A magnetic installation and welding process and equipment for pressure pipelines

Abstract

The present invention relates to the technical field of pipeline welding, specifically a magnetic installation welding process for pressure pipelines, including clamping and limiting of pipelines, automatic demagnetization, and automatic welding treatment. In the present invention, two movable frames are arranged on the top of the movable chassis, and the demagnetization mechanism inside the two movable frames is used to demagnetize the groove of the pressure pipeline, and then the welding mechanism is used to weld the two ends of the pressure pipeline. By pre-demagnetizing the groove of the pressure pipeline and then welding and processing the groove of the pressure pipeline, it can effectively shorten the construction period of pipeline welding, improve the welding quality and working efficiency of the pipeline. For the case where the magnetic excess is small, a metal strip is used to contact the surface of the pressure pipeline, and for the case where the magnetic excess is large, the electric welding handle wire is wound around the surface of the pressure pipeline to automatically eliminate the magnetism in the groove area of the pipeline, and the rotating frame is used to drive the welding torch to automatically weld the groove of the pressure pipeline, significantly improving the welding efficiency of the pressure pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and particularly to a magnetic installation welding process and equipment for pressure pipelines. Background Art

[0002] During the overhaul of petrochemical plants and the welding construction of process pipelines, the welding electrode will be strongly adsorbed to the pipeline at a certain distance from the welding groove. When welding, the interaction between the reverse current magnetic field generated after the electrode is arc-started and the residual magnetic field causes the arc to deflect outward from the groove, making it impossible to form a molten pool and a weld, so that pipeline welding cannot be carried out in the magnetized state.

[0003] Currently, before welding the groove area of a pressure pipeline, due to the excessive magnetism in the groove area, it is impossible to weld the groove area of the pressure pipeline. It is necessary to manually demagnetize the groove area of the pressure pipeline, which not only reduces the welding efficiency of the pressure pipeline, but also prolongs the welding construction period of the pressure pipeline.

[0004] For this reason, we have proposed a magnetic installation welding process for pressure pipelines, and at the same time, a magnetic installation welding equipment for pressure pipelines is also disclosed. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a magnetic installation welding process and equipment for pressure pipelines, which are used to automatically demagnetize and automatically weld the magnetism of the groove area of the pressure pipeline, shorten the welding construction period of the pipeline, and improve the welding quality and working efficiency of the pressure pipeline.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A magnetic installation welding process for pressure pipelines specifically includes the following steps:

[0007] Step S1: Use a servo motor and a driving block to cooperate to drive the threaded rod to rotate clockwise, so that the two movable blocks move in opposite directions along the threaded rod inside the chute. Use the two movable blocks to drive the two movable plates to move in opposite directions on the top of the movable bottom frame, so that the two movable frames move away from each other, place the pressure pipeline between the two movable frames, use the micro electric cylinder drive end inside the support frame to push the limit frame upward, use the arc groove inside the limit frame to support the bottom of the pressure pipeline, and then use the micro electric cylinder inside the limit frame to drive the two limit plates to clamp and limit the two sides of the pressure pipeline, and finally control the two movable frames to reset;

[0008] Step S2: Detect the magnetism of the pressure pipeline. For those with weak magnetism, use the drive end of the second servo cylinder to push the metal bar to contact the surface of the pressure pipeline, connect the two sides of the groove area of the pressure pipeline, so that the groove area of the pressure pipeline changes from the original magnetic pole end to the magnet body area, and demagnetize the groove area of the pressure pipeline;

[0009] Step S3: For those with relatively strong magnetism, drive the welding torch wire along the spiral groove by means of an electric slider, so that the welding torch wire is wound around the surface of the pressure pipeline. Then, pass direct current into the interior of the welding torch wire to generate magnetism, and adjust the magnitude and direction of the current to cancel out the magnetism of the pressure pipeline body.

[0010] Step S4: Control one end of the second clamping block inside the front rotating frame to insert into the interior of the rear rotating frame. Then, control the first clamping block inside the rear rotating frame to insert into the clamping groove inside the second clamping block. Utilize the cooperative connection of the first clamping block and the second clamping block inside the rear rotating frame to achieve the cooperative connection of the two rotating frames. Utilize the meshing transmission between the driving gear and the teeth on one side of the rotating frame to enable the two rotating frames to rotate inside the two rotating grooves. Utilize the driving end of the first servo cylinder to drive the welding torch to approach the groove of the pressure pipeline, and use the welding torch to perform welding treatment on the groove of the pressure pipeline.

