Aluminum alloy pipe welding apparatus and welding method thereof

Abstract

The application is suitable for the technical field of aluminum alloy welding, and provides an aluminum alloy pipeline welding device and a welding method thereof.The device comprises a welding unit and a slow cooling unit.The welding unit comprises a support frame, a displacement air cylinder, a displacement sliding block, an electric telescopic rod, a rotary disc, a sliding rail, an electric sliding block, an adjusting piece and a welding gun.The slow cooling unit comprises a fixing plate, a fixing block, an expansion air cylinder, an expansion plate, an arc-shaped track, an electric arc block, a heating plate and an electric heating wire.The application divides the to-be-welded area of the aluminum alloy pipeline and the flange into four parts, and the to-be-welded area is not in contact with spot welding on the welding path of formal welding.The impurities on the surface of the spot welding area are polished by an angle grinder, and then the welding operation is continued, so that the strength and sealing performance of the weld are improved, and the welding quality of the welding position of the aluminum alloy pipeline and the flange is improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy welding technology, and more specifically, to an aluminum alloy pipe welding apparatus and welding method thereof. Background Technology

[0002] Aluminum alloy pipes are pipes made of aluminum alloy materials and are used to transport liquids, gases or other media. Due to their lightweight, corrosion resistance, good thermal conductivity and high strength, aluminum alloy pipes are widely used in many fields. Among them, welding is one of the important processes in the processing and installation of aluminum alloy pipes.

[0003] In existing technologies, the welding of aluminum alloy pipes requires selecting appropriate welding positions based on specific application scenarios. When welding aluminum alloy pipes to flanges, the aluminum alloy pipes and flanges must first be aligned to ensure that the center lines of the pipes and flanges are consistent. Then, clamps or spot welding are used to fix the pipes and flanges to prevent displacement during the welding process. Finally, continuous welding is performed using a welding torch, thereby achieving a reliable connection between the aluminum alloy pipes and flanges.

[0004] However, during the formal welding process, the welding path will overlap with the spot welding area. The spot welding area contains incompletely melted slag or oxides. When the formal welding is performed again, the impurities in the spot welding area will be wrapped in the weld, forming pores or slag inclusions, which will reduce the strength and sealing of the weld and thus affect the welding quality of the aluminum alloy pipe and flange.

[0005] Meanwhile, if the thermal stress in the spot welding area is not fully released before welding again, the thermal stress will concentrate in the spot welding area, resulting in welding deformation, affecting the shape and size of the weld, and being detrimental to the quality and efficiency of welding. To address this, an aluminum alloy pipe welding device and its welding method are proposed to improve the existing problems. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an aluminum alloy pipe welding device and welding method.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy pipe welding device, comprising a bearing unit, a welding unit, and a slow cooling unit; wherein, the bearing unit includes a bearing frame, a lifting cylinder disposed within the bearing frame, a lifting platform disposed at the telescopic end of the lifting cylinder, lifting plates symmetrically disposed at both ends of the lifting platform in the radial direction, pulleys symmetrically disposed within the lifting plates in the axial direction, a pressing cylinder symmetrically disposed on one side of the bearing frame in the radial direction, a pressing plate rotatably connected to the telescopic end of the pressing cylinder, and a vertical block rotatably connected to the side wall of the pressing plate; the end of the vertical block away from the pressing plate is connected to the top of the bearing frame; the welding unit is disposed at one end of the bearing frame, comprising a support frame, a displacement cylinder disposed on one side of the support frame, a displacement slider disposed at the telescopic end of the displacement cylinder, and a sliding block disposed at the telescopic end of the displacement cylinder. The block includes an electric telescopic rod on its side wall, a rotating disk rotatably connected to the telescopic end of the electric telescopic rod, slide rails evenly arranged on the side wall of the rotating disk in all directions, an electric slider sliding on the slide rails, an adjusting component located on the side of the electric slider away from the slide rails, and a welding torch located at one end of the adjusting component. The adjusting component can adjust the welding angle of the welding torch and can also rotate the angle of the welding torch in the opposite direction to reduce wire trailing. A slow cooling unit is located on one side of the adjusting component and includes a fixed plate, a fixed block located on the side wall of the fixed plate, a telescopic cylinder located at one end of the fixed block, a telescopic plate located at the telescopic end of the telescopic cylinder, an arc-shaped track symmetrically arranged within the telescopic plate, an electric arc block sliding on the arc-shaped track, a heating plate located on the side of the electric arc block away from the arc-shaped track, and an electric heating wire located on the side wall of the heating plate.

[0008] The present invention is further configured such that: a support plate is provided on the top of the support frame, and through slots are symmetrically provided on the top of the support plate in the radial direction, and the end of the lifting plate away from the lifting platform can pass through the corresponding through slots.

