Welding device for longitudinal submerged arc welding pipe

Abstract

The invention discloses a welding device for a longitudinal submerged arc welding pipe, which comprises a steel pipe semi-finished product which is formed by rolling a steel plate through a forming machine, a shaping mechanism which is horizontally arranged and can allow the steel pipe semi-finished product to pass through in a matched manner and form positioning in the circumferential direction of the steel pipe semi-finished product, and a V-shaped roller way conveyor which is arranged on the shaping mechanism, the V-shaped roller way conveyor is arranged at the input end of the shaping mechanism in a butt joint mode and used for feeding semi-finished steel pipe products, the welding mechanism is erected at the output end of the shaping mechanism and used for welding the splicing positions of the semi-finished steel pipe products, the aligning mechanism is arranged between the shaping mechanism and the V-shaped roller way conveyor and used for adjusting the positions of V-shaped grooves, and the limiting guide mechanism is arranged between the welding mechanism and the shaping mechanism and used for limiting the positions of the V-shaped grooves. The invention relates to the technical field of welding equipment. According to the welding device for the longitudinal submerged arc welding pipe, by introducing the alignment mechanism, automatic alignment of a V-shaped groove in a semi-finished steel pipe and the output end of the welding mechanism is achieved, dependence on manual adjustment is reduced, and the alignment precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, in particular to a welding device for a straight seam submerged arc welded pipe. Background Art

[0002] The welding device for straight seam submerged arc welding pipes is a key equipment in the field of pipeline manufacturing. Before welding, the steel plate needs to be rolled into a tubular structure by a forming machine, and then the rolled steel pipe joints are straight-seamed by a submerged arc welding machine.

[0003] After the steel plate is rolled and formed by the forming machine, the butt joint edges of the pipe fittings often cannot remain completely facing upward, that is, the butt joint edges may be tilted or misaligned to a certain extent.

[0004] In order to ensure the quality of subsequent welding, the butt edge of the pipe must be adjusted before welding so that it is precisely aligned with the welding head. This step is crucial because it is directly related to the forming quality of the weld, the pressure bearing capacity of the pipeline and the stability of the overall structure. Therefore, in the welding device for straight seam submerged arc welded pipes, the adjustment and alignment technology of the butt edge is particularly important.

[0005] In the process of implementing the present invention, the inventors discovered that the prior art has at least the following problems: At present, most manufacturers use manual observation and adjustment to ensure the alignment of the butt edge and the weld head. However, this method has many shortcomings. First, manual observation and adjustment rely on the operator's experience and skill level, so there is a large degree of subjectivity and uncertainty. Different operators may have different judgment standards and adjustment techniques, resulting in the inability to uniformly guarantee the alignment accuracy of the butt edge. Secondly, manual observation and adjustment are inefficient and cannot meet the needs of large-scale, high-efficiency pipeline production. In addition, when the butt weld is poorly assembled, such as when there are problems such as excessive gaps and excessive misalignment, manual adjustment often fails to achieve the desired effect and easily leads to defects such as slag inclusion in the bottom layer of the weld. These defects will not only reduce the strength and sealing of the weld, but may also have a serious impact on the overall performance and service life of the pipeline.

[0006] Therefore, the above technical problems need to be solved. Summary of the Invention

[0007] In order to overcome the deficiencies of the prior art, the present invention provides a welding device for a longitudinal submerged arc welded pipe, which solves the problems raised in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the basic technical solutions proposed by the present invention are: A welding device for a longitudinal submerged arc welded pipe, comprising: The semi-finished steel pipe is made by rolling the steel plate through the forming machine, and its surface is spliced ​​with V-shaped grooves distributed along its axial direction. The shaping mechanism is horizontally arranged, which can fit through the semi-finished steel pipe and form a positioning around the semi-finished steel pipe to reduce the deformation during the welding process. The V-shaped roller conveyor is connected to the input end of the shaping mechanism and is used to feed semi-finished steel pipes. The welding mechanism is installed at the output end of the shaping mechanism and is used for welding the joints of semi-finished steel pipes. The alignment mechanism is located between the shaping mechanism and the V-shaped roller conveyor and is used to adjust the position of the V-shaped groove so that it is aligned with the output end of the welding mechanism. The limiting guide mechanism is arranged between the welding mechanism and the shaping mechanism and is used for stable transportation of the semi-finished steel pipes after the V-grooves are aligned.

