A tube welding apparatus and method of use thereof

Abstract

The present application relates to the technical fields of shipbuilding, and particularly relates to a pipe body welding device and a using method thereof. The pipe body welding device comprises a frame body and a ring body. The first chuck and the second chuck are fixed on the frame body and arranged at a relative interval. The first pipe body is clamped in the first chuck, and the second pipe body is clamped in the second chuck. The welding end of the first pipe body is arranged opposite to the welding end of the second pipe body, and the welding end of the first pipe body and the welding end of the second pipe body form a butt joint. The ring body is rotatably arranged outside the first chuck. The first welding gun and the second welding gun are symmetrically arranged at the center of the ring body and connected to the ring body. The first welding gun and the second welding gun are both arranged towards the butt joint. The rotation of the ring body can drive the first welding gun and the second welding gun to move synchronously, so as to symmetrically weld the butt joint. The moving speed of the first welding gun and the second welding gun is always kept synchronous, which reduces the demand for the welder and the skill level requirement of the welder, and is beneficial to the efficient processing of the stainless steel pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shipbuilding, in particular to a pipe welding device and a using method thereof. BACKGROUND

[0002] Shipbuilding needs to use a large number of steel pipes, especially stainless steel pipes, which need to be prefabricated and welded. The thermal conductivity of stainless steel pipe is low, the heat dissipation is slow, the local temperature rises fast, and the linear expansion coefficient is large, so it is easy to produce welding deformation during welding and cooling. In order to avoid welding deformation, two welders are usually used to weld symmetrically, so that the bending deformation of the stainless steel pipe during welding can be offset. The welding speed difference between the two welders will also cause the stainless steel pipe to produce welding deformation, so the two welders need to keep the same welding speed. Therefore, when welding the stainless steel pipe, a large number of workers are needed, and the skill level of the welders is required to be high, which is not conducive to the efficient processing of the stainless steel pipe. SUMMARY

[0003] The technical problem to be solved by the present application is that two welders are needed to weld symmetrically during the welding of the stainless steel pipe, which requires a large number of welders and has high requirements on the skill level of the welders, which is not conducive to the efficient processing of the stainless steel pipe.

[0004] In order to solve the above technical problems, the purpose of the present application is to provide a pipe welding device for butt welding a first pipe body and a second pipe body, comprising:

[0005] A frame body is provided with a first chuck and a second chuck arranged in opposite intervals, the first pipe body is clamped in the first chuck, the second pipe body is clamped in the second chuck, the welding end of the first pipe body is arranged opposite to the welding end of the second pipe body, and the butt joint is formed between the welding end of the first pipe body and the welding end of the second pipe body;

[0006] A ring body is rotatably arranged outside the first chuck, the ring body is connected with a first welding gun and a second welding gun arranged symmetrically with the center of the ring body, and the first welding gun and the second welding gun are arranged towards the butt joint.

[0007] As a preferred scheme, the ring body is fixed with a gear ring arranged coaxially with the ring body, the first chuck is fixed with a first motor, the output shaft of the first motor is connected with a first gear, and the first gear is engaged with the gear ring.

[0008] As a preferred scheme, the gear ring is arranged at one end of the ring body away from the second chuck, and the first motor is arranged at one end of the first chuck away from the second chuck.

[0009] As a preferred solution, the ring body is fixed with a first connecting frame and a second connecting frame protruding towards the second chuck;

[0010] An end of the first connecting frame is connected with a first connecting piece movable along the radial direction of the first chuck, and the first welding gun is arranged on the first connecting piece;

[0011] An end of the second connecting frame is connected with a second connecting piece movable along the radial direction of the first chuck, and the second welding gun is arranged on the second connecting piece.

