An auxiliary positioning fixture for welding thermal pipelines

Abstract

This invention relates to the field of fixtures, specifically disclosing an auxiliary positioning fixture for welding thermal pipelines, comprising: a mounting frame, wherein a driving assembly is disposed inside the mounting frame and a mounting block is driven and connected to the mounting frame via the driving assembly; a turntable, wherein the turntable is fixedly mounted on the mounting block, and a mounting plate and a support plate for supporting the mounting plate are fixedly connected to the turntable; a second motor, wherein the second motor is fixedly mounted on the side wall of the mounting plate, and a second lead screw is fixedly connected to the end of the output shaft of the second motor, and a mounting disc is threadedly connected to the second lead screw; and a mechanical clamping arm, wherein the mechanical clamping arm is fixedly mounted on the side wall of the mounting plate. This invention, by setting a driving assembly, mounting block, turntable, and mechanical clamping arm on the mounting frame, allows the position of the mounting block to be adjusted via the driving assembly, and the tilt angle of the mechanical clamping arm to be adjusted via the turntable. The mechanical clamping arm is used to expand and support the pipeline, facilitating the operator to rotate the pipeline to be welded in any direction as needed.

Description

Technical Field

[0001] This invention belongs to the field of fixture technology, specifically relating to an auxiliary positioning fixture for welding thermal pipelines. Background Technology

[0002] In daily life and industry, heat energy is often needed. The medium for transferring heat energy is mostly liquid or gas, which needs to be transferred through heat pipes. Designers need to design heat pipes in various forms according to installation requirements, such as straight pipes or bends, and then weld different pipes together to form a heat pipe for transferring heat energy.

[0003] Chinese patent CN219818663U discloses an auxiliary positioning fixture for welding thermal pipelines. The fixture includes a base plate, a welding frame connected to the top of the base plate, a welding hole at the top of the welding frame, sliding rods connected to both sides of the welding frame, and clamping units slidably mounted at the ends of the sliding rods that are far apart from each other. A driving unit and a trimming unit are also connected to the top of the base plate. Each clamping unit includes a bottom clamping plate fixedly mounted at its top, a top clamping plate hinged to one side of the bottom clamping plate, and pressing rollers rotatably mounted on both sides of the bottom and top clamping plates, which are slidably connected to the sliding rods. Connecting plates are connected to one side of both the bottom and top clamping plates, and the connecting plates are connected by bolts and nuts. A slide rail is connected to the top of the base plate. This invention effectively improves welding efficiency, reduces labor consumption, ensures a smooth pipe surface, and guarantees welding results.

[0004] During the application process, the applicant discovered that the above-mentioned application has defects in use. Thermal pipelines need to be designed according to usage requirements and site conditions. Not only are straight pipes used for transportation, but there are also various curved pipes. When welding, the auxiliary tooling needs to be applicable not only to straight pipe welding, but also to curved pipe welding. However, the above-mentioned auxiliary positioning tooling can only be used to assist in straight pipe welding and cannot be applied to curved pipe welding, thus having a narrow scope of application. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary positioning fixture for welding thermal pipelines, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An auxiliary positioning fixture for welding thermal pipelines, comprising:

[0008] The mounting frame has a drive component inside, and the mounting block is connected to the drive component through the drive component.

[0009] A turntable, which is fixedly mounted on a mounting block, and a mounting plate and a support plate that supports the mounting plate are fixedly connected to the turntable;

[0010] The second motor is fixedly mounted on the side wall of the mounting plate, and the output shaft end of the second motor is fixedly connected to a second lead screw, and a mounting plate is threaded onto the second lead screw;

[0011] A mechanical clamping arm is fixedly mounted on the side wall of the mounting plate, and one end of the mechanical clamping arm is hinged to the mounting plate.

[0012] Preferably, the mechanical clamping arm includes a fixed mounting rod fixedly mounted on the side wall of the mounting plate, a support mounting rod hinged to the fixed mounting rod, and a movable mounting rod hinged to the end of the support mounting rod. A pull rod is hinged to the support mounting rod, and the end of the pull rod is hinged to the mounting plate.

