Welding fixing device for stainless steel pipe machining

Abstract

The invention provides a welding fixing device for stainless steel pipe machining, and relates to the technical field of stainless steel pipe machining. A fixing transverse frame is fixedly connected to the top of the machining bottom plate, a bearing transverse plate is fixedly connected to the middle of the fixing transverse frame, supporting pieces are fixedly connected to the two ends of the bottom of the bearing transverse plate, and a rotating assembly is arranged at the top of the bearing transverse plate and comprises a bearing frame fixedly connected to the top of the bearing transverse plate. The welding gun is driven to rotate around the pipe by 360 degrees, the pipe does not need to be manually rotated after the top of the pipe is welded, waiting time between procedures is shortened, welding efficiency is greatly improved, and the situation that the whole quality of the pipe is affected due to the defects of breakage, cracks and the like of a finished welding seam at the top caused by external force in the pipe rotating process is avoided. The continuity and integrity of welding seams are guaranteed, the defective rate is remarkably reduced, and the product quality stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stainless steel pipe processing, and particularly relates to a welding and fixing device for stainless steel pipe processing. Background Art

[0002] Stainless steel pipes include round, square and special-shaped pipes. Among them, round steel pipes are hollow long round steel, which are mainly widely used in industrial conveying pipelines such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments, etc. and mechanical structure components. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. However, in the process of stainless steel pipe processing, in order to meet various usage requirements, welding is usually used to connect them. To ensure the welding quality, a welding and fixing device is needed to stably fix the pipes. The existing welding and fixing devices need to weld the top surface of the pipe during processing, and then rotate and fix the pipe to weld the other surface. Not only is the welding efficiency low and the operation complex, but also when rotating the pipe halfway, it is easy to break the weld seam, affecting the welding quality. Summary of the Invention

[0003] In view of this, the present invention provides a welding and fixing device for stainless steel pipe processing, which can drive the welding torch to rotate 360 degrees around the pipe through the setting of the rotating assembly, without stopping to manually rotate the pipe after welding the top of the pipe, reducing the waiting time between processes, greatly improving the welding efficiency, avoiding defects such as fracture and crack of the already completed weld seam at the top due to external force during the process of rotating the pipe, affecting the overall quality of the pipe, ensuring the continuity and integrity of the weld seam, significantly reducing the defective rate, and improving the product quality stability; through the setting of the limiting structure, it can reduce the influence of the internal air flow of the pipe, make the welding arc more stable, be conducive to forming a good weld seam formation, reduce the generation of welding defects such as pores and lack of fusion, and at the same time increase the restraint at one end of the pipe, enhance the rigidity of the entire pipe system during welding, help reduce the overall deformation of the pipe caused by welding stress, and better maintain the shape and dimensional accuracy of the pipe, improving the quality of the welded pipe.

[0004] The present invention provides a welding and fixing device for stainless steel pipe processing, which specifically includes: a processing base plate and a rotating assembly;

[0005] A fixed cross frame is fixedly connected to the top of the processing base plate, a bearing cross plate is fixedly connected to the middle of the fixed cross frame, support members are fixedly connected to both ends of the bottom of the bearing cross plate, and a rotating assembly is arranged on the top of the bearing cross plate. The rotating assembly includes:

[0006] A bearing frame, fixedly connected to the top of the bearing cross plate, a docking ring frame is fixedly connected to the bearing frame, and a limiting ring groove is formed on the inner side wall of the docking ring frame;

[0007] The rotating ring is arranged inside the docking ring frame. A fixed convex ring is fixedly connected to the outer side of the rotating ring. The fixed convex ring fits in the limit ring groove. A welding torch is provided on the inner side wall of the rotating ring.

[0008] The assembly seat is fixedly connected to the top of the docking ring frame. A second motor is fixedly installed on the assembly seat. The driving end of the second motor is fixedly connected to a driving gear. One end of the outer side of the rotating ring is fixedly connected to a driven gear. The driven gear meshes with the driving gear.