[0012] As a preferred solution, the first connecting piece and the second connecting piece are both sliding rails arranged along the radial direction of the first chuck;

[0013] The first connecting piece is slidingly and guidingly connected to the first connecting frame, and a first rack parallel to the first connecting piece is fixed to one side of the first connecting piece; a second motor is fixed to the first connecting frame, and a second gear connected to the output shaft of the second motor is engaged with the first rack;

[0014] The second connecting piece is slidingly and guidingly connected to the second connecting frame, and a second rack parallel to the second connecting piece is fixed to one side of the second connecting piece; a third motor is fixed to the second connecting frame, and a third gear connected to the output shaft of the third motor is engaged with the second rack.

[0015] As a preferred solution, a first distance measuring sensor for measuring the distance between the end of the first welding gun and the pipe wall of the first pipe body is connected to the first connecting piece; and a second distance measuring sensor for measuring the distance between the end of the second welding gun and the pipe wall of the first pipe body is connected to the second connecting piece.

[0016] As a preferred solution, the pipe body welding device comprises a sealing cover arranged in the interval between the first chuck and the second chuck;

[0017] Two ends of the sealing cover are provided with a first port and a second port arranged in opposite intervals, the to-be-welded end of the first pipe body is sealingly inserted into the first port, and the to-be-welded end of the second pipe body is sealingly inserted into the second port;

[0018] The sealing cover is further provided with a first opening for the first welding gun to penetrate into the sealing cover and a second opening for the second welding gun to penetrate into the sealing cover;

[0019] A blocking rod is connected to the ring body and inserted into the first opening or the second opening, and when the ring body is rotated, the blocking rod pushes the sealing cover to rotate synchronously with the ring body.

[0020] As a preferred solution, the sealing cover comprises a hard annular part, opposite and spaced first and second sealing rings are fixed at the inner sides of the two ends of the hard annular part, the inner hole of the first sealing ring forms the first port, the inner hole of the second sealing ring forms the second port, and the first and second openings are arranged at the circumferential side of the hard annular part.

[0021] As a preferred solution, the hard annular part is made of transparent material.

[0022] As a preferred solution, the pipe body welding device comprises first and second sealing plugs, the first sealing plug is arranged at the non-welding end of the first pipe body, the second sealing plug is arranged at the non-welding end of the second pipe body, and an inert gas supply pipe is inserted into the first and / or second sealing plug.

[0023] A method for using the pipe body welding device described above, comprising the following steps:

[0024] Step S1, inserting the first and second pipe bodies into the first and second chucks respectively;

[0025] Step S2, adjusting the position of the butt joint between the first and second pipe bodies so that the butt joint is opposite the first and second welding guns;

[0026] Step S3, locking the first and second chucks;

[0027] Step S4, rotating the ring body to weld the butt joint by using the first and second welding guns.

[0028] As a preferred solution, the step S3 and the step S4 comprise:

[0029] Step S31, moving the first and second connecting members in the radial direction of the first chuck to adjust the distance between the first and second welding guns and the butt joint.

[0030] As a preferred solution, in the step S31, the distance between the first welding gun and the butt joint is adjusted by driving the second gear to rotate by using the second motor, and the distance between the second welding gun and the butt joint is adjusted by driving the third gear to rotate by using the third motor.

[0031] As a preferred solution, the step S1 and the step S2 comprise:

[0032] Step S11, placing a sealing cover in the space between the first and second chucks, inserting the to-be-welded end of the first pipe body into the first port, and inserting the to-be-welded end of the second pipe body into the second port;

[0033] The step S2 further comprises:

[0034] adjusting the position of the sealing cover so that the first opening and the second opening are opposite the first welding torch and the second welding torch, respectively;

[0035] In the step S31, when the first connecting member is moved, the first welding torch and the blocking rod are inserted into the first opening; when the second connecting member is moved, the second welding torch is inserted into the second opening.

