Full-automatic stainless steel tube argon arc welding special equipment

Abstract

The present application relates to the technical field of stainless steel pipe welding, and discloses a special full-automatic argon arc welding device for stainless steel pipes, which comprises an automatic argon arc welding machine, a fixed pipe, two air bag sealing assemblies symmetrically arranged on the outer wall of the fixed pipe, an air bag sleeve fixedly connected to the outer wall of the fixed pipe, a fixed ring fixedly connected to one end of the air bag sleeve, a plurality of air release holes formed in the fixed ring, a movable ring slidingly connected to the outer wall of the other end of the air bag sleeve, and an air bag sleeve fixedly connected between the fixed ring and the movable ring. A gas delivery pipe is arranged in the fixed pipe and communicates with the air bag sealing assembly. The air bag sleeve is inflated by entering the air bag sealing assembly, the movable ring is axially moved by a driving mechanism, the air bag sleeve can be radially stretched until abutting against the inner wall of the stainless steel pipe, the space required for filling argon in the pipe is greatly reduced, the stretching of the air bag sleeve can be self-adapted to pipes of different sizes, the operation convenience is improved, the use amount of argon is reduced, and the welding efficiency of the stainless steel pipe is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel pipe welding, in particular to a full-automatic special equipment for argon arc welding of stainless steel pipes. BACKGROUND

[0002] Stainless steel pipe is a material extremely sensitive to welding process, and its corrosion resistance is extremely vulnerable to damage due to oxidation in the welding process. Argon arc welding can effectively guarantee the welding quality by replacing air with argon gas system; and the automatic equipment can accurately reproduce each welding parameter, including current, voltage, welding speed, swing frequency and gas flow, so as to ensure that each inch of weld and each workpiece can reach the completely consistent high quality standard.

[0003] In the automatic argon arc welding process, the argon gas sprayed by the nozzle mainly protects the front of the weld, that is, the molten pool and the area where the tungsten electrode is located. However, for pipes with large diameter or thick wall, this protection method has obvious limitations: when the pipe space is large, the argon gas on the front cannot cover the inner wall through diffusion, so that the inner wall in the deep part of the pipe is almost in an air environment and is extremely easy to react with oxygen under high temperature conditions; and the inner wall of the thick-walled pipe will be in a high temperature state for a long time due to the characteristics of heat conduction, and only relying on the protection of argon gas on the front cannot prevent oxygen from invading the inner wall.

[0004] At present, the common method to solve this problem is to block the two ends of the pipe and fill argon gas into the pipe to replace the original air. However, in actual operation, the blocking of the pipe head usually uses flexible materials such as plastic bags and adhesive tape, which not only is cumbersome to operate, but also these materials cannot be reused. At the same time, when the pipe space is large, it is necessary to pre-fill argon gas into the pipe for 5-10 seconds to ensure that the air in the pipe is exhausted, which will undoubtedly cause a large amount of waste of argon gas, and also increase the frequency of argon gas supplement of the equipment, thereby adversely affecting the welding efficiency. SUMMARY

[0005] In view of the problems of existing technology that the pipe head is blocked and argon gas is wasted, a full-automatic special equipment for argon arc welding of stainless steel pipes is proposed.

[0006] The purpose is to: through the inflation of the air bag sleeve, the movable ring pushes the air bag sleeve to expand to contact with the inner wall of the pipe, realizing the blocking of the pipeline while reducing the inner space of the pipe filled with argon gas, and reducing the waste of argon gas.

[0007] The technical scheme of the present application is a full-automatic stainless steel pipe argon arc welding special equipment, which comprises an automatic argon arc welding machine, and further comprises a fixed pipe, the outer wall of the fixed pipe is symmetrically provided with two air bag sealing assemblies, the air bag sealing assembly comprises a pipe sleeve fixedly connected to the outer wall of the fixed pipe, one end of the pipe sleeve is fixedly connected with a fixed ring, a plurality of air release holes are formed in the fixed ring, the other end of the outer wall is slidably connected with a movable ring, the fixed ring and the movable ring are jointly fixedly connected with an air bag sleeve, a gas conveying pipe is arranged in the fixed pipe, the gas conveying pipe is in communication with the air bag sealing assembly, and one end of the gas conveying pipe penetrates out of the fixed pipe and is connected with the argon gas conveying equipment of the automatic argon arc welding machine.

