove are respectively formed on two opposite sides of the shaft portion, the limiting sliding rod includes a main sliding rod slidably disposed in the guiding groove, a limiting rod integrally formed on one side of the main sliding rod, and a toggle portion integrally formed on the other side of the main sliding rod, the toggle portion extends out of the guiding groove along a radial direction of the shaft portion, the limiting rod penetrates through the limiting through hole and extends into the limiting groove, the elastic member is disposed in the limiting groove, one end of the elastic member is abutted against the limiting rod, and the other end of the elastic member is abutted against the shaft portion.

As one embodiment of the invention, the guide groove comprises an upper groove part and a lower groove part, the bottom wall of the upper groove part is recessed inwards along the radial direction to form the lower groove part, one end of the upper groove part penetrates through the shaft body part along the axial direction of the shaft body part, the main slide rod comprises an upper slide rod part arranged in the upper groove part and a lower slide rod part positioned in the lower groove part, in the first state, the end part of the lower slide rod part, which faces the first head part, is abutted on the inner wall of the end of the lower groove part, which faces the first head part, and the limiting rod is abutted on the inner wall of the limiting through hole, which faces the end of the first head part.

As one embodiment of the present invention, the length of the lower groove portion extending in the axial direction of the shaft portion is L2, the length of the lower slide bar portion extending in the axial direction of the shaft portion is L3, and the length of the limiting through hole extending in the axial direction of the shaft portion is L4, wherein L2-l3=l4.

As an embodiment of the present invention, the connecting device further includes a limiting component, where the limiting component can limit the sliding of the limiting sliding rod from the first state to the second state.

As one embodiment of the invention, a first pin hole is formed in the shaft body along the radial direction of the shaft body, a second pin hole is formed in the main sliding rod, the first pin hole and the second pin hole are aligned in the first state, and the limiting assembly comprises a pin shaft which is detachably arranged in the first pin hole and the second pin hole in a penetrating mode.

As one embodiment of the invention, a first pin hole is formed in the shaft body part along the radial direction of the shaft body part in a penetrating way, the limit sliding rod comprises a poking part extending out of the sliding groove along the radial direction of the shaft body part, the limit assembly comprises a pin shaft, the pin shaft is detachably arranged in the first pin hole in a penetrating way, one end of the pin shaft can extend out of the first pin hole, and the part extending out of the first pin hole is positioned on a path of the limit sliding rod moving from the first state to the second state.

As an embodiment of the invention, the connecting device further comprises a second head arranged opposite to the first head and a second locking member for locking with the second head.

As one embodiment of the present invention, the limit sliding rod includes a toggle portion extending out of the sliding groove along a radial direction of the shaft body, the limit component is the toggle portion, and when the second head is locked with the second locking member, an end of the second locking member facing the second head is located on a path along which the toggle portion moves when moving from the first state to the second state.

As an embodiment of the present invention, the second head portion includes a second central shaft identical to an axial direction of the shaft body portion, and annular projections formed to project outward in a radial direction of the second central shaft, the annular projections being spaced apart from the shaft body portion in the axial direction of the shaft body portion.

As one embodiment of the present invention, the shaft body portion includes a first shaft portion and a second shaft portion integrally formed on the first shaft portion, the outer diameter of the first shaft portion is larger than the outer diameter of the second shaft portion, a step is formed between the first shaft portion and the second shaft portion, the sliding groove is formed on the second shaft portion, the connecting mechanism further includes a casing, the casing is sleeved on the second shaft portion, a sliding hole is formed on a position, corresponding to the sliding groove, on the casing, the length of the second shaft portion is the same as the length of the casing, and one end of the casing is abutted against the step.

As an embodiment of the present invention, the shaft body, the first head, and the second head are integrally formed.

The implementation of the embodiment of the invention has the following beneficial effects:

in the connecting device in this embodiment, the limit slide bar is moved to the second state, the first head is assembled on the first locking piece, then the first head is rotated and the first head is rotated by a preset angle, at this time, the first head is locked with the first locking piece, then the limit slide bar is moved to enable the limit slide bar to be changed into the first state from the second state, at this time, the first head can not rotate relative to the first locking piece any more, and therefore the first head can not be removed from the first locking piece, and therefore the connection stability of the first head and the first locking piece can be ensured. When the first head needs to be removed from the first locking piece, the limit sliding rod is moved first, and the limit sliding rod is moved from the first state to the second state, and at the moment, the first head can be rotated to enable the first head to be removed from the first locking piece. Through the cooperation between coupling mechanism and the first locking piece in this embodiment, can realize coupling mechanism and the quick closure and the separation of first locking piece fast, improve connection efficiency.

In addition, the elastic component sets up in the spout, and the one end butt of elastic component is on spacing slide bar, and the other end butt of elastic component is on axle body portion, and when not exerting external force, the elasticity of elastic component effect on spacing slide bar can order about spacing slide bar to maintain in first state. Through the effect of elastic component to spacing slide bar, can make spacing slide bar under the condition that does not exert the elasticity that surpasss the elastic component to can make first head unable rotation, thereby make first head and first locking piece can be together stable connection. When the first head needs to be taken out of the first locking piece, an external force needs to be applied to the limit sliding rod, so that the limit sliding rod moves from the first state to the second state, and at the moment, the first head can rotate and is taken out of the first locking piece.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a connecting device according to an embodiment of the invention;

FIG. 2 is a schematic structural view of a connecting mechanism according to an embodiment of the present invention;

FIG. 3 is one of the exploded schematic views of the connection mechanism of FIG. 2;

FIG. 4 is a second exploded view of the connection mechanism of FIG. 2;