[0036] As a preferred solution, in the step S4, the first motor is used to drive the first gear to rotate at a constant speed, so that the ring body rotates at a constant speed.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] The pipe body welding device of the present application comprises a frame body and a ring body, the frame body is fixed with a first chuck and a second chuck arranged at a relative interval, a first pipe body is clamped in the first chuck, a second pipe body is clamped in the second chuck, the to-be-welded end of the first pipe body is arranged opposite to the to-be-welded end of the second pipe body, and a butt joint is formed between the to-be-welded end of the first pipe body and the to-be-welded end of the second pipe body; the ring body is rotatably sleeved outside the first chuck, the ring body is connected with a first welding torch and a second welding torch arranged symmetrically with the center of the ring body, and the first welding torch and the second welding torch are both arranged towards the butt joint; during welding, rotating the ring body can drive the first welding torch and the second welding torch to move synchronously, so as to symmetrically weld the butt joint, and the moving speed of the first welding torch and the second welding torch always remains synchronous, thus the pipe body welding device of the present application does not need two welders to weld synchronously, which reduces the demand for welders, and through the welding device, synchronous movement of the first welding torch and the second welding torch can be ensured, which reduces the skill level requirement for welders, and is beneficial to efficient processing of stainless steel pipes. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Figure 1 is a first axonometric view of the pipe body welding device of the present application without installing the sealing cover and the first sealing plug and the second sealing plug;

[0040] Figure 2 Figure 2 is a second axonometric view of the pipe body welding device of the present application without installing the sealing cover and the first sealing plug and the second sealing plug;

[0041] Figure 3 Figure 3 is a first axonometric view of the pipe body welding device of the present application after installing the sealing cover and the first sealing plug and the second sealing plug;

[0042] Figure 4 Figure 4 is a second axonometric view of the pipe body welding device of the present application after installing the sealing cover and the first sealing plug and the second sealing plug; Figure 3 Figure 5 is a partial enlarged view of position A in Figure 4;

[0043] Figure 5 Figure 6 is a second axonometric view of the pipe body welding device of the present application after installing the sealing cover and the first sealing plug and the second sealing plug;

[0044] Figure 6 For Figure 5 Local enlarged view at B in the middle;

[0045] Figure 7 For the axial view of the sealing cover;

[0046] In the figure, 100, the first pipe body, 200, the second pipe body, 1, the frame body, 21, the first chuck, 22, the second chuck, 3, the ring body, 41, the first welding gun, 42, the second welding gun, 51, the gear ring, 52, the first motor, 53, the first gear, 54, the third connecting frame, 61, the first connecting frame, 62, the first connecting piece, 63, the first rack, 64, the second motor, 65, the second gear, 66, the first distance sensor, 67, the stop rod, 71, the second connecting frame, 72, the second connecting piece, 73, the second rack, 74, the third motor, 75, the third gear, 76, the second distance sensor, 8, the sealing cover, 81, the first port, 82, the second port, 83, the first opening, 84, the second opening, 85, the hard annular part, 86, the first sealing ring, 87, the second sealing ring, 91, the first sealing plug, 92, the second sealing plug, 93, the inert gas supply pipe. DETAILED DESCRIPTION

[0047] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0048] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. It should be understood that the terms "first", "second", etc. are used to describe various information in the present application, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information, and similarly, the "second" information can also be referred to as "first" information without departing from the scope of the present application.

[0049] The pipe body welding device of the present application is used for butt welding the first pipe body 100 and the second pipe body 200, as shown in the figure, the preferred embodiment of the pipe body welding device of the present application comprises: Figures 1 to 7

[0050] ​The frame body 1 is fixed with a first chuck 21 and a second chuck 22 arranged in opposite intervals, the first pipe body 100 is clamped in the first chuck 21, the second pipe body 200 is clamped in the second chuck 22, the to-be-welded end of the first pipe body 100 is arranged opposite to the to-be-welded end of the second pipe body 200, and the to-be-welded end of the first pipe body 100 and the to-be-welded end of the second pipe body 200 form a butt joint;

[0051] The ring body 3 is rotationally sleeved outside the first chuck 21, the ring body 3 is connected with a first welding gun 41 and a second welding gun 42 arranged in a center symmetry of the ring body 3, and the first welding gun 41 and the second welding gun 42 are both arranged towards the butt joint.

