Synchronous adjusting and supporting device for internal welding and external welding of spiral welding pipe

Abstract

The invention relates to the technical field of welding clamps, in particular to a spiral welded pipe inner welding and outer welding synchronous adjusting and supporting device which comprises a base, a forming device used for conveying a spiral pipe blank is fixedly installed on the outer wall of the base, and a first support is arranged on the outer wall of the side, close to a discharging port of the forming device, of the base. According to the spiral pipe blank welding device, the floating frame is arranged, the abutting wheel arranged on the floating frame elastically supports a welded pipe body, under the action of friction force between the abutting wheel and a spiral pipe blank, the spiral pipe blank is subjected to axial counter-acting force from the floating frame, and then a pipe body joint of the spiral pipe blank is closed; and when the detection value of the pressure sensor reaches a threshold value, the floating frame slides and resets, so that the abutting wheel is driven to roll the outer wall of the spiral pipe blank, the process is repeated, and through reciprocating sliding of the floating frame, the pipe body is dynamically restrained, the welded pipe body part is continuously rounded, and the situation that the area of the pipe body is deformed after welding is avoided.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and in particular to a synchronous adjustment support device for internal and external welding of spiral welded pipes. Background Technology

[0002] Spiral welded pipes, with their advantages of high raw material utilization, high production efficiency, and adaptability to large-diameter transportation needs, are widely used in various fields such as oil and natural gas transportation, water supply and drainage projects, and building structures. The welding quality directly determines the pipe's load-bearing capacity, sealing performance, and service life. In the production process of spiral welded pipes, simultaneous internal and external welding is the core process to ensure weld formation quality and improve production efficiency. As a key auxiliary component in the welding process, the support device must provide stable support for the pipe body to ensure accurate pipe axis and good weld alignment during welding.

[0003] Currently, most existing spiral welded pipe welding support devices adopt a rigid structure design, which can only achieve fixed support for pipes of a single size. They lack flexible adjustment capabilities and thermal expansion adaptability. During the welding process, the local temperature of the pipe rises sharply, causing a significant thermal expansion effect. During the cooling stage, it will contract, forming an uneven thermal cycle process, which in turn generates welding residual stress. However, the rigid constraints of existing support devices will force the pipe to be limited, resulting in additional stress on the pipe, which can easily lead to defects such as pipe deformation and weld cracking. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing a synchronous adjustment and support device for inner and outer welding of spiral welded pipes. This invention utilizes a floating frame, on which abutment wheels provide elastic support to the welded pipe body. Under the frictional force between the abutment wheels and the spiral pipe blank, the spiral pipe blank experiences an axial reaction force from the floating frame, thereby causing the pipe body joint to close. When the pressure sensor's detection value reaches a threshold, the floating frame slides back to its original position, causing the abutment wheels to roll against the outer wall of the spiral pipe blank. This process repeats, with the floating frame sliding back and forth, achieving dynamic constraint on the pipe body and continuously rounding the welded pipe section, preventing deformation in the welded area.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a synchronous adjustment support device for inner and outer welding of spiral welded pipe, comprising a base, a forming device for conveying spiral pipe blanks fixedly installed on the outer wall of the base, a first support provided on the outer wall of the base near the discharge port of the forming device, an outer welding assembly provided on the outer wall of the first support, a floating frame slidably connected to the outer wall of the first support, a pressure sensor fixedly installed on the outer wall of the floating frame, a boss slidably connected to the outer wall of the floating frame in contact with the sensing surface of the pressure sensor, and a plurality of equidistantly distributed circumferentially arranged members fixedly installed on the floating frame. The motor has a mounting sleeve fixedly installed on its main shaft. A limit groove is opened in the mounting sleeve, and a limit block is slidably inserted into the limit groove. An abutment wheel is fixedly installed on the outer wall of the limit block. A first constraint spring is set between the outer wall of the limit block and the inner wall of the limit groove. A control unit is set on the outer wall of the first bracket. The motor and the pressure sensor are electrically connected through the control unit. A second bracket is set on the outer wall of the base near the feed port of the forming device. An inner welding component is set on the outer wall of the second bracket. An outer wall alignment component is set on the first bracket, and an inner wall alignment component is set on the second bracket.