[0009] In at least some embodiments, a support vertical plate is fixedly connected to the top of the processing base plate. A docking structure is provided between the support vertical plates. The docking structure includes a bidirectional lead screw, a first motor, and a guide rod. The bidirectional lead screw is provided in the middle of the support vertical plates. One end of the bidirectional lead screw is fixedly connected to the driving end of the first motor. Guide rods are provided on both sides of the bidirectional lead screw.

[0010] In at least some embodiments, a moving belt block is provided between the support vertical plates. A first screw hole and a guide hole are respectively formed on the moving belt block. A connecting support plate is fixedly connected to the top of the moving belt block. A fixed support is fixedly connected to the middle of the top of the connecting support plate. A connecting ring frame is fixedly connected to the top of the fixed support. Three connecting support cylinders are fixedly connected to the outer side of the connecting ring frame. An activity sliding hole is formed in the middle of the connecting support cylinder.

[0011] In at least some embodiments, an activity sliding rod is slidably installed inside the activity sliding hole. One end of the bottom of the activity sliding rod is fixedly connected to a positioning plate. A connecting convex ring is fixedly connected to the outer side of the activity sliding rod. A reset cavity is formed inside the connecting support cylinder. The inner side wall of the reset cavity fits with the outer side wall of the connecting convex ring. A spring is provided in the reset cavity. One end of the top of the activity sliding rod is fixedly connected to a pull handle.

[0012] In at least some embodiments, a limiting structure is provided on the top of the connecting support plate. The limiting structure includes a fixed support and a support angle frame. Fixed supports are fixedly connected to both ends of the top of the connecting support plate. The support angle frame is fixedly connected to the inner side of the fixed support.

[0013] In at least some embodiments, a hinged inner frame is provided on the inner side of the fixed support. The hinged inner frame is hinged to the fixed support through a shaft pin. A pressing nut is provided on the outer side of the shaft pin. A guide chute is formed on the hinged inner frame. A connecting cross plate is fixedly connected between the hinged inner frames. A second screw hole is formed in the middle of the connecting cross plate.

[0014] In at least some embodiments, a threaded rod is engaged inside the second screw hole. One end of the top of the threaded rod is fixedly connected to a turning handle. One end of the bottom of the threaded rod is fixedly connected to the inner shaft of a bearing.

[0015] In at least some embodiments, a sealing and limiting plate is provided at the bottom of the connecting cross plate. A bearing groove is formed in the middle of the sealing and limiting plate. A bearing is installed in the bearing groove. Extension convex plates are fixedly connected to both sides of the sealing and limiting plate. Guide convex blocks are fixedly connected to both sides of the extension convex plates. The guide convex blocks are slidably installed in the guide chutes.

[0016] A welding and fixing device for processing stainless steel pipes provided by the present invention has the following

[0017] Beneficial effects

[0018] 1. By providing a rotating assembly in the present invention, the second motor is started to drive the driving gear to rotate. The driving gear meshes with the driven gear to rotate, and the driven gear drives the rotating ring to perform a rotating motion. Then the rotating ring drives the welding torch to perform rotary welding, so that the welding torch is driven to rotate 360 degrees around the pipe for welding. There is no need to stop the machine to manually rotate the pipe after welding the top of the pipe, reducing the waiting time between processes, greatly improving the welding efficiency, avoiding defects such as fracture and cracks in the already completed weld at the top due to external forces during the process of rotating the pipe, affecting the overall quality of the pipe, ensuring the continuity and integrity of the weld, significantly reducing the defective rate, and improving the quality stability of the product.