[0013] Preferably, the movable mounting rod is provided with multiple sets of telescopic cylinders. One set of telescopic cylinders is fixedly installed on the movable mounting rod, and two sets of telescopic cylinders are respectively hinged to the side wall of the movable mounting rod. Each telescopic cylinder includes an outer cylinder, a telescopic rod slidably inserted into the end of the outer cylinder, and a spring disposed inside the outer cylinder. The two ends of the spring abut against the inner wall of the outer cylinder and the end of the telescopic rod, respectively. The outer cylinder of the middle telescopic cylinder is fixedly connected to the movable mounting rod, and the outer cylinders of the two side telescopic cylinders are hinged to the side wall of the movable mounting rod. A connecting plate is hinged between the telescopic rod of the middle telescopic cylinder and the outer cylinders of the two side telescopic cylinders.

[0014] Preferably, a stop block is fixedly connected to the side wall of the telescopic rod of the middle telescopic cylinder, and rollers are rotatably connected to the side walls of the telescopic rods of the two side telescopic cylinders. An air passage is opened inside the stop block. An arc-shaped telescopic air cylinder is fixedly connected between the support mounting rod and the movable mounting rod. A connecting pipe is fixedly connected to the end of the telescopic air cylinder. The end of the connecting pipe is fixedly connected to the stop block, and the connecting pipe communicates with the air passage.

[0015] Preferably, the turntable includes a disc body fixedly mounted on a mounting block, a disc plate rotatably connected to the disc body, and a worm gear fixedly mounted on the bottom of the disc plate. A worm gear meshing with the worm gear is rotatably connected to the side wall of the disc body.

[0016] Preferably, the drive assembly includes a first motor fixedly mounted on the side wall of the mounting bracket, a first lead screw fixedly mounted on the end of the output shaft of the first motor, and a transmission rod fixedly mounted on the inner wall of the mounting bracket. The end of the first lead screw is rotatably connected to the inner wall of the mounting bracket, the mounting block is threadedly connected to the first lead screw, and the mounting block is slidably connected to the transmission rod.

[0017] Preferably, the mounting bracket is T-shaped and has two sets of drive components, each of which drives a mechanical clamping arm, and the drive directions of the two sets of drive components are perpendicular to each other.

[0018] Preferably, there is a gap between the mounting bracket and the ground, and the bottom of the mounting block is rotatably connected to a roller.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This invention, by setting a drive assembly, a mounting block, a turntable, and a mechanical clamping arm on a mounting frame, allows the position of the mounting block to be adjusted by the drive assembly, and the tilt angle of the mechanical clamping arm to be adjusted by the turntable. The mechanical clamping arm is used to expand and support the pipe, making it easy for the operator to rotate the pipe to be welded in any direction as needed, so as to flexibly adjust the angle of the pipe to be welded.

[0021] The operator can also drive the second screw to rotate via the second motor, and the second screw will drive the mounting plate to move to adjust the outer diameter of the mechanical clamping arm, so that the mechanical clamping arm can clamp pipes of different diameters.

[0022] By setting the mounting bracket in a T-shape and installing two sets of drive components and two sets of mechanical clamping arms on the mounting bracket, after the two pipes are clamped by the mechanical clamping arms, the operator can control the distance between the two pipes through the drive components and adjust the orientation angle between the two pipes through the turntable, making it easy for the user to adjust the two pipes to be welded to the appropriate angle. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the connection structure between the mounting plate and the mechanical clamping arm of the present invention;

[0026] Figure 4 This is a schematic diagram of the mechanical clamping arm structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection structure between the movable mounting rod and the telescopic cylinder of the present invention;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the telescopic cylinder of the present invention;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the abutment block of the present invention;

[0030] Figure 8 This is a schematic diagram of the cross-sectional structure of the turntable of the present invention;

[0031] In the diagram: 1. Mounting frame; 2. First motor; 3. First lead screw; 4. Transmission rod; 5. Mounting block; 51. Roller; 6. Turntable; 61. Disc body; 62. Disc plate; 63. Worm gear; 64. Worm; 7. Mounting plate; 8. Support plate; 9. Second motor; 10. Second lead screw; 11. Mounting disc; 12. Fixed mounting rod; 13. Support mounting rod; 14. Moving mounting rod; 15. Pull rod; 16. Telescopic cylinder; 161. Outer cylinder; 162. Telescopic rod; 163. Spring; 17. Connecting plate; 18. Abutment block; 181. Air passage; 19. Roller; 20. Telescopic air cylinder; 21. Connecting pipe. Detailed Implementation

[0032] 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.

