A welding device for processing metal back panels of television sets

Abstract

This invention relates to the field of welding-related technologies, and in particular to a welding device for processing metal back panels of television sets. The device includes a welding box, a fixed frame, and a welding rack. The fixed frame is fixedly mounted on the top of the welding box, and the welding rack is movably mounted on the bottom of the fixed frame. A pushing welding assembly is installed inside the welding rack, which pushes the welding torch head within the assembly to move horizontally across the back panel surface, forming a continuous welding strip. The tilting lateral assembly of this invention achieves digital and programmable angle adjustment, with high precision and good repeatability, enabling it to perform automated welding of various complex welds such as flat fillet welds and vertical fillet welds. The single-point pressure assembly refines grains and releases thermal stress through mechanical impact, directly intervening in welding deformation and cold cracking hazards. The downward cleaning assembly ensures that every welding is performed on a contaminated surface, fundamentally eliminating welding defects such as porosity and slag inclusions caused by dust and oil.

Description

Technical Field

[0001] This invention relates to the field of welding-related technologies, and in particular to a welding apparatus for processing metal back panels for television sets. Background Technology

[0002] In the field of automated welding of metal back panels for televisions, existing technologies often face a series of challenges, such as insufficient adaptability to complex working conditions, prominent post-weld quality risks, and reliance on complex external systems for process reliability, which restricts further improvement in production efficiency and product consistency.

[0003] Specifically, when faced with welds on the back panel with different spatial orientations, traditional welding equipment often relies on overall workpiece adjustment or the use of bulky multi-axis robots. The angle adjustment of their welding torches is often not flexible and precise enough, making it difficult to achieve digital and programmable rapid adaptation for various joint types such as flat fillet welds and vertical fillet welds. This results in insufficient process flexibility. More importantly, the thermal stress generated during welding can easily cause back panel deformation and even cold cracks. Existing production lines usually separate welding and stress relief into independent processes, either relying on expensive and energy-consuming heat treatment equipment or using inefficient and inconsistent manual hammering. This makes it impossible to achieve precise, online stress intervention synchronized with the welding rhythm, affecting the long-term reliability of the product. In addition, ensuring the cleanliness of the workpiece surface before welding is the basis for ensuring defect-free welds. However, current methods generally rely on independent external air sources, solenoid valves, and sensor control systems. This electrically controlled cleaning link has the risk of cleaning omissions due to signal delays or component failures, and it increases system complexity and maintenance costs, greatly reducing the welding quality of the metal back panel of the television. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a welding device for processing metal back panels of television sets.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a welding device for processing metal back panels of television sets, comprising a welding box, a fixing frame and a welding frame, wherein the fixing frame is fixedly installed on the top of the welding box, and the welding frame is movably arranged at the bottom of the fixing frame, wherein a pushing welding assembly is provided inside the welding frame, and the welding gun head provided in the pushing welding assembly moves horizontally on the surface of the back panel to form a continuous welding strip;

[0006] The push welding assembly includes a rotating push plate and a push side plate. The push side plate is equipped with an angle lateral component, which is used to precisely change the angle of the welding gun head to the back plate. By using welding gun heads with different angles, welds at different angles on the back plate can be performed under actual complex working conditions.

[0007] The welding frame is equipped with a single-point pressure assembly, which is used to release the internal stress generated by welding on the weld metal on the surface of the back plate, thereby reducing the deformation and cracking tendency of the metal back plate. The single-point pressure assembly includes an L-shaped rotating rod.

[0008] A support frame is movably mounted on the fixed frame, and a downward cleaning component is mounted on the support frame. The downward cleaning component is used to clean the surface of the back plate by blowing air when the welding frame is lowered.

[0009] The pressure cleaning assembly includes a worm gear, a worm, and a fixed toothed plate that move inside the support frame, and the welding frame is fixedly mounted on the bottom end of the fixed toothed plate by an arc-shaped frame.

[0010] As a preferred embodiment of the present invention, an electric telescopic rod is fixedly installed on the top of the fixed frame. An adjusting seat is movably connected to the top of the fixed frame via a limiting slide groove, and the electric telescopic rod is fixedly installed on the adjusting seat. The electric telescopic rod pushes the adjusting seat in the limiting slide groove to move horizontally, pushing the welding assembly, which includes a first motor and a U-shaped rotating rod. The welding frame has a U-shaped frame structure. The first motor is fixedly installed on the top of the welding frame, and the top of the welding frame is movably connected to the U-shaped rotating rod, with one end of the U-shaped rotating rod fixedly installed at the output end of the first motor.

[0011] Both ends of the top of the welding frame are fixedly installed with base blocks, and each base block has a base groove. A base rod is slidably connected in the base groove, and the push side plate is fixedly installed on the base rod. A U-shaped connecting plate is movably connected between the push side plates. One end of the rotating push plate is fixedly installed on the U-shaped connecting plate, and the other end of the rotating push plate is movably connected to the U-shaped rotating rod. Both the rotating push plate and the push side plate are movable inside the welding frame.

[0012] As a preferred embodiment of the present invention, the tilting lateral assembly includes an arc-shaped base plate and a second motor. The arc-shaped base plate is fixedly installed between the pushing side plate and the end away from the rotating push plate. An arc-shaped base is fixedly installed on the arc-shaped base plate. A fixed sliding groove is opened on the top of the arc-shaped base plate. A fixed slider is slidably connected in the fixed sliding groove. An arc-shaped moving block is fixedly installed on the top of the fixed slider. A fixed tooth block is fixedly installed on the top of the arc-shaped moving block. A second motor is fixedly installed on the top of the arc-shaped base plate. A fixed gear is fixedly installed on the output end of the second motor through a rotating shaft, and the fixed gear and the fixed tooth block are movably meshed.

[0013] The arc-shaped moving block has a connecting block fixedly installed at the center of the side away from the arc-shaped base plate. A hydraulic telescopic rod is fixedly installed at the bottom of the connecting block. A welding frame is fixedly installed at the bottom end of the hydraulic telescopic rod, and the welding gun head is connected to the bottom of the welding frame. Several welding cameras are evenly installed at the bottom of the arc-shaped base, and the welding cameras move at the top center of the back plate. The welding gun head performs precise welding on the surface of the back plate.

