A double-welded pipe welding forming device and method

Abstract

The application discloses a double-welding-line welding forming device and method for a building pipeline, relates to the field of pipeline welding, and comprises a rotating tool mechanism, an inner-outer double-line forming mechanism and a reinforcing groove forming mechanism. The rotating tool mechanism comprises oppositely arranged fixed and movable machine bases, and first and second three-jaw chucks are rotatably arranged on the fixed and movable machine bases respectively. The inner-outer double-line forming mechanism comprises a welding base, an outer welding ring and an inner welding ring. The outer welding ring, the first three-jaw chuck and the inner welding ring are coaxially arranged. First and second welding guns are arranged on the outer welding ring and the inner welding ring respectively. The first and second welding guns perform welding operations on the outer top wall and the inner bottom wall of the pipeline respectively. The reinforcing groove forming mechanism is used for forming a reinforcing groove penetrating along the radial direction on the welding end face of the pipeline. The inner-outer double-layer annular welding lines are formed at one time, and the welding rod formed in the reinforcing groove can connect the inner and outer annular welding lines, so that the welding strength is high.

Description

Technical Field

[0001] This invention relates to the field of pipe welding, specifically to a double-weld-seam welding forming device and method for building pipes. Background Technology

[0002] In modern building construction, metal pipes are widely used as the core transport carriers for water supply and drainage, fire protection, HVAC, and industrial pipeline systems. Large-diameter, high-pressure building pipelines are core components of municipal trunk networks, large building complex networks, and industrial pipelines. The welding quality of their butt welds directly determines the sealing performance, structural strength, and service life of the pipeline system, making it a crucial step in pipeline installation. Currently, butt welding of building metal pipelines, whether done manually on-site or in semi-automatic factory operations, generally employs a single-sided external wall single-weld process. This involves using a single welding torch to perform circumferential welding from the outside of the pipe, relying on the rotation of the pipe in conjunction with the welding torch to form the weld. This traditional process and equipment have many insurmountable technical defects in practical applications, especially for welding large pipelines, and are completely unable to meet the requirements of high-standard construction and long-term safe use.

[0003] First, the structural strength of single-weld structures is inherently insufficient, resulting in a serious lack of reliability in large pipeline connections. Traditional welding only forms a single circumferential weld layer on the outer wall of the pipe, without any simultaneous welding reinforcement structure on the inner wall. The weld only covers the surface of the outer wall, resulting in limited effective penetration depth, thin weld cross-section, and a single stress structure. For large-diameter, thicker-walled, and higher-pressure-bearing large-scale building pipelines, they must withstand higher internal water pressure impacts, strong stresses generated by thermal expansion and contraction of the medium, shear forces from external soil compression and foundation settlement, and continuous vibration loads during pipeline operation. The single-sided, single-weld structure is prone to severe stress concentration at the weld root and pipe wall junction. Compared to conventional small pipelines, the risk of weld cracking, leakage, joint detachment, and weld peeling in large pipelines increases exponentially, making it impossible to meet the structural strength and pressure-bearing standards required for large pipelines. Some construction companies have attempted to reinforce the inner walls of large pipelines through manual secondary welding. However, manual operation is difficult, the working environment is harsh, and it is impossible to achieve simultaneous formation of internal and external welds. Even after secondary welding, the high-strength connection requirements of large pipelines are still not met, and welding efficiency is significantly reduced, increasing construction costs. Finally, the lack of structural reinforcement at the pipeline joint surfaces makes it difficult for the welded bond strength to support the stress requirements of large pipelines. In traditional welding processes, the pipeline joint surfaces are all flat and smooth structures, and the weld molten metal only forms a fusion layer on the surface of the flat end surfaces, resulting in a small effective welded bonding area. For large pipelines subjected to high internal pressure and complex external forces, when subjected to bending, tension, or instantaneous pressure impact, the weld is very prone to overall peeling failure along the pipeline joint surface, resulting in extremely poor connection stability.

