Oval tube fin welding device
By combining the support frame and the laser welding assembly, the problem of poor contact in the welding of elliptical tube fins was solved, ensuring the stability and precision of the welding, achieving the flatness and positional stability of the fins, and improving the welding effect.
Patent Information
- Application Number
- CN202511473475.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2025-12-16
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the existing elliptical tube fin welding process, it is difficult to make the elliptical surface of the elliptical tube fully contact the welding rod, which affects the welding effect.
The system employs a combination of components such as a support frame, laser welding assembly, linear motor, and elliptical placement frame to ensure that the elliptical tube and fins remain in contact throughout the welding process. Furthermore, it utilizes structures such as rolling rollers and contact plates to maintain the flatness and positional stability of the fins, preventing them from bending or shifting.
Stable welding of elliptical tubes and fins has been achieved, ensuring welding results, preventing fin bending or displacement, and improving welding accuracy and product quality.
Smart Images
Figure CN121132001A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of welding devices, in particular to an elliptical tube fin welding device. BACKGROUND
[0002] The elliptical tube fin is a structure commonly used in heat exchangers, radiators and other equipment, mainly used for improving the heat exchange efficiency. The design adopts an elliptical pipe shape, which has a larger surface area than a circular pipe, can effectively increase the contact area with air or liquid, and thus enhance the conduction and emission of heat. The elliptical tube fin can reduce resistance and optimize the flow path of the fluid in application, thereby improving the performance and working efficiency of the heat exchanger. Due to its special shape, the elliptical tube fin is widely used in high-performance radiators and cooling systems.
[0003] In the welding process of the existing elliptical tube fin, it is difficult to make the elliptical surface of the elliptical tube directly contact the welding rod, thereby easily affecting the welding effect of the elliptical tube fin, therefore, the application provides an elliptical tube fin welding device. SUMMARY
[0004] In view of the deficiencies of the prior art, the application provides an elliptical tube fin welding device, which solves the problems in the background art.
[0005] In order to achieve the above object, the present application is realized by the following technical scheme: an elliptical tube fin welding device, comprising a support frame, the side of the support frame is provided with a laser welding assembly for welding the elliptical tube and the fin, the side of the support frame is fixedly connected with a linear motor, the side of the support frame is penetrated and rotated with an elliptical placing frame, one end of the outer wall of the elliptical placing frame is fixedly connected with an elliptical block, the end of the outer wall of the elliptical placing frame away from the elliptical block is fixedly connected with a rotating wheel one, the side of the support frame is fixedly connected with a motor one, the output shaft of the motor one is fixedly connected with a rotating wheel two, the rotating wheel two and the rotating wheel one are transmission connected with a belt, the driving end of the linear motor is fixedly connected with an L-shaped support block, the inner wall of the L-shaped support block is slidingly connected with a sliding block, the sliding block and the L-shaped support block are provided with a spring, the side of the sliding block is fixedly connected with a connecting column, the side of the connecting column away from the sliding block is fixedly connected with a motor two, the output shaft of the motor two is fixedly connected with a thin rotating column, the outer wall of the thin rotating column is fixedly connected with a circular block, the outer wall of the thin rotating column is fixedly connected with a placing block, the elliptical tube needing to be welded with the fin is inserted into the inner wall of the elliptical placing frame, the elliptical placing frame supports the elliptical tube, then the strip material welded with the elliptical tube is wound on the outer wall of the placing block, then the motor one and the motor two are driven, the staff starts the motor one, the output shaft of the motor one makes the rotating wheel two rotate, the rotation of the rotating wheel two drives the rotating wheel one to rotate through the belt, the rotation of the rotating wheel one makes the elliptical tube rotate, at the same time, the rotation of the motor two drives the thin rotating column to rotate, the rotation of the thin rotating column drives the elliptical block to rotate, the rotation of the thin rotating column drives the placing block to rotate, the rotation of the placing block drives the strip material to rotate, then the contact points between the strip material and the elliptical tube are welded by the laser welding assembly, before welding, the fin strip is close to the outer wall of the rotating elliptical tube, then the elliptical tube and the fin strip are welded by the laser welding assembly, when the elliptical block rotates, the convex part of the elliptical block pushes the outer wall of the circular block and makes the circular block move downward, the downward movement of the circular block drives the thin rotating column to move downward, the downward movement of the thin rotating column drives the motor two to move downward, the downward movement of the motor two drives the connecting column to move downward, the downward movement of the connecting column drives the sliding block to move downward along the inner wall of the L-shaped support block, at the same time, the spring is compressed by the sliding block, when the convex part of the elliptical block is away from the outer wall of the circular block, the spring drives the sliding block to reset by the elastic force of itself, the reset of the sliding block drives the connecting column to reset, the reset of the connecting column drives the motor two to reset, the reset of the motor two drives the thin rotating column to reset, the reset of the thin rotating column drives the circular block to reset, so that the outer wall of the circular block is always in contact with the outer wall of the elliptical block, during the welding process of the elliptical tube and the welding rod, the elliptical tube is pulled by the external drag frame to move inside the elliptical placing frame.
