A wallboard hanger dismounting device

Abstract

The application relates to the technical field of dismounting devices, and relates to a wallboard hanging piece dismounting device which comprises a driving piece, a movable piece and a locking piece, a driving piece is arranged in a holding part; the movable piece is inserted into the holding part and comprises a movable ring plate and a movable rod, one end of the movable rod is connected to the holding part, the other end of the movable rod is detachably connected to the movable rod; the locking piece is arranged on the holding part and comprises a locking block, a locking rod and an adjusting disc, one end of the locking rod is inserted into the movable rod, the other end of the locking rod is connected to the adjusting disc, one end of the adjusting disc is connected with a vortex-shaped strip, the locking block is slidingly connected to the movable ring plate, and a plurality of arc-shaped limiting grooves for the vortex-shaped strip to extend into are arranged on one side of the locking block; a plurality of locking blocks are arranged, the plurality of locking blocks are arranged around the movable ring plate, and the other sides of the locking blocks are all connected with limiting plates; the plurality of limiting plates and the movable ring plate are combined to form a clamping space; the driving piece is connected with the locking rod and used for driving the locking rod to rotate, and the application has the effect that fasteners can be conveniently dismounted and mounted.

Description

Technical Field

[0001] This application relates to the field of disassembly and assembly devices, and in particular to a wall panel mounting and disassembly device. Background Technology

[0002] With the diversification of modern home decoration, wall panel accessories, as an important part of interior decoration, are widely used in wall decoration, storage, and display. However, accessories are installed on wall panels using fasteners (mainly nuts and bolts). Disassembly and assembly require a disassembly / assembly device with a matching groove at the end. The fastener is inserted into the groove, and then the device is turned. However, for wall panel accessories of different sizes, fasteners of corresponding sizes are usually selected for disassembly and assembly. This necessitates using different sizes of disassembly / assembly devices, resulting in low efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a wall panel fastener disassembly and assembly device that can disassemble and assemble fasteners of different specifications, making the operation more convenient.

[0004] Firstly, the wall panel mounting and dismounting device provided in this application adopts the following technical solution: A wall panel mounting and dismounting device, comprising: The grip section contains a drive mechanism; The movable component, which is inserted into the gripping part, includes a movable ring plate and a hollow movable rod. One end of the movable rod is connected to the gripping part, and the other end of the movable rod is detachably connected to the movable rod. A locking component, disposed on the grip portion, includes a locking block, a locking rod, and an adjusting plate. One end of the locking rod is inserted into the movable rod, and the other end of the locking rod is connected to the adjusting plate. A spiral bar is connected to one end of the adjusting plate away from the locking rod. The locking block is slidably connected to the movable ring plate, and one side is provided with multiple arc-shaped limiting grooves for the spiral bar to extend into. Multiple locking blocks are provided, which surround the movable ring plate and are connected to limit plates on their other sides. The multiple limit plates and the movable ring plate surround each other to form a clamping space. The driving member is connected to the locking rod and is used to drive the locking rod to rotate so as to adjust the size of the clamping space.

[0005] By adopting the above technical solution, when disassembling fasteners such as nuts and bolts, the driving component drives the locking rod to move, and the adjusting plate on the locking rod rotates. It is limited by the vortex strip on the adjusting plate. At this time, the locking block moves toward or away from the center of the movable ring plate, so that the clamping space enclosed between the limiting plate and the movable ring plate contracts or expands to match fasteners of different specifications, making it easier to install or remove fasteners.

[0006] Optionally, anti-slip pads are installed on the side of the limiting plate closest to the center of the movable ring plate.

[0007] By adopting the above technical solution and setting anti-slip plates, when the fasteners are in close contact with the anti-slip plates, the constraint effect of the limiting plate on the fasteners can be enhanced, ensuring the stability of disassembly and assembly work.

[0008] Optionally, the anti-slip plate has an installation groove, and a pressure detector is installed in the installation groove. The pressure detector is connected to the driving component and is used to control the opening and closing of the driving component.

[0009] By adopting the above technical solution, the pressure detector installed in the mounting slot can detect the pressure on the limiting plate. When the pressure on the limiting plate reaches a predetermined value, it indicates that the limiting plate has clamped the fastener well. The pressure detector sends a signal to the driving component, causing the driving component to stop rotating.

