Seat backrest sleeving tool

Abstract

The utility model discloses a seat backrest sleeving tool which comprises a base, a clamping device and a clamping device. The fixing assembly is used for fixing the seat backrest, and the fixing assembly is rotationally arranged on the base; and the locking assembly is arranged on the base and located on one side of the fixing assembly, and the locking assembly is used for fixing the fixing assembly in the radial direction. The fixing assembly is rotationally installed on the base, a seat backrest framework set can be conveniently rotated, a worker does not need to move around the seat backrest framework in the operation process, all faces of the seat backrest set can be conveniently subjected to set operation only by rotating the fixing assembly, labor intensity is greatly reduced, and work efficiency is improved. And the seat production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the automotive field, and in particular to a seat backrest assembly tooling. Background Technology

[0002] With the booming development of the automotive industry, the demand for seats continues to grow, and the quality requirements are becoming increasingly stringent. As a key component of the seat, the quality and efficiency of the seat back panel directly affect the overall performance and production efficiency of the seat.

[0003] Existing fixtures can generally only fix the seat back frame and cannot rotate it. When workers use the fixtures to perform assembly work, they have to move around the seat back frame and arrange the back sets from different sides. This not only greatly increases the labor intensity of workers, but also seriously restricts the efficiency of seat production. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] To address the aforementioned problems, this application provides a chair backrest assembly tooling, comprising:

[0006] Base;

[0007] A fixing component is used to fix the seat back, and the fixing component is rotatably mounted on the base;

[0008] A locking assembly is disposed on the base and located on one side of the fixing assembly, the locking assembly being used to fix the fixing assembly radially.

[0009] Optionally, the fixing component includes a fixing plate, which is rotatably mounted on the base, and a plurality of limiting members are evenly arranged on the bottom of the fixing plate, wherein the plurality of limiting members are distributed in a circular pattern.

[0010] The locking assembly includes a driving part and a limiting block. The driving part is disposed on the fixed plate, and the limiting block is disposed on the driving part. The driving part can drive the limiting block to move on the fixed plate for fixing the limiting member.

[0011] Optionally, the limiting block has a limiting groove matching the limiting member on the side away from the driving part.

[0012] Optionally, the drive unit includes:

[0013] A baffle, wherein the baffle is disposed on the fixed plate;

[0014] A first elastic element is disposed between the baffle and the limiting block. In the natural state of the first elastic element, the limiting element is located in the limiting groove.

[0015] A drive rod is rotatably mounted on the fixed plate at its center. When one end of the drive rod rotates outward, its other end will drive the limiting block to slide toward the baffle on the fixed plate.

[0016] Optionally, the limiting block is provided with a driving groove, and the other end of the driving rod is slidably disposed in the driving groove.

[0017] Optionally, the limiting block is provided with multiple positioning grooves, and a positioning rod is provided on the fixing plate at the position matching the positioning groove, wherein the length of the positioning groove is greater than the diameter of the positioning rod.

[0018] Optionally, the drive unit further includes a top plate, which is disposed on the baffle and the limiting block, and the top plate is connected to the baffle and the positioning rod.

[0019] Optionally, the fixing component further includes:

[0020] A fixed ear plate is provided on the fixed plate, and a rotating shaft is provided between the fixed ear plates;

[0021] A fixing seat is provided on the rotating shaft, and an angle adjustment structure is provided between the fixing seat and the fixing ear plate.

[0022] Optionally, the angle adjustment structure includes:

[0023] The first limiting chuck is sleeved on the rotating shaft and connected to the fixed ear plate. The first limiting chuck has a plurality of slots along the axial direction of the rotating shaft.

[0024] The second limiting chuck is disposed on the fixed base, and the second limiting chuck is provided with a limiting protrusion that matches the bayonet opening;

[0025] A limiting ring is disposed on the rotating shaft;

[0026] The second elastic element is disposed between the limiting ring and the fixed ear plate. When the rotating shaft moves along its axial direction, the limiting ring will compress the second elastic element.

