Automatic welding equipment for bus shelter frame

Abstract

The application discloses a kind of automatic welding equipment for bus shelter frame, belong to the field of machining and welding, including welding part and positioning part;The positioning part includes support, overturning table is rotatably connected on support, overturning drive part is fixed on support and is used to drive overturning table rotation, a plurality of pressure parts are fixed on the side of overturning table for frame pressure, a plurality of hollow relief grooves are opened on overturning table and correspond to welding area respectively;A plurality of relief components are further connected on the side of overturning table;The present scheme is provided with relief component, by driving limit piece rotation and embedding gap between workpiece groups, originally closed weld space is changed into open structure with specific opening, and preset low-resistance lateral escape path is provided for high-pressure zinc vapor;Physical exhaust port is established in spot welding stage, and the tendency of zinc layer gathered in deep weld due to heat vaporization is alleviated, which helps to reduce the explosion phenomenon caused by pressure mutation during formal welding.

Description

Technical Field

[0001] This invention relates to the fields of machining and welding, and more specifically, to an automatic welding device for bus shelter frames. Background Technology

[0002] The bus shelter frame is the "skeleton" or "main structure" of the bus shelter. It is the cornerstone of the entire bus shelter's physical form, determining its appearance, size, and structural strength. It typically includes columns (for supporting vertical loads), beams (connecting the columns and maintaining balance), a roof beam (for supporting the roof structure), and various connecting fasteners.

[0003] Because bus shelters are exposed to the elements for extended periods, their frames are mostly made of galvanized steel. This material provides corrosion protection through its zinc coating, effectively extending the shelter's lifespan. However, automated welding of this type of material has always faced significant technological challenges. Zinc's melting point (approximately 420°C) is significantly lower than that of steel (approximately 1500°C), causing the zinc layer to vaporize rapidly and instantaneously under the high temperatures of welding.

[0004] In existing automated welding production, the assembly of workpieces typically aims for a tight fit, which leads to the vaporized zinc vapor being easily trapped deep within the weld and unable to escape in time. As the welding heat input continues to increase, the accumulated positive pressure often breaks through the molten pool, causing metal spatter, or forming deep pores after cooling and solidification. These defects not only weaken the load-bearing capacity of the bus shelter frame but may also lead to weld embrittlement. Although some equipment attempts to improve this by adjusting the welding current or speed, the lack of a physical path design for vapor emission and dynamic intervention methods for the internal pressure of the molten pool makes it difficult to fundamentally balance venting efficiency and weld formation quality. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide an automatic welding equipment for bus shelter frames.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] An automatic welding device for bus shelter frames includes a welding section and a positioning section; The positioning part includes a support, a flipping table rotatably connected to the support, a flipping drive part fixed to the support and used to drive the flipping table to rotate, multiple clamping parts fixed to one side of the flipping table for pressing the frame, and multiple hollowed-out clearance grooves opened on the flipping table and corresponding to the welding area respectively. The tilting platform is also connected to a number of pressure relief components. Each group of pressure relief components consists of two components and is symmetrically arranged on one side of the tilting platform. The pressure relief component includes a support block fixed to one side of the tilting platform, a limiting plate rotatably connected to one side of the support block, and a drive component disposed inside the support block and the tilting platform and connected to the limiting plate for driving the limiting plate to rotate. A number of first motors connected to the multiple drive components are fixed to the outside of the tilting platform.

[0008] Furthermore, the drive assembly includes a rotating rod rotatably connected inside the tilting table, a first synchronous wheel fixed to the outside of the rotating rod, a hollow column rotatably connected inside the support block and fixed at one end to one side of the limiting plate, a second synchronous wheel fixed to the outside of the hollow column, and a synchronous belt connecting the first synchronous wheel and the second synchronous wheel. The output shaft of the first motor is fixed to one end of the rotating rod.

[0009] Furthermore, the two symmetrically arranged limiting plates in the single pressure relief assembly rotate and enter between two adjacent workpieces, creating a gap between the two adjacent workpieces that facilitates the discharge of expanded zinc vapor.

