A steel pipe welding system

Abstract

The utility model provides a kind of steel pipe welding system, it is related to steel pipe manufacturing technical field.Steel pipe welding system includes the door frame with walking mechanism, multiple roller welding trolley and welding roller mechanism, the top beam of door frame is provided with first welding equipment and the welding wire of first welding equipment is set down, door frame can be moved along the calibration direction perpendicular to top beam;Each roller welding trolley is used to carry one steel roll and can move through the area surrounded by door frame along calibration direction, and every two roller welding trolleys are used to move towards along calibration direction to make the butt joint of two steel rolls carried respectively;Welding roller mechanism is provided on each roller welding trolley, and welding roller mechanism includes multiple rollers distributed along the circumference of steel roll, and roller is used to support steel roll and drive steel roll rotate around the axis of steel roll.Two kinds of welding tasks are completed in door frame, effectively solve the problem that the demand of site is big and the efficiency is low caused by multiple hoisting.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe manufacturing technology, and more specifically, to a steel pipe welding system. Background Technology

[0002] In steel pipe manufacturing, steel coils are longitudinally welded to form steel pipes. The longitudinal welding of single-segment steel pipes and the circumferential welding of multi-segment steel pipes have long employed a separate workstation design. This requires factories to have dedicated areas for longitudinal and circumferential welding, resulting in the production site being divided into multiple independent units. This significantly increases factory space occupancy and makes the production line layout dispersed and complex. Especially in the production of multi-segment steel pipes, after the longitudinal welding of a single segment is completed, it must be transferred to the circumferential welding station using hoisting equipment for assembly and circumferential welding. This repeated hoisting process consumes a significant amount of time, significantly slowing down the production pace. Utility Model Content

[0003] The problem this invention addresses is: how to improve the welding efficiency of multi-segment steel pipes.

[0004] To address the aforementioned problems, this utility model provides a steel pipe welding system, comprising a portal frame with a traveling mechanism, multiple welding trolleys, and a welding roller mechanism. A first welding device is mounted on the top crossbeam of the portal frame, with the welding wire of the first welding device facing downwards. The portal frame can move along a designated direction perpendicular to the top crossbeam. Each welding trolley carries a steel coil and can move along the designated direction through the area enclosed by the portal frame. Two welding trolleys move towards each other along the designated direction to allow the two steel coils they carry to be joined together. Each welding trolley is equipped with the welding roller mechanism, which includes multiple rollers distributed circumferentially around the steel coil. The rollers support the steel coil and drive it to rotate around its axis.

[0005] Optionally, the steel pipe welding system further includes a three-dimensional adjustment structure, which is connected to the crossbeam and driven by the first welding equipment to adjust the position of the first welding equipment.

[0006] Optionally, the steel pipe welding system further includes a two-dimensional adjustment structure for steel coils. Each of the rolling welding trolleys is equipped with the two-dimensional adjustment structure for steel coils. The two-dimensional adjustment structure for steel coils includes a first drive structure, a first slide, a second drive structure, and a second slide. The first drive structure is connected to the rolling welding trolley and is drivenly connected to the first slide. The first slide is slidably connected to the rolling welding trolley. The second drive structure is connected to the first slide and is drivenly connected to the second slide. The second slide is slidably connected to the first slide. The welding roller mechanism is disposed on the second slide. The sliding direction of the first slide is perpendicular to the sliding direction of the second slide.

[0007] Optionally, the steel pipe welding system further includes a cross-shaped adjustment bracket, which is used to be installed inside the steel coil and includes multiple support arms. Each support arm includes a threaded sleeve and a strut. The ends of the sleeves of the multiple support arms away from the struts converge at the same point, and the ends of the struts of the multiple support arms away from the sleeves abut against the inner wall of the steel coil.

[0008] Optionally, the traveling mechanism is configured as a roller traveling mechanism, which is connected to the vertical column of the portal frame and has a guide rail along the calibration direction that cooperates with the traveling wheels of the roller traveling mechanism.

