Longitudinal girth welding machine

Abstract

The invention relates to the technical field of pressure-bearing special equipment manufacturing, in particular to a longitudinal girth welding machine which comprises a moving assembly, a longitudinal girth welding assembly and a longitudinal girth welding assembly. The welding assembly is used for welding the boiler barrel and comprises an inner welding unit and an outer welding unit, and the inner welding unit is located on one side of the preprocessing station and used for welding the inner side of the boiler barrel; the outer welding unit is located on one side of the outer welding station. And the welding positioning assembly is located between the pre-machining station and the outer welding station, the welding positioning assembly comprises an outer ring, a first fastening ring and a second fastening ring, the first fastening ring and the second fastening ring are installed on the inner side of the outer ring, and the first fastening ring and the second fastening ring are used for fixing the ends of the two boiler barrels needing to be assembled correspondingly. By arranging the welding positioning assembly, the ends of the two boiler barrels are kept relatively fixed, the process step of positioning and pre-welding is omitted, the inner welding unit stretches into the inner sides of the boiler barrels, and welding work of inner circular seams can be directly conducted.

Description

Technical Field

[0001] This application relates to the technical field of manufacturing pressure-bearing special equipment, and in particular to a longitudinal circumferential seam welding machine. Background Technology

[0002] In the field of pressure-bearing special equipment manufacturing, the boiler drum is an important component of the boiler, and the welding of the longitudinal and circumferential seams of the boiler drum is the first step in boiler manufacturing. The main manufacturing processes of the boiler drum are the longitudinal seam welding after rolling and the circumferential seam welding after assembly.

[0003] In the existing circumferential seam welding process, the longitudinal circumferential seam welding machine is equipped with an array of roller frames to support the pot drums that need to be assembled. The roller frames have two rollers that can slide in opposite directions. The rollers provide support points for the pot drums, and the center height of the pot drums can be adjusted by adjusting the distance between the rollers, thereby keeping the two pot drums that need to be joined concentric for positioning and pre-welding.

[0004] However, this positioning and pre-welding method is easily affected by factors such as site vibration and roller slippage. Positioning and pre-welding requires intermittent adjustment of the roller spacing of each set of roller frames to keep the two pot drums in the pair concentric. For large-diameter pot drums, continuous adjustment will greatly increase the time required for the positioning and pre-welding process, seriously affecting production efficiency. Summary of the Invention

[0005] To reduce the need for welding, this application provides a longitudinal circumferential seam welding machine.

[0006] This application provides a longitudinal circumferential seam welding machine, which adopts the following technical solution: A longitudinal circumferential seam welding machine, comprising A movable assembly for moving a pot drum includes roller frames, with a pre-processing station and an external welding station formed between the roller frames; A welding assembly for welding the boiler drum includes an inner welding unit and an outer welding unit. The inner welding unit is located on one side of the pre-processing station and is used to weld the inner side of the boiler drum. The outer welding unit is located on one side of the outer welding station and is used to weld the outer side of the boiler drum. A welding positioning assembly is located between the pre-processing station and the outer welding station. The welding positioning assembly includes an outer ring, a first fastening ring, and a second fastening ring. The first fastening ring and the second fastening ring are installed on the inner side of the outer ring. The first fastening ring and the second fastening ring are respectively used to fix the ends of the two boiler drums that need to be assembled.

[0007] By adopting the above technical solution, the existing process for processing the circumferential seam of the boiler drum is improved, enhancing the efficiency and safety of boiler drum welding. Specifically, in addition to the concentricity issue of the boiler drum mentioned in the background technology, the original process, especially for large-diameter boiler drums, involves positioning and pre-welding, which requires workers to enter the boiler drum and select several points at the circumferential seam for connection. During this process, the boiler drum needs to be rotated multiple times to adjust the angle for the workers to weld, posing certain safety risks. In the current technical solution, the boiler drums to be assembled are placed at the outer welding station and the pre-processing station, respectively. They are adjusted to the concentric position by the roller frame, and the first and second fastening rings clamp the assembled ends of the boiler drums, keeping the ends of the two boiler drums relatively fixed. This eliminates the positioning and pre-welding process step, and the inner welding unit extends into the inner side of the boiler drum to directly perform the welding work of the inner circumferential seam.