[0027] Optionally, the mounting base includes:

[0028] A first positioning plate is disposed on the first end of the rotating shaft. A first card seat is disposed on the first positioning plate, and a first fixing rod is disposed on the first positioning plate and located between the first card seats.

[0029] The second positioning plate is disposed on the second end of the rotating shaft. The second positioning plate is provided with a second card seat. A second fixing rod is disposed on the second positioning plate and located between the second card seats. The second positioning plate is also provided with a limiting seat. A limiting rod is rotatably disposed on the limiting seat. A limiting protrusion is provided on the first end of the limiting rod. When the second end of the limiting rod moves from the first position to the second position, the limiting protrusion moves from being located inside the limiting seat to being outside the limiting seat, thus protruding from the limiting seat.

[0030] Beneficial effects

[0031] The seat backrest assembly tooling provided in the embodiments of this utility model is rotatably mounted on the base by a fixing component, which facilitates the rotation of the seat backrest assembly. During operation, the worker does not need to move around the seat backrest frame; they can simply rotate the fixing component to easily assemble each side of the seat backrest assembly, greatly reducing labor intensity and improving seat production efficiency. The locking component can lock and fix the rotation of the fixing component, reducing the probability of the fixing component rotating during operation and improving stability. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the tooling for the seat backrest assembly of this utility model;

[0033] Figure 2 This is a structural diagram of the locking assembly of the seat backrest kit of this utility model;

[0034] Figure 3 This is a cross-sectional view of the locking assembly of the seat backrest kit of this utility model;

[0035] Figure 4 This is a side view of the tooling structure of the seat backrest assembly of this utility model;

[0036] Figure 5 This is a structural diagram of the seat back set tooling fixing seat and angle adjustment structure of this utility model.

[0037] [Explanation of Labels in the Attached Image]

[0038] 1. Base; 2. Fixing assembly; 21. Fixing plate; 22. Limiting component; 23. Fixing ear plate; 24. Rotating shaft; 25. Fixing seat; 251. First positioning plate; 252. First card seat; 253. First fixing rod; 254. Second positioning plate; 255. Second card seat; 256. Second fixing rod; 257. Limiting rod; 26. Angle adjustment structure; 261. First limiting chuck; 262. Bayonet; 263. Second limiting chuck; 264. Limiting protrusion; 265. Limiting ring; 266. Second elastic component; 3. Locking assembly; 31. Drive unit; 311. Baffle; 312. First elastic component; 313. Drive rod; 314. Positioning rod; 315. Top plate; 32. Limiting block. Detailed Implementation

[0039] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See also Figure 1-5 As shown, a seat backrest assembly tooling is provided according to an embodiment of this application, characterized in that it includes:

[0041] Base 1;

[0042] Fixing component 2, which is used to fix the seat back, is rotatably mounted on the base 1;

[0043] Locking component 3 is disposed on the base 1 and located on one side of the fixing component 2. The locking component 3 is used to fix the fixing component 2 radially.

[0044] Specifically, base 1 is made of high-strength steel, possessing a stable structure and high load-bearing capacity, ensuring that the fixture will not shake or shift during use. Fixing component 2 is used to install and secure the seat back frame, facilitating subsequent assembly of the seat back. Fixing component 2 is rotatably mounted on base 1, allowing workers to rotate it horizontally to rotate the seat back, facilitating assembly from different sides. Locking component 3 is located on base 1 and secures fixing component 2 radially. When using this seat back assembly fixture, the seat back frame is fixed to fixing component 2 for assembly. When different sides of the seat back assembly need to be adjusted, locking component 3 can be loosened, and fixing component 2 can be manually rotated to the appropriate position. After rotation, locking component 3 is tightened again, locking fixing component 2 in its current position, allowing workers to proceed with the assembly. This allows workers to easily assemble the various surfaces of the seat back frame without having to move around the frame during operation. They can simply rotate the fixed component 2 to assemble the seat back frame, greatly reducing labor intensity and improving seat production efficiency.