[0011] A magnetic installation welding device for pressure pipelines includes a movable bottom frame and two support frames. On both sides of the top of the movable bottom frame, support frames are provided. On the front and rear sides of the top of the movable bottom frame, movable plates are provided, and on the top of both movable plates, movable frames are provided. Inside both movable frames, welding mechanisms are provided, and inside both movable frames, demagnetization mechanisms are also provided.

[0012] Preferably, a limit frame is provided above the support frame, and an arc-shaped groove is provided inside the limit frame. Two limit plates are slidably arranged inside the arc-shaped groove.

[0013] Preferably, the welding mechanism includes a welding torch. Inside both movable frames, rotating grooves are provided, and inside both rotating grooves, rotating frames are movably arranged. On one side of the rear rotating frame, a connecting block is provided, and on one side of the connecting block, a first servo cylinder is provided. The driving end of the first servo cylinder is provided with a welding torch. Inside the rear movable frame, a driving gear is rotatably arranged, and on one side of the rotating frame, teeth are provided that cooperate with the driving gear. The surface of the driving gear is in meshing transmission with the surface of the teeth.

[0014] Preferably, a first clamping block and a second clamping block are respectively provided at the top and bottom of the rotating frame, and a clamping groove that cooperates with the first clamping block is provided inside the second clamping block. Electric push rods are provided above and below inside the movable frame, and magnetic stickers are provided at the driving ends of both electric push rods.

[0015] Preferably, the demagnetization component includes metal strips. Inside the movable frame, a number of second servo cylinders are provided, and the number of second servo cylinders is symmetrically arranged with respect to the welding mechanism. The driving ends of the number of second servo cylinders are all provided with metal strips, and one ends of the metal strips on both sides of the welding mechanism are connected to each other.

[0016] Preferably, spiral grooves are provided on both sides of the inner wall of the movable frame, and racks are provided on one side of the inner wall of the spiral grooves. Electric sliders are movably arranged inside the spiral grooves, and the bottoms of the electric sliders are meshed and driven with the surfaces of the racks. One side of the electric slider is provided with a welding torch wire, and the other end of the welding torch wire is provided with a wire pay-off rack. A connecting piece is provided at one end of the spiral groove, and the connecting pieces on both sides of the welding mechanism are electrically connected.

[0017] Preferably, a chute is provided inside the movable bottom frame, and a threaded rod is rotatably arranged inside the chute. Two movable blocks are slidably arranged inside the chute, and the tops of the two movable blocks are respectively connected to the bottoms of the two movable plates. Threaded holes are provided inside the two movable blocks, and the surfaces of the threaded holes inside the two movable blocks are threadedly connected to the surface of the threaded rod. A servo motor is provided at the bottom of the movable bottom frame, and a driving block is provided on one side of the servo motor.

[0018] Two meshing transmission gears are provided inside the driving block, one of the transmission gears is connected to the output end of the servo motor, and the other transmission gear is connected to one end of the threaded rod.

[0019] Compared with the prior art, the following beneficial effects are achieved:

[0020] 1. By arranging two movable frames on the top of the movable bottom frame, the degaussing mechanism inside the two movable frames is used to degauss the bevel of the pressure pipeline, and then the welding mechanism is used to weld the two ends of the pressure pipeline. By pre-degaussing the bevel of the pressure pipeline and then welding the bevel of the pressure pipeline, the construction period of pipeline welding can be effectively shortened, and the welding quality and work efficiency of the pipeline can be improved.

[0021] 2. By arranging support frames on both sides of the top of the movable bottom frame, and at the same time arranging a limit frame and a limit plate on the top of the support frame, the driving end of the micro electric cylinder inside the support frame is used to push the limit frame upward, the arc groove inside the limit frame is used to support the bottom of the pressure pipeline, and then the micro electric cylinder inside the limit frame is used to drive the two limit plates to clamp and limit the two sides of the pressure pipeline, so as to avoid the shaking of the pressure pipeline during the welding process and effectively improve the welding quality of the pressure pipeline.