[0014] As a preferred embodiment of the present invention, the single-point pressure assembly further includes a rotating cylinder. The welding frame is fixedly installed on the side away from the first motor. A rotating seat is fixedly installed inside the rotating frame, and an L-shaped rotating rod is movably connected to the rotating seat. A rotating cylinder is fixedly installed at the end of the U-shaped rotating rod away from the first motor, and the rotating cylinder moves inside the rotating frame.

[0015] The outer circumference of the rotating cylinder is provided with an arc-shaped actuating groove, and an arc-shaped actuating rod is movably installed in the arc-shaped actuating groove. The arc-shaped actuating rod is fixedly installed with an L-shaped rotating rod. The rotating frame is provided with a rotating groove, and the size of the rotating groove matches that of the L-shaped rotating rod. The L-shaped rotating rod moves in the rotating groove. An arc-shaped pressure column is fixedly installed at the bottom of the L-shaped rotating rod at the end away from the rotating seat. An electric push rod is provided inside the arc-shaped pressure column. The electric push rod will adjust the extension and retraction of the arc-shaped pressure column. During welding, the arc-shaped pressure column does not contact the metal back plate. When releasing the welding internal stress, the arc-shaped pressure column contacts the metal back plate.

[0016] As a preferred embodiment of the present invention, the top of the welding box is uniformly provided with several suction cups for adsorbing and fixing the metal back panel of the television. A screw is movably installed inside the adjusting seat, and a third motor that drives the screw to rotate is fixedly installed at one end of the adjusting seat. An adjusting block is threaded through the screw, and a support frame is fixedly installed on the adjusting block. A servo motor is fixedly installed inside the support frame, and a worm gear is fixedly installed at the output end of the servo motor. A support rotating rod is movably connected inside the support frame, and a worm wheel is fixedly installed at one end of the support rotating rod, and the worm wheel is movably meshed with the worm gear. A drive gear is fixedly installed at the other end of the support rotating rod. A limiting base plate is fixedly installed on the support frame. The limiting base plate has a T-shaped sliding groove, and a T-shaped slider is slidably connected in the T-shaped sliding groove. A fixing tooth plate is fixedly installed on the T-shaped slider, and the fixing tooth plate is movably meshed with the drive gear. The fixing tooth plate is movably inserted through the support frame.

[0017] The downward cleaning assembly also includes a cleaning cylinder fixedly installed on the top of the adjusting block. A piston plate is movably connected inside the cleaning cylinder. A piston rod is fixedly installed on the top of the piston plate. A movable rod is fixedly installed on the top of the fixed tooth plate, and the movable rod is fixedly installed at the top of the piston rod. A limiting groove is opened on the limiting base plate, and the movable rod moves through the limiting groove. An arc-shaped frame is fixedly installed on the bottom of the fixed tooth plate. A cleaning seat is fixedly installed on the end of the welding frame away from the rotating push plate. Several cleaning nozzles are evenly installed on the side of the cleaning seat near the welding gun head. An air inlet pipe and an air outlet pipe are opened at the bottom of the cleaning cylinder, and the air outlet pipe is connected to the cleaning seat.

[0018] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0019] 1. In this invention, the coordinated control of the electric telescopic rod and the first motor in the welding assembly enables precise control of the welding gun head throughout the entire process, from macroscopic positioning to microscopic movement. The electric telescopic rod first drives the adjustment seat to move horizontally, quickly moving the entire welding frame to the starting position, completing an efficient and rough initialization of the workstation. Subsequently, the core mechanical transmission system is activated, and the first motor drives the U-shaped rotating rod to rotate at a constant speed. Through the rotating push plate and the U-shaped connecting plate, the rotational motion is converted into a strictly limited horizontal reciprocating linear motion that pushes the side plate, ensuring that the walking speed of the welding gun head is constant and the trajectory is accurate. This fundamentally eliminates the problem of uneven heat input caused by speed fluctuations, providing crucial mechanical protection for forming continuous, uniform, and defect-free straight welds. The entire transmission chain is composed of purely mechanical components, and its reliability is far higher than that of complex CNC systems that rely on servo feedback. It is particularly suitable for the mass production and high-quality production of long straight welds on the metal back panel of television sets. While improving weld consistency and product yield, it significantly reduces the manufacturing cost and maintenance difficulty of the equipment.

[0020] 2. In this invention, the tilting lateral component is an innovative mechanism designed for complex welding spaces and diverse joint forms. It enables the fixed welding torch to have flexible spatial posture adjustment capabilities. The second motor drives the fixed gear to rotate, which meshes with the toothed block fixed on the arc-shaped moving block, driving the entire welding torch clamping unit to pitch along the slide groove of the arc-shaped base. The angular displacement of the motor is directly and linearly converted into the tilt angle of the welding torch, realizing the digitalization and programmability of angle adjustment. It has high precision and good repeatability. At the same time, the independent hydraulic telescopic rod is responsible for maintaining a constant contact pressure of the welding torch during operation, ensuring a stable electrical and thermal conductivity at different angles. The welding camera integrated at the bottom of the arc-shaped base captures images, providing synchronous visual data for monitoring and evaluating the welding quality at different angles. This component greatly expands the process range of a single machine, enabling it to handle automated welding of various complex welds such as flat fillet welds and vertical fillet welds, avoiding the cost of customizing special machines for specific welds and improving the flexibility of the production line.

[0021] 3. In this invention, the single-point pressure component cleverly utilizes the driving source of the welding torch to achieve online stress relief of the weld seam through pure mechanical linkage. This is a key design that actively improves structural reliability. Its core is a cam and lever mechanism consisting of a rotating cylinder, an arc-shaped actuating groove, and an L-shaped rotating rod. When the first motor driving the welding torch runs, it synchronously drives the rotating cylinder to rotate. The special contour groove on the cylinder periodically actuates the lever, causing the arc-shaped pressure column at the end to momentarily press down. The pressure column integrates an electric push rod, giving it a telescopic function: during welding... The weld is retracted to avoid interference, and then extended to contact and hammer when the weld cools to the optimal stress relief temperature range (e.g., 700-850°C). This time-controlled hammering can refine the grains and release thermal stress through mechanical impact at high temperatures when the weld metal still has good plasticity, directly intervening in the potential for welding deformation and cold cracking. This design seamlessly integrates welding and important post-weld heat treatment processes into the same process, replacing traditional inefficient manual hammering or expensive subsequent heat treatment processes with mechanical automation, significantly improving the dimensional stability and fatigue life of the product.