[0009] Optionally, the plurality of the roll welding trolleys include an adjacent first trolley and a second trolley. The first slide on the first trolley is provided with a first positioning structure at the end facing the second trolley, and the first slide on the second trolley is provided with a second positioning structure at the end facing the first trolley. The first positioning structure is used to connect with the second positioning structure so that the axial ends of the two steel coils on the first trolley and the second trolley are joined to form a circumferential seam to be welded.

[0010] Optionally, the steel pipe welding system further includes a stiffening ring, which is used to be fitted over the outside of the steel coil after the longitudinal seam is welded.

[0011] Optionally, the steel pipe welding system further includes a second welding device located inside the steel coil and used to move along the longitudinal seam of the steel coil; the longitudinal seam includes an outer seam and an inner seam along its depth direction, the second welding device welding the inner seam and the first welding device welding the outer seam.

[0012] Optionally, the welding trolley is configured as a railcar.

[0013] Optionally, the steel pipe welding system further includes an anti-corrosion workshop, the roll welding trolley can be moved into the anti-corrosion workshop, and the anti-corrosion workshop is equipped with an anti-corrosion spraying structure for spraying anti-corrosion material onto the steel coil.

[0014] Compared with related technologies, the steel pipe welding system of this utility model has a first welding device installed on the top crossbeam of the portal frame. The portal frame can move along the marked direction perpendicular to the top crossbeam, so that the welding wire of the first welding device facing downward can cover the entire length of the longitudinal seam of the steel coil, thereby realizing continuous welding of the longitudinal seam and ensuring that the welding operation is accurately positioned to the longitudinal seam to complete the welding and manufacturing of the steel pipe in a single stage. By moving a welding trolley carrying a steel coil along a designated direction through the area enclosed by the portal frame, and with the welding roller mechanism connected to the welding trolley, including rollers distributed circumferentially along the steel coil, the rollers provide stable support for the steel coil. The welding trolley facilitates the adjustment of the steel coil's position, thus meeting the longitudinal seam welding requirements of a single segment of steel coil within a limited space. Furthermore, by allowing two welding trolleys to move towards each other, the two steel coils they each carry can be joined together, enabling the axial ends of adjacent steel coils to be pushed closer to form a circumferential seam, thereby achieving the alignment of the circumferential seams of multi-segment steel coils. The rollers can then drive the steel coil to rotate around its axis, ensuring stable rotation of the steel coil. In this way, two welding tasks are completed within the portal frame, effectively solving the problems of large space requirements and low efficiency caused by multiple hoisting operations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the steel pipe welding system in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure in an embodiment of the present invention, showing the docking of two adjacent rolling welding trolleys and the formation of a welding circumferential seam between two adjacent steel coils. Figure 3 This is a schematic diagram illustrating the process of welding the inner weld of the longitudinal seam using the second welding equipment and the outer weld of the longitudinal seam using the first welding equipment in this embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1-Gate frame; 11-Traveling mechanism; 12-Top beam; 13-First welding equipment; 14-Vertical column; 2-Roll welding trolley; 3-Welding roller mechanism; 31-Roller; 4-Steel coil; 41-Longitudinal seam; 5-Two-dimensional adjustment structure for steel coil; 51-First drive structure; 52-First drive structure; 53-Second drive structure; 54-Second slide table; 6-M-shaped adjustment bracket; 7-Stiffening ring; 8-Second welding equipment. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] In the attached figures, the X-axis represents the left-right position, with the positive direction of the X-axis representing the right side and the negative direction representing the left side; the Y-axis represents the front-back position, with the positive direction of the Y-axis representing the front and the negative direction representing the back; the Z-axis represents the up-down position, with the positive direction of the Z-axis representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the X, Y, and Z axes are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] It should be noted that the terms "first," "second," etc., used in the description and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0020] Combination Figures 1 to 3 As shown, this utility model embodiment provides a steel pipe welding system, including a portal frame 1 with a traveling mechanism 11, multiple welding trolleys 2, and a welding roller mechanism 3. The top crossbeam 12 of the portal frame 1 is equipped with a first welding device 13 with the welding wire of the first welding device 13 facing downwards. The portal frame 1 can move along a calibrated direction perpendicular to the top crossbeam 12. Each welding trolley 2 is used to carry a steel coil 4 and can move along the calibrated direction through the area enclosed by the portal frame 1. Every two welding trolleys 2 are used to move towards each other along the calibrated direction so that the two steel coils 4 they carry are joined together. Each welding trolley 2 is equipped with a welding roller mechanism 3, which includes multiple rollers 31 distributed along the circumference of the steel coil 4. The rollers 31 are used to support the steel coil 4 and drive the steel coil 4 to rotate around the axis of the steel coil 4.