[0019] 2. By providing a docking structure in the present invention, the handle is pulled to drive the movable slide rod to move the positioning plate closer to the connecting ring frame, and then the pipe is inserted into the inside of the connecting ring frame. At this time, the handle is released. Because the spring is compressed by the connecting convex ring in the reset cavity when the movable slide rod moves, the spring generates elastic deformation. Thus, under the reaction force of the spring, the connecting convex ring is pushed to move. The connecting convex ring drives the positioning plate to reset through the movable slide rod to clamp and fix the pipe, enabling it to automatically adjust the applied force according to the shape and size of the pipe, thereby providing a relatively uniform clamping force in the circumferential direction of the pipe, avoiding deformation of the pipe or deviation of the welding position due to excessive or insufficient local clamping force, and helping to ensure the welding accuracy and quality. Then the first motor is started to drive the bidirectional lead screw to rotate. The bidirectional lead screw rotates and meshes with the first screw hole on the moving belt block. The moving belt block is limited and guided on the guide rod through the guide hole. Then the bidirectional lead screw drives the two groups of moving belt blocks to move towards each other, so that the two parts of the pipe to be welded are butted and joined.

[0020] 3. By providing a limiting structure in the present invention, the pressing nut is rotated to release the pressing on the hinged inner frame, and then the hinged inner frame is rotated to the horizontal. At this time, the pressing nut is rotated again to press and fix it. Then, the turning handle is rotated to drive the threaded rod to rotate. The threaded rod meshes with the second screw hole, and further the threaded rod meshes and moves, thereby pushing the plugging limiting plate to move. This not only can adjust the plugging according to the length of the other end of the pipe, but also can reduce the influence of the airflow in the pipe, make the welding arc more stable, is conducive to forming a good weld formation, reduce the generation of welding defects such as pores and lack of fusion, and at the same time increase the restraint at one end of the pipe, enhance the rigidity of the entire pipe system during the welding process, help reduce the overall deformation of the pipe caused by welding stress, and can better maintain the shape and dimensional accuracy of the pipe, improving the quality of the welded pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0022] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0023] In the drawings:

[0024] Figure 1 shows the overall structural schematic diagram according to the present invention;

[0025] Figure 2 shows the structural schematic diagram during welding after plugging according to the present invention;

[0026] Figure 3 shows the structural schematic diagram of the docking structure and the rotating assembly according to the present invention;

[0027] Figure 4 shows the structural schematic diagram of some components of the rotating assembly according to the present invention;

[0028] Figure 5 shows the structural schematic diagram of the moving belt block in the docking structure according to the present invention;

[0029] Figure 6 shows the structural schematic diagram of some components in the docking structure according to the present invention;

[0030] Figure 7 shows according to the present invention Figure 6 the enlarged structural schematic diagram at A;

[0031] Figure 8 shows the structural schematic diagram of some components of the limiting structure and the docking structure according to the present invention;

[0032] Figure 9Shows a schematic diagram of the limit structure according to the present invention;

[0033] List of reference numerals

[0034] 1. Processing base plate;

[0035] 101. Support vertical plate;

[0036] 2. Docking structure;

[0037] 201. Bi-directional lead screw; 2011. First motor; 2012. Guide rod;

[0038] 202. Moving belt block; 2021. First screw hole; 2022. Guide hole; 2023. Connecting support plate;

[0039] 203. Fixed support; 2031. Connecting ring frame; 2032. Connecting support cylinder; 2033. Movable sliding hole;

[0040] 204. Movable sliding rod; 2041. Positioning plate; 2042. Connecting convex ring; 2043. Reset cavity; 2044. Spring; 2045. Pull handle;

[0041] 3. Rotating assembly;

[0042] 301. Fixed horizontal frame; 3011. Bearing horizontal plate; 3012. Support member;

[0043] 302. Bearing frame; 3021. Docking ring frame; 3022. Limit ring groove;

[0044] 303. Rotating ring; 3031. Fixed convex ring; 3032. Welding torch; 3033. Assembly seat; 3034. Driven gear;

[0045] 304. Second motor; 3041. Driving gear;

[0046] 4. Limit structure;

[0047] 401. Fixed bracket; 4011. Support angle frame;

[0048] 402. Hinged inner frame; 4021. Axle pin; 4022. Compression nut; 4023. Guide chute; 4024. Connecting cross plate; 4025. Second screw hole;

[0049] 403. Threaded rod; 4031. Turning handle; 4032. Bearing;

[0050] 404. Sealing limit plate; 4041. Bearing groove; 4042. Extended convex plate; 4043. Guide convex block.

