A convenient fixing device for scaffolding boards

By using anti-warping fixing components and a rotating disc structure, the stability problem of the scaffold board fixing device is solved, achieving stable fixing and convenient disassembly of the scaffold boards.

CN224495763UActive Publication Date: 2026-07-14XINJIANG CONSTR ENG GRP

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XINJIANG CONSTR ENG GRP
Filing Date
2025-08-20
Publication Date
2026-07-14

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Abstract

The utility model relates to a support scaffold convenient fixing device, and relates to support device field, including support, fixed cross bar and scaffold, fixed cross bar is fixedly connected with support through fixing piece, and fixed cross bar is equipped with prevent edge warping fixed part, and scaffold is connected with fixed cross bar through prevent edge warping fixed part, prevent edge warping fixed part includes prevent edge warping scaffold lock, rectangular frame fixture, ring fixture and spacing clamping assembly, fixed cross bar is inserted in ring fixture, and the outer wall of ring fixture is fixedly connected with the lower surface of rectangular frame fixture, and scaffold is inserted in rectangular frame fixture, the top of prevent edge warping scaffold lock is connected with the lower surface of scaffold, the bottom of prevent edge warping scaffold lock is connected with the top of spacing clamping assembly, and the bottom of spacing clamping assembly is connected with the bottom of rectangular frame fixture inner wall, beneficial effect: the transverse sliding of scaffold that the transverse force is exerted to scaffold when worker stands or walks on scaffold is avoided, and the stability of fixed scaffold is improved.
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Description

Technical Field

[0001] This utility model relates to the technical field of profile processing equipment, and in particular to a convenient fixing device for support scaffold boards. Background Technology

[0002] As is widely known, scaffolding is an important facility in construction engineering. It consists of a frame erected by scaffold pipes and scaffold boards laid on the frame. Scaffold boards, also known as scaffold planks, are temporary construction tools used to facilitate workers to walk, transport materials, and carry out construction work on them.

[0003] Chinese patent CN220319108U discloses a scaffolding board fixing device, comprising two pressure plate assemblies and

[0004] Two hook-and-hanging assemblies and a pressure plate assembly clamp the scaffold planks, and hooks are used to fix the scaffold planks to the scaffold tubes. However, in actual use, the following problems still exist:

[0005] When installing scaffold boards, the scaffold boards need to extend beyond the fixing rods to ensure that the scaffold boards are fully resting on the fixing crossbars before being fixed. When workers walk over the edge of the scaffold boards, stepping on the edge causes the edge of the scaffold boards to lift. At the same time, workers standing or walking on the scaffold boards apply lateral force, causing the scaffold boards to slide laterally. The friction generated by clamping alone cannot stably prevent the scaffold boards from sliding, resulting in low stability of the fixation.

[0006] Therefore, a convenient fixing device for scaffold boards is proposed. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a convenient fixing device for support scaffold boards.

[0008] To achieve the aforementioned objective, this utility model adopts the following technical solution:

[0009] A convenient fixing device for scaffold boards includes a support, a fixed crossbar, and scaffold boards. The fixed crossbar is fixedly connected to the support via a fixing member. The fixed crossbar is equipped with an anti-warping edge fixing component. The scaffold boards are connected to the fixed crossbar via the anti-warping edge fixing component. The anti-warping edge fixing component includes an anti-warping scaffold board lock, a rectangular frame clamp, a ring clamp, and a limiting clamping assembly. The fixed crossbar is inserted into the ring clamp, and the outer wall of the ring clamp is fixedly connected to the lower surface of the rectangular frame clamp. The scaffold boards are inserted into the rectangular frame clamp. Several anti-warping scaffold board locks are provided and are evenly distributed on the inner wall of the rectangular frame clamp. The top end of each anti-warping scaffold board lock is connected to the lower surface of the scaffold board, and the bottom end of each anti-warping scaffold board lock is connected to the top end of the limiting clamping assembly. The bottom end of the limiting clamping assembly is connected to the bottom end of the inner wall of the rectangular frame clamp.