[0009] Preferably, the alignment mechanism is composed of a monitoring component respectively mounted on the upper middle part and the side of one side of the input end of the shaping mechanism and a first driving component for rotating the semi-finished steel pipe, and the monitoring component is electrically connected to the first driving component.

[0010] Preferably, the monitoring assembly includes two slide rails distributed in the vertical direction and two slide seats slidably assembled on the two slide rails, as well as a fixed plate assembled on the two slide seats and a travel switch fixedly installed on the fixed plate. Both slide seats are threaded with locking screws for positioning them.

[0011] Preferably, the first driving assembly includes an L-shaped plate and a first cylinder and a first trough box respectively arranged on the outside and inside of the L-shaped plate, as well as two first rollers rotatably assembled in the first trough box through a first belt transmission assembly and a first servo motor fixedly installed on the outside of the first trough box for driving the two first rollers, the output end of the first servo motor passes through the first trough box and is coaxially fixedly connected to one of the first rollers, the output end of the first cylinder passes through the L-shaped plate and is fixedly connected to the first trough box, and both sides of the first trough box are fixedly connected with first guide columns that can movably pass through the L-shaped plate.

[0012] Preferably, the position limiting guide mechanism includes a frame and a position limiting assembly installed on the top thereof, and two second driving assemblies symmetrically distributed on both sides of the frame for the movement of the semi-finished steel pipe product are respectively provided.

[0013] Preferably, the limiting assembly includes a second cylinder erected in the vertical direction, the output end of the second cylinder passes through the frame and is fixedly connected to a rubber liner, the bottom of the rubber liner is provided with a V-shaped strip adapted to the V-shaped groove, and the rubber liner is provided with a scraping surface on one side adjacent to the forming mechanism and two symmetrically distributed chip removal surfaces are provided on both sides of the scraping surface.

[0014] Preferably, the second driving assembly includes a third cylinder and a second trough box respectively arranged on the outer side and the inner side of the frame, and a plurality of second rollers rotatably assembled in the second trough box and a second servo motor installed outside the second trough box for driving the plurality of second rollers. The output end of the second servo motor passes through the second trough box and is coaxially fixedly connected to one of the second rollers, and any two adjacent second rollers are connected by a second belt drive assembly. The output end of the third cylinder passes through the side of the frame and is fixedly connected to the second trough box. Both sides of the second trough box are fixedly connected with second guide columns that can movably pass through the side of the frame.

[0015] Preferably, the shaping mechanism includes two mounting seats symmetrically distributed in the upper and lower parts, several splicing blocks assembled to the inner sides of the mounting seats by bolts, and two end plates fixedly mounted on both sides between the two mounting seats. The inner sides of several of the splicing blocks are provided with arc grooves that fit closely with the outer walls of the semi-finished steel pipes. The middle part of the end plate is provided with a through hole for the semi-finished steel pipes to fit through. Both sides of the inner side of the mounting seat are provided with T-slots distributed along the length direction thereof for the sliding adjustment of the bolt heads.

[0016] Preferably, the welding mechanism includes a submerged arc welding machine, and the left and right sides of the output end of the submerged arc welding machine are respectively equipped with a conductive nozzle and a flux tube, and a material blocking frame with a three-sided enclosed structure is set below the two through elastic accessories.

[0017] Preferably, it also includes a recovery mechanism laid under the welding mechanism, the recovery mechanism includes a box body and a number of rollers evenly distributed along the axial direction of the semi-finished steel pipe and mounted on the box body to support the semi-finished steel pipe during welding. The top of the box body and between any two adjacent rollers are sunken and covered with a screen plate.

[0018] The beneficial effects of the present invention are: 1. Improve alignment accuracy: By introducing the alignment mechanism, the V-groove on the semi-finished steel pipe and the output end of the welding mechanism are automatically aligned, reducing dependence on manual adjustment and improving alignment accuracy.