[0008] The outer wall of the movable ring is annularly and equidistantly provided with a plurality of supporting members, a driving mechanism is arranged in the fixed pipe, the driving mechanism comprises a connecting shaft, a plurality of driving arms are drivingly connected to the connecting shaft, one end of the driving arm is hingedly connected with a driving block, and the driving block is used to drive the supporting member to radially expand.

[0009] Further, two branch pipes are fixedly connected in communication on the gas conveying pipe, and the branch pipes are fixedly penetrated through the fixed pipe and the pipe sleeve.

[0010] Further, a plurality of guide strips are fixedly arranged on the outer wall of the pipe sleeve in a ring shape and at equal intervals, and the movable ring is provided with an adapted guide groove at a position corresponding to the guide strip.

[0011] Further, the supporting member comprises two rotating columns rotatably connected with the movable ring, a folding arm is fixedly connected to the rotating column, a connecting seat is jointly connected between the two folding arms, and a supporting wheel is fixedly installed on the connecting seat.

[0012] Further, the air bag sleeve is in an elliptical structure, and the diameters formed by the plurality of supporting wheels are greater than the maximum diameter of the air bag sleeve.

[0013] Further, the connecting shaft is axially rotatably connected with the fixed pipe, one end of the connecting shaft penetrates out of the fixed pipe and is fixedly connected with a hand wheel, two worms are fixedly connected to the outer wall of the connecting shaft, a plurality of worm gears are meshingly connected to the worms, a fixed seat is rotatably connected to one side of the worm gear, the fixed seat is fixedly connected to the inner pipe wall of the fixed pipe, and the other side of the worm gear is fixedly connected with the driving arm.

[0014] Further, the driving block is arranged between the two rotating columns, a driving rod is fixedly connected to one side of the driving block facing the rotating column, an arc-shaped groove is formed in the outer wall of the rotating column, and the driving rod is slidably arranged in the arc-shaped groove.

[0015] Further, a groove adapted to the rotating column is formed in the end of the driving block.

[0016] Further, the slidingly arranged in the air vent is provided with a guide block in arc structure, the guide block cross section is in right angle trapezoidal structure, the guide block slope is away from the fixed pipe side, and the guide block and the movable ring are jointly fixed and connected with the elastic piece.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. By inflating the air bag sleeve into the air bag sealing assembly by argon, the driving mechanism drives the movable ring to move axially, so that the air bag sleeve can be radially expanded until abutting against the inner wall of the stainless steel pipe, greatly reducing the space required for filling argon in the pipe, and the expansion of the air bag sleeve can be self-adapted to different sizes of pipes, and can be reused, improving the operation convenience while reducing the use amount of argon, which helps to improve the welding efficiency of the stainless steel pipe.

[0019] 2. The driving mechanism first drives the support to abut against the inner pipe wall, so that the air bag sleeve axis coincides with the pipe axis, and when the air bag sleeve is radially expanded, it can uniformly contact the inner pipe wall, improving the sealing performance of the pipe, preventing argon leakage, and further reducing the use amount of argon.

[0020] 3. The slope of the guide block can make the argon directly flow to the welding position, and the cooperation of multiple guide blocks can make the argon flow in a ring-shaped diffusion trend, so that the argon can uniformly cover the ring-shaped welding position, further improving the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic view of the overall structure of the present application;

[0022] Figure 2 It is a fixed pipe and air bag sealing assembly structure schematic view of the present application;

[0023] Figure 3 It is an air bag sealing assembly structure cross section schematic view of the present application;

[0024] Figure 4 It is a support structure schematic view of the present application;

[0025] Figure 5 It is a driving mechanism structure schematic view of the present application;

[0026] Figure 6 It is a driving block and rotating column structure schematic view of the present application;

[0027] Figure 7 It is a driving rod and rotating groove structure schematic view of the present application;

[0028] Figure 8 It is a fixed ring and guide block structure cross section schematic view of the present application;

[0029] Figure 9 A schematic diagram of the flow guide block structure of the present application.