[0010] Optionally, the locking lever is retractable and includes a first connecting rod and a second connecting rod. The second connecting rod is connected to the adjusting disc, one end of the first connecting rod is connected to the driving component, and the other end of the first connecting rod is inserted into the second connecting rod. A first elastic element is provided between the first connecting rod and the second connecting rod. The first elastic element is connected to the first connecting rod and the second connecting rod respectively. An avoidance groove is provided on the first connecting rod or the second connecting rod, and a retaining plate is elastically connected in the avoidance groove. The inner wall of the movable rod is provided with a slot, and one end of the locking plate protrudes. When the locking rod retracts, the locking plate extends into the slot, so that the locking rod engages with the movable rod.

[0011] By adopting the above technical solution, when the limiting plate clamps the fastener, the locking rod retracts and the locking plate on the locking rod extends into the slot, so that the locking rod and the movable rod are locked together. At this time, when the driving component drives the locking rod to rotate, the movable rod and the locking rod rotate synchronously. That is, the limiting plate no longer wants to move closer to or away from the center of the movable ring plate, thereby turning the fastener and disassembling the fastener.

[0012] Optionally, the clearance groove is formed on the second connecting rod, and the driving component is a telescopic shaft motor.

[0013] By adopting the above technical solution, after the limiting plate clamps the fastener, the telescopic shaft of the drive motor is pushed out, and the telescopic shaft presses the second connecting rod, causing the second connecting rod to move towards the movable ring plate. At this time, the clamping plate on the second connecting rod extends into the clamping groove, and the fastening rod and the movable rod are engaged.

[0014] Optionally, the inner wall of the movable rod and the locking plate are fitted with a clearance, and an annular locking portion extends from the inner wall of the movable rod. The locking groove is formed on the locking portion and penetrates the peripheral side wall of the movable rod.

[0015] By adopting the above technical solution, when the locking rod is not engaged with the moving rod, the locking rod will not cause the locking plate to scrape against the inner wall of the moving rod when it rotates, thus providing better protection for the moving rod.

[0016] Optionally, multiple slots and multiple card plates are provided, with multiple card plates arranged around the first connecting rod and corresponding one-to-one with multiple slots.

[0017] By adopting the above technical solution and setting multiple slots and plates, the locking effect between the locking rod and the moving rod is enhanced.

[0018] Optionally, the snap-fit ​​portion is smoothly connected to the inner wall of the movable rod.

[0019] By adopting the above technical solution, when the card plate passes through the smooth connection between the movable rod and the locking part, the card plate gradually retracts towards the axis of the locking rod, ensuring that the card plate smoothly enters the slot.

[0020] Optionally, both sides of the locking block extend with limiting protrusions, and the movable ring plate is provided with a constraint groove that matches the limiting protrusions.

[0021] By adopting the above technical solution, the setting of the limiting protrusion can effectively limit the locking block and prevent the possibility of the movement trajectory of the locking block deviating when it is driven by the locking rod to move towards the center of the movable ring plate.

[0022] Optionally, the movable ring plate is provided with a plurality of limiting rods, which are arranged around the movable ring plate and inserted into the movable rod. A second elastic element is sleeved on the limiting rod, one end of the second elastic element abuts against the movable ring plate, and the other end of the second elastic element abuts against the movable rod.

[0023] By adopting the above technical solution, when disassembling the fastener, it is necessary to loosen the fastener. The fastener continues to move towards the movable ring plate, pressing the movable ring plate and causing it to retract. Therefore, personnel do not need to move the disassembly / removal device along with the fastener after grasping the grip, thus avoiding the need for the disassembly / removal device to retract. In summary, this application includes at least one of the following beneficial technical effects: 1. This application includes fasteners. When fasteners such as nuts and bolts are disassembled, the driving component drives the locking rod to move. The adjusting plate on the locking rod rotates and is limited by the vortex strip on the adjusting plate. At this time, the locking block moves toward or away from the center of the movable ring plate, so that the clamping space enclosed between the limiting plate and the movable ring plate contracts or expands to match fasteners of different specifications, making it easier to install or remove the fasteners. 2. The pressure detector installed in the mounting slot can detect the pressure on the limit plate. When the pressure on the limit plate reaches the predetermined value, it means that the limit plate has clamped the fastener well. The pressure detector sends a signal to the drive component to stop the drive component from rotating. 3. The locking rod in this application is telescopic. When the limiting plate clamps the fastener, the locking rod retracts and the locking plate on the locking rod extends into the slot, so that the locking rod and the movable rod are locked together. At this time, when the driving component drives the locking rod to rotate, the movable rod and the locking rod rotate synchronously. That is, the limiting plate no longer wants to move closer to or away from the center of the movable ring plate, thereby turning the fastener and disassembling the fastener. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the wall panel mounting and disassembly device in this application; Figure 2 This is a partial structural schematic diagram of the wall panel mounting and disassembly device in this application; Figure 3 This is a cross-sectional structural schematic diagram of the wall panel mounting and disassembly device in this application; Figure 4 This is a three-dimensional structural diagram of the gripping part and the ring plate in this application.

