A double-sided submerged arc welding spiral pipe longitudinal multi-wire inner welding device

Abstract

The application discloses a double-sided submerged arc welding spiral pipe longitudinal multi-wire inner welding device and relates to the technical field of spiral pipe submerged arc welding. The device comprises upper and lower symmetrical mounting plates, support frames welded to the left and right ends of the upper and lower symmetrical mounting plates, telescopic air cylinders fixedly connected to the inner sides of the support frames through bolts, fixed frames arranged at the middle parts of the upper and lower symmetrical mounting plates, guide moving units fixedly connected to the left and right sides of the fixed frames and overturning units fixedly connected to the middle parts of the fixed frames. The sliding column and the sliding sleeve are telescopically matched to adapt to different pipe diameters. The first pulley abuts against the inner wall of the spiral pipe to provide radial support. The second pulley is axially limited along the second sliding groove of the second guide carriage. The running tracks of all the welding guns are synchronous and have no deviation. The device can automatically and continuously walk along the spiral welding seam in the whole process without real-time correction and is suitable for inner welding operation of spiral pipes with various inner diameters.

Description

Technical Field

[0001] This invention relates to the field of submerged arc welding technology for spiral tubes, and in particular to a double-sided submerged arc welding device for longitudinal multi-wire internal welding of spiral tubes. Background Technology

[0002] Spiral steel pipe production commonly employs double-sided submerged arc welding. The quality of the weld formation inside the pipe directly determines the pressure-bearing performance of the pipe. Traditional internal welding equipment is mostly a single-wire, single-welding-torch structure, which can only complete a single weld deposition in a single welding operation, resulting in low welding deposition efficiency and long production cycles. The few existing multi-wire internal welding devices lack a unified synchronous guiding structure, with multiple welding torches independently adjusted and supported. During the pipe's movement, problems such as single-torch deviation and welding wire trajectory misalignment easily occur. Furthermore, the radial support of the equipment lacks an elastic compensation structure, and due to the influence of the spiral pipe's inner diameter tolerance and assembly gaps, significant vibration occurs during operation. The welding wires cannot continuously adhere to the spiral weld, easily producing defects such as porosity, incomplete fusion, and uneven weld width, resulting in a high rate of finished product rework.

[0003] Existing multi-wire internal welding equipment uses an independent fine-tuning method for adjusting the welding torch angle, which cannot simultaneously and uniformly adjust the posture of all welding torches. When welding seams on different curved surfaces around the circumference of spiral pipes, it is difficult to maintain consistent tilt angles for each welding torch. At the same time, the positioning of the welding torch spacing relies on bolt locking, which is cumbersome to disassemble and adjust, and is prone to displacement under welding vibration. In addition, traditional equipment relies on a single pipe wall support for guidance and lacks an axial track limiting structure. When combined with a reciprocating welding mechanism, the overall stability is poor, making it difficult to achieve multi-layer, multi-pass synchronous reciprocating submerged arc operation, and failing to meet the dual requirements of high-capacity production and high-precision weld formation. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device to solve the problems in the above-mentioned technical solutions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device, comprising mounting plates symmetrically arranged at the top and bottom, with the left and right ends of the mounting plates welded to a support frame, and telescopic cylinders fixedly connected to the inner side of each support frame by bolts; a fixing frame is provided in the middle of the mounting plates symmetrically arranged at the top and bottom, with the telescopic ends of the telescopic cylinders fixedly connected to the middle of the left and right ends of the fixing frame; guide moving units are fixedly connected to the left and right sides of the fixing frame; a flipping unit is fixedly connected to the middle of the fixing frame; a positioning unit is flipped on the flipping unit; and several welding units are provided on the positioning unit.

[0006] The flipping unit includes first fixing members symmetrically arranged on the left and right sides. The first fixing members are respectively fixedly connected to the upper left and right sides of the fixing frame. The bottom of each of the first fixing members is welded with an annular guide rail. The inner circle of the annular guide rail is provided with an annular groove. A guide rail robot is arranged to move in annularly within the annular groove. The outer side of the guide rail robot is fixedly connected with a connecting plate by bolts.

