Pipe fitting welding auxiliary mechanism

Abstract

The utility model belongs to the technical field of welding, and particularly relates to a pipe fitting welding auxiliary mechanism which comprises a base, a mounting seat is fixedly connected to the bottom of the base, and moving frames are arranged on the two sides of the mounting seat. Two moving rods are fixedly connected to the inner side wall of each moving frame; a motor is started, the motor drives a second rotating wheel to rotate through an output shaft, the second rotating wheel drives two first rotating wheels to rotate through a belt, the first rotating wheels drive a bidirectional ball screw to rotate, the bidirectional ball screw drives a moving rod to move in different directions, and the moving rod drives a moving frame to move in different directions. The moving frame drives the first lower clamping plate and the first upper clamping plate to move in different directions until the cross beam is tightly inserted into the longitudinal beam, so that the welding device is suitable for cross beams with different widths, and welding of frames with different widths is realized; when the movable frame moves, the movable frame drives the supporting columns to move, the supporting columns drive the movable wheels to move, and therefore the position of the movable frame can be conveniently and rapidly adjusted.

Description

A pipe fitting welding auxiliary mechanism Technical Field

[0001] This utility model belongs to the field of welding technology, specifically a pipe welding auxiliary mechanism. Background Technology

[0002] The chassis is a frame structure that spans the front and rear axles of a car. It is the base of the car and is generally composed of tubular longitudinal beams and cross beams. The chassis must have sufficient strength and rigidity to withstand the load of the car and the impact transmitted from the wheels. The welding of the chassis is an important factor that determines the strength and rigidity of the chassis. When processing the chassis, several tubular components need to be welded together.

[0003] A Chinese patent with publication number CN216829386U discloses a chassis welding auxiliary device. The chassis includes a support frame, a front frame and a partition plate arranged side by side at one end of the support frame. The chassis welding auxiliary device includes: a first support supporting the support frame, and a second support jointly supporting the front frame and the partition plate. The first support includes: a plurality of first positioning adjustment components arranged in pairs along the extension direction of the chassis and clamping the outer side of the support frame; a plurality of second positioning adjustment components arranged in pairs along the extension direction of the chassis and abutting the inner side of the support frame; and a support base. The first and second positioning adjustment components are arranged on the first support of the support frame, and the third and fourth positioning adjustment components are arranged on the second support jointly supporting the front frame and the partition plate. Through the cooperation of the positioning adjustment components, fast and accurate clamping is achieved, improving the product quality of the welded chassis.

[0004] In the existing technology, the first bracket is a fixed frame, and then the frame is fixed and welded by the first positioning adjustment component and the second positioning adjustment component. However, since different models have different frames, the above-mentioned auxiliary device is only suitable for fixing one type of frame. Other models of frames cannot be fixed. During welding, other auxiliary devices need to be replaced, which reduces the applicability.

[0005] Therefore, a pipe welding auxiliary mechanism is proposed to address the above problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the problem of unsuitability for fixing vehicle frames of different sizes, a tube welding auxiliary mechanism is proposed.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A pipe welding auxiliary mechanism of this utility model includes a base, a mounting seat fixedly connected to the bottom of the base, and movable frames provided on both sides of the mounting seat; two movable rods are fixedly connected to the inner sidewalls of each movable frame; two bidirectional ball screws are rotatably connected to the mounting seat via bearings, and the movable rods are threaded to both ends of the bidirectional ball screws; a first rotating wheel is fixedly connected to the middle of each bidirectional ball screw; a motor is fixedly connected to the bottom of the mounting seat, and the output shaft of the motor is rotatably connected to the mounting seat via bearings and fixedly connected to a second rotating wheel; belts are sleeved on the outer sides of the two first and second rotating wheels; support columns are fixedly connected to the bottom of both ends of the movable frame, and movable wheels are installed at the bottom of each support column.

