Welding equipment and manufacturing process for oil pipe processing

Abstract

This invention relates to welding equipment and manufacturing process for oil pipe processing, belonging to the field of welding technology. The invention includes a frame, a circular track, a traveling carriage, an arc-shaped track, a support, and a welding torch holder. The frame is equipped with a positioning mechanism for keeping two oil pipes to be welded coaxially aligned. The circular track extends laterally and is used to fix one of the oil pipes to the outside. The traveling carriage is slidably mounted on the circular track along its extension direction. The arc-shaped track is connected to the traveling carriage, and its plane is perpendicular to the radius of the oil pipe to be welded. The arc-shaped opening of the arc-shaped track faces the weld seam. The support is movable along the extension direction of the arc-shaped track and mounted on the arc-shaped track. The welding torch holder is movable along the radius of the arc-shaped track and mounted on the support. A traveling drive structure is provided between the support and the welding torch holder for driving the welding torch holder to reciprocate. This invention can improve the stability of oil pipe welds.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding equipment and manufacturing process for oil pipe processing. Background Technology

[0002] In the field of oil extraction and transportation, pipelines are key components that connect underground and surface areas and withstand complex loads. In modern oil and gas engineering, long-distance oil pipelines are usually assembled by welding together multiple short-distance pipeline sections. During welding, bevels are typically machined at the ends of the pipelines first. The weld joints are then cleaned to remove oil and rust. A positioning mechanism is used to join the two pipeline sections together, and then a suitable welding method is selected for welding.

[0003] For example, the patent with authorization announcement number CN120816252B discloses a large pipe welding device. The device includes a welding table, and two parallel guide rails are fixedly connected to the top surface of the welding table. Movable pipe pushers are provided at both ends of the guide rails. Support components for supporting pipes are provided on both sides of the welding table. The device supports the large pipe through the first support device and the second support device on both sides of the welding table. When supporting, the straight surface of the irregular support block faces the outer wall of the large pipe, so that the rotating rod one perpendicular to the large pipe rolls with the pipe wall, which facilitates the pipe pusher to push the large pipe to move laterally, so that the two ends of the large pipe to be welded are aligned. When welding, the irregular support block is rotated so that the rotating rod two on the arc surface of the irregular support block rolls and contacts the large pipe, which facilitates the pipe pusher to drive the large pipe to rotate and realize circumferential welding.

[0004] In existing technologies, equipment used for circumferential welding of thick circular pipes typically employs a straight-through transverse surfacing welding method. This involves moving the welding torch at a constant speed along the circumference of the pipe while simultaneously oscillating back and forth in a direction parallel to the pipe's axis. After welding one layer within the V-groove, the next layer is welded in the same manner until the V-groove is completely filled, forming a complete weld. All weld beads are stacked within the groove along its width. While this welding method is simple to operate, it suffers from severe heat accumulation along the weld width and residual stress accumulation along the weld width, which affects the stability of the weldment. Summary of the Invention

[0005] This invention provides a welding device for oil pipe processing to solve the technical problem that existing oil pipe welding devices use a straight-through transverse overlay welding method, resulting in severe heat accumulation and dense residual stress distribution along the weld width after welding, leading to poor stability of the welded parts.

[0006] The present invention also provides a manufacturing process for welding oil pipes, which results in oil pipes of better quality and more reliable performance.

[0007] To solve the above problems, the present invention provides a welding equipment for oil pipe processing, which adopts the following technical solution:

[0008] A welding device for oil pipe processing includes a frame, on which a positioning mechanism is provided for keeping two oil pipes to be welded coaxially aligned, and further includes:

[0009] A circular track, with its axis extending to the left and right, is used to secure the outer side of one of the oil pipes.

[0010] The traveling vehicle is slidably installed on the circular track along the extension direction of the circular track, and a traveling drive structure is provided between the traveling vehicle and the circular track to drive the traveling vehicle to move on the circular track.

[0011] An arc-shaped track is connected to the traveling vehicle. The plane containing the arc-shaped guide line of the arc-shaped track is perpendicular to the radius of the oil pipe to be welded, and the arc-shaped opening of the arc-shaped track faces the welding bevel between the two oil pipes. The plane that is perpendicular to the plane containing the arc-shaped guide line of the arc-shaped track and bisects the arc-shaped track is defined as the plane of symmetry. The central axis of the oil pipe to be welded is located in the plane of symmetry, and the central normal of the arc-shaped track is located in the mating plane of the two oil pipes to be welded.

[0012] The support is installed on the arc track and can move circumferentially along the arc track. A second travel drive structure is provided between the arc track and the support. The second travel drive structure is used to drive the support to move back and forth on the arc track.

[0013] A welding torch holder is mounted on a support and is capable of moving radially along an arc-shaped track. The support is provided with a travel drive structure three for driving the welding torch holder to move radially back and forth along the arc-shaped track.

[0014] The welding torch is installed in the welding torch holder, with the output end of the welding torch located within the center normal of the arc-shaped track and pointing towards the welding bevel.

[0015] Using the above technical solution, the second driving structure drives the support to move on the circular track, adjusting the position of the support so that the driving direction of the third driving structure on the support is inclined to the extension direction of the welding groove. The third driving structure moves back and forth within the welding groove, and the weld bead formed is inclined to the width direction of the welding groove. Compared with the existing technology of straight transverse welding with the weld bead direction along the width direction of the welding groove, the path of the welding rod moving once between the two side walls of the welding groove is increased, which can reduce the heat accumulation problem during the welding process and is conducive to the formation of a finer and more uniform weld crystal structure.