[0007] The positioning unit includes a first guide carriage.

[0008] Furthermore, each of the guide moving units includes a mounting column, which is welded to the left and right ends of the fixed frame. The upper and lower parts of the mounting column are fixedly connected to a sleeve. Support rods are welded to the front and rear ends of the sleeves. Sliding sleeves are welded to the ends of the support rods. Sliding columns are slidably connected to the inside of each sliding sleeve. A first connecting piece is welded to the outer end of each sliding column. A first pulley is fixedly connected to the front end of each first connecting piece by bolts. A second pulley is fixedly connected to the inner side of each first connecting piece by bolts.

[0009] Through the above scheme, the sliding column can freely extend and retract within the sliding sleeve, quickly changing the radial extension dimension of the first pulley to adapt to spiral tubes with different inner diameter specifications; the first pulley fits against the inner wall of the spiral tube to form radial support positioning, and the second pulley cooperates with the second guide carriage to construct an axial limiting track, providing a stable and unified walking benchmark for the entire welding mechanism, ensuring that the travel trajectories of multiple welding guns are synchronized and do not deviate.

[0010] Furthermore, each of the support rods is provided with a sliding sleeve, each of the second pulleys is slidably provided with a sliding plate, each of the sliding plates is welded with a fixing post on its inner side, the other end of each fixing post is welded to the outer side of the first connector, and each fixing post is fitted with a spring on its outer side.

[0011] Through the above scheme, the spring continuously applies an outward elastic preload to the sliding plate and the second pulley, which can automatically compensate for the dimensional deviation caused by the pipe inner diameter tolerance and assembly gap, so that the second pulley is always in close contact with the inner wall of the second sliding groove, eliminating the problem of vibration and jamming during operation, and enabling the equipment to move smoothly and continuously in contact with the spiral weld seam throughout the process, avoiding welding defects caused by misalignment of the welding wire trajectory.

[0012] Furthermore, each welding unit includes a second fixing member and a second connecting member. The bottom end of the second fixing member is fixedly connected to a matching slider on both the front and rear sides by bolts. The bottom end of the matching slider is fixedly connected to the upper part of the second connecting member. A welding gun is provided at the bottom of each second connecting member.

[0013] Through the above scheme, multiple independent welding units can slide freely on the guide carriage by relying on the matching slider, and flexibly adjust the longitudinal arrangement spacing of each welding gun to achieve a multi-wire arrangement in the longitudinal row; the modular welding gun structure is easy to disassemble and assemble, and the number of welding guns can be increased or decreased according to the welding weld width and weld depth process requirements, and it is suitable for multi-layer and multi-pass submerged arc welding operations.

[0014] Furthermore, the first guide slide is provided with a first sliding groove on both the front and rear sides, and the inner side of the engaging slider is fixedly connected to a third pulley by bolts. The inner side of the engaging slider is slidably connected to the outer side of the corresponding first sliding groove, and the third pulley is rotatably connected to the groove provided inside the first sliding groove.

[0015] With the above scheme, the third pulley uses rolling friction instead of traditional sliding friction, which greatly reduces the resistance to adjusting the welding gun spacing and ensures smooth sliding. At the same time, the first sliding groove forms a two-way limiting constraint on the matching slider, restricting the welding gun from moving up and down and back and forth, ensuring that the relative positions of multiple welding guns are stable after adjustment, and that the running trajectory of each welding wire remains uniform.

[0016] Furthermore, the upper part of the first guide carriage is provided with a central groove, and the bottom of the second fixing member is fixedly connected to an electromagnetic device by bolts. The shape of the electromagnetic device is consistent with the shape of the central groove, and the bottom of the electromagnetic device is slidably connected inside the central groove.

[0017] With the above solution, after the welding torch spacing is adjusted, the electromagnetic device is energized to generate a magnetic attraction effect, which tightly attracts and locks all welding units with the central groove, eliminating the need for manual tightening of bolts and making the operation highly efficient. The electromagnetic locking structure can resist continuous vibration during the welding process, prevent the welding torch from slipping and misaligning, and ensure that the weld width is uniform.