FIG. 5 is a cross-sectional view of the attachment mechanism of FIG. 2;

FIG. 6 is a schematic view of the structure of the first locking member;

FIG. 7 is a cross-sectional view of the first locking member of FIG. 6;

FIG. 8 is a schematic structural view of the second locking member;

FIG. 9 is a schematic cut view of the second locking member of FIG. 8;

FIG. 10 is one of the partial schematic structural views of the second locking member of FIG. 8;

FIG. 11 is a second schematic view of a portion of the second locking member shown in FIG. 8;

FIG. 12 is a schematic view of a portion of the structure of FIG. 11 from another perspective;

wherein: 1. a connecting device; 10. a connecting mechanism; 20. a first locking member; 21. a receiving chamber; 22. limiting jack; 22a, a central shaft hole; 22b, side holes; 30. a second locking member; 100. a connecting body; 110. a shaft body part; 111. a chute; 1111. a guide groove; 1111a, an upper groove portion; 1111b, lower groove portion; 1112. a limit groove; 1113. limiting through holes; 113. a first shaft portion; 114. a second shaft portion; 1134. a step; 120. a first head; 121. a first central axis; 122. a protruding portion; 1221. a first boss; 1222. a second protruding portion; 130. a second head; 131. a second central axis; 132. an annular protrusion; 133. an annular groove; 200. a limit slide bar; 210. a main slide bar; 211. an upper slide bar portion; 212. a lower slide bar portion; 220. a limit rod; 230. a toggle part; 300. an elastic member; 400. a casing; 410. a slide hole; 500. a base; 510. mounting through holes; 511. a first port; 512. a second port; 600. a bottom plate; 610. a first plane; 700. a limiting piece; 710. a half shaft hole; 720. a notch; 730. a second plane; 741. a first connection surface; 742. a second connection surface; 750. an inclined surface; 800. a mounting base; 810. an assembly groove; 820. a limiting hole; 830. a guide through hole; 840. a guide chute; 850. limiting the channel wall; 910. a spring member; 920. a pressing member; 930. a safety piece.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-12, an embodiment of the present invention provides a connecting device 1, where the connecting device 1 in this embodiment is mainly used for connecting two different structures together, or fixing one of the structures or devices on the other structure, and the connecting device 1 in this embodiment is mainly applied to the field of device fixing connection, especially the field of content creation such as tv, movie and stage shooting. For example, the light source can be applied to fixedly connecting scenery elements such as shooting lamps, reflectors, diffusers, video walls, cameras, green curtains, textiles and the like.

In an embodiment, the connection device 1 includes the connection mechanism 10 and the first locking member 20, where the first locking member 20 may be used to connect an object a, such as a lamp, and the connection structure may be used to connect an object B, such as other locking members, where it should be noted that the object a and the object B are both referred to as a certain object, and a and B have no specific meaning.

Referring to fig. 1-7, the connecting mechanism 10 in the present embodiment includes a connecting body 100, the connecting body 100 includes a shaft portion 110 and a first head portion 120 connected to an end of the shaft portion 110, the shaft portion 110 is provided with a sliding slot 111, the sliding slot 111 extends along an axial direction of the shaft portion 110, and one end of the sliding slot 111 penetrates through the shaft portion 110 along the axial direction of the shaft portion 110 toward one end of the first head portion 120. The connection mechanism 10 further includes a limit slide bar 200, wherein the limit slide bar 200 is slidably disposed in the slide groove 111 along the axial direction of the shaft body 110, and one end of the limit slide bar 200 is capable of sliding at least to a first state and a second state, in the first state, one end of the limit slide bar 200 at least partially exceeds the slide groove 111 and overlaps the first head 120 in the radial direction of the shaft body 110, and a portion of the limit slide bar 200 overlapping the first head 120 protrudes from the outer circumferential surface of the first head 120 along the radial direction of the shaft body 110, in the second state, the limit slide bar 200 does not overlap the first head 120 in the radial direction of the shaft body 110, in the second state, the first head 120 can be assembled with the first locking member 20, and when the first head 120 rotates a preset angle relative to the first locking member 20, the limit slide bar 200 can be switched from the second state to the first state, in the first state, the portion of the limit slide bar 200 overlapping the first head 120 can be limited to rotate relative to the first locking member 20, in the first state, and in the first state, the limit slide bar 200 can be conveniently locked between the first state and the first locking member 20 by moving the limit slide bar 200 in the radial direction.

Specifically, the connection method between the first head 120 and the first locking member 20 in this embodiment is as follows: firstly, the limit slide bar 200 is moved to a second state, the first head 120 is assembled on the first locking piece 20, then the first head 120 is rotated and the first head 120 is rotated by a preset angle, at this time, the first head 120 is locked with the first locking piece 20, then the limit slide bar 200 is moved to enable the limit slide bar 200 to be changed from the second state to the first state, at this time, the first head 120 can not rotate relative to the first locking piece 20 any more, so that the first head 120 can not be removed from the first locking piece 20, and therefore, the connection stability of the first head 120 and the first locking piece 20 can be ensured. When the first head 120 needs to be removed from the first locking member 20, the stopper slide bar 200 is first moved, and the stopper slide bar 200 is moved from the first state to the second state, at which time the first head 120 may be rotated to remove the first head 120 from the first locking member 20. By the cooperation between the connection mechanism 10 and the first locking member 20 in the present embodiment, the connection mechanism 10 and the first locking member 20 can be quickly locked and separated, and the connection efficiency is improved.