[0022] 3. By arranging a rotating frame inside the movable frame, the rotating frame drives the welding torch to rotate at the bevel area of the pressure pipeline, and the rotating frame drives the welding torch to automatically weld the bevel of the pressure pipeline, significantly improving the welding efficiency of the pressure pipeline. 4. By detecting the magnetism of the pressure pipeline, when the magnetism exceeds the standard by a small amount, a metal bar is used to contact the surface of the pressure pipeline to connect both sides of the bevel area of the pressure pipeline, making the bevel area of the pressure pipeline change from the original magnetic pole end to a magnet body area, reducing the magnetism of the bevel area, thereby realizing the welding of the bevel area of the pressure pipeline, significantly improving the welding efficiency of the pressure pipeline, and effectively ensuring the welding quality of the pressure pipeline. When the magnetism exceeds the standard by a large amount, the welding electrode cable is wound around the surface of the pressure pipeline, and then direct current is passed into the welding electrode cable to generate magnetism. The magnitude and direction of the current are adjusted to offset the magnetism of the pressure pipeline body, and then the welding mechanism is used to perform welding treatment on the pressure pipeline. There is no need for manual winding of the welding electrode cable, effectively improving the welding efficiency of the pressure pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG.

[0024] Figure 2 is a flowchart of a magnetic installation welding process for a pressure pipeline according to an embodiment of the present invention;

[0025] Figure 3 FIG.

[0026] Figure 4 is a schematic diagram of the structure of a movable frame and a rotating frame according to an embodiment of the present invention;

[0027] Figure 5 According to an embodiment of the present invention Figure 3 is an enlarged view of the structure at A in FIG.

[0028] Figure 6 According to an embodiment of the present invention Figure 4 is an enlarged view of the structure at B in FIG.

[0029] Figure 7 FIG.

[0030] Figure 8 is a schematic diagram of the structure of a movable bottom frame and a movable block according to an embodiment of the present invention;

[0031] Figure 9 is a schematic diagram of the unfolding process of the movable frame according to an embodiment of the present invention.

[0032] In the figure, 10 is a movable chassis; 20 is a support frame; 30 is a movable plate; 40 is a movable frame; 50 is a limit frame; 60 is a limit plate; 11 is a welding torch; 12 is a rotating groove; 13 is a rotating frame; 14 is a connecting block; 15 is a first servo cylinder; 16 is a driving gear; 17 is a first clamping block; 18 is a second clamping block; 19 is a clamping groove; 110 is an electric push rod; 21 is a metal strip; 22 is a second servo cylinder; 23 is a spiral groove; 24 is a rack; 25 is an electric slider; 26 is a welding electrode cable; 27 is a connecting piece; 31 is a sliding groove; 32 is a threaded rod; 33 is a movable block; 34 is a servo motor; 35 is a driving block. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figures 1 to 9 As shown, a magnetic installation and welding process for pressure pipelines specifically includes the following steps:

[0036] Step S1: Use the cooperation of the servo motor 34 and the driving block 35 to drive the threaded rod 32 to rotate clockwise, so that the two movable blocks 33 move in opposite directions along the threaded rod 32 inside the sliding groove 31. Use the two movable blocks 33 to drive the two movable plates 30 to move in opposite directions on the top of the movable chassis 10, so that the two movable frames 40 move away from each other, place the pressure pipeline between the two movable frames 40, use the micro-cylinder driving end inside the support frame 20 to push the limit frame 50 upward, use the arc groove inside the limit frame 50 to support the bottom of the pressure pipeline, and then use the micro-cylinder inside the limit frame 50 to drive the two limit plates 60 to clamp and limit the two sides of the pressure pipeline, and finally control the two movable frames 40 to reset;

[0037] Step S2: Detect the magnetism of the pressure pipeline. For those with weak magnetism, use the driving end of the second servo cylinder 22 to push the metal strip 21 into contact with the surface of the pressure pipeline, connect the two sides of the bevel area of the pressure pipeline, so that the bevel area of the pressure pipeline changes from the original magnetic pole end to the magnet body area, and demagnetize the bevel area of the pressure pipeline;

[0038] Step S3: For those with relatively strong magnetism, drive the welding torch wire 26 along the spiral groove 23 by the electric slider 25, so that the welding torch wire 26 winds around the surface of the pressure pipeline. Then, pass direct current into the interior of the welding torch wire 26 to generate magnetism, and adjust the magnitude and direction of the current to cancel out the magnetism of the pressure pipeline body.

