Rotation locking mobile phone support

Abstract

The utility model relates to the technical field of mobile phone supports, in particular to a rotary locking mobile phone support which comprises a supporting frame, a mobile phone clamp, a rotating shaft piece, a locking assembly and a rotating cap, and a connecting part is arranged on the supporting frame; the mobile phone clamp comprises a clamping main body and a rotating part, and the rotating part is arranged on one side of the clamping main body; the rotating shaft piece is connected with the rotating part and the connecting part, so that the rotating part is rotationally connected to the connecting part; the locking assembly comprises an elastic clamping piece and a limiting groove, the elastic clamping piece is arranged on one of the connecting part and the rotating part, the limiting groove is formed in the other one of the connecting part and the rotating part, and the elastic clamping piece can be clamped into the limiting groove; the rotating cap is arranged on the rotating shaft piece in a sleeving mode and rotationally connected to the rotating shaft piece, a pressing piece is arranged on the rotating cap, and after the rotating cap rotates, the pressing piece abuts against the elastic clamping piece so that the elastic clamping piece can retreat from the limiting groove. The position of the mobile phone clamp can be adjusted, the mobile phone clamp can be locked after the position is adjusted, the stability of the mobile phone clamp is better, and shooting of a mobile phone is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of mobile phone holders, specifically to a rotating locking mobile phone holder. Background Technology

[0002] The camera stand for shooting with a mobile phone is different from that for shooting with a regular camcorder. Due to the mobility of mobile phones, the stand needs to have strong multi-angle rotation characteristics. Currently, most mobile shooting stands on the market are modified from bicycle, motorcycle or car mounts. Their rotation characteristics are mostly achieved by tightening and loosening screws by hand. This structure is relatively difficult to handle for road shooting with fast transitions.

[0003] To overcome the above-mentioned shortcomings, the prior art discloses a damped rotation positioning mobile phone holder, including a connecting frame, a mobile phone clamp, a pivot component, a damping component, and a damping auxiliary component. The connecting frame is provided with a mating part and a connecting part; the mobile phone clamp includes a clamping body and a transition part; the two ends of the pivot component are respectively connected to the connecting part and the transition part; the damping component includes a damping male component and a damping female component; the output end of the damping male component extends towards the damping female component and elastically abuts against the damping female component; one end of the damping auxiliary component is disposed on the connecting part, and the other end extends outward and abuts against the end face of the transition part. The pivot component connects the rotation of both sides and the pivot action; the damping component allows damped rotation between the connecting part and the transition part; and with the clamping of the damping auxiliary component, the damping between the transition part and the connecting part can be doubled, allowing the mobile phone clamp to be set at any angle, thereby satisfying the multi-angle rotation characteristics of mobile phone photography.

[0004] However, the aforementioned phone clamp only uses damping to suspend the phone. When the phone is heavy, the damping effect of the clamp is difficult to overcome the weight of the phone, and the clamp cannot be stable, making it inconvenient to take pictures. Utility Model Content

[0005] The purpose of this invention is to provide a rotating locking mobile phone holder to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a rotating locking phone holder, comprising a support frame, a phone clamp, a pivot, a locking assembly, and a rotating cap. The support frame has a connecting portion; the phone clamp includes a clamping body and a rotating portion, the rotating portion being located on one side of the clamping body; the pivot connects the rotating portion and the connecting portion, allowing the rotating portion to be rotatably connected to the connecting portion; the locking assembly includes an elastic snap-fit ​​and a limiting groove, the elastic snap-fit ​​being located on one of the connecting portion and the rotating portion, and the limiting groove being located on the other of the connecting portion and the rotating portion, the elastic snap-fit ​​being snap-fit ​​into the limiting groove; the rotating cap is fitted onto the pivot and rotatably connected to the pivot, the rotating cap having a pressing component, and after the rotating cap rotates, the pressing component abuts against the elastic snap-fit, causing the elastic snap-fit ​​to retract from the limiting groove.