[0021] Specifically, the portal frame 1 can be constructed using steel structures or aluminum alloy profiles, for example, by welding rectangular steel pipes to form a stable frame structure. The traveling mechanism 11 can be implemented using linear guides and sliders, for example, by a motor-driven rack and pinion transmission, or by a hydraulic cylinder to move along a calibrated direction. The welding trolley 2 can move by using a pulley system mounted at its bottom in conjunction with a ground track, for example, by using chain or belt drive to drive the trolley to slide along the track. The rollers 31 can be made of rubber or metal, for example, by using bearings mounted on a bracket to reduce friction. Furthermore, the rollers 31 can be driven by a motor and a reducer, for example, by using a synchronous belt drive or chain drive to transmit power to the roller shaft, and the rotation of the rollers 31 causes the steel coil 4 to rotate.

[0022] When welding the longitudinal seam 41, the marking square is the axial direction of the steel coil 4, that is, the Y-axis direction. The steel coil 4 is suspended on the welding roller mechanism 3 and supported by the roller 31, which remains stationary. The welding trolley 2 moves along the marking direction to directly below the crossbeam 12 of the portal frame 1, so that one end (starting end) of the longitudinal seam 41 is aligned with the welding wire of the first welding device 13 (the welding wire coincides with the centerline of the longitudinal seam 41). The welding trolley 2 remains stationary, and the portal frame 1 moves along the marking direction so that the first welding device 13 moves along the marking direction to the other end (ending end) of the longitudinal seam 41, completing the welding of the longitudinal seam 41. After the steel coil 4 on the current welding trolley 2 is welded and moves away from the portal frame 1 in the specified direction, the next welding trolley 2 moves the next steel coil 4 in the specified direction to the bottom of the crossbeam 12 and stops. Then, the portal frame 1 moves the first welding equipment 13 in the opposite direction in the specified direction to complete the welding of the longitudinal seam 41 of the next steel coil 4. This cycle is repeated, and the first welding equipment 13 can weld the longitudinal seam 41 of multiple steel coils 4.

[0023] When welding circumferential seams, such as Figure 2 As shown, taking two welding trolleys 2 as an example, after the longitudinal seams 41 of the two steel coils 4 on the two welding trolleys 2 are welded, the two welding trolleys 2 move closer to each other so that the two steel coils 4 are close to each other. The gap between the axially close ends of the two steel coils 4 is the circumferential seam. Since the single-section steel pipe is made by welding single-section steel coils 4, and the welding of the longitudinal seam 41 of the single-section steel coil 4 is before the circumferential seam welding, the gap between the axially close ends of the two steel coils 4 is also the gap between the axially close ends of the two steel pipes. After the circumferential seam is formed, the two welding trolleys 2 move synchronously to the bottom of the crossbeam 12 of the portal frame 1. After the welding wire of the first welding equipment 13 is aligned with the circumferential seam and the welding machine requirements are met, the portal frame 1 and the two welding trolleys 2 remain stationary. The rollers 31 on the two welding trolleys 2 drive the two steel coils 4 to rotate synchronously around the axis of the steel coils 4. After one rotation, the first welding equipment 13 completes the welding of the circumferential seam.

