Welding device for steel structure construction

Abstract

The invention relates to the technical field of welding auxiliary devices, in particular to a welding device for steel structure construction. Comprising a base, two arc-shaped plates are rotationally connected to the upper end of the base, the two arc-shaped plates are arranged in a bilateral symmetry mode, the ends of the two arc-shaped plates are fixedly connected through two mounting frames, a steel structure needing to be welded is located between the two mounting frames, and a plurality of clamping assemblies are arranged on the mounting frames in the length direction of the mounting frames in an array mode; a gravity center adjusting assembly is arranged on the rotating disc. According to the device, the clamping assembly is arranged, the bending angle, the elongation and the position of the elastic steel belt part protruding in the direction of the steel structure can be independently adjusted, and the special-shaped steel structure can be conveniently clamped.

Description

Technical Field

[0001] The invention relates to the technical field of a welding auxiliary device, and in particular to a welding device for steel structure construction. Background Art

[0002] Before the installation of the steel structure, it is generally necessary to fix a support seat for supporting the beam or other structures on it. The fixing position and angle of the support seat on the steel structure installed in different positions are different. And according to the installation requirements, the structure of some support seats is a heterogeneous structure. Therefore, the overall shape of the steel structure is mostly irregular before installation. In order to ensure the stability of the connection between the support seat and the steel structure, it is generally necessary to fully weld the support seat. In order to ensure the welding quality, it is necessary to frequently adjust the angle of the steel structure, so as to facilitate the welding of the support seat and the steel structure. In general, when the steel structure is welded to the support seat, after adjusting the angle of the steel structure, it is necessary to use a support device to support and stabilize the steel structure. In the subsequent welding process, the angle of the steel structure needs to be frequently changed, and the support device needs to be frequently used to support the steel structure. Therefore, the efficiency is low during welding. In addition, the stability performance is poor when using ordinary support devices to support the steel structure, and safety accidents are prone to occur during the welding process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a welding device for steel structure construction which is convenient for adjusting the angle of the steel structure and thus facilitates welding of a support seat on the steel structure.

[0004] In order to achieve the above object, the technical solution provided by the present invention is:

[0005] A welding device for steel structure construction comprises a base, wherein the upper end of the base is rotatably connected to two arc plates, the two arc plates are symmetrically arranged, the ends of the two arc plates are fixedly connected by two mounting frames, the steel structure to be welded is located between the two mounting frames, a plurality of clamping assemblies are arranged in an array along the length direction of the mounting frame, a turntable is concentrically fixed to the arc plate, and a center of gravity adjustment assembly is arranged on the turntable; the clamping assembly comprises two first rotating rods slidably arranged in the mounting frame, two second rotating rods are slidably arranged in the mounting frame between the two first rotating rods, the sliding directions of the first rotating rod and the second rotating rod in the mounting frame are parallel, the first rotating rod is parallel to the second rotating rod, the first rotating rod and the second rotating rod can rotate independently, and the two second rotating rods can rotate independently. A limit frame is fixed on the fixed frame between the rotating rods, and the elastic steel belt passes through the first rotating rod, the second rotating rod and the through grooves on the limit frame. The first rotating rod and the second rotating rod are both threadedly connected with fasteners that tightly press against the elastic steel belt. The elastic steel belt portion between the first rotating rod and its adjacent second rotating rod protrudes in an arc shape toward the steel structure, and the elastic steel belt portion between the two second rotating rods protrudes in an arc shape in the direction away from the steel structure. One end of the first rotating rod and the second rotating rod is provided with a rotation limit assembly, and the rotation limit assembly is slidably connected to the mounting frame. The sliding direction of the rotation limit assembly is parallel to the sliding direction of the first rotating rod. The other ends of the first rotating rod and the second rotating rod are rotatably connected with a driving block, and the driving block is connected to the position adjustment assembly.

[0006] Specifically, a first slide groove is provided in the mounting frames on both sides of the first rotating rod, and the core shaft of the first rotating rod passes through the first slide groove; a second slide groove is provided in the mounting frames on both sides of the second rotating rod, and the core shaft of the second rotating rod passes through the second slide groove; the length direction of the first slide groove and the second slide groove is parallel to the length direction of the mounting frame, and a turning handle is fixed on the core shaft of the first rotating rod and the second rotating rod.