[0008] Preferably, one side of the movable frame is provided with two rotating plates, and the bottom of each rotating plate is fixedly connected to a rotating frame; one end of each rotating frame is fixedly connected to a telescopic cylinder and a sleeve, and one end of each telescopic cylinder and sleeve is rotatably connected to the inner wall of the two movable frames; two limiting rods are fixedly connected to the outer wall of each telescopic cylinder, and the limiting rods and the telescopic cylinder are slidably connected inside the sleeve; one end of each telescopic cylinder extends to the outer side of the movable frame and is fixedly connected to a gear; two fixing plates are fixedly connected to the outer wall of the movable frame, and a sliding rod is fixedly connected between the two fixing plates; a rack is slidably connected to the sliding rod through two connecting plates, and the gear meshes with the rack; a second electric actuator is fixedly connected to the side wall of the movable frame, and the output end of the second electric actuator is fixedly connected to the rack.

[0009] Preferably, a first electric actuator is fixedly connected to the bottom of each rotating plate, a first clamping plate is fixedly connected to the output end of each first electric actuator, a rectangular opening is provided on each rotating plate, the first clamping plate is slidably connected in the rectangular opening, a second clamping plate is fixedly connected to each rotating plate, and a front frame is provided between the first clamping plate and the second clamping plate.

[0010] Preferably, each of the movable frames is fixedly connected to a fixed seat at one end near the rotating plate, and a first cylinder is fixedly connected to the top of each fixed seat. A first upper clamping plate is fixedly connected to the output end of each first cylinder, and a first lower clamping plate is fixedly connected to each fixed seat. A longitudinal beam is provided between the first upper clamping plate and the first lower clamping plate, and multiple crossbeams are inserted between the longitudinal beams.

[0011] Preferably, each of the movable frames has a movable seat slidably connected to the end away from the rotating plate, a second cylinder is fixedly connected to the top of each movable seat, a second upper clamping plate is fixedly connected to the output end of each second cylinder, a second lower clamping plate is fixedly connected to each movable seat, and one end of each longitudinal beam is located between the second upper clamping plate and the second lower clamping plate.

[0012] Preferably, each of the movable frames has a sliding opening at one end; each of the movable seats has an L-shaped plate fixedly connected to it, each of the L-shaped plates has a slidably connected post, each of the posts has a pull plate fixedly connected to one end, each of the pull plate and the L-shaped plate has a spring, each of the movable frames has multiple slots, and each post is inserted through into the slot.

[0013] The beneficial effects of this utility model are:

[0014] This utility model provides a pipe welding auxiliary mechanism. Through the cooperation of a first rotating wheel, a second rotating wheel, a belt, and a bidirectional ball screw, a crossbeam and a longitudinal beam are inserted and placed between a first upper clamping plate and a first lower clamping plate. The motor needs to be turned on, and the motor drives the second rotating wheel to rotate via its output shaft. The second rotating wheel drives the two first rotating wheels to rotate via the belt. The first rotating wheels drive the bidirectional ball screw to rotate, which in turn drives a moving rod to move in different directions. The moving rod drives a moving frame to move in different directions, and the moving frame drives the first lower clamping plate and the first upper clamping plate to move in different directions until the crossbeam is tightly inserted into the longitudinal beam. This allows for the welding of crossbeams of different widths and enables the welding of frames of different widths. During movement, the moving frame drives the support column, which in turn drives the moving wheels, facilitating quick adjustment of the moving frame's position.

[0015] This utility model provides a pipe welding auxiliary mechanism. Through the cooperation of a rack, gear, and limiting rod, the second electric actuator is activated, and the output end of the second electric actuator drives the rack to move. The rack drives the gear to rotate, and the gear drives the telescopic cylinder to rotate. The telescopic cylinder drives the sleeve to rotate through the limiting rod. The telescopic cylinder and the sleeve drive the rotating frame to rotate, and the rotating frame drives the rotating plate to rotate, thereby adjusting the angle of the rotating plate until the front frame on the rotating plate is engaged with the crossbeam or longitudinal beam. The first electric actuator is then activated, and the first electric actuator drives the first clamping plate to move through its output end. When the first clamping plate moves, it fixes the front frame between the first clamping plate and the second clamping plate. Once the fixing is complete, welding work can begin. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 is a perspective view of this utility model;

[0018] Figure 2 is a cross-sectional view of this utility model;

[0019] Figure 3 is a perspective view of the movable rod in this utility model;

[0020] Figure 4 is a perspective view of the rotating frame in this utility model;

[0021] Figure 5 is a perspective view of the gear and rack in this utility model;