[0024] Therefore, in this embodiment, a first welding device 13 is provided on the top crossbeam 12 of the portal frame 1. The portal frame 1 can move along the marked direction perpendicular to the top crossbeam 12, so that the welding wire of the first welding device 13 facing downward can cover the entire length of the longitudinal seam 41 of the steel coil 4, thereby realizing continuous welding of the longitudinal seam 41, ensuring that the welding operation is accurately positioned to the longitudinal seam 41, so as to complete the welding manufacturing of the single-stage steel pipe. The welding trolley 2, carrying a steel coil 4, moves along the designated direction through the area enclosed by the portal frame 1. The welding roller mechanism 3 is connected to the welding trolley 2 and includes rollers 31 distributed circumferentially along the steel coil 4. The rollers 31 provide stable support for the steel coil 4. The welding trolley 2 can easily adjust the position of the steel coil 4, thus meeting the welding requirements of the longitudinal seam 41 of a single segment of steel coil 4 within a limited space. Furthermore, by having two welding trolleys 2 move towards each other, the two steel coils 4 they carry can be joined together, allowing the axial ends of adjacent steel coils 4 to be pushed closer to form a circumferential seam, thereby achieving the alignment of the circumferential seams of multiple segments of steel coil 4. The rollers 31 can drive the steel coil 4 to rotate around its axis, ensuring the stable rotation of the steel coil 4. Thus, two welding tasks are completed within the portal frame 1, effectively solving the problems of large space requirements and low efficiency caused by multiple hoisting operations.

[0025] Optionally, combined Figure 1 As shown, the steel pipe welding system also includes a three-dimensional adjustment structure, which is connected to the crossbeam 12 and driven to the first welding equipment 13 for adjusting the position of the first welding equipment 13.

[0026] Specifically, the three-dimensional adjustment structure refers to the ability to adjust the position of the first welding device 13 along the X, Y, and Z axes. For example, the three-dimensional adjustment structure may include a first hydraulic cylinder connected to the crossbeam 12, a second hydraulic cylinder that extends and retracts along the Y axis, and a third hydraulic cylinder that extends and retracts along the Z axis. The first hydraulic cylinder is driven to connect to the second hydraulic cylinder via a connecting seat to adjust the position of the second hydraulic cylinder in the X-axis direction. The second hydraulic cylinder is slidably connected to the crossbeam 12 along the Y-axis direction via a slider and is driven to connect to the third hydraulic cylinder via a connecting seat to adjust the position of the third hydraulic cylinder in the Y-axis direction. The third hydraulic cylinder is connected to the first welding device 13 via a connecting seat to adjust the position of the first welding device 13 in the Z-axis direction. The position of the first welding device 13 is adjusted by the alternating extension and retraction of the first, second, and third hydraulic cylinders. Other forms may also be used instead.

[0027] Thus, the connection between the three-dimensional adjustment structure and the crossbeam 12 provides a stable support reference for the first welding equipment 13, avoiding equipment offset caused by the movement of the portal frame 1 or external vibration. The drive connection between the three-dimensional adjustment structure and the first welding equipment 13 enables the first welding equipment 13 to be flexibly adjusted in different directions, allowing the welding wire to be calibrated in real time according to the actual deviation of the longitudinal seam 41, so as to ensure that the welding wire is always aligned with the center line of the longitudinal seam 41, thereby improving the welding quality.

[0028] Optionally, combined Figure 1 As shown, the steel pipe welding system also includes a two-dimensional steel coil adjustment structure 5. Each welding trolley 2 is equipped with a two-dimensional steel coil adjustment structure 5. The two-dimensional steel coil adjustment structure 5 includes a first drive structure 51, a first slide 52, a second drive structure 53, and a second slide 54. The first drive structure 51 is connected to the welding trolley 2 and is driven to the first slide 52. The first slide 52 is slidably connected to the welding trolley 2. The second drive structure 53 is connected to the first slide 52 and is driven to the second slide 54. The second slide 54 is slidably connected to the first slide 52. The welding roller mechanism 3 is located on the second slide 54. The sliding direction of the first slide 52 is perpendicular to the sliding direction of the second slide 54.

[0029] Specifically, the first slide 52 moves along the X-axis and is connected to the welding trolley 2 via a sliding connection pair. The second slide 54 moves along the Y-axis and is connected to the first slide 52 via a sliding connection pair. Both the first drive structure 51 and the second drive structure 53 can be servo motors. For example, the first drive structure 51 drives the first slide 52 to move along the X-axis via a gear and rack transmission structure.

