A welding device for metal pipes

Abstract

The application discloses a welding device for metal pipeline, and relates to the technical field of metal pipeline processing. The welding device comprises a cooling mechanism, and a fixing mechanism is arranged on the top of the cooling mechanism. In use, the cooling device, the circulating pump and the cooling pipe can be used to cool and lower the temperature of the air in the cooling box, and then the air can be delivered to the metal pipeline to absorb the heat generated by welding, and the absorbed heat can be recycled through the first connecting pipe. The air absorbing heat can be cooled and lowered in temperature through the cooperation of the fan, the heat dissipation fins and the heat conducting pipe, so that the metal pipeline during welding can be efficiently cooled, the shrinkage deformation caused by the heat accumulation between the layers of the metal pipeline can be avoided, the subsequent welding quality can be greatly improved, the subsequent processing and use are facilitated, and the practical use effect of the metal pipeline welding device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal pipeline processing, in particular to a welding device for metal pipelines. BACKGROUND

[0002] Metal pipelines play a key role in modern industrial systems and infrastructure construction, and are widely used in many fields such as oil, natural gas, chemical industry, building water supply and drainage, and power transmission. In the oil and gas industry, long-distance oil and gas pipelines stretch thousands of kilometers, efficiently transporting oil and gas resources from the mining area to the processing and consumption area, which is the "artery" of energy supply. The quality of the connection of the metal pipeline is of great importance to the safety and stability of the system operation, and welding, as a common connection method, plays a decisive role. High-quality welded joints can ensure the sealing of the pipeline internal medium conveying, prevent environmental pollution and safety accidents caused by leakage, and withstand the pressure, temperature changes and external mechanical stress in the pipeline system operation, maintaining the structural integrity of the pipeline.

[0003] In the prior art, when the metal pipeline needs to be connected and fixed, a welding device is used to weld the metal pipeline, thereby realizing the connection and fixation between the pipelines. However, during the welding process of the metal pipeline, high temperature is generated during welding, and it is difficult to quickly discharge the heat, resulting in heat accumulation between the metal pipeline layers, causing shrinkage deformation. The shrinkage deformation of the metal pipeline during the welding process not only affects the subsequent welding quality, but also affects the further processing and use of the subsequent pipeline, so that the actual use effect of the metal pipeline welding device is poor. SUMMARY

[0004] The purpose of the present application is to provide a welding device for metal pipelines to solve the problem that the conventional welding device cannot discharge the heat generated during welding when welding the metal pipeline, causing the metal pipeline to deform during the welding process.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a welding device for metal pipelines, comprising a cooling mechanism, a fixing mechanism is arranged on the top of the cooling mechanism;

[0006] The cooling mechanism comprises a workbench, an installation frame is fixedly installed at the inner wall bottom of the workbench, a plurality of ventilation slots are formed in the outer wall of the installation frame, a heat conduction pipe is arranged on the inner wall of the installation frame, a first connecting pipe is fixedly connected to the outer wall of the heat conduction pipe, a heat dissipation fin is fixedly installed at the inner wall bottom of the installation frame, the inner wall of the heat dissipation fin is fixedly connected to the outer wall of the heat conduction pipe, two installation plates are fixedly installed between the inner walls of the installation frame, two fans are fixedly installed on the outer wall of each of the two installation plates, a cooling box is fixedly installed at the inner wall bottom of the workbench, the outer wall of one side of the cooling box is fixedly connected to the outer wall of the heat conduction pipe, an air inlet slot is formed in the outer wall of one side of the cooling box, and a plurality of guide plates are fixedly installed on the inner wall of the cooling box.

[0007] Preferably, a top plate is fixedly installed at the top of the cooling box, a cooling pipe is arranged on the inner wall bottom of the cooling box, a circulating pump is fixedly installed at the top of the top plate, and the outer wall of the circulating pump is fixedly connected to the outer wall of the cooling pipe.

