A sleeve assembly based on bevel locking

Abstract

This application discloses a sleeve assembly based on inclined plane locking, comprising: a hollow outer sleeve with an axially movable sliding inner tube movably disposed therein; a rotating platform rotatably disposed on the outer sleeve, with the sliding inner tube passing through the rotating platform; a wedge block radially movable disposed on the outer sleeve; and a driving inclined plane disposed on the inner sidewall of the rotating platform. In the locked state, the driving inclined plane of the rotating platform is tightly fitted with the wedge block. When the rotating platform rotates, the driving inclined plane moves away from the wedge block to unlock the wedge block and the sliding inner tube. This invention employs an inclined plane transmission locking mechanism, utilizing the self-locking characteristic of the inclined plane to achieve locking. Compared with traditional knob locking methods, the inclined plane transmission locking mechanism does not rely on the tightness of the knob, but achieves stable locking through the relative movement of the inclined plane. This design avoids the problem of insecure locking or knob damage caused by uneven knob tightening force, significantly improving the stability of the support device during shooting, and maintaining a reliable locked state even in complex environments.

Description

Technical Field

[0001] This utility model particularly relates to a sleeve assembly based on inclined plane locking. Background Technology

[0002] In the field of photographic equipment, the sleeve assembly is a key component for achieving stable shooting. Existing sleeve assemblies consist of a hollow outer sleeve containing an axially movable sliding inner sleeve. The outer sleeve and the sliding inner sleeve are locked together by a knob, a locking method that requires repeatedly tightening and loosening the knob to lock and unlock. The knob locking mechanism relies on the tightness of the knob to achieve locking. In practical use, the tightening force of the knob is difficult to control precisely, easily resulting in under-tightening or over-tightening. Under-tightening may cause the support device to loosen during shooting, affecting shooting stability; over-tightening may damage the knob or make it difficult to unlock. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a sleeve assembly based on inclined plane locking.

[0004] To solve the aforementioned technical problems, this utility model adopts the following technical solution:

[0005] A sleeve assembly based on bevel locking, comprising:

[0006] The hollow outer tube has an axially movable sliding inner tube inside.

[0007] A rotating platform is rotatably mounted on the outer sleeve, and the sliding inner tube passes through the rotating platform;

[0008] A wedge-shaped block is radially movable and disposed on the outer sleeve;

[0009] A driving inclined plane is provided on the inner side wall of the rotary table;

[0010] In the locked state, the driving inclined surface of the rotary table is in close contact with the wedge block. When the rotary table rotates, the driving inclined surface moves away from the wedge block to unlock the wedge block and the sliding inner tube.

[0011] Preferably, at least two wedges are evenly arranged circumferentially, and the inclined surface of each wedge matches the driving inclined surface inside the rotary table.

[0012] Preferably, the inner side of the rotary table is provided with inclined blocks of the same number as the wedge blocks, and each inclined block is provided with the driving inclined surface, and each inclined block drives one wedge block.

[0013] Preferably, the end of the outer tube is provided with an annular end face, and an arc-shaped guide groove is formed on the annular end face. The inclined block is provided with a guide block that slides with the arc-shaped guide groove. When the guide block contacts the end of the arc-shaped guide groove, it restricts the rotation angle of the rotary table relative to the outer tube.

[0014] Preferably, a positioning ring is fixedly provided on the annular end face, and the positioning ring is provided with a limiting groove corresponding to the wedge block in a circumferentially spaced manner. The wedge block moves in the limiting groove under the driving action of the inclined block to abut against the sliding inner tube.

[0015] Preferably, at least two or more circumferentially distributed fixing blocks are fixedly disposed on the annular end face; each fixing block is connected to a corresponding inclined block by a first spring.