[0052] Specifically, the first chuck 21 and the second chuck 22 in the embodiment are both self-centering chucks, and the first chuck 21 and the second chuck 22 are coaxially arranged, so as to ensure that the first pipe body 100 inserted into the first chuck 21 and the second pipe body 200 inserted into the second chuck 22 can be automatically centered to a coaxial position; when in use, the first pipe body 100 and the second pipe body 200 only need to be moved along the axial direction of the first chuck 21 and the second chuck 22, so as to adjust the width of the butt joint of the first pipe body 100 and the second pipe body 200 to the position, and the butt joint is adjusted to the position opposite to the first welding gun 41 and the second welding gun 42; locking the first chuck 21 and the second chuck 22 locks the first pipe body 100 and the second pipe body 200; when welding, rotating the ring body 3 can drive the first welding gun 41 and the second welding gun 42 to move synchronously, so as to symmetrically weld the butt joint, and the moving speed of the first welding gun 41 and the second welding gun 42 always remains synchronous, so that the pipe body welding device of the present application does not need two welders to weld synchronously, which reduces the demand for welders, and the synchronous movement of the first welding gun 41 and the second welding gun 42 can be ensured through the welding device, which reduces the skill level requirement for welders, and is beneficial to efficient processing of stainless steel pipes; wherein, the ring body 3 can only rotate around the axial direction of the first chuck 21, and cannot move along the axial direction of the first chuck 21, and specifically, the inner side of the ring body 3 is provided with a flange, and the outer periphery of the first chuck 21 is provided with a ring-shaped groove, and the flange is arranged in the ring-shaped groove.

[0053] In the embodiment, in order to control the movement speed of the ring body 3 and make the ring body 3 rotate at a constant speed, the ring body 3 is fixed with a gear ring 51 coaxially arranged with the ring body 3, the first chuck 21 is fixed with a first motor 52, the output shaft of the first motor 52 is connected with a first gear 53, and the first gear 53 is engaged with the gear ring 51. In other embodiments of the present application, the ring body 3 can be manually rotated to make the ring body 3 rotate.

[0054] Further, in order to make the pipe welding device compact, the gear ring 51 is arranged at the end of the ring body 3 away from the second chuck 22, and the first motor 52 is arranged at the end of the first chuck 21 away from the second chuck 22. Specifically, the first motor 52 is connected to the end of the first chuck 21 away from the second chuck 22 through the third connecting frame 54. In order to expand the adjustment range of the rotating speed of the ring body 3, a speed reducer can be arranged on the third connecting frame 54 in other embodiments of the present application, and the output shaft of the first motor 52 is connected to the first gear 53 through the speed reducer.

[0055] In order to facilitate the welding of pipes of different specifications and to facilitate the adjustment of the distance between the first welding gun 41 and the butt joint and the distance between the second welding gun 42 and the butt joint, the first connecting frame 61 and the second connecting frame 71 protruding towards the second chuck 22 are fixed on the ring body 3. The end of the first connecting frame 61 is connected to the first connecting piece 62 which can move along the radial direction of the first chuck 21, and the first welding gun 41 is arranged on the first connecting piece 62. The end of the second connecting frame 71 is connected to the second connecting piece 72 which can move along the radial direction of the first chuck 21, and the second welding gun 42 is arranged on the second connecting piece 72.

[0056] Specifically, the first connecting piece 62 and the second connecting piece 72 are both sliding rails arranged along the radial direction of the first chuck 21. The first connecting piece 62 is slidingly and guidingly connected to the first connecting frame 61, and a first rack 63 parallel to the first connecting piece 62 is fixed on one side of the first connecting piece 62. A second motor 64 is fixed on the first connecting frame 61, and the output shaft of the second motor 64 is connected to a second gear 65 which is engaged with the first rack 63. By driving the second gear 65 to rotate through the second motor 64, the first rack 63 and the first connecting piece 62 can be driven to move along the radial direction of the first chuck 21, thereby adjusting the distance between the first welding gun 41 and the butt joint. The second connecting piece 72 is slidingly and guidingly connected to the second connecting frame 71, and a second rack 73 parallel to the second connecting piece 72 is fixed on one side of the second connecting piece 72. A third motor 74 is fixed on the second connecting frame 71, and the output shaft of the third motor 74 is connected to a third gear 75 which is engaged with the second rack 73. By driving the third gear 75 to rotate through the third motor 74, the second rack 73 and the second connecting piece 72 can be driven to move along the radial direction of the first chuck 21, thereby adjusting the distance between the second welding gun 42 and the butt joint.