[0006] According to the above technical scheme, the outer wall of the elliptical block is provided as a smooth surface, and the outer wall of the circular block is provided as a smooth surface.
[0007] According to the above technical scheme, the outer wall of the elliptical block is in contact with the outer wall of the circular block.
[0008] According to the above technical scheme, the side surface of the support frame is provided with a rough groove for moving the rough rotating column, and the bottom of the elliptical placing frame located at one side of the elliptical block is fixedly connected to the inner wall bottom of the L-shaped support block.
[0009] According to the above technical scheme, the outer wall of the connecting column is provided with a bending prevention device, the inner wall of the fixing ring is fixedly connected to the outer wall of the connecting column, the top of the fixing ring is fixedly connected with a support, the side surface of the support is fixedly connected with a fixed frame, two rotating rods are penetratingly and rotatably arranged at the bottom of the fixed frame, the top of each of the two rotating rods is fixedly connected with a rolling roller, when the fin strip is close to the outer wall of the rotating elliptical pipe, the fin strip is passed between the two rolling rollers before being welded by the laser welding assembly, and the two rolling rollers are rotated, so that the fin strip is rolled by the two rolling rollers during movement.
[0010] According to the above technical scheme, the outer wall of the connecting column is provided with a bending prevention device, the inner wall of the fixing ring is fixedly connected to the outer wall of the connecting column, the top of the fixing ring is fixedly connected with a support, the side surface of the support is fixedly connected with a fixed frame, two rotating rods are penetratingly and rotatably arranged at the bottom of the fixed frame, the top of each of the two rotating rods is fixedly connected with a rolling roller, when the fin strip is close to the outer wall of the rotating elliptical pipe, the fin strip is passed between the two rolling rollers before being welded by the laser welding assembly, and the two rolling rollers are rotated, so that the fin strip is rolled by the two rolling rollers during movement.
[0011] According to the above technical scheme, the outer wall of each of the two rolling rollers is provided with a long groove.
[0012] According to the above technical scheme, the bottom of the fixed frame is fixedly connected with two fixed blocks, the inner wall bottom of each of the two fixed blocks is fixedly connected with a long rod, the outer wall of the long rod is rotatably connected with a resisting plate, a torsion spring is arranged between the resisting plate and the fixed block, the resisting plate is tightly attached to the surface of the material through the elastic force of the torsion spring.
[0013] According to the above technical scheme, one side of the resisting plate is provided with a sawtooth shape, and the sawtooth of the sawtooth shape is provided with an arc shape.
[0014] According to the technical scheme, the inner wall of the support is provided with an anti-misalignment device, the anti-misalignment device comprises a triangular block, the bottom of the triangular block is fixedly connected to the inner wall of the support, the side surface of the triangular block is fixedly connected with a track block, the side surface of the track block is rotatably connected with an adjusting block, the side surface of the adjusting block is fixedly connected with a threaded rod, the outer wall of the threaded rod is threadedly connected with a threaded sleeve, the side surface of the threaded sleeve is fixedly connected with a connecting rod, the outer wall of the connecting rod is rotatably connected with a limiting roller, and the bottom and the top of the threaded sleeve are in contact with the inner wall of the track block.When the fin strip is in contact with the outer wall of the elliptical pipe, the adjusting block is rotated, the rotation of the adjusting block drives the threaded rod to rotate, the rotation of the threaded rod drives the threaded sleeve to move, the movement of the threaded sleeve drives the connecting rod to move, and the movement of the connecting rod drives the limiting roller to abut against the side surface of the material.