[0039] Step S4: Control one end of the second fixture block 18 inside the front-side rotating frame 13 to insert into the interior of the rear-side rotating frame 13. Then, control the first fixture block 17 inside the rear-side rotating frame 13 to insert into the card slot 19 inside the second fixture block 18. By means of the cooperative connection of the first fixture block 17 and the second fixture block 18 inside the rear-side rotating frame 13, the cooperative connection of the two rotating frames 13 is realized. By means of the meshing transmission of the driving gear 16 and the teeth on one side of the rotating frame 13, the two rotating frames 13 rotate inside the two rotating grooves 12. Drive the welding torch 11 to approach the groove of the pressure pipeline by the driving end of the first servo electric cylinder 15, and perform welding treatment on the groove of the pressure pipeline by the welding torch 11.

[0040] Embodiment 2

[0041] Please refer to Figures 2 to 9 As shown in the figure, a magnetic installation welding device for a pressure pipeline includes a movable chassis 10 and two support frames 20. Both sides of the top of the movable chassis 10 are provided with support frames 20. The front and rear sides of the top of the movable chassis 10 are both provided with movable plates 30, and movable frames 40 are arranged on the tops of both movable plates 30. Among them, both sides of the bottom of the movable plate 30 are provided with sliders, and both sliders are slidably connected to the top of the movable chassis 10. Welding mechanisms are arranged inside both movable frames 40, and a demagnetization mechanism is also arranged inside both movable frames 40. When performing welding treatment on the pressure pipeline, first control the two movable plates 30 to move forward and backward on the top of the movable chassis 10, so that the pressure pipeline is located between the two movable frames 40, and use the support frames 20 on both sides to support the pressure pipeline. Then, control the two movable frames 40 to approach each other, and use the demagnetization mechanisms inside the two movable frames 40 to perform demagnetization treatment on the grooves of the pressure pipeline. Then, use the welding mechanisms to weld both ends of the pressure pipeline. By pre-demagnetizing the grooves of the pressure pipeline and then performing welding processing on the grooves of the pressure pipeline, the construction period of pipeline welding can be effectively shortened, and the pipeline welding quality and work efficiency can be improved.

[0042] A limiting frame 50 is provided above the support frame 20, and an arc-shaped groove is provided inside the limiting frame 50. Two limiting plates 60 are slidably arranged inside the arc-shaped groove. Miniature electric cylinders are provided inside both the support frame 20 and the limiting frame 50, and the driving ends of the two groups of miniature electric cylinders are respectively connected to the bottom of the limiting frame 50 and one side of the limiting plate 60. The driving end of the miniature electric cylinder inside the support frame 20 is used to push the limiting frame 50 upward, the bottom of the pressure pipeline is supported by the arc-shaped groove inside the limiting frame 50, and then the two limiting plates 60 are driven by the miniature electric cylinder inside the limiting frame 50 to clamp and limit both sides of the pressure pipeline, avoiding the shaking of the pressure pipeline during the welding process and effectively improving the welding quality of the pressure pipeline.

[0043] The welding mechanism includes a welding torch 11. Rotation grooves 12 are provided inside both of the two movable frames 40, and rotation frames 13 are movably arranged inside the two rotation grooves 12. A connecting block 14 is arranged on one side of the rotation frame 13 at the rear, and a first servo electric cylinder 15 is arranged on one side of the connecting block 14. The driving end of the first servo electric cylinder 15 is provided with the welding torch 11. A driving gear 16 is rotatably arranged inside the movable frame 40 at the rear, and teeth matching with the driving gear 16 are arranged on one side of the rotation frame 13. The surface of the driving gear 16 is in meshing transmission with the surface of the teeth. The driving gear 16 is driven by a motor. When welding the bevel of the pressure pipeline, the rotation frame 13 is driven to rotate inside the rotation groove 12 by the driving gear 16, the driving end of the first servo electric cylinder 15 is used to drive the welding torch 11 to approach the bevel of the pressure pipeline, the bevel of the pressure pipeline is welded by the welding torch 11, and the welding torch 11 is driven by the rotation frame 13 to automatically weld the bevel of the pressure pipeline, significantly improving the welding efficiency of the pressure pipeline.