[0007] Furthermore, the elastic snap-fit ​​member is disposed on the rotating part, the limiting groove is disposed on the connecting part, and the elastic snap-fit ​​member is adapted to the limiting groove.

[0008] Furthermore, the elastic snap-fit ​​component includes a spring and a snap-fit ​​ball, the rotating part is provided with a mounting groove, the spring is located in the mounting groove, and the spring abuts against the snap-fit ​​ball to make the snap-fit ​​ball embed into the limiting groove.

[0009] Furthermore, the pressing member is provided with a pressing boss, and a pressing inclined surface is provided on one side of the pressing boss. After the rotating cap rotates, the pressing inclined surface slides against the retaining bead until the pressing boss abuts against the retaining bead, causing the retaining bead to exit the limiting groove.

[0010] Furthermore, the rotating part is provided with a columnar boss, one side of the connecting part is provided with a groove, the columnar boss is embedded in the groove and rotatably connected to the groove, the other side of the connecting part is provided with a connecting post, and the rotating cap is installed on the connecting post.

[0011] Furthermore, the rotating shaft includes a connecting screw, and the columnar boss is provided with a threaded hole. The connecting screw passes through the rotating cap and the connecting post and is connected to the threaded hole.

[0012] Furthermore, the connecting column is provided with an annular groove on its periphery, and the bottom of the annular groove is provided with the limiting groove. The pressing member extends into the annular groove and can move above the limiting groove.

[0013] Furthermore, a first stop is provided in the annular groove, and a second stop is provided on the rotating cap, the second stop being able to abut against the first stop.

[0014] Furthermore, a damping pad is provided at the end of the connecting column, and the damping pad abuts against the rotating cap.

[0015] Furthermore, the rotating cap rotates between the locked position and the unlocked position. One of the connecting part and the rotating cap is provided with an elastic ball, and the other is provided with a first positioning hole and a second positioning hole. When the elastic ball abuts into the first positioning hole, the rotating cap rotates to the locked position; when the elastic ball abuts into the second positioning hole, the rotating cap rotates to the unlocked position.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. After the phone clip holds the phone and its position is adjusted, the elastic locking member engages into the limiting groove, keeping the rotating part and the connecting part relatively fixed. At this time, the phone clip is locked and cannot rotate, effectively ensuring the stability of the phone clip. When it is necessary to readjust the position of the phone clip, rotate the rotating cap, and the pressing part abuts against the elastic locking member, causing the elastic locking member to disengage from the limiting groove. At this time, the phone clip can be rotated. After rotating to the correct position, the elastic locking member engages again into the limiting groove, locking the position of the phone clip. The phone clip in this application can both adjust its position and lock it after adjustment, resulting in better stability and facilitating mobile phone shooting.

[0018] 2. The pressing part is provided with a pressing boss, and a pressing slope is provided on one side of the pressing boss. After the rotating cap is rotated, the pressing slope slides against the retaining ball, gradually pressing the retaining ball to move it until the pressing boss abuts against the retaining ball. At this time, the retaining ball is pressed out of the limiting groove, and the phone clamp can be rotated.

[0019] 3. The rotating cap rotates between the locked and unlocked positions. One of the connecting parts and the rotating cap is equipped with a spring-loaded ball, and the other has a first positioning hole and a second positioning hole. When the spring-loaded ball abuts into the first positioning hole, there is a tactile feedback indicating that the cap has rotated to the locked position. When the spring-loaded ball abuts into the second positioning hole, there is a tactile feedback indicating that the cap has rotated to the unlocked position. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A three-dimensional structural diagram of a rotating locking mobile phone holder provided for an embodiment of this utility model;

[0022] Figure 2A cross-sectional view of a rotating locking phone holder provided in an embodiment of the present utility model, wherein the phone clip is in an unlocked state;

[0023] Figure 3 A cross-sectional view of a rotating locking mobile phone holder provided in an embodiment of the present utility model, wherein the mobile phone clip is in a locked state;