[0008] Preferably, the welding positioning assembly further includes a lifting platform and a first driving component, the first driving component being connected to the lifting platform, and the outer ring being disposed on the lifting platform; both the first fastening ring and the second fastening ring are provided with fasteners for adaptably clamping pot drums of different sizes.

[0009] By adopting the above technical solution, for boiler drums of different diameters, the roller frame needs to adjust the roller spacing to adjust the height of the boiler drum so that the welding working surface is adjusted to the position of the welding torch. The welding positioning component needs to be raised and lowered synchronously with the boiler drum to avoid the situation where the two sides are at different heights, the boiler drum cannot keep concentric and pressure is applied to the first and second fastening rings, causing damage to local components. The fasteners can adjust the clamping position to adapt to clamping boiler drums of different sizes.

[0010] Preferably, the fasteners are arranged at intervals along the circumference of the outer ring. The fasteners include a telescopic drive member and a contact member. The fixed end of the telescopic drive member is disposed on the outer ring. One end of the contact member is rotatably disposed on the first fastening ring and the second fastening ring, and the other end of the contact member is rotatably disposed on the telescopic end of the telescopic drive member.

[0011] By adopting the above technical solution, the boiler drum is effectively clamped. Multiple fasteners form a clamp when the boiler drum changes direction, maintaining a stable clamping position. The telescopic drive of each fastener extends and retracts synchronously, pushing the contact element to rotate around its connection point with the fastening ring, changing the distance from the contact point of the contact element to the center of the outer ring.

[0012] Preferably, the lifting platform is provided with a concentricity detection component, which is located between the first fastening ring and the second fastening ring. The concentricity detection component includes a light source, a camera, and a processing unit. The light source is tilted relative to the outer ring, the camera is aimed at the gap between the first fastening ring and the second fastening ring, and the processing unit is electrically connected to the roller frame.

[0013] By adopting the above technical solution, the concentricity of the two docked boiler drums can be detected and adjusted in real time. Specifically, when docking boiler drums of the same size, if the concentricity is insufficient, a height difference will appear at the circumferential joint of the boiler drums. When the light source shines at an angle onto the circumferential joint, a shadow will be projected on the boiler drum due to the height difference at the joint. When two light sources are used to shine on the circumferential joint from both sides, although no shadow will be produced, the height difference will still cause the brightness of the shaded area to be lower than that of the surrounding area. The camera acquires an image of the circumferential seam under illumination and converts the image into a grayscale image. The brightness changes of the original image are converted into grayscale changes in the grayscale image. The processing unit detects the grayscale of the detection area in the image. When the grayscale of the detection area is lower than that of the neighboring areas, it is determined that the concentricity of the boiler drum is insufficient. The deviation is calculated based on the area of ​​the low grayscale area. The processing unit sends an adjustment signal to the roller frame to keep the boiler drum concentric. In addition, the concentricity detection component is fixed on the lifting platform. When the boiler drum rotates, the light illumination detection area changes with the rotation of the boiler drum, thereby realizing real-time detection.

[0014] Preferably, the transport component further includes a slide rail, the roller frame includes a sliding platform, the sliding platform is slidably disposed on the slide rail, the sliding platform is slidably disposed with two sliding members and a second driving member, the second driving member drives the sliding members to slide, each of the sliding members is rotatably disposed with a roller, and the roller is driven by a third driving member.

[0015] By adopting the above technical solution, the roller frame realizes the axial movement of the boiler drum through the sliding platform, completes the docking of the boiler drum and the transfer of the boiler drum from the processing station to the external welding station. By adjusting the distance between the relative sliding parts, the support point of the roller relative to the boiler drum is changed, thereby changing the position height of the boiler drum; the third driving part drives the roller to rotate, and under the action of friction, the drum rotates with the roller.

[0016] Preferably, the sliding platform is further provided with a slope cutting component, which includes a telescopic platform, the telescopic platform having at least one telescopic stroke and being provided with a slope cutting tool.