[0022] Figure 6 is a perspective view of the movable seat in this utility model;

[0023] Legend:

[0024] 1. Base; 2. Mounting seat; 21. First rotating wheel; 22. Second rotating wheel; 23. Belt; 24. Motor; 25. Double-acting ball screw; 26. Moving rod; 3. Longitudinal beam; 31. Crossbeam; 32. Front frame; 4. Moving frame; 41. Support column; 42. Moving wheel; 43. Fixed seat; 431. First cylinder; 432. First upper clamping plate; 433. First lower clamping plate; 44. Moving seat; 441. Second cylinder; 442. Second upper clamping plate; 4 43. Second lower clamping plate; 444. L-shaped plate; 445. Insert post; 446. Pull plate; 447. Spring; 45. Insertion port; 46. Sliding port; 5. Rotating plate; 51. Telescopic cylinder; 511. Gear; 512. Rack; 513. Fixing plate; 514. Slide rod; 515. Connecting plate; 516. Second electric actuator; 52. Sleeve; 53. Limiting rod; 54. Rotating frame; 55. First electric actuator; 56. First clamping plate; 57. Second clamping plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Specific implementation examples are given below.

[0027] Please refer to Figures 1-6. This utility model provides a pipe welding auxiliary mechanism, including a base 1. A mounting seat 2 is fixedly connected to the bottom of the base 1. Movable frames 4 are provided on both sides of the mounting seat 2. Two moving rods 26 are fixedly connected to the inner sidewall of each moving frame 4. Two bidirectional ball screws 25 are rotatably connected to the mounting seat 2 via bearings. The moving rods 26 are threaded to both ends of the bidirectional ball screws 25. A first rotating wheel 21 is fixedly connected to the middle of each bidirectional ball screw 25. A motor 24 is fixedly connected to the bottom of the mounting seat 2. The output shaft of the motor 24 is rotatably connected to the mounting seat 2 via bearings and a second rotating wheel 22 is fixedly connected thereto. Belts 23 are sleeved on the outer sides of the two first rotating wheels 21 and the second rotating wheel 22. Support columns 41 are fixedly connected to the bottom of both ends of the moving frame 4. Moving wheels 42 are installed at the bottom of each support column 41.

[0028] During operation, to address the issue of not being able to fix frames of different sizes, the crossbeam 31 and longitudinal beam 3 are inserted and placed between the first upper clamping plate 432 and the first lower clamping plate 433. The motor 24 is then turned on. The motor 24 drives the second rotating wheel 22 to rotate via its output shaft. The second rotating wheel 22 drives the two first rotating wheels 21 to rotate via a belt 23. The first rotating wheels 21 drive the bidirectional ball screw 25 to rotate, which in turn drives the moving rod 26 to move in different directions. The moving rod 26 then drives the moving frame 4 to move in different directions, which in turn drives the first lower clamping plate 433 and the first upper clamping plate 432 to move in different directions until the crossbeam 31 is tightly inserted into the longitudinal beam 3. This allows for the use of crossbeams 31 of different widths, enabling welding of frames of varying widths. During movement, the moving frame 4 drives the support column 41, which in turn drives the moving wheel 42, facilitating quick adjustment of the moving frame 4's position.

[0029] Furthermore, as shown in Figures 4 and 5, two rotating plates 5 are provided on one side of the movable frame 4, and a rotating frame 54 is fixedly connected to the bottom of each rotating plate 5; a telescopic cylinder 51 and a sleeve 52 are respectively fixedly connected to one end of each rotating frame 54, and one end of each telescopic cylinder 51 and sleeve 52 is rotatably connected to the inner wall of the two movable frames 4; two limiting rods 53 are fixedly connected to the outer wall of each telescopic cylinder 51, and the limiting rods 53 and the telescopic cylinder 51 are slidably connected inside the sleeve 52; the telescopic cylinder 51... One end of the retractable cylinder 51 extends to the outside of the movable frame 4 and is fixedly connected to a gear 511; two fixed plates 513 are fixedly connected to the outer wall of the movable frame 4, and a slide rod 514 is fixedly connected between the two fixed plates 513. A rack 512 is slidably connected to the slide rod 514 through two connecting plates 515, and the gear 511 meshes with the rack 512; a second electric push rod 516 is fixedly connected to the side wall of the movable frame 4, and the output end of the second electric push rod 516 is fixedly connected to the rack 512.