[0019] 2. Improve production efficiency: The application of automated alignment and conveying mechanisms makes the entire welding process more efficient, meeting the needs of large-scale, high-efficiency pipeline production.

[0020] 3. Reduce welding defects: Through the coordinated action of the alignment mechanism, shaping mechanism and limiting guide mechanism, defects such as slag inclusion caused by poor assembly of butt welds are effectively avoided, and the quality and strength of the welds are improved.

[0021] 4. Enhanced structural stability: The precise docking and welding process makes the overall structure of the pipeline more stable, with stronger pressure bearing capacity, and extends the service life of the pipeline.

[0022] 5. Easy to maintain: The welding device of the present invention has a reasonable structural design, and the components are tightly connected, which is easy to maintain and service, thereby reducing the equipment failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a semi-finished steel pipe according to the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the alignment mechanism of the present invention; Figure 4 It is a structural diagram of the monitoring component of the present invention; Figure 5 Schematic diagram of the structure of the first drive assembly of the present invention; Figure 6 Schematic diagram of the structure of the limiting guide mechanism of the present invention; Figure 7 Schematic diagram of the structure of the limit assembly of the present invention; Figure 8 is a schematic structural diagram of the second drive assembly of the present invention; Figure 9 It is a structural schematic diagram of the shaping mechanism of the present invention; Figure 10 It is a structural schematic diagram of the welding mechanism of the present invention; Figure 11 It is a structural schematic diagram of the recovery mechanism of the present invention; Description of reference numerals: 100. Semi-finished steel pipes; 110, V-groove; 200, finalized organization; 210, mounting base; 220, bolt; 230, splicing block; 240, end plate; 250, arc groove; 260, through hole; 270, T-slot; 300, V-type roller conveyor; 400, welding mechanism; 410, submerged arc welding machine; 420, contact nozzle; 430, flux tube; 440, elastic fitting; 450, material retaining frame; 500, alignment mechanism; 510, monitoring component; 520, first driving component; 5110, slide rail; 5120, slide seat; 5130, fixed plate; 5140, travel switch; 5150, locking screw; 5210, L-shaped plate; 5220, first cylinder; 5230, first trough box; 5240, first belt drive assembly; 5250, first roller; 5260, first servo motor; 5270, first guide post; 600, limit guide mechanism; 610, frame; 620, limit assembly; 630, second drive assembly; 6210, second cylinder; 6220, rubber liner; 6230, V-shaped bar; 6240, scraping surface; 6250, chip removal surface; 6310, third cylinder; 6320, second trough box; 6330, second roller; 6340, second servo motor; 6350, second belt drive assembly; 6360, second guide post; 700, recycling agencies; 710, box body; 720, roller; 730, screen plate. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1 and Figure 2 The present invention provides a technical solution: a welding device for straight seam submerged arc welded pipes, comprising a semi-finished steel pipe 100, which is formed by rolling a steel plate through a forming machine, and whose surface is spliced ​​with V-shaped grooves 110 distributed along its axial direction; a forming mechanism 200, which is horizontally arranged, can be adapted to penetrate the semi-finished steel pipe 100 and form a positioning on the circumference of the semi-finished steel pipe 100 to reduce its deformation during the welding process; a V-shaped roller conveyor 300, which is arranged at the input end of the forming mechanism 200, is used for the semi-finished steel pipe. The semi-finished steel pipe 100 is fed, the welding mechanism 400 is set at the output end of the shaping mechanism 200, and is used for welding operations at the joints of the semi-finished steel pipe 100. The alignment mechanism 500 is set between the shaping mechanism 200 and the V-shaped roller conveyor 300, and is used for adjusting the position of the V-shaped groove 110 so that it is aligned with the output end of the welding mechanism 400. The limiting guide mechanism 600 is set between the welding mechanism 400 and the shaping mechanism 200, and is used for stably conveying the semi-finished steel pipe 100 after the V-shaped groove 110 is aligned.