[0017] By adopting the above technical solution, the end of the boiler drum is beveled. Specifically, pre-cutting the bevel before welding the boiler drum can fully fill the weld, increase the effective cross-sectional area of ​​the weld, and improve the load-bearing capacity and strength of the welded joint. In existing boiler manufacturing processes, the boiler needs to bevel cutting in a separate beveling device for positioning and pre-welding. This technical solution integrates the beveling assembly, avoiding the boiler drum transfer step and improving production efficiency. During the cutting process, the telescopic platform adjusts the height of the beveling tool to align it with the bottom of the boiler drum end. The beveling tool, in conjunction with the rollers, rotates to complete the beveling of the end.

[0018] Preferably, the slope-cutting assembly further includes a pressure roller.

[0019] By adopting the above technical solution, the quality of beveling is guaranteed. Specifically, when beveling a small-sized and lightweight boiler drum, the beveling tool is prone to jumping due to the resistance of the roller head rotation. The pressure roller extends into and presses against the inside of the boiler drum, forming a three-point clamp with the two rollers, which limits the jumping. The beveling tool can always stay in contact with the end of the boiler drum for beveling.

[0020] Preferably, the internal welding unit includes a first column, a first slide table slidably mounted on the first column, a first cantilever slidably mounted on the first slide table, and a first welding torch mounted on the first cantilever; and / or, The external welding unit includes a second column, a second slide table slidably mounted on the second column, a second cantilever slidably mounted on the second slide table, and a second welding torch mounted on the second cantilever.

[0021] By adopting the above technical solution, it is convenient for the inner and outer welding units to adjust the position of the welding torch to complete the welding of the longitudinal and circumferential seams. Specifically, when welding the inner longitudinal seam, the inner welding unit adjusts the height of the first slide table so that the first welding torch is close to the welding working surface. Then, the first welding torch is started, and the first cantilever slides back and forth several times until the welding is completed. When welding the inner circumferential seam, the inner welding unit adjusts the height of the first slide table so that the first welding torch is close to the welding working surface. Then, the first welding torch is started, and the roller rotates to make the boiler drum rotate several times until the welding is completed. When welding the outer longitudinal seam, the outer welding unit adjusts the height of the second slide table so that the second welding torch is close to the welding working surface. Then, the second welding torch is started, and the pulley frame at the outer welding station supports the boiler drum to slide until the welding is completed. When welding the outer circumferential seam, the outer welding unit adjusts the height of the second slide table so that the second welding torch is close to the welding working surface. Then, the second welding torch is started, and the roller rotates to make the boiler drum rotate several times until the welding is completed.

