Orthopedic rehabilitation auxiliary traction support with tightness adjusting function
By designing an orthopedic rehabilitation assisted traction bracket with elastic adjustment, the flexible adjustment of the support position is achieved using the connecting belt and locking mechanism, the problem of fixed support position and inconvenient operation in the prior art is solved, and the flexibility and functionality of the support position is achieved is achieved. It is suitable for the use of limbs of different sizes and can assist patients' limb activities and training.
Patent Information
- Application Number
- CN202510254439.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-05-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The support position of the existing orthopedic rehabilitation traction bracket is fixed, cannot be flexibly adjusted, is inconvenient to operate and may cause harm to the patient, and is unable to assist the patient's limb movement training, reducing the flexibility of the device.
A orthopedic rehabilitation auxiliary traction bracket with elastic adjustment is designed. Through the coordination of the connecting belt and the locking mechanism, flexible adjustment of the support position is achieved. Through the design of the movable connecting mechanism and the rotation shaft, the horizontal and vertical movement of the support plate is achieved to adapt to the different positions and movement needs of the patient's limbs.
It realizes flexible adjustment of support positions and adapts to the use of limbs of different sizes, increases the functionality and flexibility of the device, avoids discomfort and harm to the patient, and can assist the patient's limb activities and training.
Smart Images
Figure CN120037003A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of medical rehabilitation, and specifically relates to an orthopedic rehabilitation auxiliary traction bracket with tension adjustment. Background Art
[0002] In orthopedic medical treatment, patients sometimes need to have their limbs tractioned after treatment to keep their limbs in a certain state to assist in their recovery, or to assist in the activity training of the patient's limbs. The orthopedic rehabilitation auxiliary traction bracket can perform the traction of the patient's lower limbs.
[0003] Prior Art 1 (a Chinese patent with the application number CN201922069803.3 and published on August 14, 2020) is an orthopedic nursing traction bracket, which specifically relates to the technical field of medical auxiliary instruments. It includes a cross bar and a fixing hoop. Two bearings are embedded at the top of the cross bar. A threaded cylinder is sleeved in the bearing. A first threaded column is threadedly connected in the threaded cylinder. The bottom end of the first threaded column is fixedly connected to a bottom plate. Two through holes are opened at the top of the bottom plate. A second threaded column is arranged in the through hole. The top end of the second threaded column is fixedly connected to the fixing hoop. The bottom end of the second threaded column passes through the through hole and is threadedly connected to a first threaded cap. By setting a clamping seat, a fixing seat, a cross bar and a bottom plate, and by turning the threaded cylinder to adjust the angle of the first threaded column and the bottom plate upwards, the cross bar, the fixing seat, the bottom plate and the clamping seat are all movably clamped. Compared with the prior art, the disassembly and integration are more convenient, which is beneficial to sorting and placing, avoiding the overall structure affecting subsequent sorting and maintenance, and facilitating the work of the staff; Prior Art 2 (a Chinese patent with the application number CN201920095440.8 and published on December 31, 2019) is an orthopedic nursing traction bracket, including a base. Hydraulic cylinders are arranged at the center of the top edge of the base. A hydraulic rod is arranged at the top of the hydraulic cylinder. The end of the hydraulic rod away from the hydraulic cylinder is connected to a housing. The present invention relates to the technical field of orthopedic nursing. Through the cooperation of a handle, a threaded rod, a threaded sleeve, a connecting rod, a clamping plate, a fixing frame, a first spring, a sliding rod, a corrugated pipe and a sponge pad, the two clamping plates can clamp and fix different sizes of orthopedic joint parts, and at the same time can play a certain protective role in the orthopedic joint parts, thereby improving the quality of orthopedic nursing, with strong flexibility and convenient adjustment. Through the action of the hydraulic cylinder and the hydraulic rod, the height of the housing can be adjusted up and down, and then the height of the clamping mechanism can be adjusted until it is adjusted to a suitable height for the patient, increasing the comfort of the patient during the treatment process and strengthening the effect of traction treatment.
