Anti-deformation tool clamp for automatic welding of stainless steel pipe and clamping method

Abstract

The invention provides an anti-deformation tool clamp for automatic welding of stainless steel pipes and a clamping method, and relates to the technical field of steel pipe welding tool clamps. Two coaxial supporting moving assemblies are arranged on the inner clamping cylinder, sliding mounting holes are further formed in the inner clamping cylinder, a back shore supporting rod is arranged in each sliding mounting hole, and a supporting heat conduction block is fixedly arranged at the top of each back shore supporting rod; and a driving frustum and a frustum driving mechanism are arranged in the inner clamping cylinder. The anti-deformation tool clamp has the beneficial effects that the anti-deformation tool clamp can clamp and fix a steel pipe to be welded in an inner supporting mode through the supporting heat conduction blocks to prevent welding slippage deformation, all the supporting heat conduction blocks can form a heat conduction ring piece to conduct heat to a welding part, and welding thermal deformation is prevented; the anti-deformation tool clamp is suitable for steel pipes with different pipe diameters, so that the application range of the anti-deformation tool clamp is widened; under the condition that the supporting heat conduction block can adapt to steel pipes with different pipe diameters, the supporting and heat conduction effects of the supporting heat conduction block can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe welding fixtures, and in particular to an anti-deformation fixture and a clamping method for automatic welding of stainless steel pipes. Background Art

[0002] Stainless steel pipes are widely used in the petrochemical industry, food processing, medical equipment, aerospace, and other fields due to their strong corrosion resistance, high strength, and hygienic and environmentally friendly properties. Welding is a core process in the manufacture and installation of stainless steel pipes, but weld deformation remains a key bottleneck restricting product quality and production efficiency.

[0003] A Chinese patent application number CN202410560579.0 discloses a tool clamp for welding steel pipes, which includes: a placement table, a double-ended screw, a first motor fixedly connected to the placement table, a threaded sleeve threadedly connected to the double-ended screw, the output shaft of the first motor and the surface of the double-ended screw are fixedly connected with a first bevel gear that meshes with each other, and also includes a clamping mechanism and a clamping force adjustment mechanism, and the clamping mechanism is arranged on the threaded sleeve; in the present invention, the clamping mechanism uses multiple contact parts to simultaneously perform multi-point positioning in the steel pipe, so that the steel pipe and the clamping mechanism are in a connected state, and at the same time, under the action of the gravity of the steel pipe itself, the height can be automatically adjusted, and the steel pipe can be stably placed on the support plate. Under the action of two mounting rings and the support plate at the same horizontal height, the two steel pipes to be welded are adjusted to a concentric and non-deviation state, reducing the difficulty of steel pipe docking and improving the accuracy of their docking.

[0004] The main causes of stainless steel welding deformation include thermal stress, shrinkage stress, and insufficient restraint (causing slip). When welding stainless steel pipes, the high temperature causes local expansion of the pipe, and upon cooling, the metal contracts, generating internal stress. Steel pipes are long and narrow, and shrinkage stress can easily cause bending (deflection due to longitudinal contraction) or twisting (torsion due to uneven transverse contraction). Thinner walls and larger diameters result in reduced rigidity and increased susceptibility to deformation. Large-diameter, thin-walled pipes also suffer from poor structural strength (due to increased heat during welding, which reduces strength). Externally clamping these pipes can easily cause localized concavity in the stainless steel pipe, further exacerbating welding deformation in stainless steel pipes.

[0005] Existing steel pipe welding fixtures are difficult to solve the problem of thermal deformation during stainless steel welding. At the same time, existing steel pipe welding fixtures mostly adopt an external clamping method and can generally only clamp steel pipes of a specific diameter. This will result in poor versatility and difficulty in clamping steel pipes with large diameters and thin walls. The clamping can easily cause the welding end to concave. In addition, in the existing steel pipe welding process, the welding gun needs to move along the welding gap, and the external clamping method will affect the installation and movement of the welding gun. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an anti-deformation fixture for automatic welding of stainless steel pipes, which can not only clamp and fix the steel pipe to be welded by means of internal support using the supporting heat-conducting blocks to prevent welding slip deformation, but also conduct heat to the welding part through the heat-conducting ring formed by all the supporting heat-conducting blocks to prevent welding thermal deformation. The anti-deformation fixture can prevent slip deformation and thermal deformation during steel pipe welding while also being able to adapt to steel pipes of different diameters to increase its scope of use. While the supporting heat-conducting blocks can adapt to steel pipes of different diameters, they can also ensure the support and heat conduction effects of the supporting heat-conducting blocks. The anti-deformation fixture can quickly complete the docking and clamping process of the two steel pipes to be welded, and can drive the steel pipe to be welded to rotate after clamping, which can improve the clamping and welding efficiency.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: an anti-deformation fixture for automatic welding of stainless steel pipes, used for internally supporting and clamping two steel pipes to be welded, including an internal clamping cylinder; Two coaxial supporting and moving assemblies are provided on the inner clamp, each of which includes a plurality of moving bracket mechanisms evenly arranged around the inner clamp; the two coaxial supporting and moving assemblies are used to coaxially install the inner clamp in the steel pipe to be welded and drive the inner clamp to move in the steel pipe to be welded; The inner clamping tube is also provided with a plurality of sliding mounting holes, each of which is provided with a top support rod which is slidably arranged along the diameter of the inner clamping tube, and a supporting heat conducting block is fixed on the top of each top support rod; A driving cone and a cone driving mechanism are provided in the inner clamping cylinder. The driving cone is coaxially arranged in the inner clamping cylinder. A plurality of driving inclined plane grooves are provided on the driving cone. The bottom of each supporting rod is slidingly limited in a driving inclined plane groove. A first heat conducting sheet is fixedly provided on the top of the supporting heat conducting block, and a sliding expansion slot is further provided on the side of the supporting heat conducting block. A second heat conducting sheet is slidably provided in the sliding expansion slot, and an end portion of the second heat conducting sheet is fixed on an adjacent supporting heat conducting block, and the first heat conducting sheet and the second heat conducting sheet are slidably fitted together; The frustum driving mechanism is used to drive the frustum to move along its axial direction, so that the top support rod expands outward, thereby supporting the heat conducting block to internally support and fix the ends of the two steel pipes to be welded.