[0033] Example 1:

[0034] Please see Figure 1 - Figure 8 As shown, an auxiliary positioning fixture for welding thermal pipelines includes:

[0035] Mounting frame 1, the mounting frame 1 is provided with a driving component, and the mounting block 5 is connected to it through the driving component;

[0036] Turntable 6, which is fixedly mounted on mounting block 5, and mounting plate 7 and support plate 8 that support mounting plate 7 are fixedly connected to turntable 6;

[0037] The second motor 9 is fixedly installed on the side wall of the mounting plate 7, and the output shaft end of the second motor 9 is fixedly connected to the second lead screw 10, and the second lead screw 10 is threadedly connected to the mounting plate 11.

[0038] A mechanical clamping arm is fixedly installed on the side wall of the mounting plate 7, and one end of the mechanical clamping arm is hinged to the mounting plate 11.

[0039] As can be seen from the above, when the operator needs to weld a pipe with a bending angle, the pipe to be welded can be placed on the mechanical clamping arm, the second motor 9 is started to drive the lead screw 10 to rotate, the rotating lead screw 10 drives the mounting plate 11 to move, the moving mounting plate 11 causes the mechanical clamping arm to open, the open mechanical clamping arm clamps the pipe, after the pipe is positioned by the mechanical clamping arm, the position of the pipe can be adjusted by the drive component, and the angle of the mounting plate 7 can also be adjusted by the turntable 6, thereby adjusting the angle between the mechanical clamping arm and the pipe, so that the operator can adjust the pipe to a suitable angle for welding, which can meet the requirements of the user to weld the bent pipe.

[0040] The mechanical clamping arm includes a fixed mounting rod 12 fixedly mounted on the side wall of the mounting plate 7, a support mounting rod 13 hinged to the fixed mounting rod 12, and a movable mounting rod 14 hinged to the end of the support mounting rod 13. A pull rod 15 is hinged to the support mounting rod 13, and the end of the pull rod 15 is hinged to the mounting plate 11. A through hole is provided on the mounting plate 7, and the pull rod 15 passes through the through hole to penetrate the mounting plate 7.

[0041] The mounting plate 11, which moves along the axis of the second lead screw 10, will drive the pull rod 15 to move together. The moving pull rod 15 will drag the support mounting rod 13 to rotate. The rotating support mounting rod 13 will cause the moving mounting rod 14 to rotate. Since there are two support mounting rods 13 between the moving mounting rod 14 and the fixed mounting rod 12, the two support mounting rods 13 will keep the fixed mounting rod 12 and the moving mounting rod 14 parallel at all times. After the mechanical clamping arm is inserted into the pipe to be processed, the moving mounting rod 14, which moves outward, will abut against the inner wall of the pipe, so that the pipe to be processed will be stably stopped outside the mechanical arm.

[0042] The turntable 6 includes a disc body 61 fixedly mounted on the mounting block 5, a disc plate 62 rotatably connected to the disc body 61, and a worm gear 63 fixedly mounted on the bottom of the disc plate 62. A worm 64 that meshes with the worm gear 63 is rotatably connected to the side wall of the disc body 61.

[0043] When the operator needs to adjust the orientation of the pipe on the mechanical clamping arm, the worm 64 can be rotated. The worm 64 will drive the worm wheel 63 to rotate, and the worm wheel 63 will then drive the disc plate 62 to rotate. The disc plate 62 will drive the mounting plate 7, the mechanical clamping arm and the pipe to rotate, thereby adjusting the orientation of the pipe to the appropriate processing position.

[0044] The drive assembly includes a first motor 2 fixedly mounted on the side wall of the mounting frame 1, a first lead screw 3 fixedly mounted on the end of the output shaft of the first motor 2, and a transmission rod 4 fixedly mounted on the inner wall of the mounting frame 1. The end of the first lead screw 3 is rotatably connected to the inner wall of the mounting frame 1. The mounting block 5 is threadedly connected to the first lead screw 3, and the mounting block 5 is slidably connected to the transmission rod 4.

[0045] When the operator needs to adjust the position of the pipeline, the first motor 2 is started. The output shaft of the first motor 2 drives the first lead screw 3 to rotate. The rotating first lead screw 3 drives the mounting block 5 to slide on the first lead screw 3 and the transmission rod 4. The sliding mounting block 5 moves the pipeline to a suitable position for welding.

[0046] The mounting frame 1 is T-shaped and has two sets of drive components. Each of the two drive components drives a mechanical clamping arm, and the drive directions of the two drive components are perpendicular to each other. The operator can put the two pipes to be processed on the outside of the two mechanical clamping arms respectively, and then adjust the orientation of the two pipes to be processed simultaneously through the drive components, so that the operator can adjust the pipe processing position more flexibly.