[0030] In the figure:

[0031] 1, automatic argon arc welding machine; 2, fixed tube; 3, air bag sealing assembly; 31, tube sleeve; 32, fixed ring; 33, movable ring; 34, air bag sleeve; 35, air hole; 4, support; 41, rotating column; 42, folding arm; 43, connecting seat; 44, support wheel; 45, arc-shaped groove; 5, flow guide block; 6, gas conveying pipe; 7, branch pipe; 8, driving mechanism; 81, connecting shaft; 82, driving arm; 83, hand wheel; 84, worm; 85, worm gear; 86, driving block; 87, driving rod. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0033] Example 1

[0034] Referring to Figures 1-5 , for the first embodiment of the present application, a full-automatic stainless steel tube argon arc welding special equipment is provided, which comprises an automatic argon arc welding machine 1, and further comprises a fixed tube 2, the outer wall of the fixed tube 2 is symmetrically provided with two air bag sealing assemblies 3, the air bag sealing assembly 3 comprises a tube sleeve 31 fixedly connected to the outer wall of the fixed tube 2, one end of the tube sleeve 31 is fixedly connected with a fixed ring 32, a plurality of air holes 35 are formed in the fixed ring 32, the other end of the tube sleeve 31 is slidably connected with a movable ring 33, the fixed ring 32 and the movable ring 33 are jointly fixedly connected with an air bag sleeve 34, the fixed tube 2 is provided with a gas conveying pipe 6, the gas conveying pipe 6 is in communication with the air bag sealing assembly 3, and one end of the gas conveying pipe 6 penetrates out of the fixed tube 2 and is connected with the argon gas conveying equipment of the automatic argon arc welding machine 1;

[0035] The outer wall of the movable ring 33 is annularly and equidistantly provided with a plurality of supports 4, the fixed tube 2 is provided with a driving mechanism 8, the driving mechanism 8 comprises a connecting shaft 81, a plurality of driving arms 82 are drivingly connected to the connecting shaft 81, one end of the driving arm 82 is hingedly connected with a driving block 86, and the driving block 86 is used to drive the support 4 to expand radially.

[0036] Specifically, the sleeve 31, the fixed ring 32, the movable ring 33 and the air bag sleeve 34 jointly form a relatively sealed space. In use, the fixed tube 2 is first placed in the stainless steel pipe to be welded, the connecting shaft 81 is operated to drive the driving arm 82 to move, the driving block 86 drives the support 4 to expand radially, and all the supports 4 on the movable ring 33 are expanded synchronously and gradually abut against the inner wall of the stainless steel pipe. When the support 4 cannot continue to expand, the gas conveying pipe 6 starts to convey argon into the air bag sealing assembly 3, and the connecting shaft 81 continues to rotate to drive the driving block 86 to push the movable ring 33 to slide on the sleeve 31, so that the air bag sleeve 34 is compressed in the axial direction and extends radially at the same time until it abuts against the inner wall of the stainless steel pipe. At this time, the two air bag sealing assemblies 3 cooperate with each other to effectively seal the internal space of the stainless steel pipe, and then the excess argon is discharged through the gas vent hole 35 in the fixed ring 32 and accurately sprayed to the welding position.

[0037] Through the double fixing mode of the support 4 and the air bag sleeve 34, the device can stably adhere to the inner wall of the stainless steel pipe, ensuring reliable sealing effect and avoiding large leakage of argon during welding; the excess argon is directed to the welding position through the gas vent hole 35, so that a stable argon protective atmosphere is formed in the welding area, the oxidation of the weld is reduced, the welding quality is improved, and the efficiency and consistency of the welding operation are also improved.

[0038] The air bag sleeve 34 is made of a flexible material that can be stretched and deformed. When the air bag sealing assembly 3 is inflated, the air bag sleeve 34 extends radially and expands. The deformable property of the air bag sleeve 34 enables the air bag sleeve 34 to adapt to different sizes of stainless steel pipes and tightly adhere to the inner wall of the stainless steel pipe, thereby saving material waste in traditional sealing and reducing the space for filling argon in the pipe.

[0039] Referring to Figure 3 The gas conveying pipe 6 is fixedly connected with two branch pipes 7, and the branch pipes 7 penetrate through the fixed tube 2 and the sleeve 31.

[0040] Specifically, when the argon gas conveying device of the automatic argon arc welding machine 1 supplies gas to the gas conveying pipe 6, the argon gas can enter the two air bag sealing assemblies 3 through the two branch pipes 7, so that the air bag sleeve 34 is inflated and expanded.