[0022] In summary, this application includes the following beneficial technical effects: By setting up welding positioning components to keep the ends of the two boiler drums relatively fixed, the pre-welding process is eliminated. The inner welding unit extends into the inner side of the boiler drum and can directly perform the welding of the inner circumferential seam. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the welding positioning assembly structure according to an embodiment of this application; Figure 3 yes Figure 2 A magnified view of a section of A; Figure 4This is a schematic diagram of the structure of the concentric detection component according to an embodiment of this application; Figure 5 This is a schematic diagram of the roller frame and the slope cutting assembly according to an embodiment of this application; Figure 6 This is a schematic diagram of the welding assembly according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached drawings: 1. Welding positioning assembly; 11. Lifting platform; 12. Outer ring; 13. First driving component; 14. First fastening ring; 15. Second fastening ring; 16. Fastener; 161. Telescopic driving component; 162. Contact component; 163. Jaw; 17. Bearing wheel; 18. Limiting wheel; 2. Moving assembly; 21. Roller frame; 211. Sliding platform; 212. Second driving component; 213. Sliding component; 214. Roller; 215. Third driving component; 22. Slide rail; 3. Welding assembly; 31. External welding unit; 311. Second column; 312. Second slide table; 313. Second cantilever; 314, second welding torch; 32, internal welding unit; 321, first column; 322, first slide table; 323, first cantilever; 324, first welding torch; 4, concentric detection assembly; 41, light source; 42, camera; 5, slope cutting assembly; 51, telescopic platform; 511, base plate; 512, primary platform; 5121, primary guide rod; 5122, primary drive component; 5123, primary platform plate; 513, secondary platform; 5131, secondary guide rod; 5132, secondary drive component; 5133, secondary platform plate; 52, winch; 53, slope cutting tool; 54, pressure roller. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0026] Example: See Figures 1-2A longitudinal circumferential seam welding machine includes a welding positioning assembly 1, a moving assembly 2, and a welding assembly 3. The welding positioning assembly 1 includes a lifting platform 11 and an outer ring 12. The lifting platform 11 is installed below ground and connected to a telescopic cylinder as a first driving component 13, which drives the lifting platform 11 to move vertically. The outer ring 12 is rotatably mounted on the lifting platform 11. A first fastening ring 14 and a second fastening ring 15 are fixedly installed on the inner side of the outer ring 12. Both the first fastening ring 14 and the second fastening ring 15 are coaxial with the outer ring 12 and are installed at intervals along the axis of the outer ring 12. Fasteners 16 are installed on both the first fastening ring 14 and the second fastening ring 15, and the fasteners 16 are arranged at intervals around the circumference of the first fastening ring 14 or the second fastening ring 15 to which they are located. The moving assembly 2 includes a roller frame 21 and a slide rail 22. The slide rail 22 is installed on the front and rear sides of the outer ring 12 along the axis of the outer ring 12. The roller frame 21 is slidably installed on the slide rail 22. The roller frames 21 on the front and rear sides of the outer ring 12 respectively form a pre-processing station and an outer welding station. The welding assembly 3 includes an outer welding unit 31 and an inner welding unit 32. The outer welding unit 31 is located on one side of the outer welding station, and the inner welding unit 32 is located at the end of the pre-processing station.

[0027] In the original processing technology, large-diameter boiler drum processing required workers to enter the boiler drum and select several points at the circumferential seam for positioning and pre-welding. During this process, the boiler drum needed to be rotated multiple times to adjust the angle for the worker to weld, which posed certain safety risks. The boiler drum clamping and positioning processing technology improves the positioning and pre-welding steps in the original process, increasing efficiency and safety. The boiler drums to be assembled are placed at the outer welding station and the pre-processing station, respectively. They are adjusted to a concentric position by the roller frame 21. The first fastening ring 14 and the second fastening ring 15 clamp the assembled ends of the boiler drums, keeping the ends of the two boiler drums relatively fixed. This eliminates the positioning and pre-welding steps. The inner welding unit 32 extends into the inner side of the boiler drum, allowing direct welding of the inner circumferential seam.

[0028] For pot drums of different diameters, the roller frame 21 needs to adjust the distance between the rollers 214 to adjust the height of the pot drum so that the welding working surface is aligned with the welding torch. The welding positioning assembly 1 needs to be raised and lowered synchronously with the pot drum to avoid uneven heights on both sides, which would prevent the pot drum from remaining concentric and apply pressure to the first fastening ring 14 and the second fastening ring 15, thus causing damage to local components. The fastener 16 can adjust the clamping position to accommodate pot drums of different sizes.

[0029] See Figure 2The outer ring 12 is composed of two T-shaped cross-section rings connected axially. Rollers are installed on both sides of the lifting platform 11. The rollers are arranged parallel to the axial direction of the outer ring 12. One end of the roller is connected to a servo motor as a driving component. Two bearing wheels 17 are coaxially installed on each roller. The outer ring 12 is rolled on the bearing wheels 17. The bearing wheels 17 are integrally formed with a rim to prevent the outer ring 12 from dislodging. Limiting wheels 18 are also rotatably installed on both sides of the lifting platform 11. The limiting wheels 18 press against the inner wing plate of the outer ring 12 to rotate, further limiting the outer ring 12.