[0016] Preferably, the sliding inner tube has a trigger block rotatably disposed at the end away from the annular end face; the outer tube includes multiple circumferentially distributed connecting parts and a positioning platform slidably disposed on the sliding inner tube, each connecting part being rotatably connected to the positioning platform, and the rotating platform being rotatably disposed on the positioning platform; the multiple connecting parts together form a limiting channel for accommodating the sliding inner tube, and the ends of each connecting part form a limiting opening; wherein, when the trigger block is pressed into the limiting opening, the rotating platform can move along the axial direction of the sliding inner tube, driving the positioning platform to rotate and unfold in conjunction with the connecting parts.

[0017] Preferably, the inner peripheral wall of the rotary table is provided with a guide protrusion; the outer wall of the sliding inner tube is provided with an axially extending stroke groove; the guide protrusion and the stroke groove are slidably engaged to guide the rotary table along the axial movement trajectory of the sliding inner tube; the lower end of the sliding inner tube is provided with an inner tube inclined surface, and the rotary table moves along the axial direction of the sliding inner tube so that the wedge block abuts against the inner tube inclined surface with an interference fit to achieve locking.

[0018] Preferably, each connecting part is hinged with a transmission arm, and the sliding inner tube is provided with a support ring at one end away from the annular end face, and the other end of each transmission arm is hinged to the support ring; when the rotary table moves axially in the direction of the trigger block, the connecting part drives the transmission arm to rotate around the support ring, so that the connecting part and the transmission arm unfold.

[0019] Preferably, the sliding inner tube is provided with a rotating shaft, a mounting seat is movably provided on the rotating shaft, a trigger block is rotatably provided on the mounting seat, and a second spring is wound on the rotating shaft. One end of the second spring is connected to the sliding inner tube, and the other end is connected to the mounting seat. The end of the connection part can be snapped onto the mounting seat by a snap-fit ​​structure.

[0020] The beneficial effects of this utility model are:

[0021] This invention employs a sloped-plane transmission locking mechanism, utilizing the self-locking property of the sloped plane to achieve locking. Compared to traditional knob locking methods, the sloped-plane transmission locking mechanism does not rely on the tightness of the knob, but rather achieves stable locking through the relative movement of the sloped plane. This design avoids problems such as insecure locking or knob damage caused by uneven knob tightening force, significantly improving the stability of the support device during shooting and maintaining a reliable locked state even in complex environments. Furthermore, locking and unlocking operations can be completed with a simple rotational motion; compared to existing technologies, this design greatly shortens operation time and improves operational efficiency. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 4 ;

[0027] Figure 5 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 5 ;

[0028] Figure 6 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 6 ;

[0029] Figure 7 This is a schematic diagram of the unfolded sleeve assembly based on inclined plane locking according to this application. Figure 1 ;

[0030] Figure 8 This is a schematic diagram of the unfolded sleeve assembly based on inclined plane locking according to this application. Figure 2 ;

[0031] Figure 9 This is a schematic diagram of the structure of a sleeve assembly based on inclined plane locking according to this application. Figure 7 . Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0033] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0034] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, soldering, snap-fitting, or embedding to suitably replace it.

[0035] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0036] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0037] A sleeve assembly based on inclined plane locking, referenced Figures 1-6 ,include:

[0038] The hollow outer tube 1 has an axially movable sliding inner tube 2 inside it;

[0039] A rotating platform 3 is rotatably mounted on the outer sleeve 1, and the sliding inner tube 2 passes through the rotating platform 3;

[0040] The wedge-shaped block 4 is radially movable and disposed on the outer sleeve 1;

[0041] The driving inclined surface 5 is located on the inner side wall of the rotary table 3;

[0042] In the locked state, the driving inclined surface 5 of the rotary table 3 is in close contact with the wedge block 4. When the rotary table 3 rotates, the driving inclined surface 5 moves away from the wedge block 4 to unlock the wedge block 4 and the sliding inner tube 2.

[0043] Furthermore, at least two wedge blocks 4 are evenly arranged circumferentially, and the inclined surface of each wedge block 4 cooperates with the driving inclined surface 5 on the inner side of the rotary table 3.