[0015] The application provides an elliptical pipe fin welding device. (1) The cooperation of the support frame, the laser welding assembly, the linear motor, the elliptical placing frame, the rotating wheel one, the motor one, the elliptical block, the rotating wheel two, the belt, the motor two, the fine rotating column, the circular block, the placing block, the connecting column, the sliding block, the L-shaped supporting block and the spring enables the motor two to drive the fine rotating column to reset, and the resetting of the fine rotating column drives the circular block to reset, so that the outer wall of the circular block is always in contact with the outer wall of the elliptical block, the elliptical pipe is pulled by the external drag frame during the welding of the elliptical pipe and the fin (the material), the elliptical pipe moves inside the elliptical placing frame, so that the outer wall of the elliptical pipe is always in contact with the outer wall of the material, and the welding effect of the elliptical pipe is ensured.
[0016] (2) The cooperation of the rotating rod and the rolling roller enables the fin strip to pass between the two rolling rollers and simultaneously enables the two rolling rollers to rotate, the rolling rollers can roll the surface of the material during the movement of the fin strip, so that the fin strip is kept flat, the fin strip is prevented from being bent or raised, the precision of the subsequent process is ensured, and product defects are avoided; the cooperation of the rolling roller and the one-way bearing enables the one-way bearing to limit the rotating direction of the rolling roller, the rolling roller can form a tensile resistance on the material when the material is subjected to a pulling force, so that the material is prevented from being difficult to be stably welded with the elliptical pipe due to the pulling force; the cooperation of the abutting plate and the torsional spring enables the abutting plate to be tightly attached to the surface of the material by the elastic force of the torsional spring, the sawtooth part of the abutting plate can clean the impurities on the surface of the material, so that the impurities on the surface of the material are prevented from affecting the welding effect of the material and the elliptical pipe.
[0017] (3) The adjusting block, threaded rod, threaded sleeve, connecting rod and limiting roller are matched, the movement of the connecting rod drives the limiting roller to abut against the side of the strip, thereby limiting the position of the strip, ensuring that the strip is in the same horizontal plane when being welded around the outer wall of the elliptical pipe, thereby avoiding the problem that the strip is offset when being welded around the outer wall of the elliptical pipe due to external force. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a schematic view of the whole application; Figure 2 It is a schematic view of a structure of the motor; Figure 3 It is a schematic view of a structure of the round block; Figure 4 It is a schematic view of a structure of the fixed ring; Figure 5 It is a schematic view of a structure of the abutting plate; Figure 6 It is a schematic view of a local structure of the bending prevention device; Figure 7 It is a schematic view of a local structure of the misplacement prevention device; Figure 8 It is a schematic view of a structure of the motor; Figure 8 It is a schematic view of a structure of the motor.
[0019] In the figure: 1, support frame; 2, laser welding assembly; 3, linear motor; 4, elliptical placing frame; 5, rotating wheel one; 6, motor one; 7, elliptical block; 8, bending prevention device; 81, fixed ring; 82, support; 83, fixed frame; 84, rotating rod; 85, rolling roller; 86, one-way bearing; 87, fixed block; 88, long rod; 89, abutting plate; 810, torsional spring; 9, misplacement prevention device; 91, triangular block; 92, track block; 93, adjusting block; 94, threaded rod; 95, threaded sleeve; 96, connecting rod; 97, limiting roller; 10, rotating wheel two; 11, belt; 12, motor two; 13, thin rotating column; 14, round block; 15, placing block; 16, connecting column; 17, sliding block; 18, L-shaped support block; 19, spring. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments of the application.