[0030] See Figures 2-3 In this embodiment, the fastener 16 includes a telescopic cylinder as a telescopic drive member 161 and a contact member 162. One end of the contact member 162 is mounted on the first fastening ring 14 and the second fastening ring 15 where it is located. The fixed end of the first telescopic cylinder is rotatably mounted on the outer ring 12. The telescopic end of the telescopic cylinder passes through the first fastening ring 14 and the second fastening ring 15 where it is located and is rotatably connected to the contact member 162 to achieve effective clamping of the pot drum. Multiple fasteners 16 form a clamping mechanism when the pot drum changes direction, maintaining stable clamping. The telescopic drive members 161 of each fastener 16 extend and retract synchronously, pushing the contact member 162 to rotate around its connection point with the fastening ring where it is located, changing the distance from the contact point of the contact member 162 to the center of the outer ring 12.

[0031] See Figure 3 The contact element 162 is equipped with a fractal vise-type jaw 163 facing the boiler drum. The jaw 163 is divided into four levels, each level consisting of a fan-shaped piece. The first level fan-shaped piece is rotatably mounted on the contact element 162. Starting from the first level fan-shaped piece, each fan-shaped piece is rotatably mounted with two fan-shaped pieces from the next level. The foremost fan-shaped piece is called the contact piece. Before the contact piece fully contacts the workpiece, there will always be a non-zero torque that makes it rotate until it fully contacts the workpiece. After all the contact pieces and the workpiece are fully in contact, the pressure will be more evenly distributed, thus improving the fit between the fastener 16 and the boiler drum.

[0032] See Figure 4 The lifting platform 11 is equipped with a concentric detection component 4. The communication detection component includes a light source 41, a camera 42 and a processing unit. The light source 41 and the camera 42 are both installed in the middle of the lifting platform 11 and are arranged in the form of "light source 41-camera 42-light source 41" along the axis of the outer ring 12. The light sources 41 are all tilted and can pass through the gap between the two rings and between the first fastening ring 14 and the second fastening ring 15 to illuminate the annular seam of the boiler drum. The camera 42 captures the image of the annular seam of the boiler drum.

[0033] When two pots of the same size are joined together, if the concentricity is insufficient, a height difference will appear at the circumferential joint of the pot. When the light source 41 shines obliquely onto the circumferential joint, a shadow will be projected on the pot due to the height difference at the joint. When two light sources 41 are used to shine on the circumferential joint from both sides, although no shadow is produced, the height difference will still cause the brightness of the obscured area to be lower than that of the surrounding area. The camera 42 acquires an image of the circumferential joint position under the illumination of the light source 41 and converts the image into a grayscale image. The brightness change of the original image is converted into the grayscale change of the grayscale image. The processing unit detects the grayscale of the detection area in the image. When the grayscale of the detection area is lower than that of the neighboring area, it is determined that the concentricity of the pot is insufficient. The deviation is calculated based on the area of ​​the low grayscale area. The processing unit sends an adjustment signal to the roller frame 21 to maintain the concentricity of the pot. In addition, the concentricity detection component 4 is fixed on the lifting platform 11. When the pot rotates, the light-illuminated detection area changes with the rotation of the pot, thereby realizing real-time detection.

[0034] See Figure 5 Each roller frame 21 includes a sliding platform 211 slidably mounted on a slide rail 22. A lead screw is installed inside the sliding platform 211, and the lead screw is arranged perpendicular to the axis of the outer ring 12. The roller frame 21 moves the pot drum axially through the sliding platform 211 to complete the docking of the pot drum and the transfer of the pot drum from the machining station to the welding station. A servo motor is installed on one side of the sliding platform 211 as a second drive component 212. The second drive component 212 is connected to the lead screw. The lead screw has two threads with opposite directions and each thread is installed with There are sliding members 213. The second driving member 212 drives the lead screw to rotate, and the sliding members 213 move synchronously towards or away from each other. Adjusting the distance between the relative sliding members 213 changes the support point of the roller 214 relative to the pot drum, thereby changing the position and height of the pot drum. Rollers 214 are rotatably mounted on each sliding member 213. One side of the roller 214 is driven by a gearbox and a servo motor as a third driving member 215. The third driving member 215 causes the roller 214 to rotate after being driven by the gearbox. Under the action of friction, the drum rotates with the roller 214. The roller frames 21 located at the outer welding station are connected in pairs.