[0018] Furthermore, the support frame is fixedly connected to the middle of both the front and rear ends with a second guide slide. The upper and lower parts of the second guide slide are provided with a second sliding groove. The second pulley is tactilely connected to the inner side of the corresponding second sliding groove, and the first pulley is tactilely connected to the inner end face of the spiral tube.

[0019] Through the above scheme, the first pulley provides radial support to the pipe wall, and the second pulley cooperates with the second sliding groove to form an axial track limit, thus forming a dual radial and axial guiding constraint structure. The whole machine moves along the spiral pipe without deviation or shaking, and all welding torches follow the spiral weld seam automatically and continuously without the need for real-time correction.

[0020] Furthermore, the left and right ends of the first guide carriage are both fixedly connected to side plates by bolts, and the upper part of the side plates is fixedly connected to the corresponding connecting plates by bolts.

[0021] Through the above scheme, the side plate achieves a rigid integrated connection between the positioning unit and the flipping unit. The circular rotation power of the guide rail robot can be completely transmitted to the first guide carriage, driving all the welding guns on the carriage to synchronously rotate and adjust their angles in a circular manner. This uniformly adjusts the tilt posture of all welding wires relative to the weld, avoiding welding defects such as undercut and lack of fusion caused by inconsistent angles of a single gun.

[0022] In summary, the present invention provides a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device, which has the following beneficial effects:

[0023] 1. This invention adapts to different pipe diameters by using a sliding column and sliding sleeve for telescopic coordination. The first pulley is radially supported against the inner wall of the spiral pipe, while the second pulley is axially limited along the second sliding groove of the second guide slide. Simultaneously, the spring and sliding plate continuously elastically pre-tighten to compensate for the gap, and are linked with the movement of the welding mobile vehicle of the whole machine. This provides a unified operating benchmark for the positioning unit and all welding units. All welding torches move synchronously without deviation, and can automatically follow the spiral weld seam continuously without real-time correction. It is suitable for welding operations of spiral pipes with various inner diameters. The guide robot rotates in a ring along the annular groove of the ring guide rail. The power is completely transmitted to the first guide slide through the connecting plate and side plate, which drives all welding units on the slide to synchronously rotate and adjust their angles in a ring. This allows the entire set of welding torches to synchronously change the tilt angle relative to the weld seam, uniformly adapting to different curved surfaces and different welding penetration requirements of the spiral pipe circumference. The posture of each welding wire remains consistent, avoiding welding defects such as undercut and incomplete fusion caused by single torch angle deviation, and greatly improving the uniformity of the entire weld seam formation.

[0024] 2. This invention utilizes a sliding block paired with a third pulley to slide along the first sliding groove of the first guide slide with low resistance, allowing for free adjustment of the longitudinal spacing of multiple welding torches. After the spacing is adjusted, the electromagnetic device adsorbs and engages with the central groove, simultaneously locking all welding units. The sliding adjustment and electromagnetic locking work in tandem, enabling rapid switching of multi-wire arrangement processes and preventing welding torch displacement caused by welding vibration. This allows for rapid switching of different weld widths and depths in multi-wire submerged arc welding. The reciprocating feed of the fixed frame is achieved by pushing and pulling the telescopic cylinder. The guide moving units on both sides of the fixed frame, in conjunction with the second guide slide, form a double guide constraint, driving the flipping unit, positioning unit, and multiple welding torches to move synchronously back and forth. Combined with the continuous forward movement of the welding carriage along the pipe axis, multi-wire, multi-layer, and multi-pass continuous submerged arc welding is completed in one go, significantly shortening the processing time of internal welding of a single spiral pipe. The synchronous multi-wire welding effectively improves the weld deposition efficiency. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention;

[0026] Figure 2This is a schematic diagram of the fixed frame, guide moving unit, and second guide slide structure of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention.

[0027] Figure 3 The image shows a right view of the fixed frame, guide moving unit, and second guide slide of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention.

[0028] Figure 4 This is a three-dimensional structural diagram of the guide moving unit of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention;

[0029] Figure 5 This is a three-dimensional structural diagram of the flipping unit, positioning unit, and welding unit of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention.