[0008] Furthermore, it also includes an outer bracket, on which a plurality of arc-shaped support arms are provided, and on each arc-shaped support arm a plurality of universal balls are provided at intervals.

[0009] Furthermore, the movable support mechanism includes a rotating support rod and a hydraulic cylinder; One end of the rotating support rod is rotatably arranged on the internal clamping cylinder, and the other end of the rotating support rod is provided with a fixed plate, and the fixed plate is provided with a rotating roller, and the rotating roller is rotatably arranged on the fixed plate; One end of the hydraulic cylinder is rotatably mounted on the inner clamping barrel, and the other end is rotatably connected to the middle of the rotating support rod. The hydraulic cylinder is used to adjust the distance between the rotating roller and the axis of the inner clamping barrel.

[0010] Furthermore, a rotation drive motor is provided in the inner clamping barrel, and a counterweight block with a disc structure is provided on the output shaft of the rotation drive motor. The rotation drive motor and the counterweight block are both coaxially arranged with the inner clamping barrel.

[0011] Furthermore, a movable drive motor is provided on at least one fixed plate of the movable bracket mechanism, and an output shaft of the movable drive motor passes through the fixed plate and is connected to the rotating roller, and the movable drive motor is used to drive the rotating roller to rotate.

[0012] Furthermore, the supporting heat-conducting block includes an elastic heat-conducting block, which is connected to the top of the top support rod. The outer surface of the elastic heat-conducting block is an arc-shaped fitting surface. The first heat-conducting sheet is an arc-shaped plate and is tightly installed on the arc-shaped fitting surface. The arc-shaped fitting surface is also provided with a sliding expansion groove, and the second heat-conducting sheet is slidingly arranged in the sliding expansion groove.

[0013] Furthermore, a welding avoidance groove is provided in the middle of the first heat conducting plate, and the welding avoidance groove is aligned with the welding gap between the two ends to be welded.

[0014] Furthermore, a fitting slide rail groove is provided in the elastic heat-conducting block, and a limit installation groove communicating with the fitting slide rail groove is provided on the inner surface of the elastic heat-conducting block; A V-shaped elastic support frame is also provided on the top of the top support rod. The elastic support frame includes two elastic support plates. The ends of the two elastic support plates are provided with sliding shafts. The sliding limits of the ends of the elastic support plates are located in the limiting installation grooves, and the sliding shafts are limited in the fitting slide rail grooves.

[0015] Furthermore, the first heat conducting sheet and the second heat conducting sheet are both made of copper or aluminum sheets, and the elastic heat conducting block is made of heat conducting silica gel.

[0016] A method for anti-deformation clamping for automatic welding of stainless steel pipes, using the above-mentioned anti-deformation fixture, comprises the following steps: S1: Coaxially support the two steel pipes to be welded on an outer bracket, and adjust the distance between the two steel pipes to be welded so that the ends of the two steel pipes to be welded close to each other form a welding gap of a predetermined distance; S2: Place the inner clamp into the steel pipe to be welded, and control the telescopic rods of all hydraulic cylinders to extend and retract synchronously until the rotating rollers at the ends of all rotating support rods abut against the inner wall of the inner clamp, so that the inner clamp is coaxial with the steel pipe to be welded; S3: Move the inner clamp and adjust the position of the inner clamp in the steel pipe to be welded so that all the supporting heat conducting blocks are aligned with the welding gap; S4: Controlling the frustum driving mechanism to drive the frustum to move along its axis, so that the top support rod extends outward until the supporting heat conductive block on the top of the top support rod simultaneously abuts against the ends of the two steel pipes to be welded, thereby fixing the two steel pipes to be welded; S5: Control the rotation drive motor to drive the counterweight block to rotate. The reaction force of the rotation of the counterweight block drives the internal clamping cylinder and the two steel pipes to be welded to rotate on the outer bracket, so that the fixed welding gun completes the welding of the entire circular welding gap.