[0008] Preferably, a cooling device is fixedly installed at the top of the top plate, the outer wall of the cooling device is fixedly connected to the outer wall of the cooling pipe, a second connecting pipe is fixedly connected to the outer wall of one side of the cooling box, a gas conveying pump is fixedly installed at the inner wall bottom of the workbench, the outer wall of the gas conveying pump is fixedly connected to the outer wall of the second connecting pipe, and a welding assembly is fixedly installed at the top of the workbench.

[0009] Preferably, the fixing mechanism comprises a bottom plate, two support plates are fixedly installed at the top of the bottom plate, a second motor is fixedly installed on the outer wall of one side of the bottom plate, two movable slots are formed in the top of the bottom plate, a bidirectional screw rod is movably inserted between the inner walls of the two movable slots, the outer wall of the bidirectional screw rod is fixedly connected to the output end of the second motor, two movable frames are movably embedded in the inner walls of the two movable slots, the inner wall of the movable frame is threadedly connected to the outer wall of the bidirectional screw rod, a third motor is fixedly installed on the outer wall of one side of one of the two movable frames, and a first gear is fixedly sleeved on the output end of the third motor.

[0010] Preferably, a fixing disc is arranged on the inner wall of each of the two movable frames, a second gear is fixedly sleeved on the outer wall of one of the two fixing discs, and a gas conveying pipe is fixedly inserted in the inner wall of each of the two fixing discs.

[0011] Preferably, a pipeline rotary connector is arranged on the inner wall of each of the two gas conveying pipes, three insertion slots are formed in the outer wall of each of the two fixing discs, a movable column is movably inserted in the inner wall of each of the three insertion slots, a fixing plate is fixedly installed on the outer wall of each of the three movable columns, and an anti-skid pad is fixedly installed on the outer wall of each of the three fixing plates.

[0012] Preferably, the inner wall of the two fixing discs is provided with three engaging wheels, and the outer wall of the engaging wheels is engaged with the outer wall of the movable column, and the inner wall of the two fixing discs is provided with a ring gear, and the inner wall of the ring gear is engaged with the outer wall of the engaging wheels.

[0013] Preferably, the outer wall of the two fixing discs is fixedly installed with a fourth motor, the output end of the fourth motor is fixedly sleeved with a transmission wheel, and the outer wall of the transmission wheel is engaged with the outer wall of the ring gear, and the inner wall of the two fixing discs is provided with two sealing rings.

[0014] Preferably, the top of the bottom plate is provided with a sliding groove, the inner wall of the sliding groove is movably embedded with a mounting table, the top of the mounting table is fixedly installed with a first motor, the output end of the first motor is fixedly sleeved with a grinding wheel, the inner wall of the bottom plate is fixedly inserted with a telescopic rod, and the telescopic end of the telescopic rod is fixedly connected with the outer wall of the mounting table.

[0015] Preferably, the top of the workbench is fixedly connected with the bottom of the bottom plate, and the inner wall of the two pipeline rotary connectors is fixedly connected with the outer wall of the first connecting pipe and the second connecting pipe.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1、In use, when the metal pipeline needs to be cooled during welding, first, under the action of the air inlet pump, the second connecting pipe and the air inlet groove, air is sucked into the cooling box, and under the action of the guide plate, the air slowly moves in the cooling box, at this time, under the action of the cooling device, the circulating pump and the cooling pipe, the air in the cooling box can be cooled and cooled, then it is transported to the metal pipeline to absorb the heat generated by welding, and through the first connecting pipe, it is recycled, and through the cooperation of the fan, the heat dissipation fin and the heat conduction pipe, the air absorbing heat can be cooled and cooled, and finally enters the cooling box for recycling, so that the metal pipeline during welding can be efficiently cooled, avoiding the shrinkage deformation caused by the heat accumulation between the metal pipeline layers, greatly improving the subsequent welding quality and facilitating the subsequent processing and use, thereby improving the actual use effect of the metal pipeline welding device.