[0010] Furthermore, it also includes multiple negative pressure fumigation components. The negative pressure fumigation components include a flow channel opened inside the limiting plate, a rotary joint fixed to one side of the support block, a top plate fixed to the upper end of the support block, and a pump body fixed to the upper end of the top plate. The input end of the pump body is connected to the output end of the rotary joint. The inner tube of the rotary joint passes through the support block and is fixedly inserted into the hollow cavity of the hollow column. The hollow cavity inside the hollow column is connected to the flow channel.

[0011] Furthermore, one side of the tilting table is integrally formed with multiple limiting flanges for positioning the workpiece.

[0012] Furthermore, the welding unit includes a robot, a welding torch fixed to the free end of the robot, a nozzle fixed to the end of the welding torch, a wire feeder fixed to the outside of the robot arm and connected to the welding torch, and an electromagnetic flow control assembly connected to the outside of the nozzle.

[0013] Furthermore, the electromagnetic flow control assembly includes an insulating and heat-insulating sleeve connected to the outside of the nozzle, an excitation coil fixed to the outside of the insulating and heat-insulating sleeve, a magnetic ring fixed to the outside of the insulating and heat-insulating sleeve and wrapped around the outside of the excitation coil, and a heat-insulating sleeve fixed to the outside of the magnetic ring. A power source is fixed to the rear side of the robot's free end, and the power source is electrically connected to the excitation coil.

[0014] Furthermore, the excitation coil is a hollow copper tube, and two cooling interfaces are fixed to both ends of the hollow copper tube. The two cooling interfaces pass through the magnetic ring and extend outward. A cooling section and a circulation pump are fixed to the outside of the robot's free end, and the output end and input end of the circulation pump both pass through the cooling section and extend outward. The extended ends of the output end and input end of the circulation pump are respectively connected to the two cooling interfaces through two pipes.

[0015] Furthermore, it also includes an adjustment assembly for adjusting the position of the insulating and heat-insulating sleeve. The adjustment assembly includes two guide grooves symmetrically opened on the outside of the nozzle, two guide posts respectively fixed to the inner walls of the two guide grooves, two springs respectively sleeved on the outside of the two guide posts, a guide flange integrally formed on the inner wall of the insulating and heat-insulating sleeve and slidably connected in the two guide grooves, a traction assembly connected to the free end of the robot and connected to one side of the insulating and heat-insulating sleeve, and two rotating rollers rotatably connected to the outer wall of the nozzle. The two ends of the springs are respectively connected to the guide groove and one side of the insulating and heat-insulating sleeve.

[0016] Furthermore, the traction assembly includes two side plates symmetrically fixed to one side of the robot's free end, a winding wheel rotatably connected between the two side plates, a second motor fixed to one side of one of the side plates, and a traction part with one end fixed to the outside of the winding wheel and the other end fixed to one side of the insulating and heat-insulating sleeve. The output shaft of the second motor is connected to the winding wheel.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This solution is equipped with a pressure relief component. By driving the limit plate to rotate and embedding it into the gap of the workpiece assembly, the originally closed weld space is transformed into an open structure with a specific opening degree, providing a preset low-resistance lateral escape path for high-pressure zinc vapor. Physical exhaust ports are established in the spot welding stage, which alleviates the tendency of the heated and vaporized zinc layer to accumulate in the depth of the weld and helps to reduce the bursting phenomenon caused by pressure change during formal welding.

[0018] (2) This scheme is equipped with a negative pressure fumigation component. Based on the physical path provided by the pressure relief component, the negative pressure generated by the flow channel actively induces zinc vapor to deviate from the direction of the molten pool, further reducing the probability of vapor forming pores through the liquid metal. The negative pressure intensity in the flow channel is adjusted by the pump body to make its pressure slightly lower than atmospheric pressure, guiding zinc vapor to be discharged without interfering with the protective airflow field, which helps to maintain the stability of the arc combustion environment. At the same time, the circulation of airflow in the flow channel plays a certain role in convective heat transfer on the limiting plate, which helps to extend the service life of the limiting component in the high-temperature welding environment.

[0019] (3) This scheme is equipped with an electromagnetic flow control component, which uses Lorentz force to drive the electric arc to rotate at high speed. The resulting stirring pressure head can reduce the surface tension of the liquid metal, providing the power support for the rapid rise and escape of the deep residual zinc vapor. The periodic electromagnetic stirring guides the transformation of coarse columnar crystals into fine equiaxed crystals through the mechanical crushing effect on dendrites, which helps to improve the impact toughness and mechanical strength of the weld.