[0024] Figure 4 An exploded view of a rotating locking mobile phone holder provided for an embodiment of this utility model, showing the specific structure of the extrusion component;

[0025] Figure 5 An exploded view of a rotating locking mobile phone holder provided for an embodiment of this utility model shows the specific structure of the rotating part.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Support frame; 11. Connecting part; 111. Elastic ball; 12. Groove; 13. Connecting column; 131. Damping pad; 14. Annular groove; 141. First stop block; 15. Quick-release seat; 2. Mobile phone clip; 21. Clamping body; 22. Rotating part; 221. Mounting groove; 222. Columnar boss; 223. Threaded hole; 23. Cold shoe interface; 3. Rotating shaft; 31. Connecting screw; 4. Locking assembly; 41. Elastic snap-fit ​​part; 411. Spring; 412. Snap ball; 42. Limiting groove; 5. Rotating cap; 51. Pressing part; 511. Extrusion boss; 512. Extrusion bevel; 52. Second stop block; 54. First positioning hole; 55. Second positioning hole. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Reference Figures 1 to 5 As an embodiment of this utility model, a rotating locking mobile phone holder includes a support frame 1, a mobile phone clip 2, a rotating shaft 3, a locking assembly 4, and a rotating cap 5. The support frame 1 is provided with a connecting part 11. The mobile phone clip 2 includes a clamping body 21 and a rotating part 22, with the rotating part 22 located on one side of the clamping body 21. The rotating shaft 3 connects the rotating part 22 and the connecting part 11, so that the rotating part 22 is rotatably connected to the connecting part 11. The locking assembly 4 includes an elastic snap-fit ​​member 41 and a limiting groove 42. The elastic snap-fit ​​member 41 is located on one of the connecting part 11 and the rotating part 22, and the limiting groove 42 is located on the other of the connecting part 11 and the rotating part 22. The elastic snap-fit ​​member 41 can snap into the limiting groove 42. The rotating cap 5 is sleeved on the rotating shaft 3 and rotatably connected to the rotating shaft 3. The rotating cap 5 is provided with a pressing member 51. After the rotating cap 5 rotates, the pressing member 51 abuts against the elastic snap-fit ​​member 41, causing the elastic snap-fit ​​member 41 to retract from the limiting groove 42.

[0033] After the phone clip 2 holds the phone and its position is adjusted, the elastic locking member 41 engages with the limiting groove 42, keeping the rotating part 22 and the connecting part 11 relatively fixed. At this time, the phone clip 2 is locked and cannot rotate, effectively ensuring the stability of the phone clip 2. When it is necessary to readjust the position of the phone clip 2, rotate the rotating cap 5, and the pressing member 51 abuts against the elastic locking member 41, causing the elastic locking member 41 to disengage from the limiting groove 42. At this time, the phone clip 2 can be rotated. After rotating to the correct position, the elastic locking member 41 engages with the limiting groove 42 again, thus locking the position of the phone clip 2. The phone clip 2 in this application can both be adjusted in position and locked after adjustment, resulting in better stability and facilitating mobile phone shooting.

[0034] Specifically, the elastic snap-fit ​​member 41 is provided on the rotating part 22, and the limiting groove 42 is provided on the connecting part 11. The elastic snap-fit ​​member 41 and the limiting groove 42 are adapted to each other. The elastic snap-fit ​​member 41 includes a spring 411 and a retaining ball 412. The rotating part 22 is provided with a mounting groove 221. The spring 411 is located in the mounting groove 221. Part of the retaining ball 412 is located in the mounting groove 221 and abuts against the spring 411. The other part can extend out of the mounting groove 221. The spring 411 abuts against the retaining ball 412 so that the retaining ball 412 is embedded in the limiting groove 42. The limiting groove 42 is an arc-shaped groove that is adapted to the protruding abutting part of the retaining ball 412. The limiting groove 42 or the pressing member 51 is provided with a limiting stop to limit the protruding part of the retaining ball 412 and prevent the retaining ball 412 from protruding too much and detaching from the mounting groove 221. To enhance the stability of the rotating part 22 and the connecting part 11 after locking, multiple sets of elastic snap-fit ​​parts 41 and limiting grooves 42 can be provided.