Further, the connecting mechanism 10 further includes an elastic member 300, the elastic member 300 is disposed in the chute 111, one end of the elastic member 300 abuts against the limit sliding rod 200, the other end of the elastic member 300 abuts against the shaft portion 110, and when no external force is applied, the elastic force of the elastic member 300 acting on the limit sliding rod 200 can drive the limit sliding rod 200 to maintain the first state. By the action of the elastic member 300 on the stopper slide bar 200, the stopper slide bar 200 can be maintained in the first state without applying an elastic force exceeding that of the elastic member 300, so that the first head 120 can be prevented from rotating, thereby enabling the first head 120 and the first locking member 20 to be stably coupled together. When the first head 120 is required to be removed from the first locking member 20, an external force needs to be applied to the stopper slide bar 200 so that the stopper slide bar 200 moves from the first state to the second state, and at this time the first head 120 can be rotated and removed from the first locking member 20.

Further, the first head 120 includes a first central axis 121 identical to the axial direction of the shaft body 110, and a protruding portion 122 protruding outward in the radial direction of the first central axis 121, the protruding portion 122 being spaced apart from the shaft body 110 in the axial direction of the shaft body 110 by a spacing L1; the first locking member 20 is formed with a receiving chamber 21 and a limiting insertion hole 22 communicating with the receiving chamber 21, the limiting insertion hole 22 has an axial depth smaller than L1, the limiting insertion hole 22 includes a middle shaft hole 22a corresponding to the first central shaft 121 and a side hole 22b corresponding to the protruding portion 122, "corresponding" in the foregoing or later embodiments means that the shape and size are substantially the same, in the second state, one end of the first head 120 having the protruding portion 122 can be inserted into the receiving chamber 21 through the limiting insertion hole 22, and when the first head 120 rotates a preset angle with respect to the first locking member 20, a portion of the limiting slide bar 200 overlapped with the first head 120 moves into the side hole 22b under the driving of the elastic member 300. In this embodiment, since the axial depth of the limiting insertion hole 22 is smaller than L1, the protruding portion 122 can be guaranteed to completely enter the accommodating cavity 21 in the second state, then the first head 120 is rotated, and when the preset angle is rotated, the limiting slide bar 200 corresponds to the side hole 22b in the axial direction thereof, at this time, the limiting slide bar 200 can be driven by the elastic member 300 to be converted into the first state from the second state, so that the overlapping portion of the limiting slide bar 200 and the first head 120 moves into the side hole 22b, and since the overlapping portion of the limiting slide bar 200 and the first head 120 is located in the side hole 22b, and the overlapping portion of the limiting slide bar 200 and the first head 120 protrudes out of the outer peripheral surface of the first central shaft 121, the side hole 22b is limited to rotate relative to the axis of the central shaft hole 22a, and the protruding portion 122 cannot rotate to correspond to the side hole 22b, and the protruding portion 122 cannot be separated from the accommodating cavity 21, so that the first head 120 and the first locking member 20 are stably connected. Only when an external force is applied to overcome the elastic force of the elastic piece 300 to enable the limit sliding rod 200 to be converted from the first state to the second state, the protruding part 122 can be taken out from the accommodating cavity 21.

In addition, since the central shaft hole 22a corresponds to the first central shaft 121, and the overlapping portion of the limit slide bar 200 and the first head 120 protrudes from the outer peripheral surface of the first central shaft 121, so that in the normal use process, when only the first head 120 is required to be inserted into the limit insertion hole 22, the end face of the limit insertion hole 22, where the insertion hole is inserted, will abut against the end of the limit slide bar 200 facing the first head 120, so that the limit slide bar 200 will gradually change from the first state to the second state along with the insertion of the first head 120, and then the limit slide bar 200 will automatically change from the second state to the first state by rotating the first head 120 to a preset angle. In this embodiment, when the first head 120 is mounted on the first locking member 20, the first head 120 may be mounted on the first locking member 20 without manually controlling the stopper slide bar 200 to the second state. The operation convenience of the user is improved.

Further, the protruding portion 122 includes a first protruding portion 1221 and a second protruding portion 1222, the first protruding portion 1221 and the second protruding portion 1222 are spaced around the central axis of the first central shaft 121, the first protruding portion 1221 and the second protruding portion 1222 are symmetrically disposed, the first protruding portion 1221 and the second protruding portion 1222 are respectively spaced from the shaft body 110 in the axial direction of the shaft body 110 by a distance L1, and the length of the portion of the limit slide bar 200 beyond the slide groove 111 does not exceed L1. Since the first protrusions 1221 and the second protrusions 1222 are symmetrically disposed, the limiting insertion hole 22 has two opposite side holes 22b, so that the portion of the limiting slide bar 200 beyond the slide slot 111 (the portion overlapping the first head 120) can be conveniently inserted into one of the side holes 22b no matter which direction is rotated 90 degrees, thereby achieving the locking of the first head 120 and the first locking member 20.

Preferably, the overlapping portion of the limit slide bar 200 and the first head 120 is shaped and sized to fit the side hole 22b, so that small-angle rotation between the first head 120 and the first locking member 20 can be avoided when the first head 120 is locked with the first locking member 20, and the stability of the connection between the first head 120 and the first locking member 20 is improved.

In a specific embodiment, the chute 111 includes a guide slot 1111, a limit slot 1112, and a limit through hole 1113 communicating the guide slot 1111 and the limit slot 1112, wherein the guide slot 1111, the limit slot 1112, and the limit through hole 1113 all extend along the axial direction of the shaft 110, one end of the guide slot 1111 extends through the shaft 110 along the axial direction of the shaft 110, and the guide slot 1111 and the limit slot 1112 are formed on two opposite sides of the shaft 110. In the present embodiment, since the guide groove 1111 and the limit groove 1112 are formed on opposite sides of the shaft body 110, respectively, it is possible to improve the degree of balance of the strength of each position of the connection body 100, and to avoid too low strength of some positions of the connection body 100.