[0020] (4) This scheme is equipped with an adjustment component. The axial position of the electromagnetic module is adjusted by the second motor and the traction component, which realizes the process matching of magnetic field strength distribution with workpieces of different wall thicknesses and reduces the risk of molten pool edge collapse during thin plate welding. The distance between the excitation coil and the weld is flexibly adjusted according to the real-time welding feedback, which helps to obtain a smoother surface forming quality while ensuring the basic degassing effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the positioning part structure of the present invention; Figure 3 This is a schematic diagram of the support block, limiting piece, and first motor structure of the present invention; Figure 4 This is a schematic diagram of the pressure relief assembly and negative pressure smoke extraction assembly of the present invention; Figure 5 This is a schematic diagram of the second synchronous wheel and flow channel structure of the present invention; Figure 6 This is a schematic diagram of the adjustment component structure of the present invention; Figure 7 This is a schematic diagram of the guide groove, guide post, and spring structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the electromagnetic current control component of the present invention; Figure 9 This is a cross-sectional view of the electromagnetic current control component of the present invention; Figure 10 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle; Figure 11 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B.

[0022] Explanation of the labels in the diagram: 1. Welding section; 11. Robot; 12. Welding torch; 13. Wire feeder; 14. Nozzle; 2. Positioning section; 21. Support; 22. Tilting table; 23. Tilting drive section; 24. Clamping section; 25. Limiting flange; 3. Pressure relief assembly; 31. Support block; 32. Limiting plate; 33. First motor; 34. Rotating rod; 35. First synchronous pulley; 36. Synchronous belt; 37. Hollow column; 38. Second synchronous pulley; 4. Negative pressure fume extraction assembly; 41. 42. Rotary joint; 43. Top plate; 44. Pump body; 5. Flow channel; 6. Electromagnetic flow control assembly; 51. Insulating and heat-insulating sleeve; 52. Excitation coil; 53. Magnetizing ring; 54. Heat-insulating sleeve; 55. Cooling interface; 56. Cooling section; 57. Circulating pump; 58. Guide flange; 6. Adjustment assembly; 61. Side plate; 62. Winding reel; 63. Second motor; 64. Traction section; 65. Rotating roller; 66. Guide groove; 67. Guide column; 68. Spring. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 11 An automatic welding device for bus shelter frames, comprising a welding section 1 and a positioning section 2; The positioning part 2 includes a support 21, a flipping table 22 rotatably connected to the support 21, a flipping drive part 23 fixed to the support 21 and used to drive the flipping table 22 to rotate, a plurality of pressing parts 24 fixed on one side of the flipping table 22 for pressing the frame, and a plurality of hollowed-out clearance grooves opened on the flipping table 22 and corresponding to the welding area respectively. Multiple pressure relief components 3 are also connected to one side of the flipping table 22. Each set of pressure relief components 3 consists of two components symmetrically arranged on one side of the flipping table 22. Each pressure relief component 3 includes a support block 31 fixed to one side of the flipping table 22, a limiting plate 32 rotatably connected to one side of the support block 31, and a drive component disposed inside the support block 31 and the flipping table 22 and connected to the limiting plate 32 for driving the limiting plate 32 to rotate. Multiple first motors 33 connected to multiple drive components are fixed to the outside of the flipping table 22.

[0025] The drive assembly includes a rotating rod 34 rotatably connected inside the tilting table 22, a first synchronous wheel 35 fixed to the outside of the rotating rod 34, a hollow column 37 rotatably connected inside the support block 31 and fixed at one end to one side of the limiting piece 32, a second synchronous wheel 38 fixed to the outside of the hollow column 37, and a synchronous belt 36 connecting the first synchronous wheel 35 and the second synchronous wheel 38. The output shaft of the first motor 33 is fixed to one end of the rotating rod 34.

[0026] The two limiting plates 32 symmetrically arranged in the single pressure relief assembly 3 rotate and enter between two adjacent workpieces, creating a gap between the two adjacent workpieces to facilitate the discharge of expanding zinc vapor.