[0057] In order to control the distance between the first welding torch 41 and the first pipe body 100, the first connecting member 62 is connected with a first distance measuring sensor 66 for measuring the distance between the end of the first welding torch 41 and the pipe wall of the first pipe body 100; in order to control the distance between the second welding torch 42 and the first pipe body 100, the second connecting member 72 is connected with a second distance measuring sensor 76 for measuring the distance between the end of the second welding torch 42 and the pipe wall of the first pipe body 100.

[0058] In order to avoid high-temperature oxidation at the weld, inert gas needs to be introduced into the first pipe body 100 and the second pipe body 200. In the embodiment, the pipe body welding device comprises a sealing cover 8 arranged in the interval between the first chuck 21 and the second chuck 22; the sealing cover 8 is provided with a first port 81 and a second port 82 arranged in opposite intervals at two ends thereof, the to-be-welded end of the first pipe body 100 is sealingly inserted into the first port 81, and the to-be-welded end of the second pipe body 200 is sealingly inserted into the second port 82; the sealing cover 8 is further provided with a first opening 83 for the first welding torch 41 to penetrate into the sealing cover 8 and a second opening 84 for the second welding torch 42 to penetrate into the sealing cover 8; the ring body 3 is connected with a blocking rod 67 inserted into the first opening 83 or the second opening 84, and the blocking rod 67 pushes the sealing cover 8 to rotate synchronously with the ring body 3 when the ring body 3 is rotated. The butt joint is located in the sealing cover 8, and inert gas can overflow out of the sealing cover 8 from the first opening 83 and the second opening 84 during the welding process, the first welding torch 41 is arranged at the first opening 83, the second welding torch 42 is arranged at the second opening 84, the inert gas flowing into the first pipe body 100 and the second pipe body 200 converges into the sealing cover 8 and then flows outwards from the first opening 83 and the second opening 84, thereby avoiding the entry of external air into the sealing cover, and the blocking rod 67 can rotate synchronously with the ring body 3, thereby pushing the sealing cover 8 to rotate synchronously with the ring body 3, so that the first opening 83 and the second opening 84 can move synchronously with the first welding torch 41 and the second welding torch 42, and the closed-loop welding of the annular butt joint is ensured.

[0059] The sealing cover 8 comprises a hard annular portion 85, the inner sides of both ends of the hard annular portion 85 are fixed with a first sealing ring 86 and a second sealing ring 87 arranged in opposite intervals, the inner hole of the first sealing ring 86 forms the first port 81, the inner hole of the second sealing ring 87 forms the second port 82, and the first opening 83 and the second opening 84 are both arranged on the circumferential side of the hard annular portion 85. Specifically, the first sealing ring 86 and the second sealing ring 87 are both high-temperature-resistant sealing rings, and the arrangement of the first sealing ring 86 and the second sealing ring 87 not only ensures the sealing between the first port 81 and the first pipe body 100 and the sealing between the second port 82 and the second pipe body 200, but also ensures that the sealing cover 8 can rotate relative to the first pipe body 100 and the second pipe body 200.

[0060] In order to observe the welding effect of the butt joint, the hard annular part 85 is made of transparent material. Specifically, in the embodiment, the hard annular part 85 is made of high-temperature-resistant glass, and in other embodiments of the application, the hard annular part 85 can be made of high-temperature-resistant plastic.

[0061] In order to introduce inert gas into the first pipe body 100 and the second pipe body 200, in the embodiment, the pipe body welding device comprises a first sealing plug 91 and a second sealing plug 92, the first sealing plug 91 is plugged into the non-welding end of the first pipe body 100, and the second sealing plug 92 is plugged into the non-welding end of the second pipe body 200, and the inert gas supply pipe 93 is inserted into the first sealing plug 91 and / or the second sealing plug 92.

