Intelligent welding platform for coil pipe machining

Abstract

The invention discloses an intelligent welding platform for coil pipe machining, and relates to the technical field of coil pipe welding, the intelligent welding platform comprises a placing frame and a pushing seat fixedly arranged in the placing frame, a pushing block is slidably connected in the pushing seat, a connecting rod is connected to the lower surface of the pushing block, and a welding assembly is arranged at the lower end of the connecting rod; a transmission assembly is arranged at one end of the pushing block, and clamping assemblies are arranged on the surfaces of the two sides of the pushing block. According to the intelligent welding platform for coil pipe machining, the pushing block is arranged to move so as to drive the clamping assembly to clamp and stabilize the welded pipe, the transmission assembly is synchronously driven to move, then the welding assembly is driven to weld the seam of the welded pipe and the coil pipe, and after welding is finished, the welding assembly is driven to weld the seam of the welded pipe and the coil pipe. The block continues to be pushed so that the clamping assembly unlocks the welded pipe.

Description

Technical Field

[0001] The invention relates to the technical field of coil pipe welding, and in particular to an intelligent welding platform for coil pipe processing. Background Art

[0002] Coil is a common heat exchange element, widely used in refrigeration, air conditioning, chemical industry, petroleum and other fields. It is usually made of metal tubes (such as copper tubes, steel tubes) bent into a spiral or serpentine shape to transfer heat. Parallel coil is a common heat exchanger structure, which consists of multiple coils in parallel.

[0003] The welding and transportation of parallel coils are key links in the manufacturing and installation process, involving welding technology, transportation system design and quality control. Commonly used welding methods include brazing, tungsten inert gas shielded welding, high-frequency induction welding and laser welding. Among them, laser welding is a more common welding method. It is very suitable for high-precision welding, and the weld is beautiful with almost no heat-affected zone.

[0004] When welding coils under the existing technology, due to their spiral shape characteristics, there are not many transportation and docking methods that can be selected during welding. The most convenient and efficient docking method is to perform circumferential welding after docking with the welded pipe. In this docking process, due to the extrusion generated during docking, the welded pipe is prone to misalignment, so it is very important to fix the welded pipe. However, due to the shape characteristics of the coil, it becomes a problem to remove the coil after welding. Therefore, overcoming this technical difficulty to enable smooth production of the production line is an urgent problem to be solved. Summary of the invention

[0005] The object of the present invention is to provide an intelligent welding platform for coil processing to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An intelligent welding platform for coil processing, comprising a placement frame and a propulsion seat fixedly arranged inside the placement frame, a propulsion block slidably connected inside the propulsion seat, a connecting rod connected to the lower surface of the propulsion block, a welding assembly provided at the lower end of the connecting rod, a transmission assembly provided at one end of the propulsion block, and clamping assemblies provided on both sides of the propulsion block;

[0008] When welding is in progress, the welding pipe is placed on the placement frame, and when the coil is conveyed and pushed in, it contacts the welding pipe and pushes the welding pipe forward, thereby pushing the pushing block to move, so as to drive the clamping assembly to clamp the welding pipe firmly, and synchronously drive the transmission assembly to move, thereby driving the welding assembly to weld the joint between the welding pipe and the coil. After welding is completed, continue to push the pushing block to allow the clamping assembly to unlock the welding pipe.

[0009] As a further preferred scheme in the embodiment of the present invention, it also includes a connecting rod, the upper end of the connecting rod is fixedly connected to the lower surface of the placement frame, the lower part of the propulsion seat is provided with a hollow groove, the lower part of the placement frame is provided with a sliding groove, the hollow groove is adapted to the position of the sliding groove, the connecting rod is slidably matched with the hollow groove and the sliding groove, the upper part of the connecting rod is provided with a first connecting groove, and a connecting strip is slidably connected in the first connecting groove, and one end of the connecting strip is fixedly connected to the lower end of the connecting rod.

