A large-scale pipe column welding apparatus

Abstract

The present application provides a large pipe column welding device, the pipe column is a cylindrical pipe with a circular cross section, characterized in that the welding device comprises a clamping device for supporting and limiting the pipe column, and a welding device for welding the pipe column; the clamping device comprises a chuck for clamping the pipe column, a rotating drive mechanism for driving the chuck to rotate, and at least one support mechanism for supporting the pipe column along the length direction of the pipe column; the welding device comprises a welding torch and a welding torch drive mechanism, the welding torch drive mechanism drives the welding torch to move along the length direction and the height direction of the pipe column to weld the inner surface and the outer surface of the pipe column. The chuck of the present application clamps one end of the pipe column, the support mechanism supports the pipe column, the rotating drive mechanism drives the chuck to rotate, the pipe column slowly rotates with the chuck, and as the pipe column rotates, the welding torch feeds along the length direction of the pipe column to weld on the outer surface / inner surface of the pipe column to form a welding layer.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically relating to a large-scale pipe column welding equipment. Background Technology

[0002] To improve the wear and corrosion resistance of underwater equipment, especially in the sea, and to reduce costs, a protective layer is typically welded onto the surface of parts. For example, when using metal tubing in underwater equipment, a layer of solder is welded to both the outer and inner surfaces of the tubing. This protective layer, formed by welding with S216 aluminum-nickel bronze welding wire, covers the inner and outer surfaces of the copper tubing 360° in a circumferential direction, protecting the metal tubing and extending its lifespan.

[0003] Existing tubular welding equipment typically fixes the tubular column and then welds specific areas on its outer wall using a welding torch. This method cannot weld a layer of material onto the entire outer and inner surfaces of the tubular column. For example, CN202310513625.7 discloses a large tubular column welding and forming system. This system uses outer and inner clamping blocks to hold and fix the tubular column. The welding shaft can be deflected on a mounting plate via a rotating axis, adjusting its tilt angle. A ball-head block can deflect inside the receiving shaft, allowing for full-angle adjustment of its position, which in turn adjusts the angle of the welding head, enabling welding of the clamped tubular column. However, because the tubular column is fixed by the outer and inner clamping blocks, areas obscured by these blocks cannot be welded, thus preventing the application of a layer of solder to the entire outer and inner surfaces of the tubular column. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art, and the purpose of the present invention is to provide a large-scale pipe column welding equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a large-scale pipe column welding equipment, wherein the pipe column is a cylindrical tube with a circular cross-section, the welding equipment includes a clamping device for supporting and limiting the pipe column, and a welding device for welding the pipe column; the clamping device includes a chuck for clamping the pipe column, a rotary drive mechanism for driving the chuck to rotate, and at least one support mechanism for supporting the pipe column spaced apart along the length direction of the pipe column; the welding device includes a welding torch and a welding torch drive mechanism, the welding torch drive mechanism driving the welding torch to move along the length and height directions of the pipe column to weld the inner and outer surfaces of the pipe column.

[0006] In the above technical solution, the chuck clamps one end of the tubing, the support mechanism supports the tubing, and the rotary drive mechanism drives the chuck to rotate. The tubing rotates slowly with the chuck, and the welding torch starts welding from the outer / inner surface of one end of the tubing. As the tubing rotates, the welding torch welds a weld seam of a certain width on the outer / inner surface of the tubing. After one round of welding is completed, the welding torch drive mechanism drives the welding torch to move for feeding. The feeding distance is the width of the weld seam. In this way, weld seams are welded one after another on the outer surface of the tubing, and the weld seams are connected to form a weld layer on the outer surface of the tubing.

[0007] In a preferred embodiment of the present invention, the support mechanism includes two rotatable support wheels spaced apart along the width of the tube column. The axis of the support wheels is parallel to the axis of the tube column. When the chuck clamps and fixes the tube column, the tube column is located between the two support wheels and the outer surface of the tube column is tangent to the outer surfaces of the two support wheels.

[0008] In the above technical solution, when the tubing rotates with the chuck, the support wheels support the tubing on both sides, and at the same time, the support wheels rotate to reduce rotational friction resistance.

[0009] In a preferred embodiment of the present invention, the support mechanism further includes a position sensing device for detecting the arrival of the weld seam on the support wheel, and a lifting drive for driving the two support wheels to rise and fall separately. The signal output terminal of the position sensing device is connected to the position input terminal of the controller, and the descent control terminal of the controller is connected to the descent start terminal of the lifting drive.