[0010] The anti-warping scaffold board lock includes an anti-warping limiting rod, a sliding rod, and a rotating lock. The bottom end of the inner wall of the rectangular frame clamp is provided with a rotating groove, and the side of the rectangular frame clamp in the opening direction is provided with a sliding groove, which is connected to the rotating groove. The anti-warping limiting rod has an "L" shape and contacts the scaffold board. The sliding rod is located in the sliding groove and is slidably connected to the rectangular frame clamp. One end of the sliding rod is connected to one end of the anti-warping limiting rod, and the other end of the sliding rod is connected to the rotating lock located in the rotating groove. The top end of the rotating lock is connected to the scaffold board, and the bottom end of the rotating lock is connected to the top end of the limiting clamping assembly.

[0011] The rotary lock includes a rotating disk, a connecting rod, a push column, a rotating shaft, and a locking element. The rotating disk is located in the rotating groove and contacts the rectangular frame clamp. The lower surface of the rotating disk is fixedly connected to the top of the push column, and the push column is close to the edge of the rotating disk. One end of the connecting rod is rotatably connected to the push column, and the other end of the connecting rod is hinged to the sliding rod through a pin. The center of the lower surface of the rotating disk is fixedly connected to the top of the rotating shaft. The bottom end of the rotating shaft is located in the rotating groove and rotatably connected to the rectangular frame clamp. The lower surface of the rotating disk is connected to the top of the limiting clamping assembly. The upper surface of the rotating disk is connected to the scaffold board through the locking element.

[0012] The locking component includes a square sliding block, a lock head, and a spring. The upper surface of the rotating disk is provided with a locking component groove. The square sliding block is located in the locking component groove and is slidably connected to the rotating disk. The bottom end of the square sliding block is connected to the rotating disk through the spring. The top end of the square sliding block is connected to the bottom end of the lock head. The lower surface of the scaffold board is provided with a locking groove. The top end of the lock head is located in the locking groove and contacts the scaffold board. The side of the lock head that rotates around the axis of the rotating disk and contacts the scaffold board is an arc-shaped surface. The side of the lock head that slides and contacts the scaffold board along the direction of the rectangular frame clamp opening is a plane. The shape of the locking groove corresponds to the shape of the top end of the lock head.

[0013] The limiting clamping assembly includes a limiting top post, and the lower surface of the rotating disk is provided with an arc-shaped sliding groove. The bottom end of the limiting top post is located in the rotating groove and is fixedly connected to the rectangular frame clamp. The top end of the limiting top post is located in the arc-shaped sliding groove and is slidably connected to the rotating disk. The depth of the arc-shaped sliding groove gradually decreases from one end of the arc-shaped sliding groove to the other end of the arc-shaped sliding groove.

[0014] The anti-warping limit rod includes a horizontal rod, a plug-in post, and a vertical rod. One end of the horizontal rod is fixedly connected to the sliding rod, and the upper surface of the other end of the horizontal rod is provided with a plug-in hole. The bottom end of the vertical rod is fixedly connected to the top end of the plug-in post, and the plug-in post is inserted into the plug-in hole. The side of the vertical rod near the rectangular frame clamp is in contact with the scaffold board.

[0015] An auxiliary turntable is provided on the rotating shaft, and a rotating shaft hole is provided on the lower surface of the rectangular frame fixture. The rotating shaft hole is connected to the rotating groove, and the bottom end of the rotating shaft passes through the rotating shaft hole and is fixedly connected to the auxiliary turntable located below the rectangular frame fixture.

[0016] Compared with the prior art, this utility model has the following beneficial effects: By locking the scaffold planks horizontally, the horizontal force applied to the scaffold planks by workers standing or walking on them is prevented from causing lateral slippage, thus improving the stability of the fixed scaffold planks. At the same time, the anti-warping limit rod has an "L"-shaped structure, which supports the edge of the scaffold planks and prevents warping caused by stepping on the edge of the scaffold planks, further improving the stability of the fixed scaffold planks. The scaffold planks are clamped together by the rotating plate and the rectangular frame clamp, which improves the stability of the fixed scaffold planks. The insertion post is pulled out from the insertion hole by the vertical rod, and the horizontal rod is pushed to unlock the scaffold planks. The scaffold planks can be directly pulled out from the rectangular frame clamp, and workers can disassemble the scaffold planks without the aid of tools, thus improving the efficiency of disassembling the scaffold planks. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This utility model Figure 1 A magnified three-dimensional structural diagram at point A is shown;