[0010] As a further preferred scheme in the embodiment of the present invention, the welding assembly includes a connecting ring fixedly connected to the other end of the connecting strip, and one end of the connecting ring is rotatably connected to a gear ring, and the upper part of one end of the gear ring is rotatably connected to a material picking rack, and the lower part of the other end of the gear ring is fixedly connected to a fixing strip, and one end of the fixing strip is provided with a laser welder, and the upper part of the connecting ring is provided with a material picking trough, and the upper part of the gear ring is also fixedly connected to a limiting block.

[0011] As a further preferred scheme in the embodiment of the present invention, a convergence groove is provided on one side of the propulsion seat, a convergence seat is fixedly connected to the same side of the propulsion seat, the convergence seat is arranged below the convergence groove, a travel groove is provided on the upper surface of the convergence seat, and a convergence block is slidably connected in the travel groove.

[0012] As a further preferred scheme in the embodiment of the present invention, the clamping assembly includes a gathering strip rotatably connected to one side of the propulsion block, and one end of the gathering strip is rotatably connected to the upper surface of the gathering block, and a gathering rod is rotatably connected to the upper surface of the same end of the gathering strip, and a clamping strip is hinged at one end of the gathering rod, and a clamping plate is connected to the inner side of the clamping strip.

[0013] As a further preferred scheme in the embodiment of the present invention, one end of the placement frame is connected to a mounting seat, the transmission assembly includes a propulsion rod fixedly connected to one end of the propulsion block, and one end of the mounting seat is rotatably connected to an outer tube, and the propulsion rod is slidably sleeved inside the outer tube, and a conversion groove is provided on the surface of the outer tube, and a conversion block is fixedly connected to the surface of the propulsion rod, and the conversion block slides in cooperation with the conversion groove.

[0014] As a further preferred scheme in the embodiment of the present invention, the transmission assembly also includes a transmission tube rotatably connected to the other end of the mounting seat, and one end of the transmission tube passes through the mounting seat and is connected to the outer tube, and the surface of the transmission tube is rotatably connected to a transmission belt, and one end of the transmission belt is rotatably connected to a transmission wheel.

[0015] As a further preferred solution in the embodiment of the present invention, a fixing block is fixedly connected to the lower surface of the other end of the connecting strip, and a connecting arc is fixedly connected to the lower end of the fixing block.

[0016] As a further preferred scheme in the embodiment of the present invention, the welding assembly also includes two driving wheels rotatably connected at both ends of the connecting arc, and a driving belt is rotatably connected between the two driving wheels, and one end of the two driving wheels is respectively connected to two driving gears, and the two driving gears are meshed with the gear ring, and one end of the transmission wheel is connected to a driving rod, and one end of the driving rod passes through one end of the connecting arc and is connected to one of the driving wheels.

[0017] In the above technical solution, the intelligent welding platform for coil processing provided by the present invention has the beneficial effects of:

[0018] The present invention arranges a pushing block to move to drive the clamping assembly to clamp the welded pipe firmly, and synchronously drives the transmission assembly to move, thereby driving the welding assembly to weld the joint between the welded pipe and the coil. After the welding is completed, the pushing block continues to enable the clamping assembly to unlock the welded pipe.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0020] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a local structure provided by an embodiment of the present invention;

[0024] Figure 3 The embodiment of the present invention provides Figure 2A schematic diagram of the partially enlarged structure at center A;

[0025] Figure 4 The embodiment of the present invention provides Figure 2 A schematic diagram of the partially enlarged structure at B in the middle;

[0026] Figure 5 A schematic diagram of a local structure from another perspective provided by an embodiment of the present invention;

[0027] Figure 6 The embodiment of the present invention provides Figure 5 A schematic diagram of the partially enlarged structure at C in the middle;

[0028] Figure 7 The embodiment of the present invention provides Figure 5 The schematic diagram of the local enlarged structure at D in the middle;