[0006] Preferably, an electric reciprocating push rod is fixed on the outer wall of the first bracket, and the output end of the electric reciprocating push rod is fixed on the outer wall of the boss.

[0007] Preferably, a fixed sleeve is fixedly installed on the outer wall of the first bracket, and a sliding sleeve is fixedly installed on the outer wall of the floating frame, with the sliding sleeve slidably mounted on the outer wall of the fixed sleeve.

[0008] Preferably, a nozzle is fixedly installed on the top outer wall of the floating frame, and an airbag communicating with the nozzle is fixed on the inner wall of the sliding sleeve. The two ends of the airbag are fixed on the inner walls of the sliding sleeve and the fixed sleeve, respectively. A one-way valve communicating with the airbag is fixed on the outer wall of the fixed sleeve.

[0009] Preferably, the outer wall alignment component includes several equidistantly distributed outer positioning frames. Several sets of first hydraulic rods are fixedly installed on the outer wall of the first support. The output end of the first hydraulic rod is fixed on the outer wall of the outer positioning frame. Several first rollers are rotatably connected to the outer wall of the outer positioning frame via a rotating shaft.

[0010] Preferably, a sleeve is provided on the outer wall of the outer positioning frame near the outer welding component, and a second constraint spring is installed on the inner wall of the sleeve, wherein the shaft of the first roller near the outer welding component is slidably inserted into the sleeve.

[0011] Preferably, the inner wall alignment component includes several equidistantly distributed inner positioning frames, several sets of second hydraulic rods are fixedly installed on the outer wall of the second bracket, the output end of the second hydraulic rod is fixed on the outer wall of the inner positioning frame, and several second rollers are rotatably connected to the outer wall of the inner positioning frame.

[0012] Preferably, the second support penetrates the inner cavity of the forming device and extends to the side where the first support is located, and the inner positioning frame and the inner welding assembly are both located inside the spiral tube blank.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes a floating frame to provide elastic support to the welded tube body via abutment wheels on the floating frame. Under the frictional force between the abutment wheels and the spiral tube blank, the spiral tube blank experiences an axial reaction force from the floating frame, thereby causing the tube body joint of the spiral tube blank to close. When the detection value of the pressure sensor reaches the threshold, the floating frame slides back to its original position, thereby driving the abutment wheels to roll against the outer wall of the spiral tube blank. This process is repeated, and the reciprocating sliding of the floating frame achieves dynamic constraint on the tube body, continuously rounding the welded tube body and preventing deformation of the welded area.

[0014] 2. The present invention uses an air bladder to allow the floating frame to slide away from the forming device when the spiral tube blank pushes the floating frame to slide relative to the fixed sleeve. The air bladder is an axially corrugated tube body that can only expand and contract axially, thereby stretching the air bladder between the sliding sleeve and the fixed sleeve. At this time, outside air enters the air bladder through a one-way valve. When the floating frame returns to its original position, the air bladder is compressed, allowing the air inside the air bladder to be blown onto the welded tube body through a nozzle. This process is repeated to achieve intermittent cooling, reduce the tendency of thermal expansion and deformation, and avoid the decrease in tube toughness caused by continuous cooling.

[0015] 3. The present invention, through the setting of an outer positioning frame and an inner positioning frame, enables the outer positioning frame and the inner positioning frame to abut against the outer wall and the inner wall of the spiral tube blank respectively through the first hydraulic rod and the second hydraulic rod. This allows the device to adapt to tubes of different diameters and wall thicknesses, further improving the practicality of the device. At the same time, the first roller and the second roller are arranged along the axial direction of the spiral tube blank, so that the tube walls on both sides of the weld can be pressed and aligned, avoiding misalignment of the weld. Furthermore, the first roller on the side closer to the outer welding component is elastically constrained. When the tube expands due to welding heat, the first roller on this side compresses the second constraint spring to retract, allowing the tube to release stress and preventing the outer positioning frame from locking the tube after expansion, thus avoiding material jamming. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure proposed in this invention; Figure 2 This is a three-dimensional schematic diagram of the floating frame proposed in this invention; Figure 3 This is a three-dimensional cross-sectional view of the sliding sleeve proposed in this invention; Figure 4 This is a three-dimensional sectional view of the mounting sleeve proposed in this invention; Figure 5 This is a three-dimensional sectional view of the overall structure proposed in this invention. Figure 1 ; Figure 6 This is a three-dimensional sectional view of the overall structure proposed in this invention. Figure 2 ; Figure 7 This is a three-dimensional sectional view of the external positioning frame proposed in this invention; Figure 8 This is a three-dimensional schematic diagram of the internal positioning frame proposed in this invention.