[0026] Based on the above-mentioned structural setting, the straight seam submerged arc welded pipe welding device is composed of a semi-finished steel pipe 100, a shaping mechanism 200, a V-shaped roller conveyor 300, a welding mechanism 400, an alignment mechanism 500 and a limiting guide mechanism 600. Before the rolling process, the steel plate is machined on the splicing edge to prepare the weld groove to ensure the groove angle so that the two splicing edges of the steel plate form a V-shaped groove 110 after splicing. Specifically, during the working process, the rolled semi-finished steel pipe 100 is conveyed into the shaping mechanism 200 by the V-shaped roller conveyor 300, and the shaping mechanism 200 is moved to the shaping mechanism 200. 00 Through the internal arc groove 250, the semi-finished steel pipe 100 is circumferentially positioned to ensure that it will not produce excessive deformation during the welding process. At the same time, in the shaping mechanism 200, the weld position can be adjusted with the help of the alignment mechanism 500. First, the first drive component 520 is activated to drive the semi-finished steel pipe 100 to rotate. Once the monitoring component 510 detects the V-shaped groove 110, the monitoring component 510 will send a signal to the first drive component 520. At this time, the first drive component 520 stops and resets to the initial state. After the alignment is completed, the limit guide mechanism 600 starts to The aligned semi-finished steel pipe 100 is prevented from deflecting or shaking during the subsequent transportation process, and the two second drive components 630 can drive the semi-finished steel pipe 100 to be transported backward. When the aligned semi-finished steel pipe 100 is transported to the welding mechanism 400, the submerged arc welding machine 410 starts working to perform straight seam welding on the weld. The straight seam submerged arc welding pipe welding device, by introducing the alignment mechanism 500, realizes the automatic alignment of the V-groove 110 on the semi-finished steel pipe 100 and the output end of the welding mechanism 400, reduces the dependence on manual adjustment, improves the alignment accuracy, and automates the alignment. The application of the butt welding device 500 and the conveying mechanism makes the entire welding process more efficient, meeting the needs of large-scale and high-efficiency pipeline production. Through the coordinated action of the alignment mechanism 500, the shaping mechanism 200 and the limiting guide mechanism 600, defects such as slag inclusion caused by poor assembly of the butt weld are effectively avoided, and the quality and strength of the weld are improved. The precise butt welding and welding process makes the overall structure of the pipeline more stable and the pressure-bearing capacity stronger, thereby extending the service life of the pipeline. The welding device of the present invention has a reasonable structural design, the components are tightly connected, easy to maintain and maintain, and the equipment failure rate is reduced.

[0027] Further, see Figure 3 The alignment mechanism 500 is composed of a monitoring component 510 respectively assembled on the upper middle part and the side of one side of the input end of the shaping mechanism 200 and a first driving component 520 for rotating the steel pipe semi-finished product 100. The monitoring component 510 is electrically connected to the first driving component 520.

[0028] Further, see Figure 3 and Figure 4The monitoring assembly 510 includes two vertically distributed slide rails 5110, two slides 5120 slidably mounted on the two slide rails 5110, a fixed plate 5130 mounted on the two slides 5120, and a limit switch 5140 fixedly mounted on the fixed plate 5130. Locking screws 5150 are threaded through each of the two slides 5120 for positioning. By adjusting the position of the slides 5120, the installation position of the limit switch 5140 can be precisely adjusted during installation, ensuring that the detection end of the limit switch 5140 can press against the outer wall of the semi-finished steel pipe 100. As the semi-finished steel pipe 100 rotates, when the V-groove 110 aligns with the detection end of the limit switch 5140, the detection end of the limit switch 5140 is pressed downward into the V-groove 110, thereby triggering the limit switch 5140.