[0004] In summary, the traditional single-weld process and equipment for building pipelines have many technical drawbacks, such as insufficient weld strength, lack of end-face reinforcement, and low process integration. In particular, in the welding application of large-scale high-pressure building pipelines, the strength shortcomings of the single-weld process are further amplified, and it is completely unable to meet the connection requirements of high strength, high sealing performance, and high reliability. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a double-weld-seam welding forming device and method for building pipelines, which solves the shortcomings of the prior art.

[0006] The objective of this invention is achieved through the following technical solution: a double-seam welding forming device for building pipelines, comprising a rotating tooling mechanism, an inner and outer double-seam forming mechanism, and a reinforcing groove forming mechanism. The rotating tooling mechanism includes a fixed base and a movable base arranged opposite to each other. A first three-jaw chuck and a second three-jaw chuck are rotatably mounted on the fixed base and the movable base, respectively. The second three-jaw chuck is coaxial with the first three-jaw chuck. The inner and outer double-seam forming mechanism includes a welding base, an outer welding ring, and an inner welding ring. Both the welding base and the movable base have the freedom to move axially along the first three-jaw chuck. The outer welding ring is located at... Between the fixed base and the movable base, the outer welding ring, the first three-jaw chuck, and the inner welding ring are coaxially arranged. A first welding gun and a second welding gun are respectively installed on the outer welding ring and the inner welding ring. The first welding gun and the second welding gun perform welding operations simultaneously on the outer top wall and the inner bottom wall of the pipe, respectively. The reinforcing groove forming mechanism includes a forming disc, a rotating shaft, and a friction sleeve. The forming disc is detachably connected to the second three-jaw chuck. The forming disc is rotatably mounted with multiple rotating shafts along its own circumference. A friction sleeve is fixedly sleeved on the rotating shaft. The friction sleeve is used to create a radially penetrating reinforcing groove on the welding end face of the pipe.

[0007] Furthermore, the axial end face of the forming disc is provided with a receiving groove, and each of the rotating shafts is provided with a receiving groove. The friction sleeve is located in the receiving groove and partially protrudes from the receiving groove. The forming disc is provided with a driving cavity, and a main shaft is rotatably arranged in the driving cavity. A helical gear disk is fitted on the main shaft. One end of the rotating shaft passes through the driving cavity and is connected to a helical gear. The helical gear meshes with the helical gear disk. A first motor is installed on the outer wall of the forming disc, and the output shaft of the first motor is connected to one of the rotating shafts for transmission.

[0008] Furthermore, a first flange is fixedly mounted on the forming disc, and a threaded hole is provided on the end face of the second three-jaw chuck near the fixed base. The first flange is connected to the second three-jaw chuck by a screw, the screw thread being adapted to the threaded hole. An clearance groove is provided on the forming disc to accommodate the jaws of the second three-jaw chuck.

[0009] Furthermore, an outer arc-shaped heating plate is installed on the inner bottom wall of the outer welding ring, and an inner arc-shaped heating plate is installed on the outer top wall of the inner welding ring. Multiple electric heating wires are installed inside both the inner and outer arc-shaped heating plates. During welding, the outer arc-shaped heating plate faces the second welding torch to melt the welding liquid at the second welding torch so that it can overflow downwards, and the inner arc-shaped heating plate faces the first welding torch to melt the welding liquid at the first welding torch so that it can overflow downwards.

[0010] Furthermore, the inner wall of the outer welding ring is provided with a first mounting groove, a first lead screw is rotatably disposed in the first mounting groove, a first sliding sleeve is threaded onto the first lead screw, the first sliding sleeve is connected to an outer arc-shaped heating plate, the outer arc-shaped heating plate is connected to a first guide rod, the outer welding ring is provided with a first guide hole at the position corresponding to the first guide rod, the first guide rod is slidably adapted to the first guide hole, the outer wall of the inner welding ring is provided with a second mounting groove, a second lead screw is rotatably disposed in the second mounting groove, a second sliding sleeve is threaded onto the second lead screw, the second sliding sleeve is connected to an inner arc-shaped heating plate, the inner arc-shaped heating plate is connected to a second guide rod, the inner welding ring is provided with a second guide hole at the position corresponding to the second guide rod, the second guide rod is slidably adapted to the second guide hole.