[0029] Figure 8 A schematic diagram of the structure of a placement frame provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Conveyor; 101. Pipe placing frame; 102. Limiting groove; 2. Connecting frame; 201. Connecting rod; 202. First connecting groove; 203. Placing frame; 204. Sliding groove; 205. Clamping groove; 206. Connecting rod; 3. Connecting strip; 301. Connecting ring; 302. Gear ring; 303. Material taking trough; 304. Limiting block; 305. Material taking rack; 306. Fixing strip; 307. Laser welder; 4. Driving gear; 401. Driving wheel; 402. Driving belt; 403. Connecting arc; 404, fixing block; 405, driving rod; 406, connecting seat; 407, transmission wheel; 5, pushing seat; 501, gathering groove; 502, pushing block; 503, gathering seat; 504, travel groove; 505, gathering block; 506, gathering strip; 507, clamping strip; 508, reset spring; 509, gathering rod; 510, clamping plate; 6, pushing rod; 601, conversion block; 602, outer tube; 603, conversion groove; 604, mounting seat; 605, transmission tube; 606, transmission belt. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] See also Figure 1 - Figure 8 , an intelligent welding platform for coil processing, comprising a placement frame 203 and a propulsion seat 5 fixedly arranged inside the placement frame 203, a propulsion block 502 is slidably connected inside the propulsion seat 5, a connecting rod 206 is connected to the lower surface of the propulsion block 502, a welding assembly is arranged at the lower end of the connecting rod 206, a transmission assembly is arranged at one end of the propulsion block 502, and clamping assemblies are arranged on both sides of the propulsion block 502;

[0034] When welding is in progress, the welding pipe is placed on the placement frame 203, and when the coil is conveyed and pushed in, it contacts the welding pipe and pushes the welding pipe forward, thereby pushing the pushing block 502 to move, so as to drive the clamping assembly to clamp the welding pipe firmly, and synchronously drive the transmission assembly to move, thereby driving the welding assembly to weld the joint between the welding pipe and the coil. After welding is completed, continue to push the block 502 to allow the clamping assembly to unlock the welding pipe.

[0035] The present invention sets a pushing block 502 to move to drive the clamping assembly to clamp the welded pipe firmly, and synchronously drives the transmission assembly to move, thereby driving the welding assembly to weld the joint between the welded pipe and the coil. After welding, the pushing block 502 is continued to enable the clamping assembly to unlock the welded pipe.

[0036] In the embodiment further provided by the present invention, it also includes a connecting rod 201, the upper end of the connecting rod 201 is fixedly connected to the lower surface of the placement frame 203, a hollow groove is provided at the lower part of the pushing seat 5, and a sliding groove 204 is provided at the lower part of the placement frame 203. The position of the hollow groove is adapted to the sliding groove 204, and the connecting rod 206 is slidably matched with the hollow groove and the sliding groove 204. A first connecting groove 202 is provided at the upper part of the connecting rod 201, and a connecting strip 3 is slidably connected in the first connecting groove 202, and one end of the connecting strip 3 is fixedly connected to the lower end of the connecting rod 206.

[0037] In an embodiment further provided by the present invention, the welding assembly includes a connecting ring 301 fixedly connected to the other end of the connecting strip 3, and one end of the connecting ring 301 is rotatably connected to a gear ring 302, and the upper part of one end of the gear ring 302 is rotatably connected to a material picking rack 305, and the lower part of the other end of the gear ring 302 is fixedly connected to a fixing strip 306, and one end of the fixing strip 306 is provided with a laser welder 307, and the upper part of the connecting ring 301 is provided with a material picking groove 303, and the upper part of the gear ring 302 is also fixedly connected to a limiting block 304.

[0038] Furthermore, a matching groove is provided on the upper portion of the gear ring 302 , and the size and opening direction of the matching groove are consistent with those of the material taking groove 303 .

[0039] Furthermore, the limit block 304 is arranged below the material taking rack 305 to limit the rotation direction of the material taking rack 305 so that the material taking rack 305 can only be rotated upward to open.

[0040] Specifically, the tooth spacing of the material taking rack 305 is consistent with the tooth spacing of the gear ring 302, so that when the material taking rack 305 is not opened, it can cooperate with the gear ring 302 to form a complete gear ring.

[0041] Furthermore, an infrared sensor according to the prior art is provided on the laser welder 307 so that the laser welder 307 can be started and stopped automatically.