Further, the limit sliding rod 200 includes a main sliding rod 210 slidably disposed in the guide groove 1111, a limit rod 220 integrally formed on one side of the main sliding rod 210, and a toggle portion 230 integrally formed on the other side of the main sliding rod 210, the toggle portion 230 extends out of the guide groove 1111 along the radial direction of the shaft body 110, the limit rod 220 passes through the limit through hole 1113 and extends into the limit groove 1112, the elastic member 300 is disposed in the limit groove 1112, one end of the elastic member 300 is abutted on the limit rod 220, and the other end of the elastic member 300 is abutted on the shaft body 110. The distance that the limit slide bar 200 moves in this embodiment is mainly limited by the length of the limit through hole 1113 and the limit groove 1112 in the axial direction of the shaft body 110.

Preferably, the limit through hole 1113 and the limit groove 1112 are flush toward one end of the second head 130, so that the length of the limit groove 1112 and the limit through hole 1113 can be maximally applied.

Further, the guide groove 1111 includes an upper groove 1111a and a lower groove 1111b, the bottom wall of the upper groove 1111a is recessed radially inward to form a lower groove 1111b, one end of the upper groove 1111a penetrates the shaft body 110 in the axial direction of the shaft body 110, the main slide bar 210 includes an upper slide bar 211 provided in the upper groove 1111a and a lower slide bar 212 provided in the lower groove 1111b, in the first state, the end of the lower slide bar 212 toward the first head 120 abuts on the inner wall of the end of the lower groove 1111b toward the first head 120, and the stopper rod 220 abuts on the inner wall of the end of the stopper through hole 1113 toward the first head 120. In this embodiment, the lower groove 1111b and the limit through hole 1113 limit the limit sliding rod 200 at the same time, so that the limit sliding rod 200 is stressed at a plurality of positions, and damage to the limit sliding rod 200 is reduced.

Further, the length of the lower groove 1111b extending in the axial direction of the shaft body 110 is L2, the length of the lower slide bar 212 extending in the axial direction of the shaft body 110 is L3, and the length of the stopper through hole 1113 extending in the axial direction of the shaft body 110 is L4, where L2-l3=l4. In this embodiment, the lengths of the lower groove 1111b, the upper groove 1111a, and the limiting through hole 1113 are set by the formula of L2-l3=l4, so that the insufficient use of the set lower groove 1111b, upper groove 1111a, and limiting through hole 1113 can be avoided, and the connecting body 100 in this embodiment can maintain the required strength to the greatest extent at the colleague who meets the grooving requirement.

To further improve the stability of the connection, in a specific embodiment, the connection device 1 further includes a limiting component, where the limiting component can limit the sliding of the limiting sliding rod 200 from the first state to the second state. The limiting assembly can prevent the limiting slide bar 200 from sliding from the first state to the second state against the elastic force of the elastic piece 300 due to false touch. Further improving the stability of the connection between the first head 120 and the first locking member 20.

In a more specific embodiment, the shaft body 110 is radially provided with a first pin hole along a radial direction thereof, the main sliding rod 210 is provided with a second pin hole, and in the first state, the first pin hole and the second pin hole are aligned, and the limiting assembly comprises a pin shaft detachably penetrating the first pin hole and the second pin hole. In this embodiment, in the first state, the first pin hole and the second pin hole are aligned, and at this time, the pin shaft may be inserted into the first pin hole and the second pin hole, and at this time, the movement of the limit slide bar 200 may be limited, so that the removal of the first head 120 from the first locking member 20 may be limited, thereby further improving the connection stability between the first head 120 and the first locking member 20.

In another more specific embodiment, the shaft portion 110 is provided with a first pin hole extending radially therethrough, the limit slide bar 200 includes a toggle portion 230 extending radially out of the chute 111 along the shaft portion 110, the limit assembly includes a pin detachably penetrating the first pin hole, one end of the pin may extend out of the first pin hole, and the portion extending out of the first pin hole is located on a moving path of the toggle portion 230 when moving from the first state to the second state. In this embodiment, the pin shaft is not required to be installed by punching on the limit sliding rod 200, so that the strength of the limit sliding rod 200 is not reduced, and the first head 120 can be restricted from being removed from the first locking member 20 by matching the first pin hole with the pin shaft, so that the connection stability between the first head 120 and the first locking member 20 is further improved.

In an embodiment, the connection device 1 further comprises a second head 130 arranged opposite the first head 120 and a second locking member 30 for locking with the second head 130.

The second head 130 includes a second central shaft 131 which is the same as the axial direction of the shaft body 110, and an annular protrusion 132 which protrudes outward in the radial direction of the second central shaft 131, and the annular protrusion 132 and the shaft body 110 are disposed at intervals in the axial direction of the shaft body 110 and enclose to form an annular groove 133.

It should be noted that, the radial cross section of the second central shaft 131 is preferably circular, but may be other shapes, such as rectangle, square, waist, etc., and the shape of the annular protrusion 132 may be changed appropriately according to the change of the shape of the second central shaft 131, for example, when the radial cross section of the second central shaft 131 is circular, it is preferable that the radial cross section of the annular protrusion 132 is circular, and the shape of the annular groove 133 is changed according to the change of the shapes of the second central shaft 131 and the annular protrusion 132.

Preferably, the end surface of the annular protrusion 132 away from the shaft body 110 is flush with the end surface of the second central shaft 131 away from the shaft body 110, which is not only beneficial to the production and processing of the second head 130, but also facilitates the connection and cooperation with the second locking member 30.