[0025] In the diagram, 1. Grip; 11. Limiting plate; 2. Movable part; 21. Movable ring plate; 211. Constraint groove; 22. Movable rod; 221. Slide groove; 23. Slot; 24. Snap-fit ​​part; 25. Limiting rod; 26. Second elastic element; 27. Ring plate; 3. Locking part; 31. Locking block; 311. Limiting groove; 32. Locking rod; 321. First connecting rod; 3211. Limiting hole; 322. Second connecting rod; 33. Adjusting plate; 34. Vortex strip; 35. Limiting plate; 36. First elastic element; 37. Clearance groove; 38. Snap plate; 4. Driving part; 5. Clamping space; 6. Anti-slip plate; 61. Mounting groove; 7. Limiting protrusion; 8. Pressure detector; 9. Third elastic element; 10. Protrusion. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0027] A wall panel mounting and dismounting device, referring to Figure 1 and Figure 2 It includes a gripping part 1, a movable part 2 and a locking part 3. The movable part 2 and the locking part 3 are coaxially arranged and are both installed on the gripping part 1. A driving part 4 is provided inside the gripping part 1 for driving the locking part 3 to rotate.

[0028] Combination Figure 3 and Figure 4 The movable component 2 includes a movable ring plate 21 and a hollow movable rod 22. One end of the movable rod 22 is connected to the grip part 1, and the other end of the movable rod 22 is detachably connected to the movable rod 22. Further, the locking component 3 includes a locking block 31, a locking rod 32 and an adjusting plate 33. One end of the locking rod 32 is inserted into the movable rod 22, and the other end of the locking rod 32 is connected to the adjusting plate 33. A spiral bar 34 is connected to the end of the adjusting plate 33 away from the locking rod 32. The locking block 31 is slidably connected to the movable ring plate 21, and one side is provided with multiple limiting grooves 311 for the spiral bar 34 to extend into. Furthermore, multiple locking blocks 31 are provided. In this embodiment, there are 6 locking blocks 31, which correspond one-to-one with the six sides of fasteners such as nuts and bolts. The 6 locking blocks 31 are arranged around the movable ring plate 21, and the other side of each locking block 31 is connected to a limiting plate 35. The multiple limiting plates 35 and the movable ring plate 21 surround each other to form a clamping space 5. The driving member 4 is connected to the locking rod 32 and is used to drive the locking rod 32 to rotate so as to adjust the size of the clamping space 5.

[0029] When disassembling fasteners such as nuts and bolts, the driving component 4 drives the locking rod 32 to move, and the adjusting plate 33 on the locking rod 32 rotates. It is limited by the spiral bar 34 on the adjusting plate 33. At this time, the locking block 31 moves toward or away from the center of the movable ring plate 21, so that the clamping space 5 enclosed between the limiting plate 35 and the movable ring plate 21 contracts or expands until the inner side wall of the limiting plate 35 abuts against the fastener. At this time, the position of the limiting plate 35 is adjusted. By rotating the gripping part 1, the fastener can be disassembled or assembled.

[0030] Furthermore, referring to Figure 3 The locking rod 32 is retractable and includes a first connecting rod and a second connecting rod 322. The second connecting rod 322 is connected to the adjusting plate 33, while one end of the first connecting rod 321 is connected to the driving member 4, and the other end of the first connecting rod 321 is inserted into the second connecting rod 322. Specifically, in this embodiment, both ends of the first connecting rod 321 are provided with hexagonal limiting holes 3211, and the cross-section of the output shaft of the driving member 4 and the end of the second connecting rod 322 that is inserted into the first connecting rod 321 are both hexagonal.