[0021] Please refer to Figures 1-8One embodiment of the present application is: an elliptical tube fin welding device, comprising a support frame 1, the side of the support frame 1 is provided with a laser welding assembly 2 for welding the elliptical tube and the fin, the side of the support frame 1 is fixedly connected with a linear motor 3, the side of the support frame 1 is penetrated and rotated with an elliptical placing frame 4, one end of the outer wall of the elliptical placing frame 4 is fixedly connected with an elliptical block 7, the end of the outer wall of the elliptical placing frame 4 away from the elliptical block 7 is fixedly connected with a rotating wheel one 5, the side of the support frame 1 is fixedly connected with a motor one 6, the output shaft of the motor one 6 is fixedly connected with a rotating wheel two 10, the rotating wheel two 10 and the rotating wheel one 5 are transmission connected with a belt 11, the driving end of the linear motor 3 is fixedly connected with an L-shaped support block 18, the inner wall of the L-shaped support block 18 is slidingly connected with a sliding block 17, the sliding block 17 and the L-shaped support block 18 are provided with a spring 19, the side of the sliding block 17 is fixedly connected with a connecting column 16, the side of the connecting column 16 away from the sliding block 17 is fixedly connected with a motor two 12, the output shaft of the motor two 12 is fixedly connected with a thin rotating column 13, the outer wall of the thin rotating column 13 is fixedly connected with a circular block 14, the outer wall of the thin rotating column 13 is fixedly connected with a placing block 15, the outer wall of the elliptical block 7 is provided as a smooth surface, the outer wall of the circular block 14 is provided as a smooth surface, the outer wall of the elliptical block 7 is in contact with the outer wall of the circular block 14, through the setting of the above structure, the elliptical tube is pulled by the external drag frame during the process of welding the elliptical tube and the fin, so that the elliptical tube moves inside the elliptical placing frame 4, thereby ensuring that the outer wall of the elliptical tube is always in contact with the outer wall of the welding rod, and ensuring the welding effect of the elliptical tube.
[0022] The outer wall of the connecting column 16 is provided with a bending prevention device 8, the bending prevention device 8 comprises a fixed ring 81, the inner wall of the fixed ring 81 is fixedly connected on the outer wall of the connecting column 16, the top of the fixed ring 81 is fixedly connected with a support 82, the side of the support 82 is fixedly connected with a fixed frame 83, two rotating rods 84 are penetrated and rotated at the bottom of the fixed frame 83, the top of each of the two rotating rods 84 is fixedly connected with a rolling roller 85, the outer wall of each of the two rolling rollers 85 is provided with a long slot, through the setting of the above structure, the strip passes between the two rolling rollers 85, and at the same time the two rolling rollers 85 rotate, the two rolling rollers 85 roll the surface of the strip during movement, thereby ensuring that the strip remains flat, avoiding the strip bending or lifting, affecting the precision of the subsequent process, and even causing product defects.
[0023] The outer wall of the two rotating rods 84 is fixedly connected with a one-way bearing 86 below, through the setting of the above structure, the one-way bearing 86 can limit the rotating direction of the rolling roller 85, when the strip is subjected to a pulling force, the rolling roller 85 can form a tensile force on the strip, thereby avoiding the problem that the strip is difficult to be stably welded with the elliptical tube due to the pulling force.
[0024] The bottom of the fixed frame 83 is fixedly connected with two fixed blocks 87, the inner walls of the two fixed blocks 87 are fixedly connected with long rods 88, the outer walls of the long rods 88 are rotatably connected with abutting plates 89, torsion springs 810 are arranged between the abutting plates 89 and the fixed blocks 87, one side of the abutting plate 89 is arranged in a sawtooth shape, the sawtooth part of the abutting plate 89 is arranged in an arc shape, through the arrangement of the above structure, the abutting plate 89 will be through the elastic force of the torsion spring 810, so that the sawtooth part of the abutting plate 89 is tightly attached to the surface of the strip material, the sawtooth part of the abutting plate 89 can clean the impurities on the surface of the strip material, so as to avoid the impurities on the surface of the strip material affecting the welding effect of the fin strip and the elliptical tube.