[0045] The fixing component 2 includes a fixing plate 21, which is rotatably mounted on the base 1. A plurality of limiting members 22 are evenly arranged at the bottom of the fixing plate 21, and the plurality of limiting members 22 are distributed in a circular pattern.

[0046] The locking assembly 3 includes a driving part 31 and a limiting block 32. The driving part 31 is disposed on the fixing plate 21, and the limiting block 32 is disposed on the driving part 31. The driving part 31 can drive the limiting block 32 to move on the fixing plate 21 for fixing the limiting member 22.

[0047] Specifically, the fixing component 2 includes a fixing plate 21, which is rotatably mounted on the base 1 via bearings. This ensures that the fixing plate 21 can still rotate flexibly and smoothly relative to the base 1 while supporting the seat back, with a smooth rotation process without any jamming. The fixing plate 21 is made of lightweight aluminum alloy and is precision-machined, reducing the overall weight while ensuring structural strength, making it easier for workers to operate. Several limiting members 22 are evenly distributed at the bottom of the fixing plate 21 in a circular pattern. The locking component 3 includes a drive unit 31 and a limiting block 32. The drive unit 31 is disposed on the fixing plate 21 and connected to the limiting block 32. The drive unit 31 can drive the limiting block 32 to move on the fixing plate 21, thereby contacting and limiting the limiting member 22 to prevent the fixing plate 21 from rotating during the assembly process. When the fixed plate 21 needs to be rotated, the drive unit 31 drives the limit block 32 to move, and the limit block 32 disengages from the limit member 22. At this time, the limit block 32 no longer locks and fixes the limit member, and the staff can rotate it according to the usage requirements, which is convenient for sorting different sides of the set and is easy to operate.

[0048] The limiting components 22 are at least four in number, symmetrically distributed in pairs at the bottom of the fixing plate 21. This allows for rotation of at least four sides of the set, facilitating the arrangement of the set by workers from at least four sides.

[0049] The limiting member 22 can be a circular cylinder or a rectangular cylinder.

[0050] The limiting block 32 has a limiting groove on the side away from the driving part 31 that matches the limiting member 22.

[0051] Specifically, a limiting groove is provided on the limiting block 32, the size of which matches the size of the limiting member 22. When limiting, the limiting member 22 is located within the limiting groove, which can firmly lock and fix the limiting member 22, improving the locking and fixing efficiency. Furthermore, arc-shaped sections recessed towards the limiting groove can be provided on both sides of the limiting groove, which facilitates the sliding of the limiting member 22 into the limiting groove, greatly improving the convenience of the limiting groove in locking and fixing the limiting member 22.

[0052] The drive unit 31 includes:

[0053] Baffle 311, the baffle 311 is disposed on the fixing plate 21;

[0054] The first elastic element 312 is disposed between the baffle 311 and the limiting block 32. In the natural state of the first elastic element 312, the limiting element 22 is located in the limiting groove.

[0055] The driving rod 313 is rotatably mounted on the fixed plate 21 at its middle part. When one end of the driving rod 313 rotates outward, its other end will drive the limiting block 32 to slide toward the baffle 311 on the fixed plate 21.

[0056] Specifically, the baffle 311 is firmly mounted on the fixed plate 21 and is made of stainless steel, which has high strength and corrosion resistance. The first elastic element 312 is disposed between the baffle 311 and the limiting block 32. The baffle 311 provides a fixed support point for the first elastic element 312, ensuring that the first elastic element 312 can function normally. In the natural state of the first elastic element 312, the limiting element 22 is located in the limiting groove. At this time, the first elastic element 312 is in a pre-tightened state, providing a stable thrust to the limiting block 32, so that it can tightly cooperate with the limiting element 22 to fix the fixed plate 21.