[0044] Furthermore, the inner side of the rotary table 3 is provided with inclined blocks 50 in the same number as the wedge blocks 4, and each inclined block 50 is provided with the driving inclined surface 5, and each inclined block 50 drives one wedge block 4.

[0045] Furthermore, the end of the outer tube 1 is provided with an annular end face 1-1, and an arc-shaped guide groove 6 is provided on the annular end face 1-1. The inclined block 50 is provided with a guide block 51 that slides with the arc-shaped guide groove 6. When the guide block 51 contacts the end of the arc-shaped guide groove 6, it restricts the rotation angle of the rotary table 3 relative to the outer tube 1.

[0046] Furthermore, a positioning ring 7 is fixedly provided on the annular end face 1-1. The positioning ring 7 is circumferentially spaced with limiting grooves 70 corresponding to the wedge block 4. The wedge block 4 moves within the limiting grooves 70 under the driving action of the inclined block 50 to press against the sliding inner tube 2.

[0047] Furthermore, at least two or more circumferentially distributed fixing blocks 8 are fixedly provided on the annular end face 1-1; each fixing block 8 is connected to the corresponding inclined block 50 by a first spring 81.

[0048] Furthermore, the sliding inner tube 2 has a trigger block 9 rotatably disposed at the end away from the annular end face 1-1; the outer tube 1 includes multiple circumferentially distributed connecting parts 11 and a positioning platform 12 slidably disposed on the sliding inner tube 2, each connecting part 11 being rotatably connected to the positioning platform 12, and the rotating platform 3 being rotatably disposed on the positioning platform 12; the multiple connecting parts 11 together form a limiting channel for accommodating the sliding inner tube 2, and the ends of each connecting part 11 form a limiting opening 110; wherein, when the trigger block 9 is pressed until it enters the limiting opening 110, the rotating platform 3 can move axially along the sliding inner tube 2, driving the positioning platform 12 to rotate and unfold in conjunction with the connecting parts 11.

[0049] Furthermore, the inner peripheral wall of the rotary table 3 is provided with a guide protrusion 61; the outer wall of the sliding inner tube 2 is provided with an axially extending stroke groove 611; the guide protrusion 61 and the stroke groove 611 are slidably engaged to guide the rotary table 3 along the axial movement trajectory of the sliding inner tube 2; the lower end of the sliding inner tube 2 is provided with an inner tube inclined surface 20, and the rotary table 3 moves along the axial direction of the sliding inner tube 2 so that the wedge block 4 abuts against the inner tube inclined surface 20 to achieve an interference fit and lock.

[0050] Furthermore, each connecting part 11 is hinged with a transmission arm 110, and the sliding inner tube 2 is provided with a support ring 112 at one end away from the annular end face 1-1, and the other end of each transmission arm 110 is hinged to the support ring 112; when the rotary table 3 moves axially in the direction of the trigger block 9, the connecting part 11 drives the transmission arm 110 to rotate around the support ring 112, so that the connecting part 11 and the transmission arm 110 unfold.

[0051] Furthermore, a rotating shaft 21 is provided on the sliding inner tube 2, and a mounting base 210 is movably provided on the rotating shaft 21. A trigger block 9 is rotatably provided on the mounting base 210. A second spring 22 is wound around the rotating shaft 21. One end of the second spring 22 is connected to the sliding inner tube 2, and the other end is connected to the mounting base 210. The end of the connecting part 11 can be snapped onto the mounting base 210 through the snap-fit ​​structure 211.

[0052] The working principle of this utility model is as follows:

[0053] The sliding inner tube 2 is inserted into the outer tube 1 and can move freely axially within the outer tube 1. A rotary table 3 is installed on the outer periphery of the outer tube 1, and the rotary table 3 can rotate freely around the outer tube 1. The inner side wall of the rotary table 3 is machined with a driving inclined surface 5, and the inclination angle of the driving inclined surface 5 is designed according to actual requirements.