[0007] Specifically, the rotation limit assembly includes a shell, mounting frames on the upper and lower sides of the shell are fixed with ridges, the shell is slidably arranged between the two ridges, a ratchet is rotatably arranged in the shell, a vertical rod is slidably arranged on the shell on one side of the ratchet, the vertical rod is connected to the shell through a first spring, one end of the vertical rod is located in the shell, a block is fixed at one end of the vertical rod in the shell, the block is inserted in a tooth gap of the ratchet, the other end of the vertical rod is located outside the shell, a connecting block is fixed at one end of the vertical rod outside the shell, the ratchet corresponding to the first rotating rod is fixedly connected concentrically with the core axis of the first rotating rod, and the ratchet corresponding to the second rotating rod is fixedly connected concentrically with the core axis of the second rotating rod.

[0008] Specifically, a cam rod is arranged between the connecting block and the mounting frame on one side thereof, the shaft rod of the cam rod is rotatably connected to the ear plate fixed on the mounting frame, a twist block is fixed on the shaft rod of the cam rod, and when the cam rod is rotated by the twist block and the shaft rod, the cam rod can drive the blocking block away from the ratchet through the connecting block and the vertical rod.

[0009] Specifically, the position adjustment assembly includes a screw rod, the length direction of the screw rod is parallel to the length direction of the mounting frame, the screw rod is fixedly connected to the mounting frame, the screw rod passes through a driving block on one side of the screw rod, the driving block is slidingly connected to a screw sleeve concentric with the screw rod, and the screw sleeve is threadedly connected to the screw rod.

[0010] Specifically, the center of gravity adjustment assembly includes a fixed ring, which is concentrically fixedly connected to the turntable, a connecting plate is concentrically fixedly connected to the fixed ring, a motor is eccentrically fixed on the connecting plate, a rotating wheel is eccentrically fixed on the output shaft of the motor, a rotating ring is concentrically fixed on the rotating wheel, a plurality of sliding rods are evenly distributed and slidably arranged on the fixed ring, the axial direction of the sliding rods is parallel to the radial direction of the fixed ring, a counterweight block is fixed at one end of the sliding rod away from the rotating ring, a top block is fixed at one end of the sliding rod facing the rotating ring, the top block is in sliding contact with the outer edge of the rotating ring, and a second spring is sleeved on the sliding rod between the top block and the fixed ring.

[0011] Specifically, a balancing block is eccentrically fixed on the connecting plate, and the balancing block is arranged opposite to the motor and is used to balance the weight of the motor.

[0012] Specifically, a rotating shaft is coaxially fixed on the rotating disk, the rotating shaft is rotatably connected to the support rod, the rotating shaft is fixedly connected to the arc plate through a plurality of connecting rods, and the support rod is fixedly connected to the base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The device is provided with a clamping assembly, and the bending angle, elongation and position of the elastic steel belt part protruding toward the steel structure can be adjusted separately, so as to facilitate clamping of heterogeneous steel structures.

[0015] 2. When the turntable rotates, the steel structure rotates accordingly, which makes it convenient to adjust the angle of the steel structure and facilitate welding.

[0016] 3. After the steel structure is rotated, the weight of the steel structure can be easily balanced through the center of gravity adjustment component, which can ensure the stability of the steel structure and the stability of the steel structure during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the device.

[0018] Figure 2 A schematic diagram of the clamping assembly.

[0019] Figure 3 The rear view of the clamping assembly.

[0020] Figure 4 Schematic diagram of the internal structure of the shell.

[0021] Figure 5 for Figure 4Magnified view of area A.

[0022] Figure 6 This is a diagram showing the position relationship between the cam rod and the connecting block.

[0023] Figure 7 Schematic diagram of the center of gravity adjustment component.