[0042] In an embodiment further provided by the present invention, a focusing groove 501 is provided on one side of the propulsion seat 5, and a focusing seat 503 is fixedly connected to the same side of the propulsion seat 5. The focusing seat 503 is arranged below the focusing groove 501, and a travel groove 504 is provided on the upper surface of the focusing seat 503, and a focusing block 505 is slidably connected in the travel groove 504.

[0043] In an embodiment further provided by the present invention, the clamping assembly includes a tightening strip 506 rotatably connected to one side of the propulsion block 502, and one end of the tightening strip 506 is rotatably connected to the upper surface of the tightening block 505, and a tightening rod 509 is rotatably connected to the upper surface of the same end of the tightening strip 506, and a clamping strip 507 is hinged at one end of the tightening rod 509, and a clamping plate 510 is connected to the inner side of the clamping strip 507.

[0044] Furthermore, a clamping groove 205 is provided on the upper surface of the placement frame 203, and the clamping plate 510 is adapted to the position of the clamping groove 205. The clamping plate 510 is located in the middle of the left and right sides of the welding pipe, and the clamping plate 510 is a fan-shaped structure smaller than the welding pipe, so that the clamping plate 510 can clamp the welding pipe, and the clamping plate 510 does not affect the upward pulling and removal of the welding pipe after it is opened.

[0045] Furthermore, the initial position of the propulsion block 502 is on the right side of the propulsion seat 5, and it is pushed to the left when being pushed. When the propulsion block 502 is in the initial position, the convergence block 505 is at the innermost side of the travel groove 504, and the deflection angle of the convergence strip 506 is to the right. At this time, the clamping plate 510 is in an open state.

[0046] Specifically, when the pushing block 502 is pushed, it has two strokes. The first stroke: after the pushing block 502 is pushed, it drives the converging strip 506 to deflect to the left to be perpendicular to the pushing seat 5, thereby driving the converging block 505 to slide outward to the outermost side, and then the converging rod 509 drives the clamping strip 507 to rotate, so that the clamping plate 510 clamps and fixes the welded pipe; the second stroke: after the welding is completed, the coil continues to be transported forward for a distance, so that the pushing block 502 moves to the left side of the pushing seat 5, so that the converging block 505 is driven to slide inward, so that the clamping plate 510 opens and no longer clamps and fixes the welded pipe.

[0047] In an embodiment further provided by the present invention, one end of the placement frame 203 is connected to a mounting seat 604, the transmission assembly includes a propulsion rod 6 fixedly connected to one end of the propulsion block 502, and one end of the mounting seat 604 is rotatably connected to an outer tube 602, and the propulsion rod 6 is slidably sleeved inside the outer tube 602, and a conversion groove 603 is provided on the surface of the outer tube 602, and a conversion block 601 is fixedly connected to the surface of the propulsion rod 6, and the conversion block 601 slides in cooperation with the conversion groove 603.

[0048] Furthermore, a reset spring 508 is provided outside the push rod 6, and the reset spring 508 is connected between the outer tube 602 and the push block 502. The reset spring 508 is used to reset the clamping mechanism after the coil is taken out after welding.

[0049] Furthermore, the shape of the conversion groove 603 is spiral, and the number of turns and the slope of the turns are determined according to the transmission ratio required for welding.

[0050] In an embodiment further provided by the present invention, the transmission assembly also includes a transmission tube 605 rotatably connected to the other end of the mounting seat 604, and one end of the transmission tube 605 passes through the mounting seat 604 and is connected to the outer tube 602, and the surface of the transmission tube 605 is rotatably connected to a transmission belt 606, and one end of the transmission belt 606 is rotatably connected to a transmission wheel 407.

[0051] In an embodiment further provided by the present invention, a fixing block 404 is fixedly connected to the lower surface of the other end of the connecting strip 3 , and a connecting arc 403 is fixedly connected to the lower end of the fixing block 404 .