[0044] Further, a first clamping block 17 and a second clamping block 18 are respectively arranged at the top and bottom of the rotating frame 13, and a clamping groove 19 matched with the first clamping block 17 is arranged inside the second clamping block 18. Electric push rods 110 are arranged above and below the inside of the movable frame 40, and magnetic stickers are arranged at the driving ends of the two electric push rods 110. The magnetic stickers are used to attract one side of the first clamping block 17 and the second clamping block 18. One end of the first clamping block 17 is vertically inserted into the inside of the rotating frame 13, and the second clamping block 18 moves horizontally inside the rotating frame 13. The positions of the first clamping block 17 and the second clamping block 18 inside the two rotating frames 13 are opposite. After controlling the two movable frames 40 to contact each other, first, one end of the second clamping block 18 inside the front rotating frame 13 is inserted into the inside of the rear rotating frame 13, and then the first clamping block 17 inside the rear rotating frame 13 is inserted into the clamping groove 19 inside the second clamping block 18. The first clamping block 17 and the second clamping block 18 are connected in cooperation inside the rear rotating frame 13 to realize the cooperative connection of the two rotating frames 13. The driving gear 16 is meshed with the teeth on one side of the rotating frame 13 to make the two rotating frames 13 rotate inside the two rotating grooves 12, so that the welding torch 11 automatically welds the bevel of the pressure pipeline.

[0045] The demagnetization component includes a metal strip 21. A plurality of second servo cylinders 22 are arranged inside the movable frame 40, and the plurality of second servo cylinders 22 are symmetrically arranged with respect to the welding mechanism. Metal strips 21 are arranged at the driving ends of the plurality of second servo cylinders 22, and one ends of the metal strips 21 on both sides of the welding mechanism are connected to each other. Before welding the pressure pipeline, the magnetism of the pressure pipeline is detected. For those with not very large magnetic over-standard, the driving end of the second servo cylinder 22 is used to push the metal strip 21 to contact the surface of the pressure pipeline, so that both sides of the bevel area of the pressure pipeline are connected, and the bevel area of the pressure pipeline changes from the original magnetic pole region to a magnet region, reducing the magnetism of the bevel area, thereby realizing the welding of the bevel area of the pressure pipeline, significantly improving the welding efficiency of the pressure pipeline, and effectively ensuring the welding quality of the pressure pipeline.

[0046] Furthermore, spiral grooves 23 are provided on both sides of the inner wall of the movable frame 40, and a rack 24 is provided on one side of the inner wall of the spiral groove 23. An electric slider 25 is movably arranged inside the spiral groove 23, and the bottom of the electric slider 25 is in meshing transmission with the surface of the rack 24. One side of the electric slider 25 is provided with a welding torch cable 26, and the other end of the welding torch cable 26 is provided with a wire reel. The wire reel is arranged inside the movable frame 40 to wind and unwind the welding torch cable 26; a connecting piece 27 is provided at one end of the spiral groove 23, and the connecting pieces 27 on both sides of the welding mechanism are electrically connected. After the electric slider 25 drives the welding torch cable 26 to move to one side of the spiral groove 23, one end of the welding torch cable 26 is made to contact the connecting piece 27, so that the welding torch cables 26 on both sides inside the movable frame 40 are electrically connected. When degaussing the pressure pipeline, the electric slider 25 drives the welding torch cable 26 to move along the spiral groove 23, so that the welding torch cable 26 is wound around the surface of the pressure pipeline. Then, direct current is passed into the welding torch cable 26 to generate magnetism, the magnitude and direction of the current are adjusted to cancel the magnetism of the pressure pipeline body, and then the welding mechanism is used to weld the pressure pipeline. There is no need for manual winding of the welding torch cable 26, effectively improving the welding efficiency of the pressure pipeline.

[0047] Furthermore, for the degaussing method of the pressure pipeline, an oxygen / acetylene cutting torch can also be used to heat both sides of the groove. The flame is adjusted to a neutral flame, and the temperature reaches 900°C - 1200°C. The phase structure in the alloy changes from ferromagnetic ferrite + pearlite to non-magnetic austenite, and the color is bright red. Then, root welding is immediately carried out on the heated area. The welding parameters can be selected as the usual welding parameters, and the continuous root welding method is adopted to increase the temperature of the welding area and slow down the temperature reduction rate of the heated area. When the heated area changes from bright red to dark red, the welding sound changes, and the molten metal in the molten pool cannot be fused. Welding should be immediately stopped and reheated.