[0029] Further, see Figure 3 and Figure 5 The first driving assembly 520 includes an L-shaped plate 5210 and a first cylinder 5220 and a first trough box 5230 respectively arranged on the outside and inside of the L-shaped plate 5210, as well as two first rollers 5250 rotatably assembled in the first trough box 5230 through a first belt transmission assembly 5240 and a first servo motor 5260 fixedly installed on the outside of the first trough box 5230 for driving the two first rollers 5250. The output end of the first servo motor 5260 passes through the first trough box 5230 and is coaxially fixedly connected to one of the first rollers 5250. The output end of the first cylinder 5220 passes through the L-shaped plate 5210 and is fixedly connected to the first trough box 5230. Both sides of the first trough box 5230 are fixedly connected with first guide columns 5270 that can movably pass through the L-shaped plate 5210. Among them, the first cylinder 5220 cooperates with the two first guide pillars 5270 to adjust the positions of the two first rollers 5250. In the initial stage, the output end of the first cylinder 5220 extends outward to drive the two first rollers 5250 to fit the outer wall of the steel pipe semi-finished product 100. In cooperation with the first servo motor 5260, the two first rollers 5250 can be driven to rotate with the help of the first belt drive assembly 5240, thereby realizing the rotation of the steel pipe semi-finished product 100. When the V-groove 110 is aligned, the first servo motor 5260 stops rotating, and the output end of the first cylinder 5220 retracts and resets.

[0030] Further, see Figure 6 The limiting guide mechanism 600 includes a frame 610 and a limiting assembly 620 mounted on top thereof. Two symmetrically positioned second drive assemblies 630 are provided on either side of the frame 610 to provide movement for the semi-finished steel pipe 100. The limiting assembly 620 is used to position the V-groove 110 upward, while the two second drive assemblies 630 provide driving force for the movement of the semi-finished steel pipe 100.

[0031] Further, see Figure 6 and Figure 7 The limiting assembly 620 includes a second cylinder 6210 erected in the vertical direction. The output end of the second cylinder 6210 passes through the frame 610 and is fixedly connected to a rubber liner 6220. The bottom of the rubber liner 6220 is provided with a V-shaped bar 6230 that is compatible with the V-shaped groove 110. The rubber liner 6220 is provided with a scraping surface 6240 on one side adjacent to the forming mechanism 200, and two symmetrically distributed chip discharge surfaces 6250 are provided on both sides of the scraping surface 6240. Among them, the bottom of the rubber liner 6220 fits in with the outer wall of the semi-finished steel pipe 100. With the help of the outward extension of the output end of the second cylinder 6210, it is driven downward to fit the outer wall of the semi-finished steel pipe 100. Then, the V-shaped bar 6230 is clamped in the V-shaped groove 110 to limit the V-shaped groove 110. At the same time, the scraping surface 6240 cooperates with the chip removal surface 6250 to clean the inside of the V-shaped groove 110 to ensure the cleanliness of the weld.

[0032] Further, see Figure 6 and Figure 8 The second driving assembly 630 includes a third cylinder 6310 and a second trough box 6320 respectively arranged on the outer side and inner side of the frame 610, as well as a plurality of second rollers 6330 rotatably assembled in the second trough box 6320 and a second servo motor 6340 installed outside the second trough box 6320 for driving the plurality of second rollers 6330. The output end of the second servo motor 6340 passes through the second trough box 6320 and is coaxially fixedly connected to one of the second rollers 6330, and any two adjacent second rollers 6330 are connected by a second belt transmission assembly 6350. The output end of the third cylinder 6310 passes through the side of the frame 610 and is fixedly connected to the second trough box 6320. Both sides of the second trough box 6320 are fixedly connected with a second guide column 6360 that can movably pass through the side of the frame 610. The second driving assembly 630 can drive a plurality of second rollers 6330 to rotate by means of a second servo motor 6340 and a plurality of second belt transmission assemblies 6350, thereby pushing the semi-finished steel pipe 100 to move and be transported.

[0033] Further, see Figure 9The shaping mechanism 200 includes two mounting seats 210 symmetrically distributed in the upper and lower parts, a plurality of splicing blocks 230 assembled on the inner side of the mounting seats 210 by bolts 220, and two end plates 240 fixedly mounted on both sides between the two mounting seats 210. The inner sides of the plurality of splicing blocks 230 are provided with arc grooves 250 that fit the outer wall of the semi-finished steel pipe 100. The middle part of the end plate 240 is provided with a through hole 260 for the semi-finished steel pipe 100 to fit through. Both sides of the inner side of the mounting seat 210 are provided with T-slots 270 distributed along its length direction for the sliding adjustment of the head of the bolt 220. Among them, two mounting seats 210 symmetrically distributed in the upper and lower parts provide a stable support base for the steel pipe semi-finished product 100, and several splicing blocks 230 are assembled on the inner side of the mounting seat 210 by bolts 220, which can fit tightly against the outer wall of the steel pipe semi-finished product 100 to fix the steel pipe. In addition, T-slots 270 are provided on both sides of the inner side of the mounting seat 210 to allow the head of the bolt 220 to slide and adjust therein, that is, the positions of the bolt 220 and the splicing block 230 are adjusted to adapt to steel pipe semi-finished products 100 of different lengths, thereby further enhancing the adaptability and flexibility of the shaping mechanism 200.