[0022] 4. In this invention, the downward-pressing cleaning component, with its extremely simple and reliable mechanical forced linkage principle, ensures flawless cleaning of the workpiece surface before welding, laying an environmental foundation for high-quality welding. It directly converts the mechanical energy of the welding frame's descent into cleaning kinetic energy. When the servo motor drives the fixed toothed plate downwards through the worm gear and rack and pinion mechanism, thereby bringing the welding frame closer to the workpiece, the rigidly connected movable rod on the fixed toothed plate simultaneously presses down on the piston inside the cleaning cylinder, instantly generating compressed air. This airflow, within the critical time window before the welding torch contacts the workpiece, forms a purge airflow curtain through the cleaning nozzle. The entire process... Reliability is guaranteed by the mechanical connection. As long as the welding frame descends, cleaning will definitely occur, completely eliminating the risk of missed cleaning due to electronic sensor or solenoid valve failure or program error. The cleaning cylinder adopts a one-way valve design, which automatically draws in air and stores energy when the welding frame is raised, preparing for the next cleaning. This eliminates the need for an independent external air source, air compressor, and complex electrical control system. It not only greatly simplifies the structure and reduces energy consumption and cost, but also ensures that every welding is carried out on a contamination-free surface with "physical law" level reliability, fundamentally eliminating welding defects such as porosity and slag inclusion caused by dust and oil.

[0023] 5. In this invention, an array-type negative pressure suction cup replaces the traditional mechanical clamp. Utilizing vacuum adsorption force evenly distributed over a large area of ​​the back plate, it achieves full-plane, stress-free clamping, effectively preventing deformation of the thin plate back plate caused by clamping force. This provides a perfect reference plane for high-precision welding. For welding torch positioning, a multi-axis collaborative strategy is employed: an electric telescopic rod handles rapid alignment along the X-axis (lateral); a third motor drives a screw and nut mechanism for precise Y-axis (longitudinal) position adjustment; finally, a servo motor drives a worm gear pair with a self-locking function to control the welding torch's smooth, precise, and reliable descent and locking along the Z-axis (vertical). This multi-axis system enables rapid positioning and micron-level precision at the welding torch's starting point within a large workspace, quickly and accurately guiding the welding torch to the optimal starting point. This creates crucial prerequisites for subsequent high-quality automated welding processes and significantly reduces production auxiliary time. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the fixing frame of the present invention;

[0026] Figure 3 This is a schematic diagram of the welding frame of the present invention;

[0027] Figure 4 This is a schematic diagram of the U-shaped rotating rod of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the base block of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of the structure at point A in the middle;

[0030] Figure 7 This is a schematic diagram of the arc-shaped base plate of the present invention;

[0031] Figure 8 This is a schematic diagram of the arc-shaped base of the present invention;

[0032] Figure 9 This is a schematic diagram of the internal structure of the cleaning cylinder of the present invention;

[0033] Figure 10 This is a schematic diagram of the internal structure of the support frame of the present invention.

[0034] The components include: 10. Welding box; 11. Fixing frame; 12. Electric telescopic rod; 13. Limiting slide groove; 14. Adjusting seat; 15. Fixing suction cup; 16. Screw; 17. Third motor; 18. Adjusting block; 20. Welding frame; 21. First motor; 22. U-shaped rotating rod; 23. Rotating push plate; 24. Base block; 25. Base groove; 26. Base rod; 27. Pushing side plate; 28. U-shaped connecting plate; 30. Arc-shaped base plate; 31. Second motor; 32. Arc-shaped base; 33. Fixing slide groove; 34. Fixing slider; 35. Arc-shaped moving block; 36. Fixing tooth block; 37. Fixing gear; 38. Welding camera; 40. Connecting block; 41. Hydraulic extension... 42. Welding frame; 43. Welding gun head; 50. Rotating frame; 51. Rotating cylinder; 52. Rotating seat; 53. Arc-shaped actuating groove; 54. Arc-shaped actuating rod; 55. L-shaped rotating rod; 56. Rotating groove; 57. Arc-shaped pressure column; 60. Support frame; 61. Servo motor; 62. Worm gear; 63. Support rotating rod; 64. Worm wheel; 65. Drive gear; 66. Limiting base plate; 67. T-shaped slide groove; 68. T-shaped slider; 69. Fixed toothed plate; 70. Cleaning cylinder; 71. Piston plate; 72. Piston rod; 73. Movable rod; 74. Limiting groove; 75. Arc-shaped frame; 76. Cleaning seat; 77. Cleaning nozzle; 78. Air inlet pipe; 79. Air outlet pipe. Detailed Implementation

[0035] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0036] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a welding device for processing a metal back panel of a television set includes a welding box 10, a fixing frame 11, and a welding frame 20. The fixing frame 11 is fixedly installed on the top of the welding box 10, and the welding frame 20 is movably installed at the bottom of the fixing frame 11. A pushing welding assembly is provided inside the welding frame 20. The welding gun head 43 in the pushing welding assembly moves horizontally on the surface of the back panel to form a continuous welding strip. The pushing welding assembly includes a rotating push plate 23 and a pushing side plate 27. An electric telescopic rod 12 is fixedly installed on the top of the fixing frame 11, and the top of the fixing frame 11 is connected by a limiting groove. The 13 is movably connected to the adjustment seat 14, and the electric telescopic rod 12 is fixedly installed on the adjustment seat 14. The electric telescopic rod 12 pushes the adjustment seat 14 in the limiting slide groove 13 to move horizontally, so that the welding frame 20 can reach the top of the metal back panel of the TV. The welding assembly includes a first motor 21 and a U-shaped rotating rod 22. The welding frame 20 has a U-shaped frame structure. The first motor 21 is fixedly installed on the top of the welding frame 20. The top of the welding frame 20 is movably connected to the U-shaped rotating rod 22, and one end of the U-shaped rotating rod 22 is fixedly installed on the output end of the first motor 21.