[0030] During operation, the moving frame 4 moves, driving the telescopic cylinder 51 and sleeve 52 to move. The telescopic cylinder 51 and sleeve 52 then drive the rotating frame 54 to move, which in turn drives the two rotating plates 5 to move, thus adjusting the distance between the two rotating plates 5. The front frame 32 is then fixed onto the rotating plate 5 and engaged with the longitudinal beam 3 or the cross beam 31. Since the connection angle of the front frame 32 may vary, it is sometimes necessary to adjust the angle of the front frame 32. By activating the second electric actuator 516, the output end of the second electric actuator 516 drives the rack 512 to move, which in turn drives the gear 511 to rotate. The gear 511 then drives the telescopic cylinder 51 to rotate, which in turn drives the sleeve 52 to rotate via the limit rod 53. The telescopic cylinder 51 and sleeve 52 then drive the rotating frame 54 to rotate, which in turn drives the rotating plate 5 to rotate, thus adjusting the angle of the rotating plate 5 until the front frame 32 on the rotating plate 5 is engaged with the cross beam 31 or the longitudinal beam 3.

[0031] Furthermore, as shown in Figure 4, a first electric push rod 55 is fixedly connected to the bottom of each rotating plate 5, and a first clamping plate 56 is fixedly connected to the output end of each first electric push rod 55. A rectangular opening is provided on each rotating plate 5, and the first clamping plate 56 is slidably connected in the rectangular opening. A second clamping plate 57 is fixedly connected to each rotating plate 5, and a front frame 32 is provided between the first clamping plate 56 and the second clamping plate 57.

[0032] When it is necessary to fix the front frame 32 during operation, the first electric push rod 55 needs to be activated. The first electric push rod 55 drives the first clamping plate 56 to move through the output end. When the first clamping plate 56 moves, it fixes the front frame 32 between the first clamping plate 56 and the second clamping plate 57.

[0033] Furthermore, as shown in Figure 1, each of the movable frame 4 has a fixed base 43 fixedly connected to one end near the rotating plate 5. Each of the fixed bases 43 has a first cylinder 431 fixedly connected to its top. Each of the first cylinders 431 has a first upper clamping plate 432 fixedly connected to its output end. Each of the fixed bases 43 has a first lower clamping plate 433 fixedly connected to its top end. Each of the first upper clamping plate 432 and the first lower clamping plate 433 has a longitudinal beam 3 between them. Multiple crossbeams 31 are inserted between the longitudinal beams 3.

[0034] When the longitudinal beam 3 needs to be fixed during operation, the first cylinder 431 is opened. The first cylinder 431 drives the first upper clamping plate 432 to move through the output end. The first upper clamping plate 432 fixes the longitudinal beam 3 between the first upper clamping plate 432 and the first lower clamping plate 433.

[0035] Furthermore, as shown in Figures 1 and 6, each of the movable frames 4 has a movable seat 44 slidably connected to the end away from the rotating plate 5. A second cylinder 441 is fixedly connected to the top of each movable seat 44. A second upper clamping plate 442 is fixedly connected to the output end of each second cylinder 441. A second lower clamping plate 443 is fixedly connected to each movable seat 44. One end of each longitudinal beam 3 is located between the second upper clamping plate 442 and the second lower clamping plate 443.

[0036] During operation, the ends of the longitudinal beam 3 need to be fixed. The movable seat 44 needs to be adjusted to a suitable position. Then, the second cylinder 441 is turned on. The second cylinder 441 drives the second upper clamping plate 442 to move through the output end. The second upper clamping plate 442 fixes the longitudinal beam 3 between the second upper clamping plate 442 and the second lower clamping plate 443, thereby fixing both ends of the longitudinal beam 3 for easy welding.

[0037] Furthermore, as shown in Figure 6, each of the movable frames 4 has a sliding opening 46 at one end; each of the movable seats 44 has an L-shaped plate 444 fixedly connected to it, each of the L-shaped plates 444 has a slidably connected insertion post 445, each of the insertion posts 445 has a pull plate 446 fixedly connected to one end, each of the pull plate 446 and the L-shaped plate 444 has a spring 447, each of the movable frames 4 has multiple insertion slots 45, and each of the insertion posts 445 is inserted through into the insertion slots 45.

