Internal fixing and auxiliary clamping reservoir pressure steel pipe welding device

Abstract

The invention discloses an internal fixing auxiliary clamping reservoir pressure steel pipe welding device, and belongs to the technical field of pressure steel pipe welding, the internal fixing auxiliary clamping reservoir pressure steel pipe welding device comprises a rotating pipe, a welding frame, a jacking structure and a pneumatic driving structure, a welding gun is mounted on the lower surface of the upper end of the welding frame, and supporting wheels are distributed on the inner side of the lower end of the welding frame at equal angles; the outer side of a pressure steel pipe is supported through a welding frame and supporting wheels on the welding frame, the two sides of a rotating pipe movably stretch into one ends of limiting rods, the other end of each limiting rod is coaxially connected with a screw, the two screws are provided with supporting structures, the inner side of the pressure steel pipe is supported through the supporting structures, and the pressure steel pipe can be fixed through the supporting structures. The outer side of the rotating pipe is connected with a sleeve through a bearing, a pneumatic driving structure is arranged on the sleeve, and the two ends of the outer side of the sleeve are further connected through a handle rod. According to the pressure steel pipe butt joint device, clamping and fixing can be conducted from the interior of a pressure steel pipe, two to-be-welded pressure steel pipes can be precisely in butt joint, and the welding quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of pressure steel pipe welding equipment, in particular to a reservoir pressure steel pipe welding device with internal fixing and auxiliary clamping. Background Art

[0002] Penstocks are widely used in water conservancy and hydropower, petrochemical industry, municipal water supply and drainage, etc. They are mainly used to transport fluid media. For example, in reservoir projects, welding is the key connection process in the manufacture and installation of penstocks.

[0003] During the welding process, the pressure steel pipe needs to be clamped to ensure stable welding;

[0004] The existing pressure steel pipe welding device still has the following technical problems when in use, such as:

[0005] 1. When the existing pressure steel pipe welding device is used, the pressure steel pipe is generally fixed by an external clamping method. However, clamping and fixing the pressure steel pipe by an external clamping method is likely to cause obstacles to welding. This is because when the pressure steel pipe is clamped by the external clamping method, the clamping structure is close to the welding position. During the welding process, the clamping structure is likely to hinder the use of the welding structure, thereby easily affecting the welding process;

[0006] 2. The existing penstock welding device is not conducive to the stable and accurate docking of the two penstocks to be welded when in use, and thus cannot ensure the accurate connection of the two penstocks after welding;

[0007] Therefore, a reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping is needed to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping to solve the problem mentioned in the above background technology that the existing pressure steel pipe welding device cannot clamp and fix the pressure steel pipe from the inside and cannot ensure the welding accuracy.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A reservoir pressure steel pipe welding device with internal fixing and auxiliary clamping comprises a rotating pipe, a welding frame, a supporting structure and a pneumatic drive structure. A welding gun is installed on the lower surface of the upper end of the welding frame, and support wheels are distributed at equal angles on the inner side of the lower end of the welding frame. The outer side of the pressure steel pipe is supported by the welding frame and the supporting wheels thereon. Both sides of the rotating pipe are movably extended into one end of a limit rod, and the other end of each limit rod is coaxially connected with a screw rod. The two screw rods are provided with a supporting structure, and the inner side of the pressure steel pipe is supported by the supporting structure. The outer side bearing of the rotating pipe is connected to a sleeve, and the sleeve is provided with a pneumatic drive structure. The two ends of the outer side of the sleeve are also connected to the sleeve. The handle is connected, the lower end of the sleeve is fixedly connected to a support frame, and the middle and upper part of the support frame is fixedly connected to a support plate, the support frame is provided with a caster assembly, and the caster assembly is connected to the servo motor through a belt transmission group, and the servo motor is operated to drive the caster assembly to rotate, so that after the welding is completed, the caster assembly is rotated to move the welding device to the outside of the pressure steel pipe, so as to achieve the purpose of recovering the fixed auxiliary clamping component in the welding device, the belt transmission group is also connected to the pneumatic drive structure, and the lower surface of the support plate is provided with a battery pack and a control assembly, the servo motor is powered by the battery pack, and the servo motor is controlled to open and close by the control assembly.