[0037] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Both ends of the top of the welding frame 20 are fixedly installed with base blocks 24, and each base block 24 has a base groove 25. A base rod 26 is slidably connected in the base groove 25. The push side plate 27 is fixedly installed on the base rod 26. A U-shaped connecting plate 28 is movably connected between the push side plates 27. One end of the rotating push plate 23 is fixedly installed on the U-shaped connecting plate 28, and the other end of the rotating push plate 23 is movably connected to the U-shaped rotating rod 22. Both the rotating push plate 23 and the push side plate 27 are movable inside the welding frame 20.

[0038] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 When welding begins, the electric telescopic rod 12 at the top of the fixed frame 11 pushes the adjusting seat 14 to move horizontally along the limiting slide groove 13, thereby quickly and accurately moving the entire welding frame 20 directly above the back plate to be welded, eliminating the need for manual adjustment and coarse alignment, realizing rapid initialization of the welding station and improving production efficiency.

[0039] After positioning, the first motor 21, fixed to the top of the welding frame 20, starts, driving the U-shaped rotating rod 22 to rotate at a constant speed. The U-shaped rotating rod 22 drives the rotating push plate 23, which is movably connected to it, to move. The rotating push plate 23 then pushes the U-shaped connecting plate 28. Since the U-shaped connecting plate 28 is rigidly connected to the pushing side plates 27 on both sides, and the pushing side plates 27 are restricted in the base groove 25 of the base block 24 by the base rod 26 at their bottom, they can only slide horizontally. Therefore, the rotational motion of the first motor 21 is precisely converted into the synchronous and stable horizontal reciprocating linear motion of the pushing side plates 27, ensuring that the welding gun head 43 can move at a constant speed along the pre-set path. The path movement fundamentally ensures the uniformity of welding heat input, providing core mechanical support for forming continuous, uniform, and defect-free straight welds. This greatly improves the stability and repeatability of welding quality, drives the horizontal reciprocating motion of the side plate 27, and moves the entire tilting lateral assembly integrated inside it together. Ultimately, the welding gun head 43, installed at the bottom of the hydraulic telescopic rod 41, completes a uniform welding movement on the metal back plate surface. The entire process is achieved through pure mechanical transmission, with precise and reliable motion trajectory. This avoids the high cost and maintenance difficulty associated with using complex CNC systems, making it particularly suitable for efficient and batch welding operations of long straight welds.

[0040] See Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 A tilting lateral assembly is installed on the push side plate 27. The tilting lateral assembly is used to precisely change the welding angle of the welding gun head 43 to the back plate. By using welding gun heads 43 at different angles, welding is performed on the back plate at different angles under actual complex working conditions. The tilting lateral assembly includes an arc-shaped base plate 30 and a second motor 31. The arc-shaped base plate 30 is fixedly installed on the push side plate 27 at the end away from the rotating push plate 23. An arc-shaped base 32 is fixedly installed on the arc-shaped base plate 30. The top of the arc-shaped base 32 has an opening. A fixed slide 33 is fixedly connected to a fixed slider 34. An arc-shaped moving block 35 is fixedly installed on the top of the fixed slider 34. A fixed tooth block 36 is fixedly installed on the top of the arc-shaped moving block 35. A second motor 31 is fixedly installed on the top of the arc-shaped base plate 30. A fixed gear 37 is fixedly installed on the output end of the second motor 31 through a rotating shaft. The fixed gear 37 and the fixed tooth block 36 are in movable engagement. Both the arc-shaped base plate 30 and the arc-shaped moving block 35 are movable inside the welding frame 20.

[0041] See Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8A connecting block 40 is fixedly installed on the center of the arc-shaped moving block 35 on the side away from the arc-shaped base plate 30. A hydraulic telescopic rod 41 is fixedly installed on the bottom of the connecting block 40. A welding frame 42 is fixedly installed at the bottom end of the hydraulic telescopic rod 41, and the welding gun head 43 is connected to the bottom of the welding frame 42. The pressure of the welding gun head 43 on the surface of the metal back plate is adjusted by the hydraulic telescopic rod 41. Several welding cameras 38 are evenly installed on the bottom of the arc-shaped base 32, and the welding cameras 38 are movable at the top center of the back plate. The welding gun head 43 performs precise welding on the surface of the back plate, and the welding quality of the metal back plate is recorded by the welding cameras 38.

[0042] See Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 When welding encounters complex structures or requires welding at specific angles (such as flat fillet welds and vertical fillet welds), the tilting lateral component starts working. The second motor 31 drives the fixed gear 37 to rotate. Utilizing the meshing relationship between the gear and the fixed tooth block 36 installed on the top of the arc-shaped moving block 35, the entire arc-shaped moving block 35 is driven to move along the fixed slide groove 33 on the arc-shaped base 32 in a precise arc-shaped trajectory. The rotational motion of the motor is directly converted into the pitching motion of the welding torch clamping mechanism along the predetermined arc. Its angle control is entirely determined by the rotational angular displacement of the motor, thereby realizing the digital, high-precision, and repeatable adjustment of the tilt angle of the welding torch head 43, overcoming the shortcomings of traditional manual adjustment which is time-consuming, labor-intensive, and inconsistent.

[0043] The angle change of the arc-shaped moving block 35 is directly transmitted to the hydraulic telescopic rod 41 and welding gun head 43 fixed in front of it via the connecting block 40. This allows the welding gun to be aligned with the workpiece at various preset or real-time calculated tilt angles, enabling a single device to flexibly adapt to various welding joint forms, significantly improving the process adaptability and versatility of the equipment. Complex welding tasks can be completed without changing fixtures or equipment. At the same time, the hydraulic telescopic rod 41 can apply and maintain a constant contact pressure on the welding gun head 43 independently of the angle adjustment mechanism, ensuring stable electrical and heat transfer conditions between the welding gun and the workpiece at different angles. This is the key to ensuring reliable arc ignition and weld formation quality.