[0030] Figure 6 This is a schematic diagram of the flipping unit structure of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention;

[0031] Figure 7 This is a schematic diagram of the welding unit structure of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention;

[0032] Figure 8 This is a schematic diagram of the mounting plate, support frame, and second guide carriage structure of a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Mounting plate; 2. Support frame; 3. Telescopic cylinder; 4. Fixing frame; 5. Guide moving unit; 501. Mounting column; 502. Sleeve; 503. Support rod; 504. Sliding sleeve; 505. Sliding column; 506. First connecting piece; 507. First pulley; 508. Second pulley; 509. Sliding sleeve; 510. Sliding plate; 511. Fixing column; 512. Spring; 6. Tilting unit; 601. First fixing piece; 602. Ring 603. Guide rail; 604. Annular groove; 605. Guide rail robot; 606. Connecting plate; 7. Positioning unit; 701. First guide slide; 702. Side plate; 703. First sliding groove; 704. Central groove; 8. Welding unit; 801. Second fixing member; 802. Fitting slider; 803. Second connecting member; 804. Welding torch; 805. Third pulley; 806. Electromagnetic device; 9. Second guide slide; 901. Second sliding groove. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example:

[0037] Please see Figures 1-8 As shown, the present invention provides a technical solution: a double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device, including an upper and lower symmetrically arranged mounting plate 1, the left and right ends of the upper and lower symmetrically arranged mounting plate 1 are welded to a support frame 2, the inner side of the support frame 2 is fixedly connected to a telescopic cylinder 3 by bolts, a fixed frame 4 is arranged in the middle of the upper and lower symmetrically arranged mounting plate 1, the telescopic ends of the telescopic cylinder 3 are respectively fixedly connected to the middle of the left and right ends of the fixed frame 4, a guide moving unit 5 is fixedly connected to the left and right sides of the fixed frame 4, a flipping unit 6 is fixedly connected to the middle of the fixed frame 4, a positioning unit 7 is flipped on the flipping unit 6, and a plurality of welding units 8 are arranged on the positioning unit 7;

[0038] The flipping unit 6 includes first fixing members 601 symmetrically arranged on the left and right sides. The first fixing members 601 are fixedly connected to the upper left and right sides of the fixing frame 4 respectively. The bottom of each first fixing member 601 is welded with an annular guide rail 602. The inner circle of the annular guide rail 602 is provided with an annular groove 603. The guide rail robot 604 is arranged in annular movement within the annular groove 603. The outer side of the guide rail robot 604 is fixedly connected with a connecting plate 605 by bolts. The annular guide rail 602 and the annular groove 603 provide an annular rotation track for the guide rail robot 604. The guide rail robot 604 can drive the connecting plate 605 to rotate synchronously, so as to realize the unified adjustment of the overall annular posture of the positioning unit 7 and the synchronous adjustment of the angle of all welding guns 804 to ensure the consistency of the angle of multiple welding wires and adapt to the welding requirements of different weld seam positions on the circumference of the spiral tube.

[0039] The positioning unit 7 includes a first guide carriage 701.

[0040] Each guide moving unit 5 includes a mounting column 501, which is welded to the left and right ends of the fixed frame 4. A sleeve 502 is fixedly connected to the upper and lower parts of the mounting column 501. Support rods 503 are welded to the front and rear ends of the sleeves 502. Sliding sleeves 504 are welded to the ends of the support rods 503. Sliding columns 505 are slidably connected to the inside of each sliding sleeve 504. A first connecting piece 506 is welded to the outer end of each sliding column 505. A first pulley 507 is bolted to the front end of each first connecting piece 506. A second pulley 508 is bolted to the inner side of each first connecting piece 506. The sliding column 505 can extend and retract within the sliding sleeve 504 to adapt to spiral tubes of different inner diameters. The first pulley 507 rolls against the inner wall of the spiral tube to provide radial support within the tube. The second pulley 508 cooperates with the second guide slide 9 to form a double guide limit. The entire device moves without radial sway, providing a stable and synchronous operating reference for the multi-welding gun 804.