[0018] 2、The application is used, when the metal pipeline needs to be welded, it needs to be fixed, first, the metal pipeline is carried to the appropriate position, and is inserted into the fixed disc, then under the cooperation of the fourth motor, the transmission wheel, the ring gear and other structures, the movable column and the fixed plate can be driven to move to the middle, so as to complete the fixation of the metal pipeline, and under the action of the non-slip pad, the metal pipeline can be fixed more tightly, then under the action of the second motor and the bidirectional screw rod, the movable frame moves in the sliding groove, and drives the metal pipeline to move to the appropriate position, so that the cross section of the metal pipeline is in contact, then under the cooperation of the third motor, the first gear and the welding assembly, the metal pipeline is welded, through the above structure and method, the metal pipeline can be effectively fixed, displacement of the metal pipeline during welding is avoided, and the welding effect is improved.

[0019] 3、The application is used, when the metal pipeline is fixed, under the action of the telescopic rod, the mounting table moves in the sliding groove, and drives the first motor and the grinding wheel to move to the appropriate position, the grinding wheel is in contact with the surface of the metal pipeline, then under the action of the first motor, the grinding wheel rotates, so that the metal pipeline can be polished, the rust and impurities on the surface of the metal pipeline do not affect the subsequent welding, and the welding quality of the metal pipeline is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the metal pipeline welding device of the application;

[0021] Figure 2 It is a perspective view of the cooling mechanism in the metal pipeline welding device of the application;

[0022] Figure 3 It is a sectional view of the cooling mechanism in the metal pipeline welding device of the application;

[0023] Figure 4 It is a sectional exploded view of the cooling mechanism in the metal pipeline welding device of the application;

[0024] Figure 5 It is a perspective view of the fixing mechanism in the metal pipeline welding device of the application;

[0025] Figure 6 It is an exploded view of the fixing mechanism in the metal pipeline welding device of the application;

[0026] Figure 7 It is a sectional view of the fixing mechanism in the metal pipeline welding device of the application;

[0027] Figure 8 It is a sectional exploded view of the fixing mechanism in the metal pipeline welding device of the application.

[0028] In the figure: 1, cooling mechanism; 11, workbench; 112, welding assembly; 12, mounting frame; 121, ventilation groove; 122, heat conduction pipe; 123, first connecting pipe; 124, heat dissipation fin; 125, mounting plate; 126, fan; 13, cooling box; 131, air inlet groove; 132, guide plate; 133, top plate; 134, cooling pipe; 135, circulating pump; 136, cooling device; 137, second connecting pipe; 138, air conveying pump; 2, fixing mechanism; 21, bottom plate; 211, sliding groove; 212, mounting table; 213, first motor; 214, polishing wheel; 215, telescopic rod; 22, support plate; 23, second motor; 24, movable groove; 241, bidirectional screw rod; 242, movable frame; 243, third motor; 244, first gear; 25, fixed disc; 251, second gear; 252, air conveying pipe; 253, pipe rotary connector; 26, insertion groove; 261, movable column; 262, fixed plate; 263, non-slip pad; 264, meshing wheel; 265, ring gear; 27, fourth motor; 271, transmission wheel; 28, sealing ring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Embodiment one, refer to Figures 1-8 As shown in the figure: the present application provides a welding device for metal pipeline, which comprises a cooling mechanism 1, and a fixing mechanism 2 is arranged on the top of the cooling mechanism 1;

[0031] The cooling mechanism 1 comprises a workbench 11, the inner wall bottom of the workbench 11 is fixedly provided with a mounting frame 12, a plurality of ventilation slots 121 are formed in the outer wall of the mounting frame 12, a heat conduction pipe 122 is arranged on the inner wall of the mounting frame 12, the outer wall of the heat conduction pipe 122 is fixedly communicated with a first connecting pipe 123, a heat dissipation fin 124 is fixedly arranged on the inner wall bottom of the mounting frame 12, the inner wall of the heat dissipation fin 124 is fixedly connected with the outer wall of the heat conduction pipe 122, two mounting plates 125 are fixedly arranged between the inner walls of the mounting frame 12, two fans 126 are fixedly arranged on the outer wall of each of the two mounting plates 125, a cooling box 13 is fixedly arranged on the inner wall bottom of the workbench 11, one side of the outer wall of the cooling box 13 is fixedly communicated with the outer wall of the heat conduction pipe 122, an air inlet slot 131 is formed on one side of the outer wall of the cooling box 13, a plurality of guide plates 132 are fixedly arranged on the inner wall of the cooling box 13, a top plate 133 is fixedly arranged on the top of the cooling box 13, a cooling pipe 134 is arranged on the inner wall bottom of the cooling box 13, a circulating pump 135 is fixedly arranged on the top of the top plate 133, the outer wall of the circulating pump 135 is fixedly communicated with the outer wall of the cooling pipe 134, a cooling device 136 is fixedly arranged on the top of the top plate 133, the outer wall of the cooling device 136 is fixedly communicated with the outer wall of the cooling pipe 134, a second connecting pipe 137 is fixedly communicated with one side of the outer wall of the cooling box 13, a gas conveying pump 138 is fixedly arranged on the inner wall bottom of the workbench 11, the outer wall of the gas conveying pump 138 is fixedly communicated with the outer wall of the second connecting pipe 137, and a welding assembly 112 is fixedly arranged on the top of the workbench 11.