[0010] The above technical solution, after welding the solder to the outer surface of the tube column, increases the outer diameter of the tube column. When welding to the support wheel position, the lifting drive drives the support wheel to descend to adapt to the increase in the outer diameter of the tube column and maintain the coaxiality of the tube column. This eliminates the need to turn the tube column around for clamping, shortening the welding time. This is especially important for large tube columns, where each clamping takes a lot of time and manpower. In addition, when the diameter of the tube column changes, the two support wheels can be raised and lowered to adapt to the change in tube column diameter, making the welding equipment applicable to welding tube columns of different diameters.

[0011] In a preferred embodiment of the present invention, the positioning sensing device is an image sensor installed on the outside of the pipe column. The image sensor is located upstream of the support wheel. The controller controls the lifting drive to work based on the weld positioning information detected by the image sensor and the rotation speed of the pipe column, so that the two support wheels in the same circumferential position lower the height one after the other.

[0012] In the above technical solution, when the image sensor detects that the weld is in place, the weld has not yet rotated with the pipe column to the support wheel. The support wheel to whichever support wheel the weld rotates to will lower its height. The two support wheels will not lower their heights at the same time, which makes the coaxiality adjustment effect better.

[0013] In a preferred embodiment of the present invention, the support mechanism further includes a weld thickness detection device for detecting the weld thickness reaching the support wheel. The signal output terminal of the weld thickness detection device is connected to the weld thickness input terminal of the controller, and the descent stop control terminal of the controller is connected to the descent stop terminal of the lifting drive.

[0014] In the above technical solution, the controller controls the lifting drive to work based on the weld thickness detected by the weld thickness detection device, so as to adaptively adjust the descent height of the support wheel. Moreover, as the weld gradually thickens, the support wheel gradually lowers. Thus, the descent height of the support wheel can be adjusted in real time according to different weld thicknesses, further improving the coaxiality adjustment effect.

[0015] In another preferred embodiment of the present invention, the support wheel is rotatably mounted on the mounting frame via a pivot, the mounting frame is connected to the horizontally arranged support plate by pulleys along the width direction of the column, the mounting frame is detachably fixed to the support plate by locking members, and the lifting drive member is connected to the support plate and drives the support plate to move vertically.

[0016] The above technical solution allows for adjustment of the distance between the two support wheels by sliding the mounting bracket laterally on the support plate. This adjustment can also accommodate changes in the diameter of the tubular column.

[0017] In another preferred embodiment of the present invention, the welding torch driving mechanism includes a first bracket, a column mounted on the first bracket, a second bracket slidably connected to the column, a crossbeam mounted on the second bracket, a first driving member that drives the first bracket to move along the length of the column so that the crossbeam moves accordingly, and a second driving member that drives the second bracket to move vertically on the column so that the crossbeam rises and falls, with the welding torch mounted at the end of the crossbeam.

[0018] In the above technical solution, the first driving member drives the first bracket to move linearly so that the welding torch moves along the length of the pipe column, and the second driving member drives the second bracket to move vertically so that the welding torch moves along the height of the pipe column.

[0019] In another preferred embodiment of the present invention, the welding torch driving mechanism further includes a third bracket slidably connected to the first bracket, and a third driving member for driving the third bracket to move along the width direction of the column, wherein the lower end of the column is fixed on the third bracket.

[0020] The above technical solution, by setting a third bracket and a third driving component, allows the welding torch to move back and forth, which is beneficial for adjusting the position of the welding torch on the inner and outer surfaces of the pipe column.

[0021] In another preferred embodiment of the present invention, the crossbeam is a telescopic rod structure that can extend and retract along the length direction of the column. The crossbeam includes a first beam body fixedly connected to the second bracket, a second beam body slidably connected to the first beam body, and a fourth driving member that drives the second beam body to slide along the length direction of the first beam body. The welding torch is installed at the end of the second beam body.

[0022] In the above technical solution, the crossbeam is a telescopic rod structure that can extend and retract along the length of the pipe column, thereby changing the width of each weld by moving the welding torch back and forth.

[0023] In another preferred embodiment of the invention, the welding equipment further includes a cooling device that moves with the welding torch to cool the welding area of ​​the welding torch; and / or the welding equipment further includes a fume collector that moves with the welding torch to collect fumes from the welding area of ​​the welding torch.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a structural schematic diagram of a large-scale pipe column welding equipment according to an embodiment of this application.