[0009] The invention is further configured such that: a placement groove is provided at the end of the lifting plate away from the lifting platform, the placement groove is arc-shaped, the pulleys are symmetrically distributed about the placement groove, and the two ends of the pulleys are rotatably connected to the corresponding inner wall of the lifting plate.

[0010] The present invention is further configured such that: a pressing groove is provided on the side wall of the pressing plate, the pressing groove is arc-shaped, and a rubber pad is provided inside the pressing groove.

[0011] The invention is further configured such that: a long track is provided on the side of the displacement slider away from the electric telescopic rod, the displacement slider can slide on the long track, and the side of the long track away from the displacement slider is connected to the side wall of the support frame; long plates are also symmetrically arranged in the radial direction on the side wall of the support frame near the displacement cylinder, and fixed pulleys are rotatably connected to both ends of the long plates, the outer ring of the rotating disk can be rolled and connected with the fixed pulleys, and a through hole is provided in the middle of the rotating disk.

[0012] The present invention is further configured such that: the adjusting component includes an extension plate, an adjusting motor disposed on one side of the extension plate, and an adjusting plate disposed at the output end of the adjusting motor; one side of the extension plate can be connected to the side wall of the electric slider away from the slide rail, the adjusting motor is located on the side of the extension plate close to the electric slider, the output end of the adjusting motor passes through the extension plate and is connected to the adjusting plate, and the welding torch is located at one end of the adjusting plate.

[0013] The invention is further configured such that: an arc-shaped plate is provided at the end of the adjusting plate away from the welding gun, and an angle value is provided on the arc-shaped plate; and a directional arrow is provided on the side wall of the extension plate near the adjusting plate, with one end of the directional arrow located at the angle value.

[0014] The invention is further configured such that: the side of the fixing plate away from the fixing block is connected to the side wall of the rotating disk near the slide rail; the telescopic end of the telescopic cylinder passes through the fixing block and is connected to the telescopic plate; the telescopic plate is arc-shaped; a cavity is provided inside the telescopic plate; and the cavity can pass through both ends of the telescopic plate.

[0015] The invention is further configured such that: the arc-shaped tracks are symmetrically distributed in the cavity, the heating plate is arc-shaped, a heating groove is formed on the side wall of the heating plate near the electric heating wire, the end face of the heating groove is inverted U-shaped, and the electric heating wire is located in the heating groove.

[0016] A method for welding aluminum alloy pipes, using the aluminum alloy pipe welding apparatus as described above, includes the following steps:

[0017] S1. Place the spot-welded aluminum alloy pipe on the support frame, so that the end spot-welded with the flange is close to the support frame. Then start the lifting cylinder, and its extension end pushes the lifting platform to move upward, so that the lifting plate and pulley move synchronously to lift the aluminum alloy pipe and make the aluminum alloy pipe at a height that is easy to weld.

[0018] S2. During the operation of S1, the pressing cylinder is activated at the same time. Its telescopic end pushes the pressing plate to rotate along the side wall of the upright block, so that the pressing plate is close to the aluminum alloy pipe, pressing the aluminum alloy pipe, and cooperating with the lifting plate to fix and clamp the aluminum alloy pipe.

[0019] S3. When welding aluminum alloy pipes and flanges, on the one hand, the electric slider is activated, driving the adjusting component and welding torch to slide along the opening direction of the slide rail, so that the welding torch is close to the welding point of the aluminum alloy pipe and flange and welds the point to be welded; on the other hand, the displacement cylinder is also activated, its telescopic end extends, pushing the displacement slider to slide, so that the electric telescopic rod is also moved synchronously, and pulls the rotating disk to rotate, so that the four welding torches can continuously weld in the corresponding welding area, and stop welding when they approach the spot welding area, without contacting the four spot welding areas.

[0020] S4. During the operation of S3, the electric telescopic rod is started. Its telescopic end will extend or retract as the rotating disk rotates and the distance between the rotating disk and the electric telescopic rod itself. The adjusting component can adjust the welding angle of the welding torch so that the welding torch always maintains the best welding tilt angle. At the same time, it can also rotate the angle of the welding torch in the opposite direction to reduce the tailing of the welding wire at the end of the welding.

[0021] S5. After the initial welding is completed, the spot welding area is ground with an angle grinder to remove impurities from the surface of the spot welding area. At this time, there is a gap between the spot welding area and the tail of the continuous welding. Then the telescopic cylinder is started, which moves the telescopic plate close to the spot welding area and the tail of the continuous welding to cover the two areas.