[0032] In this embodiment, when the metal pipeline needs to be cooled during the welding process, first, under the action of the gas delivery pump 138 and the second connecting pipe 137, the external air enters the cooling box 13 from the air inlet groove 131, and under the action of the guide plate 132, the air can move slowly inside the cooling box 13, at the same time, under the action of the circulating pump 135, the cooling water in the cooling pipe 134 can circulate and absorb the heat of the air, after absorbing the heat, the cooling water is transported to the cooling device 136, through the fan and semiconductor heat dissipation device inside the cooling device 136, the cooling water can be cooled and cooled for a long time to cool the air inside the cooling box 13, then under the action of the gas delivery pump 138 and the second connecting pipe 137, the cooled air is transported to the metal pipeline during welding, through the continuous movement of the cold air, the heat generated by the metal pipeline during welding can be absorbed and recycled from the first connecting pipe 123, during the recycling process, the air that absorbs heat is transported to the heat conduction pipe 122, through the cooperation of the fan 126 and the ventilation groove 121, the air inside the mounting frame 12 can circulate faster, and under the cooperation of the heat dissipation fins 124, the air inside the heat conduction pipe 122 can be cooled and cooled, then the air enters the cooling box 13, so that it can be recycled, so that the metal pipeline during the welding process can be cooled and cooled, to avoid the shrinkage deformation caused by the heat accumulation between the metal pipeline layers, so as to facilitate the subsequent processing and use.

[0033] Embodiment two, according to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the fixing mechanism 2 comprises a bottom plate 21, the top of the bottom plate 21 is fixedly installed with two support plates 22, one side of the outer wall of the bottom plate 21 is fixedly installed with a second motor 23, the top of the bottom plate 21 is provided with two movable grooves 24, the inner surface wall between the two movable grooves 24 is movably inserted with a bidirectional screw rod 241 and the outer surface wall of the bidirectional screw rod 241 is fixedly connected with the output end of the second motor 23, the inner surface wall of the two movable grooves 24 is movably embedded with two movable racks 242 and the inner surface wall of the movable rack 242 is connected with the outer surface wall of the bidirectional screw rod 241 through threads, one side of the outer wall of one of the two movable racks 242 is fixedly installed with a third motor 243, the output end of the third motor 243 is fixedly sleeved with a first gear 244, the inner surface wall of the two movable racks 242 is provided with a fixed disc 25, the outer surface wall of one of the two fixed discs 25 is fixedly sleeved with a second gear 251, the inner surface wall of the two fixed discs 25 is fixedly inserted with a gas conveying pipe 252, the inner surface wall of the two gas conveying pipes 252 is provided with a pipeline rotary connector 253, the outer surface wall of the two fixed discs 25 is provided with three insertion grooves 26, the inner surface wall of the three insertion grooves 26 is movably inserted with a movable column 261, the outer surface wall of the three movable columns 261 is fixedly installed with a fixed plate 262, the outer surface wall of the three fixed plates 262 is fixedly installed with an anti-skid pad 263, the inner surface wall of the two fixed discs 25 is provided with three meshing wheels 264 and the outer surface wall of the meshing wheel 264 is meshed with the outer surface wall of the movable column 261, the inner surface wall of the two fixed discs 25 is provided with an annular gear 265 and the inner surface wall of the annular gear 265 is meshed with the outer surface wall of the meshing wheel 264, the outer surface wall of the two fixed discs 25 is fixedly installed with a fourth motor 27, the output end of the fourth motor 27 is fixedly sleeved with a transmission wheel 271 and the outer surface wall of the transmission wheel 271 is meshed with the outer surface wall of the annular gear 265, the inner surface wall of the two fixed discs 25 is provided with two sealing rings 28.