[0057] The drive rod 313 is rotatably mounted on the fixed plate 21 via a pin, forming a lever structure. The drive rod 313 is made of high-strength carbon steel, possessing good rigidity and toughness. When one end of the drive rod 313 rotates outward, according to the lever principle, its other end drives the limiting block 32 to slide towards the baffle 311 on the fixed plate 21. During this process, the first elastic element 312 is compressed, and the limiting block 32 separates from the limiting element 22, thereby releasing the lock on the fixed plate 21 and allowing it to rotate freely. When the fixed plate 21 is rotated, and the next limiting element 22 moves to the position of the limiting groove, the drive rod 313 is loosened. Driven by the elastic potential energy of the first elastic element 312, the limiting block 32 can move towards the limiting element 22, locking and fixing the limiting element 22. This facilitates subsequent assembly at this position.

[0058] The limiting block 32 has multiple positioning grooves, and the fixing plate 21 is provided with a positioning rod 314 at the matching position of the positioning groove. The length of the positioning groove is greater than the diameter of the positioning rod 314.

[0059] Specifically, the limiting block 32 has multiple positioning slots, and the fixing plate 21 has a positioning rod 314 at a position corresponding to the positioning slot. The length of the positioning slot is greater than the diameter of the positioning rod 314, allowing the limiting block 32 to make fine adjustments within a certain range. When the limiting block 32 slides under the drive of the drive rod 313, the positioning rod 314 moves within the positioning slot, serving as a guide and for fine-tuning the positioning. On the one hand, this prevents the limiting block 32 from shifting or getting stuck during sliding, ensuring the accuracy and smoothness of its movement; on the other hand, when the limiting block 32 and the limiting member 22 are locked together, the positioning rod 314 can fall into different positions within the positioning slot, achieving more precise positioning of the limiting block 32, further enhancing the stability of the fixing plate 21, and preventing the fixing plate 21 from rotating slightly due to vibration or external force interference during the assembly process, thereby ensuring the accuracy and quality of the seat back assembly.

[0060] The driving unit 31 also includes a top plate 315, which is disposed on the baffle 311 and the limiting block 32, and is connected to the baffle 311 and the positioning rod 314.

[0061] Specifically, the top plate 315 is mounted on the baffle 311 and the limiting block 32 to ensure the strength and durability of the overall structure. The top plate 315 and the baffle 311 are firmly connected by welding to ensure that they will not loosen during frequent use of the tooling. At the same time, the top plate 315 and the positioning rod 314 are bolted together, which facilitates installation and disassembly and makes it easier to maintain and repair the tooling later. The top plate 315 serves to strengthen the structure by connecting the baffle 311 and the limiting block 32, making the force transmission of the drive unit 31 more uniform and stable during operation.

[0062] The fixing component 2 also includes:

[0063] A fixed ear plate 23 is provided on the fixed plate 21, and a rotating shaft 24 is provided between the fixed ear plates 23;

[0064] A fixed base 25 is disposed on the rotating shaft 24, and an angle adjustment structure 26 is provided between the fixed base 25 and the fixed ear plate 23.

[0065] Specifically, the fixed ear plates 23 are symmetrically mounted on the fixed plate 21 to support the rotating shaft 24. The rotating shaft 24 passes through a pre-drilled shaft hole in the fixed ear plate 23, and a high-precision sliding bearing is used to engage with the shaft hole to reduce frictional resistance during rotation, allowing the fixed seat 25 to rotate vertically around the rotating shaft 24. The fixed seat 25 is installed on both sides of the rotating shaft 24 and is used to place and fix the seat back frame. An angle adjustment structure 26 is provided between the fixed seat 25 and the fixed ear plates 23. Through the angle adjustment structure 26, the operator can rotate the seat back frame installed on the fixed seat 25 in the vertical plane, realizing the installed seat back set in a vertical, forward tilted, and backward tilted state, which facilitates the subsequent adjustment of the set by the worker and improves the installation quality after the set is installed.

[0066] The angle adjustment structure 26 includes:

[0067] The first limiting chuck 261 is sleeved on the rotating shaft 24 and connected to the fixed ear plate 23. The first limiting chuck 261 has a plurality of slots 262 along the axial direction of the rotating shaft 24.