[0035] In other embodiments, the elastic snap fastener 41 may also be provided on the connecting part 11, and the limiting groove 42 may be provided on the connecting part 11, provided that the elastic snap fastener 41 and the limiting groove 42 are adapted to each other.

[0036] In other embodiments, the locking bead 412 can be replaced by a locking block, which can be strip-shaped, cylindrical, or other shapes, without specific limitations, as long as it meets the functional requirements. The locking bead 412 is used in the above embodiments because its arc-shaped structure facilitates the pressing member 51 to abut against and push the locking bead 412 to move.

[0037] Furthermore, the pressing member 51 is provided with a pressing boss 511, and a pressing slope 512 is provided on one side of the pressing boss 511. After the rotating cap 5 is rotated, the pressing slope 512 slides against the retaining bead 412 until the pressing boss 511 abuts against the retaining bead 412, causing the retaining bead 412 to exit the limiting groove 42.

[0038] Specifically, the rotating cap 5 is sleeved on the rotating shaft 3 and is rotatably connected to the rotating shaft 3 by the limiting effect of the rotating shaft 3. The pressing member 51 is provided on the side of the rotating cap 5 facing the connecting part 11. The pressing member 51 is provided with a pressing boss 511. A pressing slope 512 is provided on one side of the pressing boss 511. The pressing slope 512 is connected to the pressing boss 511 and the two are smoothly transitioned. After the rotating cap 5 rotates, the pressing bevel 512 gradually moves from the lower end to the upper end towards the retaining bead 412. After the pressing bevel 512 abuts against the retaining bead 412, as the rotating cap 5 continues to rotate, the pressing bevel 512 can push the retaining bead 412 to move, causing the retaining bead 412 to retract into the mounting groove 221 and gradually exit from the limiting groove 42 until the pressing boss 511 abuts against the retaining bead 412. At this time, the retaining bead 412 is completely out of the limiting groove 42, and the rotating part 22 is released from the locking effect with the connecting part 11. The user can then manually drive the phone clip 2 to rotate and adjust. If multiple sets of elastic retaining elements 41 and limiting grooves 42 are provided, multiple sets of pressing elements 51 also need to be provided accordingly.

[0039] Furthermore, the rotating part 22 is provided with a columnar boss 222, and one side of the connecting part 11 is provided with a groove 12. The columnar boss 222 is embedded in the groove 12 and rotatably connected to the groove 12. The other side of the connecting part 11 is provided with a connecting post 13, and the rotating cap 5 is installed on the connecting post 13.

[0040] Specifically, the rotating shaft 3 includes a connecting screw 31. A threaded hole 223 is located in the middle of a columnar boss 222. The connecting screw 31 passes through the rotating cap 5 and the connecting post 13 and connects to the threaded hole 223. The columnar boss 222 has a mounting groove 221 located on one side of the threaded hole 223. One side of the connecting part 11 has a groove 12 that mates with the columnar boss 222. The columnar boss 222 is embedded in and rotatably connected to the groove 12. The other side of the connecting part 11 has a connecting post 13. The rotating cap 5 has a through hole that matches the connecting post 13. When installing the rotating cap 5, the through hole of the rotating cap 5 is inserted into the connecting post 13. After the rotating cap 5 is installed, the connecting screw 31 is installed. The connecting post 13 also has a through hole to facilitate the insertion and installation of the connecting screw 31.

[0041] In this embodiment, an annular groove 14 is provided around the connecting column 13, and a limiting groove 42 is provided at the bottom of the annular groove 14. The limiting groove 42 is a through groove. After the rotating cap 5 is installed, the pressing member 51 is located in the annular groove 14. After rotating the rotating cap 5, the pressing member 51 can rotate to the top of the limiting groove 42 and press against the retaining bead 412, so that the retaining bead 412 is removed from the limiting groove 42.