[0034] In this embodiment, when the metal pipe needs to be welded, the metal pipe needs to be fixed first. Under the operation of the worker, the metal pipe is inserted into the fixed disc 25, and under the action of the sealing ring 28, the sealing property of the metal pipe port can be improved. Then, under the action of the fourth motor 27, the transmission wheel 271 is driven to rotate. At the same time, under the action of the ring gear 265, the meshing wheel 264 is driven to rotate. The rotation of the meshing wheel 264 can drive the movable column 261 to move in the insertion slot 26 and drive the fixed plate 262 to move to the middle, thereby extruding and fixing the metal pipe in the fixed disc 25. At the same time, under the action of the non-slip pad 263, the metal pipe can be fully fixed to avoid displacement in the subsequent processing process and improve the processing effect. After the metal pipe is fixed, under the action of the second motor 23, the bidirectional screw rod 241 is driven to rotate, the movable frame 242 moves to the middle in the movable slot 24, and the metal pipe moves to the appropriate position, so that the cross sections of the metal pipes are in contact. Then, after the metal pipe is pretreated, the metal pipe is welded by the welding assembly 112. During the welding process, under the action of the third motor 243, the first gear 244 is driven to rotate, and under the action of the second gear 251, the fixed disc 25 is driven to rotate, thereby driving the metal pipe to rotate, so that the welding of the metal pipe is more convenient and the welding efficiency is improved.

[0035] In embodiment three, according to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , a chute 211 is formed in the top of the bottom plate 21. The inner surface wall of the chute 211 movably embeds a mounting table 212. The top of the mounting table 212 fixedly installs a first motor 213. The output end of the first motor 213 fixedly sleeves a grinding wheel 214. The inner surface wall of the bottom plate 21 fixedly inserts an extension rod 215. The extension end of the extension rod 215 is fixedly connected with the outer wall of one side of the mounting table 212. The top of the workbench 11 is fixedly connected with the bottom of the bottom plate 21. The inner surface walls of the two pipe rotary connectors 253 are fixedly connected with the outer surface walls of the first connecting pipe 123 and the second connecting pipe 137.

[0036] In this embodiment, when the metal pipeline is fixed, the installation table 212 is pushed to move to one end inside the sliding groove 211 under the action of the telescopic rod 215, and the first motor 213 and the polishing wheel 214 are driven to move to the appropriate position, so that the surface of the polishing wheel 214 is in contact with the surface of the metal pipeline. Then the first motor 213 drives the polishing wheel 214 to rotate, thereby polishing the welding part of the metal pipeline. At the same time, under the action of the third motor 243, the first gear 244, the second gear 251 and other structures, the fixed disc 25 and the metal pipeline are driven to rotate, thereby the welding part of the metal pipeline can be fully polished, greatly improving the welding quality of the metal pipeline and avoiding damage of the metal pipeline in the subsequent use process.