[0027] Figure 2 This is a side view of the support structure according to an embodiment of this application.

[0028] The reference numerals in the accompanying drawings include: base 10, guide rail 11, clamping device 20, mounting plate 21, chuck 22, rotary drive mechanism 23, support mechanism 24, support wheel 241, mounting frame 242, lifting drive component 243, support plate 244, base plate 245, upright 246, position sensing device 247, weld thickness detection device 248, welding device 30, first bracket 31, second bracket 32, third bracket 33, column 34, crossbeam 35, first beam 351, second beam 352, welding torch 36, pipe column 40, weld 41, cooling device 50, and fume collector 60. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] This invention provides a welding device for a large tubular column 40, wherein the tubular column 40 is a cylindrical tube (including stepped cylindrical tubes) with a circular cross-section. For example... Figure 1 As shown, in one embodiment, the welding equipment includes a clamping device 20 for supporting and limiting the pipe column 40, and a welding device 30 for welding the pipe column 40. Preferably, a base 10 is fixedly connected to the surface, and both the clamping device 20 and the welding device 30 are mounted on the base 10. The clamping device 20 is located on the left side of the welding device 30.

[0033] The clamping device 20 includes a chuck 22 for clamping the tubing 40, a rotary drive mechanism 23 for driving the chuck 22 to rotate, and at least one support mechanism 24 spaced apart along the length of the tubing 40 to support the tubing 40, preferably two support mechanisms 24. A vertically mounted mounting plate 21 is fixed to the base 10. The rotary drive mechanism 23 and the chuck 22 are mounted on the mounting plate 21. The chuck 22 is a four-jaw chuck commonly used in machining. The rotary drive mechanism 23 for driving the chuck 22 also uses existing technology and will not be described in detail here. The welding device 30 includes a welding torch 36 and a welding torch 36 drive mechanism. The welding torch 36 drive mechanism drives the welding torch 36 to move along the length and height of the tubing 40 to weld the inner and outer surfaces of the tubing 40.

[0034] With this technical solution, the chuck 22 clamps the inner surface of the left end of the tube column 40, and the two support mechanisms 24 support the middle and right sides of the tube column 40 respectively; the welding torch 36 drive mechanism drives the welding torch 36 to move to the left, the welding torch 36 approaches the right end of the tube column 40, and the welding torch 36 drive mechanism drives the welding torch 36 to rise and fall, so that the welding torch 36 stops moving after being located at the initial welding position on the outer surface of the right end of the tube column 40. The rotary drive mechanism 23 drives the chuck 22 to rotate, and the tube column 40 rotates slowly with the chuck 22. The welding torch 36 starts welding from the outer surface of the rightmost end of the tube column 40. As the tube column 40 rotates, the welding torch 36 welds a ring of weld seam 41 with a certain width on the outer surface of the tube column 40. After one ring is welded, the welding torch 36 drive mechanism drives the welding torch 36 to move to the left to feed, and the feed distance is the width of the weld seam 41. Then it stops. As the tube column 40 rotates, the welding torch 36 welds another ring of weld seam 41 on the outer surface of the tube column 40. The two rings of weld seam 41 are connected. In this way, rings of weld seam 41 are welded on the outer surface of the tube column 40, and the rings of weld seam 41 are connected to form a weld layer on the outer surface of the tube column 40.

[0035] When welding the inner surface of the tubing 40, the chuck 22 clamps the outer surface of the left end of the tubing 40, and the welding torch 36 extends into the tubing 40 to perform welding. The specific welding process is the same as that for welding the outer surface of the tubing 40, and will not be described in detail here.

[0036] It should be noted that when the tubing 40 is a stepped cylindrical tube, the inner and outer diameters of the tubing 40 are different, so the height of the welding torch 36 needs to be adjusted accordingly during welding.

[0037] It should be noted that, since the outer diameter of the outer surface of the pipe column 40 will increase after welding, in order to ensure the coaxiality of the pipe column 40 and the welding quality, when welding the outer surface of the pipe column 40 for the first time, the outer surface of the pipe column 40 at the support mechanism 24 can be left unwelded. The pipe column 40 can be turned around and clamped again or the support mechanism 24 can be moved so that the support mechanism 24 supports the welded part of the pipe column 40. Then the unwelded part of the outer surface of the pipe column 40 can be welded.