[0017] Legend: 1. Base; 11. Forming device; 12. First support; 121. Outer welding assembly; 13. Second support; 131. Inner welding assembly; 14. Control unit; 2. Floating frame; 21. Pressure sensor; 211. Electric reciprocating push rod; 212. Boss; 22. Motor; 221. Mounting sleeve; 222. Limiting groove; 223. Limiting block; 224. Abutting wheel; 225. First constraint spring; 23. Nozzle; 24. Sliding sleeve; 241. Airbag; 242. Fixing sleeve; 243. One-way valve; 3. Outer positioning frame; 31. First hydraulic rod; 32. First roller; 321. Second constraint spring; 33. Sleeve; 4. Inner positioning frame; 41. Second hydraulic rod; 42. Second roller; 9. Spiral tube blank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] See Figures 1 to 8As shown, a synchronous adjustment support device for inner and outer welding of spiral welded pipe includes a base 1. A forming device 11 for conveying spiral pipe blank 9 is fixedly installed on the outer wall of the base 1. A first support 12 is provided on the outer wall of the base 1 near the discharge port of the forming device 11. An outer welding assembly 121 is provided on the outer wall of the first support 12. A floating frame 2 is slidably connected to the outer wall of the first support 12. A pressure sensor 21 is fixedly installed on the outer wall of the floating frame 2. A boss 212 that contacts the sensing surface of the pressure sensor 21 is slidably connected to the outer wall of the floating frame 2. Several motors 22 are equidistantly distributed circumferentially on the floating frame 2. An mounting sleeve 221 is fixedly installed on the main shaft of the motor 22. A limit groove 222 is formed in the mounting sleeve 221. 2. A sliding insertion limit block 223 is provided. An abutment wheel 224 is fixedly installed on the outer wall of the limit block 223. A first constraint spring 225 is provided between the outer wall of the limit block 223 and the inner wall of the limit groove 222. A control unit 14 is provided on the outer wall of the first bracket 12. The motor 22 and the pressure sensor 21 are electrically connected through the control unit 14. A second bracket 13 is provided on the outer wall of the base 1 near the feed port of the forming device 11. An inner welding assembly 131 is provided on the outer wall of the second bracket 13. An outer wall alignment assembly is provided on the first bracket 12. An inner wall alignment assembly is provided on the second bracket 13. An electric reciprocating push rod 211 is fixed on the outer wall of the first bracket 12. The output end of the electric reciprocating push rod 211 is fixed on the outer wall of the boss 212.

[0020] It should be noted that the first constraint spring 225 enables the abutment wheel 224 to provide elastic support for the spiral tube blank 9.

[0021] The steel strip is rolled into a spiral tube blank 9 by the forming device 11, and the spiral tube blank 9 is rotated and delivered to the first support 12 according to the preset spiral angle. The forming device 11 is a mature existing technology and will not be described in detail here.

[0022] After the spiral tube blank 9 is discharged from the outlet of the forming device 11, the tube body joint is welded by the outer welding assembly 121 and the inner welding assembly 131. The welded tube body enters the floating frame 2. The abutment wheel 224 set on the floating frame 2 provides elastic support for the welded tube body. When the tube body expands thermally, the tube body pushes the abutment wheel 224 to compress the first constraint spring 225 and retract, so that the tube body can expand freely after welding, release stress, and avoid the generation of constraint stress and cracks.

[0023] In the initial state, the electric reciprocating push rod 211 retracts, and the rotation axis of the abutment wheel 224 is parallel to the axis of the spiral tube blank 9. When the spiral tube blank 9 contacts the abutment wheel 224, the spiral tube blank 9 is subjected to the axial reaction force from the floating frame 2, which in turn causes the tube body joint of the spiral tube blank 9 to close, avoiding the situation where the joint is too large due to the springback of the tube body after forming, ensuring the welding effect, and helping to improve the yield.

