Welding tool for narrow-gap automatic laser welding of large thick-wall pipeline

Abstract

The utility model discloses a welding tool for narrow-gap automatic laser welding of a large thick-wall pipeline, which comprises a fixed bottom plate, a first pipeline driving device and a second pipeline driving device are arranged on the fixed bottom plate, two support rails are fixedly connected onto the fixed bottom plate, a pipeline top seat and a welding port top seat are slidably connected onto the support rails, and a welding port is arranged on the welding port top seat. The first pipeline driving device comprises a box body, the box body is slidably connected to the fixed bottom plate, a plurality of sliding rails are fixedly connected into the box body, a driving mechanism is slidably connected to the sliding rails, a lifting mechanism is arranged in the box body and is in transmission connection with the driving mechanism, and a first pipeline fixing seat is fixedly connected to the outside of the box body. And two groups of moving mechanisms are arranged in the fixed bottom plate. The position of the first to-be-welded pipeline and the position of the second to-be-welded pipeline can be adjusted conveniently, the first to-be-welded pipeline and the second to-be-welded pipeline can be rotated according to the welding progress in the welding process, and use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline welding tooling, in particular to a welding tooling used for narrow gap laser automatic welding of thick-walled pipelines. Background Art

[0002] With the vigorous development of the third-generation nuclear power plant technology, the types and number of large thick-walled components have increased, which has put forward higher requirements for welding technology. Among them, the installation and welding quality level of the main pipeline of the nuclear power plant are the most important. At present, narrow gap TIG cold wire automatic welding has been applied to the main pipeline, and has partially replaced the traditional manual welding, and has achieved significant social and economic benefits. The existing narrow gap laser automatic welding of large thick-walled pipes is mainly used for circumferential seam welding after the pipes are butt-jointed. The laser welding process is adopted, but the existing welding tool needs to fix the pipe on the chuck during welding, and the center position of the chuck is fixed. Whether clamping a thinner or thicker pipe, the center of the pipe needs to be lifted to the center position of the chuck, and at the same time, it is necessary to ensure that the two ends of the pipe are at the same height. It takes a long time to clamp and position, resulting in low welding efficiency. For this reason, a welding tool for narrow gap laser automatic welding of large thick-walled pipes is proposed to solve the above problems. Utility Model Content

[0003] The utility model aims to provide a welding tool for automatic laser welding of large thick-walled pipes with narrow gaps, so as to solve the problems existing in the above-mentioned prior art, facilitate the adjustment of the pipe during welding, and improve the welding efficiency.

[0004] To achieve the above purpose, the utility model provides the following solution: The utility model provides a welding tool for automatic laser welding of large thick-walled pipes with narrow gaps, including:

[0005] A fixed bottom plate, a first pipeline driving device and a second pipeline driving device are arranged on the fixed bottom plate, the first pipeline driving device and the second pipeline driving device have the same structure, two support rails are fixedly connected to the fixed bottom plate, a pipeline top seat and a welding port top seat are slidably connected to the support rails, a first pipeline to be welded and a second pipeline to be welded are placed on the pipeline top seat and the welding port top seat, the first pipeline to be welded abuts against the first pipeline driving device, and the second pipeline to be welded abuts against the second pipeline driving device, the first pipeline driving device comprises a box body, the box body is slidably connected to the fixed bottom plate, a plurality of slide rails are fixedly connected to the box body, a driving mechanism is slidably connected to the slide rails, a through hole is opened on the box body, the driving mechanism extends out of the box body through the through hole, a lifting mechanism is arranged in the box body, the lifting mechanism is transmission-connected to the driving mechanism, a first pipeline fixing seat is fixedly connected to the outside of the box body, two groups of moving mechanisms are arranged in the fixed bottom plate, and the two groups of moving mechanisms are transmission-connected to the first pipeline driving device and the second pipeline driving device respectively.

[0006] Preferably, a plurality of connecting rods are fixedly connected to the driving mechanism, a first sliding block is fixedly connected to the connecting rod, and the first sliding block is slidably connected to the sliding rail.

[0007] Preferably, the driving mechanism includes a shell, in which a first motor and a fixed shaft are fixedly connected, the fixed shaft and the first motor output shaft are concentrically arranged, two support arms are rotatably connected to the fixed shaft, a driving roller is rotatably connected to the support arms, the first motor is transmission-connected to the driving roller, and the driving roller abuts against the first pipe to be welded.