[0019] Figure 3 This is a three-dimensional structural diagram of the anti-warping fixing component of this utility model;

[0020] Figure 4 This is a top-view structural diagram of the anti-warping edge fixing component of this utility model;

[0021] Figure 5 This is a bottom view of the cross-sectional structure of the anti-warping fixing component of this utility model;

[0022] Figure 6 This is a side view of the cross-sectional structure of the anti-warping fixing component of this utility model;

[0023] Figure 7 This utility model Figure 3 A magnified structural diagram of point B is shown below;

[0024] Figure 8 This utility model Figure 5 A magnified structural diagram of point C is shown below;

[0025] Figure 9 This utility model Figure 6 A magnified structural diagram of point D is shown below;

[0026] Figure 10 This utility model Figure 6 The diagram shows the cross-sectional structure at point D in the locked state.

[0027] 1. Bracket; 2. Fixed crossbar; 3. Scaffold board; 4. Rectangular frame clamp; 5. Ring clamp; 6. Anti-warping limit rod; 7. Sliding rod; 8. Rotating groove; 9. Sliding groove; 10. Rotating disk; 11. Connecting rod; 12. Push column; 13. Rotating shaft; 14. Square sliding block; 15. Lock head; 16. Spring; 17. Locking groove; 18. Lock groove; 19. Limiting top column; 20. Arc groove; 21. Horizontal rod; 22. Insertion column; 23. Vertical rod; 24. Insertion hole; 25. Auxiliary turntable; 26. Rotating shaft hole. Detailed Implementation

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0029] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, and in part will be obvious from the description or may be learned by practice of the invention.

[0030] like Figure 1-4 As shown, a convenient fixing device for scaffold boards includes a support 1, a fixed crossbar 2, and scaffold boards 3. The fixed crossbar 2 is fixedly connected to the support 1 through a fixing member. The fixed crossbar 2 is provided with an anti-warping edge fixing component. The scaffold board 3 is connected to the fixed crossbar 2 through the anti-warping edge fixing component. The anti-warping edge fixing component includes an anti-warping scaffold board lock, a rectangular frame clamp 4, an annular clamp 5, and a limiting clamping assembly. The fixed crossbar 2 is inserted into the annular clamp 5. The outer wall of the annular clamp 5 is fixedly connected to the lower surface of the rectangular frame clamp 4. The scaffold board 3 is inserted into the rectangular frame clamp 4. Several anti-warping scaffold board locks are provided and are evenly distributed on the inner wall of the rectangular frame clamp 4. The top end of the anti-warping scaffold board lock is connected to the lower surface of the scaffold board 3, and the bottom end of the anti-warping scaffold board lock is connected to the top end of the limiting clamping assembly. The bottom end of the limiting clamping assembly is connected to the bottom end of the inner wall of the rectangular frame clamp 4.

[0031] like Figure 2-6 As shown, the anti-warping scaffold board lock includes an anti-warping limiting rod 6, a sliding rod 7, and a rotating lock. The bottom of the inner wall of the rectangular frame clamp 4 is provided with a rotating groove 8, and the side of the rectangular frame clamp 4 in the opening direction is provided with a sliding groove 9, and the sliding groove 9 is connected to the rotating groove 8. The anti-warping limiting rod 6 has an "L" shaped structure and is in contact with the scaffold board 3. The sliding rod 7 is located in the sliding groove 9 and is slidably connected to the rectangular frame clamp 4. One end of the sliding rod 7 is connected to one end of the anti-warping limiting rod 6, and the other end of the sliding rod 7 is connected to the rotating lock located in the rotating groove 8. The top end of the rotating lock is connected to the scaffold board 3, and the bottom end of the rotating lock is connected to the top end of the limiting clamping assembly.