[0016] After the first driving structure propels the vehicle to travel at a constant speed on the circular track to complete one layer of welding, the second driving structure propels the support to travel on the arc-shaped track again. The driving direction of the third driving structure on the support is adjusted to be symmetrical with the driving direction of the previous wheel about the plane of symmetry. Then, another layer is welded on top of the weld bevel. The two stacked weld layers form an X-shaped structure. The adjacent weld layers are arranged in an interlaced manner. The residual stress components of the weld beads along the extension direction of the weld bevel can partially cancel each other out, which can homogenize residual stress, eliminate harmful deformation, and improve the stability of the weldment. The interlaced superposition of the two adjacent weld metal layers can better cover the gaps generated between adjacent weld beads in the same layer, resulting in a better sealing effect of the weldment at the welding position.

[0017] Because the output end of the welding torch points towards the welding groove and is located on the center normal of the arc track, while the center normal of the arc track is located in the mating plane of the two oil pipes and the axis of the oil pipes is located in the plane of symmetry, when the first traveling drive structure drives the support to move on the arc track, the welding torch can always maintain the position where the output end points towards the welding groove and is located within the center normal of the arc track. When the driving direction of the third traveling drive structure is adjusted, the point of action of the welding torch does not change. In this way, after the welding torch has welded around the welding groove once, when the direction of the third traveling drive structure is adjusted to start the arc again, the initial position of starting the arc again is the position where the welding stopped during the previous round of welding. This can ensure that the weld bead in the welding groove is fused and continuous, the interlayer transition is smooth and uniform, the weld metal is well formed, and the performance of the two welded oil pipes is more stable.

[0018] Furthermore, the circular track is provided with a plurality of toothed holes evenly arranged around its axis. The walking drive structure includes a gear 1 rotatably connected to the walking vehicle around a rotation axis extending to the left and right. The gear 1 meshes with the circular track through the toothed holes. When the gear 1 is driven to rotate, it meshes with the circular track through each toothed hole, thereby driving the walking vehicle to move on the circular track.

[0019] Furthermore, the second walking drive structure includes an arc-shaped rack coaxially connected to the arc-shaped track, a gear two rotatably connected to the support, and a rotary drive motor three connected to the support for driving the gear two to rotate. The gear two meshes with the arc-shaped rack, and the rotary drive motor three drives the gear two to rotate, so as to drive the support to reciprocate along the extension direction of the arc-shaped track.

[0020] Furthermore, the annular track includes two semi-annular tracks that are spliced ​​together. One side of each semi-annular track is coaxial and connected to a corresponding semi-annular connecting seat. The semi-annular connecting seat is provided with multiple pressure rods evenly arranged around the central axis. The pressure rods extend radially along the semi-annular connecting seat and slide on the semi-annular connecting seat in the radial direction. Between the pressure rods and the semi-annular connecting seat, there is an elastic element three that can extend radially along the semi-annular connecting seat. When the two semi-annular connecting seats are spliced ​​together, each elastic element three is compressed and applies an elastic force toward the center of the semi-annular connecting seat to the pressure rod, so that the pressure rod is pressed against the outer wall of the oil pipe.

[0021] With the above technical solution, when the two semi-circular connecting seats are connected, multiple pressure rods press against the oil pipe, thereby keeping the annular track and the oil pipe circumferentially fixed on the oil pipe. The installation method is simple. At the same time, since the pressure rods can slide elastically, the fixing structure can be installed on oil pipes of various sizes, making it more widely applicable.

[0022] Furthermore, the frame is equipped with two movable seats symmetrically arranged on both sides of the central axis of the oil pipe to be welded. Each movable seat can slide in the front-back direction. Each movable seat is equipped with a semi-annular fixed seat. The two semi-annular fixed seats are symmetrically arranged front-back with their openings facing each other. The frame is equipped with a second movable drive mechanism, which is connected to the two movable seats for driving the two movable seats to move closer to each other synchronously, so as to drive the two semi-annular fixed seats to move closer to each other and abut against each other. The two semi-annular fixed seats are coaxially connected to the side of the two semi-annular connecting seats facing away from the semi-annular track. The semi-annular connecting seats and the semi-annular fixed seats maintain a relatively fixed axial position, and the semi-annular connecting seats can rotate relative to the semi-annular fixed seats. The frame is also equipped with a first rotation drive mechanism for driving the oil pipe to be welded to rotate.

[0023] By adopting the above technical solution, a second moving drive mechanism drives two semi-annular fixed seats to abut against each other, thereby pressing a pressure rod onto the oil pipe to achieve relative fixation between the annular track and the oil pipe. This eliminates the need for manual assembly of the two semi-annular connecting seats to install the annular track onto the oil pipe, resulting in higher assembly efficiency. The semi-annular connecting seats can rotate relative to the semi-annular fixed seats, meaning the oil pipe can rotate relative to the semi-annular fixed seats. The first rotating drive mechanism can drive the oil pipe to rotate. During welding, the oil pipe can be driven to rotate. When the traveling trolley moves from the top of the annular track to the middle of the annular track, it can drive the oil pipe to rotate 90 degrees in the opposite direction of the traveling trolley's movement, so that the traveling trolley is back at the top of the annular track and moves downwards from the top of the annular track. This allows the molten pool to naturally spread out and adhere to the oil pipe under the action of gravity when the welding torch is used for welding, resulting in better fusion of the molten metal with the oil pipe, making it easier to obtain a smooth and flat weld surface, and achieving better welding results.

[0024] Furthermore, the positioning mechanism includes two positioning supports arranged symmetrically on the left and right sides. Both positioning supports are slidably mounted on the frame in the left and right direction. Each positioning support includes a horizontal plate and a vertical plate. The horizontal plate is provided with a V-shaped support for supporting the oil pipe to be welded. The frame is also provided with a moving drive mechanism for driving the two positioning supports to move closer to each other synchronously. When the two positioning supports move closer to each other synchronously, they can drive the two oil pipes to be welded to be coaxially spliced ​​together.