[0008] Preferably, a first synchronous wheel is fixedly connected to the driving roller, a second synchronous wheel is fixedly connected to the output end of the first motor, the first synchronous wheel and the second synchronous wheel are connected via a synchronous belt transmission, an arc-shaped slot is opened on the shell, a limit block is arranged in the arc-shaped slot, and a screw is arranged between the limit block and the support arm.

[0009] Preferably, the lifting mechanism includes a third motor and a second screw rod, the third motor is fixedly connected in the box body, two second rotating seats are fixedly connected in the box body, the second screw rod is rotatably connected to the two second rotating seats, the output end of the third motor is fixedly connected to the second screw rod, the second screw rod is threadedly connected to a second threaded block, and the second threaded block is fixedly connected to the shell.

[0010] Preferably, the first pipe fixing seat comprises a fixing frame, the fixing frame is provided with an arc-shaped groove, the fixing frame is provided with a plurality of fixing slots, a plurality of supporting wheels are placed in the fixing slots, and the first pipe to be welded is placed on the plurality of supporting wheels.

[0011] Preferably, the pipe top seat includes a connecting base, a plurality of support rods are fixedly connected to the top of the connecting base, a second pipe fixing seat is fixedly connected to the support rods, a plurality of first rollers are fixedly connected to the bottom surface of the connecting base, the first rollers are rollingly connected to the support rails, the welding port top seat and the pipe top seat have the same structure, and the second pipe fixing seat has the same structure as the first pipe fixing seat.

[0012] Preferably, a mounting groove is provided in the fixed base plate, the movable mechanism is located in the mounting groove, the movable mechanism includes a second motor and a plurality of first rotating seats, the second motor and the first rotating seats are fixedly connected in the mounting groove, a first screw rod is rotatably connected to the first rotating seat, the output end of the second motor is fixedly connected to the first screw rod, a first threaded block is threadedly connected to the first screw rod, the first threaded block is fixedly connected to the bottom surface of the box body, a cushion block is fixedly connected to the bottom surface of the box body, a second slider is fixedly connected to the cushion block, a sliding rail is fixedly connected in the mounting groove, and the second slider is slidably connected to the sliding rail.

[0013] The utility model discloses the following technical effects: in the device, the first pipe to be welded and the second pipe to be welded are placed on the pipe top seat and the welding port top seat, the first pipe to be welded and the second pipe to be welded are placed on the welding port top seat for convenient welding, the end of the first pipe to be welded is placed on the first pipe fixing seat, the second pipe driving device also contains the same structure as the first pipe fixing seat, which is used to place the second pipe to be welded, the driving mechanism is used to drive the first pipe to be welded, and the first pipe to be welded can be rotated as the welding progresses during the welding process, and the second pipe driving device has the same structure to drive the second pipe to be welded, the lifting mechanism can drive the driving mechanism to move on the slide rail, and the height of the driving mechanism can be adjusted according to different pipe diameters, and two sets of moving mechanisms are used for the first pipe driving device and the second pipe driving device respectively. The utility model facilitates the adjustment of the positions of the first pipe to be welded and the second pipe to be welded, and can also rotate the first pipe to be welded and the second pipe to be welded according to the welding progress during the welding process, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a schematic diagram of a welding tooling mechanism for the utility model used for automatic laser welding of narrow gaps in thick-walled pipes;

[0016] Figure 2 This is a front view of the first pipeline driving device of the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the first pipeline driving device of the utility model;

[0018] Figure 4 For this utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 5 It is a structural schematic diagram of the drive assembly of the utility model;

[0020] Figure 6 This is a structural schematic diagram of the pipe top seat of the utility model;

[0021] Figure 7 This is a structural schematic diagram of the first pipe fixing seat of the utility model;

[0022] Figure 8 It is a structural schematic diagram of the limit block of the utility model;