[0032] like Figure 5-9As shown, the rotary lock includes a rotary disk 10, a connecting rod 11, a push column 12, a rotating shaft 13, and a locking element. The rotary disk 10 is located in the rotating groove 8 and contacts the rectangular frame clamp 4. The lower surface of the rotary disk 10 is fixedly connected to the top of the push column 12, and the push column 12 is close to the edge of the rotary disk 10. One end of the connecting rod 11 is rotatably connected to the push column 12, and the other end of the connecting rod 11 is hinged to the sliding rod 7 through a pin. The center of the lower surface of the rotary disk 10 is fixedly connected to the top of the rotating shaft 13. The bottom end of the rotating shaft 13 is located in the rotating groove 8 and rotatably connected to the rectangular frame clamp 4. The lower surface of the rotary disk 10 is connected to the top of the limiting clamping assembly. The upper surface of the rotary disk 10 is connected to the scaffold board 3 through the locking element.

[0033] like Figure 7 , Figure 9 and Figure 10 As shown, the locking mechanism includes a square sliding block 14, a lock head 15, and a spring 16. The upper surface of the rotating disk 10 is provided with a locking mechanism groove 17. The square sliding block 14 is located in the locking mechanism groove 17 and is slidably connected to the rotating disk 10. The bottom end of the square sliding block 14 is connected to the rotating disk 10 through the spring 16. The top end of the square sliding block 14 is connected to the bottom end of the lock head 15. The lower surface of the scaffold board 3 is provided with a locking groove 18. The top end of the lock head 15 is located in the locking groove 18 and contacts the scaffold board 3. The side of the lock head 15 that rotates around the axis of the rotating disk 10 and contacts the scaffold board 3 is an arc-shaped surface. The side of the lock head 15 that slides and contacts the scaffold board 3 along the opening direction of the rectangular frame clamp 4 is a flat surface. The shape of the locking groove 18 corresponds to the shape of the top end of the lock head 15.

[0034] like Figure 8-10 As shown, the limiting clamping assembly includes a limiting top post 19, and an arc groove 20 is provided on the lower surface of the rotating disk 10. The bottom end of the limiting top post 19 is located in the rotating groove 8 and is fixedly connected to the rectangular frame clamp 4. The top end of the limiting top post 19 is located in the arc groove 20 and is slidably connected to the rotating disk 10. The depth of the arc groove 20 gradually decreases from one end of the arc groove 20 to the other end of the arc groove 20.

[0035] like Figure 3 and Figure 6 As shown, the anti-warping limit rod 6 includes a horizontal rod 21, a plug-in post 22, and a vertical rod 23. One end of the horizontal rod 21 is fixedly connected to the sliding rod 7, and the upper surface of the other end of the horizontal rod 21 is provided with a plug-in hole 24. The bottom end of the vertical rod 23 is fixedly connected to the top end of the plug-in post 22. The plug-in post 22 is inserted into the plug-in hole 24, and the side of the vertical rod 23 near the rectangular frame clamp 4 is in contact with the scaffold board 3.

[0036] like Figure 4 , Figure 6 and Figure 9As shown, the rotating shaft 13 is provided with an auxiliary turntable 25, and the lower surface of the rectangular frame clamp 4 is provided with a rotating shaft hole 26. The rotating shaft hole 26 is connected to the rotating groove 8, and the bottom end of the rotating shaft 13 passes through the rotating shaft hole 26 and is fixedly connected to the auxiliary turntable 25 located below the rectangular frame clamp 4.

[0037] The work process is as follows:

[0038] S1, in use, first insert the fixed horizontal bar 2 into the annular clamp 5, then insert the scaffold board 3 into the rectangular frame clamp 4 and push it forward. When the scaffold board 3 contacts the vertical bar 23, continue pushing. The scaffold board 3 drives the horizontal bar 21 to slide outward through the vertical bar 23. The horizontal bar 21 drives the sliding rod 7 to slide outward in the sliding groove 9. The sliding rod 7 drives the rotating disk 10 to rotate around the rotating shaft 13 in the rotating groove 8 through the cooperation of the connecting rod 11 and the pushing column 12. When the scaffold board 3 moves into place, the spring 16 pushes the square sliding block 14 to slide upward in the locking groove 17, pressing the lock head 15 into the locking groove 18 on the lower surface of the scaffold board 3. The lock head 15 and the scaffold board 3 slide along the opening direction of the rectangular frame clamp 4. The contact surface is a plane. The scaffold board 3 is horizontally locked by the locking head 15, which prevents the scaffold board 3 from sliding laterally when workers stand or walk on it, thus improving the stability of the fixed scaffold board 3. Then, the fixing crossbar 2 is fixed to the bracket 1. The "L"-shaped anti-warping limit bar 6, which is composed of the horizontal bar 21, the plug-in column 22 and the vertical bar 23, limits the scaffold board 3 after locking it. At the same time, the horizontal bar 21 supports the edge of the scaffold board 3. When workers pass by the edge of the scaffold board 3, it prevents the edge from warping due to stepping on the edge of the scaffold board 3, further improving the stability of the fixed scaffold board 3.