[0025] Using the above technical solution, when positioning two oil pipes to be welded, the two oil pipes are first placed randomly on the V-shaped support seats on the two positioning supports, driving the two positioning supports to move closer to each other. The vertical plate pushes the two oil pipes to automatically achieve splicing and centering, resulting in good positioning effect.

[0026] Furthermore, the semi-circular fixed seat is slidably mounted on the movable seat in the vertical direction, and the movable seat is provided with a lifting mechanism that is pulsatorically connected to the semi-circular fixed seat to adjust the height position of the semi-circular fixed seat.

[0027] Using the above technical solution, the height of the semi-circular fixing seat can be adjusted, making the device suitable for fixing oil pipes of different diameters.

[0028] Furthermore, each of the two V-shaped support seats is provided with a set of rotation drive mechanism one. The rotation drive mechanism one includes two actuating rollers with their axes extending to the left and right. The two actuating rollers are respectively rotatably installed on the two groove walls of the V-shaped groove in the V-shaped support seat to support the oil pipe to be welded. The actuating rollers can be driven to rotate so as to drive the oil pipe to be welded to rotate.

[0029] Furthermore, a rotatable support roller is connected to the wall of the V-shaped groove in the V-shaped support base next to the actuating roller. The axis of the support roller is perpendicular to the axis of the actuating roller and parallel to the wall of the V-shaped groove where the support roller is located. The support roller is slidably mounted on the V-shaped support base in a direction perpendicular to the wall of the corresponding V-shaped groove. The V-shaped support base is also provided with a moving drive mechanism three for driving the support roller to move. The support roller can be driven to move higher or lower than the actuating roller.

[0030] By adopting the above technical solution, by setting up a support roller, the support roller supports the oil pipe before the two oil pipes are connected, which can reduce the friction between the oil pipe and the V-shaped support seat, making it easier for the oil pipe to move relative to the V-shaped support seat. When welding begins, the support roller descends so that the actuating roller can contact the oil pipe, making it easier to drive the oil pipe to rotate during the welding process.

[0031] The beneficial effects of the welding equipment for oil pipe processing provided by the present invention are: the present invention can form an X-shaped stacked weld between two oil pipes, which can reduce the problem of heat accumulation during the welding process, facilitate the formation of a finer and more uniform weld crystal structure, and at the same time, it can homogenize residual stress, eliminate harmful deformation, and improve the stability of the weldment.

[0032] The present invention also provides a manufacturing process using the above-mentioned welding equipment for oil pipe processing, the manufacturing process comprising the following steps:

[0033] S1. Place the two oil pipes to be welded on the positioning mechanism and drive the opposite ends of the two oil pipes to be coaxially connected together.

[0034] S2. Fix the circular track onto one of the oil pipes;

[0035] S3. Install the traveling vehicle on top of the circular track, fix the welding torch on the welding torch holder, and point the output end of the welding torch towards the welding bevel.

[0036] S4. Start the second walking drive structure and adjust the support position so that the driving direction of the third walking drive structure on the support is inclined to the first direction of the welding groove extension direction.

[0037] S5. Start the first and third walking drive structures and the welding torch to drive the walking vehicle to rotate one revolution relative to the top of the circular track on the circular track to complete one layer of welding.

[0038] S6. Start the second walking drive structure and adjust the support position so that the driving direction of the third walking drive structure on the support is symmetrical with the first direction about the plane of symmetry. Then repeat step S5 to complete the next layer of welding.

[0039] S7. Repeat steps S4-S6 to complete the filling welding of the weld bevel.

[0040] The beneficial effect of the manufacturing process provided by the present invention is that the performance of the oil pipe welded parts obtained by the above manufacturing process is more stable. Attached Figure Description

[0041] Figure 1 A three-dimensional structural schematic diagram of a welding device for oil pipe processing provided by the present invention;

[0042] Figure 2 A top view of a welding device for oil pipe processing provided by the present invention;

[0043] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0044] Figure 4A front view of a welding device for oil pipe processing provided by the present invention after removing one side of the movable seat;

[0045] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0046] Figure 6 A three-dimensional structural diagram of the positioning support in a welding equipment for oil pipe processing provided by the present invention;

[0047] Figure 7 Right view of a positioning support in a welding device for tubing processing provided by the present invention;

[0048] Figure 8 A right view of the annular track in a welding device for tubing processing provided by the present invention;

[0049] Figure 9 A three-dimensional structural diagram of the annular track and traveling vehicle in a welding equipment for tubing processing provided by the present invention;

[0050] Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point C;

[0051] Figure 11 A three-dimensional structural diagram of the semi-circular track, semi-circular connecting seat, and semi-circular fixing seat in a welding equipment for oil pipe processing provided by the present invention.

[0052] Figure 12 This is a simplified schematic diagram of the weld seam formed by a welding device for oil pipe processing provided by the present invention.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Frame; 101. Main frame; 102. Support frame; 2. Transmission screw one; 3. Guide rod one; 4. Positioning support; 401. Vertical plate; 402. Horizontal plate; 6. Moving seat; 601. Sliding hole; 7. Lifting cylinder; 8. V-shaped support seat; 801. Internal channel; 9. Actuating roller; 10. Supporting roller; 11. Semi-circular fixed seat; 12. Semi-circular connecting seat; 13. Semi-circular track; 131. Toothed hole; 14. Support plate; 16. Elastic element two; 17. Transmission belt assembly; 18. Drive block; 181. Pushing inclined surface; 19. Strip plate; 20. Transmission screw three; 21. Pressure rod; 22. Elastic element three; 23. Oil pipe; 24. Connecting rod 25. Connecting plate; 26. Movable seat; 27. Transmission screw II; 29. ​​Arc-shaped track; 30. Main body plate; 31. Side plate; 32. Rotary drive motor II; 33. Horizontal adjustment rod; 34. Lifting adjustment rod; 35. L-shaped rod; 36. Drive cylinder; 37. Clamping block; 38. Locking screw; 39. Guide rod II; 40. Base; 41. Sliding rod; 42. Guide rod III; 43. Movable block; 44. Traveling wheel; 45. Arc-shaped rack; 46. Gear II; 47. Rotary drive motor III; 48. Support; 49. Gear I; 50. Connecting track; 51. Matching track; 52. Semi-circular turning plate; 53. Guide rod; 54. Adjusting screw. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0056] The following is one embodiment of a welding device for tubing processing provided by the present invention:

[0057] like Figures 1-11 As shown, a welding device for oil pipe processing includes a frame 1, a positioning mechanism, a circular track, and a traveling vehicle.

[0058] like Figure 1 , Figure 2 As shown, the frame 1 is arranged on a horizontal ground. The frame 1 includes a main frame 101 extending to the left and right and two support bodies 102 symmetrically arranged on the front and rear sides of the main frame 101. The two support bodies 102 are located on the left side of the main frame 101.

[0059] The main frame 101 is equipped with a moving drive mechanism, which includes a transmission screw 2, two guide rods 3, two slides, and a moving drive motor. The transmission screw 2 extends in the left-right direction and is rotatably mounted on the main frame 101. The transmission screw 2 has two symmetrically arranged threaded sections with opposite directions of rotation. The two guide rods 3 are fixedly connected to the main frame 101 and extend in the left-right direction, symmetrically arranged on the front and rear sides of the transmission screw 2. The two slides are symmetrically arranged left-right and right, each slidingly fitted on the outside of the two guide rods 3, and respectively engaging with the two threaded sections on the transmission screw 2 in a helical transmission drive. The moving drive motor is fixedly mounted on the main frame 101 and is connected to the transmission screw 2 for driving the transmission screw 2 to rotate, thereby causing the two slides to move synchronously closer or further apart.

[0060] like Figure 1 , Figure 2 As shown, a second moving drive mechanism is provided between the two support bodies 102. The second moving drive mechanism includes a second transmission screw 27, two second guide rods 39, two second slides, and a second moving drive motor. The second transmission screw 27 extends in the front-to-back direction and is rotatably mounted on the two support bodies 102. The second transmission screw 27 has two threaded sections with opposite directions arranged symmetrically in the front-to-back direction. The two second guide rods 39 are fixedly connected between the two support bodies 102. The two second guide rods 39 extend in the front-to-back direction and are symmetrically arranged on the left and right sides of the second transmission screw 27. The two second slides are symmetrically arranged in the front-to-back direction and are slidably sleeved on the outside of the two second guide rods 39, and are respectively helically driven with the two threaded sections on the second transmission screw 27. The second moving drive motor is fixedly mounted on the support body 102 and is connected to the second transmission screw 27 for driving the second transmission screw 27 to rotate, so as to drive the two second slides to move closer or further apart synchronously. The aforementioned transmission screw 27 and guide rod 39 are both located below transmission screw 2 and guide rod 3.

[0061] Each slide table 2 is connected to a movable seat 6 above it. The movable seat 6 is L-shaped. The horizontal part of the movable seat 6 is fixedly connected to the slide table 2 by bolts. The vertical part of the movable seat 6 is provided with a vertically extending sliding hole 601. A movable seat 26 passes through the sliding hole 601. The movable seat 26 can slide up and down along the sliding hole 601. A semi-circular fixed seat 11 is provided on the side of the movable seat 26 facing the main frame 101. The axis of the semi-circular fixed seat 11 extends left and right, and the opening direction is along the front and back direction. Two connecting rods 24 are connected to the side of the semi-circular fixed seat 11 away from the main frame 101. A connecting plate 25 is connected to the side of the two connecting rods 24 away from the semi-circular fixed seat 11. The connecting plate 25 is fixedly connected to the movable seat 26 by bolts.

[0062] When the transmission screw 27 rotates, it can drive the two movable seats 6 to move closer to each other synchronously, and drive the two semi-annular fixed seats 11 to move towards each other until they abut to form a complete ring.

[0063] like Figure 11 As shown, the right side of the semi-circular fixed seat 11 is connected to a connecting rail 50 with an L-shaped cross-section.

[0064] like Figure 1 As shown, a lifting cylinder 7 is installed on the horizontal part of the movable seat 6. The drive output end of the lifting cylinder 7 is connected to the movable seat 26 and is used to drive the movable seat 26 to move in the vertical direction to adjust the height position of the semi-circular fixed seat 11.

[0065] The output end of the lifting cylinder 7 is also provided with an elastic element 2 16 that can extend and retract in the vertical direction, so that after the lifting cylinder 7 adjusts the position of the semi-circular fixed seat 11, the height of the semi-circular fixed seat 11 can still fluctuate up and down within a certain range, avoiding the semi-circular fixed seat 11 from not being able to keep coaxial with the oil pipe 23 due to the adjustment error of the lifting cylinder 7.

[0066] like Figure 11 As shown, one end of one of the semi-circular fixing seats 11 is fixedly connected to a guide rod 53, the end of which is tapered. The end of the other semi-circular fixing seat 11 is provided with a insertion groove corresponding to the guide rod 53. When the two semi-circular fixing seats 11 are spliced ​​together, the guide rod 53 is inserted into the insertion groove, so that the two semi-circular fixing seats 11 can be accurately spliced ​​into a ring.