[0051] Example: Please refer to Figures 1 to 9 :

[0052] The present invention provides a welding fixing device for processing stainless steel pipes, comprising: a processing base plate 1 and a rotating assembly 3;

[0053] A fixed horizontal frame 301 is fixedly connected to the top of the processing base plate 1. A bearing horizontal plate 3011 is fixedly connected to the middle of the fixed horizontal frame 301. Two ends of the bottom of the bearing horizontal plate 3011 are fixedly connected with support members 3012. A rotating assembly 3 is arranged on the top of the bearing horizontal plate 3011. The rotating assembly 3 includes:

[0054] A bearing frame 302, fixedly connected to the top of the bearing horizontal plate 3011. A docking ring frame 3021 is fixedly connected to the bearing frame 302. A limiting ring groove 3022 is formed on the inner side wall of the docking ring frame 3021;

[0055] A rotating ring 303 is arranged inside the docking ring frame 3021. A fixed convex ring 3031 is fixedly connected to the outer side of the rotating ring 303. The fixed convex ring 3031 fits in the limiting ring groove 3022. A welding torch 3032 is arranged on the inner side wall of the rotating ring 303;

[0056] An assembly seat 3033 is fixedly connected to the top of the docking ring frame 3021. A second motor 304 is fixedly installed on the assembly seat 3033. A driving gear 3041 is fixedly connected to the driving end of the second motor 304. A driven gear 3034 is fixedly connected to one end of the outer side of the rotating ring 303. The driven gear 3034 meshes with the driving gear 3041;

[0057] By starting the second motor 304 to drive the driving gear 3041 to rotate, the driving gear 3041 meshes with the driven gear 3034 to rotate, and the driven gear 3034 drives the rotating ring 303 to perform a rotational movement. Furthermore, the rotating ring 303 drives the welding torch 3032 to perform rotational welding. Through the guiding of the fixed convex ring 3031 in the limiting ring groove 3022, the stability of the rotating ring 303 during rotation is ensured, and it is ensured that the weld seam does not shift during welding by the welding torch 3032.

[0058] Embodiment 2: On the basis of Embodiment 1, as shown in Figure 3 、 Figure 5 、 Figure 6 and Figure 7 , a support vertical plate 101 is fixedly connected to the top of the processing base plate 1. A docking structure 2 is arranged between the support vertical plates 101. The docking structure 2 includes a bidirectional lead screw 201, a first motor 2011 and a guide rod 2012. A bidirectional lead screw 201 is arranged in the middle of the support vertical plates 101. One end of the bidirectional lead screw 201 is fixedly connected to the driving end of the first motor 2011. Guide rods 2012 are arranged on both sides of the bidirectional lead screw 201.

[0059] There is a moving belt block 202 between the supporting vertical plates 101. The moving belt block 202 is respectively provided with a first screw hole 2021 and a guiding hole 2022. The top of the moving belt block 202 is fixedly connected with a connecting support plate 2023. The middle of the top of the connecting support plate 2023 is fixedly connected with a fixed support 203. The top of the fixed support 203 is fixedly connected with a connecting ring frame 2031. The outside of the connecting ring frame 2031 is fixedly connected with three groups of connecting support cylinders 2032. The middle of the connecting support cylinder 2032 is provided with a movable sliding hole 2033.