[0039] S2, during the fixing process, as the rotating disk 10 rotates, the limiting top post 19 slides relative to the rotating disk 10 in the arc groove 20. The depth of the arc groove 20 gradually decreases from one end of the arc groove 20 to the other end. While the rotating disk 10 is rotating, it is lifted by the limiting top post 19. The rotating disk 10 and the rectangular frame clamp 4 work together to clamp the scaffold board 3, which improves the stability of fixing the scaffold board 3.

[0040] S3, when disassembly is required, the insertion post 22 is pulled out from the insertion hole 24 by the vertical rod 23, and the horizontal rod 21 is pushed. The horizontal rod 21 causes the rotating disk 10 to rotate in the opposite direction through the cooperation of the sliding rod 7 and the connecting rod 11. The scaffold board 3 squeezes the lock head 15. Since the surface of the lock head 15 that rotates around the axis of the rotating disk 10 and contacts the scaffold board 3 is an arc surface, the lock head 15 retracts into the locking groove 17. The scaffold board 3 can be directly pulled out from the rectangular frame clamp 4. Workers can disassemble the scaffold board 3 without the aid of tools, which improves the efficiency of disassembling the scaffold board 3.

[0041] If the horizontal bar 21 is difficult to push during disassembly, the auxiliary turntable 25 is rotated, and the auxiliary turntable 25 drives the rotating disk 10 to rotate via the rotating shaft 13 to unlock it.

[0042] The parts of this utility model not described in detail are prior art. Although this utility model has been specifically shown and introduced in conjunction with preferred embodiments, there are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. However, those skilled in the art should understand that various changes in form and detail can be made to this utility model without departing from the spirit and scope of this utility model as defined by the appended claims, and all such changes shall be within the protection scope of this utility model.

Claims

1. A convenient fixing device for scaffold boards, comprising a support (1), a fixing crossbar (2), and scaffold boards (3), wherein the fixing crossbar (2) is fixedly connected to the support (1) by a fixing member, characterized in that: The fixed crossbar (2) is provided with an anti-warping fixing component. The scaffold board (3) is connected to the fixed crossbar (2) through the anti-warping fixing component. The anti-warping fixing component includes an anti-warping scaffold board lock, a rectangular frame clamp (4), an annular clamp (5), and a limiting clamping assembly. The fixed crossbar (2) is inserted into the annular clamp (5). The outer wall of the annular clamp (5) is fixedly connected to the lower surface of the rectangular frame clamp (4). The scaffold board (3) is inserted into the rectangular frame clamp (4). There are several anti-warping scaffold board locks, and the anti-warping scaffold board locks are evenly distributed on the inner wall of the rectangular frame clamp (4). The top end of the anti-warping scaffold board lock is connected to the lower surface of the scaffold board (3). The bottom end of the anti-warping scaffold board lock is connected to the top end of the limiting clamping assembly. The bottom end of the limiting clamping assembly is connected to the bottom end of the inner wall of the rectangular frame clamp (4).