[0067] The positioning mechanism includes two positioning supports 4 arranged symmetrically on the left and right sides. The two positioning supports 4 are respectively fixedly connected to the two slides 1 mentioned above by bolts.

[0068] like Figure 5 As shown, the positioning support 4 includes a horizontal plate 402 and a vertical plate 401 connected vertically. A V-shaped support 8 is fixedly connected to the horizontal plate 402 by bolts. The V-shaped support 8 has a V-shaped groove with an upward opening and extending in the left-right direction. An internal channel 801 is provided on the V-shaped support 8 below the two groove walls of the V-shaped groove, and a horizontally extending support plate 14 is also fixedly connected to the outer wall of the V-shaped support 8.

[0069] On the V-shaped support base 8, each of the two groove walls of the V-shaped opening is provided with a rotatable actuating roller 9 extending to the left and right. The two actuating rollers 9 are used to support the oil pipe 23 to be welded. The V-shaped support base 8 is also provided with a rotation drive mechanism, which includes a rotation drive motor and a transmission belt assembly 17. The rotation drive motor is fixedly mounted on the support plate 14. The rotation drive motor is connected to the actuating roller 9 near the rotation drive motor through the transmission belt assembly 17 to drive the actuating roller 9 to rotate.

[0070] Two support rollers 10 are provided on each groove wall of the V-shaped support seat 8. The two support rollers 10 are symmetrically arranged on the left and right sides of the actuating roller 9. The axis of the support roller 10 is perpendicular to the actuating roller 9 on the corresponding side and parallel to the groove wall of the V-shaped groove on the corresponding side.

[0071] like Figure 7 As shown, each support roller 10 is rotatably connected to a base 40. A square-section sliding rod 41 is connected to the bottom of the base 40. The sliding rod 41 slides along the V-shaped support 8 in a direction perpendicular to the corresponding side of the groove wall. The bottom end of the sliding rod 41 extends into the internal channel 801. The bottom ends of two sliding rods 41 located in the same internal channel 801 are fixedly connected to a horizontally extending strip plate 19. The surface of the strip plate 19 is parallel to the corresponding side of the groove wall. An elastic element is sleeved on the outside of the sliding rod 41. The elastic element is connected between the top inner wall of the internal channel 801 and the strip plate 19, applying a downward elastic force perpendicular to the strip plate 19.

[0072] The V-shaped support base 8 is also equipped with a moving drive mechanism three, which includes a transmission screw three 20, guide rods three 42, a drive block 18, and a moving drive motor three. The transmission screw three 20 extends in the front-to-back direction and rotatably passes through the middle of the V-shaped support base 8. The transmission screw three 20 passes through the internal channel 801 on the V-shaped support base 8. The transmission screw three 20 has two threaded sections with opposite directions of rotation. The two threaded sections are located in the two internal channels 801 on the V-shaped support base 8, respectively, and are symmetrically arranged. Two guide rods three 42 are fixedly connected in each internal channel 801. The two guide rods three 42 extend in the front-to-back direction and are symmetrically arranged on the left and right sides of the transmission screw three 20. Each internal channel 801 is equipped with a drive block 18. The drive block 18 has a pushing inclined surface 181 parallel to the strip plate 19. The drive block 18 is slidably fitted on the outside of the two guide rods three 42 and is helically driven in conjunction with the threaded sections on the transmission screw three 20.

[0073] The three-motor drive motor is fixedly mounted on the horizontal plate 402 and is connected to the three-screw drive 20. It drives the three-screw drive 20 to rotate, causing the two drive blocks 18 to move synchronously closer or further apart. When the two drive blocks 18 move synchronously closer, they push the strip plate 19, causing the support rollers 10 on both sides to move upwards. When the two drive blocks 18 move synchronously further apart, the support rollers 10 on both sides move downwards under the action of the elastic element. When the elastic element is in a free state, the support rollers 10 are lower than the actuating roller 9 in the direction perpendicular to the groove wall of the V-shaped groove on the corresponding side.

[0074] The sidewall of the vertical plate 401 facing the horizontal plate 402 is inclined from top to bottom away from the horizontal plate 402, with an inclination angle of 0.5°-1°. After the two oil pipes 23 are clamped by the vertical plates 401 on both sides and aligned with the main frame 101, the oil pipes 23 move down with the support roller 10 to press on the actuating roller 9. Since the sidewall of the vertical plate 401 that contacts the oil pipes 23 is a slightly inclined surface, after the oil pipes 23 move down, the two vertical plates 401 can slightly loosen the oil pipes 23. At this time, the two vertical plates 401 only have a limiting effect on the oil pipes 23 and will not hinder the subsequent rotation of the oil pipes 23. The actuating roller 9 can drive the oil pipes 23 to rotate more easily.

[0075] like Figure 1 , Figure 9 As shown, the annular track is coaxially fitted onto the outside of the oil pipe 23 to be welded. The annular track includes two relatively joined semi-annular tracks 13. The right side of each semi-annular track 13 has multiple toothed holes 131 evenly arranged around its axis. Figure 11 As shown, a semi-circular turning plate 52 with an L-shaped cross-section is provided on the left side of the semi-circular track 13. The vertical part of the semi-circular turning plate 52 is fixedly connected to the inner wall of the semi-circular track 13, and the left end of the semi-circular track 13 is located to the left of the vertical part of the semi-circular turning plate 52.

[0076] like Figure 8 , Figure 9 , Figure 11 As shown, a semi-circular connecting seat 12 is provided on the left side of the semi-circular turning plate 52. The semi-circular connecting seat 12 is coaxial with the semi-circular track 13 and the two ends are kept in correspondence. Three pressure rods 21 extending radially along the semi-circular connecting seat 12 are provided on the semi-circular connecting seat 12. The pressure rods 21 slide along the radial direction of the semi-circular connecting seat 12. A baffle is provided at the outer end of the pressure rod 21. An elastic element 3 22 is connected between the baffle and the semi-circular connecting seat 12. The elastic element 3 22 is sleeved on the outside of the pressure rod 21. The elastic element 3 22 applies an elastic force toward the center of the semi-circular connecting seat 12 to the pressure rod 21.