[0048] Heat and weld 6 - 12 points according to the diameter of the steel pipe. The two ends with the strongest original magnetism are transformed into the middle section after connection, and the magnetism is weakened. The remaining magnetism passes through the 6 - 12 root welding points. The magnetism at the non-root welded parts can meet the requirement of being less than 0.3 mT (240 A / m) of the standard, and normal welding can be carried out.

[0049] For welds with high requirements and corresponding non-destructive testing requirements, if double-sided welding is possible, after completing the welding of the outer ring, the backing layer is removed inside the pipe, and then the sealing weld is carried out. For those that can only be single-sided welded, after completing the backing welding of 6 - 12 segments, it is processed according to the welding situation. For other parts where normal welding can be carried out, the backing, filling, and capping welding of other parts are carried out first, and then the backing parts of 6 - 12 places are removed one by one and the backing, filling, and capping welding are carried out again; if the magnetism is still strong and normal welding cannot be carried out at other places, the backing parts of 6 - 12 should be filled or filled + capped first to increase the magnetic flux so that normal welding can be carried out at other places. After normal welding of other places is completed, the welds of 6 - 12 places are welded again one by one.

[0050] Furthermore, a chute 31 is provided inside the movable chassis 10, and a threaded rod 32 is rotatably provided inside the chute 31. External threads with opposite helix directions are provided on both sides of the surface of the threaded rod 32; two movable blocks 33 are slidably provided inside the chute 31, and the tops of the two movable blocks 33 are respectively connected to the bottoms of the two movable plates 30. Threaded holes are provided inside the two movable blocks 33, and the surfaces of the threaded holes inside the two movable blocks 33 are threadedly connected to the surface of the threaded rod 32. A servo motor 34 is provided at the bottom of the movable chassis 10, and a driving block 35 is provided on one side of the servo motor 34. Two meshing transmission gears are provided inside the driving block 35, one of the transmission gears is internally connected to the output end of the servo motor 34, and the other transmission gear is internally connected to one end of the threaded rod 32.

[0051] It should be noted that the servo motor 34 and the driving block 35 are used in cooperation to drive the threaded rod 32 to rotate clockwise, so that the two movable blocks 33 move in opposite directions along the threaded rod 32 inside the chute 31. The two movable blocks 33 are used to drive the two movable plates 30 to move in opposite directions on the top of the movable chassis 10, so that the two movable frames 40 move away from each other, thus facilitating the degaussing and welding treatment of the pressure pipeline.

[0052] Meanwhile, the content not described in detail in this specification belongs to the well-known prior art in the art.

[0053] It should be noted that in this article, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic installation and welding process for pressure pipelines, characterized in that: Specifically, it includes the following steps: Step S1: Use the servo motor (34) and the driving block (35) to cooperate to drive the threaded rod (32) to rotate clockwise, so that the two movable blocks (33) move in opposite directions along the threaded rod (32) inside the chute (31). Use the two movable blocks (33) to drive the two movable plates (30) to move in opposite directions on the top of the movable chassis (10), so that the two movable frames (40) move away from each other, and place the pressure pipeline between the two movable frames (40). Use the micro-electric cylinder driving end inside the support frame (20) to push the limiting frame (50) upward, use the arc groove inside the limiting frame (50) to support the bottom of the pressure pipeline, and then use the micro-electric cylinder inside the limiting frame (50) to drive the two limiting plates (60) to clamp and limit the two sides of the pressure pipeline. Finally, control the two movable frames (40) to reset; Step S2: Detect the magnetism of the pressure pipeline. For those with weak magnetism, use the driving end of the second servo cylinder (22) to push the metal strip (21) to contact the surface of the pressure pipeline, connect the two sides of the bevel area of the pressure pipeline, so that the bevel area of the pressure pipeline changes from the original magnetic pole end to the magnet body area, and demagnetize the bevel area of the pressure pipeline; Step S3: For those with strong magnetism, use the electric slider (25) to drive the welding torch wire (26) to move along the spiral groove (23), so that the welding torch wire (26) winds around the surface of the pressure pipeline. Then, pass direct current into the welding torch wire (26) to generate magnetism, and adjust the magnitude and direction of the current to offset the magnetism of the pressure pipeline body; Step S4: Control one end of the second block (18) inside the front rotating frame (13) to insert into the rear rotating frame (13), and then control the first block (17) inside the rear rotating frame (13) to insert into the card slot (19) inside the second block (18). Use the cooperation connection of the first block (17) and the second block (18) inside the rear rotating frame (13) to realize the cooperation connection of the two rotating frames (13). Use the driving gear (16) to mesh with the teeth on one side of the rotating frame (13) to drive the two rotating frames (13) to rotate inside the two rotating grooves (12). Use the driving end of the first servo cylinder (15) to drive the welding torch (11) to approach the bevel of the pressure pipeline, and use the welding torch (11) to weld the bevel of the pressure pipeline.