[0024] The names of the parts in the attached drawings are: 1. base; 2. support rod; 3. rotating shaft; 4. connecting rod; 5. arc plate; 6. mounting frame; 7. limiting frame; 8. elastic steel belt; 9. swivel; 10. rotating wheel; 11. first rotating rod; 12. fastener; 13. first slide groove; 14. second rotating rod; 15. second slide groove; 16. screw; 17. driving block; 18. turning handle; 19. screw sleeve; 20. shell; 21. convex ridge; 22. ratchet; 23. block; 24. vertical rod; 25. connecting block; 26. ear plate; 27. shaft rod; 28. screw block; 29. ​​cam rod; 30. first spring; 31. turntable; 32. fixing ring; 33. connecting plate; 34. top block; 35. slide rod; 36. counterweight block; 37. second spring; 38. motor; 39. balance block. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] like Figure 1-Figure 7 As shown, a welding device for steel structure construction includes a base 1, and two arc plates 5 are rotatably connected to the upper end of the base 1. The two arc plates 5 are arranged symmetrically, and a turntable 31 is concentrically fixed on the arc plate 5. Specifically, a rotating shaft 3 is concentrically fixed on the turntable 31, and the rotating shaft 3 is rotatably connected to the support rod 2. The rotating shaft 3 is fixedly connected to the arc plate 5 through a plurality of connecting rods 4, and the support rod 2 is fixedly connected to the base 1.

[0027] The ends of the two arc-shaped plates 5 are fixedly connected by two mounting frames 6 , and the steel structure to be welded is located between the two mounting frames 6 .

[0028] A plurality of clamping assemblies are arranged in an array along the length direction of the mounting frame 6. The clamping assembly includes two first rotating rods 11 slidably arranged in the mounting frame 6, and two second rotating rods 14 are slidably arranged in the mounting frame 6 between the two first rotating rods 11. The sliding directions of the first rotating rod 11 and the second rotating rod 14 in the mounting frame 6 are parallel, and the first rotating rod 11 is parallel to the second rotating rod 14. The first rotating rod 11 and the second rotating rod 14 can rotate independently. Specifically, a first sliding groove 13 is provided in the mounting frame 6 on both sides of the first rotating rod 11, and the core shaft of the first rotating rod 11 passes through the first sliding groove 13. A second sliding groove 15 is provided in the mounting frame 6 on both sides of the second rotating rod 14, and the core shaft of the second rotating rod 14 passes through the second sliding groove 15. The length direction of the first sliding groove 13 and the second sliding groove 15 is parallel to the length direction of the mounting frame 6, and a turning handle 18 is fixed on the core shaft of the first rotating rod 11 and the second rotating rod 14.

[0029] The limit frame 7 is fixed on the fixed frame between the two second rotating rods 14, the elastic steel belt 8 passes through the through slots on the first rotating rod 11, the second rotating rod 14 and the limit frame 7, and the first rotating rod 11 and the second rotating rod 14 are both threadedly connected with fasteners 12 that are tightly against the elastic steel belt 8, and the fasteners 12 can position the elastic steel belt 8. The elastic steel belt 8 between the first rotating rod 11 and the adjacent second rotating rod 14 is partially protruded in an arc shape toward the steel structure, and the elastic steel belt 8 between the two second rotating rods 14 is partially protruded in an arc shape in the direction away from the steel structure.

[0030] A rotation limiting assembly is disposed at one end of each of the first rotating rod 11 and the second rotating rod 14 . The rotation limiting assembly is slidably connected to the mounting bracket 6 , and a sliding direction of the rotation limiting assembly is parallel to a sliding direction of the first rotating rod 11 .

[0031] The rotation limiting assembly includes a shell 20, and convex ridges 21 are fixed on the mounting frames 6 on the upper and lower sides of the shell 20. The shell 20 is slidably arranged between the two convex ridges 21. A ratchet 22 is rotatably arranged in the shell 20, and a vertical rod 24 is slidably arranged on the shell 20 on one side of the ratchet 22. The vertical rod 24 is connected to the shell 20 through a first spring 30. One end of the vertical rod 24 is located in the shell 20, and a block 23 is fixed on one end of the vertical rod 24 in the shell 20. The block 23 is inserted into a tooth gap of the ratchet 22. The other end of the vertical rod 24 is located outside the shell 20, and a connecting block 25 is fixed on one end of the vertical rod 24 outside the shell 20. The ratchet 22 corresponding to the first rotating rod 11 is fixedly connected concentrically with the core axis of the first rotating rod 11, and the ratchet 22 corresponding to the second rotating rod 14 is fixedly connected concentrically with the core axis of the second rotating rod 14.