[0011] Furthermore, a first cooling chamber is provided on one side of the first mounting groove inside the outer welding ring, and a plurality of first air holes are opened on the inner wall of the outer welding ring, the first air holes being connected to the first cooling chamber. A second cooling chamber is provided on one side of the second mounting groove inside the inner welding ring, and a plurality of second air holes are opened on the outer wall of the inner welding ring, the second air holes being connected to the second cooling chamber.

[0012] Furthermore, the outer welding ring has a first welding gun hole on its side wall that connects to its inner ring. A first welding gun adjusting rod is slidably disposed in the first welding gun hole, and the first welding gun is mounted on the first welding gun adjusting rod. A first locking screw is threaded onto the outer welding ring, and the first locking screw abuts against the first welding gun adjusting rod. The inner welding ring has a second welding gun hole on its side wall that connects to its inner ring. A second welding gun adjusting rod is slidably disposed in the second welding gun hole, and the second welding gun is mounted on the second welding gun adjusting rod. A second locking screw is threaded onto the inner welding ring, and the second locking screw passes through the second welding gun hole and abuts against the second welding gun adjusting rod.

[0013] Furthermore, it also includes a base, the fixed base is fixed on the base, a first cylinder is horizontally mounted on the base, the telescopic shaft of the first cylinder is connected to the movable base, the fixed base has a first bearing hole, a first bearing is assembled in the first bearing hole, a first hollow shaft is assembled on the inner ring of the first bearing, a first three-jaw chuck is coaxially mounted on the first hollow shaft, a first external gear ring is fitted on the first hollow shaft, a first drive window communicating with the first bearing hole is opened on the side wall of the fixed base, a first transmission gear is rotatably arranged in the first drive window, the first transmission gear meshes with the first external gear ring, a second bearing hole is opened on the movable base, a second bearing is assembled in the second bearing hole, and a second internal gear ring is assembled on the inner ring of the second bearing. A hollow shaft is formed, and the second three-jaw chuck is coaxially mounted on the second hollow shaft. A second external gear ring is fitted on the second hollow shaft. A second drive window communicating with a second bearing hole is opened on the side wall of the movable base. A second transmission gear is rotatably arranged in the second drive window and meshes with the second external gear ring. A drive box is provided on the base, and a drive shaft is rotatably arranged in the drive box. A long shaft gear is fitted on the drive shaft. The drive box has drive windows at positions corresponding to the first and second transmission gears. Both the first and second transmission gears mesh with the long shaft gear. A second motor is installed at one end of the drive box, and the output shaft of the second motor is connected to the drive shaft. A notch for the drive box to pass through is opened on the outer welded ring.

[0014] Furthermore, a second cylinder is horizontally mounted on the base, the telescopic shaft of the second cylinder is connected to the welding machine base, the inner welding ring is connected to the welding machine base through multiple adjustable rods, the side wall of the outer welding ring is connected to the telescopic shaft of the third cylinder, the cylinder body of the third cylinder is mounted on the base, and the third cylinder is perpendicular to the second cylinder.

[0015] A method for forming a double-weld seam of a building pipeline, utilizing the aforementioned double-weld seam welding forming device for building pipelines, includes the following steps:

[0016] S1. First, install one of the pipe fittings on the first three-jaw chuck, and install the forming disc on the second three-jaw chuck. Then, process the reinforcing groove on the welding end face of the pipe by friction.