[0011] Preferably, the inner side of the rotating tube and the end of the limiting rod extending into the inner side of the rotating tube are mutually matching prismatic structures, and the two limiting rods are colinear with the axis of the rotating tube.

[0012] Preferably, two groups of caster assemblies are provided, and each group of caster assemblies is composed of a shaft and two casters, and the two shafts and the servo motor are connected through a belt transmission group with a triangular structure.

[0013] Preferably, the top support structure includes a threaded sleeve, a top support rod and a top support block, the threaded sleeve is threadedly connected to the outside of the screw, and two threaded sleeves are arranged on each screw, and the inner sides of the two threaded sleeves on the same screw have opposite thread rotation directions, the outer side of each threaded sleeve is axially connected to one end of two top support rods at equal angles, and the other end of the top support rod is axially connected to the top support block.

[0014] Preferably, the minimum distance between the two threaded sleeves on the same screw is greater than the distance between the other ends of the two support rods connected to the support block, so that when the two threaded sleeves on the same screw are close to each other, the two support blocks are away from each other, thereby facilitating the clamping and fixing of the inner side of the pressure steel pipe.

[0015] Preferably, rubber pads are provided on the back sides of the two supporting blocks to increase the friction when the supporting blocks contact the inner side of the pressure steel pipe, thereby improving the stability of clamping.

[0016] Preferably, the pneumatic drive structure includes a piston tube, a support cover, a limit strip, a twisted thread protrusion, an annular frame, a spring, an extrusion block, an air pipe, a piston plate, a connecting rod, a limit groove and a threaded tube. The limit strips are distributed at equal angles at one end of the inner side of the sleeve, and the limit strips are slidably connected to the corresponding limit grooves. The limit grooves are arranged at equal angles on the outer side of the threaded tube, and the end of the threaded tube away from the limit strip is fixedly connected to the annular frame. The annular frame movably passes through the sleeve, and one end of the connecting rod is distributed at equal angles on the part of the annular frame on the outer side of the sleeve. The other end of the connecting rod is fixedly connected to the side of the piston plate, and the piston plate slides seamlessly. The piston tube is fixedly connected to the outer side of the sleeve, and one end of the air pipe is connected to the piston tube, and the other end of the air pipe passes through the support cover. The support cover is fixedly connected to the upper surface of the support plate, and the front part of the servo motor shaft end is extended into the support cover, and the front outside of the servo motor shaft end is equiangularly distributed with extrusion blocks, and the air pipe is arranged between the extrusion block and the inner side of the support cover, a spring is arranged between the other end of the inner side of the sleeve and the threaded tube, and the inner side of the threaded tube is connected to the twisted thread protrusion by a threaded connection, and the twisted thread protrusion is key-connected to the outer side of the rotating tube.

[0017] Preferably, the sleeve is provided with strip-shaped through grooves distributed at equal angles, and the annular frame penetrates the sleeve through the strip-shaped through grooves.

[0018] Preferably, the annular frame and the piston tube are both arc-shaped, so as to avoid the support frame affecting the arrangement of the annular frame and the piston tube.

[0019] Preferably, the portion of the air delivery pipe disposed inside the support cover is a rubber portion, and the rubber portion of the air delivery pipe is fixedly connected to the support cover.