[0022] S6. During the operation of S5, the two electric arc blocks are also activated, driving the heating plate and electric heating wire to slide along the opening direction of the arc track, so that the two heating plates leave the inside of the telescopic plate and gradually unfold, so that one heating plate covers the spot welding area and the other heating plate covers the tail of the continuous welding, thereby achieving the purpose of heating and slowly cooling the corresponding area with the corresponding electric heating wire.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] (1) By dividing the areas to be welded between the aluminum alloy pipe and the flange, four areas are made to be welded separately, and the welding path of the formal welding does not come into contact with the spot welding. After the impurities on the surface of the spot welding area are ground off by an angle grinder, the welding operation is continued. This avoids the presence of incompletely melted slag or oxides in the spot welding area. When the formal welding is performed again, the impurities in the spot welding area will be wrapped in the weld, forming pores or slag inclusions. This improves the strength and sealing of the weld, thereby improving the welding quality of the aluminum alloy pipe and flange.

[0025] (2) By adjusting the welding angle of the welding torch, the welding torch can always maintain the best welding tilt angle. At the same time, the angle of the welding torch can be rotated in the opposite direction to reduce the tailing of the welding wire at the end of the welding, thereby ensuring the aesthetics of the weld and improving the performance of the welded joint.

[0026] (3) By simultaneously heating and slowly cooling the spot welding area and the tail of the formal welding, the tail of the formal welding is kept at a certain temperature to ensure the efficiency of subsequent welding; the spot welding area is cooled slowly, avoiding the problem that the thermal stress in the spot welding area is not fully released before welding again, which would cause the thermal stress to concentrate in the spot welding area, thus causing welding deformation. This ensures the shape and size of the weld, which is beneficial to the quality and efficiency of welding. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the aluminum alloy pipe welding device of the present invention.

[0028] Figure 2 This is a partial structural schematic diagram of the bearing unit in this invention.

[0029] Figure 3 This is a schematic diagram of another part of the structure of the bearing unit in this invention.

[0030] Figure 4 This is a schematic diagram of the overall structure of the welding unit in this invention.

[0031] Figure 5 This is a schematic diagram of the overall structure of the rotating disk and the perforation in this invention.

[0032] Figure 6 This is a schematic diagram of the overall structure of the adjusting component in this invention.

[0033] Figure 7 This is a schematic diagram of the overall structure of the slow cooling unit in this invention.

[0034] Figure 8 This is an exploded view of the slow cooling unit in this invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Bearing unit; 11. Bearing frame; 111. Bearing plate; 112. Through groove; 12. Lifting cylinder; 13. Lifting platform; 14. Lifting plate; 141. Placement groove; 15. Pulley; 16. Pressing cylinder; 17. Pressing plate; 171. Pressing groove; 172. Rubber pad; 18. Stand block;

[0036] 2. Welding unit; 21. Support frame; 211. Long plate; 212. Fixed pulley; 22. Displacement cylinder; 23. Displacement slider; 231. Long track; 24. Electric telescopic rod; 25. Rotary disk; 251. Perforation; 26. Slide rail; 27. Electric slider; 28. Adjusting component; 281. Extension plate; 282. Adjusting motor; 283. Adjusting plate; 284. Arc plate; 285. Angle value; 286. Pointing arrow; 29. ​​Welding torch;

[0037] 3. Slow cooling unit; 31. Fixing plate; 32. Fixing block; 33. Telescopic cylinder; 34. Telescopic plate; 341. Cavity; 35. Arc track; 36. Electric arc block; 37. Heating plate; 371. Heating groove; 38. Electric heating wire. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0039] Please see Figures 1-8 The present invention provides the following technical solutions:

[0040] Example 1, see Figures 1-8 An aluminum alloy pipe welding device includes a bearing unit 1, a welding unit 2, and a slow cooling unit 3. The bearing unit 1 can both support the aluminum alloy pipe to ensure that the center line of the pipe is aligned with that of the flange, and fix and clamp the aluminum alloy pipe to prevent displacement during the welding process, thereby achieving a reliable connection between the aluminum alloy pipe and the flange.

[0041] The main purpose of welding unit 2 is, on the one hand, to divide the areas to be welded between the aluminum alloy pipe and the flange into four separate areas, and to ensure that these areas do not come into contact with the spot welds on the formal welding path. After the impurities on the surface of the spot weld area are ground off by an angle grinder, the welding operation continues. This avoids the presence of incompletely melted slag or oxides in the spot weld area, which would otherwise be trapped in the weld during the subsequent formal welding, causing porosity or slag inclusions. This improves the strength and sealing of the weld, thereby enhancing the welding quality of the aluminum alloy pipe and flange joint.

[0042] On the other hand, the welding angle of the welding torch 29 can be adjusted so that the welding torch 29 always maintains the optimal welding tilt angle. At the same time, the angle of the welding torch 29 can be rotated in the opposite direction to reduce the tailing of the welding wire at the end of the weld, thereby ensuring the aesthetics of the weld and improving the performance of the welded joint.