[0004] Although the current traction bracket can support the patient's leg, its support position is generally fixed, that is, the support position cannot be adjusted flexibly. If continuous adjustment is required, the position of the entire device needs to be changed. And the patient's limb is clamped by an ordinary clamping method, and the clamping component has to pass through the patient's limb first. When the component is large, the operation is more inconvenient, and it is also easy to cause harm to the patient when the patient's limb is moved over a large range. Moreover, the fixed traction bracket cannot assist the patient's limb movement training, reducing the flexibility of the device. Summary of the Invention
[0005] The purpose of the present invention is to provide an orthopedic rehabilitation auxiliary traction bracket with tension adjustment to solve the problems in the above-mentioned background technology, that is, the current technology generally has a fixed support position, that is, the support position cannot be adjusted flexibly. If continuous adjustment is required, the position of the entire device needs to be changed. And the patient's limb is clamped by an ordinary clamping method, and the clamping component has to pass through the patient's limb first. When the component is large, the operation is more inconvenient, and it is also easy to cause harm to the patient when the patient's limb is moved over a large range. Moreover, the fixed traction bracket cannot assist the patient's limb movement training.
[0006] To achieve the above purpose, the present invention provides the following technical solution: an orthopedic rehabilitation auxiliary traction bracket with tension adjustment, including a mounting seat connected to the bed body. A bed body connection mechanism is arranged on the side of the mounting seat to connect and fix the mounting seat and the bed body. And a support plate is arranged above the mounting seat, and a connection seat is arranged below the support plate. A connection belt is fixed to the lower left side of the connection seat, and an auxiliary block is fixed to the right side of the connection seat. The connection belt passes through the auxiliary block, and a locking mechanism is arranged on the outer side of the connection belt to fix the connection belt, forming an enclosure structure to provide support for the patient's limb. A rotating shaft is rotatably connected above the connection seat, and the upper end of the rotating shaft is connected to a driving plate. And an upward pulling control mechanism is arranged above the driving plate. The driving plate is connected to the support plate through the upward pulling control mechanism. An active connection mechanism is arranged at the left end of the support plate. The support plate is installed above the mounting seat through the active connection mechanism, and the support plate is horizontally moved and adjusted under the action of the active connection mechanism.
[0007] Further optimize the technical solution, the bed body connection mechanism includes a positioning plate, a clamping plate and a threaded rod; The positioning plate is fixed to the side of the mounting seat; The clamping plate is arranged below the positioning plate, and a vertical sliding structure is formed between the clamping plate and the mounting seat, and the surface of the clamping plate is made of rubber material; The threaded rod passes through the clamping plate and forms a threaded connection between the clamping plates, and the threaded rod is rotatably installed inside the mounting seat.
[0008] To further optimize this technical solution, a flexible bottom support is fixed to the lower surface of the connecting seat, and the surface of the flexible bottom support is designed in an arc shape. A silica gel cushion layer is arranged at the relative position between the connecting belt and the flexible bottom support.
[0009] To further optimize this technical solution, the locking mechanism includes a locking groove, a locking block, a first spring, and a control head; The locking groove is evenly opened on the outer surface of the connecting belt; The locking block is arranged inside the auxiliary block and forms a telescopic structure with the auxiliary block. The locking block is engaged with the locking groove, and the lower part of the locking block is designed in an arc shape; The first spring is fixed on the right side of the locking block to provide a left thrust for the locking block; The control head is fixed on the right side of the locking block to control the movement of the locking block.
[0010] To further optimize this technical solution, the upward pulling control mechanism includes an adjusting rod and a guiding rod; The adjusting rod is rotatably installed on the upper surface of the driving plate, and the upper end of the adjusting rod penetrates through the supporting plate and forms a threaded connection between the supporting plates; The guiding rod is fixed on the upper surface of the driving plate, and the guiding rod penetrates through the supporting plate and forms a nested connection between the supporting plates.
[0011] To further optimize this technical solution, the movable connection mechanism includes a movable head, a connecting groove, and a connecting shaft; The movable head is arranged above the mounting seat; The connecting groove is opened inside the movable head, and the supporting plate penetrates through the connecting groove and forms a sliding connection between the connecting grooves; The connecting shaft is fixed below the movable head, and the connecting shaft rotates in the mounting seat to adjust the direction of the movable head.