[0030] Thus, by sliding the first slide 52 to the welding trolley 2 and the second slide 54 to the first slide 52, with the sliding direction of the first slide 52 perpendicular to the sliding direction of the second slide 54, the second slide 54 and the first slide 52 can adjust the position of the welding roller mechanism 3 on the horizontal plane. Then, by connecting the drive structure 51 to the welding trolley 2 and driving the first slide 52, and by connecting the second drive structure 53 to the first slide 52 and driving the second slide 54, the position of the steel coil 4 in the horizontal plane can be precisely adjusted to improve the positioning accuracy of the steel coil 4. This also enables the longitudinal seam 41 to be quickly and accurately aligned with the welding wire of the first welding equipment 13, and enables the rapid and accurate alignment of the axial ends of adjacent steel coils during circumferential welding, thereby improving welding efficiency.

[0031] Optionally, combined Figure 1 As shown, the steel pipe welding system also includes a cross-shaped adjustment bracket 6, which is used to be installed inside the steel coil 4 and includes multiple support arms. Each support arm includes a threaded sleeve and a strut. The sleeves of the multiple support arms converge at the same point away from the struts, and the struts of the multiple support arms abut against the inner wall of the steel coil 4 at the ends away from the sleeves.

[0032] Specifically, the star-shaped adjusting bracket 6 includes eight support arms, each of which includes a threaded sleeve and a strut. The eight sleeves are distributed in a star shape and their close ends are connected. Before welding the longitudinal seam 41, the eight struts are rotated synchronously to ensure that the axial displacement of the eight struts is consistent. Then, the ends of the struts away from the sleeves are brought into contact with the inner wall of the steel coil 4. The star-shaped adjusting bracket 6 provides a uniformly distributed radial support force to the steel coil 4 inside the steel coil 4, avoiding local deformation caused by thermal stress during the welding process.

[0033] Thus, by setting a cross-shaped adjustment bracket 6 inside the steel coil 4, its unique radial structure provides all-round support for the steel coil 4. The extension and retraction length of the support rod can be precisely controlled through the threaded sleeve and strut in each support arm, so that the bracket can adapt to steel coils 4 of different diameters. After the end of the strut away from the sleeve abuts against the inner wall of the steel coil 4, the multi-point contact between the end of the strut and the inner wall of the steel coil 4 forms a stable support system, which can offset the thermal stress and gravity generated during the welding process, thereby ensuring the geometric accuracy of the longitudinal seam 41 during welding and improving the welding quality.

[0034] Optionally, combined Figure 1 As shown, the traveling mechanism 11 is a roller traveling mechanism, which is connected to the vertical column 14 of the portal frame 1, and is provided with a guide rail along the calibrated direction to cooperate with the traveling wheels of the roller traveling mechanism.

[0035] Specifically, the roller traveling mechanism 11 is a wheeled traveling structure with its own drive motor, for example, the motor directly drives the wheels to roll along the track. The traveling wheels of the roller traveling mechanism cooperate with the guide rail, and the guide rail constrains the movement path of the roller traveling mechanism 11, ensuring that the portal frame 1 moves accurately in the calibrated direction.

[0036] Thus, by setting the traveling mechanism 11 as a roller traveling mechanism and connecting it to the vertical column 14 of the portal frame 1, the rolling contact between the traveling wheels and the guide rail can significantly reduce the resistance during movement, allowing the portal frame 1 to move smoothly along the calibrated direction. The guide rail also constrains the movement trajectory of the roller traveling mechanism, ensuring that the portal frame 1 moves strictly in the calibrated direction, thereby improving the positioning accuracy of the first welding equipment 13 for the longitudinal seam 41 of the steel coil 4, and thus ensuring the stability of the welding process and the quality of the weld.

[0037] Optionally, combined Figure 2 As shown, the multiple roll welding trolleys 2 include an adjacent first trolley and a second trolley. The first slide 52 on the first trolley is provided with a first positioning structure at the end facing the second trolley, and the first slide 52 on the second trolley is provided with a second positioning structure at the end facing the first trolley. The first positioning structure is used to connect with the second positioning structure so that the axial ends of the two steel coils 4 on the first trolley and the second trolley are joined together to form a circumferential seam to be welded.