Referring to fig. 8-12, the second locking member 30 in the present embodiment includes a base 500, a bottom plate 600 and a limiting member 700.

The base 500 is provided with a mounting through hole 510, and the mounting through hole 510 is provided with a first port 511 and a second port 512 which are opposite.

The base plate 600 is disposed on the base 500 and the base plate 600 at least partially covers the first port 511 of the mounting through hole 510, and after the second head 130 is mounted in the mounting through hole 510, at least a portion of the annular protrusion 132 abuts against the base plate 600 (when it is desired to disengage the annular protrusion 132 from the mounting through hole 510 from the first port 511), so that the base plate 600 restricts the annular protrusion 132 from being disengaged from the mounting through hole 510 from the first port 511.

It should be noted that, when the end surface of the annular protrusion 132 away from the shaft body 110 is flush with the end surface of the second central shaft 131 away from the shaft body 110, the bottom plate 600 may completely cover the first port 511, or may be an incomplete cover, as long as the annular protrusion 132 is prevented from being separated from the mounting through hole 510 from the first port 511.

For convenience of description, the surface of the base plate 600 facing the second port 512 and used for sealing the first port 511 is set to be a first plane 610, and it should be noted that, in this embodiment or the embodiments described below, the plane refers to a substantially plane, and not to a plane in absolute sense.

The limiting member 700 is disposed on the base 500, and the limiting member 700 may partially cover the second port 512 of the mounting through hole 510, and the annular protrusion 132 may penetrate into the mounting through hole 510 through a position where the second port 512 is not plugged, where it should be noted that the limiting member 700 in this embodiment cannot completely cover the second port 512, but only needs to leave enough opening area for the annular protrusion 132 to be inserted into the mounting through hole 510 after the limiting member 700 is capped, preferably, the annular protrusion 132 is completely extended into the mounting through hole 510 from the second port 512 along the axial direction of the mounting through hole 510.

In order to achieve the locking between the second locking member 30 and the second head 130, the limiting member 700 is provided with a half shaft hole 710 adapted to the second central shaft 131, the half shaft hole 710 has a notch 720 along the radial direction of the half shaft hole 710, the second central shaft 131 can enter the half shaft hole 710 through the notch 720, it should be noted that the size and shape of the second central shaft 131 and the half shaft hole 710 are substantially the same as those of the half shaft hole 710, and the size of the half shaft hole 710 is slightly larger than that of the second central shaft 131, so that the second central shaft 131 can enter the half shaft hole 710 conveniently, for example, when the cross section of the second central shaft 131 is circular, the radial cross section of the half shaft hole 710 is a semicircle substantially the same as the outer diameter of the second central shaft 131.

For convenience of description, a surface of the stopper 700 for closing the second port 512, which faces the first port 511, is set to be a second plane 730; the minimum distance between the first plane 610 and the second plane 730 is not smaller than the thickness of the annular projection 132 in the axial direction of the second central axis 131.

The thickness of each position of the annular protrusion 132 in the axial direction of the second central axis 131 is uniform.

The method of using the connecting device 1 in this embodiment is as follows: firstly, the second head 130 on the connecting mechanism 10 is inserted into the mounting through hole 510 from the second port 512 until the annular protrusion 132 is completely inserted into the mounting through hole 510, and as the minimum distance between the first plane 610 and the second plane 730 is not smaller than the thickness of the annular protrusion 132 in the axial direction of the second central shaft 131, moving the connecting mechanism 10 along the radial direction of the half shaft hole 710 can enable the second central shaft 131 to move into the half shaft hole 710, when the second central shaft 131 enters the half shaft hole 710, at this time, part of the limiting piece 700 is sleeved in the annular groove 133, one side surface of the annular protrusion 132 facing the shaft body 110 is abutted against the second plane 730, and at this time, the connecting mechanism 10 and the second locking piece 30 are in a locking state; when the locking state of the connecting mechanism 10 and the second locking member 30 needs to be released, the second central shaft 131 is only required to be removed from the half shaft hole 710 along the radial direction of the half shaft hole 710, and at this time, one side surface of the annular protrusion 132 facing the shaft body 110 is not abutted against the second plane 730, and at this time, the annular protrusion 132 can be taken out from the mounting through hole 510. The connection mechanism 10 in this embodiment is connected with the second locking member 30, and is convenient and quick to detach, so that the working efficiency can be improved.

Preferably, the first plane 610 and the second plane 730 are disposed in parallel, and the distance between the first plane 610 and the second plane 730 is substantially the same as the thickness of the annular protrusion 132 in the axial direction of the second central shaft 131, so as to improve the stability of the fit between the annular protrusion 132 and the mounting through hole 510, where, except for the direction of moving along the radial direction of the half shaft hole 710 toward the notch 720, the second locking member 30 or the connecting mechanism 10 is not easily moved out of the half shaft hole 710 by the force of other directions, and especially when the first plane 610 covers most of the first ports 511, the second central shaft 131 is not easily moved out of the half shaft hole 710.

Preferably, the second central shaft 131 is integrally formed with the annular protrusion 132, and the base 500, the bottom plate 600, and the limiting member 700 are integrally formed. Further, the connection strength of the connection device 1 in the present embodiment can be improved.

Since the limiting member 700 needs to maintain the connection strength with the base 500 under a large pressure, the limiting member 700 and the base 500 in this embodiment have the first connection surface 741 and the second connection surface 742, the first connection surface 741 is connected to the inner wall of the mounting through hole 510, the second connection surface 742 is connected to the plane of the second port 512 of the base 500, and the connection strength between the base 500 and the limiting member 700 can be greatly improved by connecting the first connection surface 741 and the second connection surface 742 with the base 500 on the premise that the base 500 is prevented from being too large in both the axial direction and the radial direction of the mounting through hole 510.