[0012] To further optimize this technical solution, balls are arranged inside the connecting groove to assist the sliding of the supporting plate, and a locking rod is arranged above the connecting groove. The locking rod penetrates through the upper surface of the movable head and forms a threaded connection with the movable head.
[0013] To further optimize this technical solution, a limiting mechanism is arranged below the connecting shaft to limit the rotation of the connecting shaft through the limiting mechanism so that it can maintain the stability of its own state.
[0014] To further optimize this technical solution, the limiting mechanism includes an expanding disk, a sliding plate, a second spring, a positioning block, and a positioning groove; The expanding disk is fixed below the connecting shaft, and the expanding disk is located inside the mounting seat and forms an up-and-down sliding structure with the mounting seat; The sliding plate is arranged below the expanding disk and is in contact with the expanding disk; The second spring is fixed below the sliding plate to provide an upward thrust for the sliding plate; The positioning block is fixed above the expansion disk; The positioning groove is opened inside the mounting seat, and the positioning grooves are equally angularly distributed with the center of the connecting shaft as the center, and a concave-convex fitting structure is formed between the positioning groove and the positioning block.
[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The connection between the device and the patient's limb is realized through the connection belt and the connection seat, and the connection belt is in a strip structure, which can be conveniently passed through under the patient's limb, and the installation and use are more convenient. At the same time, the connection belt can be fixed through the locking mechanism, and its locking length can be adjusted to adjust the enclosure tightness, so as to adapt to the use of different sizes of limbs and increase its functionality; (2) The connection belt is fixed through the connection of the locking block and the locking groove, and one end of the locking block is designed in an arc shape, so that the connection belt can be locked by one-way pulling, which is convenient for tightening control of the connection belt. When releasing it later, manually operate the control head to move; (3) The mounting seat can be fixedly installed on the side of the bed body through the clamping plate. Subsequently, by controlling the movement of the driving plate, the connection seat is driven to adjust the vertical position, and the limb is tractioned. Moreover, the traction height can be adjusted according to needs. After the limb is tractioned, the patient can perform lateral swing training of the limb, and the connection seat and the support plate can adaptively move and adjust; (4) Through the sliding of the support plate in the movable head and the rotation of the movable head, the connection seat can be automatically adjusted, so that the traction position can be flexibly adjusted. Moreover, the locking rod arranged in the movable head can lock the movement of the support plate, so that the support plate can maintain a stable position; (5) By rotating the connecting shaft, the support plate can be received on the side of the bed body, which is convenient for storage. At the same time, when the support plate does not receive a downward pulling force, the positioning block and the positioning groove are connected, which can limit the rotation of the connecting shaft and keep the support plate stable on the side. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional structure schematic diagram of the present invention; Figure 2 It is a three-dimensional structure schematic diagram of the new connection seat of the present utility model; Figure 3 It is a main sectional structure schematic diagram of the auxiliary block of the present invention; Figure 4 It is a side view structure schematic diagram of the mounting seat of the present invention; Figure 5 It is a top view structure schematic diagram of the present invention; Figure 6 It is a main sectional structure schematic diagram of the movable head of the present invention; Figure 7 Schematic cross-sectional structure diagram of the connection between the connecting shaft and the mounting seat of the present invention; Figure 8 Schematic bottom view structure diagram of the positioning groove of the present invention.