[0023] Among them, 1. fixed bottom plate; 2. support rail; 3. pipe top seat; 31. connecting base; 32. support rod; 33. second pipe fixing seat; 34. first roller; 4. welding port top seat; 5. first pipe driving device; 51. box; 52. driving mechanism; 53. connecting rod; 54. first slider; 55. slide rail; 56. first pipe fixing seat; 57. lifting mechanism; 521. shell; 522. first motor; 523. fixed shaft; 524. support arm; 525. driving roller; 526. first synchronous wheel; 527. second synchronous wheel; 528. Synchronous belt; 529, arc-shaped slot; 5210, limit block; 5211, screw; 571, third motor; 572, second rotating seat; 573, second screw; 574, second threaded block; 561, fixed frame; 562, arc-shaped groove; 563, fixed slot; 564, support wheel; 58, cushion block; 59, second slider; 6, second pipeline driving device; 7, moving mechanism; 71, second motor; 72, first rotating seat; 73, first screw; 74, first threaded block; 8, sliding track; 9, first pipeline to be welded; 10, second pipeline to be welded. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1-8 The utility model provides a welding tool for automatic laser welding of large thick-walled pipes with narrow gaps, comprising:

[0027] A fixed base plate 1 is provided with a first pipeline driving device 5 and a second pipeline driving device 6. The first pipeline driving device 5 and the second pipeline driving device 6 have the same structure. Two support rails 2 are fixedly connected to the fixed base plate 1. A pipeline top seat 3 and a welding port top seat 4 are slidably connected to the support rail 2. A first pipeline to be welded 9 and a second pipeline to be welded 10 are placed on the pipeline top seat 3 and the welding port top seat 4. The first pipeline to be welded 9 abuts against the first pipeline driving device 5, and the second pipeline to be welded 10 abuts against the second pipeline driving device 6. The first pipeline driving device 5 The utility model comprises a box body 51, which is slidably connected to the fixed bottom plate 1, a plurality of slide rails 55 are fixedly connected inside the box body 51, a driving mechanism 52 is slidably connected to the slide rails 55, a through hole is opened on the box body 51, the driving mechanism 52 extends out of the box body 51 through the through hole, a lifting mechanism 57 is arranged inside the box body 51, the lifting mechanism 57 is transmission-connected to the driving mechanism 52, a first pipe fixing seat 56 is fixedly connected outside the box body 51, two groups of moving mechanisms 7 are arranged inside the fixed bottom plate 1, and the two groups of moving mechanisms 7 are transmission-connected to the first pipe driving device 5 and the second pipe driving device 6 respectively.

[0028] In the present device, the first pipe to be welded 9 and the second pipe to be welded 10 are placed on the pipe top seat 3 and the welding port top seat 4. The first pipe to be welded 9 and the second pipe to be welded 10 are placed on the welding port top seat 4 for easy welding. The end of the first pipe to be welded 9 is placed on the first pipe fixing seat 56. The second pipe driving device 6 also has the same structure as the first pipe fixing seat 56, which is used to place the second pipe to be welded 10. The driving mechanism 52 is used to drive the first pipe to be welded 9. During the welding process, the first pipe to be welded 9 can be rotated as the welding progresses. The second pipe driving device 6 has the same structure to drive the second pipe to be welded 10. The lifting mechanism 57 can drive the driving mechanism 52 to move on the slide rail 55. The height of the driving mechanism 52 can be adjusted according to different pipe diameters. The two sets of moving mechanisms 7 are used for the first pipe driving device 5 and the second pipe driving device 6 respectively.

[0029] According to a further optimized solution, a plurality of connecting rods 53 are fixedly connected to the driving mechanism 52 , a first sliding block 54 is fixedly connected to the connecting rod 53 , and the first sliding block 54 is slidably connected to the sliding rail 55 .

[0030] The driving mechanism 52 slides on the slide rail 55 via the first slide block 54 .

[0031] A further optimized solution is that the driving mechanism 52 includes a shell 521, in which a first motor 522 and a fixed shaft 523 are fixedly connected, the fixed shaft 523 and the output shaft of the first motor 522 are concentrically arranged, two support arms 524 are rotatably connected to the fixed shaft 523, a driving roller 525 is rotatably connected to the support arm 524, the first motor 522 is transmission-connected to the driving roller 525, and the driving roller 525 abuts against the first pipe 9 to be welded.

[0032] The two support arms 524 are both rotatably connected with driving rollers 525 . The first motor 522 is mounted on the housing 521 . The first motor 522 drives the driving rollers 525 to rotate. The driving rollers 525 are used to drive the first pipe 9 to be welded to rotate.