[0035] See Figure 5Two sets of slope-cutting assemblies 5 are installed on the roller frame 21 located at the inner welding station, respectively installed on one side of the roller frame 21 at both ends of the pre-processing station. The slope-cutting assembly 5 includes a telescopic platform 51, which is hinged to the sliding platform 211. A winch 52 is installed on the sliding platform 211, and the rope of the winch 52 is attached to the telescopic platform 51. This arrangement can prevent the slope-cutting assembly 5 from causing obstacles when the boiler drum is lowered. The telescopic platform 51 includes a base plate 511, a primary platform 512, and a secondary platform 513. The primary platform 512 includes a primary guide rod 5121, a primary drive member 5122, and a primary platform plate 5123. The primary drive member 5122 and the primary guide rod 5121 are connected to the base plate 511. The ends of the primary drive member 5122 and the primary guide rod 5121 away from the base plate 511 are connected to the primary platform plate 5123. The secondary platform 513 includes a secondary guide rod 5131, a secondary drive member 5132, and a secondary platform plate 5133. The secondary drive member 5132 is connected to the primary platform plate 5123, and the secondary guide rod 5131 is connected to the base plate 511. The ends of the secondary drive member 5132 and the secondary guide rod 5131 away from the base plate 511 are connected to the secondary platform plate 5133. In this embodiment, both the primary drive member 5122 and the secondary drive member 5132 are telescopic cylinders. A beveling tool 53 is mounted on the primary platform plate 5123. The beveling tool 53 is driven by a motor. In other embodiments, the beveling tool 53 may also be equipped with a drive unit that drives it to move along the axis of the outer ring 12.

[0036] Pre-cutting the bevel before welding the boiler drum can fully fill the weld, increase the effective cross-sectional area of ​​the weld, and improve the load-bearing capacity and strength of the welded joint. In existing boiler manufacturing processes, the boiler needs to bevel cutting in a separate beveling device for positioning and pre-welding. The beveling assembly 5 integrates the beveling process, avoiding the boiler drum transfer step and improving production efficiency. During the cutting process, the winch 52 starts, pulling the telescopic platform 51 to rotate and adjust it to the working state. The telescopic platform 51 adjusts the height of the beveling cutter 53 to align it with the bottom of the boiler drum end. The beveling cutter 53, in conjunction with the roller 214, rotates to complete the beveling of the end.

[0037] Reference Figure 5 A pressure roller 54 is installed on the secondary platform plate 5133, and the pressure roller 54 is connected to a drive component that drives it to move along the axis of the outer ring 12. The pressure roller 54 ensures the quality of the bevel cutting. Specifically, when the pot drum with small size and light weight is beveled, it is easy to jump because the beveling tool 53 has resistance to the rotation of the roller 214. The pressure roller 54 extends into and presses against the inside of the pot drum, forming a three-point clamp with the two rollers 214, which limits the occurrence of jumping. The beveling tool 53 can always keep in contact with the end of the pot drum for bevel cutting.