[0031] Furthermore, a first elastic element 36 is provided between the first connecting rod 321 and the second connecting rod 322. In this embodiment, the first elastic element 36 is a spring. One end of the spring abuts against the first connecting rod 321, and the other end of the spring abuts against the second connecting rod 322. When the first connecting rod 321 or the second connecting rod 322 is pressed, the locking rod 32 retracts.

[0032] Reference Figure 3 An avoidance groove 37 is provided on the first connecting rod 321 or the second connecting rod 322. In this embodiment, the avoidance groove 37 is provided on the second connecting rod 322. The avoidance groove 37 is provided along the length direction of the second connecting rod 322 and a retaining plate 38 is provided inside. One end of the retaining plate 38 is connected to the wall of the avoidance groove 37, and the other end of the retaining plate 38 protrudes out.

[0033] Correspondingly, the movable rod 22 is provided with a slot 23. When the position of the limiting plate 35 is adjusted, the second connecting rod 322 is pushed and moves toward the first connecting rod 321, which will drive the locking plate 38 to move synchronously. The protruding end of the locking plate 38 will extend into the slot 23, so that the locking rod 32 and the movable rod 22 are locked together. At this time, when the driving component 4 drives the locking rod 32 to rotate, it will drive the movable rod 22 to rotate synchronously.

[0034] It should be noted that in this embodiment, the movable rod 22 is inserted into one side of the gripping part 1 and slidably connected to two ring plates 27 (the end of the movable rod 22 is provided with a groove 221, and a third elastic element 9, such as an elastic block or spring, is provided in the groove 221). The two ring plates 27 are arranged opposite to each other, and the gripping part 1 is provided with an insertion hole for the movable rod 22 to be inserted. A limiting piece 11 is provided in the insertion hole. There are two limiting pieces 11, both of which are inserted into the gap between the two ring plates 27 to lock the movable rod 22 and prevent the movable rod 22 from rotating when it is not engaged with the locking rod 32, thus interfering with the position conditions of the limiting plate 35.

[0035] Correspondingly, the drive component 4 adopts a telescopic shaft motor. The output shaft of the telescopic shaft motor is provided with a protrusion 10. When the output shaft extends, it will push the ring plate 27, causing the ring plate 27 to retract into the slide groove 221. At this time, the limit piece 11 releases the lock on the movable rod 22, and the movable rod 22 can rotate.

[0036] In addition, in other embodiments, the clearance groove 37 can also be formed on the first connecting rod 321 to achieve the same effect. Correspondingly, in this case, the first connecting rod 321 needs to be pushed toward the second connecting rod 322 (i.e., pressed from the adjusting plate 33). It should be noted that in this case, the width of the spiral bar 34 needs to be greater than the shortened length of the locking rod 32 to ensure that when the first connecting rod 321 is pressed, the spiral bar 34 does not disengage from the arc-shaped limiting groove 311. A pushing member (e.g., a stud, which extends into the gripping part 1 after rotation and pushes the ring plate 27) is provided on the gripping part 1 to push the ring plate 27 back into the sliding groove 221.

[0037] Reference Figure 3 In order to enhance the locking effect between the locking rod 32 and the movable rod 22 and ensure that the movable rod 22 can rotate synchronously with the locking rod 32, multiple slots 23 and multiple plates 38 are provided. Multiple plates 38 are arranged around the first connecting rod 321 and are arranged in correspondence with multiple slots 23.

[0038] Furthermore, referring to Figure 3 The inner wall of the movable rod 22 is fitted with the locking plate 38 with a clearance, thereby preventing the locking plate 38 on the locking rod 32 from rubbing against the inner wall of the movable rod 22 when the position of the limiting plate 35 is adjusted. A ring-shaped locking part 24 extends from the inner wall of the movable rod 22, and a slot 23 is opened on the locking part 24 and penetrates the peripheral side wall of the movable rod 22.