[0017] In the figure: 1, mounting seat; 2, positioning plate; 3, clamping plate; 4, threaded rod; 5, support plate; 6, connecting seat; 7, flexible bottom support; 8, connecting belt; 9, auxiliary block; 10, locking groove; 11, locking block; 12, first spring; 13, control head; 14, driving plate; 15, rotating shaft; 16, adjusting rod; 17, guiding rod; 18, movable head; 19, connecting groove; 20, ball; 21, locking rod; 22, connecting shaft; 23, enlarged disc; 24, sliding plate; 25, second spring; 26, positioning block; 27, positioning groove. Specific embodiments
[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0019] Please refer to Figures 1-8 , the present invention provides the following technical solutions: An orthopedic rehabilitation auxiliary traction bracket with tension adjustment, including a mounting seat 1 connected to the bed body; Embodiment 1: The invention provides a technical solution, which discloses that a bed body connection mechanism is arranged on the side of the mounting base 1 to connect and fix the mounting base 1 and the bed body. A support plate 5 is arranged above the mounting base 1, and a connection seat 6 is arranged below the support plate 5. A connection belt 8 is fixed below the left side of the connection seat 6, and an auxiliary block 9 is fixed on the right side of the connection seat 6. The connection belt 8 passes through the auxiliary block 9, and a locking mechanism is arranged on the outer side of the connection belt 8 to fix the connection belt 8, forming an enclosure structure to provide support for the patient's limb. A rotating shaft 15 is rotatably connected above the connection seat 6, and the upper end of the rotating shaft 15 is connected to a driving plate 14. An upward pulling control mechanism is arranged above the driving plate 14, and the driving plate 14 is connected to the support plate 5 through the upward pulling control mechanism. An active connection mechanism is arranged at the left end of the support plate 5, and the support plate 5 is installed above the mounting base 1 through the active connection mechanism. The support plate 5 is horizontally moved and adjusted under the action of the active connection mechanism. The bed body connection mechanism includes a positioning plate 2, a clamping plate 3, and a threaded rod 4. The positioning plate 2 is fixed on the side of the mounting base 1, the clamping plate 3 is arranged below the positioning plate 2, and a vertical sliding structure is formed between the clamping plate 3 and the mounting base 1. The surface of the clamping plate 3 is made of rubber material. The threaded rod 4 passes through the clamping plate 3 and is threadedly connected to the clamping plate 3, and the threaded rod 4 is rotatably installed inside the mounting base 1.
[0020] During use, the mounting base 1 can be connected to the bed body on which the patient lies. The positioning plate 2 is placed above the bed body, and then the threaded rod 4 is rotated to drive the clamping plate 3 to move. The clamping plate 3 cooperates with the positioning plate 2 to clamp the side of the bed body to complete the fixation of the mounting base 1. Then, the patient's limb can be enclosed below the connection seat 6 through the connection belt 8. Subsequently, by controlling the upward movement of the connection seat 6, the patient's limb can be pulled upward to achieve the traction effect. After traction, the patient's limb can swing horizontally, and the support plate 5 adaptively adjusts its position when the limb moves.
[0021] Embodiment 2: On the basis of Embodiment 1, it is disclosed that a flexible bottom support 7 is fixed on the lower surface of the connecting seat 6, and the surface of the flexible bottom support 7 is designed with an arc-shaped structure. A silica gel cushion layer is arranged at the relative positions of the connecting band 8 and the flexible bottom support 7. The locking mechanism includes a locking groove 10, a locking block 11, a first spring 12 and a control head 13. The locking groove 10 is uniformly opened on the outer surface of the connecting band 8. The locking block 11 is arranged inside the auxiliary block 9 and forms a telescopic structure with the auxiliary block 9, and the locking block 11 and the locking groove 10 are engaged with each other. Moreover, the lower part of the locking block 11 is designed with an arc-shaped structure. The first spring 12 is fixed on the right side of the locking block 11 to provide a left thrust for the locking block 11. The control head 13 is fixed on the right side of the locking block 11 to control the movement of the locking block 11. The upward pulling control mechanism includes an adjusting rod 16 and a guiding rod 17. The adjusting rod 16 is rotatably installed on the upper surface of the driving plate 14, and the upper end of the adjusting rod 16 penetrates through the support plate 5 and forms a threaded connection with the support plate 5. The guiding rod 17 is fixed on the upper surface of the driving plate 14, and the guiding rod 17 penetrates through the support plate 5 and forms a nested connection with the support plate 5.