[0034] Further, see Figure 10 The welding mechanism 400 includes a submerged arc welding machine 410. A conductive tip 420 and a flux tube 430 are mounted on the left and right sides of the output end of the submerged arc welding machine 410, respectively. A retaining frame 450 with a three-sided enclosed structure is provided below the conductive tip 420 and flux tube 430 via an elastic fitting 440. The retaining frame 450 with a three-sided enclosed structure is mounted outside the conductive tip 420 and flux tube 430. The retaining frame 450 is pressed against the outer wall of the semi-finished steel pipe 100 by the elastic fitting 440. During the welding process, this prevents the flux from falling and accumulates the flux to a certain extent, thereby ensuring the submerged arc welding effect.

[0035] Further, see Figure 11 , further comprising a recycling mechanism 700 laid below the welding mechanism 400. The recycling mechanism 700 comprises a box body 710 and a plurality of rollers 720 evenly distributed along the axial direction of the semi-finished steel pipe 100 and mounted on the box body 710 for supporting the semi-finished steel pipe 100 during the welding process. The top of the box body 710 and between any two adjacent rollers 720 are sunken and covered with a screen plate 730. As the steel pipe is transported, the weld seam portion of the steel pipe moves out of the material blocking frame 450, and the flux at the weld falls into the recycling mechanism 700. The provision of the screen plate 730 can prevent the screening of waste materials and slag, thereby facilitating the subsequent recycling and reuse of the flux.

[0036] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A welding device for a straight seam submerged arc welded pipe, characterized in that: include: A semi-finished steel pipe (100) is formed by rolling a steel plate through a forming machine, and its surface is provided with V-shaped grooves (110) distributed along its axial direction; The shaping mechanism (200) is arranged horizontally and can be adapted to penetrate the semi-finished steel pipe (100) and be positioned in the circumferential direction of the semi-finished steel pipe (100) to reduce deformation during welding; A V-shaped roller conveyor (300) is arranged at the input end of the shaping mechanism (200) and is used for feeding the semi-finished steel pipe (100); A welding mechanism (400) is mounted on the output end of the shaping mechanism (200) and is used for welding the joints of the semi-finished steel pipe (100); An alignment mechanism (500) is provided between the shaping mechanism (200) and the V-shaped roller conveyor (300) and is used to adjust the position of the V-shaped groove (110) so as to align it with the output end of the welding mechanism (400); The limiting guide mechanism (600) is provided between the welding mechanism (400) and the shaping mechanism (200) and is used for stably conveying the semi-finished steel pipe (100) after the V-grooves (110) are aligned.

2. The welding device for a straight seam submerged arc welded pipe according to claim 1, characterized in that: The alignment mechanism (500) is composed of a monitoring component (510) respectively mounted on the upper middle portion and the side of one side of the input end of the shaping mechanism (200) and a first driving component (520) for rotating the semi-finished steel pipe (100). The monitoring component (510) is electrically connected to the first driving component (520).

3. The welding device for a straight seam submerged arc welded pipe according to claim 2, characterized in that: The monitoring assembly (510) includes two slide rails (5110) both distributed in the vertical direction and two slide seats (5120) respectively slidably assembled on the two slide rails (5110), as well as a fixed plate (5130) assembled on the two slide seats (5120) and a travel switch (5140) fixedly mounted on the fixed plate (5130). The two slide seats (5120) are both threaded with a locking screw (5150) for positioning them.