[0037] The working principle of the whole mechanism is as follows: when the welding device is needed to weld the metal pipe, the metal pipe needs to be fixed first. Under the operation of the worker, the metal pipe is inserted into the fixed disc 25, and under the action of the sealing ring 28, the sealing property of the metal pipe port can be improved. Then, under the action of the fourth motor 27, the transmission wheel 271 is driven to rotate, and under the action of the ring gear 265, the meshing wheel 264 is driven to rotate. The rotation of the meshing wheel 264 can drive the movable column 261 to move in the insertion slot 26 and drive the fixed plate 262 to move to the middle, so as to extrude and fix the metal pipe in the fixed disc 25. Under the action of the anti-skid pad 263, the metal pipe can be fixed sufficiently to avoid displacement in the subsequent processing process and improve the processing effect. After the metal pipe is fixed, under the action of the second motor 23, the bidirectional screw rod 241 is driven to rotate, the movable frame 242 moves to the middle in the movable slot 24, and the metal pipe moves to the appropriate position, so that the cross sections of the metal pipes are in contact. Then, under the action of the telescopic rod 215, the mounting table 212 moves to one end in the sliding groove 211, and the first motor 213 and the grinding wheel 214 move to the appropriate position, so that the surface of the grinding wheel 214 is in contact with the surface of the metal pipe. Then, the first motor 213 drives the grinding wheel 214 to rotate, so as to grind the welding part of the metal pipe. Under the action of the third motor 243, the first gear 244 is driven to rotate, and under the action of the second gear 251, the fixed disc 25 and the metal pipe are driven to rotate. Due to the friction force generated by the extrusion of the cross sections of the two metal pipes, the two metal pipes can rotate synchronously, so that the metal pipe welding process can be ground sufficiently. After the grinding process is completed, the metal pipe can be welded by the cooperation of the welding assembly 112, the third motor 243, the first gear 244, the second gear 251 and the fixed disc 25. During the welding process, when the metal pipe needs to be cooled, under the action of the air pump 138 and the second connecting pipe 137, the external air enters the cooling box 13 through the air inlet groove 131, and under the action of the guide plate 132, the air moves slowly in the cooling box 13. At the same time, under the action of the circulating pump 135, the cooling water in the cooling pipe 134 circulates and absorbs the heat of the air. After absorbing the heat, the cooling water is transported to the cooling device 136, which can cool the water by the fan and the semiconductor heat dissipation device. The cooled water can continuously cool the air in the cooling box 13 for a long time. Then, under the action of the air pump 138 and the second connecting pipe 137, the cooled air is transported into the metal pipe during welding. Through the continuous movement of the cold air, the heat generated by the metal pipe during welding can be absorbed and recycled through the first connecting pipe 123.In the recycling process, the air absorbing heat is delivered to the inside of the heat pipe 122, through the cooperation of the fan 126 and the ventilation slot 121, the air inside the mounting frame 12 can circulate faster, and through the cooperation of the heat dissipation fins 124, the air inside the heat pipe 122 can be cooled and cooled, and then the air enters the inside of the cooling box 13, which can be recycled, so as to realize the cooling treatment of the metal pipe, avoid the shrinkage deformation caused by the heat accumulation between the metal pipe layers.

[0038] The pipe rotating connector 253 is a connecting device that can realize the continuous transmission of fluid or gas in the rotating motion of the pipe system, and is widely used in mechanical, energy, chemical, aerospace and other fields. The pipe rotating connector 253 allows the pipe or equipment to maintain continuous transmission of fluid or gas while rotating through internal precise mechanical structures such as bearings, seals, etc. The core is the sealing design (mechanical seal, packing seal, magnetic fluid seal), which ensures that the medium does not leak during dynamic rotation, while bearing the system pressure, temperature and speed requirements