[0022] The connecting band 8 is fixed by the connection between the locking block 11 and the locking groove 10. By adjusting the connection position of the locking block 11 and the locking groove 10, the enclosure tightness of the connecting band 8 can be adjusted. When it is necessary to release the enclosure later, the control head 13 can be directly pulled to drive the locking block 11 to move and release the connection between the locking block 11 and the locking groove 10. When pulling, the adjusting rod 16 can be rotated to control the movement of the driving plate 14 through the threaded connection with the support plate 5. The driving plate 14 drives the connecting seat 6 to move to adjust and control the pulling height.
[0023] Embodiment 3: On the basis of Embodiment 1, it is disclosed that the movable connection mechanism includes a movable head 18, a connection groove 19, and a connection shaft 22. The movable head 18 is arranged above the mounting base 1. The connection groove 19 is opened inside the movable head 18. The support plate 5 passes through the connection groove 19 to form a sliding connection therebetween. The connection shaft 22 is fixed below the movable head 18. The connection shaft 22 rotates inside the mounting base 1 to adjust the direction of the movable head 18. A ball 20 is arranged inside the connection groove 19 to assist the sliding of the support plate 5. And a locking rod 21 is arranged above the connection groove 19. The locking rod 21 passes through the upper surface of the movable head 18 to form a threaded connection with the movable head 18. A limiting mechanism is arranged below the connection shaft 22 to limit the rotation of the connection shaft 22 through the limiting mechanism, so that it can maintain the stability of its own state. The limiting mechanism includes an enlarged disk 23, a sliding plate 24, a second spring 25, a positioning block 26, and a positioning groove 27. The enlarged disk 23 is fixed below the connection shaft 22. The enlarged disk 23 forms an up-and-down sliding structure between the inside of the mounting base 1 and the mounting base 1. The sliding plate 24 is arranged below the enlarged disk 23 and is in contact with the enlarged disk 23. The second spring 25 is fixed below the sliding plate 24 to provide an upward thrust for the sliding plate 24. The positioning block 26 is fixed above the enlarged disk 23. The positioning groove 27 is opened inside the mounting base 1. And the positioning grooves 27 are equally angularly distributed with the center of the connection shaft 22 as the center of the circle. And a concave-convex matching structure is formed between the positioning groove 27 and the positioning block 26.
[0024] After the limb is pulled, the downward pulling force of the limb drives the connection shaft 22 to move downward, so that the positioning block 26 is disengaged from the connection with the positioning groove 27. At this time, the connection shaft 22 is in a rotatable state, and the patient can perform horizontal swing training of the limb. When swinging, the connection seat 6 will rotate below the driving plate 14 through the rotating shaft 15, and at the same time drive the support plate 5 to slide inside the connection groove 19, and drive the movable head 18 to rotate, so that the support plate 5 can adapt to the position change during the limb swing for adjustment, realizing the movement training of the patient's limb. And when the device does not need to be used subsequently, the movable head 18 can be pressed down to rotate the support plate 5 to the side of the bed body to realize the storage of the support plate 5. Then the movable head 18 is released, and the second spring 25 pushes the enlarged disk 23 to move upward to connect the positioning block 26 and the positioning groove 27 to limit its rotation.
[0025] The content not described in detail in this specification belongs to the prior art well known to those skilled in the art.
[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An orthopedic rehabilitation auxiliary traction support with adjustable tension, comprising a mounting seat (1) connected to a bed body; Features: A bed body connection mechanism is provided on the side of the mounting seat (1) to connect and fix the mounting seat (1) and the bed body, and a support plate (5) is provided above the mounting seat (1), and a connecting seat (6) is provided below the support plate (5), a connecting belt (8) is fixed below the left side of the connecting seat (6), and an auxiliary block (9) is fixed on the right side of the connecting seat (6), the connecting belt (8) passes through the auxiliary block (9), and a locking mechanism is provided on the outside of the connecting belt (8) to fix the connecting belt (8) to form an enclosure structure for the patient The limb is supported, the connection seat (6) is rotatably connected with a rotating shaft (15) above, and the upper end of the rotating shaft (15) is connected with a driving plate (14), and a pull-up control mechanism is arranged above the driving plate (14), the driving plate (14) is connected to the support plate (5) through the pull-up control mechanism, and the left end of the support plate (5) is provided with a movable connection mechanism, the support plate (5) is installed above the mounting seat (1) through the movable connection mechanism, and the support plate (5) is moved and adjusted in the horizontal direction under the action of the movable connection mechanism.
2. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 1, characterized in that: The bed connecting mechanism comprises a positioning plate (2), a clamping plate (3) and a threaded rod (4); A positioning plate (2) fixed to a side of the mounting seat (1); The clamping plate (3) is arranged below the positioning plate (2), and an up-and-down sliding structure is formed between the clamping plate (3) and the mounting seat (1), and the surface of the clamping plate (3) is made of rubber material; The threaded rod (4) passes through the clamping plate (3) and forms a threaded connection between the clamping plates (3), and the threaded rod (4) is rotatably mounted inside the mounting seat (1).
3. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 1, characterized in that: A flexible base (7) is fixed to the lower surface of the connecting seat (6), and the surface of the flexible base (7) is designed to be an arc-shaped structure. A silicone cushion layer is provided at the relative position between the connecting belt (8) and the flexible base (7).
4. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 1 or 2, characterized in that: The locking mechanism comprises a locking groove (10), a locking block (11), a first spring (12) and a control head (13); Locking grooves (10) are evenly arranged on the outer surface of the connecting belt (8); A locking block (11) is arranged inside the auxiliary block (9) and between the auxiliary blocks (9) to form a telescopic structure, and the locking block (11) and the locking groove (10) are engaged with each other, and the lower part of the locking block (11) is designed to be an arc-shaped structure; A first spring (12) is fixed to the right side of the locking block (11) to provide a left thrust for the locking block (11); The control head (13) is fixed on the right side of the locking block (11) to control the movement of the locking block (11).
5. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 1, characterized in that: The pull-up control mechanism comprises an adjustment rod (16) and a guide rod (17); An adjusting rod (16) is rotatably mounted on the upper surface of the driving plate (14), and the upper end of the adjusting rod (16) penetrates through the support plate (5) and forms a threaded connection between the support plates (5); The guide rod (17) is fixed on the upper surface of the driving plate (14), and the guide rod (17) penetrates the support plate (5) and forms a nested connection between the support plates (5).
6. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 1, characterized in that: The movable connection mechanism comprises a movable head (18), a connection groove (19) and a connection shaft (22); A movable head (18) is arranged above the mounting seat (1); A connecting groove (19) is provided inside the movable head (18), and the support plate (5) passes through the connecting groove (19) to form a sliding connection between the connecting grooves (19); The connecting shaft (22) is fixed below the movable head (18), and the connecting shaft (22) is rotated in the mounting seat (1) to adjust the direction of the movable head (18).
7. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 6, characterized in that: A ball (20) is arranged inside the connection groove (19) to assist the sliding of the support plate (5), and a locking rod (21) is arranged above the connection groove (19). The locking rod (21) penetrates the upper surface of the movable head (18) and forms a threaded connection with the movable head (18).
8. An orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 6 or 7, characterized in that: A limiting mechanism is provided below the connecting shaft (22), and the limiting mechanism is used to limit the rotation of the connecting shaft (22) so that the connecting shaft (22) can maintain its own stable state.
9. The orthopedic rehabilitation auxiliary traction support with tension adjustment according to claim 8, characterized in that: The limiting mechanism comprises an enlarged disk (23), a slide plate (24), a second spring (25), a positioning block (26) and a positioning groove (27); An enlarged disk (23) is fixed below the connecting shaft (22), and the enlarged disk (23) is located inside the mounting seat (1) and between the mounting seat (1) to form an up-and-down sliding structure; A slide plate (24) is arranged below the enlarged plate (23) and is in contact with the enlarged plate (23); A second spring (25) is fixed below the slide plate (24) to provide an upward thrust for the slide plate (24); A positioning block (26) is fixed above the enlarged plate (23); The positioning grooves (27) are arranged inside the mounting seat (1), and the positioning grooves (27) are distributed at equal angles with the center of the connecting shaft (22) as the center of the circle, and a concave-convex matching structure is formed between the positioning grooves (27) and the positioning block (26).