[0044] The entire welding process is synchronously recorded by multiple welding cameras 38 evenly distributed at the bottom of the arc-shaped base 32. These cameras move and rotate with the entire tilting assembly, always obtaining a stable shooting angle. They can capture multi-dimensional visual information such as the dynamics of the weld pool, the appearance of the weld formation, and the changes in the heat-affected zone in real time, and accurately correlate them with the current welding angle, pressure, and other process parameters in time and space. This enables online monitoring and quantitative evaluation of the stability of the welding process and the quality of the weld formation, providing intuitive and reliable data support for process optimization and quality traceability, and elevating post-event inspection to process prevention, greatly improving quality control capabilities.

[0045] See Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The welding frame 20 is equipped with a single-point pressure component, which is used to release the internal stress generated by welding on the weld metal of the back plate surface, thereby reducing the deformation and cracking tendency of the metal back plate. The single-point pressure component includes an L-shaped rotating rod 55 and a rotating cylinder 51. The welding frame 20 has a rotating frame 50 fixedly installed on the side away from the first motor 21. Both the rotating cylinder 51 and the rotating frame 50 are columnar structures. A rotating seat 52 is fixedly installed inside the rotating frame 50, and the L-shaped rotating rod 55 is movably connected to the rotating seat 52. The rotating cylinder 51 is fixedly installed at the end of the U-shaped rotating rod 22 away from the first motor 21, and the rotating cylinder 51 moves inside the rotating frame 50.

[0046] See Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The rotating cylinder 51 has an arc-shaped actuating groove 53 on its outer periphery, and an arc-shaped actuating rod 54 is movably installed in the arc-shaped actuating groove 53. The arc-shaped actuating rod 54 is fixedly installed with an L-shaped rotating rod 55. The rotating frame 50 has a rotating groove 56, and the rotating groove 56 is matched in size with the L-shaped rotating rod 55. The L-shaped rotating rod 55 moves in the rotating groove 56. An arc-shaped pressure column 57 is fixedly installed at the bottom of the end of the L-shaped rotating rod 55 away from the rotating seat 52. An electric push rod 58 is installed inside the arc-shaped pressure column 57. The electric push rod 58 will extend and retract the arc-shaped pressure column 57. During welding, the arc-shaped pressure column 57 does not contact the metal back plate. When releasing the welding internal stress, the arc-shaped pressure column 57 contacts the metal back plate.

[0047] See Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6When the first motor 21 that drives the welding torch to move horizontally is running, the rotating cylinder 51 at the end of its U-shaped rotating rod 22 rotates synchronously. The arc-shaped actuating groove 53 on the outer periphery of the rotating cylinder 51 moves accordingly and periodically actuates the arc-shaped actuating rod 54 that cooperates with it, forcing the L-shaped rotating rod 55 to swing rapidly and regularly around the fulcrum of the rotating seat 52. By cleverly utilizing the existing welding drive source and through the purely mechanical cam and lever principle, the continuous rotational motion is converted into periodic instantaneous downward pressure. No additional independent power source is required, which realizes efficient energy and motion reuse and simplifies the overall structure.

[0048] To ensure the safety and effectiveness of the hammering process, the arc-shaped pressure column 57 integrates a telescopic mechanism consisting of an electric push rod 58. During the welding stage, the electric push rod 58 keeps the arc-shaped pressure column 57 in a retracted state, maintaining a safe distance from the surface of the metal backing plate. This completely avoids interference with the high-temperature molten pool and the solidifying weld, ensuring the absolute purity and stability of the welding process. After welding, when the weld temperature cools to the optimal stress relief range (e.g., 700-850°C), the control system instructs the electric push rod 58 to extend, causing the arc-shaped pressure column 57 to descend to the working position in contact with the weld. At this time, the continuously swinging L-shaped rotating rod 55 can drive the arc-shaped pressure column 57 to perform precise and instantaneous hammering on specific points of the weld (e.g., the stress concentration arc initiation / exit point, weld toe).

[0049] This hammering action can induce slight plastic deformation in the weld metal while it is still in a high-temperature plastic state through mechanical impact, thereby effectively breaking up coarse dendrites, refining the weld structure, and partially releasing the thermal stress accumulated during welding. This function directly targets the two major quality hazards of welding deformation and cold cracking, providing an online and proactive process control method rather than post-treatment. It can significantly improve the dimensional stability and long-term service reliability of the metal back panel of the TV as a key load-bearing structure. The force and frequency of the entire hammering can be programmed and controlled by adjusting the speed of the first motor 21 or the contour of the customized arc-shaped actuation groove 53, realizing the automation and programmable integration of welding and post-weld heat treatment processes on a single device, improving the continuity and intelligence of the manufacturing process.

[0050] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , Figure 9 and Figure 10The top of the welding box 10 is evenly provided with several suction cups 15 for adsorbing and fixing the metal back panel of the television. A screw 16 is movably installed inside the adjusting base 14, and a third motor 17 that drives the screw 16 to rotate is fixedly installed at one end of the adjusting base 14. An adjusting block 18 is threaded through the screw 16, and a support frame 60 is fixedly installed on the adjusting block 18. A servo motor 61 is fixedly installed inside the support frame 60, and a worm gear 62 is fixedly installed at the output end of the servo motor 61. The support frame 60 is movably connected to... A support rod 63 is provided, and a worm gear 64 is fixedly installed at one end of the support rod 63, and the worm gear 64 is movably meshed with the worm 62. A drive gear 65 is fixedly installed at the other end of the support rod 63. A limiting base plate 66 is fixedly installed on the support frame 60. The limiting base plate 66 has a T-shaped slide groove 67. A T-shaped slider 68 is slidably connected in the T-shaped slide groove 67. A fixed toothed plate 69 is fixedly installed on the T-shaped slider 68. The fixed toothed plate 69 is movably meshed with the drive gear 65. The fixed toothed plate 69 movably passes through the support frame 60.