[0041] Referring to Figure 3 A plurality of guide strips are fixedly arranged on the outer wall of the sleeve 31 in a ring shape at equal intervals, and the movable ring 33 is provided with adaptive guide grooves at positions corresponding to the guide strips.

[0042] Specifically, the inner wall of the movable ring 33 is in sliding contact with the outer wall of the sleeve 31, and the movable ring 33 slides straightly along the axial direction of the sleeve 31 through the cooperation of the guide strips and the guide grooves, so as to drive the radial deformation of the air bag sleeve 34.

[0043] With reference to Figure 4 The support 4 comprises two rotating columns 41 rotatably connected with the movable ring 33, and the rotating columns 41 are fixedly connected with folding arms 42, the two folding arms 42 are jointly connected with a connecting seat 43, and the connecting seat 43 is fixedly installed with support wheels 44.

[0044] Specifically, when the two rotating columns 41 are oppositely rotated, the two folding arms 42 are rotated and stretched under the limitation of the connecting seat 43, and at the same time drive the support wheels 44 to move radially until abutting against the inner pipe wall. By means of the support 4, the axis of the fixed pipe 2 can be kept coinciding with the axis of the stainless steel pipe, so that when the air bag sleeve 34 is radially deformed, it can uniformly abut against the inner pipe wall, thereby effectively improving the sealing effect.

[0045] The folding arm 42 is composed of two mutually hinged arc-shaped plates, when the two rotating columns 41 are oppositely rotated, the movable ends of the two arc-shaped plates connected with the corresponding rotating columns 41 are close to each other, and under the limitation of the connecting seat 43, the two arc-shaped plates connected with the connecting seat 43 are driven to rotate by the arc-shaped plates connected therewith, so that the connecting seat 43 translates radially. The folding arm 42 can be attached to the movable ring 33 in the folded state, thereby maximizing the occupied space and enabling it to be placed in a smaller pipeline.

[0046] With reference to Figure 2 The air bag sleeve 34 is in an elliptical structure, and the diameters formed by the plurality of support wheels 44 are greater than the maximum diameter of the air bag sleeve 34.

[0047] Specifically, the air bag sleeve 34 is in a minimum compressed state when not inflated, the plurality of support wheels 44 cooperate to move the fixed pipe 2 into the stainless steel pipe, and the air bag sleeve 34 is suspended to avoid abrasion.

[0048] Embodiment 2

[0049] With reference to Figure 5 This is the second embodiment of the application, which is different from the first embodiment: the connecting shaft 81 is axially rotatably connected with the fixed pipe 2, one end of the connecting shaft 81 penetrates out of the fixed pipe 2 and is fixedly connected with a hand wheel 83, the outer wall of the connecting shaft 81 is fixedly connected with two worms 84, the worms 84 are meshingly connected with a plurality of worm gears 85, one side of the worm gears 85 is rotatably connected with a fixed seat, the fixed seat is fixedly connected to the inner pipe wall of the fixed pipe 2, and the other side of the worm gears 85 is fixedly connected with the driving arm 82.

[0050] Specifically, rotating the hand wheel 83 drives the rotating of the connecting shaft 81, and the two worm gears 84 on the outer wall of the connecting shaft 81 rotate synchronously, thereby driving the rotation of the plurality of worm gears 85 engaged therewith. Since the worm gears 85 are rotatably connected to the inner wall of the fixed tube 2 through the fixed seat on one side, the rotation of the worm gears 85 drives the driving arm 82 fixedly connected on the other side to move, so that the driving arm 82 pushes the driving block 86 to move. The driving block 86 is connected to the support 4, and under the driving of the driving block 86, the support 4 is radially stretched, and finally the support wheel 44 abuts against the inner wall of the tube.

[0051] The driving arm 82 is composed of two mutually hinged connecting rods, and the two worm gears 84 are symmetrically arranged. When the connecting shaft 81 rotates, the driving arms 82 on both sides move in opposite directions, so that the two movable rings 33 move close to each other, and the air bag sleeve 34 is deformed to contact the inner wall of the tube, thereby maximizing the reduction of the argon filling space in the tube.