[0032] A cam rod 29 is arranged between the connecting block 25 and the mounting frame 6 on one side thereof, and the shaft rod 27 of the cam rod 29 is rotatably connected to the ear plate 26 fixed on the mounting frame 6, and a screw block 28 is fixed on the shaft rod 27 of the cam rod 29. When the cam rod 29 is rotated by the screw block 28 and the shaft rod 27, the cam rod 29 can drive the block 23 away from the ratchet 22 through the connecting block 25 and the vertical rod 24.

[0033] The other ends of the first rotating rod 11 and the second rotating rod 14 are both rotatably connected to a driving block 17, and the driving block 17 is connected to a position adjustment assembly. The position adjustment assembly includes a screw rod 16, the length direction of the screw rod 16 is parallel to the length direction of the mounting frame 6, the screw rod 16 is fixedly connected to the mounting frame 6, the screw rod 16 passes through the driving block 17 on one side thereof, the driving block 17 is slidably connected to the screw rod 16, and a screw sleeve 19 concentric with the screw rod 16 is rotatably connected to the driving block 17, and the screw sleeve 19 is threadedly connected to the screw rod 16.

[0034] The rotating disk 31 is provided with a gravity center adjustment assembly. The gravity center adjustment assembly includes a fixed ring 32, which is fixedly connected to the rotating disk 31 concentrically, a connecting plate 33 is fixedly connected to the fixed ring 32 concentrically, a motor 38 is eccentrically fixed to the connecting plate 33, a balancing block 39 is eccentrically fixed to the connecting plate 33, and the balancing block 39 is arranged opposite to the motor 38 and used to balance the weight of the motor 38. A rotating wheel 10 is eccentrically fixed to the output shaft of the motor 38, a rotating ring 9 is concentrically fixed to the rotating wheel 10, a plurality of sliding rods 35 are evenly distributed and slidably arranged on the fixed ring 32, the axial direction of the sliding rod 35 is parallel to the radial direction of the fixed ring 32, a counterweight 36 is fixed to one end of the sliding rod 35 away from the rotating ring 9, a top block 34 is fixed to one end of the sliding rod 35 facing the rotating ring 9, the top block 34 is in sliding contact with the outer edge of the rotating ring 9, and a second spring 37 is sleeved on the sliding rod 35 between the top block 34 and the fixed ring 32.

[0035] When clamping the steel structure, the steel structure is placed between the two mounting frames 6, and then the screw sleeve 19 is rotated, and then the distance between the adjacent first rotating rods 11 and the second rotating rods 14 is adjusted by the driving block 17. When the adjacent first rotating rods 11 and the second rotating rods 14 are close to each other, the arc-shaped elastic steel belt 8 between the adjacent first rotating rods 11 and the second rotating rods 14 protrudes toward the steel structure, thereby being able to squeeze and clamp the steel structure.

[0036] When the clamping position of the steel structure needs to be adjusted, the adjacent first rotating rod 11 and the second rotating rod 14 are moved to the same side, thereby adjusting the position of the elastic steel belt 8 between the adjacent first rotating rod 11 and the second rotating rod 14, and then the screw sleeve 19 is rotated, and then the distance between the adjacent first rotating rod 11 and the second rotating rod 14 is adjusted through the driving block 17, so that the elastic steel belt 8 part between the adjacent first rotating rod 11 and the second rotating rod 14 squeezes and clamps the steel structure.

[0037] When clamping the steel structure, if it is necessary to reduce the curvature of the elastic steel band 8 between the adjacent first rotating rod 11 and the second rotating rod 14 so as to offset the blocking part on the steel structure, the first rotating rod 11 or the second rotating rod 14 can be rotated by turning the handle 18, so as to reduce the space inside the elastic steel band 8 between the adjacent first rotating rod 11 and the second rotating rod 14, and finally achieve the elastic steel band 8 between the adjacent first rotating rod 11 and the second rotating rod 14 offsetting the blocking part on the steel structure, ensuring that the elastic steel band 8 between the adjacent first rotating rod 11 and the second rotating rod 14 can effectively contact the steel structure. When the first rotating rod 11 or the second rotating rod 14 rotates, the ratchet 22 rotates accordingly, and under the cooperation of the clamping block 23, the ratchet 22, the housing 20 and the vertical rod 24, the clamping block 23 can prevent the ratchet 22 from rotating, and can ensure the state of the elastic steel band 8.