[0068] The second limiting chuck 263 is disposed on the fixed base 25, and the second limiting chuck 263 is provided with a limiting protrusion 264 that matches the bayonet 262;

[0069] A limiting ring 265 is disposed on the rotating shaft 24;

[0070] The second elastic element 266 is disposed between the limiting ring 265 and the fixed ear plate 23. When the rotating shaft 24 moves along its axial direction, the limiting ring 265 will compress the second elastic element 266.

[0071] Specifically, the limiting ring 265 is fixedly sleeved on the rotating shaft 24, and the second elastic element 266 is disposed between the limiting ring 265 and the fixed ear plate 23. When an external force drives the rotating shaft 24 to move along its axial direction, the limiting ring 265 will move accordingly and compress the second elastic element 266. In its natural state, the second elastic element 266 is in a moderately pre-tightened state, pushing the limiting ring 265 to make the first limiting chuck 261 and the second limiting chuck 263 fit tightly together, and the limiting protrusion 264 is engaged in the slot 262 to lock the angle of the fixed seat 25. When the angle of the fixed seat 25 needs to be adjusted, the rotating shaft 24 can be pulled axially. At this time, the limiting ring 265 can press the second elastic element 266, and the limiting protrusion 264 on the second limiting chuck 263 will disengage from the slot 262 of the first limiting chuck 261. At this time, the tilt angle of the fixed seat 25 can be adjusted by rotation. After the adjustment is completed, the elastic potential energy of the second elastic element 266 will drive the lower limiting protrusion 264 to engage in the slot 262, thereby realizing the adjustment of the angle of the fixed seat 25 from the vertical direction, which is convenient for the staff to carry out the operation of the set.

[0072] The first limiting chuck 261 has a number of slots 262 evenly distributed along the direction of the rotating shaft 24. These slots 262 are evenly distributed and have a groove shape that matches the limiting protrusion 264.

[0073] The second limiting chuck 263 is provided with a limiting protrusion 264 that matches the bayonet 262, and the number of limiting protrusions 264 is at least one.

[0074] The fixing base 25 includes:

[0075] A first positioning plate 251 is disposed on the first end of the rotating shaft 24. A first card seat 252 is disposed on the first positioning plate 251 and a first fixing rod 253 is disposed on the first positioning plate 251 and located between the first card seats 252.

[0076] A second positioning plate 254 is disposed on the second end of the rotating shaft 24. A second card seat 255 is disposed on the second positioning plate 254. A second fixing rod 256 is disposed on the second positioning plate 254 and located between the second card seats 255. A limiting seat is also disposed on the second positioning plate 254. A limiting rod 257 is rotatably disposed on the limiting seat. A limiting protrusion is disposed on the first end of the limiting rod 257. When the second end of the limiting rod 257 moves from the first position to the second position, the limiting protrusion moves from inside the limiting seat to outside the limiting seat, presenting a state of protruding from the limiting seat.

[0077] Specifically, the first positioning plate 251 and the second positioning plate 254 are used to connect the connecting plate of the seat back frame. The first fixing rod 253 is inserted into the hole on one end of the connecting plate, and the first bracket 252 can fix the bottom of one end of the connecting plate from the bottom. The second fixing rod 256 can be inserted into the hole on the other end of the connecting plate, and the second bracket 255 can fix the bottom of the other end of the connecting plate from the bottom, improving the stability of the seat back frame. In addition, a limiting rod 257 is also installed on the second positioning plate 254. The limiting protrusion on the limiting rod 257 can be lifted after the connecting plate is installed in the second bracket 255, thereby locking and fixing the installed connecting plate. The fixing performance is more stable, preventing displacement or shaking during the assembly process, and greatly enhancing the stability of the seat back frame.

[0078] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0079] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0080] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0081] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A seat back kit, characterized by, Include: Base (1); Fixed assembly (2) for fixing the seat back, the fixed assembly (2) is rotatably arranged on the base (1); Locking assembly (3) is arranged on the base (1), and is located on one side of the fixed assembly (2), the locking assembly (3) is used for fixing the fixed assembly (2) from the radial.