[0052] Referring to Figure 6 , Figure 7 The driving block 86 is arranged between the two rotating columns 41, and the driving rod 87 is fixedly connected to the side of the driving block 86 facing the rotating column 41. The rotating column 41 has an arc-shaped groove 45 formed in the outer wall thereof, and the driving rod 87 is slidingly arranged in the arc-shaped groove 45.

[0053] Specifically, when the driving block 86 moves, the driving rod 87 on the side of the driving block 86 facing the rotating column 41 slides along the arc-shaped groove 45 of the rotating column 41, and in the process of sliding, a driving force is formed on the rotating column 41, so that the two rotating columns 41 rotate towards each other, thereby driving the support 4 to radially stretch.

[0054] Referring to Figure 6 A groove is formed in the end of the driving block 86, and the groove is adapted to the rotating column 41.

[0055] Specifically, the groove in the end of the driving block 86 is in sliding contact with the outer wall of the rotating column 41, and the sliding cooperation of the groove and the rotating column 41 achieves limiting, so that the driving block 86 can stably slide along the axial direction of the rotating column 41.

[0056] It can be understood that when the support 4 radially extends to abut against the inner wall of the tube, the support 4 cannot continue to stretch, and at this time, the driving block 86 cannot further drive the rotating column 41 to rotate. In this case, the driving force generated by the driving block 86 is transmitted to the movable ring 33 through the support 4, thereby driving the movable ring 33 to slide on the sleeve 31, and finally realizing the radial deformation of the air bag sleeve 34. The remaining structure is the same as that of the first embodiment.

[0057] Embodiment 3

[0058] Referring to Figure 8 , Figure 9For the third embodiment of the present application, which is different from the second embodiment, a flow guide block 5 in an arc structure is slidably arranged in the air vent hole 35. The cross section of the flow guide block 5 is in a right-angled trapezoidal structure, and the inclined surface of the flow guide block 5 is arranged away from the fixed tube 2. The flow guide block 5 and the movable ring 33 are jointly fixedly connected with an elastic member.

[0059] Specifically, under the pulling force of the elastic member, the flow guide block 5 is in abutting cooperation with the air vent hole 35. When the air pressure in the gas bag sealing assembly 3 is greater than the elastic force of the elastic member, the air pressure pushes the flow guide block 5 to slide flat, so that the air vent hole 35 is opened, and the argon gas moves to the pipe welding position after being guided by the inclined surface of the flow guide block 5, so as to realize air replacement for the welding position. The cooperation of the elastic member and the flow guide block 5 forms a one-way valve structure on the one hand, so that the argon gas in the gas bag sealing assembly 3 is automatically discharged after reaching a certain air pressure value. At the same time, the flow guide block 5 guides the flow of argon gas, so that the argon gas is directly blown to the welding position in a ring shape, avoiding the turbulence of the airflow in the pipe, so that the argon gas can effectively contact all the girth welding positions, and the welding quality is further improved.

[0060] The inclination angle of the inclined surface of the flow guide block 5 is reasonably designed, so that the argon gas discharged from the air vent hole 35 can be accurately guided to the pipe welding position, so as to ensure that the argon gas can directly reach the welding position, and to provide accurate airflow support for air replacement. The arc structure of the inclined surface is matched with the girth welding position of the pipe. When the argon gas flows along the inclined surface, it will diffuse in all directions under the guidance of the inclined surface, forming a ring-shaped airflow diffusion trend. This diffusion effect enables the argon gas to more evenly cover the entire girth welding position, avoiding the situation that the argon gas supply is insufficient in the local area, and ensuring that all positions of the welding position can be in full contact with the argon gas, thereby improving the comprehensiveness of air replacement.

[0061] Among them, the elastic member is a spring with elastic expansion, and in this technical solution, a metal spring is preferentially used, and the rest of the structure is the same as that of embodiment 2.