[0027] The tilting table 22 also has a plurality of limiting flanges 25 integrally formed on one side for positioning the workpiece.

[0028] By adopting the above technical solution, two columns are placed on the tilting table 22, and the workpiece is pressed by the clamping part 24 so that one side of the workpiece is in close contact with the tilting table 22. The clamping part 24 can be an automatic clamping scheme combining an electric push rod and a pressure seat, or a manual clamping scheme using a clamping device. Then, the crossbeam or top beam is placed on the tilting table 22. One side of the top beam is used to weld to one end of the two columns, and the two ends of the crossbeam are respectively welded to the opposite sides of the two columns. Before welding, the first motor 33 is controlled to work and drive the rotating rod 34 and the first synchronous wheel 35 to rotate. The rotation of the first synchronous wheel 35 drives the second synchronous wheel 38 and the hollow column 37 to rotate through the synchronous belt 36. The rotation of the hollow column 37 can drive the limiting plate 32 to rotate, so that the limiting plate 32 rotates and enters between the end of the crossbeam and the side wall of the column, and between the end of the column and the side wall of the top beam. The thickness of the limiting plate is usually set to 0.5mm-2mm.

[0029] Since most bus shelter frames currently use galvanized steel to extend their lifespan, and zinc's melting point (approximately 420°C) is much lower than steel's melting point (approximately 1500°C), during automated welding, the high temperature causes zinc to vaporize instantly. During workpiece assembly, zinc vapor can become trapped deep within the weld, resulting in either ejection (spattering) or remaining inside (porosity). In contrast, this application uses a limiting plate 32 to forcibly create a gap before welding the connection between two adjacent workpieces, providing a low-resistance lateral venting path for the expanding zinc vapor. The vapor is no longer forced through the molten pool, thereby reducing porosity and spatter.

[0030] After the limiting plate 32 rotates into the space between two adjacent workpieces, the connection between the two workpieces is fixed by spot welding through the welding part 1. This allows for large-area spot welding. Only a gap that is not welded needs to be reserved in the area where the limiting plate 32 rotates and resets. After spot welding is completed, the limiting plate 32 is rotated and reset. Then, the formal welding is carried out. Since there is still a gap between the two adjacent workpieces when spot welding is performed, the gap can also provide a lateral exhaust path for the expanding zinc vapor during the subsequent formal welding, thereby ensuring welding stability.

[0031] The welding unit 1 is a welding robot in the prior art. The flipping drive unit 23 of this application can drive the flipping table 22 to rotate, thereby flipping the flipping table 22 so that the workpiece positioned on one side of the flipping table 22 can also be flipped. After the flipping table 22 is flipped, the welding unit 1 can perform welding on the other side of the workpiece through the hollowed-out clearance groove opened on the flipping table 22.

[0032] like Figure 4 and Figure 5 As shown, it also includes multiple negative pressure smoking components 4. The negative pressure smoking components 4 include a flow channel 44 opened inside the limiting plate 32, a rotary joint 41 fixed to one side of the support block 31, a top plate 42 fixed to the upper end of the support block 31, and a pump body 43 fixed to the upper end of the top plate 42. The input end of the pump body 43 is connected to the output end of the rotary joint 41. The inner tube of the rotary joint 41 passes through the support block 31 and is fixedly inserted into the hollow cavity of the hollow column 37. The hollow cavity inside the hollow column 37 is connected to the flow channel 44.

[0033] By adopting the above technical solution, the pump body 43 can be a vacuum pump. The operation of the pump body 43 can generate negative pressure inside the rotary joint 41, the hollow column 37, and the flow channel 44. The negative pressure generated in the flow channel 44 can draw zinc vapor in the gap. During large-area spot welding, the zinc vapor in the gap will be attracted by a magnet and discharged along the flow channel 44 of the limiting plate 32. Since the airflow direction is away from the molten pool, the formation of deep pores can be avoided. At the same time, by adjusting the negative pressure intensity in the flow channel through the pump body 43, the pressure is made slightly lower than atmospheric pressure (e.g., -10Pa to -50Pa). Under the premise of not interfering with the protective airflow field, the zinc vapor is guided to be discharged. Even if the zinc layer vaporizes violently, the negative pressure can balance the gap pressure, allowing the molten metal droplets to transition in a stable environment. In actual use, the flow channel 44 is backflushed and cleaned regularly to avoid blockage.