[0024] Simultaneously, the boss 212 presses against the sensing surface of the pressure sensor 21, causing the detection value of the pressure sensor 21 to rise. When the detection value of the pressure sensor 21 reaches the threshold, the control unit 14 controls the main shaft of the motor 22 to rotate at a certain angle. The rotation angle is determined according to the helical helix angle of the tube body, so that the axis of the abutment wheel 224 rotates to a state perpendicular to the tangent of the helical joint of the spiral tube blank 9, changing the force state between the spiral tube blank 9 and the abutment wheel 224 at this time. This allows the abutment wheel 224 to roll along the outer wall of the spiral tube blank 9. At the same time, the electric reciprocating push rod 211 extends, driving the floating frame 2 to slide and reset, thereby driving the abutment wheel 224 to roll against the outer wall of the spiral tube blank 9. This process is repeated, and the floating frame 2 slides back and forth to achieve dynamic constraint on the tube body, continuously rounding the welded tube body and preventing deformation of the welded area of ​​the tube body.

[0025] A fixed sleeve 242 is fixedly installed on the outer wall of the first support 12, and a sliding sleeve 24 is fixedly installed on the outer wall of the floating frame 2. The sliding sleeve 24 is slidably sleeved on the outer wall of the fixed sleeve 242. A nozzle 23 is fixedly installed on the top outer wall of the floating frame 2. An airbag 241 communicating with the nozzle 23 is fixed on the inner wall of the sliding sleeve 24. The two ends of the airbag 241 are fixed on the inner walls of the sliding sleeve 24 and the fixed sleeve 242, respectively. A one-way valve 243 communicating with the airbag 241 is fixed on the outer wall of the fixed sleeve 242.

[0026] It should be noted that when the spiral tube blank 9 pushes the floating frame 2 to slide away from the forming device 11, the floating frame 2 drives the sliding sleeve 24 to slide relative to the fixed sleeve 242. The air bladder 241 is an axially corrugated tube bladder, which can only expand and contract along the axial direction. This causes the air bladder 241 between the sliding sleeve 24 and the fixed sleeve 242 to be stretched. At this time, outside air enters the air bladder 241 through the one-way valve 243. When the floating frame 2 returns to its original position, the air bladder 241 is compressed, which causes the air in the air bladder 241 to be blown towards the welded tube body through the nozzle 23. This process is repeated to achieve intermittent cooling, reduce the tendency of thermal expansion and deformation, and avoid the situation where continuous cooling leads to a decrease in the toughness of the tube body.

[0027] The outer wall alignment component includes several equidistantly distributed outer positioning frames 3. Several sets of first hydraulic rods 31 are fixedly installed on the outer wall of the first support 12. The output ends of the first hydraulic rods 31 are fixed to the outer wall of the outer positioning frames 3. Several first rollers 32 are rotatably connected to the outer wall of the outer positioning frames 3 via a rotating shaft. A sleeve 33 is provided on the outer wall of the outer positioning frame 3 near the outer welding assembly 121. A second constraint spring 321 is installed on the inner wall of the sleeve 33. The first rollers 32 near the outer welding assembly 121 are... The rotating shaft is slidably inserted into the sleeve 33. The inner wall alignment component includes several inner positioning frames 4 distributed equidistantly in a circle. Several sets of second hydraulic rods 41 are fixedly installed on the outer wall of the second support 13. The output end of the second hydraulic rod 41 is fixed on the outer wall of the inner positioning frame 4. Several second rollers 42 are rotatably connected to the outer wall of the inner positioning frame 4. The second support 13 penetrates the inner cavity of the forming device 11 and extends to the side where the first support 12 is located. The inner positioning frame 4 and the inner welding component 131 are both located inside the spiral tube blank 9.

[0028] It should be noted that the first hydraulic rod 31 and the second hydraulic rod 41 drive the outer positioning frame 3 and the inner positioning frame 4 to abut against the outer wall and inner wall of the spiral tube blank 9 respectively, so that the device can be adapted to tubes with different diameters and wall thicknesses, further improving the practicality of the device.