In a specific embodiment, the radial section of the second central shaft 131 is circular, the radial section of the annular protrusion 132 is circular, the radial section of the half-shaft hole 710 is semicircular, the second plane 730 is an annular surface and is coaxial with the half-shaft hole 710, and the difference obtained by subtracting the inner diameter from the outer diameter of the annular surface is not smaller than the difference obtained by subtracting the outer diameter of the second central shaft 131 from the outer diameter of the annular protrusion 132. In this embodiment, the difference obtained by subtracting the inner diameter from the outer diameter of the annular surface is not smaller than the difference obtained by subtracting the outer diameter of the second central shaft 131 from the outer diameter of the annular protrusion 132, so that it can be ensured that after the second central shaft 131 completely enters the half-shaft hole 710, one side surface of the annular protrusion 132 facing the shaft body 110 can be all abutted on the second plane 730, so that the contact area between the annular protrusion 132 and the limiting member 700 can be increased, the connection strength between the second locking member 30 and the connection mechanism 10 can be improved, and the connection device 1 in this embodiment can be enabled to bear heavier objects.

Further, the radial cross section of the mounting through hole 510 is a waist-shaped surface, the waist-shaped surface includes two semicircular surfaces and a rectangular surface, the diameter of the semicircular surface is adapted to the outer diameter of the annular protrusion 132, it should be noted that the diameter of the semicircular surface is substantially the same as the outer diameter of the annular protrusion 132, and the diameter of the semicircular surface is slightly larger than the outer diameter of the annular protrusion 132. Since the radial cross section of the installation through hole 510 is a waist-shaped surface, and the diameter of the semicircle surface of the waist-shaped surface is adapted to the outer diameter of the annular protrusion 132, the movement path of the annular protrusion 132 in the installation through hole 510 is limited, and the annular protrusion can only move along the preset direction, thereby improving the operation convenience of the user and the efficiency of connection or disassembly.

Further, the distance between the centers of the two semicircular surfaces of the waist-shaped surface is smaller than the outer diameter of the annular protrusion 132, a circle made by the radius of one semicircular surface and the center of the circle on the plane of the second plane 730 is set as a reference circle, and the second plane 730 is not overlapped with the reference circle in the axial direction of the mounting through hole 510. The reference surface in this embodiment is substantially the same as the outer circumference of the radial cross section of the annular projection 132, and since the second plane 730 and the reference surface do not coincide in the axial direction of the mounting through hole 510, it is ensured that the annular projection 132 can enter the mounting through hole 510 from the second port 512.

In a specific embodiment, the second locking member 30 further includes a mounting seat 800 for mounting the base 500, the mounting seat 800 is provided with a mounting groove 810 and a limiting hole 820 communicated with the mounting groove 810, the limiting hole 820 is matched with the annular protrusion 132 in size and shape, the base 500 is slidably disposed in the mounting groove 810, the second port 512 faces the limiting hole 820, the base 500 is at least slidable to a third state and a fourth state, and in the third state, the annular protrusion 132 can enter the mounting through hole 510 through the second port 512 after passing through the limiting hole 820; the second central shaft 131 can enter the half shaft hole 710 through the notch 720 by moving the driving base 500 relative to the assembly groove 810, and the base 500 is in the fourth state. The method of using the connecting device 1 in this embodiment is as follows: when the base 500 is moved to the third state, the second head 130 is inserted into the limiting hole 820 until the annular protrusion 132 enters the mounting through hole 510 from the second port 512, and then the base 500 is moved, such that the half shaft hole 710 on the limiting member 700 is sleeved in the annular groove 133, that is, such that the second central shaft 131 enters the half shaft hole 710 from the notch 720, at this time, the second plane 730 can limit the annular protrusion 132 to be disengaged from the mounting through hole 510, and in addition, due to the limitation of the limiting hole 820 on the second head 130 in the radial direction of the limiting hole 820, when the base 500 is in the fourth state, the connection stability between the second locking member 30 and the connection mechanism 10 can be ensured. When the connection mechanism 10 needs to be detached from the second locking member 30, the base 500 can be converted from the fourth state to the third state by moving the base 500, and at this time, the connection mechanism 10 can be removed from the second locking member 30.

Further, the stopper 700 is formed with an inclined surface 750, and the second plane 730 is located in the inclined surface 750 on the projection surface of the mounting through hole 510 in the axial direction, and the inclined surface 750 has a sub-projection surface on the projection surfaces of the mounting through hole 510 in the axial direction and the radial direction, and the distance from the position of the inclined surface 750 closer to the notch 720 to the plane of the second port 512 is preferably 0 on the position of the inclined surface 750 corresponding to the notch 720 to the plane of the second port 512. In this embodiment, since the second plane 730 is located in the inclined plane 750 on the projection plane of the axial direction of the mounting through hole 510, after the first head 120 extends into the limiting hole 820, the annular protrusion 132 can smoothly enter the mounting through hole 510 from the second port 512 no matter the base 500 is in the third state or the fourth state, specifically, when the base 500 is in the third state, the annular protrusion 132 can smoothly enter the mounting through hole 510 from the second port 512 at this time, when the base 500 is in the fourth state, the annular protrusion 132 can be pressed against the inclined plane 750 during the movement into the mounting through hole 510, and the base 500 can move relative to the assembly groove 810 due to the pressing of the annular protrusion 132 against the inclined plane 750, so that the base 500 can be converted from the fourth state to the third state, and the annular protrusion 132 can smoothly enter the mounting through hole 510 from the second port 512.