[0038] Specifically, the first positioning structure can take the form of a protrusion, a pin, or a snap-fit, while the second positioning structure can take the form of a groove, a hole, or a guide groove. For example, when welding two steel coils 4, after the first welding equipment 13 completes the welding of the longitudinal seam 41 of the two steel coils 4, the first and second carriages approach each other and stop. The linear distance between the two first sliding tables 52 is adjusted so that the two adjacent ends of the two steel coils 4 are brought together to form an annular weld. Then, the first and second positioning structures are connected to lock the two first sliding tables 52, thereby restricting the horizontal movement of the two steel coils 4 and ensuring that the width of the annular weld is consistent. Then, the portal frame 1 drives the first welding equipment 13 to the top of the annular weld. The rollers 31 on the first and second carriages synchronously drive the two steel coils 4 to rotate. After one rotation, the first welding equipment 13 completes the welding of the annular weld. It should be noted that during actual welding, the dimensions of the longitudinal seam 41 and the annular weld must meet the welding requirements; the attached drawings are only schematic representations of the weld.

[0039] Thus, a first positioning structure is provided at the end of the first slide 52 on the first car facing the second car, and a second positioning structure is provided at the end of the first slide 52 on the second car facing the first car. The first positioning structure and the second positioning structure are connected so that the axial ends of two adjacent steel coils 4 are brought close together to form a welded circumferential seam. The connection between the first positioning structure and the second positioning structure realizes the automatic and precise alignment of the axial ends of adjacent steel coils 4. The self-correction characteristics of the positioning structure are used to achieve fine adjustment, ensuring the consistency of the circumferential weld width, thereby ensuring the welding quality.

[0040] Optionally, combined Figure 2 As shown, the steel pipe welding system also includes a stiffening ring 7, which is used to be fitted onto the outside of the steel coil 4 after the longitudinal seam 41 is welded.

[0041] Specifically, the stiffening ring 7 can be a one-piece rigid ring made of metal, or it can be a segmented spliced ​​ring structure. After the longitudinal seam 41 is welded and passes welding quality inspection and defect inspection, the stiffening ring 7 is fitted onto the outside of the steel coil 4. The stiffening ring 7 can provide continuous and stable external support for the welded steel coil 4, especially reducing the risk of geometric instability caused by handling during the circumferential seam welding process of the steel coil 4.

[0042] In this way, by using the stiffening ring 7 fitted around the outside of the steel coil 4 after the longitudinal seam 41 is welded, the stiffening ring 7 applies a uniform radial constraint force to the steel coil 4, effectively offsetting the thermal stress and residual stress generated during the welding process, thereby preventing the steel coil 4 from warping or elliptical deformation during the cooling or moving stage, ensuring the shape stability of the steel coil 4 in subsequent processing steps, and thus improving the overall welding quality and system efficiency.

[0043] Optionally, combined Figure 3 As shown, the steel pipe welding system also includes a second welding device 8, which is located inside the steel coil 4 and is used to move along the longitudinal seam 41 of the steel coil 4; the longitudinal seam 41 includes an outer seam and an inner seam along its depth direction, the second welding device 8 welds the inner seam, and the first welding device 13 welds the outer seam.

[0044] Specifically, both the second welding device 8 and the first welding device 13 can be in the form of an automated guided vehicle carrying a welding torch. The difference lies only in that the first welding device 13, after adjusting the welding wire angle through a three-dimensional adjustment structure, can move along the longitudinal seam 41 using the portal frame 1, while the second welding device 8 can move autonomously along the longitudinal seam 41 via the automated guided vehicle. The depth direction of the longitudinal seam 41 can be understood as the radial direction of the steel coil 4, with the portion of the weld closer to the axis of the steel coil 4 as the inner seam and the portion farther from the axis of the steel coil 4 as the outer seam. During welding, if... Figure 3 As shown, roller 31 drives steel coil 4 to rotate, bringing longitudinal seam 41 to a lower position. The second welding device 8 then moves along longitudinal seam 41, welding the inner seam first. Then, roller 31 drives steel coil 41 to rotate again, bringing longitudinal seam 41 to a higher position, closer to the first welding device 13. The first welding device 13 moves along longitudinal seam 41 via portal frame 1 to complete the welding of the outer seam. It is understood that the weld quality needs to be checked after each welding operation; if the weld quality is low, it needs to be re-welded.