[0054] Multiple wedge-shaped blocks 4 are evenly and circumferentially movable on the annular end face 1-1 at the end of the outer tube 1. The outer inclined surface of the wedge-shaped block 4 cooperates with the driving inclined surface 5 inside the rotary table 3. In the locked state, the driving inclined surface 5 of the rotary table 3 is in close contact with the wedge-shaped block 4, so that the wedge-shaped block 4 and the sliding inner tube 2 are locked together by an interference fit. When the rotary table 3 rotates around the outer tube 1, the driving inclined surface 5 moves away from the wedge-shaped block 4 to unlock the wedge-shaped block 4 and the sliding inner tube 2.

[0055] Based on the above technical solution, in order to enable the wedge block 4 to better act on the sliding inner tube 2, this application provides a positioning ring 7 on the annular end face 1-1. The positioning ring 7 is circumferentially spaced with limiting grooves 70 corresponding to the wedge block 4. As an embodiment 1, regarding the driving inclined surface 5 on the rotary table 3, the same number of inclined blocks 50 as the wedge block 4 can be provided on the inner side of the rotary table 3. Each inclined block 50 is provided with the driving inclined surface 5, and each inclined block 50 drives one wedge block 4. A guide block 5 is provided at the lower end of the inclined block 50. 1. An arc-shaped guide groove 6 is provided on the annular end face 1-1. During the rotation of the rotary table 3, the arc-shaped guide groove 6 has a stroke limiting function on the guide block 51 on the inclined block 50, that is, it limits the rotary table 3 to rotate only within a certain range of rotation angle. This application limits the rotation of the rotary table 3 to 0-35 degrees by the arc-shaped guide groove 6. For example, it can be set that when the rotary table 3 rotates 35 degrees counterclockwise, the inclined block 50 moves away from the wedge block 4, and the wedge block 4 and the sliding inner tube 2 are no longer in an interference fit state and are in an unlocked state.

[0056] Based on the above technical solution, the outer tube 1 of this application includes multiple circumferentially distributed connecting parts 11 and a positioning platform 12 slidably disposed on the sliding inner tube 2. Each connecting part 11 is rotatably connected to the positioning platform 12, and the rotating platform 3 is rotatably disposed on the positioning platform 12. The multiple connecting parts 11 together enclose a limiting channel for accommodating the sliding inner tube 2, and the ends of each connecting part 11 enclose a limiting opening 110. When the trigger block 9 rotates to enter the limiting opening 110, the rotating platform 3 can move axially along the sliding inner tube 2. During the movement of the rotating platform 3, it will drive the positioning platform 12 to rotate and unfold in conjunction with the connecting parts 11. A transmission arm 110 is hinged to the middle section of the connecting part 11, and a support ring 112 is provided at the end of the sliding inner tube 2 away from the annular end face 1-1. Each transmission arm 110 is hinged to the support ring 112. When the rotary table 3 moves axially along the sliding inner tube 2 towards the trigger block 9, the rotary table 3 drives the transmission arm 110 to rotate around the support ring 112 through the linkage positioning table 12 and the connecting part 11, and the connecting part 11 unfolds circumferentially.

[0057] As an example 1, to better illustrate the design concept of this application, this application takes the example of an inner tube inclined surface 20 provided on the outer periphery of the sliding inner tube 2. When the rotary table 3 moves along the sliding inner tube 2 until the wedge block 4 abuts against the inner tube inclined surface 20, the interference fit between the inner tube inclined surface 20 and the wedge block 4 achieves locking. When it is necessary to close the sleeve assembly, it is necessary to unlock the rotary table 3 and the inner tube inclined surface 20. When unlocking, the rotary table 3 is rotated so that the rotary table 3 drives the inclined block 50 to move away from the wedge block 4. At this time, the wedge block 4 and the inner tube inclined surface 20 are no longer in an interference fit state, that is, the rotary table 3 can move along the sliding inner sleeve 2 away from the trigger block 9. Thus, the rotary table 3 drives the connecting part 11 and the transmission arm 110 to close.