[0041] Each support rod 503 is equipped with a sliding sleeve 509, and each second pulley 508 is slidably equipped with a sliding plate 510. A fixing post 511 is welded to the inner side of each sliding plate 510, and the other end of each fixing post 511 is welded to the outer side of the first connector 506. A spring 512 is sleeved on the outer side of each fixing post 511. The spring 512 continuously applies elastic preload to the second pulley 508 through the sliding plate 510, automatically compensating for assembly gaps and pipe size deviations, ensuring that the second pulley 508 always fits the second sliding groove 901, eliminating running jams and gap vibrations, and ensuring that the multi-welding gun 804 continuously and smoothly follows the weld seam trajectory automatically.

[0042] Each welding unit 8 includes a second fixing member 801 and a second connecting member 803. The bottom end of the second fixing member 801 is fixedly connected to the front and rear sides by bolts with a matching slider 802. The bottom end of the matching slider 802 is fixedly connected to the upper part of the second connecting member 803. The bottom of the second connecting member 803 is provided with a welding gun 804. Multiple independent welding units 8 can slide freely on the first guide slide 701 to adjust the spacing and realize the arrangement of multiple wires in the longitudinal row. The matching slider 802 slides smoothly with the slide and can flexibly adjust the relative position of each welding gun 804 to adapt to the different welding process requirements for penetration depth and penetration width.

[0043] The first guide slide 701 has a first sliding groove 703 on both the front and rear sides. The inner side of the engaging slider 802 is fixedly connected to a third pulley 805 by bolts. The inner side of the engaging slider 802 is slidably connected to the outer side of the corresponding first sliding groove 703, and the third pulley 805 is slidably connected to the groove provided inside the first sliding groove 703. The third pulley 805 rolls in the first sliding groove 703, which greatly reduces the sliding resistance of the welding unit 8 when adjusting left and right, and the sliding is smooth without jamming. At the same time, it forms a bidirectional limit on the engaging slider 802 to prevent the welding gun 804 from shifting up and down or forward and backward, and ensures that the trajectory of each welding wire is uniform and stable.

[0044] The upper part of the first guide slide 701 is provided with a central groove 704. The bottom of the second fixing member 801 is fixedly connected to an electromagnetic device 806 by bolts. The shape of the electromagnetic device 806 matches the shape of the central groove 704, and the bottom of the electromagnetic device 806 is slidably connected inside the central groove 704. The electromagnetic device 806 and the central groove 704 magnetically cooperate. After the spacing of the welding torch 804 is adjusted, all welding units 8 are quickly locked. There is no slippage or shaking during the welding process, which ensures that the spacing and angle of the multiple welding torches 804 relative to the weld is constant, and improves the uniformity of weld formation.

[0045] The support frame 2 is fixedly connected to the middle of the front and rear ends of the second guide slide 9. The upper and lower parts of the second guide slide 9 are provided with second sliding grooves 901. The second pulley 508 is rolled on the inner side of the corresponding second sliding groove 901. The first pulley 507 is rolled on the inner end face of the spiral tube. The second guide slide 9 and the second sliding groove 901 cooperate with the second pulley 508 to form an axial guide track. With the support of the tube wall of the first pulley 507, a double guide structure is formed inside and outside. When the device moves along the axial direction of the spiral tube, it simultaneously constrains all welding guns 804, so that multiple welding wires can automatically follow the spiral weld seam and move continuously.

[0046] The left and right ends of the first guide slide 701 are fixedly connected to the side plates 702 by bolts. The upper part of the side plates 702 is fixedly connected to the corresponding connecting plates 605 by bolts. The side plates 702 realize the rigid connection between the positioning unit 7 and the flipping unit 6. The rotation power of the guide robot 604 can be completely transmitted to the first guide slide 701, driving all welding units 8 to flip and adjust their posture synchronously, realizing the uniform adjustment of the posture of all welding wires and reducing welding defects.