[0052] In an embodiment further provided by the present invention, the welding assembly also includes two driving wheels 401 rotatably connected at both ends of the connecting arc 403, and a driving belt 402 is rotatably connected between the two driving wheels 401, and one end of the two driving wheels 401 is respectively connected to two driving gears 4, and the two driving gears 4 are both engaged with the gear ring 302, and one end of the transmission wheel 407 is connected to a driving rod 405, and one end of the driving rod 405 passes through one end of the connecting arc 403 and is connected to one of the driving wheels 401.

[0053] Furthermore, a connecting seat 406 is fixedly connected to the surface of one side of the connecting rod 201, and the driving rod 405 is rotatably connected inside the connecting seat 406, and the connecting seat 406 is arranged in the middle of the driving rod 405. More supporting devices can be arranged at both ends of the connecting rod 201 as required to improve the stability during transmission.

[0054] Furthermore, the transmission belt 606 can also be replaced with a gear set structure to increase the transmission ratio during transmission, thereby increasing the rotation stroke of the driving gear 4 to better drive the gear ring 302 to rotate for welding. This is common knowledge among technicians in this field and will not be elaborated on.

[0055] Specifically, the lower end of the connecting rod 201 is fixedly connected to the connecting frame 2, one end of the connecting frame 2 is connected to the conveyor 1, a pipe placing frame 101 is provided on the surface of the conveyor 1, and a limiting groove 102 is provided on the upper surface of the pipe placing frame 101.

[0056] Furthermore, the coiled tube is placed in the tube placement frame 101, and the extended straight tube portion thereof is clamped by the limiting groove 102 and extended to be welded.

[0057] In the present invention, the staff first places the coil in the tube placement frame 101, and clamps its straight tube part on the limiting groove 102, then places the welded tube on the right side of the push block 502 on the placement frame 203, and then starts the conveyor 1 to transport the coil forward, so that the straight tube part of the coil is connected with the welded tube, and continues to be transported forward for a distance, so that the push block 502 is pushed and drives the convergence bar 506 to deflect to the left to be perpendicular to the push seat 5, thereby driving the convergence block 505 to slide outward to the outermost side, and then the convergence rod 509 drives the clamping bar 507 to rotate, so that the clamping plate 510 clamps and fixes the welded tube; when the push block 502 is pushed, it synchronously drives the push rod 6 to slide in the outer tube 602, so that the conversion block 601 is in the conversion groove 603. The outer tube 602 slides upward, and under the action of the conversion groove 603, the horizontal movement of the outer tube 602 is converted into a rotational movement, thereby driving the transmission belt 606 to move, thereby driving the driving rod 405 to rotate, so as to drive the driving gear 4 to rotate, and then driving the gear ring 302 to rotate on the connecting ring 301, so that the laser welder 307 rotates one circle along the joint between the straight tube part of the coil and the welding tube to weld; after the welding is completed, the laser welder 307 is turned off, and the coil is continuously conveyed forward for a distance, so that the pushing block 502 moves to the left side of the pushing seat 5, so that the convergence block 505 is driven to slide inward, so that the clamping plate 510 is opened and no longer clamps and fixes the welding tube, and then the welded coil is pulled upward, and the material removal rack 305 is pushed open to take out the coil.

[0058] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An intelligent welding platform for coil processing, comprising a placement frame (203) and a propulsion seat (5) fixedly arranged inside the placement frame (203), characterized in that: A propulsion block (502) is slidably connected inside the propulsion seat (5), a connecting rod (206) is connected to the lower surface of the propulsion block (502), a welding assembly is provided at the lower end of the connecting rod (206), a transmission assembly is provided at one end of the propulsion block (502), and clamping assemblies are provided on both side surfaces of the propulsion block (502); When welding is in progress, the welding pipe is placed on the placement frame (203), and when the coil is conveyed and pushed in, it contacts the welding pipe and pushes the welding pipe forward, thereby pushing the pushing block (502) to move, so as to drive the clamping assembly to clamp the welding pipe firmly, and synchronously drive the transmission assembly to move, thereby driving the welding assembly to weld the joint between the welding pipe and the coil. After welding is completed, the pushing block (502) continues to be pushed forward so that the clamping assembly unlocks the welding pipe.