[0017] The beneficial effects of the anti-deformation fixture and clamping method for automatic welding of stainless steel pipes of the present invention are as follows: (1) The inner clamp of the anti-deformation fixture is provided with a plurality of top support rods, the top of the top support rod is provided with a support heat conductive block, the inner clamp is provided with a driving cone and a cone driving mechanism, the driving cone is provided with a plurality of driving inclined grooves, the bottom sliding limit of each top support rod is located in a driving inclined groove, and the outer wall of the inner clamp is provided with a coaxial support moving component; when the inner clamp is placed in two coaxially arranged steel pipes to be welded and the welding gap is adjusted, the coaxial support moving component can keep the inner clamp coaxial with the steel pipes to be welded, and move the inner clamp in the steel pipes to be welded so that the support heat conductive block is aligned with the welding gap; after the support heat conductive block is aligned with the welding gap, the cone driving mechanism can drive the driving cone to move, so that the bottom of the top support rod moves along the driving inclined groove The groove moves, causing the top support rod to expand outward, so that the support heat conductive block on the top of the top support rod can internally support and clamp the two steel pipes to be welded, ensuring that the two steel pipes to be welded will not move relative to each other during welding, and preventing the steel pipes from slipping and deforming during welding; and the outer wall of the support heat conductive block is fixed with a first heat conductive plate and a second heat conductive plate, the first heat conductive plate is tightly attached to the supported welding steel pipe, and the second heat conductive plate is attached to and connected to the adjacent first heat conductive plates, so that a heat conductive ring composed of the first heat conductive plate and the second heat conductive plate is formed in the welding gap between the two steel pipes to be welded, ensuring that the heat generated by welding can be conducted along the entire heat conductive ring and diffused quickly, and the high temperature of the welding part is used to preheat the welding part, reducing the temperature gradient of the local high temperature area, thereby reducing thermal stress and shrinkage stress. The heat conductive ring can also improve the thermal environment of the welding part, making the temperature distribution of the welding area more uniform, and reducing welding thermal deformation caused by uneven temperature. The anti-deformation fixture can not only use the supporting heat-conducting blocks to clamp and fix the steel pipe to be welded by means of internal support to prevent welding slip deformation, but also enable all the supporting heat-conducting blocks to form a heat-conducting ring to conduct heat to the welding part, thereby preventing welding thermal deformation.

[0018] (2) The coaxial support moving assembly on the inner clamp of the anti-deformation fixture includes multiple rotating rods and multiple hydraulic cylinders. The ends of the rotating rods are provided with rotating rollers. The hydraulic cylinders can adjust the distance between all the rotating rollers and the axis of the inner clamp by synchronous extension and contraction, so that the rotating rollers are supported on the inner wall of the steel pipes to be welded with different diameters. In this way, the coaxial support moving assembly can ensure that the inner clamp can maintain coaxiality with the steel pipes to be welded with different diameters. The supporting heat conducting block of the anti-deformation fixture is fixed on the top of the top supporting rod. The top supporting rod can be synchronously extended and contracted under the drive of the cone, and the second heat conducting plate is slidably arranged on the inner side of the first heat conducting plate. When the top supporting rod is synchronously extended and contracted, the first heat conducting plate and the second heat conducting plate can slide relative to each other, so that the diameter of the heat conducting ring plate composed of all the heat conducting plates can be adjusted, thereby adapting to the welding clamping of steel pipes with different diameters. The anti-deformation fixture can prevent slippage and thermal deformation during steel pipe welding while also adapting to steel pipes with different diameters, thereby improving its scope of use.

[0019] (3) The supporting heat conductive block includes an elastic heat conductive block with a fitting slide groove, an inner surface of the elastic heat conductive block with a limit installation groove connected to the fitting slide groove, an outer surface of the elastic heat conductive block is an arc-shaped fitting surface, the first heat conductive sheet is an arc-shaped plate, and the first heat conductive sheet is tightly installed on the arc-shaped fitting surface. The top of the top support rod is also provided with an elastic support frame with a V-shaped structure, the elastic support frame includes two elastic support plates, and the ends of the two elastic support plates are provided with sliding shaft rods. The sliding limit of the end of the elastic support plate is located in the limit installation groove, and the sliding limit of the sliding shaft rod is located in the fitting slide groove. When the curvature of the inner wall of the steel pipe to be welded is smaller than the curvature of the first heat conducting plate and the elastic heat conducting block (i.e., when the diameter of the steel pipe to be welded is too large), the two elastic support plates of the V-shaped elastic support frame will expand outward while the heat conducting block supports the steel pipe to be welded, causing the ends of the elastic support plates to slide outward within the fitting slide rail grooves. This will cause the elastic heat conducting block and the first heat conducting plate to deform, causing their ends to expand outward, thereby allowing the first heat conducting plate on the elastic heat conducting block to fully fit the inner wall of the steel pipe to be welded, thereby improving the support and heat conduction effect of the heat conducting block. While this support heat conducting block can adapt to steel pipes of different diameters, it can also ensure the support and heat conduction effect of the heat conducting block.