[0062] An embodiment of a method for using the above-mentioned pipe body welding device, comprising the following steps:

[0063] Step S1, inserting the first pipe body 100 and the second pipe body 200 into the first chuck 21 and the second chuck 22 respectively;

[0064] Step S2, adjusting the position of the butt joint between the first pipe body 100 and the second pipe body 200 so that the butt joint is opposite to the first welding gun 41 and the second welding gun 42;

[0065] Step S3, locking the first chuck 21 and the second chuck 22;

[0066] Step S4, rotating the ring body 3, and welding the butt joint by using the first welding gun 41 and the second welding gun 42.

[0067] Among them, between step S3 and step S4, comprising:

[0068] Step S31, moving the first connecting piece 62 and the second connecting piece 72 along the radial direction of the first chuck 21 to adjust the distance between the first welding gun 41 and the second welding gun 42 and the butt joint.

[0069] Specifically, in step S31, the second motor 64 is used to drive the second gear 65 to rotate to adjust the distance between the first welding gun 41 and the butt joint, and the third motor 74 is used to drive the third gear 75 to rotate to adjust the distance between the second welding gun 42 and the butt joint.

[0070] After step S1 and before step S2, comprising:

[0071] Step S11, placing the sealing cover 8 in the interval between the first chuck 21 and the second chuck 22, inserting the to-be-welded end of the first pipe body 100 into the first port 81, and inserting the to-be-welded end of the second pipe body 200 into the second port 82;

[0072] Step S2 further comprises:

[0073] The position of the sealing cover 8 is adjusted so that the first opening 83 and the second opening 84 are opposite the first welding gun 41 and the second welding gun 42, respectively.

[0074] In step S31, the first connecting piece 62 is moved so that the first welding gun 41 and the blocking rod 67 are inserted into the first opening 83, and the second connecting piece 72 is moved so that the second welding gun 42 is inserted into the second opening 84.

[0075] Further, in step S2, the position of the butt joint is observed through the transparent hard annular part 85. In the embodiment, the first distance measuring sensor 66 and the second distance measuring sensor 76 are opposite the first opening 83 and the second opening 84, respectively, and are arranged opposite the first pipe body 100, and in step S31, the distance between the first welding gun 41 and the second welding gun 42 and the butt joint is ensured by the first distance measuring sensor 66 and the second distance measuring sensor 76.

[0076] In the embodiment, in step S4, the first motor 52 is used to drive the first gear 53 to rotate at a constant speed, so that the ring body 3 rotates at a constant speed. In the embodiment, the ends of the welding wires away from the welding guns are connected with automatic wire feeding devices, and the wire feeding speed of the automatic wire feeding devices is adjusted according to the rotating speed of the ring body 3.

[0077] In summary, the pipe body welding device comprises a frame body 1 and a ring body 3, the frame body 1 is fixed with a first chuck 21 and a second chuck 22 arranged opposite and spaced apart, a first pipe body 100 is clamped in the first chuck 21, and a second pipe body 200 is clamped in the second chuck 22, the to-be-welded end of the first pipe body 100 is arranged opposite the to-be-welded end of the second pipe body 200, and the to-be-welded end of the first pipe body 100 and the to-be-welded end of the second pipe body 200 form a butt joint, the ring body 3 is rotatably arranged outside the first chuck 21, the ring body 3 is connected with a first welding gun 41 and a second welding gun 42 arranged symmetrically with the center of the ring body 3, and the first welding gun 41 and the second welding gun 42 are both arranged towards the butt joint; during welding, rotating the ring body 3 can drive the first welding gun 41 and the second welding gun 42 to move synchronously, so as to symmetrically weld the butt joint, and the moving speed of the first welding gun 41 and the second welding gun 42 always remains synchronous, so that the pipe body welding device does not need two welders to weld synchronously, the demand for welders is reduced, the skill level requirement for welders is reduced, and the stainless steel pipe can be efficiently processed.