[0047] There is a gap between the mounting frame 1 and the ground, and the bottom of the mounting block 5 is rotatably connected to a roller 51. During the movement of the mounting block 5, the roller 51 rolls on the ground, which can effectively reduce the friction between the mounting block 5 and the ground. In addition, there are gaps between the mounting frame 1 and the mounting block 5 and the ground, which makes it easy for operators to clean up the welding slag that falls on the ground.

[0048] Example 2:

[0049] Please see Figure 1 - Figure 8 As shown, an auxiliary positioning fixture for welding thermal pipelines includes:

[0050] Mounting frame 1, the mounting frame 1 is provided with a driving component, and the mounting block 5 is connected to it through the driving component;

[0051] Turntable 6, which is fixedly mounted on mounting block 5, and mounting plate 7 and support plate 8 that support mounting plate 7 are fixedly connected to turntable 6;

[0052] The second motor 9 is fixedly installed on the side wall of the mounting plate 7, and the output shaft end of the second motor 9 is fixedly connected to the second lead screw 10, and the second lead screw 10 is threadedly connected to the mounting plate 11.

[0053] A mechanical clamping arm is fixedly installed on the side wall of the mounting plate 7, and one end of the mechanical clamping arm is hinged to the mounting plate 11.

[0054] As can be seen from the above, when the operator needs to weld a pipe with a bending angle, the pipe to be welded can be placed on the mechanical clamping arm, the second motor 9 is started to drive the lead screw 10 to rotate, the rotating lead screw 10 drives the mounting plate 11 to move, the moving mounting plate 11 causes the mechanical clamping arm to open, the open mechanical clamping arm clamps the pipe, after the pipe is positioned by the mechanical clamping arm, the position of the pipe can be adjusted by the drive component, and the angle of the mounting plate 7 can also be adjusted by the turntable 6, thereby adjusting the angle between the mechanical clamping arm and the pipe, so that the operator can adjust the pipe to a suitable angle for welding, which can meet the requirements of the user to weld the bent pipe.

[0055] The mechanical clamping arm includes a fixed mounting rod 12 fixedly mounted on the side wall of the mounting plate 7, a support mounting rod 13 hinged to the fixed mounting rod 12, and a movable mounting rod 14 hinged to the end of the support mounting rod 13. A pull rod 15 is hinged to the support mounting rod 13, and the end of the pull rod 15 is hinged to the mounting plate 11. A through hole is provided on the mounting plate 7, and the pull rod 15 passes through the through hole to penetrate the mounting plate 7.

[0056] The mounting plate 11, which moves along the axis of the second lead screw 10, will drive the pull rod 15 to move together. The moving pull rod 15 will drag the support mounting rod 13 to rotate. The rotating support mounting rod 13 will cause the moving mounting rod 14 to rotate. Since there are two support mounting rods 13 between the moving mounting rod 14 and the fixed mounting rod 12, the two support mounting rods 13 will keep the fixed mounting rod 12 and the moving mounting rod 14 parallel at all times. After the mechanical clamping arm is inserted into the pipe to be processed, the moving mounting rod 14, which moves outward, will abut against the inner wall of the pipe, so that the pipe to be processed will be stably stopped outside the mechanical arm.

[0057] Multiple sets of telescopic cylinders 16 are provided on the movable mounting rod 14. One set of telescopic cylinders 16 is fixedly installed on the movable mounting rod 14, and two sets of telescopic cylinders 16 are respectively hinged to the side wall of the movable mounting rod 14. Each telescopic cylinder 16 includes an outer cylinder 161, a telescopic rod 162 slidably inserted into the end of the outer cylinder 161, and a spring 163 disposed inside the outer cylinder 161. The two ends of the spring 163 abut against the inner wall of the outer cylinder 161 and the end of the telescopic rod 162, respectively. The outer cylinder 161 of the middle telescopic cylinder 16 is fixedly connected to the movable mounting rod 14, and the outer cylinders 161 of the two side telescopic cylinders 16 are hinged to the side wall of the movable mounting rod 14. A connecting plate 17 is hinged between the telescopic rod 162 of the middle telescopic cylinder 16 and the outer cylinders 161 of the two side telescopic cylinders 16.