[0034] like Figures 6 to 9As shown, the welding unit 1 includes a robot 11, a welding torch 12 fixed to the free end of the robot 11, a nozzle 14 fixed to the end of the welding torch 12, a wire feeder 13 fixed to the outside of the robot 11 arm and connected to the welding torch 12, and an electromagnetic flow control assembly 5 connected to the outside of the nozzle 14.

[0035] The electromagnetic flow control assembly 5 includes an insulating and heat-insulating sleeve 51 connected to the outside of the nozzle 14, an excitation coil 52 fixed to the outside of the insulating and heat-insulating sleeve 51, a magnetic ring 53 fixed to the outside of the insulating and heat-insulating sleeve 51 and wrapped around the outside of the excitation coil 52, and a heat-insulating sleeve 54 fixed to the outside of the magnetic ring 53. A power supply is fixed to the rear side of the free end of the robot 11, and the power supply is electrically connected to the excitation coil 52.

[0036] The excitation coil 52 is a hollow copper tube, and two cooling interfaces 55 are fixed to both ends of the hollow copper tube. The two cooling interfaces 55 pass through the magnetic ring 53 and extend outward. A cooling section 56 and a circulation pump 57 are fixed to the outside of the free end of the robot 11. The output end and the input end of the circulation pump 57 both pass through the cooling section 56 and extend outward. The extended ends of the output end and the input end of the circulation pump 57 are respectively connected to the two cooling interfaces 55 through two pipes.

[0037] By adopting the above technical solution, the excitation coil 52 is made of hollow copper tube; the magnetic ring 53 (usually made of high permeability material such as permalloy or soft magnetic ferrite) provides a low magnetic resistance channel for the magnetic lines of force, which is used to guide the magnetic lines of force through the center of the nozzle 14 and improve the magnetic field efficiency; the insulating and heat-insulating sleeve 51 is installed between the nozzle 14 and the excitation coil 52, and is made of high-strength ceramic (such as silicon nitride or alumina) to prevent welding spatter from burning the coil and to isolate the radiant heat of the arc flame; the power supply is a programmable power module that supports DC, AC or pulse output; When the welding current (arc) is ejected from the nozzle 14, it passes through the magnetic field generated by the electromagnetic current control component 5. Although the axis of the excitation coil 52 is parallel to the welding wire, the magnetic field lines will undergo severe radial deflection (outward diffusion) at the opening. This radial magnetic field component interacts with the longitudinal welding current to generate a tangential force, forcing the arc to rotate at high speed around the axis, thereby achieving Lorentz force drive. By adjusting the frequency of the current in the excitation coil 52 (10-50Hz), a wave-like edge overflow effect is generated in the molten pool. The stirring force generated by the Lorentz force, the centrifugal force generated by the rotating arc, and the stirring of the molten pool metal to generate circulation reduce the surface tension of the molten pool liquid metal. Through the centrifugal stirring effect, the zinc vapor remaining at the bottom of the molten pool is forced to float up and escape from the gap, thereby solving the porosity problem in the welding of galvanized sheets. At the same time, the periodic electromagnetic stirring can also improve the weld toughness by mechanically breaking the dendrites, transforming the coarse columnar crystals into fine equiaxed crystals.

[0038] Industrial coolant flows inside the excitation coil 52 (hollow copper tube). The circulation pump 57 enables the coolant to circulate within the pipe (not shown in the accompanying drawings of this application) and the excitation coil 52. The cooling section 56 can cool the output and input extensions (made of thermally conductive material) of the circulation pump 57. The cooling section 56 can use different cooling methods such as air cooling, water cooling, and semiconductor refrigeration to cool the extensions. When the coolant in the pipe passes through the output and input extensions of the circulation pump 57, it can cool the coolant and ensure the stability of the excitation coil 52 operation.