[0051] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , Figure 9 and Figure 10 A support frame 60 is movably mounted on the fixed frame 11. A downward cleaning component is mounted on the support frame 60. This component cleans the surface of the backplate by blowing air when the welding frame 20 descends. The downward cleaning component includes a worm gear 64, a worm 62, and a fixed toothed plate 69, all movable inside the support frame 60. The welding frame 20 is fixedly mounted on the bottom end of the fixed toothed plate 69 via an arc-shaped frame 75. Additionally, a control system is located on the top of the welding box 10. The control system includes a display and a control keyboard. The downward cleaning component also includes a cleaning cylinder 70 fixedly mounted on the top of the adjusting block 18. A piston plate 71 is movably connected inside the cleaning cylinder 70. A piston rod 72 is fixedly mounted on the top of the piston plate 71. A movable rod 73 is fixedly mounted on the top of the fixed toothed plate 69. The piston rod 72 is fixedly installed at the top end. The limiting base plate 66 has a limiting groove 74. The movable rod 73 moves through the limiting groove 74. The bottom of the fixed tooth plate 69 is fixedly installed with an arc-shaped frame 75. The welding frame 20 has a cleaning seat 76 fixedly installed at the end away from the rotating push plate 23. Several cleaning nozzles 77 are evenly installed on the side of the cleaning seat 76 near the welding gun head 43. The bottom of the cleaning cylinder 70 has an air inlet pipe 78 and an air outlet pipe 79. The air outlet pipe 79 is connected to the cleaning seat 76. One-way valves are fixedly installed on both the air inlet pipe 78 and the air outlet pipe 79. The one-way valve on the air inlet pipe 78 ensures that the cleaning cylinder 70 is filled with air in one direction. The one-way valve on the air outlet pipe 79 allows the compressed air inside the cleaning cylinder 70 to be discharged into the cleaning seat 76 in one direction.

[0052] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 , Figure 9 and Figure 10 When welding begins, the metal back plate to be welded is placed on the welding box 10. Several fixed suction cups 15 on the top of the box are energized to generate negative pressure, which firmly adsorbs the back plate. The large-area negative pressure adsorption replaces the mechanical clamps, avoiding local deformation of the back plate caused by improper clamping force, and providing a stress-free, full-plane support reference for high-precision welding.

[0053] Subsequently, the device positions the welding torch. First, the third motor 17 inside the adjusting seat 14 drives the screw 16 to rotate, causing the adjusting block 18, which is threaded to it, to move the entire support frame 60 precisely along the longitudinal direction. This achieves rapid and accurate pre-positioning of the welding starting point in the Y-axis direction, reducing the subsequent adjustment range. After positioning, the servo motor 61 inside the support frame 60 starts, driving the worm gear 62 to rotate. Through the worm wheel 64 meshing with it, the power is transmitted to the support rotating rod 63 and the drive gear 65. The drive gear 65 meshes with the vertically installed fixed toothed plate 69, converting the rotational motion into linear motion. The fixed toothed plate 69 is rigidly connected to the welding frame 20 through the arc-shaped frame 75 at the bottom, thereby driving the entire welding execution unit to descend smoothly. The use of a worm gear pair as the core transmission ensures that the welding frame 20 can be reliably locked at any height position without the risk of falling, greatly improving the safety of equipment operation and the accuracy of position holding.

[0054] The downward movement of the welding frame 42 is physically linked to the pre-welding cleaning function. When the fixed toothed plate 69 is driven to move downward, the movable rod 73 fixed on its top is pressed down simultaneously, pushing the piston rod 72 and the piston plate 71 in the cleaning cylinder 70 downward. The piston plate 71 compresses the air in the cylinder to generate positive pressure. This pressure opens the one-way valve on the air pipe 79, allowing compressed air to enter the cleaning seat 76 through the pipe. Finally, it is sprayed out at high speed by a set of evenly distributed cleaning nozzles 77, forming a cleaning airflow curtain covering the welding path. This linkage mechanism ensures an absolute sequence: as soon as the welding frame begins to descend, the cleaning airflow will definitely clean the welding area before the welding torch contacts the workpiece. This fundamentally eliminates cleaning omissions caused by electronic sensor failures or program delays, achieving the highest operational reliability with the simplest mechanical principle.

[0055] When welding is completed and the fixed toothed plate 69 rises, the movable rod 73 drives the piston plate 71 to reset. At this time, negative pressure is generated in the cleaning cylinder 70, and the one-way valve on the air inlet pipe 78 opens to draw in outside air, reserving "ammunition" for the next cleaning. The entire cleaning process does not require an additional air compressor for real-time air supply or independent solenoid valve control. It is driven only by the mechanical energy of the lifting and lowering of the welding frame 42, achieving the triple benefits of energy saving, high efficiency and extreme reliability. It significantly reduces system complexity and energy consumption, and ensures that each welding is performed on a clean workpiece surface, providing a basic environmental guarantee for obtaining high-quality welds.

[0056] Working principle: At the start of welding, the metal backplate of the television set to be welded is placed horizontally on the welding box 10. The electric telescopic rod 12 at the top of the fixing frame 11 pushes the adjusting seat 14 horizontally along the limiting slide groove 13 of the side frame, thereby moving the entire welding frame 20 suspended below to the predetermined starting position above the backplate. Subsequently, several fixed suction cups 15 at the top of the welding box 10 are energized, generating negative pressure to firmly adsorb and fix the metal backplate to the top of the welding box 10, ensuring absolute stability of the backplate position during subsequent welding, providing a foundation for obtaining high-precision welds.

[0057] Then, the first motor 21 fixed on the top of the welding frame 20 starts, driving the U-shaped rotating rod 22 to rotate at a constant speed. The U-shaped rotating rod 22 then synchronously drives the rotating push plate 23 to move. The rotating push plate 23 pushes the U-shaped connecting plate 28. Since the U-shaped connecting plate 28 is rigidly connected to the pushing side plates 27 on both sides, and the pushing side plates 27 are restricted to horizontal movement in the base groove 25 of the base block 24 by the base rod 26 at the bottom, the rotational motion of the first motor 21 is converted into synchronous horizontal reciprocating linear motion of the pushing side plates 27. That is, the pushing side plates 27 make stable horizontal linear motion between the base blocks 24. The horizontal linear motion of the pushing side plates 27 drives the tilting lateral components inside to move horizontally as a whole, so that the welding gun head 43 at the bottom of the hydraulic telescopic rod 41 moves along the preset path at a constant speed, thereby forming a continuous, uniform, and consistent straight weld seam on the back plate.