[0020] (4) The anti-deformation fixture also includes an outer bracket, which is provided with a plurality of arc-shaped support arms. Each arc-shaped support arm is provided with a plurality of universal balls at intervals. The universal balls on the plurality of arc-shaped support arms are aligned with each other, and the outer wall of the steel pipe to be welded is supported on the universal balls. A rotating drive motor is also provided in the inner clamp, and a counterweight block with a disc structure is provided on the output shaft of the rotating drive motor. The rotating drive motor and the counterweight block are both coaxially arranged with the inner clamp. The curvatures of the plurality of arc-shaped support arms are the same. When the steel pipe to be welded is supported on the universal balls on the arc-shaped support arms, the coaxiality of the steel pipe to be welded can be ensured. The universal balls can ensure that the steel pipe to be welded supported thereon can not only move axially but also rotate circumferentially, so that the welding distance between the two steel pipes to be welded can be adjusted conveniently. At the same time, the rotating drive motor drives the counterweight block to rotate. The reverse force of the counterweight block can be used to drive the two steel pipes to be welded clamped by the inner clamp to rotate under the outer bracket, so as to ensure that the fixed welding gun completes the welding of the entire circular welding gap. The anti-deformation fixture can quickly complete the butt-jointing clamping process of two steel pipes to be welded, and can drive the clamped steel pipes to be welded to rotate, thereby improving the clamping and welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the anti-deformation fixture body for automatic welding of stainless steel pipes according to an embodiment of the present invention.

[0022] Figure 2 The figure is a schematic structural diagram of a movable bracket mechanism of an anti-deformation fixture for automatic welding of stainless steel pipes according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the installation structure of the steel pipe to be welded when the embodiment of the present invention is working.

[0024] Figure 4 It is a structural schematic diagram of an anti-deformation fixture body for automatic welding of stainless steel pipes according to an embodiment of the present invention, in which the inner support clamps and fixes the steel pipe to be welded.

[0025] Figure 5 It is a left view of the main body of the anti-deformation fixture for automatic welding of stainless steel pipes according to an embodiment of the present invention.

[0026] Figure 6 yes Figure 5 Cross-sectional view at AA in the middle (supporting thermal block omitted).

[0027] Figure 7 yes Figure 5 Enlarged view of point B in the middle.

[0028] Figure 8 It is a schematic diagram of the partial structure of the main body of the anti-deformation fixture for automatic welding of stainless steel pipes according to an embodiment of the present invention.

[0029] Figure 9 yes Figure 8 Enlarged view of point C in the middle.

[0030] Figure 10 This is an anti-deformation fixture for automatic welding of stainless steel pipes according to the present invention. Schematic diagram of the elastic support frame expanding outward to support the heat conductive block to fit the inner wall of the steel pipe to be welded.

[0031] Figure 11 The present invention is a flow chart of the anti-deformation clamping method for automatic welding of stainless steel pipes.

[0032] In the above figure: 100 - internal clamping cylinder, 101 - receiving slot, 200 - mobile bracket mechanism, 201 - rotating support rod, 202 - fixed plate, 203 - mobile drive motor, 204 - rotating roller, 210 - hydraulic cylinder, 211 - rotating mounting plate, 300 - driving cone, 301 - first fixed plate, 302 - fixed support leg, 303 - electric push rod, 304 - driving inclined groove, 305 - follow-up limit groove, 400 - top support rod, 401 - elastic support plate, 402 - sliding Shaft, 410-embedded slider, 411-follow-up block, 500-support heat conducting block, 501-fitting slide rail groove, 502-limiting mounting groove, 503-sliding telescopic groove, 510-first heat conducting plate, 511-welding avoidance groove, 520-second heat conducting plate, 600-rotating drive motor, 601-second fixed plate, 602-limiting guide rod, 603-counterweight block, 700-steel pipe to be welded, 701-welding gap, 800-external bracket, 801-arc support arm, 802-universal ball. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0034] Although the steps in the present invention are arranged with numbers, they are not intended to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0035] Please refer to Figures 1 to 10 The present invention discloses an anti-deformation fixture for automatic welding of stainless steel pipes, which is used for internally supporting and clamping two steel pipes 700 to be welded, and includes an internal clamping cylinder 100 and an external bracket 800.

[0036] The outer bracket 800 is provided with a plurality of arc-shaped support arms 801 , and each arc-shaped support arm 801 is provided with a plurality of universal balls 802 at intervals, and the curvatures of the plurality of arc-shaped support arms 801 are the same.

[0037] The inner collet 100 is cylindrical and has multiple receiving slots 101 extending through its sidewall. Two coaxial support and movement assemblies are installed on the inner collet 100. Each coaxial support and movement assembly includes multiple movable support mechanisms 200 evenly spaced around the inner collet 100. The movable support mechanisms 200 are mounted within the receiving slots 101. These two coaxial support and movement assemblies support the inner collet 100, coaxially mounting it within the steel pipe 700 to be welded, and driving the inner collet 100 to move within the pipe 700.