[0078] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A tube welding apparatus for butt welding a first tube (100) and a second tube (200), characterized in that, The utility model relates to a welding device for pipe butt joint, which comprises: a frame (1) having a first chuck (21) and a second chuck (22) fixed thereon and arranged in opposite directions, a first pipe body (100) clamped in the first chuck (21), a second pipe body (200) clamped in the second chuck (22), a butt joint formed between the welding end of the first pipe body (100) and the welding end of the second pipe body (200); a ring body (3) rotatably sleeved outside the first chuck (21), the ring body (3) being connected with a first welding gun (41) and a second welding gun (42) arranged in the center of the ring body (3) in a symmetrical manner, the first welding gun (41) and the second welding gun (42) being arranged towards the butt joint, the ring body (3) being fixed with a first connecting frame (61) and a second connecting frame (71) protruding towards the second chuck (22); an end of the first connecting frame (61) being connected with a first connecting piece (62) movable along the radial direction of the first chuck (21), the first welding gun (41) being arranged on the first connecting piece (62); an end of the second connecting frame (71) being connected with a second connecting piece (72) movable along the radial direction of the first chuck (21), the second welding gun (42) being arranged on the second connecting piece (72); the first connecting piece (62) and the second connecting piece (72) being sliding rails arranged along the radial direction of the first chuck (21); the first connecting piece (62) being slidingly connected to the first connecting frame (61), one side of the first connecting piece (62) being fixed with a first rack (63) parallel to the first connecting piece (62), the first connecting frame (61) being fixed with a second motor (64), an output shaft of the second motor (64) being connected with a second gear (65), the second gear (65) being engaged with the first rack (63); the second connecting piece (72) being slidingly connected to the second connecting frame (71), one side of the second connecting piece (72) being fixed with a second rack (73) parallel to the second connecting piece (72), the second connecting frame (71) being fixed with a third motor (74), an output shaft of the third motor (74) being connected with a third gear (75), the third gear (75) being engaged with the second rack (73).

2. The tube welding apparatus according to claim 1, characterized by the ring body (3) being fixed with a gear ring (51) coaxially arranged with the ring body (3), the first chuck (21) being fixed with a first motor (52), an output shaft of the first motor (52) being connected with a first gear (53), the first gear (53) being engaged with the gear ring (51).

3. The tube welding apparatus according to claim 2, wherein the gear ring (51) being arranged at one end of the ring body (3) away from the second chuck (22), the first motor (52) being arranged at one end of the first chuck (21) away from the second chuck (22).

4. The tube welding apparatus of claim 1, wherein A first distance measuring sensor (66) is connected to the first connecting member (62) for measuring the distance between the end of the first welding torch (41) and the pipe wall of the first pipe body (100); and a second distance measuring sensor (76) is connected to the second connecting member (72) for measuring the distance between the end of the second welding torch (42) and the pipe wall of the first pipe body (100).

5. The tube welding apparatus of claim 1, wherein The pipe welding device comprises a sealing cover (8) arranged in the interval between the first chuck (21) and the second chuck (22); The sealing cover (8) is provided with a first port (81) and a second port (82) arranged at opposite ends, the to-be-welded end of the first pipe body (100) is sealingly inserted into the first port (81), and the to-be-welded end of the second pipe body (200) is sealingly inserted into the second port (82); The sealing cover (8) is further provided with a first opening (83) for the first welding torch (41) to penetrate into the sealing cover (8) and a second opening (84) for the second welding torch (42) to penetrate into the sealing cover (8); The ring body (3) is connected with a blocking rod (67) inserted into the first opening (83) or the second opening (84), and when the ring body (3) is rotated, the blocking rod (67) pushes the sealing cover (8) to rotate synchronously with the ring body (3).