[0042] In other embodiments, the annular groove 14 structure can be omitted. In this case, the outer periphery of the connecting column 13 is set with a planar structure and a limiting groove 42 is provided on the planar surface. In this case, the pressing member 51 is recessed within the rotating cap 5, that is, the pressing member 51 does not protrude from the end face of the rotating cap 5, which facilitates the installation of the rotating cap 5.

[0043] Furthermore, a damping pad 131 is provided at the end of the connecting post 13, and the damping pad 131 abuts against the rotating cap 5. In this embodiment, the damping pad 131 is made of rubber. By using the damping pad 131, there is a certain frictional damping between the rotating cap 5 and the connecting post 13 when the rotating cap 5 rotates, which can keep the overall structure compact and prevent wobbling. At the same time, the setting of the damping component means that the rotating cap 5 requires a certain external force to rotate, avoiding accidental rotation of the rotating cap 5.

[0044] Furthermore, a first stop 141 is provided in the annular groove 14, and a second stop 52 is provided on the rotating cap 5, the second stop 52 being able to abut against the first stop 141. The rotation angle of the rotating cap 5 is limited by the abutment and limiting of the first stop 141 and the second stop 52.

[0045] Specifically, a first stop 141 is fixed inside the annular groove 14. The first stop 141 is recessed within the annular groove 14 and does not protrude from it, thus avoiding interference with the installation of the rotating cap 5. A second stop 52 is provided on the side of the rotating cap 5 facing the annular groove 14. The second stop 52, the pressing inclined surface 512, and the pressing boss 511 are all located on the same circumference. By setting the first stop 141 and the second stop 52, the rotation of the rotating cap 5 between the locked and unlocked positions can be limited. In this embodiment, one of the connecting part 11 and the rotating cap 5 is provided with an elastic ball 111, and the other is provided with a first positioning hole 54 and a second positioning hole 55. The elastic ball 111 abuts against the first positioning hole 54, providing a tactile feedback indicating that the rotating cap 5 has been rotated to the locked position. The elastic ball 111 abuts against the second positioning hole 55, providing a tactile feedback indicating that the rotating cap 5 has been rotated to the unlocked position.

[0046] Furthermore, one end of the support frame 1 is provided with a quick-release plate 15, which is rotatably connected to the support frame 1. The quick-release plate 15 and the support frame 1 are rotatably connected via a damping shaft, the damping of which can be adjusted. The quick-release plate 15 is a universal quick-release plate size, which can be easily inserted and installed onto the quick-release plate 15 of the tripod. The end of the clamping body 21 is provided with a cold shoe interface 23, which facilitates the connection and installation of photography accessories such as fill lights or microphones. Depending on the actual usage requirements, cold shoe interfaces 23 can be provided at both ends of the clamping body 21, or one end can be selected to provide a cold shoe interface 23. The cold shoe interface 23 is a universal interface, compatible with most photography accessories on the market.

[0047] The rotation-locking phone holder in this embodiment is used as follows:

[0048] After the phone clip 2 holds the phone, its position is adjusted. Once the position is adjusted, the rotating cap 5 is rotated, causing the elastic locking member 41 to engage in the limiting groove 42, thus keeping the rotating part 22 and the connecting part 11 relatively fixed. At this time, the phone clip 2 is locked and cannot rotate, effectively ensuring the stability of the phone clip 2. When it is necessary to readjust the position of the phone clip 2, the rotating cap 5 is rotated, and the pressing member 51 abuts against the elastic locking member 41, causing the elastic locking member 41 to disengage from the limiting groove 42. At this time, the phone clip 2 can be rotated. After it is rotated to the correct position, the rotating cap 5 is rotated again, causing the elastic locking member 41 to engage in the limiting groove 42 again, thus locking the position of the phone clip 2. The phone clip 2 in this application can both adjust its position and lock it after adjustment, resulting in better stability and facilitating mobile phone shooting.