[0038] The inner wall of the inner clamp 100 is also provided with a plurality of penetrating sliding mounting holes, all of which are evenly arranged around the axis of the inner clamp 100. Each sliding mounting hole is provided with a top support rod 400 that can be radially slid along the inner clamp 100, and a supporting heat conductive block 500 is fixed on the top of each top support rod 400.

[0039] The inner collet 100 includes a driving cone 300 and a cone driving mechanism. The driving cone 300 is coaxially disposed within the inner collet 100 and is provided with a plurality of driving bevel grooves 304. The bottom of each supporting rod 400 is slidably restrained within a driving bevel groove 304. Specifically, an embedded slider 410 is provided at the bottom of the supporting rod 400. The embedded slider 410 slidably engages within the driving bevel groove 304. The sidewalls of the driving bevel groove 304 also include a follower stopper 411 that slidably restrains within the follower stopper groove 305. This allows the bottom of the supporting rod 400 to slide within the driving bevel groove 304 without disengaging during the movement of the driving cone 300. Furthermore, the driving cone 300 can drive all supporting rods 400 to synchronously extend and retract radially along the inner collet 100 during movement.

[0040] A first thermally conductive sheet 510 is fixedly provided on the top of the supporting thermally conductive block 500, and a sliding expansion groove 503 is also provided on the side of the supporting thermally conductive block 500. A second thermally conductive sheet 520 is slidably provided in the sliding expansion groove 503. The end of the second thermally conductive sheet 520 is fixed on the adjacent supporting thermally conductive block 500, and the first thermally conductive sheet 510 and the second thermally conductive sheet 520 slide and fit together; when the supporting thermally conductive block 500 moves with the top support rod 400, the second thermally conductive sheet 520 can slide in the sliding expansion groove 503, and the second thermally conductive sheet 520 can always fit together with the first thermally conductive sheet 510 connecting the tops of the two adjacent supporting thermally conductive blocks 500.

[0041] The frustum drive mechanism is used to drive the frustum 300 along its axial direction, causing the supporting rods 400 to expand outward, thereby supporting the heat conductive block 500 to internally support and secure the two welded ends of the steel pipes 700. In this embodiment, the frustum drive mechanism is an electric push rod 303, which is fixedly connected to the first fixed plate 301. The first fixed plate 301 is fixed to the inner wall of the internal chuck 100 via fixed legs 302.

[0042] When the anti-deformation fixture is in use, the two steel pipes 700 to be welded are coaxially supported on the arc-shaped support arm 801 on the outer bracket 800, the universal balls 802 are symmetrically arranged on the arc-shaped support arm 801, and the universal balls 802 on the multiple arc-shaped support arms 801 are aligned one by one to ensure that the two steel pipes 700 to be welded can be coaxial; the universal balls 802 can ensure that the steel pipes 700 to be welded supported thereon can not only move axially but also rotate circumferentially, which can facilitate the adjustment of the welding distance between the two steel pipes 700 to be welded.

[0043] After the two steel pipes 700 to be welded have adjusted the welding gap 701, the inner clamp 100 is placed into the two coaxially arranged steel pipes 700 to be welded, and the coaxial support moving assembly keeps the inner clamp 100 coaxial with the steel pipes 700 to be welded, and the inner clamp 100 is moved to align the supporting heat conductive block 500 arranged in the annular structure with the welding gap 701; after the supporting heat conductive block 500 is aligned with the welding gap 701, the frustum driving mechanism drives the driving frustum 300 to move, so that the bottom of the top support rod 400 moves along the driving inclined groove 304, so that the top support rod 400 expands outward, so that the supporting heat conductive block 500 on the top of the top support rod 400 can internally support and clamp the two steel pipes to be welded. The pipe 700 ensures that the two steel pipes 700 to be welded will not move relative to each other during the welding process, preventing the steel pipes from slipping and deforming during the welding process. In addition, the outer wall of the supporting heat conducting block 500 is fixedly provided with a first heat conducting plate 510 and a second heat conducting plate 520. The first heat conducting plate 510 is tightly attached to the supporting welded steel pipe 700, and the second heat conducting plate 520 is connected to the adjacent first heat conducting plates 510. In this way, a heat conducting ring is formed in the welding gap 701 between the two steel pipes 700 to be welded, ensuring that the heat generated by the welding can be conducted along the entire heat conducting ring and quickly diffused. The high temperature of the welding part is used to preheat the welded part, reducing the temperature gradient in the local high temperature area, thereby reducing thermal stress and shrinkage stress. The heat conducting ring can also improve the thermal environment of the welded part, making the temperature distribution in the welded area more uniform and reducing deformation caused by uneven temperature. The anti-deformation fixture can not only use the supporting heat-conducting blocks 500 to clamp and fix the steel pipe 700 to be welded by means of internal support to prevent welding slippage and deformation, but also enable all the supporting heat-conducting blocks 500 to form a heat-conducting ring to conduct heat to the welding part, thereby preventing welding thermal deformation.