[0062] In combination with embodiments 1-3, the working principle of the present application is as follows: the fixed tube 2 is placed in the stainless steel pipe to be welded. When the hand wheel 83 is rotated, the connecting shaft 81 drives the driving arm 82 to move the driving block 86, the driving rod 87 slides along the arc-shaped groove 45 of the rotating column 41, the rotating column 41 of the supporting member 4 is oppositely rotated, the folding arm 42 is stretched to drive the supporting wheel 44 to move radially and abut against the inner pipe wall, so as to ensure that the fixed tube 2 is coaxial with the stainless steel pipe. Subsequently, the gas conveying pipe 6 sends argon gas to the two gas bag sealing assemblies 3 through the branch pipe 7, and at the same time, the connecting shaft 81 continues to rotate, the driving block 86 pushes the movable ring 33 to slide along the guide bar of the pipe sleeve 31, so that the gas bag sleeve 34 is axially compressed and radially expanded, and tightly abuts against the inner pipe wall, so as to realize the sealing of the inner space of the pipe. The excess argon gas pushes open the flow guide block 5, and is discharged through the air vent hole 35, and forms a ring-shaped airflow under the guidance of the inclined surface of the flow guide block 5, and is accurately sprayed to the welding position to form a protective atmosphere, thereby improving the welding quality.

[0063] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A fully automatic special equipment for argon arc welding of stainless steel pipes, including an automatic argon arc welding machine (1), characterized in that, It also includes a fixed tube (2), on which two airbag sealing assemblies (3) are symmetrically arranged on the outer wall of the fixed tube (2). The airbag sealing assembly (3) includes a sleeve (31) fixedly connected to the outer wall of the fixed tube (2). A fixed ring (32) is fixedly connected to one end of the sleeve (31). Multiple vent holes (35) are opened on the fixed ring (32). A movable ring (33) is slidably connected to the outer wall of the other end. An airbag sleeve (34) is fixedly connected between the fixed ring (32) and the movable ring (33). A gas supply pipe (6) is provided inside the fixed tube (2). The gas supply pipe (6) is connected to the airbag sealing assembly (3), and one end of the gas supply pipe (6) passes through the fixed tube (2) and is connected to the argon gas supply equipment of the automatic argon arc welding machine (1). The outer wall of the movable ring (33) is provided with a plurality of support members (4) at equal intervals in a ring. The support member (4) includes two rotating columns (41) that are rotatably connected to the movable ring (33). A folding arm (42) is fixedly connected to the rotating column (41). A connecting seat (43) is connected between the two folding arms (42). A support wheel (44) is fixedly installed on the connecting seat (43). A drive mechanism (8) is provided inside the fixed tube (2). The drive mechanism (8) includes a connecting shaft (81). Multiple drive arms (82) are connected to the connecting shaft (81) via transmission. The connecting shaft (81) is axially rotatably connected to the fixed tube (2). One end of the connecting shaft (81) passes through the fixed tube (2) and is fixedly connected to a handwheel (83). Two worm gears (84) are fixedly connected to the outer wall of the connecting shaft (81). Multiple worm wheels (85) are meshed on the worm gears (84). A fixed seat is rotatably connected to one side of the worm wheel (85). The fixed seat is fixedly connected to the inner wall of the fixed tube (2). The other side of the worm wheel (85) is connected and fixed to the drive arm (82). A drive block (86) is hinged to one end of the drive arm (82). The drive block (86) is used to drive the support (4) to extend radially.

2. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, The gas pipeline (6) is fixedly connected to two branch pipes (7), and the branch pipes (7) are fixedly connected through the fixed pipe (2) and the sleeve (31).

3. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, Multiple guide strips are fixedly arranged in a ring at equal intervals on the outer wall of the sleeve (31), and the movable ring (33) has a matching guide groove at the position of the guide strip.

4. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, The airbag sleeve (34) has an elliptical structure, and the diameter formed by the cooperation of multiple support wheels (44) is greater than the maximum diameter of the airbag sleeve (34).

5. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, The drive block (86) is located between two rotating columns (41). A drive rod (87) is fixedly connected to the side of the drive block (86) facing the rotating column (41). An arc groove (45) is provided on the outer wall of the rotating column (41). The drive rod (87) is slidably located in the arc groove (45).

6. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, The drive block (86) has a groove at its end that is adapted to the rotating column (41).

7. The fully automatic stainless steel pipe argon arc welding equipment according to claim 1, characterized in that, A flow guide block (5) with an arc-shaped structure is slidably disposed inside the vent hole (35). The cross section of the flow guide block (5) is a right-angled trapezoidal structure. The inclined surface of the flow guide block (5) is disposed on the side away from the fixed pipe (2). The flow guide block (5) and the movable ring (33) are fixedly connected by an elastic element.

Images