[0058] A stop block 18 is fixedly connected to the side wall of the telescopic rod 162 of the middle telescopic cylinder 16, and a roller 19 is rotatably connected to the side wall of the telescopic rod 162 of the two sides of the telescopic cylinder 16. An air passage 181 is opened inside the stop block 18. An arc-shaped telescopic air cylinder 20 is fixedly connected between the support mounting rod 13 and the movable mounting rod 14. A connecting pipe 21 is fixedly connected to the end of the telescopic air cylinder 20. The end of the connecting pipe 21 is fixedly connected to the stop block 18, and the connecting pipe 21 communicates with the air passage 181.

[0059] As the movable mounting rod 14 moves outward, the abutment block 18 first contacts the inner wall of the pipe. As the movable mounting rod 14 continues to move outward, the pipe compresses the telescopic cylinder 16 through the abutment block 18, causing the telescopic rod 162 to retract into the outer cylinder 161 and compress the spring 163. As the telescopic rod 162 of the middle telescopic cylinder 16 retracts into the outer cylinder 161, the telescopic rod 162 drives the connecting plate 17 to rotate. The rotating connecting plate 17 will push the telescopic cylinders 16 on both sides away from the movable mounting rod 14. At this time, the rollers 19 at the ends of the telescopic cylinders 16 on both sides will roll on the inner wall of the pipe. At the same time, the movement of the movable mounting rod 14 and the fixed mounting rod 12... As the distance increases, the telescopic air cylinder 20 will be passively pulled open by the mounting rod 14. At this time, the telescopic air cylinder 20 will suck away the air inside the air passage 181 through the connecting pipe 21, creating a negative pressure environment inside the air passage 181. This helps the abutment 18 to be firmly attached to the inner wall of the pipe, effectively reducing the probability of slippage between the pipe and the abutment 18. As the mechanical clamping arm is fully opened, there are three contact points between one mechanical clamping arm and the inner wall of the pipe. Three sets of mechanical arms are set on the side wall of the mounting plate 7. The pipe is sleeved on the outside of the three sets of mechanical arms. The three sets of mechanical arms have multiple contact points with the inner wall of the pipe to be processed, which can maintain the connection stability of the pipe and avoid pipe displacement during subsequent welding.

[0060] The turntable 6 includes a disc body 61 fixedly mounted on the mounting block 5, a disc plate 62 rotatably connected to the disc body 61, and a worm gear 63 fixedly mounted on the bottom of the disc plate 62. A worm 64 that meshes with the worm gear 63 is rotatably connected to the side wall of the disc body 61.

[0061] When the operator needs to adjust the orientation of the pipe on the mechanical clamping arm, the worm 64 can be rotated. The worm 64 will drive the worm wheel 63 to rotate, and the worm wheel 63 will then drive the disc plate 62 to rotate. The disc plate 62 will drive the mounting plate 7, the mechanical clamping arm and the pipe to rotate, thereby adjusting the orientation of the pipe to the appropriate processing position.

[0062] The drive assembly includes a first motor 2 fixedly mounted on the side wall of the mounting frame 1, a first lead screw 3 fixedly mounted on the end of the output shaft of the first motor 2, and a transmission rod 4 fixedly mounted on the inner wall of the mounting frame 1. The end of the first lead screw 3 is rotatably connected to the inner wall of the mounting frame 1. The mounting block 5 is threadedly connected to the first lead screw 3, and the mounting block 5 is slidably connected to the transmission rod 4.

[0063] When the operator needs to adjust the position of the pipeline, the first motor 2 is started. The output shaft of the first motor 2 drives the first lead screw 3 to rotate. The rotating first lead screw 3 drives the mounting block 5 to slide on the first lead screw 3 and the transmission rod 4. The sliding mounting block 5 moves the pipeline to a suitable position for welding.

[0064] The mounting frame 1 is T-shaped and has two sets of drive components. Each of the two drive components drives a mechanical clamping arm, and the drive directions of the two drive components are perpendicular to each other. The operator can put the two pipes to be processed on the outside of the two mechanical clamping arms respectively, and then adjust the orientation of the two pipes to be processed simultaneously through the drive components, so that the operator can adjust the pipe processing position more flexibly.

[0065] There is a gap between the mounting frame 1 and the ground, and the bottom of the mounting block 5 is rotatably connected to a roller 51. During the movement of the mounting block 5, the roller 51 rolls on the ground, which can effectively reduce the friction between the mounting block 5 and the ground. In addition, there are gaps between the mounting frame 1 and the mounting block 5 and the ground, which makes it easy for operators to clean up the welding slag that falls on the ground.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] The accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments disclosed in this invention. Other structures can be referred to with common designs. Unless otherwise specified, the same embodiment and different embodiments of this invention can be combined with each other.