[0044] In a preferred embodiment, the movable support mechanism 200 includes a rotating support rod 201 and a hydraulic cylinder 210; one end of the rotating support rod 201 is rotatably mounted on the internal clamping barrel 100, and the other end of the rotating support rod 201 is provided with a fixed plate 202, and the fixed plate 202 is provided with a rotating roller 204, and the rotating roller 204 is rotatably mounted on the fixed plate 202; One end of the hydraulic cylinder 210 is rotatably mounted on the inner collet 100 via a rotating mounting plate 211, and the other end is rotatably connected to the middle portion of the rotating support rod 201. The hydraulic cylinder 210 is used to adjust the distance between the rotating roller 204 and the axis of the inner collet 100. In this embodiment, all hydraulic cylinders 210 extend and retract synchronously, allowing the movable support mechanism 200 to ensure that the inner collet 100 remains coaxial with the steel pipe 700 to be welded with different diameters.

[0045] A mobile drive motor 203 is mounted on at least one fixed plate 202 of the mobile support mechanism 200. The output shaft of the mobile drive motor 203 passes through the fixed plate 202 and is connected to a rotating roller 204. The mobile drive motor 203 is used to drive the rotating roller 204. The mobile drive motor 203 is used to drive the internal collet 100 to move within the steel pipe 700 to be welded.

[0046] The supporting heat conducting block 500 comprises an elastic heat conducting block connected to the top of the supporting rod 400. The outer surface of the elastic heat conducting block is an arcuate fitting surface. The first heat conducting sheet 510 is a curved plate and is tightly mounted on the curved fitting surface. The curved fitting surface is also provided with a sliding expansion slot 503, and the second heat conducting sheet 520 is slidably mounted within the sliding expansion slot 503. A welding avoidance slot 511 is provided in the middle of the first heat conducting sheet 510, which is aligned with the welding gap 701 between the two ends to be welded. A fitting slide groove 501 is provided in the elastic heat conductive block, and a limit installation groove 502 connected to the fitting slide groove 501 is provided on the inner surface of the elastic heat conductive block; a V-shaped elastic support frame is also provided on the top of the top support rod 400, and the elastic support frame includes two elastic support plates 401, and sliding shafts 402 are provided at the ends of the two elastic support plates 401. The ends of the elastic support plates 401 are limited in the limiting installation groove 502, and the sliding shafts 402 are limited in the fitting slide groove 501.

[0047] In the above structure, the first and second thermally conductive sheets 510, 520 are both copper or aluminum sheets, while the elastic thermally conductive block is thermally conductive silicone. Copper or aluminum sheets have beneficial thermal conductivity, their sheet-like structure offers good elasticity, while the thermally conductive silicone offers excellent thermal conductivity and heat resistance. The coordinated structure of the elastic thermally conductive block and the first thermally conductive sheet 510 ensures that the supporting thermally conductive block 500 has both high elasticity and good thermal conductivity, while maintaining a certain thickness (to accommodate the sliding second thermally conductive sheet 520).

[0048] The hydraulic cylinder 210 of the anti-deformation fixture can adjust the axial distance of all rotating rollers 204 relative to the internal clamp 100 by synchronous telescopic means, so that the rotating rollers 204 are supported on the inner walls of the steel pipes 700 to be welded with different diameters. In this way, the coaxial support moving assembly can ensure that the internal clamp 100 can remain coaxial with the steel pipes 700 to be welded with different diameters. The supporting heat-conducting block 500 of the anti-deformation fixture is fixed on the top of the top support rod 400, and the top support rod 400 can be synchronously extended and retracted under the drive of the driving cone 300, and the second heat-conducting plate 520 is slidably arranged on the inner side of the first heat-conducting plate 510. When the top support rod 400 is synchronously extended and retracted, the first heat-conducting plate 510 and the second heat-conducting plate 520 can slide relative to each other, so that the diameter of the heat-conducting ring plate composed of all the heat-conducting plates can be adjusted, thereby adapting to the welding and clamping of steel pipes 700 with different diameters; the anti-deformation fixture can prevent the slip deformation and thermal deformation of the steel pipe 700 during welding, and can also adapt to steel pipes 700 with different diameters to improve its scope of use.

[0049] Furthermore, when the curvature of the inner wall of the steel pipe 700 to be welded is smaller than the curvature of the first heat conducting sheet 510 and the elastic heat conducting block (i.e., when the diameter of the steel pipe 700 to be welded is too large), the two elastic support plates 401 of the V-shaped elastic support frame will expand outward during the process of supporting the steel pipe 700 to be welded, causing the ends of the elastic support plates 401 to slide outward within the fitting slide groove 501. This will cause the elastic heat conducting block and the first heat conducting sheet 510 to deform, causing their ends to expand outward, thereby allowing the first heat conducting sheet 510 on the elastic heat conducting block to fully fit the inner wall of the steel pipe 700 to be welded, thereby improving the support and heat conduction effect of the heat conducting block 500. While the heat conducting block 500 can adapt to steel pipes 700 of different diameters, it can also ensure the support and heat conduction effect of the heat conducting block 500.