[0058] Based on the above technical solutions, such as Figure 9 As shown, this application has a rotating shaft 21 on the sliding inner tube 2, a mounting base 210 on the rotating shaft 21, and a trigger block 9 rotatably mounted on the mounting base 210. A second spring 22 is wound around the rotating shaft 21, with one end of the second spring 22 connected to the sliding inner tube 2 and the other end connected to the mounting base 210. The end of the connecting part 11 can be snapped onto the mounting base 210 via a snap-fit ​​structure 211. Rotating the trigger block 9 causes it to enter the limiting port 110, and then pressing the trigger block 9 causes the mounting base 210 to move and compress the second spring 22. At this time, the end of the connecting part 11 is released from the snap-fit ​​connection with the mounting base 210, so the connecting part 11 can be extended by moving the rotating table 3. When it is necessary to retract the sleeve assembly, The rotating table 3 moves axially along the sliding inner tube 2 in the opposite direction to the trigger block 9, and the retractable connecting part 11 forms a limiting channel. At this time, the second spring 22 recovers its deformation and drives the mounting base 210 to return to its initial state. At this time, pressing the end of the connecting part 11 can engage with the mounting base 210. Finally, the trigger block 9 is rotated so that it cannot enter the limiting port 110 under the action of external force. As an embodiment 2, this application provides a foot pad 111 on the end of the connecting part 11. During transportation or carrying, due to the abutment between the foot pad 111 and the trigger block 9, even if an external force (such as a collision during transportation or carrying) presses the trigger block 9, the trigger block 9 cannot enter the limiting port 110, so that the sleeve assembly remains in a retracted and locked state.

[0059] Based on the above technical solution, this application also provides a fixing block 8 on the annular end face 1-1, and a first spring 81 between the fixing block 8 and the inclined block 50. The function of the first spring 81 is to provide a preload force to the inclined block 50. For example, when the inner tube inclined surface 20 and the wedge block 4 form a locked state through interference fit, due to the preload force of the first spring 81, the rotary table 3 will not easily rotate due to vibration or other external forces, thereby ensuring the stability of the locked state.

[0060] This invention employs a sloped-plane transmission locking mechanism, utilizing the self-locking property of the sloped plane to achieve locking. Compared to traditional knob locking methods, the sloped-plane transmission locking mechanism does not rely on the tightness of the knob, but rather achieves stable locking through the relative movement of the sloped plane. This design avoids problems such as insecure locking or knob damage caused by uneven knob tightening force, significantly improving the stability of the support device during shooting, and maintaining a reliable locked state even in complex environments (such as vibration, external forces, or temperature changes). Furthermore, unlocking can be completed with a simple rotation, greatly shortening operation time and improving operational efficiency compared to existing technologies.

[0061] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A sleeve assembly based on inclined plane locking, characterized in that, include: A hollow outer tube (1) has an axially movable sliding inner tube (2) inside it; A rotating platform (3) is rotatably mounted on the outer sleeve (1), and the sliding inner tube (2) passes through the rotating platform (3); A wedge-shaped block (4) is radially movable and disposed on the outer sleeve (1); A driving inclined plane (5) is provided on the inner side wall of the rotary table (3); In the locked state, the driving inclined surface (5) of the rotary table (3) is in close contact with the wedge block (4). When the rotary table (3) rotates, the driving inclined surface (5) moves away from the wedge block (4) to unlock the wedge block (4) and the sliding inner tube (2).

2. The sleeve assembly based on inclined plane locking according to claim 1, characterized in that, At least two wedge blocks (4) are evenly arranged circumferentially, and the inclined surface of each wedge block (4) is matched with the driving inclined surface (5) inside the rotary table (3).