Claims

1. An auxiliary positioning fixture for welding thermal pipelines, characterized in that, include: Mounting frame (1), the mounting frame (1) is provided with a drive assembly inside, and the mounting block (5) is connected to the drive assembly through the drive assembly. The mounting frame (1) is T-shaped, and two sets of drive assemblies are provided on the mounting frame (1). The two sets of drive assemblies drive a mechanical clamping arm respectively, and the drive directions of the two sets of drive assemblies are perpendicular to each other. Turntable (6), the turntable (6) is fixedly installed on the mounting block (5), and the turntable (6) is fixedly connected to the mounting plate (7) and the support plate (8) supporting the mounting plate (7). The second motor (9) is fixedly installed on the side wall of the mounting plate (7), and the output shaft end of the second motor (9) is fixedly connected to the second lead screw (10), and the second lead screw (10) is threadedly connected to the mounting plate (11). Mechanical clamping arm, the mechanical clamping arm is fixedly installed on the side wall of the mounting plate (7), and one end of the mechanical clamping arm is hinged to the mounting plate (11); The mechanical clamping arm includes a fixed mounting rod (12) fixedly mounted on the side wall of the mounting plate (7), a support mounting rod (13) hinged to the fixed mounting rod (12), and a movable mounting rod (14) hinged to the end of the support mounting rod (13). A pull rod (15) is hinged on the support mounting rod (13), and the end of the pull rod (15) is hinged to the mounting plate (11). Multiple sets of telescopic cylinders (16) are provided on the movable mounting rod (14). One set of telescopic cylinders (16) is fixedly mounted on the movable mounting rod (14), and two sets of telescopic cylinders (16) are respectively hinged to the side wall of the movable mounting rod (14). The telescopic cylinder (16) includes an outer cylinder (161), a telescopic rod (162) slidably inserted into the end of the outer cylinder (161), and a spring (163) disposed inside the outer cylinder (161). The two ends of the spring (163) abut against the inner wall of the outer cylinder (161) and the end of the telescopic rod (162) respectively. The outer cylinder (161) of the middle telescopic cylinder (16) is fixedly connected to the movable mounting rod (14), and the outer cylinder (161) of the two side telescopic cylinders (16) is hinged to the side wall of the movable mounting rod (14). A connecting plate (17) is hinged between the telescopic rod (162) of the middle telescopic cylinder (16) and the outer cylinder (161) of the two side telescopic cylinders (16). The telescopic cylinder (16) in the middle has a stop block (18) fixedly connected to the side wall of the telescopic rod (162) of the telescopic cylinder (16) on both sides, and rollers (19) are rotatably connected to the side walls of the telescopic rod (162) of the telescopic cylinder (16) on both sides. An air passage (181) is opened inside the stop block (18). An arc-shaped telescopic air cylinder (20) is fixedly connected between the support mounting rod (13) and the moving mounting rod (14). A connecting pipe (21) is fixedly connected to the end of the telescopic air cylinder (20). The end of the connecting pipe (21) is fixedly connected to the stop block (18), and the connecting pipe (21) is connected to the air passage (181).

2. The auxiliary positioning fixture for welding thermal pipelines according to claim 1, characterized in that: The turntable (6) includes a disc body (61) fixedly mounted on the mounting block (5), a disc plate (62) rotatably connected to the disc body (61), and a worm gear (63) fixedly mounted on the bottom of the disc plate (62). A worm (64) meshing with the worm gear (63) is rotatably connected to the side wall of the disc body (61).

3. The auxiliary positioning fixture for welding thermal pipelines according to claim 1, characterized in that: The drive assembly includes a first motor (2) fixedly mounted on the side wall of the mounting frame (1), a first lead screw (3) fixedly mounted on the end of the output shaft of the first motor (2), and a transmission rod (4) fixedly mounted on the inner wall of the mounting frame (1). The end of the first lead screw (3) is rotatably connected to the inner wall of the mounting frame (1). The mounting block (5) is threadedly connected to the first lead screw (3), and the mounting block (5) is slidably connected to the transmission rod (4).

4. The auxiliary positioning fixture for welding thermal pipelines according to claim 1, characterized in that: The mounting bracket (1) has a gap between itself and the ground, and the bottom of the mounting block (5) is rotatably connected to a roller (51).

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