[0033] To further optimize the solution, a first synchronous wheel 526 is fixedly connected to the driving roller 525, a second synchronous wheel 527 is fixedly connected to the output end of the first motor 522, the first synchronous wheel 526 and the second synchronous wheel 527 are connected through a synchronous belt 528, an arc-shaped slot 529 is opened on the shell 521, a limit block 5210 is arranged in the arc-shaped slot 529, and a screw 5211 is arranged between the limit block 5210 and the support arm 524.

[0034] The first motor 522 drives the second synchronous wheel 527 to rotate, and the second synchronous wheel 527 drives the first synchronous wheel 526 to rotate through the synchronous belt 528, so that the driving roller 525 rotates, and the limit block 5210 is in the arc-shaped slot 529. Figure 8 It can be seen that a plurality of grooves are provided on the two sides of the limit block 5210. Figure 4 It can be seen that a number of protrusions are fixedly connected in the arc-shaped slot 529, and the protrusions are adapted to the grooves. After the limit block 5210 is inserted into the arc-shaped slot 529, the protrusions will enter the grooves, so that the limit block 5210 will not move along the arc-shaped slot 529. A threaded hole is opened on the limit block 5210, and the screw 5211 is threadedly connected in the threaded hole. The screw 5211 is screwed into the threaded hole until the screw 5211 abuts against the support arm 524 to fix the support arm 524. The limit block 5210 is connected to the support arm 524 through the screw 5211, so that the support arm 524 can maintain a stable state.

[0035] A further optimized solution is that the lifting mechanism 57 includes a third motor 571 and a second screw rod 573. The third motor 571 is fixedly connected in the box body 51. Two second rotating seats 572 are fixedly connected in the box body 51. The second screw rod 573 is rotatably connected to the two second rotating seats 572. The output end of the third motor 571 is fixedly connected to the second screw rod 573. The second screw rod 573 is threadedly connected to a second threaded block 574. The second threaded block 574 is fixedly connected to the shell 521.

[0036] The third motor 571 drives the second screw rod 573 to rotate. When the second screw rod 573 rotates, the second thread block 574 moves up and down, and the second thread block 574 drives the housing 521 to move.

[0037] According to a further optimization scheme, the first pipe fixing seat 56 includes a fixing frame 561 , an arc-shaped groove 562 is provided on the fixing frame 561 , a plurality of fixing slots 563 are provided on the fixing frame 561 , a plurality of supporting wheels 564 are placed in the fixing slots 563 , and the first pipe 9 to be welded is placed on the plurality of supporting wheels 564 .

[0038] A plurality of fixing slots 563 are provided on the arc-shaped groove 562 and the upper end surface of the fixing frame 561 , and the position of the supporting wheel 564 can be adjusted according to the first pipe 9 to be welded of different diameters.

[0039] A further optimized solution is that the pipe top seat 3 includes a connecting base 31, a plurality of support rods 32 are fixedly connected to the top of the connecting base 31, a second pipe fixing seat 33 is fixedly connected to the support rods 32, a plurality of first rollers 34 are fixedly connected to the bottom surface of the connecting base 31, the first rollers 34 are rollingly connected to the support rail 2, the welding port top seat 4 and the pipe top seat 3 have the same structure, and the second pipe fixing seat 33 and the first pipe fixing seat 56 have the same structure.

[0040] The first roller 34 is used to roll on the support rail 2 to facilitate adjustment of the position of the second pipe fixing seat 33. The second pipe fixing seat 33 and the first pipe fixing seat 56 have the same structure, and the structures of the welding port top seat 4 and the pipe top seat 3 are also the same.

[0041] A further optimized solution is provided in the fixed base plate 1 with a mounting groove, the movable mechanism 7 is located in the mounting groove, the movable mechanism 7 includes a second motor 71 and a plurality of first rotating seats 72, the second motor 71 and the first rotating seats 72 are fixedly connected in the mounting groove, a first screw rod 73 is rotatably connected to the first rotating seat 72, the output end of the second motor 71 is fixedly connected to the first screw rod 73, a first threaded block 74 is threadedly connected to the first screw rod 73, the first threaded block 74 is fixedly connected to the bottom surface of the box body 51, a cushion block 58 is fixedly connected to the bottom surface of the box body 51, a second slider 59 is fixedly connected to the cushion block 58, a sliding rail 8 is fixedly connected in the mounting groove, and the second slider 59 is slidably connected to the sliding rail 8.