2. The intelligent welding platform for coil processing according to claim 1, characterized in that: It also includes a connecting rod (201), the upper end of which is fixedly connected to the lower surface of the placement frame (203), the lower part of the propulsion seat (5) is provided with a hollow groove, the lower part of the placement frame (203) is provided with a sliding groove (204), the position of the hollow groove is adapted to the sliding groove (204), the connecting rod (206) is slidably matched with the hollow groove and the sliding groove (204), the upper part of the connecting rod (201) is provided with a first connecting groove (202), a connecting strip (3) is slidably connected in the first connecting groove (202), and one end of the connecting strip (3) is fixedly connected to the lower end of the connecting rod (206).

3. The intelligent welding platform for coil processing according to claim 2 is characterized in that: The welding assembly comprises a connecting ring (301) fixedly connected to the other end of the connecting strip (3), and one end of the connecting ring (301) is rotatably connected to a toothed ring (302), and the upper part of one end of the toothed ring (302) is rotatably connected to a material taking rack (305), and the lower part of the other end of the toothed ring (302) is fixedly connected to a fixing strip (306), and one end of the fixing strip (306) is provided with a laser welder (307), and the upper part of the connecting ring (301) is provided with a material taking trough (303), and the upper part of the toothed ring (302) is also fixedly connected to a limiting block (304).

4. The intelligent welding platform for coil processing according to claim 3 is characterized in that: A convergence groove (501) is provided on one side of the propulsion seat (5), and a convergence seat (503) is fixedly connected to the same side of the propulsion seat (5). The convergence seat (503) is arranged below the convergence groove (501), and a travel groove (504) is provided on the upper surface of the convergence seat (503). A convergence block (505) is slidably connected in the travel groove (504).

5. The intelligent welding platform for coil processing according to claim 4 is characterized in that: The clamping assembly includes a tightening strip (506) rotatably connected to one side of the propulsion block (502), and one end of the tightening strip (506) is rotatably connected to the upper surface of the tightening block (505), and the upper surface of the same end of the tightening strip (506) is rotatably connected to a tightening rod (509), and one end of the tightening rod (509) is hinged with a clamping strip (507), and the inner side of the clamping strip (507) is connected to a clamping plate (510).

6. The intelligent welding platform for coil processing according to claim 5, characterized in that: One end of the placement frame (203) is connected to a mounting seat (604), and the transmission assembly includes a propulsion rod (6) fixedly connected to one end of the propulsion block (502), and one end of the mounting seat (604) is rotatably connected to an outer tube (602), and the propulsion rod (6) is slidably sleeved inside the outer tube (602), and a conversion groove (603) is provided on the surface of the outer tube (602), and a conversion block (601) is fixedly connected to the surface of the propulsion rod (6), and the conversion block (601) and the conversion groove (603) are slidably matched.

7. The intelligent welding platform for coil processing according to claim 6, characterized in that: The transmission assembly also includes a transmission tube (605) rotatably connected to the other end of the mounting seat (604), and one end of the transmission tube (605) passes through the mounting seat (604) and is connected to the outer tube (602), and the surface of the transmission tube (605) is rotatably connected to a transmission belt (606), and one end of the transmission belt (606) is rotatably connected to a transmission wheel (407).

8. The intelligent welding platform for coil processing according to claim 7, characterized in that: A fixing block (404) is fixedly connected to the lower surface of the other end of the connecting strip (3), and a connecting arc (403) is fixedly connected to the lower end of the fixing block (404).

9. The intelligent welding platform for coil processing according to claim 8, characterized in that: The welding assembly also includes two driving wheels (401) rotatably connected to the two ends of the connecting arc (403), and a driving belt (402) is rotatably connected between the two driving wheels (401), and one end of the two driving wheels (401) is respectively connected to two driving gears (4), and both of the two driving gears (4) are meshed with the gear ring (302), and one end of the transmission wheel (407) is connected to a driving rod (405), and one end of the driving rod (405) passes through one end of the connecting arc (403) and is connected to one of the driving wheels (401).

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