2. The seat back kit of claim 1, wherein, The fixed assembly (2) includes a fixed plate (21), which is rotatably arranged on the base (1), and a plurality of limiting pieces (22) are uniformly arranged on the bottom of the fixed plate (21), and a plurality of limiting pieces (22) are circularly distributed; The locking assembly (3) includes a driving part (31) and a limiting block (32), the driving part (31) is arranged on the fixed plate (21), the limiting block (32) is arranged on the driving part (31), the driving part (31) can drive the limiting block (32) to move on the fixed plate (21), and the limiting block (32) is used for fixing the limiting piece (22).

3. The seat back kit of claim 2, wherein, The limiting block (32) is away from the driving part (31) side opening has with the limiting piece (22) matching limiting groove.

4. The seat back kit of claim 3, wherein, The driving part (31) includes: Baffle (311), the baffle (311) is arranged on the fixed plate (21); First elastic piece (312), the first elastic piece (312) is arranged between the baffle (311) and the limiting block (32), in the natural state of the first elastic piece (312), the limiting piece (22) is located in the limiting groove; Driving rod (313), the middle part of the driving rod (313) is rotatably arranged on the fixed plate (21), when one end of the driving rod (313) rotates outward, the other end will drive the limiting block (32) to slide on the fixed plate (21) towards the baffle (311).

5. The seat back kit of claim 4, wherein, The limiting block (32) is provided with a driving groove, and the other end of the driving rod (313) is slidably arranged in the driving groove.

6. The seat back kit of claim 5, wherein, A plurality of positioning grooves are formed in the limiting block (32), a positioning rod (314) is arranged on the fixed plate (21) and matches the positioning grooves, and the length of the positioning groove is greater than the diameter of the positioning rod (314).

7. The seat back kit of claim 6, wherein, The driving part (31) further includes a top plate (315), the top plate (315) is arranged on the baffle (311) and the limiting block (32), and the top plate (315) is connected with the baffle (311) and the positioning rod (314).

8. The seat back kit of claim 2, wherein, The fixed assembly (2) further includes: Fixed lug plate (23), the fixed lug plate (23) is arranged on the fixed plate (21), and the rotating shaft (24) is arranged between the fixed lug plate (23); Fixed seat (25), the fixed seat (25) is arranged on the rotating shaft (24), and the angle adjusting structure (26) is arranged between the fixed seat (25) and the fixed lug plate (23).

9. The seat back kit of claim 8, wherein, The angle adjusting structure (26) includes: A first limiting chuck (261) is sleeved on the rotating shaft (24) and connected with the fixed lug plate (23), and a plurality of notches (262) are formed in the first limiting chuck (261) along the axial direction of the rotating shaft (24); A second limiting chuck (263) is arranged on the fixed seat (25), and a limiting protrusion (264) matched with the notches (262) is formed in the second limiting chuck (263); A limiting ring (265) is arranged on the rotating shaft (24); A second elastic member (266) is arranged between the limiting ring (265) and the fixed lug plate (23), and the limiting ring (265) compresses the second elastic member (266) when the rotating shaft (24) moves along the axial direction.

10. The seat back kit of claim 9, wherein, The fixed seat (25) comprises: A first positioning plate (251) is arranged on the first end of the rotating shaft (24), and a first clamping seat (252) is arranged on the first positioning plate (251); first fixing rods (253) are arranged on the first positioning plate (251) between the first clamping seats (252); A second positioning plate (254) is arranged on the second end of the rotating shaft (24), and a second clamping seat (255) is arranged on the second positioning plate (254); second fixing rods (256) are arranged on the second positioning plate (254) between the second clamping seats (255); a limiting seat is further arranged on the second positioning plate (254), and a limiting rod (257) is rotatably arranged on the limiting seat; a limiting protrusion is arranged on the first end of the limiting rod (257), and the limiting protrusion moves from inside the limiting seat to the outside of the limiting seat when the second end of the limiting rod (257) moves from the first position to the second position, and the limiting protrusion protrudes out of the limiting seat.

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