[0043] The function of the slow cooling unit 3 is to simultaneously heat and slow cool the spot welding area and the tail of the formal welding, so that the tail of the formal welding maintains a certain amount of heat to ensure the efficiency of subsequent welding; and to allow the spot welding area to cool slowly, so as to avoid the problem of thermal stress being concentrated in the spot welding area and thus welding deformation if welding is carried out again before the thermal stress in the spot welding area is fully released. This ensures the shape and size of the weld and is beneficial to the quality and efficiency of welding.

[0044] See Figures 1-3Specifically, the bearing unit 1 includes a bearing frame 11, a lifting cylinder 12 disposed within the bearing frame 11, a lifting platform 13 disposed at the extension end of the lifting cylinder 12, lifting plates 14 symmetrically disposed at both ends of the lifting platform 13 in the radial N direction, pulleys 15 symmetrically disposed within the lifting plates 14 in the axial M direction, a pressing cylinder 16 symmetrically disposed on one side of the bearing frame 11 in the radial N direction, a pressing plate 17 rotatably connected to the extension end of the pressing cylinder 16, and a vertical block 18 rotatably connected to the side wall of the pressing plate 17; the end of the vertical block 18 away from the pressing plate 17 is connected to the top of the bearing frame 11.

[0045] First, the spot-welded aluminum alloy pipe is placed on the support frame 11, so that the end spot-welded with the flange is close to the support frame 21. Then, the lifting cylinder 12 is activated, and its telescopic end pushes the lifting platform 13 to move upward, so that the lifting plate 14 and the pulley 15 move synchronously, lifting the aluminum alloy pipe and placing it at a height that is easy to weld.

[0046] During this process, the pressing cylinder 16 is activated simultaneously, and its telescopic end pushes the pressing plate 17 to rotate along the side wall of the upright block 18, so that the pressing plate 17 approaches the aluminum alloy pipe, presses the aluminum alloy pipe, and cooperates with the lifting plate 14 to fix and clamp the aluminum alloy pipe, thereby realizing a reliable connection between the aluminum alloy pipe and the flange.

[0047] See Figures 4-6 Specifically, welding unit 2 is located at one end of the support frame 11, and includes a support frame 21, a displacement cylinder 22 located on one side of the support frame 21, a displacement slider 23 located at the telescopic end of the displacement cylinder 22, an electric telescopic rod 24 located on the side wall of the displacement slider 23, a rotating disk 25 rotatably connected to the telescopic end of the electric telescopic rod 24, slide rails 26 evenly arranged on the side wall of the rotating disk 25 in all directions, an electric slider 27 sliding on the slide rails 26, an adjusting member 28 located on the side of the electric slider 27 away from the slide rails 26, and a welding torch 29 located at one end of the adjusting member 28; the adjusting member 28 can adjust the welding angle of the welding torch 29, and can also rotate the angle of the welding torch 29 in the opposite direction to reduce wire trailing.

[0048] When welding aluminum alloy pipes and flanges, on the one hand, the electric slider 27 is activated, driving the adjusting component 28 and the welding torch 29 to slide along the opening direction of the slide rail 26, so that the welding torch 29 approaches the welding point of the aluminum alloy pipe and flange and welds the area to be welded; on the other hand, the displacement cylinder 22 is also activated, its telescopic end extends, pushing the displacement slider 23 to slide, so that the electric telescopic rod 24 also moves synchronously, pulling the rotating disk 25 to rotate, so that the four welding torches 29 can continuously weld in the corresponding welding area, stop welding when approaching the spot welding area, and not contact the four spot welding areas. After the impurities on the surface of the spot welding area are ground off by an angle grinder, the welding operation continues, thus avoiding the presence of incompletely melted slag or oxides in the spot welding area. When welding is formally performed again, the impurities in the spot welding area will be wrapped in the weld, forming porosity or slag inclusions, thereby improving the strength and sealing of the weld, and thus improving the welding quality of the aluminum alloy pipe and flange joint.

[0049] During this process, the electric telescopic rod 24 is activated, and its telescopic end extends or retracts as the rotating disk 25 rotates and the distance between the rotating disk 25 and the electric telescopic rod 24 itself increases. The adjusting component 28 can adjust the welding angle of the welding torch 29 so that the welding torch 29 always maintains the optimal welding tilt angle. At the same time, it can also rotate the angle of the welding torch 29 in the opposite direction to reduce the tailing of the welding wire at the end of the weld, thereby ensuring the aesthetics of the weld and improving the performance of the welded joint.