[0050] The internal collet 100 is also equipped with a rotational drive motor 600, which is fixed to a second fixed plate 601. The second fixed plate 601 is also fixed to the inner wall of the internal collet 100 via fixed legs 302. A limiting guide rod 602 is also provided on the second fixed plate 601. The driving cone 300 is also provided with a limiting hole. The limiting guide rod 602 can be slidably inserted into the limiting hole to ensure the stability of the driving cone 300. A counterweight 603 with a circular disc structure is installed on the output shaft of the rotational drive motor 600. The rotational drive motor 600 and the counterweight 603 are both coaxially arranged with the internal collet 100.

[0051] When the anti-deformation fixture is in use, when the steel pipe 700 to be welded is supported on the universal ball 802 on the arc-shaped support arm 801, the coaxiality of the steel pipe 700 to be welded can be ensured, and the universal ball 802 can ensure that the steel pipe 700 to be welded supported thereon can not only move axially but also rotate circumferentially; in this way, the rotation drive motor 600 drives the counterweight block 603 to rotate, and the reverse force of the rotation of the counterweight block 603 can be used to drive the two steel pipes 700 to be welded, which are clamped by the internal clamping cylinder 100, to rotate under the outer bracket 800, ensuring that the fixed welding gun completes the welding of the entire circular welding gap 701. The anti-deformation fixture can quickly complete the docking and clamping process of the two steel pipes 700 to be welded, and can drive the clamped steel pipes 700 to be welded to rotate, which can improve the clamping and welding efficiency.

[0052] In a preferred embodiment, a welding avoidance groove 511 is provided in the middle of the first heat conducting plate 510, and the welding avoidance groove 511 is aligned with the welding gap 701 between the two ends to be welded. The width of the welding avoidance groove 511 is greater than the width of the welding gap 701. This can prevent welding slag from falling onto the first heat conducting plate 510 during welding, causing damage to the first heat conducting plate 510 or adhesion to the weld.

[0053] refer to Figure 11 , the anti-deformation clamping method of the present invention uses the above-mentioned anti-deformation fixture, and the method includes the following steps: S1: coaxially supporting the two steel pipes 700 to be welded on the outer bracket 800, adjusting the distance between the two steel pipes 700 to be welded so that the ends of the two steel pipes 700 to be welded are close to each other to form a welding gap 701 with a predetermined distance; S2: placing the inner clamp 100 into the steel pipe 700 to be welded, and controlling the telescopic rods of all hydraulic cylinders 210 to synchronously extend and retract until the rotating rollers 204 at the ends of all rotating support rods 201 are against the inner wall of the inner clamp 100, so that the inner clamp 100 is coaxial with the steel pipe 700 to be welded; S3: moving the inner clamp 100, adjusting the position of the inner clamp 100 in the steel pipe 700 to be welded, so that all supporting heat conductive blocks 500 are aligned with the welding gap 701; S4: Control the cone driving mechanism to drive the cone 300 to move along its axis, so that the top support rod 400 extends outward until the supporting heat conductive block 500 on the top of the top support rod 400 simultaneously abuts against the ends of the two steel pipes 700 to be welded, so as to fix the two steel pipes 700 to be welded; S5: Control the rotating drive motor 600 to drive the counterweight block 603 to rotate, and the reaction force of the rotation of the counterweight block 603 drives the internal clamp 100 and the two steel pipes 700 to be welded to rotate on the outer bracket 800, so that the fixed welding gun completes the welding of the entire circular welding gap 701.

[0054] This clamping method can use a fixed welding gun to weld the circular welds of the two steel pipes 700 to be welded, avoiding the problem of interference between the welding gun and the external clamping fixture, while avoiding slip deformation and thermal deformation during the welding process, and improving welding efficiency and welding quality.

[0055] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended only for clarity and convenience in describing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0056] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0058] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended only for clarity and convenience in describing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0059] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-deformation fixture for automatic welding of stainless steel pipes, characterized by: including an internal collet (100); Two coaxial supporting movable assemblies are provided on the inner clamping barrel (100), and each coaxial supporting movable assembly includes a plurality of movable support mechanisms (200) evenly arranged around the inner clamping barrel (100); The inner clamping barrel (100) is also provided with a plurality of sliding mounting holes, each of which is provided with a supporting rod (400) that is radially slidable along the inner clamping barrel (100), and a supporting heat conducting block (500) is fixedly provided on the top of each supporting rod (400); A driving cone (300) and a cone driving mechanism are provided in the inner clamping cylinder (100). The driving cone (300) is coaxially arranged in the inner clamping cylinder (100). A plurality of driving inclined plane grooves (304) are provided on the driving cone (300). The bottom of each supporting rod (400) is slidably limited in a driving inclined plane groove (304). A first heat conducting sheet (510) is fixedly provided on the top of the supporting heat conducting block (500), a sliding telescopic groove (503) is further provided on the side of the supporting heat conducting block (500), a second heat conducting sheet (520) is slidably provided in the sliding telescopic groove (503), an end portion of the second heat conducting sheet (520) is fixed on an adjacent supporting heat conducting block (500), and the first heat conducting sheet (510) and the second heat conducting sheet (520) are slidably fitted together; The cone driving mechanism is used to drive the cone (300) to move along its axial direction, so that the top support rod (400) expands outward, thereby supporting the heat conductive block (500) to internally support and fix the ends of the two steel pipes (700) to be welded.

2. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 1, characterized in that: The outer bracket (800) is provided with a plurality of arc-shaped support arms (801), and a plurality of universal balls (802) are provided on each arc-shaped support arm (801) at intervals. The universal balls (802) on the plurality of arc-shaped support arms (801) are aligned with each other, and the outer wall of the steel pipe (700) to be welded is supported on the universal balls (802).

3. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 1, characterized in that: The movable support mechanism (200) comprises a rotating support rod (201) and a hydraulic cylinder (210); One end of the rotating support rod (201) is rotatably mounted on the internal clamping cylinder (100), and the other end of the rotating support rod (201) is provided with a fixed plate (202). The fixed plate (202) is provided with a rotating roller (204), and the rotating roller (204) is rotatably mounted on the fixed plate (202). One end of the hydraulic cylinder (210) is rotatably mounted on the inner clamping barrel (100), and the other end is rotatably connected to the middle of the rotating support rod (201). The hydraulic cylinder (210) is used to adjust the distance between the rotating roller (204) and the axis of the inner clamping barrel (100).

4. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 1, characterized in that: A rotation drive motor (600) is further provided in the internal clamping barrel (100), and a counterweight block (603) with a disc structure is provided on the output shaft of the rotation drive motor (600). The rotation drive motor (600) and the counterweight block (603) are both coaxially arranged with the internal clamping barrel (100).

5. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 3, characterized in that: A mobile drive motor (203) is provided on at least one fixed plate (202) of the mobile bracket mechanism. An output shaft of the mobile drive motor (203) passes through the fixed plate (202) and is connected to a rotating roller (204). The mobile drive motor (203) is used to drive the rotating roller (204) to rotate.

6. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 1, characterized in that: The supporting heat-conducting block (500) includes an elastic heat-conducting block, which is connected to the top of the top support rod (400). The outer surface of the elastic heat-conducting block is an arc-shaped fitting surface. The first heat-conducting sheet (510) is an arc-shaped plate. The first heat-conducting sheet (510) is tightly installed on the arc-shaped fitting surface. The arc-shaped fitting surface is also provided with a sliding telescopic groove (503). The second heat-conducting sheet (520) is slidably arranged in the sliding telescopic groove (503).

7. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 6, characterized in that: A welding avoidance groove (511) is provided in the middle of the first heat conducting plate (510), and the welding avoidance groove (511) is aligned with the welding gap (701) between the two steel pipes (700) to be welded.

8. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 7, characterized in that: A fitting slide groove (501) is provided in the elastic heat-conducting block, and a position-limiting installation groove (502) communicating with the fitting slide groove (501) is provided on the inner surface of the elastic heat-conducting block; A V-shaped elastic support frame is also provided on the top of the top support rod (400), and the elastic support frame includes two elastic support plates (401). The ends of the two elastic support plates (401) are each provided with a sliding shaft rod (402). The ends of the elastic support plates (401) are slidably limited in the limiting mounting groove (502), and the sliding shaft rod (402) is slidably limited in the fitting slide rail groove (501).

9. The anti-deformation fixture for automatic welding of stainless steel pipes according to claim 6, characterized in that: The first heat conducting sheet (510) and the second heat conducting sheet (520) are both copper sheets or aluminum sheets, and the elastic heat conducting block is heat conducting silica gel.

10. A deformation-proof clamping method for automatic welding of stainless steel pipes, characterized by: The method uses the anti-deformation fixture according to any one of claims 4 to 9, and the method comprises the following steps: S1: coaxially supporting two steel pipes (700) to be welded on an outer support (800), and adjusting the distance between the two steel pipes (700) to be welded so that the ends of the two steel pipes (700) to be welded are close to each other to form a welding gap (701) of a predetermined distance; S2: placing the inner clamp (100) into the steel pipe to be welded (700), controlling the telescopic rods of all hydraulic cylinders (210) to be telescopically extended and retracted synchronously, until the rotating rollers (204) at the ends of all rotating support rods (201) abut against the inner wall of the inner clamp (100), so that the inner clamp (100) and the steel pipe to be welded (700) are coaxial; S3: moving the inner clamp (100) and adjusting the position of the inner clamp (100) in the steel pipe (700) to be welded so that all the supporting heat conducting blocks (500) are aligned with the welding gap (701); S4: controlling the cone driving mechanism to drive the cone (300) to move along its axis, so that the top support rod (400) extends outward, until the supporting heat conductive block (500) on the top of the top support rod (400) simultaneously abuts against the ends of the two steel pipes (700) to be welded, thereby fixing the two steel pipes (700) to be welded; S5: Control the rotation drive motor (600) to drive the counterweight (603) to rotate. The reaction force of the rotation of the counterweight (603) drives the internal clamping cylinder (100) and the two steel pipes to be welded (700) to rotate on the outer bracket (800), so that the fixed welding gun completes the welding of the entire circular welding gap (701).

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