[0029] The first roller 32 on the outer positioning frame 3 and the second roller 42 on the inner positioning frame 4 abut against the outer and inner walls of the pipe body respectively, reducing pipe body wear and progress resistance. At the same time, the first roller 32 and the second roller 42 are arranged along the axial direction of the spiral tube blank 9, so that the pipe walls on both sides of the weld can be pressed and aligned, avoiding weld misalignment.

[0030] Furthermore, the first roller 32 on the side closest to the outer welding assembly 121 is an elastic constraint. When the tube body expands due to welding heat, the first roller 32 on this side compresses the second constraint spring 321 to retract, so that the tube body can release stress. At the same time, it prevents the outer positioning frame 3 from locking the tube body after the tube body expands, which would cause material jamming.

[0031] In addition, by setting the outer positioning frame 3 and the inner positioning frame 4, the outer and inner walls of the tube are supported at the same time, which can prevent the tube from sagging due to its own weight and keep the tube straight during welding. Furthermore, since the forming device 11 drives the spiral tube blank 9 to rotate and move forward, the spiral tube blank 9 rotates relative to the outer positioning frame 3 and the inner positioning frame 4, thereby achieving continuous rounding during the tube's progress and further reducing the possibility of tube deformation.

[0032] Working principle: The steel strip is rolled into a spiral tube blank 9 by the forming device 11, and the spiral tube blank 9 is rotated and delivered to the first support 12 according to the preset spiral helix angle. The forming device 11 is a mature existing technology and will not be described in detail here. The outer and inner walls of the spiral tube blank 9 are simultaneously positioned using the outer and inner wall alignment components. After the spiral tube blank 9 is discharged from the outlet of the forming device 11, the tube joint is welded by the outer welding component 121 and the inner welding component 131. The welded tube part enters the floating frame 2, and the welded tube is elastically supported by the abutment wheel 224 set on the floating frame 2. When the tube expands thermally, the tube pushes the abutment wheel 224 to compress the first constraint spring 225 and retract, so that the tube can expand freely after welding, release stress, and avoid the generation of constraint stress and cracks.

[0033] In the initial state, the electric reciprocating push rod 211 retracts, and the rotation axis of the abutment wheel 224 is parallel to the axis of the spiral tube blank 9. When the spiral tube blank 9 contacts the abutment wheel 224, the spiral tube blank 9 is subjected to the axial reaction force from the floating frame 2, which in turn causes the tube body joint of the spiral tube blank 9 to close, avoiding the situation where the joint is too large due to the springback of the tube body after forming, ensuring the welding effect, and helping to improve the yield.

[0034] Simultaneously, the boss 212 presses against the sensing surface of the pressure sensor 21, causing the detection value of the pressure sensor 21 to rise. When the detection value of the pressure sensor 21 reaches the threshold, the control unit 14 controls the main shaft of the motor 22 to rotate at a certain angle. The rotation angle is determined according to the helical helix angle of the tube body, so that the axis of the abutment wheel 224 rotates to a state perpendicular to the tangent of the helical joint of the spiral tube blank 9, thereby reducing the friction force on the tube body. This allows the abutment wheel 224 to roll along the outer wall of the spiral tube blank 9. At the same time, the electric reciprocating push rod 211 extends, driving the floating frame 2 to slide and reset, thereby driving the abutment wheel 224 to roll against the outer wall of the spiral tube blank 9. This process is repeated, and the floating frame 2 slides back and forth to achieve dynamic constraint on the tube body, continuously rounding the welded tube body and preventing deformation of the welded area of ​​the tube body.