[0047] Please see Figures 1-8As shown, the working principle is as follows: First, according to the internal diameter specification of the spiral tube to be processed, the front and rear extension of the sliding column 505 inside the sliding sleeve 504 is adjusted, which drives the first connecting piece 506 and the first pulley 507 to expand outward or retract inward simultaneously, ensuring that the first pulley 507 rolls tightly against the inner end face of the spiral tube. At the same time, according to the assembly position of the second pulley 508, the installation and fixing position of the second guide slide 9 at the front and rear ends of the support frame 2 is adjusted, so that the second pulley 508 can be accurately embedded in the second sliding groove 901 and roll smoothly. During the operation, the outer side of the support rod 503 is equipped with the sliding sleeve 509, and the outer side of the fixed column 511 is equipped with the spring 512 and the sliding plate 510 to continuously apply elastic clamping force to the second pulley 508, eliminating the assembly gap and forming radial limiting support for the entire device throughout the process.

[0048] Then, the entire double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device is assembled onto the welding mobile vehicle. The welding mobile vehicle drives into the spiral pipe and moves at a constant speed along the spiral weld axis of the pipe body. Relying on the double constraint structure of the guide moving unit 5, the pipe wall, and the second guide slide 9, the positioning unit 7 and multiple welding units 8 move automatically and synchronously following the spiral trajectory of the pipe body, so that multiple welding guns 804 move synchronously and synchronously following the spiral weld.

[0049] Secondly, considering the welding requirements of different points and curvatures around the spiral weld seam, the guide robot 604 is activated to move in a circular motion along the annular groove 603 within the annular guide rail 602. The guide robot 604, through the connecting plate 605 and side plate 702, drives the first guide slide 701 to rotate synchronously in a circular motion, uniformly adjusting the positioning unit 7 and all welding units 8 in a circular orientation. This completes the overall posture adjustment of all welding torches 804 in one go. Simultaneously, based on different pipe wall thicknesses, welding penetration depths, and weld widths, multiple welding torches are uniformly adjusted. The arrangement spacing of unit 8 on the first guide slide 701 matches the smooth sliding of slider 802 along the outside of the first sliding groove 703. The third pulley 805 rolls in the inner groove of the first sliding groove 703 to reduce sliding resistance and precisely adjust the longitudinal arrangement spacing between multiple welding guns 804. After the spacing is adjusted, the electromagnetic device 806 is activated. The electromagnetic adsorption force is used to make the electromagnetic device 806 engage and fix in the center groove 704, and simultaneously lock the relative positions of all second fixing parts 801, second connecting parts 803 and welding guns 804.

[0050] Further activate the telescopic cylinders 3 on both sides. The output end of the telescopic cylinders 3 pushes and pulls the fixed frame 4 to move back and forth as a whole. The guide moving units 5 on both sides of the fixed frame 4 rely on the second pulley 508 and the second sliding groove 901, and the first pulley 507 and the inner wall of the spiral tube to form a double synchronous guide limit, which drives the flipping unit 6, the positioning unit 7, and all welding units 8 to move back and forth synchronously and smoothly. In conjunction with the axial movement of the welding moving vehicle, the spiral weld seam is realized to achieve multi-layer and multi-pass synchronous reciprocating submerged arc welding. During continuous welding operations, if the local curvature of the weld seam changes or the depth and width of the weld need to be dynamically fine-tuned, the guide rail robot 604 can be controlled to rotate synchronously in a small range along the annular groove 603 in real time, which will drive the positioning unit 7 and all welding units 8 to flip synchronously and adjust the tilt angle of all welding guns 804 relative to the spiral weld seam synchronously.