[0058] When the angle of the welding torch needs to be adjusted, the second motor 31 in the tilting lateral assembly drives the fixed gear 37 to rotate. Through meshing with the fixed tooth block 36, the arc-shaped moving block 35 moves along the fixed slide groove 33 of the arc-shaped base 32 in a precise arc-shaped trajectory, thereby directly changing the tilt angle of the hydraulic telescopic rod 41 and the welding torch 43 relative to the horizontal plane. By controlling the second motor 31, the welding torch 43 can perform multi-angle, programmable moving welding on the back plate at various preset angles, enabling the device to complete the formation of welds with different tilt angles (such as flat fillet welds and vertical fillet welds) for complex structures or space-constrained working conditions. The entire welding process is synchronously captured and recorded by the welding camera 38 at the bottom of the arc-shaped base 32. By analyzing visual information such as the dynamics of the weld pool and the appearance of the weld formation, real-time monitoring and evaluation of the welding process stability and weld formation quality are achieved.

[0059] When the U-shaped rotating rod 22 rotates, the rotating cylinder 51 at its end rotates synchronously. The outer circumference of the rotating cylinder 51 has an arc-shaped actuating groove 53. As the rotating cylinder 51 rotates, its arc-shaped actuating groove 53 periodically actuates the corresponding arc-shaped actuating rod 54, causing the L-shaped rotating rod 55 to swing rapidly around the fulcrum of the rotating seat 52. The arc-shaped pressure column 57 at the bottom of the L-shaped rotating rod 55 then rises and presses down instantaneously, generating a momentary, high-load pulse pressure on a specific point on the back plate directly below. This pressure is controlled by adjusting the rotation speed of the first motor 21. The contour of the high-speed or arc-shaped toggle groove 53 can control the frequency and force of single-point pressure. Through this mechanical linkage, programmed instantaneous hammering can be performed on specific points (such as the arc start / end point of the weld, or between multiple layers of weld) on a continuous welding path. When interlocked with an infrared temperature sensor, it can ensure that the hammering action is only performed within the optimal stress relief range (such as 700-850°C) of the weld temperature, thereby achieving hammering while welding, effectively refining grains, releasing internal stress, and suppressing deformation and hot cracking.

[0060] When welding is required, the third motor 17 in the adjusting seat 14 drives the screw 16 to rotate, causing the adjusting block 18 to move the entire support frame 60 horizontally and longitudinally. Subsequently, the servo motor 61 in the support frame 60 starts, driving the worm gear 62 to rotate. The worm gear 62 drives the worm wheel 64 that meshes with it, which in turn drives the drive gear 65 to rotate through the support rotating rod 63. The drive gear 65 meshes with the rack on the fixed tooth plate 69. Since the fixed tooth plate 69 is restricted in the T-shaped groove 67 of the limiting base plate 66 by the T-shaped slider 68, the rotation of the gear is converted into the vertical downward movement of the fixed tooth plate 69. The arc-shaped frame 75 at the bottom of the fixed tooth plate 69 finally drives the welding frame 20 to descend smoothly on the top of the metal back plate until the welding gun head 43 performs welding operations on the metal background surface.

[0061] As the fixed toothed plate 69 moves downward, driving the welding frame 20, the movable rod 73 at the top of the fixed toothed plate 69 also presses down synchronously, pushing the piston rod 72 and the piston plate 71 inside the cleaning cylinder 70 downward. The piston plate 71 generates positive pressure inside the cleaning cylinder 70, forcing the air inside the cleaning cylinder 70 into the cleaning seat 76 through the air outlet pipe 79, and then spraying it out at high speed from the multiple cleaning nozzles 77 on it. This airflow continuously blows across the surface of the metal back panel of the television during the descent of the welding frame 20, removing dust and tiny particles that may affect the welding accuracy. When the welding is finished and the fixed toothed plate 69 rises, the movable rod 73 drives the piston plate 71 to rise synchronously through the piston rod 72. The piston plate 71 creates negative pressure inside the cleaning cylinder 70, and the cleaning cylinder 70 draws in external air through the air inlet pipe 78 to prepare for the next cleaning. This achieves complete mechanical linkage and synchronization between the welding and cleaning actions, requiring no additional control or energy, making it highly efficient and reliable.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A welding device for processing a metal back plate of a television set, comprising a welding box (10), a fixing frame (11) and a welding frame (20), the top of the welding box (10) is fixedly provided with the fixing frame (11), and the bottom of the fixing frame (11) is movably provided with the welding frame (20), characterized in that, The welding frame (20) is equipped with a pushing welding assembly, which pushes the welding gun head (43) in the welding assembly to move horizontally on the back plate surface to form a continuous welding strip; The push welding assembly includes a rotating push plate (23) and a push side plate (27). An angle lateral component is provided on the push side plate (27). The angle lateral component is used to precisely change the angle of the welding gun head (43) to the back plate. By using welding gun heads (43) with different angles, welds at different angles on the back plate under actual complex working conditions are performed. The welding frame (20) is equipped with a single-point pressure assembly. The single-point pressure assembly is used to release the internal stress generated by welding on the weld metal of the back plate surface, reduce the deformation and crack tendency of the metal back plate. The single-point pressure assembly includes an L-shaped rotating rod (55). A support frame (60) is movably mounted on the fixed frame (11), and a downward cleaning component is mounted on the support frame (60). The downward cleaning component is used to clean the surface of the back plate by blowing air when the welding frame (20) is lowered. The pressure cleaning assembly includes a worm gear (64), a worm (62), and a fixed toothed plate (69) that are movable inside the support frame (60), and the welding frame (20) is fixedly mounted on the bottom end of the fixed toothed plate (69) by an arc frame (75); The welding assembly includes a first motor (21) and a U-shaped rotating rod (22). The welding frame (20) is a spiral frame structure. The first motor (21) is fixedly installed on the top of the welding frame (20). The top of the welding frame (20) is movably connected to the U-shaped rotating rod (22), and one end of the U-shaped rotating rod (22) is fixedly installed on the output end of the first motor (21). The welding frame (20) has base blocks (24) fixedly installed at both ends of the top, and each base block (24) has a base groove (25). Each base groove (25) is slidably connected to a base rod (26), and the push side plate (27) is fixedly installed on the base rod (26). A U-shaped connecting plate (28) is movably connected between the push side plates (27). One end of the rotating push plate (23) is fixedly installed on the U-shaped connecting plate (28), and the other end of the rotating push plate (23) is movably connected to the U-shaped rotating rod (22). Both the rotating push plate (23) and the pushing side plate (27) are movable inside the welding frame (20).