[0038] like Figure 1 and Figure 2 As shown, in this invention, the support mechanism 24 includes two rotatable support wheels 241 spaced apart along the width direction of the tube column 40. The axes of the support wheels 241 are parallel to the axis of the tube column 40. When the chuck 22 clamps and fixes the tube column 40, the tube column 40 is located between the two support wheels 241, and the outer surface of the tube column 40 is tangent to the outer surfaces of the two support wheels 241. Thus, when the tube column 40 rotates with the chuck 22, the support wheels 241 support the tube column 40, and at the same time, the support wheels 241 rotate to reduce rotational friction resistance.

[0039] like Figure 2As shown, in another preferred embodiment, the support mechanism 24 further includes a position sensing device 247 for detecting the arrival of the weld seam 41 of the welding torch 36 at the support wheel 241, and a lifting drive 243 for driving the two support wheels 241 to rise and fall individually. The signal output terminal of the position sensing device 247 is connected to the position input terminal of the controller, and the descent control terminal of the controller is connected to the descent start terminal of the lifting drive 243. The lifting drive 243 can be an electric push rod or a hydraulic cylinder. The position sensing device 247 and the two support wheels 241 are located in the same vertical plane, for example, during welding, the column 40... Figure 2 As shown, when rotated clockwise, the positioning sensor 247 is positioned clockwise above the support wheel 241 on the right. The positioning sensor 247 can be an image sensor installed on the outside of the column 40. The image sensor can be installed on the upright 246. The controller controls the lifting drive 243 to work based on the positioning information of the weld 41 detected by the image sensor and the rotation speed of the column 40, so that the two support wheels 241 in the same circumferential position lower the height successively.

[0040] To ensure the support wheel 241 lowers in one continuous motion and prevent vibration during descent, a variable speed adjustment is used. The specific adjustment method is as follows:

[0041] When weld 41 reaches the edge of support wheel 241, support wheel 241 begins to lower, specifically by reducing acceleration: Where S is the thickness of the weld. The rotational speed of the tubing 40, The length of the support surface of the support wheel 241.

[0042] Support wheel 241 To reduce time for acceleration Then, with To reduce time for acceleration Weld 41 reaches the center of support wheel 241, and support wheel 241 is lowered into position.

[0043] As the welding torch 36 feeds to the left, the weld seam 41 welded by the welding torch 36 reaches the circle where the support wheel 241 contacts the pipe column 40. The welding torch 36 performs welding in this circle. The weld seam 41 rotates clockwise with the pipe column 40. The position sensing device 247 detects that the beginning of the weld seam 41 has arrived. The controller obtains the arrival signal from the position sensing device 247. When the beginning of the weld seam 41 reaches the right support wheel 241 (the specific location can be determined based on the rotation speed of the pipe column 40 and the arc length traversed by the beginning of the weld seam 41 to reach the right support wheel 241), the controller controls the corresponding lifting drive 243 to work so that the right support wheel 241 descends. As the pipe column 40 continues to select, the beginning of the weld seam 41 reaches the left support wheel 241. The controller controls the corresponding lifting drive 243 to work so that the left support wheel 241 descends, thereby adapting to the increase in the outer diameter of the pipe column 40 and ensuring the coaxiality of the pipe column 40.

[0044] like Figure 2 As shown, in another preferred embodiment, the support mechanism 24 further includes a weld thickness detection device 248 for detecting the thickness of the weld 41 reaching the support wheel 241. The signal output terminal of the weld thickness detection device 248 is connected to the weld 41 thickness input terminal of the controller, and the descent stop control terminal of the controller is connected to the descent stop terminal of the lifting drive 243. The weld thickness detection device 248 can be a distance sensor located on the outside of the column 40, where the decrease in distance detected by the distance sensor equals the increase in weld 41 thickness. Alternatively, the distance sensor can be mounted on the upright 246, below the image sensor, with the distance sensor at the same height as the centerline of the column 40, resulting in more accurate thickness measurement.

[0045] When the weld 41 reaches the point where the support wheel 241 contacts the pipe column 40, the distance sensor works or the controller acquires the distance data from the distance sensor. Based on the weld thickness detected by the weld thickness detection device 248, the controller drives the lifting drive component 243 to work, so as to adaptively adjust the descent height of the support wheel 241. If the weld 41 is thick and the pipe column 40 needs to rotate several times to complete the process, the support wheel 241 gradually decreases as the weld 41 gradually thickens.