6. The tube welding apparatus of claim 5, wherein The sealing cover (8) comprises a hard annular portion (85), the inner sides of both ends of the hard annular portion (85) are fixed with a first sealing ring (86) and a second sealing ring (87) arranged at opposite ends, the inner hole of the first sealing ring (86) forms the first port (81), the inner hole of the second sealing ring (87) forms the second port (82), and the first opening (83) and the second opening (84) are both arranged on the circumferential side of the hard annular portion (85).

7. The tube welding apparatus of claim 6, wherein The hard annular portion (85) is made of transparent material.

8. The tube welding apparatus of claim 5, wherein, The pipe welding device comprises a first sealing plug (91) and a second sealing plug (92), the first sealing plug (91) is inserted into the non-welding end of the first pipe body (100), the second sealing plug (92) is inserted into the non-welding end of the second pipe body (200), and the first sealing plug (91) and / or the second sealing plug (92) sealingly insert an inert gas supply pipe (93).

9. A method of using the pipe body welding apparatus of claim 1, wherein, The method comprises the following steps: Step S1, inserting the first pipe body (100) and the second pipe body (200) into the first chuck (21) and the second chuck (22) respectively; Step S2, adjusting the position of the butt joint between the first pipe body (100) and the second pipe body (200) so that the butt joint is opposite to the first welding torch (41) and the second welding torch (42); Step S3, locking the first chuck (21) and the second chuck (22); Step S4, rotating the ring body (3) to weld the butt joint by using the first welding torch (41) and the second welding torch (42).

10. The method of using a pipe body welding apparatus of claim 9, wherein, Between the step S3 and the step S4, Step S31, moving the first connecting member (62) and the second connecting member (72) along the radial direction of the first chuck (21) to adjust the distance between the first welding gun (41) and the second welding gun (42) and the butt joint.

11. The method of using a pipe body welding apparatus of claim 10, wherein, In the step S31, the second motor (64) is used to drive the second gear (65) to rotate to adjust the distance between the first welding gun (41) and the butt joint, and the third motor (74) is used to drive the third gear (75) to rotate to adjust the distance between the second welding gun (42) and the butt joint.

12. The method of using a tube welding apparatus of claim 10, wherein, The pipe welding device comprises a sealing cover (8) arranged in the interval between the first chuck (21) and the second chuck (22); The sealing cover (8) is provided with a first port (81) and a second port (82) arranged in opposite intervals at two ends thereof, the to-be-welded end of the first pipe body (100) is sealingly inserted into the first port (81), and the to-be-welded end of the second pipe body (200) is sealingly inserted into the second port (82); The sealing cover (8) is further provided with a first opening (83) for the first welding gun (41) to penetrate into the sealing cover (8) and a second opening (84) for the second welding gun (42) to penetrate into the sealing cover (8); The ring body (3) is connected with a blocking rod (67) inserted into the first opening (83) or the second opening (84), and when the ring body (3) is rotated, the blocking rod (67) pushes the sealing cover (8) to rotate synchronously with the ring body (3); The step S1 is followed by the step S2, which comprises: Step S11, placing the sealing cover (8) in the interval between the first chuck (21) and the second chuck (22), inserting the to-be-welded end of the first pipe body (100) into the first port (81), and inserting the to-be-welded end of the second pipe body (200) into the second port (82); The step S2 further comprises: Adjusting the position of the sealing cover (8) so that the first opening (83) and the second opening (84) are opposite to the first welding gun (41) and the second welding gun (42) respectively; In the step S31, when the first connecting member (62) is moved, the first welding gun (41) and the blocking rod (67) are both inserted into the first opening (83), and when the second connecting member (72) is moved, the second welding gun (42) is inserted into the second opening (84).

13. The method of using a pipe body welding apparatus of claim 9, wherein, The ring body (3) is fixed with a gear ring (51) coaxially arranged with the ring body (3), the first chuck (21) is fixed with a first motor (52), the output shaft of the first motor (52) is connected with a first gear (53), and the first gear (53) is engaged with the gear ring (51); In the step S4, the first motor (52) is used to drive the first gear (53) to rotate at a constant speed, so that the ring body (3) rotates at a constant speed.

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