3. A sleeve assembly based on inclined plane locking according to claim 1, characterized in that, The inner side of the rotary table (3) is provided with inclined blocks (50) in the same number as the wedge blocks (4), and each inclined block (50) is provided with the driving inclined surface (5), and each inclined block (50) drives one wedge block (4).

4. A sleeve assembly based on inclined plane locking according to claim 3, characterized in that, The end of the outer tube (1) is provided with an annular end face (1-1), and an arc-shaped guide groove (6) is provided on the annular end face (1-1). The inclined block (50) is provided with a guide block (51) that slides with the arc-shaped guide groove (6). When the guide block (51) contacts the end of the arc-shaped guide groove (6), it restricts the rotation angle of the rotary table (3) relative to the outer tube (1).

5. A sleeve assembly based on inclined plane locking according to claim 4, characterized in that, A positioning ring (7) is fixedly provided on the annular end face (1-1). The positioning ring (7) is circumferentially spaced with limiting grooves (70) corresponding to the wedge block (4). The wedge block (4) moves in the limiting groove (70) under the driving action of the inclined block (50) to abut against the sliding inner tube (2).

6. A sleeve assembly based on inclined plane locking according to claim 4, characterized in that, At least two or more circumferentially distributed fixing blocks (8) are fixedly provided on the annular end face (1-1); each fixing block (8) is connected to the corresponding inclined block (50) by a first spring (81).

7. A sleeve assembly based on inclined plane locking according to claim 1, characterized in that, The sliding inner tube (2) has a trigger block (9) rotatably mounted at one end away from the annular end face (1-1); the outer tube (1) includes multiple circumferentially distributed connecting parts (11) and a positioning platform (12) slidably mounted on the sliding inner tube (2), each connecting part (11) is rotatably connected to the positioning platform (12), and the rotating platform (3) is rotatably mounted on the positioning platform (12); the multiple connecting parts (11) together form a limiting channel for accommodating the sliding inner tube (2), and the ends of each connecting part (11) form a limiting opening (110); when the trigger block (9) is pressed into the limiting opening (110), the rotating platform (3) can move axially along the sliding inner tube (2), driving the positioning platform (12) to rotate and unfold in conjunction with the connecting parts (11).

8. A sleeve assembly based on inclined plane locking according to claim 1, characterized in that, The inner circumferential wall of the rotary table (3) is provided with a guide protrusion (61); the outer wall of the sliding inner tube (2) is provided with an axially extending stroke groove (611); the guide protrusion (61) and the stroke groove (611) are slidably engaged to guide the rotary table (3) along the axial movement trajectory of the sliding inner tube (2); the lower end of the sliding inner tube (2) is provided with an inner tube inclined surface (20), and the rotary table (3) moves along the axial direction of the sliding inner tube (2) so that the wedge block (4) abuts against the inner tube inclined surface (20) to achieve an interference fit and locking.

9. A sleeve assembly based on inclined plane locking according to claim 1, characterized in that, Each connecting part (11) is hinged with a transmission arm (110). The sliding inner tube (2) has a support ring (112) at one end away from the annular end face (1-1). The other end of each transmission arm (110) is hinged to the support ring (112). When the rotary table (3) moves axially toward the trigger block (9), the connecting part (11) drives the transmission arm (110) to rotate around the support ring (112), so that the connecting part (11) and the transmission arm (110) unfold.

10. A sleeve assembly based on inclined plane locking according to claim 7, characterized in that, A rotating shaft (21) is provided on the sliding inner tube (2), and a mounting seat (210) is movably provided on the rotating shaft (21). A trigger block (9) is rotatably provided on the mounting seat (210). A second spring (22) is wound around the rotating shaft (21). One end of the second spring (22) is connected to the sliding inner tube (2), and the other end is connected to the mounting seat (210). The end of the connecting part (11) can be snapped onto the mounting seat (210) through the snap-fit ​​structure (211).

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