[0077] like Figure 11As shown, the left side of the semi-annular connecting seat 12 is connected to a mating track 51 with an L-shaped cross section. The mating track 51 is inserted into the connecting track 50, so that the semi-annular connecting seat 12 and the semi-annular fixed seat 11 maintain a relatively fixed axial position and can rotate relative to each other.

[0078] When the two semi-annular fixed seats 11 abut against each other to form a complete annular structure, the two semi-annular connecting seats 12 also move to abut against each other to form a complete annular structure. The bottom end of the pressure rod 21 in the semi-annular connecting seat 12 is elastically pressed against the oil pipe 23, so that the two semi-annular connecting seats 12 and the oil pipe 23 remain relatively fixed. At the same time, the two semi-annular tracks 13 are spliced ​​together to form a complete annular track, and the annular track also remains relatively fixed with the oil pipe 23 to be welded.

[0079] like Figure 3 , Figure 5 , Figure 10 As shown, the vehicle includes a main body plate 30 and two side plates 31 symmetrically connected to the left and right ends of the main body plate 30. A movable block 43 capable of sliding left and right is provided on the left side of the bottom of the main body plate 30. An adjusting screw 54 is rotatably connected to the movable block 43, extending in the left-right direction and spirally passing through the side plate 31 on the left side. By rotating the adjusting screw 54, the left-right position of the movable block 43 can be adjusted. Two traveling wheels 44 arranged at intervals front and back are rotatably connected to the bottom of the movable block 43, and the rotation axis of the traveling wheels 44 is perpendicular to the main body plate 30.

[0080] Two additional traveling wheels 44 are rotatably connected to the bottom right side of the main body plate 30, which are respectively opposite to the two traveling wheels 44 on the movable block 43. Each traveling wheel 44 has an annular groove with a U-shaped cross section. The four traveling wheels 44 are respectively locked on the left and right sides of the annular track through the annular groove, so that the traveling vehicle can be slidably installed on the annular track.

[0081] By turning the adjusting screw 54, the spacing between the two walking wheels 44 can be changed, making it easier to mount the four walking wheels 44 onto the outside of the circular track.

[0082] The traveling vehicle is equipped with a traveling drive structure, which includes a gear 49 and a rotary drive motor 32, such as... Figure 5 As shown, gear 49 is rotatably mounted on the traveling vehicle around a left-right extending axis of rotation. Gear 49 meshes with the annular track through a row of toothed holes 131. Rotational drive motor 32 is fixedly connected to the top of the main body plate 30. Rotational drive motor 32 is connected to gear 49 for transmission and is used to drive gear 49 to rotate. When gear 49 rotates, it meshes with the annular track through the toothed holes 131 and rolls on the annular track, thereby driving the traveling vehicle to move on the annular track.

[0083] like Figure 10 As shown, the top of the main body plate 30 is also provided with a horizontal adjustment assembly. The horizontal adjustment assembly includes a horizontal adjustment rod 33 extending in the left and right direction. The position of the horizontal adjustment rod 33 in the left and right direction is adjustable. The right end of the horizontal adjustment rod 33 is connected to a lifting adjustment assembly. The lifting adjustment assembly includes a vertically extending lifting adjustment rod 34. The position of the lifting adjustment rod 34 in the up and down direction is adjustable. The bottom end of the lifting adjustment rod 34 is connected to a horizontally arranged L-shaped rod 35. The first end of the L-shaped rod 35 is connected to the bottom end of the lifting adjustment rod 34, and the second end extends to the right side of the center position of the main body plate 30.

[0084] The position of the arc track 29 can be adjusted by adjusting the positions of the horizontal adjustment rod 33 and the lifting adjustment rod 34.

[0085] The second end of the L-shaped rod 35 is also connected to an arc-shaped track 29. The arc-shaped track 29 opens to the right. The plane perpendicular to the plane of the arc-shaped track 29 and bisecting the arc-shaped track 29 is defined as the plane of symmetry. The central axis of the circular track is located in the plane of symmetry.

[0086] A support 48 is provided on the arc-shaped track 29. The support 48 is slidably installed on the arc-shaped track 29 along its extension direction. The support 48 is provided with a second travel drive structure, which includes a second gear 46, an arc-shaped rack 45, and a third rotary drive motor 47. The second gear 46 is rotatably connected to the bottom of the support 48. The arc-shaped rack 45 is fixedly connected to the bottom of the arc-shaped track 29. The arc-shaped rack 45 is coaxial and corresponding with the arc-shaped track 29. The second gear 46 meshes with the arc-shaped rack 45. The third rotary drive motor 47 is fixedly installed on the support 48 and is connected to the second gear 46 for transmission. It is used to drive the second gear 46 to roll on the arc-shaped rack 45, thereby driving the support 48 to reciprocate on the arc-shaped track 29. The support 48 is also provided with a third walking drive structure, which includes a drive cylinder 36 connected to the top of the support 48 and has an output end that can extend and retract radially along the arc track 29.

[0087] The output end of the aforementioned drive cylinder 36 is connected to a welding torch holder. The welding torch holder includes two clamping blocks 37 hinged to the output end of the drive cylinder 36. The two clamping blocks 37 are arranged symmetrically. A clamping groove is provided on one side of the two clamping blocks 37. The clamping groove is arranged inclined from top to bottom toward the side where the welding bevel is located. A locking screw 38 is also passed through the two clamping blocks 37.