[0050] See Figures 7-8 Specifically, the slow cooling unit 3 is located on one side of the adjusting member 28 and includes a fixed plate 31, a fixed block 32 located on the side wall of the fixed plate 31, a telescopic cylinder 33 located at one end of the fixed block 32, a telescopic plate 34 located at the telescopic end of the telescopic cylinder 33, an arc-shaped track 35 symmetrically arranged in the telescopic plate 34, an electric arc block 36 sliding on the arc-shaped track 35, a heating plate 37 located on the side of the electric arc block 36 away from the arc-shaped track 35, and an electric heating wire 38 located on the side wall of the heating plate 37.

[0051] After the initial welding is completed, there is a gap between the spot welding area and the tail of the continuous welding. Then, the telescopic cylinder 33 is activated, which moves the telescopic plate 34 closer to the spot welding area and the tail of the continuous welding, covering both areas. During this process, the two electric arc blocks 36 are also activated, which move the heating plate 37 and the electric heating wire 38 along the opening direction of the arc track 35, so that the two heating plates 37 leave the inside of the telescopic plate 34 and gradually unfold. Thus, one heating plate 37 covers the spot welding area, and the other heating plate 37 covers the tail of the continuous welding. This allows the corresponding electric heating wire 38 to heat and slowly cool the corresponding area. This keeps the tail of the formal welding at a certain temperature to ensure the efficiency of subsequent welding. It also allows the spot welding area to cool slowly, avoiding the problem of heat stress concentration in the spot welding area and welding deformation caused by welding before the heat stress in the spot welding area is fully released. This ensures the shape and size of the weld, which is beneficial to the quality and efficiency of welding.

[0052] See Figures 1-3 Furthermore, a support plate 111 is provided on the top of the support frame 11, and through slots 112 are symmetrically provided on the top of the support plate 111 in the radial N direction. The end of the lifting plate 14 away from the lifting platform 13 can pass through the corresponding through slots 112.

[0053] See Figures 1-3 Furthermore, the lifting plate 14 is provided with a placement groove 141 at the end away from the lifting platform 13. The placement groove 141 is arc-shaped, and the pulleys 15 are symmetrically distributed about the placement groove 141. The two ends of the pulleys 15 are rotatably connected to the corresponding inner wall of the lifting plate 14. The side wall of the pressing plate 17 is provided with a pressing groove 171. The pressing groove 171 is arc-shaped, and a rubber pad 172 is provided inside the pressing groove 171.

[0054] The design of the through groove 112 ensures that when the lifting platform 13 moves upward, the two lifting plates 14 can only move upward along the corresponding through groove 112, thus achieving the purpose of guidance.

[0055] When the pressing plate 17 rotates, the pressing groove 171 gradually approaches the outer wall of the aluminum alloy pipe and fits tightly against the outer wall of the aluminum alloy pipe. At the same time, the rubber pad 172 also firmly squeezes the outer wall of the aluminum alloy pipe, thereby ensuring the stability of the aluminum alloy pipe.

[0056] See Figures 4-5Furthermore, a long track 231 is provided on the side of the displacement slider 23 away from the electric telescopic rod 24, and the displacement slider 23 can slide on the long track 231. The side of the long track 231 away from the displacement slider 23 is connected to the side wall of the support frame 21. A long plate 211 is also symmetrically arranged in the radial N direction on the side wall of the support frame 21 near the displacement cylinder 22. Fixed pulleys 212 are rotatably connected to both ends of the long plate 211. The outer ring of the rotating disk 25 can be rolled and connected with the fixed pulleys 212. A through hole 251 is opened in the middle of the rotating disk 25.

[0057] When the displacement cylinder 22 is activated, it will push the displacement slider 23 to slide on the long track 231, causing the electric telescopic rod 24 to move synchronously and pull the rotating disk 25 to rotate. During this process, the four fixed pulleys 212 will also rotate, and the four fixed pulleys 212 will also play a supporting and guiding role.

[0058] It should be noted that the diameter of the perforation 251 is larger than that of the flange and the aluminum alloy pipe, so the end of the aluminum alloy pipe that is spot-welded to the flange can be placed through the perforation 251.

[0059] See Figure 6 Furthermore, the adjusting component 28 includes an extension plate 281, an adjusting motor 282 disposed on one side of the extension plate 281, and an adjusting plate 283 disposed at the output end of the adjusting motor 282; one side of the extension plate 281 can be connected to the side wall of the electric slider 27 away from the slide rail 26, the adjusting motor 282 is located on the side of the extension plate 281 close to the electric slider 27, the output end of the adjusting motor 282 passes through the extension plate 281 and is connected to the adjusting plate 283, and the welding torch 29 is located at one end of the adjusting plate 283.