[0042] The second motor 71 drives the first screw rod 73 to rotate. When the first screw rod 73 rotates, it drives the first threaded block 74 to rotate. The first threaded block 74 drives the box body 51 to move. The second slider 59 moves on the sliding track 8. The box body 51 is slidably connected to the fixed base plate 1 through the cooperation of the second slider 59 and the sliding track 8.

[0043] The method of using the device is as follows: the first pipe to be welded 9 and the second pipe to be welded 10 are placed on the support wheel 564, so that the first pipe to be welded 9 and the second pipe to be welded 10 are close to each other, the second motor 71 drives the first screw rod 73 to rotate, and when the first screw rod 73 rotates, it drives the first thread block 74 to rotate, and the first thread block 74 drives the box body 51 to move. Similarly, the second pipe driving device 6 also drives the second pipe to be welded 10 to move, and the height of the driving roller 525 is adjusted. The third motor 571 drives the second screw rod 573 to rotate. When the second screw rod 573 rotates, the second thread block 574 The second threaded block 574 drives the housing 521 to move, thereby driving the driving roller 525 to move up and down. During the welding process, the first pipe 9 to be welded and the second pipe 10 to be welded are rotated according to the welding progress. The first motor 522 drives the second synchronous wheel 527 to rotate. The second synchronous wheel 527 drives the first synchronous wheel 526 to rotate through the synchronous belt 528, thereby rotating the driving roller 525. The driving roller 525 drives the first pipe 9 to be welded to rotate. The second pipe driving device 6 also has the same structure to drive the second pipe 10 to be welded to rotate.

[0044] The utility model arranges the pipe top seat 3, the welding port top seat 4, the first pipe fixing seat 56 and the second pipe fixing seat 33 in the same horizontal plane, and adjusts the distance between the support wheels 564 at the same time to adapt to different pipe diameters. When fixing the pipe, it is directly placed on the top of the pipe top seat 3, the welding port top seat 4, the first pipe fixing seat 56 and the second pipe fixing seat 33, avoiding the steps of lifting the first pipe to be welded 9 and the second pipe to be welded 10 to the center position of the chuck and leveling, thereby improving the clamping efficiency; in addition, the driving roller 525 on the driving mechanism 52 contacts the inner wall or outer wall of the first pipe to be welded 9 and the second pipe to be welded 10 to provide power for the rotation of the first pipe to be welded 9 and the second pipe to be welded 10, thereby realizing the rotation of the first pipe to be welded 9 and the second pipe to be welded 10 during the welding process, and the driving roller 525 is at different positions of the first pipe to be welded 9 and the second pipe to be welded 10 and adjusting the distance between the two support arms 524 to adapt to pipes of different diameters, thereby expanding the scope of application.

[0045] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A welding tool for automatic laser welding of narrow gaps in thick-walled pipes, characterized in that: include: A fixed base plate (1), wherein a first pipeline driving device (5) and a second pipeline driving device (6) are arranged on the fixed base plate (1), wherein the first pipeline driving device (5) and the second pipeline driving device (6) have the same structure, wherein two support rails (2) are fixedly connected to the fixed base plate (1), wherein a pipeline top seat (3) and a welding port top seat (4) are slidably connected to the support rails (2), wherein a first pipeline to be welded (9) and a second pipeline to be welded (10) are placed on the pipeline top seat (3) and the welding port top seat (4), wherein the first pipeline to be welded (9) is in contact with the first pipeline driving device (5), and the second pipeline to be welded (10) is in contact with the second pipeline driving device (6), wherein the first pipeline driving device (5) comprises a box body ( The box (51) is slidably connected to the fixed base plate (1), a plurality of slide rails (55) are fixedly connected inside the box (51), a driving mechanism (52) is slidably connected to the slide rails (55), a through hole is provided on the box (51), the driving mechanism (52) extends out of the box (51) through the through hole, a lifting mechanism (57) is arranged inside the box (51), the lifting mechanism (57) is transmission-connected to the driving mechanism (52), a first pipeline fixing seat (56) is fixedly connected outside the box (51), two groups of moving mechanisms (7) are arranged inside the fixed base plate (1), the two groups of moving mechanisms (7) are transmission-connected to the first pipeline driving device (5) and the second pipeline driving device (6) respectively.