[0038] The shaft rod 27 and the cam rod 29 are rotated by the screw block 28. When the cam rod 29 rotates, the vertical rod 24 and the block 23 can move upward through the connecting block 25. After the block 23 moves upward, the ratchet 22 can be released. After the ratchet 22 is released, the first rotating rod 11 and the second rotating rod 14 can rotate, so that the elastic steel belt 8 can be restored.

[0039] After the steel structure is clamped, when it is necessary to rotate the steel structure to adjust the welding angle, the steel structure, the mounting frame 6, the arc plate 5, the connecting rod 4 and the turntable 31 are rotated. When the welding angle of the steel structure is adjusted, the motor 38 is started. The motor 38 drives the rotating wheel 10 and the rotating ring 9 to rotate eccentrically in the fixed ring 32. During the eccentric rotation of the rotating ring 9, the counterweight 36 can be driven to move toward the outside of the fixed ring 32 through the top block 34 and the slide bar 35. During the rotation of the rotating ring 9, multiple counterweights 36 move toward the outside of the fixed ring 32 in sequence. When the eccentrically rotating rotating ring 9 causes the counterweight 36 on the side away from the steel structure to move toward the outside of the fixed ring 32, the counterweight 36 on the side away from the steel structure can balance the weight of the steel structure, thereby facilitating the positioning of the turntable 31.

[0040] By means of the circumferentially arranged multiple counterweights 36, when the heterogeneous steel structure is clamped, it is convenient to select a suitable counterweight 36 to protrude outwardly from the fixing ring 32, thereby balancing the weight of the heterogeneous steel structure and improving the application range of the device.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device for steel structure construction, comprising a base (1), wherein the upper end of the base (1) is rotatably connected to two arc-shaped plates (5), and the two arc-shaped plates (5) are symmetrically arranged on the left and right, characterized in that: The ends of the two arc-shaped plates (5) are fixedly connected by two mounting frames (6), the steel structure to be welded is located between the two mounting frames (6), a plurality of clamping assemblies are arranged in an array along the length direction of the mounting frame (6), a turntable (31) is concentrically fixed on the arc-shaped plate (5), and a center of gravity adjustment assembly is arranged on the turntable (31); the clamping assembly comprises two first rotating rods (11) slidably arranged in the mounting frame (6), two second rotating rods (14) are slidably arranged in the mounting frame (6) between the two first rotating rods (11), the sliding directions of the first rotating rod (11) and the second rotating rod (14) in the mounting frame (6) are parallel, the first rotating rod (11) and the second rotating rod (14) are parallel, the first rotating rod (11) and the second rotating rod (14) can rotate independently, a limiting frame (7) is fixed on the fixed frame between the two second rotating rods (14), and an elastic steel belt (8) is arranged. A through groove runs through the first rotating rod (11), the second rotating rod (14) and the limiting frame (7); the first rotating rod (11) and the second rotating rod (14) are both threadedly connected with a fastener (12) that is tightly against the elastic steel belt (8); the elastic steel belt (8) between the first rotating rod (11) and its adjacent second rotating rod (14) is partially arc-shaped and protrudes in the direction of the steel structure; the elastic steel belt (8) between the two second rotating rods (14) is partially arc-shaped and protrudes in the direction away from the steel structure; one end of the first rotating rod (11) and the second rotating rod (14) are both provided with a rotation limiting assembly; the rotation limiting assembly is slidably connected to the mounting frame (6); the sliding direction of the rotation limiting assembly is parallel to the sliding direction of the first rotating rod (11); the other ends of the first rotating rod (11) and the second rotating rod (14) are both rotatably connected with a driving block (17); the driving block (17) is connected to the position adjustment assembly.