[0060] During the welding process, when the welding torch 29 approaches the welding point between the aluminum alloy pipe and the flange, the adjusting motor 282 starts, driving the adjusting plate 283 to rotate. This allows the adjusting plate 283 to drive the welding torch 29 to rotate synchronously, positioning the welding torch 29 at the optimal welding tilt angle. As the rotating disk 25 rotates, the tilt angle of the welding torch 29 is continuously adjusted to ensure that the welding torch 29 always maintains the optimal welding tilt angle, thereby improving the welding quality.

[0061] When the welding torch 29 reaches the tail end, that is, when it is close to the spot welding area, the adjusting motor 282 starts, driving the adjusting plate 283 and the welding torch 29 to rotate in the opposite direction. This allows the welding wire at the tail end to be quickly broken, reducing the trailing of the welding wire at the end of the weld, thus ensuring the aesthetics of the weld and improving the performance of the welded joint.

[0062] See Figure 6Furthermore, an arc-shaped plate 284 is provided at the end of the adjustment plate 283 away from the welding gun 29, and an angle value 285 is provided on the arc-shaped plate 284. An arrow 286 is also provided on the side wall of the extension plate 281 near the adjustment plate 283, and one end of the arrow 286 is located on the angle value 285.

[0063] During the rotation of the adjustment plate 283, the angle value 285 will also change, and the pointing arrow 286 will point to the value of the tilt angle of the welding gun 29. The angle value 285 generally includes 0 to 90 degrees and 0 to -20 degrees. By observing the angle value pointed to by the pointing arrow 286, the value of the tilt angle of the welding gun 29 can be known.

[0064] Example 2: While the technical solution of Example 1 solves the problems of incompletely melted weld slag or oxides in the spot weld area, which can lead to impurities in the spot weld area being trapped in the weld during subsequent formal welding, forming porosity or slag inclusions, and the presence of welding wire at the weld tail, it still does not solve the problem of incomplete thermal stress release in the spot weld area before re-welding, which can cause thermal stress concentration in the spot weld area and thus weld deformation. Therefore, the following solution is proposed:

[0065] See Figures 7-8 Furthermore, the side of the fixed plate 31 away from the fixed block 32 is connected to the side wall of the rotating disk 25 near the slide rail 26. The telescopic end of the telescopic cylinder 33 passes through the fixed block 32 and is connected to the telescopic plate 34. The telescopic plate 34 is arc-shaped and has a cavity 341 inside. The cavity 341 can pass through both ends of the telescopic plate 34.

[0066] See Figures 7-8 Furthermore, the arc-shaped tracks 35 are symmetrically distributed in the cavity 341, the heating plate 37 is arc-shaped, and a heating groove 371 is provided on the side wall of the heating plate 37 near the electric heating wire 38. The end face of the heating groove 371 is inverted U-shaped, and the electric heating wire 38 is located in the heating groove 371.

[0067] When the two electric arc blocks 36 are activated, the heating plates 37 slide along the opening direction of the arc track 35, so that the two heating plates 37 leave the cavity 341 and gradually unfold, so that one heating plate 37 covers the spot welding area and the other heating plate 37 covers the tail of the continuous welding, thereby achieving the purpose of heating and slow cooling of the corresponding area by the corresponding electric heating wire 38.

[0068] Example 3: A method for welding aluminum alloy pipes, using the aluminum alloy pipe welding apparatus described above, includes the following steps:

[0069] S1. Place the spot-welded aluminum alloy pipe on the support frame 11, so that the end spot-welded with the flange is close to the support frame 21. Then start the lifting cylinder 12, and its extension end pushes the lifting platform 13 to move upward, so that the lifting plate 14 and the pulley 15 move synchronously to lift the aluminum alloy pipe and make the aluminum alloy pipe at a height that is easy to weld.

[0070] S2. During the operation of S1, the pressing cylinder 16 is started at the same time. Its telescopic end pushes the pressing plate 17 to rotate along the side wall of the upright block 18, so that the pressing plate 17 is close to the aluminum alloy pipe, pressing the aluminum alloy pipe, and cooperating with the lifting plate 14 to fix and clamp the aluminum alloy pipe.

[0071] S3. When welding aluminum alloy pipes and flanges, on the one hand, the electric slider 27 is activated, driving the adjusting component 28 and the welding torch 29 to slide along the opening direction of the slide rail 26, so that the welding torch 29 is close to the welding point of the aluminum alloy pipe and flange and welds the point to be welded; on the other hand, the displacement cylinder 22 is also activated, its telescopic end extends, pushing the displacement slider 23 to slide, so that the electric telescopic rod 24 is also moved synchronously, and pulls the rotating disk 25 to rotate, so that the four welding torches 29 can continuously weld in the corresponding welding area, and stop welding when they approach the spot welding area, without contacting the four spot welding areas.