[0035] When the aforementioned spiral tube blank 9 pushes the floating frame 2 to slide away from the forming device 11, the floating frame 2 drives the sliding sleeve 24 to slide relative to the fixed sleeve 242. The air bladder 241 is an axially corrugated tube bladder, which can only expand and contract along the axial direction, thereby stretching the air bladder 241 between the sliding sleeve 24 and the fixed sleeve 242. At this time, outside air enters the air bladder 241 through the one-way valve 243. When the floating frame 2 returns to its original position, the air bladder 241 is compressed, thereby causing the air in the air bladder 241 to be blown towards the welded tube body through the nozzle 23. This process is repeated to achieve intermittent cooling, reduce the tendency of thermal expansion and deformation, and at the same time avoid the situation where continuous cooling leads to a decrease in the toughness of the tube body.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A synchronous adjustment support device for inner and outer welding of spiral welded pipes, comprising a base (1), characterized in that: A forming device (11) for conveying spiral tube blanks (9) is fixedly installed on the outer wall of the base (1). A first bracket (12) is provided on the outer wall of the base (1) near the discharge port of the forming device (11). An outer welding assembly (121) is provided on the outer wall of the first bracket (12). A floating frame (2) is slidably connected to the outer wall of the first bracket (12). A pressure sensor (21) is fixedly installed on the outer wall of the floating frame (2). A boss (212) that contacts the sensing surface of the pressure sensor (21) is slidably connected to the outer wall of the floating frame (2). Several motors (22) are equidistantly distributed in a circle on the floating frame (2). An mounting sleeve (221) is fixedly installed on the main shaft of the motor (22). A limited opening is made inside the mounting sleeve (221). The positioning groove (222) has a limiting block (223) that is slidably inserted into it. An abutment wheel (224) is fixedly installed on the outer wall of the limiting block (223). A first constraint spring (225) is provided between the outer wall of the limiting block (223) and the inner wall of the limiting groove (222). A control unit (14) is provided on the outer wall of the first bracket (12). The motor (22) and the pressure sensor (21) are electrically connected through the control unit (14). A second bracket (13) is provided on the outer wall of the base (1) near the feed port of the molding device (11). An inner welding component (131) is provided on the outer wall of the second bracket (13). An outer wall alignment component is provided on the first bracket (12), and an inner wall alignment component is provided on the second bracket (13).

2. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 1, characterized in that: An electric reciprocating push rod (211) is fixed on the outer wall of the first bracket (12), and the output end of the electric reciprocating push rod (211) is fixed on the outer wall of the boss (212).

3. The synchronous adjustment support device for inner and outer welding of spiral welded pipes according to claim 1, characterized in that: A fixed sleeve (242) is fixedly installed on the outer wall of the first bracket (12), and a sliding sleeve (24) is fixedly installed on the outer wall of the floating frame (2). The sliding sleeve (24) is slidably mounted on the outer wall of the fixed sleeve (242).

4. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 3, characterized in that: A nozzle (23) is fixedly installed on the top outer wall of the floating frame (2). An airbag (241) communicating with the nozzle (23) is fixed on the inner wall of the sliding sleeve (24). The two ends of the airbag (241) are fixed on the inner walls of the sliding sleeve (24) and the fixed sleeve (242), respectively. A one-way valve (243) communicating with the airbag (241) is fixed on the outer wall of the fixed sleeve (242).

5. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 1, characterized in that: The outer wall alignment component includes several equidistant circumferentially distributed outer positioning frames (3). Several sets of first hydraulic rods (31) are fixedly installed on the outer wall of the first support (12). The output end of the first hydraulic rod (31) is fixed on the outer wall of the outer positioning frame (3). Several first rollers (32) are rotatably connected to the outer wall of the outer positioning frame (3) via a rotating shaft.

6. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 5, characterized in that: A sleeve (33) is provided on the outer wall of the outer positioning frame (3) near the outer welding assembly (121). A second constraint spring (321) is installed on the inner wall of the sleeve (33). The shaft of the first roller (32) near the outer welding assembly (121) is slidably inserted into the sleeve (33).

7. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 1, characterized in that: The inner wall alignment component includes several equidistantly distributed inner positioning frames (4), and several sets of second hydraulic rods (41) are fixedly installed on the outer wall of the second bracket (13). The output end of the second hydraulic rod (41) is fixed on the outer wall of the inner positioning frame (4), and several second rollers (42) are rotatably connected to the outer wall of the inner positioning frame (4).

8. The synchronous adjustment support device for inner and outer welding of spiral welded pipe according to claim 7, characterized in that: The second support (13) penetrates the inner cavity of the forming device (11) and extends to the side where the first support (12) is located. The inner positioning frame (4) and the inner welding assembly (131) are both located inside the spiral tube blank (9).

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