[0046] like Figure 2As shown, in another preferred embodiment, the support wheel 241 is rotatably mounted on the mounting bracket 242 via a pivot. The mounting bracket 242 is connected to the horizontally arranged support plate 244 via pulleys along the width direction of the column 40. The mounting bracket 242 is detachably fixed to the support plate 244 by locking elements (such as bolts). By sliding the mounting bracket 242 laterally on the support plate 244 and locking it with bolts, the distance between the two support wheels 241 can be adjusted. The lifting drive 243 is connected to the support plate 244 and drives the support plate 244 to move vertically. Preferably, the two lifting drive 243 are mounted on the same base plate 245, and the lower end of the upright 246 is fixed to the base plate 245. The base plate 246 of the support mechanism 24 is bolted to the base 10, thereby facilitating the overall movement of the support mechanism 24.

[0047] The welding equipment of the present invention is applicable to pipe columns 40 of different diameters. Specifically, when the diameter of the pipe column 40 changes only slightly, the diameter can be adjusted by raising or lowering the two support wheels 241 or by adjusting the distance between the two support wheels 241. When the diameter of the pipe column 40 changes significantly, it is preferable to adjust the distance between the two support wheels 241 to adapt to the change in diameter, resulting in better support. It should be noted that both the image sensor and the distance sensor can slide on the upright 246 to adapt to changes in the diameter of the pipe column 40.

[0048] like Figure 1 As shown, in this invention, the welding torch 36 driving mechanism includes a first bracket 31, a column 34 mounted on the first bracket 31, a second bracket 32 ​​vertically slidably connected to the column 34, a crossbeam 35 mounted on the second bracket 32, a first driving member that drives the first bracket 31 to move along the length of the column 40 so that the crossbeam 35 moves accordingly, and a second driving member that drives the second bracket 32 ​​to move vertically on the column 34 so that the crossbeam 35 rises and falls. The welding torch 36 is mounted at the end of the crossbeam 35. A guide rail 11 extending along the length of the column 40 is fixedly connected to the base 10. The first bracket 31 is slidably connected to the guide rail 11. The first driving member can be a linear motor or a rotary motor + lead screw structure, as long as it can drive the first bracket 31 to move linearly on the guide rail 11. The second driving member can also be a linear motor or a rotary motor + lead screw structure, as long as it can drive the second bracket 32 ​​to move linearly on the column 34.

[0049] like Figure 1As shown, in another preferred embodiment, the welding torch 36 driving mechanism further includes a third bracket 33 slidably connected to the first bracket 31, and a third driving member that drives the third bracket 33 to move along the width direction (front-back direction) of the column 40. The lower end of the column 34 is fixed on the third bracket 33. The third driving member can also adopt the structure of a linear motor or a rotary motor + lead screw in the prior art, as long as it can drive the third bracket 33 to move linearly on the first bracket 31.

[0050] The third drive unit drives the third bracket 33 to move back and forth on the first bracket 31. The welding torch 36 moves back and forth with the third bracket 33 through the crossbeam 35, the second bracket 32 ​​and the column 34, which is conducive to adjusting the position of the welding torch 36 on the inner and outer surfaces of the tube column 40. Thus, the back and forth position of the welding torch 36 can be adjusted according to the actual situation. In addition, with the lifting and lowering and left and right movement of the welding torch 36, the position of the welding torch 36 in three-dimensional space can be adjusted.

[0051] like Figure 1 As shown, in another preferred embodiment, the crossbeam 35 is a telescopic rod structure that can extend and retract along the length of the column 40. For example, the crossbeam 35 includes a first beam 351 fixedly connected to the second bracket 32, a second beam 352 slidably connected to the first beam 351, and a fourth driving member that drives the second beam 352 to slide along the length of the first beam 351. The welding torch 36 is installed at the end of the second beam 352. The fourth driving member can also adopt a linear motor or a rotary motor + lead screw structure in the prior art, as long as it can drive the second beam 352 to move linearly on the first beam 351.

[0052] The fourth driving component drives the second beam 352 to move left and right on the first beam 351. The welding torch 36 moves back and forth with the second beam 352. During welding, the fourth driving component drives the welding torch 36 to move back and forth a short distance, while the pipe column 40 rotates slowly to weld. Moreover, the width of each weld 41 can be changed by making the welding torch 36 move back and forth left and right. For example, when the distance of the welding torch 36 moving back and forth is 5cm, the width of the weld is 5cm.