[0088] A welding torch is clamped between two clamping grooves. In use, the handle of the welding torch is placed in the clamping groove between the two clamping blocks 37, and the locking screw 38 is turned to bring the two clamping blocks 37 closer together, clamping the welding torch between the two clamping blocks 37 to fix the welding torch. After the welding torch is fixed between the two clamping blocks 37, the output end of the welding torch tilts downwards and points to the center normal of the arc track 29. By adjusting the horizontal adjustment rod 33 and the lifting adjustment rod 34, the center normal of the arc track 29 can be adjusted to be located in the mating plane of the two oil pipes 23, thereby ensuring that the output end of the welding torch points to both the center normal of the arc track 29 and the welding bevel. At this time, when the support 48 moves back and forth on the arc track 29, the output end of the welding torch always points to the same point.

[0089] The present invention also provides a manufacturing process for manufacturing an oil pipe 23 of a certain length, the manufacturing process being implemented using the aforementioned welding equipment for oil pipe processing.

[0090] The manufacturing process provided by this invention includes the following steps:

[0091] S1. Place the two oil pipes 23 to be welded on the two V-shaped support seats 8 respectively, so that the oil pipes 23 contact and are supported by the support rollers 10 on the V-shaped support seats 8. Start the moving drive mechanism one to drive the two positioning supports 4 to move closer to each other, and drive the two oil pipes 23 to be welded to move closer to each other, so that the opposite ends of the two oil pipes 23 abut against each other, and make the two vertical plates 401 contact the oil pipes 23 to clamp the two oil pipes 23. The welding bevel formed by the butt joint of the two oil pipes 23 moves to be aligned with the main frame 101.

[0092] S2. Start the third moving drive mechanism to drive each support roller 10 to move down. The oil pipe 23 moves down under the action of gravity until it contacts the actuating roller 9 and is supported by the actuating roller 9. The two vertical plates 401 slightly loosen the two oil pipes 23.

[0093] S3. Start the lifting cylinder 7 to adjust the height of the semi-annular fixed seat 11 so that the semi-annular fixed seat 11 and the oil pipe 23 to be welded are coaxial. Start the second moving drive mechanism to drive the two moving seats 6 to move closer to each other, and drive the two semi-annular fixed seats 11 to move closer to each other and splice into a complete ring structure and sleeve it on the outside of the oil pipe 23. The pressure rod 21 on the semi-annular connecting seat 12 presses against the oil pipe 23. The two semi-annular connecting seats 12 and the two semi-annular tracks 13 are all spliced ​​into a ring structure and fixed on the oil pipe 23.

[0094] S4. Install the traveling vehicle on the top of the circular track, install the welding torch in the welding torch mounting base, adjust the horizontal adjustment component and the lifting adjustment component so that the center normal of the arc track 29 is located in the welding groove, and the output end of the welding torch points to both the welding groove and the center normal of the arc track 29. Start the rotation drive motor 3 47 and adjust the position of the support 48 so that the extension and retraction direction of the output end of the drive cylinder 36 forms an acute angle with the extension direction of the welding groove.

[0095] S5. Start the drive motor 32 and turn on the welding torch. The traveling vehicle moves slowly and uniformly clockwise 90 degrees from the top of the circular track. During this time, the drive cylinder 36 drives the welding torch to move back and forth, forming a groove within the welding bevel. Figure 12 The first weld bead a, which slopes from the upper left to the lower right along the width of the weld bevel, is shown.

[0096] S6. After the traveling vehicle travels 90 degrees on the circular track, the rotation drive mechanism one is started. The agitator roller 9 drives the oil pipe 23 to rotate counterclockwise at a speed greater than the traveling vehicle's speed relative to the circular track. When the oil pipe 23 rotates to the point where the traveling vehicle is once again at the top of the oil pipe 23, the drive to rotate the oil pipe 23 is stopped. During the clockwise rotation of the oil pipe 23, the traveling vehicle continues to travel relative to the circular track, and the welding process of the welding torch is not interrupted. This process is repeated. After the traveling vehicle has traveled one revolution relative to the circular track, one layer of welding is completed.

[0097] S7. Start the rotation drive motor 347, which drives the support 48 to rotate on the arc track 29 to a position that is symmetrical about the plane of symmetry with respect to the previous position, and the weld direction changes as follows. Figure 12 The second weld bead b intersects with the weld bead of the previous layer, and the traveling vehicle continues to travel on the circular track to complete the next layer of welding;

[0098] S8. Repeat steps S4-S7 above to fill the weld bevel and connect the two oil pipes 23.