[0020] Compared with the prior art, the invention has the following beneficial effects: the reservoir pressure steel pipe welding device with internal fixing auxiliary clamping can clamp and fix from the inside of the pressure steel pipe, and can accurately butt the two pressure steel pipes to be welded, thereby ensuring the quality of welding:

[0021] 1. Lift the handle by hand to suspend the structure that clamps and fixes the inside of the pressure steel pipe, and then start the servo motor through the remote control device and control component to rotate its shaft end counterclockwise, so that the extrusion block unidirectionally squeezes the gas pipe, so that the gas pipe transmits gas to the inside of the piston tube, and then the piston plate moves toward the open end of the piston tube, and then the threaded tube is driven to move through the connecting rod and the annular frame, so that the rotating tube can be driven to rotate through the twisted thread protrusion, and then the screw is driven to rotate through the limit rod. During the rotation of the screw, the top support structure will be expanded until the height of the top support block below is low. At the height of the caster assembly, the two supporting structures are respectively extended into the two pressure steel pipes to be welded, and then the shaft end of the servo motor continues to rotate counterclockwise, so that the two supporting structures can be unfolded to clamp the two pressure steel pipes from the inside. When the servo motor rotates its shaft end clockwise, the two supporting structures can be retracted, and the caster assembly can be gradually contacted with the inner wall of the pressure steel pipe. After that, the structure clamping the pressure steel pipe can be moved in the pressure steel pipe through the caster assembly, so that the structure clamping the pressure steel pipe can be easily moved out of the pressure steel pipe;

[0022] 2. After the two pressure steel pipes are clamped, the two pressure steel pipes are moved closer to each other, and the limit rod moves in the rotating tube, so as to ensure that the two pressure steel pipes are accurately docked. In this way, not only the two pressure steel pipes are stably clamped, but also the precise docking of the two pressure steel pipes can improve the welding quality in subsequent welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional connection structure of the screw rod and the sleeve from the left side of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional connection structure of the screw and the sleeve from the right side of the present invention;

[0025] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of point A;

[0026] Figure 4 For the present invention Figure 1 Schematic diagram of the longitudinal section structure;

[0027] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of point B in the middle;

[0028] Figure 6 It is a partial cross-sectional structural schematic diagram of the present invention;

[0029] Figure 7 For the present invention Figure 7 The schematic diagram of the enlarged structure of point C in the middle;

[0030] Figure 8 This is a schematic diagram of the position structure of the rotating tube and the piston tube of the present invention;

[0031] Fig. 9 This is a schematic diagram of the position structure of the rotating tube and the welding frame of the present invention.

[0032] In the figure: 1. rotating tube; 2. screw; 3. threaded sleeve; 4. support rod; 5. support block; 6. sleeve; 7. handle; 8. support frame; 9. caster assembly; 10. limit rod; 11. piston tube; 12. belt drive group; 13. support plate; 14. support cover; 15. limit strip; 16. twisted thread protrusion; 17. ring frame; 18. spring; 19. servo motor; 20. extrusion block; 21. air supply pipe; 22. piston plate; 23. connecting rod; 24. limit groove; 25. threaded tube; 26. welding gun; 27. welding frame; 28. support wheel. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 9 , the present invention provides the following technical solutions:

[0035] Embodiment 1:

[0036] In order to solve the problem that the pressure steel pipe welding device is not convenient for welding steel pipes when welding pressure steel pipes, the following technical solutions are provided, specifically,