[0039] In addition, the locking part 24 is smoothly connected to the inner wall of the movable rod 22. When the locking plate 38 passes through the smooth connection between the movable rod 22 and the locking part 24, the locking plate 38 gradually retracts towards the axis of the locking rod 32 to ensure that the locking plate 38 smoothly enters the locking groove 23.

[0040] Reference Figure 1 and Figure 2 Multiple limiting plates 35 are equipped with anti-slip plates 6 on the side near the center of the movable ring plate 21. The side of the anti-slip plate 6 away from the limiting plate 35 is provided with anti-slip texture to enhance the friction between the limiting plate 35 and the peripheral wall of the fastener.

[0041] Furthermore, the anti-slip plate 6 has an installation groove 61, and a pressure detector 8 is installed in the installation groove 61. The pressure detector 8 is connected to the drive component 4. The pressure detector 8 can detect the pressure on the limiting plate 35. When the pressure on the limiting plate 35 reaches a predetermined value, it means that the limiting plate 35 has clamped the fastener well. The pressure detector 8 sends a signal to the drive component 4 to stop the drive component 4 from rotating.

[0042] It should be noted that the grip 1 is provided with two control buttons (not shown in the figure). The control buttons are connected to the drive member 4 and can make the drive member 4 rotate again. When the control button is not pressed, the drive member 4 remains static. When one of the control buttons is pressed, the output shaft of the drive member 4 rotates forward. When the other control button is pressed, the output shaft of the drive member 4 rotates in reverse. The grip 1 is also provided with a power source (not shown in the figure) connected to the drive member 4 to provide power for the movement of the drive member 4.

[0043] Reference Figure 1 and Figure 2 Both sides of the locking block 31 extend with limiting protrusions 7. The movable ring plate 21 is provided with a constraint groove 211 that matches the limiting protrusions 7. When the locking block 31 moves toward or away from the center of the movable ring plate 21, the constraint groove 211 constrains the limiting protrusions 7 to ensure that the locking block 31 slides smoothly.

[0044] In addition, multiple limiting rods 25 are provided on the movable ring plate 21. The multiple limiting rods 25 are arranged around the movable ring plate 21 and are inserted into the movable rod 22. A second elastic element 26 is sleeved on the limiting rod 25. One end of the second elastic element 26 abuts against the movable ring plate 21, and the other end of the second elastic element 26 abuts against the movable rod 22. When the fastener is disassembled, the fastener needs to be loosened. The fastener continues to move toward the movable ring plate 21. The fastener will press the movable ring plate 21, causing the movable ring plate 21 to move backward. The relevant personnel do not need to move the disassembly and assembly device with the movement of the fastener after holding the grip part 1, so that the disassembly and assembly device can move backward.