[0072] S4. During the operation of S3, the electric telescopic rod 24 is started. Its telescopic end will extend or retract as the rotating disk 25 rotates and the distance between the rotating disk 25 and the electric telescopic rod 24 itself increases. The adjusting component 28 can adjust the welding angle of the welding torch 29 so that the welding torch 29 always maintains the best welding tilt angle. At the same time, it can also rotate the angle of the welding torch 29 in the opposite direction to reduce the tailing of the welding wire at the end of the welding.

[0073] S5. After the initial welding is completed, the spot welding area is ground with an angle grinder to remove impurities from the surface of the spot welding area. At this time, there is a gap between the spot welding area and the tail of the continuous welding. Then the telescopic cylinder 33 is started, which drives the telescopic plate 34 to approach the spot welding area and the tail of the continuous welding to cover the two areas.

[0074] S6. During the operation of S5, the two electric arc blocks 36 are also activated, driving the heating plate 37 and the electric heating wire 38 to slide along the opening direction of the arc track 35, so that the two heating plates 37 leave the interior of the telescopic plate 34 and gradually unfold, so that one heating plate 37 covers the spot welding area and the other heating plate 37 covers the tail of the continuous welding, thereby achieving the purpose of heating and slowly cooling the corresponding area by the corresponding electric heating wire 38.

[0075] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. An aluminum alloy pipe welding device, characterized in that: include, The support unit (1) includes a support frame (11), a lifting cylinder (12) disposed in the support frame (11), a lifting platform (13) disposed at the extension end of the lifting cylinder (12), lifting plates (14) symmetrically disposed at both ends of the lifting platform (13) in the radial direction, pulleys (15) symmetrically disposed in the lifting plate (14) in the axial direction, a pressing cylinder (16) symmetrically disposed on one side of the support frame (11) in the radial direction, a pressing plate (17) rotatably connected to the extension end of the pressing cylinder (16), and a vertical block (18) rotatably connected to the side wall of the pressing plate (17); the end of the vertical block (18) away from the pressing plate (17) is connected to the top of the support frame (11); Welding unit (2), located at one end of the support frame (11), includes a support frame (21), a displacement cylinder (22) located on one side of the support frame (21), a displacement slider (23) located at the telescopic end of the displacement cylinder (22), an electric telescopic rod (24) located on the side wall of the displacement slider (23), a rotating disk (25) rotatably connected to the telescopic end of the electric telescopic rod (24), slide rails (26) evenly arranged on the side wall of the rotating disk (25) in all directions, an electric slider (27) sliding on the slide rail (26), an adjusting member (28) located on the side of the electric slider (27) away from the slide rail (26), and a welding torch (29) located at one end of the adjusting member (28); the adjusting member (28) can adjust the welding angle of the welding torch (29), and can also rotate the angle of the welding torch (29) in the opposite direction to reduce wire trailing; and, The slow cooling unit (3) is located on one side of the adjusting member (28). It includes a fixed plate (31), a fixed block (32) on the side wall of the fixed plate (31), a telescopic cylinder (33) at one end of the fixed block (32), a telescopic plate (34) at the telescopic end of the telescopic cylinder (33), an arc track (35) symmetrically arranged in the telescopic plate (34), an electric arc block (36) sliding on the arc track (35), a heating plate (37) on the side of the electric arc block (36) away from the arc track (35), and an electric heating wire (38) on the side wall of the heating plate (37). One heating plate (37) covers the spot welding area, and the other heating plate (37) covers the tail of the continuous welding.

2. The aluminum alloy pipe welding device according to claim 1, characterized in that: The top of the support frame (11) is also provided with a support plate (111), and the top of the support plate (111) is also symmetrically provided with through slots (112) in the radial direction. The end of the lifting plate (14) away from the lifting platform (13) can pass through the corresponding through slot (112).

3. The aluminum alloy pipe welding device according to claim 2, characterized in that: The lifting plate (14) is provided with a placement groove (141) at one end away from the lifting platform (13). The placement groove (141) is arc-shaped. The pulleys (15) are symmetrically distributed about the placement groove (141). The two ends of the pulleys (15) are rotatably connected to the inner wall of the lifting plate (14).

4. The aluminum alloy pipe welding device according to claim 3, characterized in that: The side wall of the pressing plate (17) is provided with a pressing groove (171), the pressing groove (171) is arc-shaped, and a rubber pad (172) is provided inside the pressing groove (171).

5. The aluminum alloy pipe welding device according to claim 1, characterized in that: The displacement slider (23) is provided with a long track (231) on the side away from the electric telescopic rod (24). The displacement slider (23) can slide on the long track (231). The side of the long track (231) away from the displacement slider (23) is connected to the side wall of the support frame (21). The support frame (21) is symmetrically provided with long plates (211) in the radial direction near the side wall of the displacement cylinder (22). The two ends of the long plates (211) are rotatably connected with fixed pulleys (212). The outer ring of the rotating disk (25) can be rolled and connected with the fixed pulleys (212). A through hole (251) is provided in the middle of the rotating disk (25).