[0039] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements for part of the technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A welding apparatus for metal pipes, characterized by: Including cooling mechanism (1), the top of cooling mechanism (1) is provided with fixing mechanism (2); The cooling mechanism (1) includes a workbench (11), the inner wall bottom of the workbench (11) is fixedly installed with a mounting rack (12), a plurality of ventilation grooves (121) are formed in the outer wall of the mounting rack (12), a heat conduction pipe (122) is arranged on the inner wall of the mounting rack (12), the outer wall of the heat conduction pipe (122) is fixedly connected with a first connecting pipe (123), a heat dissipation fin (124) is fixedly installed on the inner wall bottom of the mounting rack (12), and the inner wall of the heat dissipation fin (124) is fixedly connected with the outer wall of the heat conduction pipe (122), two mounting plates (125) are fixedly installed between the inner walls of the mounting rack (12), two fans (126) are fixedly installed on the outer wall of one side of the two mounting plates (125), a cooling box (13) is fixedly installed on the inner wall bottom of the workbench (11), and one side of the outer wall of the cooling box (13) is fixedly connected with the outer wall of the heat conduction pipe (122), an air inlet groove (131) is formed in one side of the outer wall of the cooling box (13), and a plurality of guide plates (132) are fixedly installed on the inner wall of the cooling box (13); A top plate (133) is fixedly installed on the top of the cooling box (13), a cooling pipe (134) is arranged on the inner wall bottom of the cooling box (13), and a circulating pump (135) is fixedly installed on the top of the top plate (133), and the outer wall of the circulating pump (135) is fixedly connected with the outer wall of the cooling pipe (134); A cooling device (136) is fixedly installed on the top of the top plate (133), and the outer wall of the cooling device (136) is fixedly connected with the outer wall of the cooling pipe (134), a second connecting pipe (137) is fixedly connected with one side of the outer wall of the cooling box (13), a gas conveying pump (138) is fixedly installed on the inner wall bottom of the workbench (11), and the outer wall of the gas conveying pump (138) is fixedly connected with the outer wall of the second connecting pipe (137), and a welding assembly (112) is fixedly installed on the top of the workbench (11); The fixing mechanism (2) includes a bottom plate (21), two support plates (22) are fixedly installed on the top of the bottom plate (21), a second motor (23) is fixedly installed on one side of the outer wall of the bottom plate (21), two movable grooves (24) are formed in the top of the bottom plate (21), a bidirectional screw rod (241) is movably arranged between the inner walls of the two movable grooves (24), the outer wall of the bidirectional screw rod (241) is fixedly connected with the output end of the second motor (23), two movable racks (242) are movably arranged in the inner walls of the two movable grooves (24), the inner wall of the movable rack (242) is threadedly connected with the outer wall of the bidirectional screw rod (241), a third motor (243) is fixedly installed on one side of the outer wall of one of the two movable racks (242), and a first gear (244) is fixedly sleeved on the output end of the third motor (243). The inner walls of the two movable racks (242) are provided with fixed discs (25), the outer wall of one of the two fixed discs (25) is fixedly sleeved with a second gear (251), and the inner walls of the two fixed discs (25) are fixedly inserted with gas conveying pipes (252); The inner walls of the two gas conveying pipes (252) are provided with pipeline rotary connectors (253), the outer walls of the two fixed discs (25) are provided with three insertion grooves (26), the inner walls of the three insertion grooves (26) are movably inserted with movable columns (261), the outer walls of the three movable columns (261) are fixedly installed with fixed plates (262), and the outer walls of the three fixed plates (262) are fixedly installed with anti-skid pads (263).

2. A welding apparatus for metal pipes according to claim 1, characterized in that: The inner walls of the two fixed discs (25) are provided with three meshing wheels (264), the outer wall of the meshing wheel (264) is meshed with the outer wall of the movable column (261), the inner walls of the two fixed discs (25) are provided with ring gears (265), and the inner wall of the ring gear (265) is meshed with the outer wall of the meshing wheel (264).

3. A welding apparatus for metal pipes as defined in claim 2, characterized in that: The outer walls of the two fixed discs (25) are fixedly installed with fourth motors (27), the output ends of the fourth motors (27) are fixedly sleeved with transmission wheels (271), the outer wall of the transmission wheel (271) is meshed with the outer wall of the ring gear (265), and the inner walls of the two fixed discs (25) are provided with two sealing rings (28).

4. A welding apparatus for metal pipes as defined in claim 3, characterized in that: The top of the bottom plate (21) is provided with a sliding groove (211), the inner wall of the sliding groove (211) is movably embedded with a mounting table (212), the top of the mounting table (212) is fixedly installed with a first motor (213), the output end of the first motor (213) is fixedly sleeved with a grinding wheel (214), the inner wall of the bottom plate (21) is fixedly inserted with an expansion rod (215), and the expansion end of the expansion rod (215) is fixedly connected with the outer wall of one side of the mounting table (212).

5. A welding apparatus for metal pipes as defined in claim 4, wherein: The top of the workbench (11) is fixedly connected with the bottom of the bottom plate (21), and the inner walls of the two pipeline rotary connectors (253) are fixedly connected with the outer walls of the first connecting pipe (123) and the second connecting pipe (137).

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