[0037] A reservoir pressure steel pipe welding device with internal fixing auxiliary clamping includes a rotating pipe 1, a welding frame 27, a support top structure and a pneumatic drive structure. A welding gun 26 is installed on the lower surface of the upper end of the welding frame 27, and support wheels 28 are distributed at equal angles on the inner side of the lower end of the welding frame 27. The outer side of the pressure steel pipe is supported by the welding frame 27 and the support wheels 28 thereon. Both sides of the rotating pipe 1 are movably extended into one end of a limit rod 10, and the other end of each limit rod 10 is coaxially connected to a screw rod 2, and the two screw rods 2 are provided with a support top structure. The structure supports the inner side of the pressure steel pipe through the top support structure. The inner side of the rotating tube 1 and the end of the limit rod 10 extending into the inner side of the rotating tube 1 are mutually matched prismatic structures, and the two limit rods 10 are colinear with the axis of the rotating tube 1. There are two groups of caster assemblies 9, and each group of caster assemblies 9 is composed of a shaft and two casters. The two shafts and the servo motor 19 are connected by a belt drive group 12 with a triangular structure. The top support structure includes a threaded sleeve 3, a top support rod 4 and a top support block 5. The threaded sleeve 3 is threadedly connected to the outer side of the screw 2. , and each screw rod 2 is provided with two threaded sleeves 3, and the inner threads of the two threaded sleeves 3 on the same screw rod 2 are in opposite directions, and the outer side of each threaded sleeve 3 is equiangularly axially connected to one end of two support rods 4, and the other end of the support rod 4 is axially connected to the support block 5, and the two threads on it are rotated by the screw rod 2 (because the structural mass composed of the threaded sleeve 3, the support rod 4 and the support block 5 is larger than that of the screw rod 2, so when the screw rod 2 rotates, the structure composed of the threaded sleeve 3, the support rod 4 and the support block 5 will not rotate with it), so that The sleeves 3 are close to or away from each other. When the two threaded sleeves 3 are close to each other, the two support blocks 5 will move away from each other, thereby achieving the effect of clamping and fixing the pressure steel pipe. When the two threaded sleeves 3 move away from each other, the two support blocks 5 will be close to each other, so that the pressure steel pipe is no longer clamped and fixed. In addition, through the limiting movable connection between the limiting rod 10 and the rotating tube 1, the two pressure steel pipes can be close to each other and docked while being stably clamped, thereby improving the accuracy of docking and helping to improve the quality of subsequent welding.

[0038] Embodiment 2:

[0039] In order to solve the problem that the pressure steel pipe welding device in the past was not convenient for stably clamping the pressure steel pipe from the inside, the following technical solution is provided. Specifically, the outer bearing of the rotating tube 1 is connected with a sleeve 6, and a pneumatic drive structure is arranged on the sleeve 6. The two ends of the outer side of the sleeve 6 are also connected by a handle 7. The lower end of the sleeve 6 is fixedly connected with a support frame 8, and the middle and upper part of the support frame 8 is fixedly connected with a support plate 13. A caster assembly 9 is arranged on the support frame 8, and the caster assembly 9 is connected to the servo motor 19 through a belt drive group 12. The servo motor 19 is operated to drive the caster assembly 9 to rotate, so that after the welding is completed, the caster assembly 9 is rotated to move the welding device to the outside of the pressure steel pipe, so as to achieve the purpose of recovering the fixed auxiliary clamping member in the welding device. The belt drive group 12 is also connected to the pneumatic drive structure. The lower surface of the support plate 13 is provided with a battery pack and a control assembly. The servo motor 19 is powered by the battery pack, and the servo motor 19 is controlled to open and close by the control assembly.