[0060] By starting the first motor 2011 to drive the bidirectional lead screw 201 to rotate, the bidirectional lead screw 201 rotates and meshes with the first screw hole 2021 on the moving belt block 202. The moving belt block 202 is limited and guided on the guiding rod 2012 through the guiding hole 2022. Furthermore, the bidirectional lead screw 201 drives the two moving belt blocks 202 to move towards each other, so that the two pipe joints to be welded are fitted and butted.

[0061] A movable sliding rod 204 is slidably installed inside the movable sliding hole 2033. One end of the bottom of the movable sliding rod 204 is fixedly connected with a positioning plate 2041. The outside of the movable sliding rod 204 is fixedly connected with a connecting convex ring 2042. A reset cavity 2043 is opened inside the connecting support cylinder 2032. The inner side wall of the reset cavity 2043 is fitted with the outer side wall of the connecting convex ring 2042. A spring 2044 is arranged in the reset cavity 2043. One end of the top of the movable sliding rod 204 is fixedly connected with a pulling handle 2045.

[0062] By pulling the pulling handle 2045 to drive the movable sliding rod 204 to move the positioning plate 2041 close to the connecting ring frame 2031, and then inserting the pipe into the inside of the connecting ring frame 2031. At this time, release the pulling handle 2045. Because when the movable sliding rod 204 moves, the spring 2044 is extruded in the reset cavity 2043 through the connecting convex ring 2042, so that the spring 2044 generates elastic deformation. Thus, under the reaction force of the spring 2044, the connecting convex ring 2042 is pushed to move. The connecting convex ring 2042 drives the positioning plate 2041 to reset through the movable sliding rod 204 to clamp and fix the pipe.

[0063] Embodiment 3: On the basis of Embodiment 1 and Embodiment 2, as Figure 8 and Figure 9 shown, a limiting structure 4 is arranged on the top of the connecting support plate 2023. The limiting structure 4 includes a fixed bracket 401 and a supporting angle frame 4011. The two ends of the top of the connecting support plate 2023 are fixedly connected with the fixed bracket 401. The inner side of the fixed bracket 401 is fixedly connected with the supporting angle frame 4011.

[0064] The inner side of the fixed bracket 401 is provided with a hinged inner frame 402. The hinged inner frame 402 is hinged to the fixed bracket 401 through a pin 4021. A compression nut 4022 is arranged outside the pin 4021. A guide chute 4023 is formed on the hinged inner frame 402. A connecting cross plate 4024 is fixedly connected between the hinged inner frames 402. A second screw hole 4025 is formed in the middle of the connecting cross plate 4024.

[0065] A threaded rod 403 is engaged inside the second screw hole 4025. The top end of the threaded rod 403 is fixedly connected with a turning handle 4031. The bottom end of the threaded rod 403 is fixedly connected to the inner shaft of a bearing 4032.

[0066] A plugging limit plate 404 is arranged at the bottom of the connecting cross plate 4024. A bearing groove 4041 is formed in the middle of the plugging limit plate 404. The bearing 4032 is installed in the bearing groove 4041. Extension convex plates 4042 are fixedly connected to both sides of the plugging limit plate 404. Guide convex blocks 4043 are fixedly connected to both sides of the extension convex plates 4042. The guide convex blocks 4043 are slidably installed in the guide chute 4023.

[0067] By rotating the compression nut 4022 to release the compression on the hinged inner frame 402, and then rotating the hinged inner frame 402 to the horizontal position. At this time, rotate the compression nut 4022 again to press and fix it. Then rotate the turning handle 4031 to drive the threaded rod 403 to rotate. The threaded rod 403 is engaged with the second screw hole 4025. Further, the threaded rod 403 engages and moves, thereby pushing the plugging limit plate 404 to move.