[0045] Thus, the second welding device 8 is located inside the steel coil 4 and is used to move along the longitudinal seam 41. The second welding device 8 welds the inner seam, while the first welding device 13 welds the outer seam. This allows the first welding device 13 of the portal frame 1 to handle the outer seam welding, while the second welding device 8 focuses on the inner seam welding. The first welding device 13 and the second welding device 8 establish a synchronous welding mode for the inner and outer seams, forming a spatially complementary relationship. This allows for double-sided welding without flipping the steel coil 4. Furthermore, since the two welding devices operate independently, efficiency losses caused by equipment switching and repetitive positioning are avoided, significantly improving welding quality and production efficiency.

[0046] Optionally, the welding trolley 2 can be configured as a railcar.

[0047] Specifically, the railcar can constrain the movement path of the welding trolley 2 by a preset track, thereby avoiding track deviation caused by uneven ground or external interference. In addition, the railcar can also be equipped with a drive motor and a reduction mechanism to achieve precise speed control and positioning functions.

[0048] Thus, by setting the welding trolley 2 as a railcar, the movement of the welding trolley 2 is ensured to have high directionality and stability, providing a reliable guarantee for the precise positioning of the steel coil 4 during the welding process. At the same time, the introduction of the railcar simplifies the movement control logic of the welding trolley 2, reduces the need for manual intervention, and makes the welding process of the longitudinal seam 41 of the steel coil 4 more automated and precise. Based on this, the railcar, together with the portal frame 1, the first welding equipment 13, and other components, forms a complete welding system, effectively improving the overall process quality of the steel coil welding. Through the above technical solution, not only is the problem of insufficient positioning accuracy of the steel coil solved, but welding efficiency and product quality are also significantly improved.

[0049] Optionally, the steel pipe welding system also includes an anti-corrosion workshop, the roll welding trolley 2 can be moved into the anti-corrosion workshop, and the anti-corrosion workshop is equipped with an anti-corrosion spraying structure for spraying anti-corrosion materials onto the steel coil 4.

[0050] Specifically, an anti-corrosion workshop refers to a building structure that provides a closed and controlled environment for anti-corrosion operations. It can be a steel structure workshop or a concrete workshop, and its purpose is to prevent external impurities from interfering with the spraying quality and to ensure that the anti-corrosion operation is carried out under stable conditions. An anti-corrosion spraying structure refers to the equipment system used to spray anti-corrosion materials. It can be implemented using spray gun arrays or rotary spraying devices, and its purpose is to efficiently cover the curved surfaces of steel with anti-corrosion materials.

[0051] After the multi-segment steel coil 4 is welded and the stiffening ring 7 is removed, multiple rolling welding trolleys 2 move into the anti-corrosion workshop at the same speed and through navigation methods such as rail or laser guidance. The multi-segment steel coil 4 can be transported to the anti-corrosion area without re-hoisting. After stopping at the spraying operation station, the spray gun of the anti-corrosion spraying structure sprays anti-corrosion material onto the multi-segment steel coil 4.

[0052] Thus, the welding trolley 2 can be moved into the anti-corrosion workshop. Since the welding trolley 2 has stably supported and positioned the steel coil 4 during the welding process, the steel coil 4 can be directly transported to the anti-corrosion workshop. This avoids the risks associated with steel coil positioning, time loss, and equipment wear caused by multiple hoisting operations in traditional methods, and also reduces the space requirements. Furthermore, the anti-corrosion workshop is equipped with an anti-corrosion spraying structure for spraying anti-corrosion materials onto the steel coil 4. The anti-corrosion workshop provides a closed and controllable environment for anti-corrosion operations, ensuring coating uniformity. Moreover, the anti-corrosion treatment is integrated into the welding system process, achieving seamless connection between welding and anti-corrosion procedures, effectively improving production efficiency and reducing operating costs.