2. A magnetic installation welding device for pressure pipelines, which is used to implement the magnetic installation welding process for pressure pipelines described in claim 1, and includes a movable chassis (10) and two support frames (20). The support frames (20) are arranged on both sides of the top of the movable chassis (10). It is characterized in that: On the front and rear sides of the top of the movable chassis (10), movable plates (30) are provided, and on the top of the two movable plates (30), movable frames (40) are provided. Inside the two movable frames (40), welding mechanisms are provided, and inside the two movable frames (40), demagnetizing mechanisms are also provided.

3. The magnetic installation and welding equipment for a pressure pipeline according to claim 2, characterized in that: Above the support frame (20), a limiting frame (50) is provided, and inside the limiting frame (50), an arc groove is provided. Inside the arc groove, two limiting plates (60) are slidably provided.

4. The magnetic installation and welding equipment for a pressure pipeline according to claim 2, characterized in that: The welding mechanism includes a welding torch (11). Rotation grooves (12) are provided inside both of the two movable frames (40), and rotation frames (13) are movably arranged inside the two rotation grooves (12). A connection block (14) is arranged on one side of the rotation frame (13) at the rear side, and a first servo cylinder (15) is arranged on one side of the connection block (14). The driving end of the first servo cylinder (15) is provided with a welding torch (11). A driving gear (16) is rotatably arranged inside the movable frame (40) at the rear side, and teeth meshing with the driving gear (16) are arranged on one side of the rotation frame (13). The surfaces of the driving gear (16) and the teeth are in meshing transmission.

5. The magnetic installation and welding equipment for a pressure pipeline according to claim 4, characterized in that: First clamping blocks (17) and second clamping blocks (18) are respectively arranged at the top and bottom of the rotation frame (13), and a clamping groove (19) matching with the first clamping block (17) is arranged inside the second clamping block (18). Electric push rods (110) are arranged above and below inside the movable frame (40), and magnetic stickers are arranged at the driving ends of the two electric push rods (110).

6. The magnetic installation and welding equipment for a pressure pipeline according to claim 2, characterized in that: The demagnetization assembly includes metal bars (21). A plurality of second servo cylinders (22) are arranged inside the movable frame (40), and the plurality of second servo cylinders (22) are symmetrically arranged with respect to the welding mechanism. The driving ends of the plurality of second servo cylinders (22) are all provided with metal bars (21), and one ends of the metal bars (21) on both sides of the welding mechanism are connected to each other.

7. A magnetic installation and welding device for a pressure pipeline according to claim 2, characterized in that: Spiral grooves (23) are arranged on both sides of the inner wall of the movable frame (40), and racks (24) are arranged on one side of the inner wall of the spiral grooves (23). Electric sliders (25) are movably arranged inside the spiral grooves (23), and the bottoms of the electric sliders (25) are in meshing transmission with the surfaces of the racks (24). One side of the electric slider (25) is provided with a welding electrode cable (26), and the other end of the welding electrode cable (26) is provided with a cable reel. A connecting piece (27) is arranged at one end of the spiral groove (23), and the connecting pieces (27) on both sides of the welding mechanism are electrically connected.

8. The magnetic installation and welding equipment for a pressure pipeline according to claim 2, characterized in that: A sliding groove (31) is arranged inside the movable bottom frame (10), and a threaded rod (32) is rotatably arranged inside the sliding groove (31). Two movable blocks (33) are slidably arranged inside the sliding groove (31), and the tops of the two movable blocks (33) are respectively connected to the bottoms of the two movable plates (30). Threaded holes are arranged inside the two movable blocks (33), and the surfaces of the threaded holes inside the two movable blocks (33) are threadedly connected to the surface of the threaded rod (32). A servo motor (34) is arranged at the bottom of the movable bottom frame (10), and a driving block (35) is arranged on one side of the servo motor (34).

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