Claims

1. A manufacturing process using a welding equipment for oil pipe processing, the welding equipment for oil pipe processing including a frame, the frame being provided with a positioning mechanism for keeping two oil pipes to be welded coaxially aligned, characterized in that... Also includes: A circular track, with its axis extending to the left and right, is used to secure the outer side of one of the oil pipes. The traveling vehicle is slidably installed on the circular track along the extension direction of the circular track, and a traveling drive structure is provided between the traveling vehicle and the circular track to drive the traveling vehicle to move on the circular track. An arc-shaped track is connected to the traveling vehicle. The plane containing the arc-shaped guide line of the arc-shaped track is perpendicular to the radius of the oil pipe to be welded, and the arc-shaped opening of the arc-shaped track faces the welding bevel between the two oil pipes. The plane that is perpendicular to the plane containing the arc-shaped guide line of the arc-shaped track and bisects the arc-shaped track is defined as the plane of symmetry. The central axis of the oil pipe to be welded is located in the plane of symmetry, and the central normal of the arc-shaped track is located in the mating plane of the two oil pipes to be welded. The support is installed on the arc track and can move circumferentially along the arc track. A second travel drive structure is provided between the arc track and the support. The second travel drive structure is used to drive the support to move back and forth on the arc track. A welding torch holder is mounted on a support and is capable of moving radially along an arc-shaped track. The support is provided with a travel drive structure three for driving the welding torch holder to move radially back and forth along the arc-shaped track. The welding torch is installed in the welding torch holder, with the output end of the welding torch located within the center normal of the arc track and pointing towards the welding bevel. The manufacturing process includes the following steps: S1. Place the two oil pipes to be welded on the positioning mechanism and drive the opposite ends of the two oil pipes to be coaxially connected together. S2. Fix the circular track onto one of the oil pipes; S3. Install the traveling vehicle on top of the circular track, fix the welding torch on the welding torch holder, and point the output end of the welding torch towards the welding bevel. S4. Start the second walking drive structure and adjust the support position so that the driving direction of the third walking drive structure on the support is inclined to the first direction of the welding groove extension direction. S5. Start the first and third walking drive structures and the welding torch to drive the walking vehicle to rotate one revolution relative to the top of the circular track on the circular track to complete one layer of welding. S6. Start the second walking drive structure and adjust the support position so that the driving direction of the third walking drive structure on the support is symmetrical with the first direction about the plane of symmetry. Then repeat step S5 to complete the next layer of welding. S7. Repeat steps S4-S6 to complete the filling welding of the weld bevel.

2. The manufacturing process according to claim 1, characterized in that, The circular track has multiple toothed holes evenly arranged around its axis. The walking drive structure includes a gear 1 that is rotatably connected to the walking vehicle around a rotating axis extending to the left and right. The gear 1 meshes with the circular track through the toothed holes. When the gear 1 is driven to rotate, it meshes with the circular track through the toothed holes, thereby driving the walking vehicle to move on the circular track.

3. A manufacturing process according to claim 1 or 2, characterized in that, The second walking drive structure includes an arc rack coaxially connected to the arc track, a gear two rotatably connected to the support, and a rotary drive motor three connected to the support for driving the gear two to rotate. The gear two meshes with the arc rack, and the rotary drive motor three drives the gear two to rotate, so as to drive the support to reciprocate along the extension direction of the arc track.

4. The manufacturing process according to claim 1, characterized in that, The annular track includes two semi-annular tracks that are spliced ​​together. One side of each semi-annular track is coaxial and connected to a corresponding semi-annular connecting seat. The semi-annular connecting seat is provided with multiple pressure rods evenly arranged around the central axis. The pressure rods extend radially along the semi-annular connecting seat and slide on the semi-annular connecting seat in the radial direction. Between the pressure rods and the semi-annular connecting seat, there is an elastic element three that can extend radially along the semi-annular connecting seat. When the two semi-annular connecting seats are spliced ​​together, each elastic element three is compressed and applies an elastic force toward the center of the semi-annular connecting seat to the pressure rod, so that the pressure rod is pressed against the outer wall of the oil pipe.

5. The manufacturing process according to claim 4, characterized in that, The frame is equipped with two movable seats symmetrically arranged on both sides of the central axis of the oil pipe to be welded. Each movable seat can slide in the front-back direction. Each movable seat is equipped with a semi-circular fixed seat. The two semi-circular fixed seats are symmetrically arranged front-back with their openings facing each other. The frame is equipped with a second movable drive mechanism, which is connected to the two movable seats for driving the two movable seats to move closer to each other synchronously, so as to drive the two semi-circular fixed seats to move closer to each other and abut against each other. The two semi-circular fixed seats are coaxially connected to the side of the two semi-circular connecting seats opposite to the semi-circular track. The semi-circular connecting seats and the semi-circular fixed seats maintain a relatively fixed axial position, and the semi-circular connecting seats can rotate relative to the semi-circular fixed seats. The frame is also equipped with a first rotation drive mechanism for driving the oil pipe to be welded to rotate.

6. The manufacturing process according to claim 5, characterized in that, The positioning mechanism includes two positioning supports arranged symmetrically on the left and right. Both positioning supports are slidably mounted on the frame in the left and right direction. The positioning supports include a horizontal plate and a vertical plate. The horizontal plate is provided with a V-shaped support for supporting the oil pipe to be welded. The frame is also provided with a moving drive mechanism for driving the two positioning supports to move closer to each other synchronously. When the two positioning supports move closer to each other synchronously, they can drive the two oil pipes to be welded to be coaxially spliced ​​together.

7. The manufacturing process according to claim 6, characterized in that, The semi-circular fixed seat is slidably mounted on the movable seat in the vertical direction. The movable seat is equipped with a lifting mechanism that is connected to the semi-circular fixed seat to adjust the height of the semi-circular fixed seat.

8. The manufacturing process according to claim 7, characterized in that, Each of the two V-shaped support seats is equipped with a set of rotation drive mechanism one. The rotation drive mechanism one includes two actuating rollers with their axes extending to the left and right. The two actuating rollers are respectively rotatably installed on the two groove walls of the V-shaped groove in the V-shaped support seat to support the oil pipe to be welded. The actuating rollers can be driven to rotate so as to drive the oil pipe to be welded to rotate.

9. A manufacturing process according to claim 8, characterized in that, A rotatable support roller is connected to the wall of the V-shaped groove in the V-shaped support base, next to the actuating roller. The axis of the support roller is perpendicular to the axis of the actuating roller and parallel to the wall of the V-shaped groove where the support roller is located. The support roller is slidably mounted on the V-shaped support base in a direction perpendicular to the wall of the corresponding V-shaped groove. The V-shaped support base is also provided with a moving drive mechanism three for driving the support roller to move. The support roller can be driven to move higher or lower than the actuating roller.

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