Further, the second locking member 30 further includes a spring member 910 and a pressing member 920, wherein the spring member 910 is disposed between the base 500 and the mounting base 800, and when no external force is applied, the elastic force of the spring member 910 acting on the base 500 can drive the base 500 to move from the third state to the fourth state. In this embodiment, the spring member 910 can maintain the base 500 in the fourth state without being subjected to an external force greater than the elastic force, so that the second head 130 is prevented from being separated from the second locking member 30 due to the base 500 being carelessly shifted from the fourth state to the third state, and the risk can be avoided. In addition, due to the inclined surface 750, the base 500 can be converted from the fourth state to the third state by pressing the inclined surface 750 during the process of inserting the second head 130 from the limiting hole 820 into the mounting through hole 510, and after the annular protrusion 132 is mounted into the mounting through hole 510, the base 500 is converted from the third state to the fourth state under the action of the spring member 910. The locking between the second head 130 and the second locking member 30 is achieved without manually moving the base 500 during the entire process of inserting the second head 130.

Further, a guide through hole 830 communicating with the assembly groove 810 is formed in the mounting base 800, an axial direction of the guide through hole 830 is the same as a moving direction of the base 500 relative to the assembly groove 810, one end of the pressing member 920 movably disposed in the guide through hole 830 along the axial direction of the guide through hole 830 abuts against the base 500, and the other end of the pressing member 920 extends out of the guide through hole 830 in a direction away from the assembly groove 810. When the base 500 needs to be moved, the state of the base 500 can be changed by moving the pressing member 920, so that when the second head 130 needs to be removed from the second locking member 30, the base 500 can be moved to the third state by moving the pressing member 920, and at this time, the second head 130 can be removed from the second locking member 30.

In a specific embodiment, the connection device 1 further includes a safety member 930, the mounting base 800 is provided with a guide chute 840, the safety member 930 is slidably disposed in the guide chute 840, and the safety member 930 is at least capable of sliding to a first position, in which at least a portion of the safety member 930 is located on a path along which the base 500 or the bottom plate 600 or the limiting member 700 moves and does not extend into the mounting through hole 510, and a second position, in which the safety member 930 is not disposed on a path along which the base 500 or the bottom plate 600 or the limiting member 700 moves, in which the safety member 930 is capable of limiting the base 500 from the fourth state to the third state when the base 500 is in the fourth state and the safety member 930 is located in the first position. In this embodiment, as long as the safety member 930 is located at the first position, the base 500 is prevented from being changed from the fourth state to the third state by touching the pressing member 920 by mistake, so that the second locking member 30 is connected to the connecting mechanism 10 more stably in this embodiment, and the safety performance is further improved.

Further, the safety seat includes a limiting channel wall 850 for enclosing a part of the limiting hole 820, the limiting component is the limiting channel wall 850, and when the second head 130 is locked with the second locking member 30, an end of the limiting channel wall 850 facing the second head 130 is located on a path along which the toggle portion 230 moves when the first state is changed to the second state. Since the end of the limiting channel wall 850 facing the second head 130 is located on the path along which the toggle part 230 moves when the second head 130 is locked with the second locking member 30, the limiting channel wall 850 can limit the movement of the toggle part 230 when the first state of the limiting slide bar 200 is changed from the first state to the second state, so that the first head 120 and the first locking member 20 cannot be removed when the second head 130 and the second locking member 30 are not separated, the connection manner of the second head 130 and the second locking member 30 in the above embodiment can be known, after the first head 120 and the second head 130 are connected with the first locking member 20 and the second locking member 30 respectively, in order to separate the first locking member 20 from the first head 120, the second head 130 needs to be separated from the second locking member 30 first, and the safety member 930 needs to be moved to the first position, then the pressing member 920 needs to be moved so that the base 500 is located in the third state, then the second head 130 can be connected with the first locking member 30 rapidly and the second locking member 20 can be further connected with the first locking member 20 and the second locking member 30 rapidly and the first locking member 20 can be further connected with the first locking member 20 in a vibration device 1.

In an embodiment, the shaft body 110 includes a first shaft portion 113 and a second shaft portion 114 integrally formed on the first shaft portion 113, the outer diameter of the first shaft portion 113 is larger than the outer diameter of the second shaft portion 114, a step 1134 is formed between the first shaft portion 113 and the second shaft portion 114, the sliding groove 111 is formed on the second shaft portion 114, the connecting mechanism 10 further includes a casing 400, the casing 400 is sleeved on the second shaft portion 114, a sliding hole 410 is formed on the casing 400 at a position corresponding to the sliding groove 111, the length of the second shaft portion 114 is the same as the length of the casing 400, and one end of the casing 400 is abutted to the step 1134. In this embodiment, most of the sliding groove 111 can be covered by the housing 400, so that the spring member 910 and the limit slide bar 200 can be prevented from being separated from the sliding groove 111. Next, since the shaft body 110 includes the first shaft portion 113 and the second shaft portion 114 integrally formed on the first shaft portion 113, and the sliding groove 111 is formed on the second shaft portion 114, the shaft body 110 can be manufactured by a simple machining method, and the sliding groove 111 is formed on the shaft body 110.

Further, the shaft body 110, the first head 120 and the second head 130 are integrally formed. The connecting body 100 in this embodiment is not only manufactured by simple machining, but also has high strength and can carry a heavier object.