[0039] like Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, it also includes an adjustment assembly 6 for adjusting the position of the insulating and heat-insulating sleeve 51. The adjustment assembly 6 includes two guide grooves 66 symmetrically opened on the outside of the nozzle 14, two guide posts 67 respectively fixed to the inner walls of the two guide grooves 66, two springs 68 respectively sleeved on the outside of the two guide posts 67, a guide flange 58 integrally formed on the inner wall of the insulating and heat-insulating sleeve 51 and slidably connected in the two guide grooves 66, a traction assembly connected to the free end of the robot 11 and connected to one side of the insulating and heat-insulating sleeve 51, and two rotating rollers 65 rotatably connected to the outer wall of the nozzle 14. The two ends of the springs 68 are respectively connected to the guide grooves 66 and one side of the insulating and heat-insulating sleeve 51.

[0040] The traction assembly includes two side plates 61 symmetrically fixed to one side of the free end of the robot 11, a take-up wheel 62 rotatably connected between the two side plates 61, a second motor 63 fixed to one side of one of the side plates 61, and a traction part 64 with one end fixed to the outside of the take-up wheel 62 and the other end fixed to one side of the insulating and heat-insulating sleeve 51. The output shaft of the second motor 63 is connected to the take-up wheel 62.

[0041] By adopting the above technical solution, the second motor 63 can be controlled to drive the winding wheel 62 to rotate. The rotation of the winding wheel 62 can wind up the traction part 64. The traction part 64 can be a combination of metal wire rope and ceramic heat insulation sleeve. When winding up the traction part 64, the traction part 64 can pull the insulating heat insulation sleeve 51, the magnetic ring 53 and the excitation coil 52 to move outside the nozzle 14, thereby moving the excitation coil 52 away from the weld seam and reducing the direct impact on the molten pool. It is suitable for thin plates, materials that are easy to burn through or joints that are sensitive to undercut. The backward sliding module can reduce the risk of molten pool edge collapse (undercut) caused by excessive magnetic force. The magnetic field becomes more gentle, and while ensuring the basic degassing effect, a smoother weld seam is obtained.

[0042] Usage: The workpiece is automatically positioned and multi-sided welded by the flipping table 22 of the positioning unit 2 and the clamping unit 24. Before welding, the limiting plate 32 of the pressure relief component 3 is used to forcibly create a small gap at the joint of the workpiece, and the high-temperature vaporized zinc vapor is extracted by the negative pressure fumigation component 4, which effectively solves the common problems of porosity and spatter in the welding of galvanized sheets. At the same time, the electromagnetic current control component 5 mounted on the welding unit 1 uses the magnetic field generated by the excitation coil 52 to drive the arc to rotate at high speed. The electromagnetic stirring effect reduces the surface tension of the molten pool and assists the rapid escape of deep zinc vapor. With the help of the adjustment component 6 to dynamically optimize the position of the magnetic field, high-quality automated welding of the bus shelter frame is achieved.

[0043] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An automatic welding device for bus shelter frames, comprising a welding part (1) and a positioning part (2), characterized in that: The positioning part (2) includes a support (21), a flipping table (22) rotatably connected to the support (21), a flipping drive part (23) fixed to the support (21) and used to drive the flipping table (22) to rotate, a plurality of pressing parts (24) fixed on one side of the flipping table (22) for pressing the frame, and a plurality of hollowed-out clearance grooves opened on the flipping table (22) and corresponding to the welding area respectively; The flipping platform (22) is also connected to a number of pressure relief components (3) on one side. Each set of pressure relief components (3) consists of two components and is symmetrically arranged on one side of the flipping platform (22). The pressure relief component (3) includes a support block (31) fixed to one side of the flipping platform (22), a limiting plate (32) rotatably connected to one side of the support block (31), and a drive component disposed inside the support block (31) and the flipping platform (22) and connected to the limiting plate (32) for driving the limiting plate (32) to rotate. The flipping platform (22) is fixed to a number of first motors (33) connected to the multiple drive components on the outside.

2. The automatic welding equipment for bus shelter frames according to claim 1, characterized in that: The drive assembly includes a rotating rod (34) rotatably connected inside the tilting table (22), a first synchronous wheel (35) fixed to the outside of the rotating rod (34), a hollow column (37) rotatably connected inside the support block (31) and fixed at one end to one side of the limiting piece (32), a second synchronous wheel (38) fixed to the outside of the hollow column (37), and a synchronous belt (36) connecting the first synchronous wheel (35) and the second synchronous wheel (38). The output shaft of the first motor (33) is fixed to one end of the rotating rod (34).