[0045] The implementation principle of this application embodiment is as follows: when disassembling fasteners such as nuts and bolts, the driving component 4 drives the locking rod 32 to move, the adjusting plate 33 on the locking rod 32 rotates, and is limited by the vortex strip 34 on the adjusting plate 33. At this time, the locking block 31 moves toward or away from the center of the movable ring plate 21, so that the clamping space 5 enclosed between the limiting plate 35 and the movable ring plate 21 contracts or expands to match fasteners of different specifications. After the position of the limiting plate 35 is adjusted, the output shaft of the drive component 4 extends and pushes the second connecting rod 322 toward the first connecting rod 321, causing the clamping plate 38 to extend into the clamping slot 23, so that the locking rod 32 and the movable rod 22 are engaged. At this time, the drive component 4 is started again, and the movable rod 22 and the locking rod 32 rotate synchronously, which can tighten or loosen the fasteners, making it more convenient to install and remove fasteners.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wall panel mounting and dismounting device, characterized in that, include: The gripping part (1) is equipped with a driving component (4); The movable part (2) is inserted into the gripping part (1) and includes a movable ring plate (21) and a hollow movable rod (22). One end of the movable rod (22) is connected to the gripping part (1), and the other end of the movable rod (22) is detachably connected to the movable ring plate (21). The locking component (3) is provided on the movable component (2) and includes a locking block (31), a locking rod (32) and an adjusting plate (33). One end of the locking rod (32) is inserted into the movable rod (22), and the other end of the locking rod (32) is connected to the adjusting plate (33). A spiral bar (34) is connected to the end of the adjusting plate (33) away from the locking rod (32). The locking block (31) is slidably connected to the movable ring plate (21), and the locking block (31) has multiple arc-shaped limiting grooves (311) on the side near the spiral bar (34) for the spiral bar (34) to extend into. Multiple locking blocks (31) are provided, and multiple locking blocks (31) are arranged around the movable ring plate (21). Each of the multiple locking blocks (31) is connected to a limiting plate (35) on the side facing away from the spiral strip (34). The multiple limiting plates (35) and the movable ring plate (21) surround each other to form a clamping space (5). The driving member (4) is connected to the locking rod (32) and is used to drive the locking rod (32) to rotate so as to adjust the size of the clamping space (5). The locking rod (32) is retractable and includes a first connecting rod (321) and a second connecting rod (322). The second connecting rod (322) is connected to the adjusting plate (33). One end of the first connecting rod (321) is connected to the driving member (4), and the other end of the first connecting rod (321) is inserted into the second connecting rod (322). A first elastic element (36) is provided between the first connecting rod (321) and the second connecting rod (322). The first elastic element (36) is connected to the first connecting rod (321) and the second connecting rod (322) respectively. A clearance groove (37) is provided on the first connecting rod (321) or the second connecting rod (322). A retaining plate (38) is elastically connected in the clearance groove (37). The inner wall of the movable rod (22) is provided with a slot (23), and one end of the locking plate (38) protrudes out. When the locking rod (32) retracts, the locking plate (38) extends into the slot (23) so that the locking rod (32) engages with the movable rod (22). The end of the movable rod (22) is provided with a groove (221), and a third elastic element (9) is provided in the groove (221). The movable rod (22) is inserted into one side of the grip (1) and slidably connected to two ring plates (27). The ring plates (27) are provided in the groove (221) and the two ring plates (27) are arranged opposite to each other. The grip (1) is provided with an insertion hole for the movable rod (22) to be inserted. A limiting piece (11) is provided in the insertion hole. There are two limiting pieces (11). Both limiting pieces (11) are inserted into the gap between the two ring plates (27) to lock the movable rod (22) and prevent the movable rod (22) from rotating when it is not engaged with the locking rod (32). The drive component (4) is a telescopic shaft motor. The output shaft of the telescopic shaft motor is provided with a protrusion (10). When the output shaft is extended, it will push the ring plate (27) and cause the ring plate (27) to retract into the slide groove (221). At this time, the limiting piece (11) releases the lock on the movable rod (22), and the movable rod (22) can rotate.

2. The wall panel mounting and dismounting device according to claim 1, characterized in that, The limiting plate (35) has an anti-slip plate (6) installed on the side near the center of the movable ring plate (21).

3. The wall panel mounting and dismounting device according to claim 2, characterized in that, The anti-slip plate (6) has an installation groove (61) and a pressure detector (8) is provided in the installation groove (61). The pressure detector (8) is connected to the drive component (4) and is used to control the opening and closing of the drive component (4).

4. A wall panel mounting and dismounting device according to claim 1, characterized in that, The inner wall of the movable rod (22) is fitted with the card plate (38) with a clearance. An annular snap-fit ​​portion (24) extends from the inner wall of the movable rod (22). The card groove (23) is opened on the snap-fit ​​portion (24) and penetrates the peripheral side wall of the movable rod (22).

5. A wall panel mounting and dismounting device according to claim 4, characterized in that, Multiple slots (23) and multiple card plates (38) are provided. Multiple card plates (38) are arranged around the first connecting rod (321) and are arranged one-to-one with multiple slots (23).

6. A wall panel mounting and dismounting device according to claim 4, characterized in that, The snap-fit ​​part (24) is smoothly connected to the inner wall of the movable rod (22).

7. A wall panel mounting and dismounting device according to claim 1, characterized in that, Both sides of the locking block (31) extend with limiting protrusions (7), and the movable ring plate (21) is provided with a constraint groove (211) that matches the limiting protrusions (7).

8. A wall panel mounting and dismounting device according to claim 6, characterized in that, The movable ring plate (21) is provided with a plurality of limiting rods (25), which are arranged around the movable ring plate (21) and are inserted into the movable rod (22). A second elastic element (26) is sleeved on the limiting rod (25), one end of the second elastic element (26) abuts against the movable ring plate (21), and the other end of the second elastic element (26) abuts against the movable rod (22).

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