[0068] Specific usage method and function of this embodiment: In the present invention, it is necessary to drive the movable slide rod 204 by pulling the handle 2045 to move the positioning plate 2041 close to the connecting ring frame 2031, and then insert the pipe into the inside of the connecting ring frame 2031. At this time, release the handle 2045. Because when the movable slide rod 204 moves, the spring 2044 is squeezed by the connecting convex ring 2042 in the reset cavity 2043, causing the spring 2044 to produce elastic deformation. Thus, under the reaction force of the spring 2044, the connecting convex ring 2042 is pushed to move. The connecting convex ring 2042 drives the positioning plate 2041 to reset through the movable slide rod 204 to clamp and fix the pipe, enabling it to automatically adjust the applied force according to the shape and size of the pipe, thereby providing a relatively uniform clamping force in the circumferential direction of the pipe, avoiding pipe deformation or welding position deviation caused by excessive or too small local clamping force, and helping to ensure the accuracy and quality of welding. Then, start the first motor 2011 to drive the bidirectional lead screw 201 to rotate. The bidirectional lead screw 201 rotates and meshes with the first screw hole 2021 on the moving belt block 202. The moving belt block 202 is limited and guided on the guide rod 2012 through the guide hole 2022. Furthermore, the bidirectional lead screw 201 drives the two groups of moving belt blocks 202 to move towards each other, making the two groups of pipe joints to be welded fit and butt. Then, rotate the compression nut 4022 to release the compression on the hinged inner frame 402, and then rotate the hinged inner frame 402 to the horizontal. At this time, rotate the compression nut 4022 again to press and fix it. Then, rotate the handle 4031 to drive the threaded rod 403 to rotate. The threaded rod 403 meshes with the second screw hole 4025. Furthermore, the threaded rod 403 meshes and moves, thereby pushing the plugging limit plate 404 to move. It can not only adjust the plugging according to the length of the other end of the pipe, but also reduce the influence of the airflow in the pipe, make the welding arc more stable, and is conducive to forming a good weld profile. Finally, start the second motor 304 to drive the driving gear 3041 to rotate. The driving gear 3041 meshes with the driven gear 3034 to rotate. The driven gear 3034 drives the rotating ring 303 to perform a rotational motion. Furthermore, the rotating ring 303 drives the welding torch 3032 to perform rotational welding, enabling the welding torch 3032 to rotate around the pipe for 360-degree welding. There is no need to stop the machine to manually rotate the pipe after welding the top of the pipe, reducing the waiting time between processes, greatly improving the welding efficiency, avoiding defects such as fracture and crack in the completed weld at the top due to external force during the rotation of the pipe, affecting the overall quality of the pipe, ensuring the continuity and integrity of the weld, significantly reducing the defective rate, and improving the product quality stability.

Claims

1. A welding fixture for stainless steel pipe processing, comprising: Processing the base plate (1) and the rotating assembly (3); The top of the processing bottom plate (1) is fixedly connected to a fixed transverse frame (301), the middle of the fixed transverse frame (301) is fixedly connected to a bearing transverse plate (3011), the bottom ends of the bearing transverse plate (3011) are fixedly connected to support members (3012), and the top of the bearing transverse plate (3011) is provided with a rotating assembly (3), characterized in that the rotating assembly (3) comprises: The bearing frame (302) is fixedly connected to the top of the bearing horizontal plate (3011), a docking ring frame (3021) is fixedly connected to the bearing frame (302), and a limiting ring groove (3022) is provided on the inner side wall of the docking ring frame (3021); A rotating ring (303) is arranged on the inner side of the docking ring frame (3021); a fixed convex ring (3031) is fixedly connected to the outer side of the rotating ring (303); the fixed convex ring (3031) fits in the limiting ring groove (3022); and a welding gun (3032) is arranged on the inner side wall of the rotating ring (303); The assembly seat (3033) is fixedly connected to the top of the docking ring frame (3021), and a second motor (304) is fixedly mounted on the assembly seat (3033). The driving end of the second motor (304) is fixedly connected to a driving gear (3041). An outer end of the rotating ring (303) is fixedly connected to a driven gear (3034), and the driven gear (3034) is meshed with the driving gear (3041).