[0038] When adjusting the position of the movable seat 44 during operation, the pull plate 446 is pulled outward, causing the insertion post 445 to move outward away from the socket 45. At this time, the spring 447 is stretched. Then, by pushing the movable seat 44, the movable seat 44 slides within the sliding port 46, moving the movable seat 44 to the appropriate position. By releasing the pull plate 446, under the action of the spring 447, the insertion post 445 quickly returns to its original position within another socket 45, fixing the movable seat 44 in another position.

[0039] Working principle: By inserting the crossbeam 31 and the longitudinal beam 3 together and placing them between the first upper clamping plate 432 and the first lower clamping plate 433, the motor 24 needs to be turned on. The motor 24 drives the second rotating wheel 22 to rotate through the output shaft. The second rotating wheel 22 drives the two first rotating wheels 21 to rotate through the belt 23. The first rotating wheels 21 drive the bidirectional ball screw 25 to rotate. The bidirectional ball screw 25 drives the moving rod 26 to move in different directions. The moving rod 26 drives the moving frame 4 to move in different directions. The moving frame 4 drives the first lower clamping plate 433 and the first upper clamping plate 432 to move in different directions until the crossbeam 31 is tightly inserted into the longitudinal beam 3. This allows for the use of crossbeams 31 of different widths, enabling the welding of frames of different widths. When the moving frame 4 moves, it drives the support column 41 to move. The support column 41 drives the moving wheel 42 to move, which facilitates quick adjustment of the position of the moving frame 4.

[0040] When the longitudinal beam 3 needs to be fixed, the first cylinder 431 is activated. The first cylinder 431 drives the first upper clamping plate 432 to move through its output end. The first upper clamping plate 432 fixes the longitudinal beam 3 between the first upper clamping plate 432 and the first lower clamping plate 433. Then, the movable seat 44 is adjusted to a suitable position. By pulling the pull plate 446 outward, the pull plate 446 drives the insertion post 445 to move outward away from the insertion port 45. At this time, the spring 447 is stretched. Then, by pushing the movable seat 44, the movable seat 44 moves at the sliding port 4. The sliding mechanism 6 moves the movable seat 44 to a suitable position. By releasing the pull plate 446, the insert 445 quickly resets to another insert 45 under the action of the spring 447, fixing the movable seat 44 in another position. By opening the second cylinder 441, the second cylinder 441 drives the second upper clamping plate 442 to move through the output end. The second upper clamping plate 442 fixes the longitudinal beam 3 between the second upper clamping plate 442 and the second lower clamping plate 443, thereby fixing both ends of the longitudinal beam 3 for easy welding.

[0041] When the movable frame 4 moves, it drives the telescopic cylinder 51 and the sleeve 52 to move, which in turn drives the rotating frame 54 to move. The rotating frame 54 then drives the two rotating plates 5 to move, thereby adjusting the distance between the two rotating plates 5. The front frame 32 is then fixed on the rotating plate 5 and interlocked with the longitudinal beam 3 or the cross beam 31. Since the connection angle of the front frame 32 may be different, it is sometimes necessary to adjust the angle of the front frame 32. By activating the second electric actuator 516, the output end of the second electric actuator 516 drives the rack 512 to move, which in turn drives the gear 511 to rotate. The telescopic cylinder 51 is driven to rotate by the gear 511. The telescopic cylinder 51 drives the sleeve 52 to rotate through the limit rod 53. The telescopic cylinder 51 and the sleeve 52 drive the rotating frame 54 to rotate. The rotating frame 54 drives the rotating plate 5 to rotate, thereby adjusting the angle of the rotating plate 5 until the front frame 32 on the rotating plate 5 is engaged with the crossbeam 31 or the longitudinal beam 3. The first electric push rod 55 is then activated. The first electric push rod 55 drives the first clamping plate 56 to move through its output end. When the first clamping plate 56 moves, it fixes the front frame 32 between the first clamping plate 56 and the second clamping plate 57. Once the fixing is completed, welding can begin.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pipe welding auxiliary mechanism, comprising a base (1), wherein a mounting seat (2) is fixedly connected to the bottom of the base (1), and movable frames (4) are provided on both sides of the mounting seat (2); characterized in that: Two moving rods (26) are fixedly connected to the inner side wall of the movable frame (4). Two bidirectional ball screws (25) are rotatably connected to the mounting base (2) through bearings. The moving rods (26) are threaded to both ends of the bidirectional ball screws (25). A first wheel (21) is fixedly connected to the middle of the bidirectional ball screws (25). A motor (24) is fixedly connected to the bottom of the mounting base (2). The output shaft of the motor (24) is rotatably connected to the mounting base (2) through bearings and is fixedly connected to a second wheel (22). A belt (23) is sleeved on the outer side of the two first wheels (21) and the second wheel (22). A support column (41) is fixedly connected to the bottom of both ends of the movable frame (4). A moving wheel (42) is installed at the bottom of the support column (41).