4. The welding device for a straight seam submerged arc welded pipe according to claim 2, characterized in that: The first driving assembly (520) comprises an L-shaped plate (5210), a first cylinder (5220) and a first trough box (5230) respectively arranged on the outside and inside of the L-shaped plate (5210), two first rollers (5250) rotatably assembled in the first trough box (5230) via a first belt transmission assembly (5240), and a first servo motor (5260) fixedly mounted on the outside of the first trough box (5230) for driving the two first rollers (5250), the output end of the first servo motor (5260) passing through the first trough box (5230) and being coaxially fixedly connected to one of the first rollers (5250), the output end of the first cylinder (5220) passing through the L-shaped plate (5210) and being fixedly connected to the first trough box (5230), and first guide pillars (5270) movably passing through the L-shaped plate (5210) being fixedly connected on both sides of the first trough box (5230).

5. The welding device for a straight seam submerged arc welded pipe according to claim 1, characterized in that: The position limiting guide mechanism (600) comprises a frame (610) and a position limiting assembly (620) mounted on the top thereof. Two symmetrically distributed second driving assemblies (630) for the movement of the semi-finished steel pipe product (100) are respectively provided on both sides of the frame (610).

6. The welding device for a straight seam submerged arc welded pipe according to claim 5, characterized in that: The limiting assembly (620) includes a second cylinder (6210) erected in a vertical direction. The output end of the second cylinder (6210) passes through the frame (610) and is fixedly connected to a rubber liner (6220). The bottom of the rubber liner (6220) is provided with a V-shaped strip (6230) adapted to the V-shaped groove (110). The rubber liner (6220) is provided with a scraping surface (6240) on one side adjacent to the shaping mechanism (200), and two symmetrically distributed chip removal surfaces (6250) are provided on both sides of the scraping surface (6240).

7. The welding device for a straight seam submerged arc welded pipe according to claim 5, characterized in that: The second driving assembly (630) includes a third cylinder (6310) and a second trough box (6320) respectively arranged on the outer side and the inner side of the side of the frame (610), as well as a plurality of second rollers (6330) rotatably assembled in the second trough box (6320) and a second servo motor (6340) installed outside the second trough box (6320) for driving the plurality of second rollers (6330). The output end of the second servo motor (6340) passes through the second trough box (6320) and is coaxially fixedly connected to one of the second rollers (6330), and any two adjacent second rollers (6330) are connected in transmission via a second belt transmission assembly (6350). The output end of the third cylinder (6310) passes through the side of the frame (610) and is fixedly connected to the second trough box (6320). Both sides of the second trough box (6320) are fixedly connected with second guide columns (6360) that are movably passed through the side of the frame (610).

8. The welding device for a straight submerged arc welded pipe according to claim 1, characterized in that: The shaping mechanism (200) comprises two mounting seats (210) symmetrically distributed in an upper and lower direction, a plurality of splicing blocks (230) assembled on the inner sides of the mounting seats (210) by means of bolts (220), and two end plates (240) fixedly mounted on both sides between the two mounting seats (210), wherein the inner sides of the plurality of splicing blocks (230) are provided with arcuate grooves (250) adapted to fit the outer wall of the semi-finished steel pipe (100), a through hole (260) adapted to fit through the semi-finished steel pipe (100) is provided in the middle of the end plate (240), and T-slots (270) distributed along the length direction of the inner sides of the mounting seat (210) are provided on both sides thereof for sliding adjustment of the heads of the bolts (220).

9. The welding device for a straight seam submerged arc welded pipe according to claim 1, characterized in that: The welding mechanism (400) comprises a submerged arc welding machine (410), wherein the left and right sides of the output end of the submerged arc welding machine (410) are respectively equipped with a conductive nozzle (420) and a flux tube (430), and a material blocking frame (450) with a three-sided enclosed structure is provided below the two via an elastic fitting (440).

10. The welding device for a straight submerged arc welded pipe according to claim 1, characterized in that: The invention also includes a recovery mechanism (700) laid below the welding mechanism (400), wherein the recovery mechanism (700) includes a box body (710) and a plurality of rollers (720) evenly distributed along the axial direction of the semi-finished steel pipe (100) and mounted on the box body (710) to support the semi-finished steel pipe (100) during welding. A screen plate (730) is installed on the top of the box body (710) and between any two adjacent rollers (720).

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