2. A welding and fixing device for processing stainless steel pipes according to claim 1, characterized in that: The top of the processing bottom plate (1) is fixedly connected to a supporting vertical plate (101), a docking structure (2) is provided between the supporting vertical plates (101), the docking structure (2) comprises a bidirectional screw rod (201), a first motor (2011) and a guide rod (2012), a bidirectional screw rod (201) is provided in the middle of the supporting vertical plate (101), one end of the bidirectional screw rod (201) is fixedly connected to a driving end of the first motor (2011), and guide rods (2012) are provided on both sides of the bidirectional screw rod (201).

3. A welding and fixing device for processing stainless steel pipes according to claim 2, characterized in that: A movable belt block (202) is provided between the supporting vertical plates (101), and a first screw hole (2021) and a guide hole (2022) are respectively provided on the movable belt block (202), a connecting support plate (2023) is fixedly connected to the top of the movable belt block (2022), a fixed support (203) is fixedly connected to the middle of the top of the connecting support plate (2023), a connecting ring frame (2031) is fixedly connected to the top of the fixed support (203), three groups of connecting support tubes (2032) are fixedly connected to the outer side of the connecting ring frame (2031), and a movable sliding hole (2033) is provided in the middle of the connecting support tube (2032).

4. A welding and fixing device for processing stainless steel pipes according to claim 3, characterized in that: A movable slide rod (204) is slidably installed inside the movable slide hole (2033), a positioning plate (2041) is fixedly connected to one end of the bottom of the movable slide rod (204), a connecting convex ring (2042) is fixedly connected to the outside of the movable slide rod (204), a reset cavity (2043) is opened inside the connecting support tube (2032), the inner wall of the reset cavity (2043) is in contact with the outer wall of the connecting convex ring (2042), a spring (2044) is arranged in the reset cavity (2043), and a pull handle (2045) is fixedly connected to one end of the top of the movable slide rod (204).

5. The welding and fixing device for stainless steel pipe processing according to claim 3 is characterized in that: A limiting structure (4) is provided on the top of the connecting support plate (2023), the limiting structure (4) comprising a fixed bracket (401) and a supporting angle frame (4011), the two ends of the top of the connecting support plate (2023) are fixedly connected to the fixed bracket (401), and the inner side of the fixed bracket (401) is fixedly connected to the supporting angle frame (4011).

6. A welding and fixing device for processing stainless steel pipes according to claim 5, characterized in that: A hinged inner frame (402) is provided on the inner side of the fixed bracket (401), and the hinged inner frame (402) is hinged to the fixed bracket (401) through an axle pin (4021). A clamping nut (4022) is provided on the outer side of the axle pin (4021). A guide groove (4023) is provided on the hinged inner frame (402), and a connecting cross plate (4024) is fixedly connected between the hinged inner frames (402), and a second screw hole (4025) is provided in the middle of the connecting cross plate (4024).

7. A welding and fixing device for processing stainless steel pipes according to claim 6, characterized in that: A threaded rod (403) is meshed inside the second screw hole (4025), a top end of the threaded rod (403) is fixedly connected to a handle (4031), and a bottom end of the threaded rod (403) is fixedly connected to the inner shaft of the bearing (4032).

8. The welding and fixing device for stainless steel pipe processing according to claim 6, characterized in that: A blocking limit plate (404) is provided at the bottom of the connecting transverse plate (4024), a bearing groove (4041) is provided in the middle of the blocking limit plate (404), the bearing (4032) is installed in the bearing groove (4041), and extension convex plates (4042) are fixedly connected on both sides of the blocking limit plate (404), and guide protrusions (4043) are fixedly connected on both sides of the extension convex plate (4042), and the guide protrusions (4043) are slidably installed in the guide sliding grooves (4023).

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