[0017] S2. Remove the forming plate and place the other pipe fitting on the second and third jaw chucks;

[0018] S3. Move the movable base to make the welding end faces of the two pipes contact to form an annular weld, and adjust the position of the two pipes so that the annular weld is located directly below the first welding gun.

[0019] S4. The welding machine base moves the inner welding ring, causing the inner welding ring to pass into the pipe and the second welding gun to correspond to the annular weld of the pipe.

[0020] S5. The first welding torch always welds the outer top position of the annular weld, while the second welding torch always welds the inner top position of the annular weld. By rotating the second three-jaw chuck and the first three-jaw chuck, the two pipes rotate synchronously to form two annular welds on the pipes.

[0021] S6. Under the action of the reinforcement tank and with the gravity of the welding liquid itself, the welding liquid can flow downward. The welding liquid flows into the reinforcement tank and can form several linear welding strips on the welding end faces of the two pipes. The linear welding strips connect the two circumferential welds to form welding reinforcement ribs.

[0022] S7. Remove the welded pipe and repeat steps S1-S6 above to weld the next pipe.

[0023] The beneficial effects of this invention are:

[0024] 1. Employing a coaxial structure with an outer and inner welding ring, each equipped with a first and second welding torch, this method simultaneously forms both an outer and inner circumferential weld seams at the pipeline welding location, creating a double-layered circumferential weld seam in a single operation. Compared to traditional single-sided, single-weld-seam processes, the simultaneous melting and forming of the inner and outer weld seams effectively increases weld penetration and stress area, dispersing internal water pressure, thermal expansion and contraction stress, foundation settlement shear force, and concentrated stress caused by operational vibrations.

[0025] 2. A reinforcing groove is provided on one of the pipes. The first and second welding torches are installed vertically for welding operations, allowing the welding molten metal to overflow downwards under its own weight. Especially at the reinforcing groove, the welding molten metal enters the groove and acts on the welding end faces of the two pipes, forming end face welding, which further increases the welding area. At the same time, the welding rod formed in the reinforcing groove can connect the inner and outer two annular welds to form welding reinforcing ribs, thereby greatly improving the welding strength of the two pipes. This can effectively prevent the weld from peeling off along the flat end face of the butt joint, and further improve the tensile, bending and impact resistance of the weld position. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a double-weld-seam welding forming device for building pipes according to the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of a double-weld-seam welding forming device for building pipes according to the present invention. Figure 2 ;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the internal structure of the outer welding ring in a double-weld-seam welding forming device for building pipes according to the present invention.

[0030] Figure 5 This is a schematic diagram of the internal structure of the inner welding ring in a double-weld-seam welding forming device for building pipes according to the present invention.

[0031] Figure 6 This is a schematic diagram of the forming disc in a double-weld-seam welding forming device for building pipes according to the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of a double-weld-seam welding forming device for building pipes according to the present invention. Figure 3 ;

[0033] Figure 8 This is a schematic diagram of the drive mechanism for the fixed base and the movable base in a double-weld-seam welding forming device for building pipes according to the present invention.

[0034] In the diagram, 1-fixed base, 2-movable base, 3-first three-jaw chuck, 4-second three-jaw chuck, 5-welding base, 6-outer welding ring, 7-inner welding ring, 8-first welding torch, 9-second welding torch, 10-forming plate, 11-rotating shaft, 12-friction sleeve, 13-accommodating groove, 14-drive cavity, 15-spindle, 16-helical gear plate, 17-helical gear, 18-first motor, 19-first flange, 20-screw, 21-outer arc-shaped heating plate, 22-inner arc-shaped heating plate, 23-first mounting groove, 24-first lead screw, 25-first sliding sleeve, 27-first guide rod, 28-first guide hole, 29-second mounting groove, 30-second lead screw, 31-second sliding sleeve, 32-second guide rod, 33-second guide hole, 34-first... 35-First welding torch hole, 36-First locking screw, 37-Second welding torch hole, 38-Second welding torch adjusting rod, 39-Second locking screw, 40-First cooling chamber, 41-First air hole, 42-Second cooling chamber, 43-Second air hole, 44-First bearing hole, 45-First hollow shaft, 46-First external gear ring, 47-First drive window, 48-First transmission gear, 49-Second bearing hole, 50-Second hollow shaft, 51-Second external gear ring, 52-Second drive window, 53-Second transmission gear, 54-Base, 55-First cylinder, 56-Drive box, 57-Drive shaft, 58-Long shaft gear, 59-Second motor, 60-Second cylinder, 61-Flange rod, 62-Second flange, 63-Third cylinder. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0036] Example 1