2. The pipe fitting welding auxiliary mechanism according to claim 1, characterized in that: Two rotating plates (5) are provided on one side of the movable frame (4), and a rotating frame (54) is fixedly connected to the bottom of each rotating plate (5); a telescopic cylinder (51) and a sleeve (52) are fixedly connected to one end of each rotating frame (54), and one end of each telescopic cylinder (51) and sleeve (52) is rotatably connected to the inner wall of the two movable frames (4); two limiting rods (53) are fixedly connected to the outer wall of each telescopic cylinder (51), and the limiting rods (53) and the telescopic cylinder (51) are slidably connected inside the sleeve (52); one end of each telescopic cylinder (51) is fixedly connected to the inner wall of the two movable frames (4); The end extends to the outside of the movable frame (4) and is fixedly connected to a gear (511); two fixed plates (513) are fixedly connected to the outer side wall of the movable frame (4), and a slide rod (514) is fixedly connected between the two fixed plates (513). A rack (512) is slidably connected to the slide rod (514) through two connecting plates (515). The gear (511) meshes with the rack (512); a second electric push rod (516) is fixedly connected to the side wall of the movable frame (4), and the output end of the second electric push rod (516) is fixedly connected to the rack (512).

3. A pipe welding assist mechanism according to claim 2, wherein: The bottom of each rotating plate (5) is fixedly connected to a first electric push rod (55), and the output end of each first electric push rod (55) is fixedly connected to a first clamping plate (56). Each rotating plate (5) has a rectangular opening, and the first clamping plate (56) is slidably connected in the rectangular opening. Each rotating plate (5) has a second clamping plate (57) fixedly connected to it, and a front frame (32) is provided between the first clamping plate (56) and the second clamping plate (57).

4. A pipe welding aid according to claim 3, wherein: Each of the movable frame (4) has a fixed seat (43) fixedly connected to one end near the rotating plate (5). Each of the fixed seats (43) has a first cylinder (431) fixedly connected to the top. Each of the first cylinders (431) has a first upper clamping plate (432) fixedly connected to the output end. Each of the fixed seats (43) has a first lower clamping plate (433) fixedly connected to the top. Each of the first upper clamping plate (432) and the first lower clamping plate (433) has a longitudinal beam (3). Multiple crossbeams (31) are inserted between the longitudinal beams (3).

5. The pipe fitting welding auxiliary mechanism according to claim 4, characterized in that: The movable frame (4) is slidably connected to a movable seat (44) at the end away from the rotating plate (5). A second cylinder (441) is fixedly connected to the top of the movable seat (44). A second upper clamping plate (442) is fixedly connected to the output end of the second cylinder (441). A second lower clamping plate (443) is fixedly connected to the movable seat (44). One end of the longitudinal beam (3) is located between the second upper clamping plate (442) and the second lower clamping plate (443).

6. A pipe welding aid according to claim 5, wherein: Each of the movable frame (4) has a sliding opening (46) at one end; each of the movable bases (44) has an L-shaped plate (444) fixedly connected to it, and each of the L-shaped plates (444) has a slidably connected insert post (445) connected to it. Each of the insert posts (445) has a pull plate (446) fixedly connected to one end, and each of the pull plate (446) and the L-shaped plate (444) has a spring (447) connected between them. Each of the movable frame (4) has multiple insertion slots (45), and each of the insert posts (445) is inserted through into the insertion slots (45).

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