[0049] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rotating locking phone holder, characterized in that, include: A support frame (1) is provided with a connecting part (11); The mobile phone clamp (2) includes a clamping body (21) and a rotating part (22), wherein the rotating part (22) is disposed on one side of the clamping body (21); A rotating shaft (3) connects the rotating part (22) and the connecting part (11) so that the rotating part (22) is rotatably connected to the connecting part (11); The locking component (4) includes an elastic snap-fit ​​member (41) and a limiting groove (42). The elastic snap-fit ​​member (41) is disposed on one of the connecting part (11) and the rotating part (22), and the limiting groove (42) is disposed on the other of the connecting part (11) and the rotating part (22). The elastic snap-fit ​​member (41) can snap into the limiting groove (42). A rotating cap (5) is fitted onto the rotating shaft (3) and rotatably connected to the rotating shaft (3). The rotating cap (5) is provided with a pressing member (51). After the rotating cap (5) rotates, the pressing member (51) abuts against the elastic snap-fit ​​member (41) to make the elastic snap-fit ​​member (41) exit from the limiting groove (42).

2. The rotating locking phone holder as described in claim 1, characterized in that, The elastic snap-fit ​​member (41) is provided on the rotating part (22), and the limiting groove (42) is provided on the connecting part (11). The elastic snap-fit ​​member (41) and the limiting groove (42) are adapted to each other.

3. The rotating locking phone holder as described in claim 2, characterized in that, The elastic snap-fit ​​component (41) includes a spring (411) and a snap-fit ​​bead (412). The rotating part (22) is provided with a mounting groove (221). The spring (411) is located in the mounting groove (221). The spring (411) abuts against the snap-fit ​​bead (412) so that the snap-fit ​​bead (412) is embedded in the limiting groove (42).

4. The rotating locking phone holder as described in claim 3, characterized in that, The pressing member (51) is provided with a pressing boss (511), and a pressing inclined surface (512) is provided on one side of the pressing boss (511). After the rotating cap (5) rotates, the pressing inclined surface (512) slides against the retaining bead (412) until the pressing boss (511) abuts against the retaining bead (412) and the retaining bead (412) exits the limiting groove (42).

5. The rotating locking phone holder as described in claim 1, characterized in that, The rotating part (22) is provided with a columnar boss (222), and the connecting part (11) is provided with a groove (12) on one side. The columnar boss (222) is embedded in the groove (12) and rotatably connected to the groove (12). The connecting part (11) is provided with a connecting post (13) on the other side. The rotating cap (5) is installed on the connecting post (13).

6. The rotating locking phone holder as described in claim 5, characterized in that, The rotating shaft (3) includes a connecting screw (31), and the columnar boss (222) is provided with a threaded hole (223). The connecting screw (31) passes through the rotating cap (5) and the connecting post (13) and is connected to the threaded hole (223).

7. The rotating locking phone holder as described in claim 5, characterized in that, The connecting column (13) has an annular groove (14) around its periphery, and the bottom of the annular groove (14) has the limiting groove (42). The pressing member (51) extends into the annular groove (14) and can move above the limiting groove (42).

8. The rotating locking phone holder as described in claim 7, characterized in that, The annular groove (14) is provided with a first stop (141), and the rotating cap (5) is provided with a second stop (52), which can abut against the first stop (141).

9. The rotating locking phone holder as described in claim 5, characterized in that, The end of the connecting post (13) is provided with a damping pad (131), which abuts against the rotating cap (5).

10. The rotating locking phone holder as described in any one of claims 1 to 9, characterized in that, The rotating cap (5) rotates between the locked position and the unlocked position. One of the connecting part (11) and the rotating cap (5) is provided with an elastic ball (111), and the other is provided with a first positioning hole (54) and a second positioning hole (55). The elastic ball (111) abuts against the first positioning hole (54), and the rotating cap (5) rotates to the locked position. The elastic ball (111) abuts against the second positioning hole (55), and the rotating cap (5) rotates to the unlocked position.

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