[0038] See Figure 1 and Figure 6 The inner welding unit 32 includes a first column 321, a first slide table 322 slidably connected to the first column 321, a first cantilever 323 slidably connected to the first slide table 322, and a first welding torch 324 connected to the first cantilever 323. The outer welding unit 31 includes a second column 311, a second slide table 312 slidably connected to the second column 311, a second cantilever 313 slidably connected to the second slide table 312, and a second welding torch 314 connected to the second cantilever 313. The sliding of the first slide table 322, the first cantilever 323, the second slide table 312, and the second cantilever 313 is all driven by a driving component. When welding the inner longitudinal seam, the inner welding unit 32 adjusts the height of the first slide 322 so that the first welding torch 324 is close to the welding working surface. Then, the first welding torch 324 is started, and the first cantilever 323 slides back and forth several times until the welding is completed. When welding the inner circumferential seam, the inner welding unit 32 adjusts the height of the first slide 322 so that the first welding torch 324 is close to the welding working surface. The first welding torch 324 is started, and the roller 214 rotates to make the boiler drum rotate several times until the welding is completed. When welding the outer longitudinal seam, the outer welding unit 31 adjusts the height of the second slide table 312 so that the second welding gun 314 is close to the welding working surface. Then the second welding gun 314 is started, and the roller frame 21 at the outer welding station slides with the boiler drum until the welding is completed. When welding the outer circumferential seam, the outer welding unit 31 adjusts the height of the second slide table 312 so that the second welding gun 314 is close to the welding working surface. The second welding gun 314 is started, and the roller 214 rotates to make the boiler drum rotate several times until the welding is completed.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A longitudinal seam welding machine characterized by, include: The moving component (2) is used to move the pot drum and includes a roller frame (21) with a pre-processing station and an external welding station formed between the roller frames (21); The welding assembly (3) is used to weld the boiler drum, including an inner welding unit (32) and an outer welding unit (31). The inner welding unit (32) is located on one side of the pre-processing station and is used to weld the inner side of the boiler drum. The outer welding unit (31) is located on one side of the outer welding station and is used to weld the outer side of the boiler drum. A welding positioning assembly (1) is located between the pre-processing station and the outer welding station. The welding positioning assembly (1) includes an outer ring (12), a first fastening ring (14), and a second fastening ring (15). The first fastening ring (14) and the second fastening ring (15) are installed on the inner side of the outer ring (12). The first fastening ring (14) and the second fastening ring (15) are respectively used to fix the ends of the two pot drums that need to be assembled.

2. A longitudinal seam welding machine according to claim 1, characterized in that: The welding positioning assembly (1) further includes a lifting platform (11) and a first driving member (13). The first driving member (13) is connected to the lifting platform (11), and the outer ring (12) is disposed on the lifting platform (11). The first fastening ring (14) and the second fastening ring (15) are both provided with fasteners (16) for adaptably clamping pots of different sizes.

3. A longitudinal seam welding machine according to claim 2, characterized in that: The fasteners (16) are arranged circumferentially along the outer ring (12). Each fastener (16) includes a telescopic drive (161) and a contact (162). The fixed end of the telescopic drive (161) is disposed on the outer ring (12). One end of the contact (162) is rotatably disposed on the first fastening ring (14) and the second fastening ring (15). The other end of the contact (162) is rotatably disposed on the telescopic end of the telescopic drive (161).

4. A longitudinal seam welding machine as defined in claim 2, wherein: The lifting platform (11) is equipped with a concentric detection component (4), which is located between the first fastening ring (14) and the second fastening ring (15). The concentric detection component (4) includes a light source (41), a camera (42), and a processing unit. The light source (41) is tilted relative to the outer ring (12), the camera (42) is aligned with the gap between the first fastening ring (14) and the second fastening ring (15), and the processing unit is electrically connected to the roller frame (21).

5. A longitudinal seam welding machine as defined in claim 1 wherein: The transport assembly further includes a slide rail (22), and the roller frame (21) includes a sliding platform (211). The sliding platform (211) is slidably disposed on the slide rail (22). The sliding platform (211) is slidably disposed with two sliding members (213) and a second driving member (212). The second driving member (212) drives the sliding members (213) to slide. Each sliding member (213) is rotatably disposed with a roller (214), and the roller (214) is driven by a third driving member (215).

6. A longitudinal seam welding machine as defined in claim 5, wherein: The sliding platform (211) is also provided with a slope cutting component (5), which includes a telescopic platform (51), the telescopic platform (51) having at least one telescopic stroke and being provided with a slope cutting tool (53).

7. A longitudinal seam welding machine as defined in claim 6, wherein: The slope cutting assembly (5) also includes a pressure roller (54).

8. A longitudinal circumferential seam welding machine according to claim 1, characterized in that: The internal welding unit (32) includes a first column (321), a first slide table (322) slidably mounted on the first column (321), a first cantilever (323) slidably mounted on the first slide table (322), and a first welding torch (324) mounted on the first cantilever (323); and / or, The external welding unit (31) includes a second column (311), a second slide table (312) is slidably provided on the second column (311), a second cantilever (313) is slidably provided on the second slide table (312), and a second welding torch (314) is provided on the second cantilever (313).

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