[0053] like Figure 1 As shown, in another preferred embodiment, the welding equipment further includes a cooling device 50 that can move with the welding torch 36 to cool the welding area of ​​the welding torch 36. The cooling device 50 is a water cooling device with a nozzle. The nozzle of the cooling device 50 is mounted on the second beam 352 and is located close to the welding torch 36. The cooling water sprayed from the nozzle can be sprayed onto the weld 41 welded by the welding torch 36 to reduce the temperature during welding.

[0054] like Figure 1As shown, in another preferred embodiment, the welding equipment further includes a fume collector 60 that can move with the welding torch 36 to collect the fumes at the welding point of the welding torch 36. The fume collector 60 can be a negative pressure fan with a fume hood. The fume hood of the negative pressure fan is mounted on the second beam 352 and is located close to the welding torch 36. The negative pressure generated by the negative pressure fan draws away the fumes at the weld 41 welded by the welding torch 36 through the fume hood.

[0055] In the description of this specification, references to terms such as "preferred embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A large-scale pipe string welding apparatus, the pipe string being a cylindrical pipe having a circular cross section, characterized by, The welding equipment includes a clamping device for supporting and limiting the tubing column, and a welding device for welding the tubing column. The clamping device includes a chuck for clamping the tubing, a rotary drive mechanism for driving the chuck to rotate, and at least one support mechanism for supporting the tubing, which is spaced apart along the length of the tubing. The welding device includes a welding torch and a welding torch driving mechanism. The welding torch driving mechanism drives the welding torch to move along the length and height of the pipe column to weld the inner and outer surfaces of the pipe column. The support mechanism includes two rotatable support wheels spaced apart along the width of the tube column. The axis of the support wheels is parallel to the axis of the tube column. When the chuck clamps and fixes the tube column, the tube column is located between the two support wheels and the outer surface of the tube column is tangent to the outer surfaces of the two support wheels. The support mechanism also includes a position sensing device for detecting the arrival of the weld seam on the support wheel, and a lifting drive for driving the two support wheels to rise and fall separately. The signal output terminal of the position sensing device is connected to the position input terminal of the controller, and the descent control terminal of the controller is connected to the descent start terminal of the lifting drive. The large tubular column welding equipment also includes at least one of the following structures; Structure 1: The positioning sensing device is an image sensor installed on the outside of the pipe column. The image sensor is located upstream of the support wheel. The controller controls the lifting drive to work based on the weld positioning information detected by the image sensor and the rotation speed of the pipe column, so that the two support wheels in the same circumference position lower the height one after the other. Structure 2: The support mechanism also includes a weld thickness detection device for detecting the weld thickness reaching the support wheel. The signal output terminal of the weld thickness detection device is connected to the weld thickness input terminal of the controller, and the descent stop control terminal of the controller is connected to the descent stop terminal of the lifting drive component.

2. A large pipe string welding apparatus according to claim 1, characterized in that, The support wheel is rotatably mounted on the mounting frame via a pivot. The mounting frame is connected to a horizontally arranged support plate via pulleys along the width direction of the column. The mounting frame is detachably fixed to the support plate via locking components. The lifting drive component is connected to the support plate and drives the support plate to move vertically.

3. The large-scale tubular column welding equipment according to claim 1, characterized in that, The welding torch drive mechanism includes a first bracket, a column mounted on the first bracket, a second bracket slidably connected to the column, a crossbeam mounted on the second bracket, a first drive member that drives the first bracket to move along the length of the column so that the crossbeam moves accordingly, and a second drive member that drives the second bracket to move vertically on the column so that the crossbeam rises and falls. The welding torch is mounted at the end of the crossbeam.

4. The large-scale tubular column welding equipment according to claim 3, characterized in that, The welding torch drive mechanism further includes a third bracket slidably connected to the first bracket, and a third drive component that drives the third bracket to move along the width direction of the column. The lower end of the column is fixed to the third bracket.

5. A large-scale tubular column welding equipment according to claim 3, characterized in that, The crossbeam is a telescopic rod structure that can extend and retract along the length of the column. The crossbeam includes a first beam body fixedly connected to the second bracket, a second beam body slidably connected to the first beam body, and a fourth driving component that drives the second beam body to slide along the length of the first beam body. The welding torch is installed at the end of the second beam body.

6. The large-scale tubular column welding equipment according to claim 1, characterized in that, The welding equipment also includes a cooling device that can move with the welding torch to cool the welding area of ​​the welding torch. And / or the welding equipment may also include a fume collector that moves with the welding torch to collect fumes from the welding point.

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