2. The welding tool for automatic laser welding of narrow gaps of thick-walled pipes according to claim 1 is characterized by: A plurality of connecting rods (53) are fixedly connected to the driving mechanism (52), a first sliding block (54) is fixedly connected to the connecting rod (53), and the first sliding block (54) is slidably connected to the sliding rail (55).

3. The welding tool for automatic laser welding of large thick-walled pipes with narrow gaps according to claim 1 is characterized by: The driving mechanism (52) comprises a housing (521), a first motor (522) and a fixed shaft (523) are fixedly connected inside the housing (521), the fixed shaft (523) and the output shaft of the first motor (522) are arranged concentrically, two support arms (524) are rotatably connected to the fixed shaft (523), a driving roller (525) is rotatably connected to the support arm (524), the first motor (522) is transmission-connected to the driving roller (525), and the driving roller (525) abuts against the first pipe (9) to be welded.

4. The welding tool for automatic laser welding of narrow gaps of thick-walled pipes according to claim 3 is characterized by: The driving roller (525) is fixedly connected to a first synchronous wheel (526); the output end of the first motor (522) is fixedly connected to a second synchronous wheel (527); the first synchronous wheel (526) and the second synchronous wheel (527) are connected by a synchronous belt (528); an arc-shaped slot (529) is provided on the housing (521); a limit block (5210) is provided in the arc-shaped slot (529); and a screw (5211) is provided between the limit block (5210) and the support arm (524).

5. The welding tool for automatic laser welding of large thick-walled pipes with narrow gaps according to claim 3 is characterized by: The lifting mechanism (57) comprises a third motor (571) and a second screw rod (573); the third motor (571) is fixedly connected in the box body (51); two second rotating seats (572) are fixedly connected in the box body (51); the second screw rod (573) is rotatably connected to the two second rotating seats (572); the output end of the third motor (571) is fixedly connected to the second screw rod (573); a second threaded block (574) is threadedly connected to the second screw rod (573); and the second threaded block (574) is fixedly connected to the housing (521).

6. The welding tool for automatic laser welding of large thick-walled pipes with narrow gaps according to claim 1 is characterized by: The first pipe fixing seat (56) comprises a fixing frame (561), the fixing frame (561) is provided with an arc-shaped groove (562), the fixing frame (561) is provided with a plurality of fixing slots (563), a plurality of supporting wheels (564) are placed in the fixing slots (563), and the first pipe to be welded (9) is placed on the plurality of supporting wheels (564).

7. The welding tool for automatic laser welding of large thick-walled pipes with narrow gaps according to claim 6 is characterized by: The pipeline top seat (3) comprises a connecting base (31), a plurality of support rods (32) are fixedly connected to the top of the connecting base (31), a second pipeline fixing seat (33) is fixedly connected to the support rods (32), a plurality of first rollers (34) are fixedly connected to the bottom of the connecting base (31), the first rollers (34) are rollingly connected to the support rail (2), the welding port top seat (4) and the pipeline top seat (3) have the same structure, and the second pipeline fixing seat (33) and the first pipeline fixing seat (56) have the same structure.

8. The welding tool for automatic laser welding of large thick-walled pipes with narrow gaps according to claim 1 is characterized by: The fixed base plate (1) is provided with a mounting groove, the moving mechanism (7) is located in the mounting groove, the moving mechanism (7) comprises a second motor (71) and a plurality of first rotating seats (72), the second motor (71) and the first rotating seats (72) are fixedly connected in the mounting groove, a first screw rod (73) is rotatably connected to the first rotating seat (72), the output end of the second motor (71) is fixedly connected to the first screw rod (73), a first threaded block (74) is threadedly connected to the first screw rod (73), the first threaded block (74) is fixedly connected to the bottom surface of the box body (51), a cushion block (58) is fixedly connected to the bottom surface of the box body (51), a second slider (59) is fixedly connected to the cushion block (58), a sliding track (8) is fixedly connected in the mounting groove, and the second slider (59) is slidably connected to the sliding track (8).

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