[0040] The minimum distance between the two threaded sleeves 3 on the same screw rod 2 is greater than the distance between the other ends of the two support rods 4 connected to the support block 5, so that when the two threaded sleeves 3 on the same screw rod 2 are close to each other, the two support blocks 5 are away from each other, thereby facilitating the clamping and fixing of the inner side of the pressure steel pipe. Rubber pads are provided on the back sides of the two support blocks 5 to increase the friction when the support blocks 5 contact the inner side of the pressure steel pipe, thereby improving the clamping stability. The pneumatic drive structure includes a piston tube 11, a support cover 14, a limit strip 15, a twisted thread protrusion 16, an annular frame 17, a spring 18, an extrusion block 20, an air supply pipe 21, a piston plate 22, a connecting rod 23, a limit groove 24 and a threaded tube 25, and one end of the inner side of the sleeve 6 is angularly spaced. A limit strip 15 is distributed, and the limit strip 15 is slidably connected to the corresponding limit groove 24. The limit groove 24 is set at an equal angle on the outside of the threaded tube 25, and the end of the threaded tube 25 away from the limit strip 15 is fixedly connected with an annular frame 17, the annular frame 17 is movably arranged to penetrate the sleeve 6, and one end of the connecting rod 23 is distributed at an equal angle on the part of the annular frame 17 outside the sleeve 6, the other end of the connecting rod 23 is fixedly connected to the side of the piston plate 22, and the piston plate 22 is seamlessly slidably connected to the open end of the piston tube 11, the piston tube 11 is fixedly connected to the outside of the sleeve 6, and one end of the air supply pipe 21 is connected through the piston tube 11, and the other end of the air supply pipe 21 is set to penetrate the support cover 14, and the support cover 14 is fixedly connected to the support plate 13 The upper surface of the support cover 14 is provided with a front part of the shaft end of the servo motor 19, and the front outer side of the shaft end of the servo motor 19 is equiangularly distributed with extrusion blocks 20, and the air pipe 21 is arranged between the extrusion block 20 and the inner side of the support cover 14. After the servo motor 19 is started, its shaft end will drive the extrusion block 20 to rotate. Through the rotation of the extrusion block 20, the air pipe 21 can be continuously squeezed to generate negative pressure in the air pipe 21, so that the air pipe 21 can transport gas. The gas delivery direction of the air pipe 21 can be changed by the forward and reverse operation of the servo motor 19. When the air pipe 21 transports gas into the piston tube 11, the threaded tube 25 can drive the twisted thread protrusion 16 to rotate forwardly, and when the air pipe 21 extracts gas from the piston tube 11, the threaded tube 25 can drive the twisted thread protrusion 16 to rotate forwardly. When the body is rotated, the threaded tube 25 drives the twisted thread protrusion 16 to rotate in the opposite direction, so that the pressure steel pipe can be clamped and fixed from the inside. A spring 18 is arranged between the other end of the inner side of the sleeve 6 and the threaded tube 25, and the inner side of the threaded tube 25 is connected to the twisted thread protrusion 16 by a threaded connection, and the twisted thread protrusion 16 is key-connected to the outer side of the rotating tube 1. Strip through grooves are distributed at equal angles on the sleeve 6, and the annular frame 17 penetrates the sleeve 6 through the strip through grooves. The annular frame 17 and the piston tube 11 are both arc-shaped, so as to avoid the support frame 8 from affecting the setting of the annular frame 17 and the piston tube 11. The part of the air supply pipe 21 arranged inside the support cover 14 is a rubber part, and the rubber part of the air supply pipe 21 is fixedly connected to the support cover 14.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reservoir pressure steel pipe welding device with internal fixing auxiliary clamping, comprising a rotating pipe (1), a welding frame (27), a top support structure and a pneumatic drive structure, characterized in that: A welding gun (26) is installed on the lower surface of the upper end of the welding frame (27), and support wheels (28) are distributed at equal angles on the inner side of the lower end of the welding frame (27). The outer side of the pressure steel pipe is supported by the welding frame (27) and the support wheels (28) thereon. Both sides of the rotating tube (1) are movably extended into one end of the limit rod (10), and the other end of each limit rod (10) is coaxially connected to a screw rod (2). The two screw rods (2) are provided with a supporting structure. The inner side of the pressure steel pipe is supported by the supporting structure. The outer side bearing of the rotating tube (1) is connected to a sleeve (6), and the sleeve (6) is provided with a pneumatic drive structure. The two ends of the outer side of the sleeve (6) are also connected by a handle (7). The lower end of the sleeve (6) is fixedly connected to a supporting structure. The support frame (8) is provided with a support plate (13) fixedly connected to the middle and upper part of the support frame (8); a caster assembly (9) is provided on the support frame (8); the caster assembly (9) is connected to a servo motor (19) via a belt transmission group (12); the belt transmission group (12) drives the caster assembly (9) to rotate when the servo motor (19) is running, so that after welding is completed, the caster assembly (9) is rotated to move the welding device to the outside of the pressure steel pipe, so as to achieve the purpose of recovering the fixed auxiliary clamping member in the welding device; the belt transmission group (12) is also connected to a pneumatic drive structure; a battery pack and a control assembly are provided on the lower surface of the support plate (13); the servo motor (19) is powered by the battery pack; and the servo motor (19) is controlled to open and close by the control assembly.

2. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 1 is characterized in that: The inner side of the rotating tube (1) and the end of the limiting rod (10) extending into the interior thereof are mutually matching prismatic structures, and the two limiting rods (10) are colinear with the axis of the rotating tube (1).

3. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 2 is characterized in that: The caster assemblies (9) are provided in two groups, and each group of caster assemblies is composed of a shaft and two casters, and the two shafts and the servo motor (19) are connected via a belt transmission group (12) with a triangular structure.

4. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 3 is characterized in that: The support structure comprises a threaded sleeve (3), a support rod (4) and a support block (5); the threaded sleeve (3) is threadedly connected to the outside of the screw rod (2); two threaded sleeves (3) are provided on each screw rod (2); the threads on the inside of the two threaded sleeves (3) on the same screw rod (2) have opposite rotation directions; the outside of each threaded sleeve (3) is axially connected to one end of two support rods (4) at equal angles; and the other end of the support rod (4) is axially connected to the support block (5).

5. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 4 is characterized in that: The minimum distance between the two threaded sleeves (3) on the same screw rod (2) is greater than the distance between the other ends of the two support rods (4) connected to the support block (5), so that when the two threaded sleeves (3) on the same screw rod (2) are close to each other, the two support blocks (5) are separated from each other, thereby facilitating the clamping and fixing of the inner side of the pressure steel pipe.

6. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 5 is characterized in that: The two supporting blocks (5) are both provided with rubber pads on their back sides to increase the friction between the supporting blocks (5) and the inner side of the pressure steel pipe when in contact, thereby improving the stability of the clamping.

7. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 6 is characterized by: The pneumatic drive structure comprises a piston tube (11), a support cover (14), a limit strip (15), a twisted thread protrusion (16), an annular frame (17), a spring (18), an extrusion block (20), an air delivery pipe (21), a piston plate (22), a connecting rod (23), a limit groove (24) and a threaded tube (25); the limit strip (15) is distributed at an equal angle on one end of the inner side of the sleeve (6), and the limit strip (15) is slidably connected to the corresponding limit groove (24); the limit groove (24) is arranged at an equal angle on the outer side of the threaded tube (25), and the end of the threaded tube (25) away from the limit strip (15) is fixedly connected to the annular frame (17); the annular frame (17) is movably arranged to penetrate the sleeve (6), and one end of the connecting rod (23) is distributed at an equal angle on the part of the annular frame (17) outside the sleeve (6); the other end of the connecting rod (23) is fixedly connected to the side of the piston plate (22); The piston plate (22) is seamlessly slidably connected to the open end of the piston tube (11); the piston tube (11) is fixedly connected to the outer side of the sleeve (6); one end of the air supply pipe (21) is connected through the piston tube (11); the other end of the air supply pipe (21) is arranged through the support cover (14); the support cover (14) is fixedly connected to the upper surface of the support plate (13); the front part of the shaft end of the servo motor (19) is extended into the support cover (14); the front part of the shaft end of the servo motor (19) is equiangularly distributed on the outer side of the front part, and the air supply pipe (21) is arranged between the extrusion block (20) and the inner side of the support cover (14); a spring (18) is arranged between the other end of the inner side of the sleeve (6) and the threaded tube (25); the inner side of the threaded tube (25) is connected to the twisted thread protrusion (16) by a threaded connection method; and the twisted thread protrusion (16) is key-connected to the outer side of the rotating tube (1).

8. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 7 is characterized in that: The sleeve (6) is provided with strip-shaped through grooves distributed at equal angles, and the annular frame (17) penetrates the sleeve (6) through the strip-shaped through grooves.

9. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 8 is characterized in that: The annular frame (17) and the piston tube (11) are both arc-shaped, so as to avoid the support frame (8) affecting the arrangement of the annular frame (17) and the piston tube (11).

10. The reservoir pressure steel pipe welding device with internal fixation and auxiliary clamping according to claim 9, characterized in that: The portion of the air delivery pipe (21) disposed inside the support cover (14) is a rubber portion, and the rubber portion of the air delivery pipe (21) is fixedly connected to the support cover (14).

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