In a specific application scenario, the second locking member 30 is connected to the lamp, the first locking member 20 is connected to a pipe clamp, the pipe clamp can be fixed to a pipe, the first head 120 of the connection mechanism 10 is connected to the first locking member 20, and the second head 130 of the connection mechanism 10 is connected to the second locking member 30, so as to fix the lamp to the pipe.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A connection device, characterized in that the connection device comprises a connection mechanism and a first locking member; the connecting mechanism comprises:

the elastic piece is arranged in the sliding groove, one end of the elastic piece is abutted against the limiting sliding rod, the other end of the elastic piece is abutted against the shaft body, and when no external force is applied, the elastic force of the elastic piece acting on the limiting sliding rod can drive the limiting sliding rod to maintain in the first state;

The first head part comprises a first central shaft which is the same as the axial direction of the shaft body part and a protruding part which is formed by protruding outwards along the radial direction of the first central shaft, wherein the protruding part and the shaft body part are arranged at intervals in the axial direction of the shaft body part, and the interval is L1; the first locking piece is formed with the holding chamber and with the spacing jack of holding chamber intercommunication, the axial depth of spacing jack is less than L1, spacing jack include with the center pin hole that the first center pin corresponds and with the side opening that the protrusion corresponds when the second state, first head has one end of protrusion can be passed through spacing jack inserts in the holding chamber, and when first head is relative first locking piece rotates preset angle, spacing slide bar with first head overlaps the part and is moved to in the side opening under the drive of elastic component.

2. The connecting device according to claim 1, wherein the protruding portion includes a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion are disposed at intervals around a central axis of the first central axis, and the first protruding portion and the second protruding portion are disposed symmetrically, the first protruding portion and the second protruding portion are disposed at intervals in an axial direction of the shaft portion with a spacing L1, and a length of a portion of the limit slide bar exceeding the slide groove is not more than L1.

3. The connection device according to claim 2, wherein the portion of the limit slide bar overlapping the first head is shaped and sized to fit the side hole.

4. The connecting device according to claim 1, wherein the slide groove comprises a guide groove, a limit groove and a limit through hole which communicates the guide groove and the limit groove, the guide groove, the limit groove and the limit through hole all extend along the axial direction of the shaft portion, one end of the guide groove penetrates through the shaft portion along the axial direction of the shaft portion, the guide groove and the limit groove are respectively formed on two opposite sides of the shaft portion, the limit slide bar comprises a main slide bar which is slidably arranged in the guide groove, a limit rod which is integrally formed on one side of the main slide bar, and a toggle part which is integrally formed on the other side of the main slide bar, the toggle part extends out of the guide groove along the radial direction of the shaft portion, the limit rod penetrates through the limit through hole and extends into the limit groove, the elastic piece is arranged in the limit groove, one end of the elastic piece is abutted on the limit rod, and the other end of the elastic piece is abutted on the shaft portion.

5. The connecting device according to claim 4, wherein the guide groove includes an upper groove portion and a lower groove portion, a bottom wall of the upper groove portion is recessed radially inward to form the lower groove portion, one end of the upper groove portion penetrates the shaft portion in an axial direction of the shaft portion, the main slide bar includes an upper slide bar portion provided in the upper groove portion and a lower slide bar portion provided in the lower groove portion, and in the first state, an end portion of the lower slide bar portion toward the first head portion abuts on an inner wall of the lower groove portion toward an end of the first head portion, and the stopper bar abuts on an inner wall of the stopper through hole toward an end of the first head portion.

6. The connecting device according to claim 5, wherein the length of the lower groove portion extending in the axial direction of the shaft portion is L2, the length of the lower slide bar portion extending in the axial direction of the shaft portion is L3, and the length of the limiting through hole extending in the axial direction of the shaft portion is L4, wherein L2-l3=l4.

7. The connection device of claim 4, further comprising a limit assembly capable of limiting sliding movement of the limit slide bar from the first state to the second state.

8. The connection device of claim 7, wherein the shaft body has a first pin hole radially extending therefrom, the main slide bar has a second pin hole, and the first pin hole and the second pin hole are aligned in the first state, and the limit assembly includes a pin detachably disposed in the first pin hole and the second pin hole.

9. The connection device of claim 7, wherein the shaft portion has a first pin hole extending radially therethrough, the limit slide bar includes a toggle portion extending radially from the shaft portion to the slide slot, the limit assembly includes a pin detachably disposed in the first pin hole, one end of the pin extends out of the first pin hole, and a portion extending out of the first pin hole is located on a path of movement of the limit slide bar from the first state to the second state.

10. The connection device of claim 1, further comprising a second head disposed opposite the first head and a second locking member for locking with the second head.

11. The connection device of claim 10, wherein the limit slide bar includes a toggle portion extending radially out of the slide slot along the shaft portion, and wherein an end of the second locking member facing the second head portion is located on a path along which the toggle portion moves when moving from the first state to the second state when the second head portion is locked with the second locking member.

12. The connection device according to claim 10, wherein the second head portion includes a second central axis identical to an axial direction of the shaft body portion and an annular projection formed to project radially outward of the second central axis, the annular projection being disposed at a spacing from the shaft body portion in the axial direction of the shaft body portion.

13. The connecting device according to claim 11, wherein the shaft body portion includes a first shaft portion and a second shaft portion integrally formed on the first shaft portion, the outer diameter of the first shaft portion is larger than the outer diameter of the second shaft portion, a step is formed between the first shaft portion and the second shaft portion, the sliding groove is formed in the second shaft portion, the connecting mechanism further includes a sleeve, the sleeve is sleeved on the second shaft portion, a sliding hole is formed in a position, corresponding to the sliding groove, of the sleeve, the length of the second shaft portion is the same as that of the sleeve, and one end of the sleeve abuts against the step.

14. The connection device of claim 10, wherein the shaft body, the first head, and the second head are integrally formed.