2. The convenient fixing device for scaffold boards according to claim 1, characterized in that: The anti-warping scaffold board lock includes an anti-warping limiting rod (6), a sliding rod (7), and a rotating lock. The bottom of the inner wall of the rectangular frame clamp (4) is provided with a rotating groove (8). The side of the rectangular frame clamp (4) in the opening direction is provided with a sliding groove (9), and the sliding groove (9) is connected to the rotating groove (8). The anti-warping limiting rod (6) has an "L" shaped structure. The anti-warping limiting rod (6) is in contact with the scaffold board (3). The sliding rod (7) is located in the sliding groove (9) and is slidably connected to the rectangular frame clamp (4). One end of the sliding rod (7) is connected to one end of the anti-warping limiting rod (6). The other end of the sliding rod (7) is connected to the rotating lock located in the rotating groove (8). The top end of the rotating lock is connected to the scaffold board (3), and the bottom end of the rotating lock is connected to the top end of the limiting clamping assembly.

3. The convenient fixing device for scaffold boards according to claim 2, characterized in that: The rotating lock includes a rotating disk (10), a connecting rod (11), a push column (12), a rotating shaft (13), and a locking element. The rotating disk (10) is located in the rotating groove (8) and contacts the rectangular frame clamp (4). The lower surface of the rotating disk (10) is fixedly connected to the top of the push column (12), and the push column (12) is close to the edge of the rotating disk (10). One end of the connecting rod (11) is rotatably connected to the push column (12), and the other end of the connecting rod (11) is hinged to the sliding rod (7) through a pin. The center of the lower surface of the rotating disk (10) is fixedly connected to the top of the rotating shaft (13). The bottom end of the rotating shaft (13) is located in the rotating groove (8) and rotatably connected to the rectangular frame clamp (4). The lower surface of the rotating disk (10) is connected to the top of the limiting clamping assembly. The upper surface of the rotating disk (10) is connected to the scaffold board (3) through the locking element.

4. The convenient fixing device for scaffold boards according to claim 3, characterized in that: The locking mechanism includes a square sliding block (14), a lock head (15), and a spring (16). A locking groove (17) is provided on the upper surface of the rotating disk (10). The square sliding block (14) is located within the locking groove (17) and slidably connected to the rotating disk (10). The bottom end of the square sliding block (14) is connected to the rotating disk (10) via the spring (16), and the top end of the square sliding block (14) is connected to the bottom end of the lock head (15). The scaffold... The lower surface of the plate (3) is provided with a locking groove (18). The top of the lock head (15) is located in the locking groove (18) and contacts the scaffold board (3). The side of the lock head (15) that rotates around the axis of the rotating disk (10) and contacts the scaffold board (3) is an arc surface. The side of the lock head (15) that slides in contact with the scaffold board (3) along the opening direction of the rectangular frame clamp (4) is a plane. The shape of the locking groove (18) corresponds to the shape of the top of the lock head (15).

5. A convenient fixing device for scaffold boards according to claim 3, characterized in that: The limiting clamping assembly includes a limiting top post (19), and the lower surface of the rotating disk (10) is provided with an arc groove (20). The bottom end of the limiting top post (19) is located in the rotating groove (8) and is fixedly connected to the rectangular frame clamp (4). The top end of the limiting top post (19) is located in the arc groove (20) and is slidably connected to the rotating disk (10). The depth of the arc groove (20) gradually decreases from one end of the arc groove (20) to the other end of the arc groove (20).

6. A convenient fixing device for scaffold boards according to claim 2, characterized in that: The anti-warping limit rod (6) includes a horizontal rod (21), a plug-in post (22), and a vertical rod (23). One end of the horizontal rod (21) is fixedly connected to the sliding rod (7). The upper surface of the other end of the horizontal rod (21) is provided with a plug-in hole (24). The bottom end of the vertical rod (23) is fixedly connected to the top end of the plug-in post (22). The plug-in post (22) is inserted into the plug-in hole (24). The side of the vertical rod (23) near the rectangular frame clamp (4) is in contact with the scaffold board (3).

7. A convenient fixing device for scaffold boards according to claim 3, characterized in that: An auxiliary turntable (25) is provided on the rotating shaft (13). A rotating shaft hole (26) is provided on the lower surface of the rectangular frame clamp (4). The rotating shaft hole (26) is connected to the rotating groove (8). The bottom end of the rotating shaft (13) passes through the rotating shaft hole (26) and is fixedly connected to the auxiliary turntable (25) located below the rectangular frame clamp (4).