6. The aluminum alloy pipe welding device according to claim 5, characterized in that: The adjusting component (28) includes an extension plate (281), an adjusting motor (282) disposed on one side of the extension plate (281), and an adjusting plate (283) disposed at the output end of the adjusting motor (282). One side of the extension plate (281) can be connected to the side wall of the electric slider (27) away from the slide rail (26). The adjustment motor (282) is located on the side of the extension plate (281) close to the electric slider (27). The output end of the adjustment motor (282) passes through the extension plate (281) and is connected to the adjustment plate (283). The welding torch (29) is located at one end of the adjustment plate (283).

7. The aluminum alloy pipe welding device according to claim 6, characterized in that: An arc-shaped plate (284) is provided at the end of the adjustment plate (283) away from the welding gun (29). An angle value (285) is provided on the arc-shaped plate (284). An arrow (286) is also provided on the side wall of the extension plate (281) near the adjustment plate (283). One end of the arrow (286) is located on the angle value (285).

8. The aluminum alloy pipe welding device according to claim 1, characterized in that: The side of the fixed plate (31) away from the fixed block (32) is connected to the side wall of the rotating disk (25) near the slide rail (26). The telescopic end of the telescopic cylinder (33) passes through the fixed block (32) and is connected to the telescopic plate (34). The telescopic plate (34) is arc-shaped and has a cavity (341) inside. The cavity (341) can pass through both ends of the telescopic plate (34).

9. The aluminum alloy pipe welding device according to claim 8, characterized in that: The arc-shaped track (35) is symmetrically distributed in the cavity (341). The heating plate (37) is arc-shaped. A heating groove (371) is provided on the side wall of the heating plate (37) near the electric heating wire (38). The end face of the heating groove (371) is inverted U-shaped. The electric heating wire (38) is located in the heating groove (371).

10. A method for welding aluminum alloy pipes, using the aluminum alloy pipe welding apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Place the spot-welded aluminum alloy pipe on the support frame (11) so that the end spot-welded with the flange is close to the support frame (21). Then start the lifting cylinder (12), and its extension end pushes the lifting platform (13) to move upward, so that the lifting plate (14) and pulley (15) move synchronously to lift the aluminum alloy pipe and make the aluminum alloy pipe at a height that is easy to weld. S2. During the operation of S1, the pressing cylinder (16) is started at the same time. Its telescopic end pushes the pressing plate (17) to rotate along the side wall of the upright block (18), so that the pressing plate (17) gets close to the aluminum alloy pipe, presses the aluminum alloy pipe, and cooperates with the lifting plate (14) to fix and clamp the aluminum alloy pipe. S3. When welding aluminum alloy pipes and flanges, on the one hand, the electric slider (27) is started, driving the adjusting part (28) and the welding gun (29) to slide along the opening direction of the slide rail (26), so that the welding gun (29) is close to the welding point of the aluminum alloy pipe and flange and welds the point to be welded; on the other hand, the displacement cylinder (22) is also started, its telescopic end extends, pushing the displacement slider (23) to slide, so that the electric telescopic rod (24) is also moved synchronously, and pulls the rotating disk (25) to rotate, so that the four welding guns (29) can continuously weld in the corresponding welding area, and stop welding when they are close to the spot welding area, without contacting the four spot welding areas; S4. During the operation of S3, the electric telescopic rod (24) is started. Its telescopic end will extend or retract as the rotating disk (25) rotates and as the distance between the rotating disk (25) and the electric telescopic rod (24) itself increases. The adjusting component (28) can adjust the welding angle of the welding torch (29) so that the welding torch (29) always maintains the best welding tilt angle. At the same time, it can also rotate the angle of the welding torch (29) in the opposite direction to reduce the tailing of the welding wire at the end of the welding. S5. After the initial welding is completed, the spot welding area is then ground with an angle grinder to remove impurities from the surface of the spot welding area. At this time, there is a gap between the spot welding area and the tail of the continuous welding. Then the telescopic cylinder (33) is started, which drives the telescopic plate (34) to approach the spot welding area and the tail of the continuous welding to cover the two areas. S6. During the operation of S5, the two electric arc blocks (36) are also activated, driving the heating plate (37) and the electric heating wire (38) to slide along the opening direction of the arc track (35), so that the two heating plates (37) leave the interior of the telescopic plate (34) and gradually unfold, so that one heating plate (37) covers the spot welding area and the other heating plate (37) covers the tail of the continuous welding, thereby achieving the purpose of heating and cooling the corresponding area by the corresponding electric heating wire (38).

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