2. A welding device for steel structure construction according to claim 1, characterized in that: A first slide groove (13) is provided in the mounting frame (6) on both sides of the first rotating rod (11), and the core shaft of the first rotating rod (11) passes through the first slide groove (13). A second slide groove (15) is provided in the mounting frame (6) on both sides of the second rotating rod (14), and the core shaft of the second rotating rod (14) passes through the second slide groove (15). The length direction of the first slide groove (13) and the second slide groove (15) is parallel to the length direction of the mounting frame (6), and a turning handle (18) is fixed on the core shaft of the first rotating rod (11) and the second rotating rod (14).

3. A welding device for steel structure construction according to claim 1, characterized in that: The rotation limiting assembly comprises a housing (20), convex ridges (21) are fixed on the mounting frames (6) on the upper and lower sides of the housing (20), the housing (20) is slidably arranged between the two convex ridges (21), a ratchet (22) is rotatably arranged in the housing (20), a vertical rod (24) is slidably arranged on the housing (20) on one side of the ratchet (22), the vertical rod (24) is connected to the housing (20) via a first spring (30), one end of the vertical rod (24) is located in the housing (20), and the housing (20) A clamping block (23) is fixed to one end of the vertical rod (24) inside the housing, and the clamping block (23) is inserted into a tooth gap of the ratchet wheel (22). The other end of the vertical rod (24) is located outside the housing (20). A connecting block (25) is fixed to one end of the vertical rod (24) outside the housing (20). The ratchet wheel (22) corresponding to the first rotating rod (11) is fixedly connected to the core shaft of the first rotating rod (11) concentrically, and the ratchet wheel (22) corresponding to the second rotating rod (14) is fixedly connected to the core shaft of the second rotating rod (14) concentrically.

4. A welding device for steel structure construction according to claim 3, characterized in that: A cam rod (29) is arranged between the connecting block (25) and the mounting frame (6) on one side thereof; the shaft rod (27) of the cam rod (29) is rotatably connected to an ear plate (26) fixed on the mounting frame (6); a screw block (28) is fixed on the shaft rod (27) of the cam rod (29); when the cam rod (29) is rotated by the screw block (28) and the shaft rod (27), the cam rod (29) can drive the clamping block (23) away from the ratchet wheel (22) through the connecting block (25) and the vertical rod (24).

5. A welding device for steel structure construction according to claim 1, characterized in that: The position adjustment component comprises a screw rod (16), the length direction of the screw rod (16) is parallel to the length direction of the mounting frame (6), the screw rod (16) is fixedly connected to the mounting frame (6), the screw rod (16) passes through a driving block (17) on one side thereof, the driving block (17) is slidably connected to the screw rod (16), a screw sleeve (19) concentric with the screw rod (16) is rotatably connected to the driving block (17), and the screw sleeve (19) is threadedly connected to the screw rod (16).

6. A welding device for steel structure construction according to claim 1, characterized in that: The center of gravity adjustment component comprises a fixed ring (32), the fixed ring (32) is fixedly connected concentrically with the rotating disk (31), a connecting plate (33) is fixedly connected concentrically with the fixed ring (32), a motor (38) is eccentrically fixed on the connecting plate (33), a rotating wheel (10) is eccentrically fixed on the output shaft of the motor (38), a rotating ring (9) is fixedly concentrically on the rotating wheel (10), a plurality of sliding rods (35) are evenly distributed and slidably arranged on the fixed ring (32), the axial direction of the sliding rods (35) is parallel to the radial direction of the fixed ring (32), a counterweight (36) is fixed to one end of the sliding rod (35) away from the rotating ring (9), a top block (34) is fixed to one end of the sliding rod (35) facing the rotating ring (9), the top block (34) is in sliding contact with the outer edge of the rotating ring (9), and a second spring (37) is sleeved on the sliding rod (35) between the top block (34) and the fixed ring (32).

7. A welding device for steel structure construction according to claim 6, characterized in that: A balancing block (39) is eccentrically fixed on the connecting plate (33); the balancing block (39) is arranged opposite to the motor (38) and is used to balance the weight of the motor (38).

8. A welding device for steel structure construction according to claim 1, characterized in that: A rotating shaft (3) is coaxially fixed on the rotating disk (31), the rotating shaft (3) is rotatably connected to the support rod (2), the rotating shaft (3) is fixedly connected to the arc plate (5) via a plurality of connecting rods (4), and the support rod (2) is fixedly connected to the base (1).

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