[0053] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A steel pipe welding system, characterized in that, The system includes a portal frame (1) with a traveling mechanism (11), multiple welding trolleys (2), and a welding roller mechanism (3). The top beam (12) of the portal frame (1) is equipped with a first welding device (13) with the welding wire of the first welding device (13) facing downwards. The portal frame (1) can move along a designated direction perpendicular to the top beam (12). Each welding trolley (2) is used to carry a steel coil (4) and can move along the designated direction through the portal frame. The area enclosed by the frame (1) and each pair of the welding trolleys (2) are used to move towards each other along the calibrated direction so that the two steel coils (4) they carry are joined together; each of the welding trolleys (2) is provided with the welding roller mechanism (3), the welding roller mechanism (3) includes a plurality of rollers (31) distributed along the circumference of the steel coil (4), the rollers (31) are used to support the steel coil (4) and drive the steel coil (4) to rotate around the axis of the steel coil (4).

2. The steel pipe welding system according to claim 1, characterized in that, It also includes a three-dimensional adjustment structure, which is connected to the top crossbeam (12) and driven to the first welding equipment (13) for adjusting the position of the first welding equipment (13).

3. The steel pipe welding system according to claim 1, characterized in that, It also includes a two-dimensional adjustment structure (5) for steel coils. Each of the welding trolleys (2) is equipped with the two-dimensional adjustment structure (5). The two-dimensional adjustment structure (5) for steel coils includes a first drive structure (51), a first slide (52), a second drive structure (53), and a second slide (54). The first drive structure (51) is connected to the welding trolley (2) and is driven to the first slide (52). The first slide (52) is slidably connected to the welding trolley (2). The second drive structure (53) is connected to the first slide (52) and is driven to the second slide (54). The second slide (54) is slidably connected to the first slide (52). The welding roller mechanism (3) is located on the second slide (54). The sliding direction of the first slide (52) is perpendicular to the sliding direction of the second slide (54).

4. The steel pipe welding system according to claim 1, characterized in that, It also includes a cross-shaped adjustment bracket (6), which is used to be installed inside the steel coil (4) and includes multiple support arms. Each support arm includes a threaded sleeve and a strut. The sleeves of the multiple support arms are connected to the same point at the ends away from the struts. The ends of the struts of the multiple support arms are in contact with the inner wall of the steel coil (4) at the ends away from the sleeves.

5. The steel pipe welding system according to claim 1, characterized in that, The walking mechanism (11) is configured as a roller walking mechanism. The roller walking mechanism is connected to the vertical column (14) of the portal frame (1) and is provided with a guide rail along the calibration direction to cooperate with the walking wheel of the roller walking mechanism.

6. The steel pipe welding system according to claim 3, characterized in that, The multiple welding trolleys (2) include an adjacent first trolley and a second trolley. The first slide (52) on the first trolley is provided with a first positioning structure at the end facing the second trolley, and the first slide (52) on the second trolley is provided with a second positioning structure at the end facing the first trolley. The first positioning structure is used to connect with the second positioning structure so that the axial ends of the two steel coils (4) on the first trolley and the second trolley are joined together to form a circumferential seam to be welded.

7. The steel pipe welding system according to claim 1, characterized in that, It also includes a stiffening ring (7), which is used to be fitted onto the outside of the steel coil (4) after the longitudinal seam (41) is welded.

8. The steel pipe welding system according to claim 1, characterized in that, It also includes a second welding device (8), which is located inside the steel coil (4) and is used to move along the longitudinal seam (41) of the steel coil (4); the longitudinal seam (41) includes an outer seam and an inner seam along its depth direction, the second welding device (8) welding the inner seam and the first welding device (13) welding the outer seam.

9. The steel pipe welding system according to claim 1, characterized in that, The welding trolley (2) is configured as a railcar.

10. The steel pipe welding system according to any one of claims 1-9, characterized in that, It also includes an anti-corrosion workshop, the welding trolley (2) can be moved into the anti-corrosion workshop, and the anti-corrosion workshop is equipped with an anti-corrosion spraying structure, which is used to spray anti-corrosion material onto the steel coil (4).

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