[0025] In use, the elliptical tube needing to be welded with fins is inserted into the inner wall of the elliptical placing frame 4, so that the elliptical placing frame 4 supports the elliptical tube, then the fin strip material to be welded with the elliptical tube is wound on the outer wall of the placing block 15, and then the motor one 6 and the motor two 12 are driven, the staff starts the motor one 6, the output shaft of the motor one 6 drives the rotating wheel two 10 to rotate, the rotating wheel two 10 drives the rotating wheel one 5 to rotate through the belt 11, the rotating of the rotating wheel one 5 drives the elliptical tube to rotate, at the same time, the rotation of the motor two 12 drives the thin rotating column 13 to rotate, the rotation of the thin rotating column 13 drives the circular block 14 to rotate, the rotation of the thin rotating column 13 drives the placing block 15 to rotate, the rotation of the placing block 15 drives the fin strip material to rotate, then the contact points between the welding rod and the elliptical tube are welded by the laser welding assembly 2, before welding, the strip material is close to the outer wall of the rotating elliptical tube, then the elliptical tube and the fin strip are welded by the laser welding assembly 2, when the elliptical block 7 rotates, the convex part of the elliptical block 7 pushes the outer wall of the circular block 14 and makes the circular block 14 move downward, the downward movement of the circular block 14 drives the thin rotating column 13 to move downward, the downward movement of the thin rotating column 13 drives the motor two 12 to move downward, the downward movement of the motor two 12 drives the connecting column 16 to move downward, the downward movement of the connecting column 16 drives the sliding block 17 to move downward along the inner wall of the L-shaped supporting block 18, at the same time, the sliding block 17 compresses the spring 19, when the convex part of the elliptical block 7 is away from the outer wall of the circular block 14, the spring 19 drives the sliding block 17 to reset through the elastic force of itself, the reset of the sliding block 17 drives the connecting column 16 to reset, the reset of the connecting column 16 drives the motor two 12 to reset, the reset of the motor two 12 drives the thin rotating column 13 to reset, the reset of the thin rotating column 13 drives the circular block 14 to reset, so that the outer wall of the circular block 14 is always in contact with the outer wall of the elliptical block 7, in the process of welding the elliptical tube and the fin strip, the elliptical tube is pulled by the external pulling frame to move inside the elliptical placing frame 4, so as to ensure that the outer wall of the elliptical tube is always in contact with the outer wall of the fin strip, and the welding effect of the elliptical tube is ensured.
[0026] It should be noted that the stiffness of the spring 19 is greater than the total weight of the motor two 12, the thin rotating column 13, the round block 14, the placing block 15, the connecting column 16 and the sliding block 17, so that the motor two 12, the thin rotating column 13, the round block 14, the placing block 15, the connecting column 16 and the sliding block 17 can be reset, and the driving end of the linear motor 3 can make the motor two 12, the thin rotating column 13, the round block 14, the placing block 15, the connecting column 16 and the sliding block 17 move back and forth synchronously, and the spring 19 is mainly used for controlling the up-down movement of the round block 14.
[0027] When the strip is welded to the elliptical pipe and the strip by the laser welding assembly 2, the strip is passed between the two rolling rollers 85, and the two rolling rollers 85 are rotated, so that the surfaces of the strip are rolled by the two rolling rollers 85 during movement, so that the strip is kept flat, and the strip is prevented from being bent or raised, the precision of the subsequent process is affected, and even the product is defective; meanwhile, the one-way bearing 86 can limit the rotating direction of the rolling roller 85, and the rolling roller 85 can form a tensile force on the strip when the strip is subjected to a pulling force, so that the strip is prevented from being subjected to a pulling force to cause the strip to be difficult to be welded to the elliptical pipe stably; the abutting plate 89 is tightly attached to the surface of the strip through the elastic force of the torsion spring 810, and the impurities on the surface of the strip are removed by the sawtooth part of the abutting plate 89, so that the impurities on the surface of the strip affect the welding effect of the fin strip and the elliptical pipe.
[0028] Please refer to Figures 1-8 On the basis of the above embodiment, in another embodiment of the present application, the inner wall of the support 82 is provided with an anti-misalignment device 9, the anti-misalignment device 9 comprises a triangular block 91, the bottom of the triangular block 91 is fixedly connected to the inner wall of the support 82, the side surface of the triangular block 91 is fixedly connected with a track block 92, the side surface of the track block 92 is rotatably connected with an adjusting block 93, the side surface of the adjusting block 93 is fixedly connected with a threaded rod 94, the outer wall of the threaded rod 94 is threadedly connected with a threaded sleeve 95, the side surface of the threaded sleeve 95 is fixedly connected with a connecting rod 96, and the outer wall of the connecting rod 96 is rotatably connected with a limiting roller 97, through the above structure, the movement of the connecting rod 96 drives the limiting roller 97 to abut against the side surface of the strip, so that the position of the strip is limited, and the strip is ensured to be in the same horizontal plane when being welded around the outer wall of the elliptical pipe, so that the problem that the strip is deviated when being welded to the outer wall of the elliptical pipe due to external force is avoided.
[0029] When the strip is in contact with the outer wall of the elliptical pipe, the adjusting block 93 is rotated, the rotation of the adjusting block 93 drives the threaded rod 94 to rotate, the rotation of the threaded rod 94 drives the threaded sleeve 95 to move, the movement of the threaded sleeve 95 drives the connecting rod 96 to move, and the movement of the connecting rod 96 drives the limiting roller 97 to abut against the side of the strip, thereby limiting the position of the strip, ensuring that the strip is in the same horizontal plane when being welded around the outer wall of the elliptical pipe, thereby avoiding the problem that the strip is deviated when being welded around the outer wall of the elliptical pipe due to external force.