[0051] After all the welding operations of the single spiral pipe are completed, the electromagnetic device 806 is disconnected from the magnetic attraction, the position lock of the multiple welding guns 804 is released, the telescopic cylinder 3 is controlled to retract, the entire stroke of the fixed frame 4 is retracted, the sliding column 505 is retracted inward, the outer diameter of the guide moving unit 5 is closed, the radial contact limit between the device and the inner wall of the spiral pipe is released, and the welding moving carriage drives the entire device to smoothly exit the spiral pipe, completing the single pipe multi-wire synchronous internal welding process.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device, comprising mounting plates (1) symmetrically arranged at the top and bottom, characterized in that: The mounting plate (1) is symmetrically arranged at the top and bottom, and the left and right ends are welded to the support frame (2). The inner side of the support frame (2) is fixedly connected to the telescopic cylinder (3) by bolts. The mounting plate (1) is symmetrically arranged at the top and bottom, and a fixed frame (4) is arranged in the middle. The telescopic ends of the telescopic cylinder (3) are fixedly connected to the middle of the left and right ends of the fixed frame (4). The left and right sides of the fixed frame (4) are fixedly connected to the guide moving unit (5). The middle of the fixed frame (4) is fixedly connected to the flipping unit (6). The flipping unit (6) is flipped and a positioning unit (7) is provided. The positioning unit (7) is provided with several welding units (8). The flipping unit (6) includes a first fixing member (601) symmetrically arranged on the left and right sides. The first fixing member (601) is fixedly connected to the upper left and right sides of the fixing frame (4). The bottom of the first fixing member (601) is welded with an annular guide rail (602). The inner circle of the annular guide rail (602) is provided with an annular groove (603). The guide rail robot (604) is arranged in annular movement in the annular groove (603). The outer side of the guide rail robot (604) is fixedly connected with a connecting plate (605) by bolts. The positioning unit (7) includes a first guide carriage (701).

2. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 1, characterized in that: Each of the guide moving units (5) includes a mounting column (501). The mounting column (501) is welded to the left and right ends of the fixed frame (4). The upper and lower parts of the mounting column (501) are fixedly connected to a sleeve (502). The front and rear ends of the sleeve (502) are welded to a support rod (503). The end of the support rod (503) is welded to a sliding sleeve (504). The sliding sleeve (504) is slidably connected to a sliding column (505) in the front and back. The outer end of the sliding column (505) is welded to a first connecting piece (506). The front end of the first connecting piece (506) is fixedly connected to a first pulley (507) by bolts. The inner side of the first connecting piece (506) is fixedly connected to a second pulley (508) by bolts.

3. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 2, characterized in that: Each support rod (503) is provided with a sliding sleeve (509), and each second pulley (508) is provided with a sliding plate (510). Each sliding plate (510) is provided with a fixing post (511) welded to the inner side. The other end of each fixing post (511) is welded to the outer side of the first connector (506). Each fixing post (511) is provided with a spring (512) on the outer side.

4. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 1, characterized in that: Each welding unit (8) includes a second fixing member (801) and a second connecting member (803). The bottom end of the second fixing member (801) is fixedly connected to the front and rear sides by bolts with a matching slider (802). The bottom end of the matching slider (802) is fixedly connected to the upper part of the second connecting member (803). The bottom of the second connecting member (803) is provided with a welding gun (804).

5. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 4, characterized in that: The first guide slide (701) is provided with a first sliding groove (703) on both the front and rear sides. The inner side of the engaging slider (802) is fixedly connected with a third pulley (805) by bolts. The inner side of the engaging slider (802) is slidably connected to the outer side of the corresponding first sliding groove (703), and the third pulley (805) is slidably connected to the groove provided inside the first sliding groove (703).

6. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 4, characterized in that: The upper part of the first guide slide (701) is provided with a central groove (704), and the bottom of the second fixing member (801) is fixedly connected with an electromagnetic device (806) by bolts. The shape of the electromagnetic device (806) is matched with the shape of the central groove (704), and the bottom of the electromagnetic device (806) is slidably connected inside the central groove (704).

7. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 2, characterized in that: The support frame (2) is fixedly connected to the middle of the front and rear ends of the second guide slide (9). The upper and lower parts of the second guide slide (9) are provided with second sliding grooves (901). The second pulley (508) is rolled on the inner side of the corresponding second sliding groove (901). The first pulley (507) is rolled on the inner end face of the spiral tube.

8. The double-sided submerged arc welding spiral pipe longitudinal multi-wire internal welding device according to claim 5, characterized in that: The left and right ends of the first guide slide (701) are fixedly connected to side plates (702) by bolts, and the upper part of the side plates (702) is fixedly connected to the corresponding connecting plates (605) by bolts.

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