3. The automatic welding equipment for bus shelter frames according to claim 1, characterized in that: The two limiting plates (32) symmetrically arranged in the single pressure relief assembly (3) rotate and enter between two adjacent workpieces or rotate out from the gap between two adjacent workpieces after welding, so as to create a gap between the two adjacent workpieces that facilitates the discharge of expanding zinc vapor.

4. The automatic welding equipment for bus shelter frames according to claim 1, characterized in that: It also includes multiple negative pressure smoking components (4), each negative pressure smoking component (4) including a flow channel (44) opened inside the limiting piece (32), a rotary joint (41) fixed to one side of the support block (31), a top plate (42) fixed to the upper end of the support block (31), and a pump body (43) fixed to the upper end of the top plate (42). The input end of the pump body (43) is connected to the output end of the rotary joint (41). The inner tube of the rotary joint (41) passes through the support block (31) and is fixedly inserted into the hollow cavity of the hollow column (37). The hollow cavity inside the hollow column (37) is connected to the flow channel (44).

5. The automatic welding equipment for bus shelter frames according to claim 1, characterized in that: The flipping table (22) also has a plurality of limiting flanges (25) integrally formed on one side for positioning the workpiece.

6. The automatic welding equipment for bus shelter frames according to claim 1, characterized in that: The welding section (1) includes a robot (11), a welding torch (12) fixed on the free end of the robot (11), a nozzle (14) fixed to the end of the welding torch (12), a wire feeder (13) fixed to the outside of the robot (11) arm and connected to the welding torch (12), and an electromagnetic flow control assembly (5) connected to the outside of the nozzle (14).

7. The automatic welding equipment for bus shelter frames according to claim 6, characterized in that: The electromagnetic flow control assembly (5) includes an insulating and heat-insulating sleeve (51) connected to the outside of the nozzle (14), an excitation coil (52) fixed to the outside of the insulating and heat-insulating sleeve (51), a magnetic ring (53) fixed to the outside of the insulating and heat-insulating sleeve (51) and wrapped around the outside of the excitation coil (52), and a heat-insulating sleeve (54) fixed to the outside of the magnetic ring (53). A power supply is fixed to the rear side of the free end of the robot (11), and the power supply is electrically connected to the excitation coil (52).

8. The automatic welding equipment for bus shelter frames according to claim 7, characterized in that: The excitation coil (52) is a hollow copper tube, and two cooling interfaces (55) are fixed to both ends of the hollow copper tube. The two cooling interfaces (55) pass through the magnetic ring (53) and extend outward. The robot (11) has a cooling part (56) and a circulation pump (57) fixed to the outside of its free end. The output end and input end of the circulation pump (57) pass through the cooling part (56) and extend outward. The extended ends of the output end and input end of the circulation pump (57) are connected to the two cooling interfaces (55) through two pipes respectively.

9. An automatic welding equipment for a bus shelter frame according to claim 8, characterized in that: It also includes an adjustment assembly (6) for adjusting the position of the insulating heat insulation sleeve (51). The adjustment assembly (6) includes two guide grooves (66) symmetrically opened outside the nozzle (14), two guide posts (67) respectively fixed to the inner walls of the two guide grooves (66), two springs (68) respectively sleeved outside the two guide posts (67), a guide flange (58) integrally formed on the inner wall of the insulating heat insulation sleeve (51) and slidably connected in the two guide grooves (66), a traction assembly connected to the free end of the robot (11) and connected to one side of the insulating heat insulation sleeve (51), and two rotating rollers (65) rotatably connected to the outer wall of the nozzle (14). The two ends of the springs (68) are respectively connected to the guide grooves (66) and one side of the insulating heat insulation sleeve (51).

10. An automatic welding equipment for a bus shelter frame according to claim 9, characterized in that: The traction assembly includes two side plates (61) symmetrically fixed to one side of the free end of the robot (11), a winding wheel (62) rotatably connected between the two side plates (61), a second motor (63) fixed to one side of one of the side plates (61), and a traction part (64) with one end fixed to the outside of the winding wheel (62) and the other end fixed to one side of the insulating and heat-insulating sleeve (51). The output shaft of the second motor (63) is connected to the winding wheel (62).

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