[0030] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical scheme and the inventive concept of the present application, which should be covered within the protection scope of the present application.
Claims
1. An elliptical tube fin welding apparatus comprising a support frame (1), characterized in that: The side of the support frame (1) is provided with a laser welding assembly (2) for welding the elliptical pipe and the fin, the side of the support frame (1) is fixedly connected with a linear motor (3), the side of the support frame (1) penetrates and rotates an elliptical placing frame (4), one end of the outer wall of the elliptical placing frame (4) is fixedly connected with an elliptical block (7), the end of the outer wall of the elliptical placing frame (4) away from the elliptical block (7) is fixedly connected with a rotating wheel one (5), the side of the support frame (1) is fixedly connected with a motor one (6), the output shaft of the motor one (6) is fixedly connected with a rotating wheel two (10), the rotating wheel two (10) and the rotating wheel one (5) are drivingly connected with a belt (11), the driving end of the linear motor (3) is fixedly connected with an L-shaped supporting block (18), the inner wall of the L-shaped supporting block (18) is slidingly connected with a sliding block (17), the spring (19) is arranged between the sliding block (17) and the L-shaped supporting block (18), the side of the sliding block (17) is fixedly connected with a connecting column (16), the side of the connecting column (16) away from the sliding block (17) is fixedly connected with a motor two (12), the output shaft of the motor two (12) is fixedly connected with a thin rotating column (13), the outer wall of the thin rotating column (13) is fixedly connected with a circular block (14), and the outer wall of the thin rotating column (13) is fixedly connected with a placing block (15).
2. An elliptical tube fin welding apparatus according to claim 1, characterized in that: The outer wall of the elliptical block (7) is a smooth surface, and the outer wall of the circular block (14) is a smooth surface.
3. The device according to claim 1, wherein: The outer wall of the elliptical block (7) is in contact with the outer wall of the circular block (14).
4. The device according to claim 1, wherein: The outer wall of the connecting column (16) is provided with a bending prevention device (8), the bending prevention device (8) comprises a fixed ring (81), the inner wall of the fixed ring (81) is fixedly connected to the outer wall of the connecting column (16), the top of the fixed ring (81) is fixedly connected with a support (82), the side of the support (82) is fixedly connected with a fixed frame (83), two rotating rods (84) penetrate and rotate the bottom of the fixed frame (83), and the top of each of the two rotating rods (84) is fixedly connected with a rolling roller (85).
5. An elliptical tube fin welding apparatus according to claim 4, characterized in that: The outer wall of each of the two rotating rods (84) is fixedly connected with a one-way bearing (86) below.
6. An elliptical tube fin welding apparatus according to claim 4, wherein: The outer wall of each of the two rolling rollers (85) is provided with a long slot.
7. An elliptical tube fin welding apparatus according to claim 4, wherein: The bottom of the fixed frame (83) is fixedly connected with two fixed blocks (87), the inner wall of each of the two fixed blocks (87) is fixedly connected with a long rod (88), the outer wall of the long rod (88) is rotatably connected with a resisting plate (89), and the torsional spring (810) is arranged between the resisting plate (89) and the fixed block (87).
8. An elliptical tube fin welding apparatus according to claim 7, characterized in that: One side of the resisting plate (89) is provided in a zigzag shape, and the zigzag teeth are arranged in an arc shape.
9. The device according to claim 4, wherein: The inner wall of the support (82) is provided with an anti-positioning device (9), the anti-positioning device (9) comprises a triangular block (91), the bottom of the triangular block (91) is fixedly connected to the inner wall of the support (82), the side surface of the triangular block (91) is fixedly connected with a track block (92), the side surface of the track block (92) is rotatably connected with an adjusting block (93), the side surface of the adjusting block (93) is fixedly connected with a threaded rod (94), the outer wall of the threaded rod (94) is threadedly connected with a threaded sleeve (95), the side surface of the threaded sleeve (95) is fixedly connected with a connecting rod (96), and the outer wall of the connecting rod (96) is rotatably connected with a limiting roller (97).
10. The device according to claim 9, wherein: The bottom and the top of the threaded sleeve (95) are in contact with the inner wall of the track block (92).