2. The welding device for processing metal back panels of television sets according to claim 1, characterized in that, An electric telescopic rod (12) is fixedly installed on the top of the fixed frame (11). An adjusting seat (14) is movably connected to the top of the fixed frame (11) through a limiting slide groove (13). The electric telescopic rod (12) is fixedly installed on the adjusting seat (14). The electric telescopic rod (12) pushes the adjusting seat (14) in the limiting slide groove (13) to move horizontally.

3. The welding device for processing metal back panels of television sets according to claim 1, characterized in that, The tilting lateral assembly includes an arc-shaped base plate (30) and a second motor (31). The arc-shaped base plate (30) is fixedly installed between the push side plate (27) and the end away from the rotating push plate (23). An arc-shaped base (32) is fixedly installed on the arc-shaped base plate (30). A fixed slide groove (33) is opened on the top of the arc-shaped base (32). A fixed slider (34) is slidably connected in the fixed slide groove (33). An arc-shaped moving block (35) is fixedly installed on the top of the fixed slider (34). A fixed tooth block (36) is fixedly installed on the top of the arc-shaped moving block (35), and a second motor (31) is fixedly installed on the top of the arc-shaped base plate (30). A fixed gear (37) is fixedly installed on the output end of the second motor (31) through a rotating shaft, and the fixed gear (37) and the fixed tooth block (36) are in active meshing.

4. The welding apparatus for processing metal back panels of television sets according to claim 3, characterized in that, The arc-shaped moving block (35) has a connecting block (40) fixedly installed at the center of the side away from the arc-shaped base plate (30). A hydraulic telescopic rod (41) is fixedly installed at the bottom of the connecting block (40). A welding frame (42) is fixedly installed at the bottom end of the hydraulic telescopic rod (41), and the welding gun head (43) is connected to the bottom of the welding frame (42). Several welding cameras (38) are evenly installed on the bottom of the arc-shaped base (32), and the welding cameras (38) are located at the top center of the back plate. The welding gun head (43) performs precise welding on the surface of the back plate.

5. The welding apparatus for processing metal back panels of television sets according to claim 2, characterized in that, The single-point pressure assembly also includes a rotating cylinder (51), and a rotating frame (50) is fixedly installed on the side of the welding frame (20) away from the first motor (21). A rotating seat (52) is fixedly installed inside the rotating frame (50), and an L-shaped rotating rod (55) is movably connected to the rotating seat (52). The U-shaped rotating rod (22) has a rotating cylinder (51) fixedly installed at the end away from the first motor (21), and the rotating cylinder (51) moves inside the rotating frame (50).

6. The welding apparatus for processing metal back panels of television sets according to claim 5, characterized in that, The outer periphery of the rotating cylinder (51) is provided with an arc-shaped actuation groove (53), and an arc-shaped actuation rod (54) is movably arranged in the arc-shaped actuation groove (53), and the arc-shaped actuation rod (54) is fixedly installed with the L-shaped rotating rod (55). The rotating frame (50) has a rotating groove (56), and the rotating groove (56) is matched with the size of the L-shaped rotating rod (55). The L-shaped rotating rod (55) moves in the rotating groove (56). An arc-shaped pressure column (57) is fixedly installed at the bottom of the end of the L-shaped rotating rod (55) away from the rotating seat (52). An electric push rod (58) is installed inside the arc-shaped pressure column (57). The electric push rod (58) will adjust the arc-shaped pressure column (57) by extension and retraction. During welding, the arc-shaped pressure column (57) does not contact the metal back plate. When the welding internal stress is released, the arc-shaped pressure column (57) contacts the metal back plate.

7. The welding apparatus for processing metal back panels of television sets according to claim 2, characterized in that, The top of the welding box (10) is evenly provided with several fixed suction cups (15) for adsorbing and fixing the metal back plate of the TV. The adjustment seat (14) is movably provided with a screw (16), and a third motor (17) that drives the screw (16) to rotate is fixedly installed at one end of the adjustment seat (14). An adjustment block (18) is threaded through the screw (16), and a support frame (60) is fixedly installed on the adjustment block (18). A servo motor (61) is fixedly installed inside the support frame (60). A worm gear (62) is fixedly installed at the output end of the servo motor (61). A support rotating rod (63) is movably connected inside the support frame (60). A worm wheel (64) is fixedly installed at one end of the support rotating rod (63), and the worm wheel (64) is movably meshed with the worm gear (62). A drive gear (65) is fixedly installed at the other end of the support rotating rod (63). A limit base plate (66) is fixedly installed on the support frame (60). A T-shaped slide groove (67) is provided on the limit base plate (66). A T-shaped slider (68) is slidably connected in the T-shaped slide groove (67). A fixed toothed plate (69) is fixedly installed on the T-shaped slider (68). The fixed toothed plate (69) is movably meshed with the drive gear (65), and the fixed toothed plate (69) movably passes through the support frame (60).

8. The welding apparatus for processing metal back panels of television sets according to claim 7, characterized in that, The downward cleaning assembly also includes a cleaning cylinder (70) fixedly installed on the top of the adjusting block (18). A piston plate (71) is movably connected inside the cleaning cylinder (70). A piston rod (72) is fixedly installed on the top of the piston plate (71). A movable rod (73) is fixedly installed on the top of the fixed tooth plate (69). The movable rod (73) is fixedly installed at the top of the piston rod (72). A limiting groove (74) is opened on the limiting bottom plate (66). The movable rod (73) moves through the limiting groove (74). An arc-shaped frame (75) is fixedly installed at the bottom of the fixed tooth plate (69). The welding frame (20) has a cleaning seat (76) fixedly installed at one end away from the rotating push plate (23), and the cleaning seat (76) has several cleaning nozzles (77) evenly installed on one side near the welding gun head (43). The bottom of the cleaning cylinder (70) is provided with an air inlet pipe (78) and an air outlet pipe (79), and the air outlet pipe (79) is connected to the cleaning seat (76).

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