[0037] like Figures 1 to 8As shown, a double-seam welding forming device for building pipelines includes a rotating tooling mechanism, an inner and outer double-seam forming mechanism, and a reinforcing groove forming mechanism. The rotating tooling mechanism includes a fixed base 1 and a movable base 2 arranged opposite to each other. A first three-jaw chuck 3 and a second three-jaw chuck 4 are rotatably mounted on the fixed base 1 and the movable base 2, respectively. The second three-jaw chuck 4 is coaxial with the first three-jaw chuck 3. The inner and outer double-seam forming mechanism includes a welding base 5, an outer welding ring 6, and an inner welding ring 7. Both the welding base 5 and the movable base 2 have the freedom to move along the axial direction of the first three-jaw chuck 3. The outer welding ring 6 is located between the fixed base 1 and the movable base 2. The outer welding ring 6, the first three-jaw chuck 3, and the inner welding ring 7 are coaxially arranged. A first welding torch 8 and a second welding torch 9 are respectively mounted on the outer welding ring 6 and the inner welding ring 7. The first welding torch 8 and the second welding torch 9 perform welding operations simultaneously on the outer top wall and the inner bottom wall of the pipeline, respectively. The reinforcing groove forming mechanism includes a forming disc 10, a rotating shaft 11, and a friction sleeve 12. The forming disc 10 is detachably connected to the second three-jaw chuck 4. Multiple rotating shafts 11 are mounted on the forming disc 10 in a circumferential direction. The friction sleeve 12 is fixedly sleeved on the rotating shaft 11. The friction sleeve 12 is used to create a radially penetrating reinforcing groove on the welding end face of the pipe. The reinforcing groove is first processed on the welding end face of one of the pipes. The reinforcing groove is set through the pipe, which can connect the inner and outer annular welds together and form a welding surface on the contact end face of the two pipes, which greatly increases the welding area of ​​the two pipes. The welding rod formed in the reinforcing groove can connect the inner and outer annular welds to form a welding reinforcing rib, thereby greatly improving the welding strength of the two pipes. It can effectively prevent the weld from peeling off along the flat end face of the butt joint, and further improve the tensile, bending and impact resistance of the welding position.The specific forming process of the reinforcement groove is as follows: First, one of the pipes is inserted into the first three-jaw chuck 3, and the pipe is centered and clamped by the first three-jaw chuck 3. When tooling this pipe, the relative position of the pipe and the first welding torch 8 needs to be positioned so that the welding port of the first welding torch 8 is directly opposite the welding end face of the pipe. Then, the forming plate 10 is installed on the end of the second three-jaw chuck 4 near the fixed base 1. The friction sleeve 12 is rotated by the rotating shaft 11, and the friction sleeve 12 is moved closer to the end face of the pipe by the movable base 2, so that the friction sleeve 12 contacts the end face of the pipe, thereby forming a reinforcement groove on the end face of the pipe by grinding. Then, the forming plate 10 is removed and centered by the second three-jaw chuck 4. Holding another pipe, ensuring high coaxiality between the two pipes, the welding base 5 moves the inner welding ring 7 into the pipe, aligning the end face of the inner welding ring 7 with the end face of the outer welding ring 6, thus quickly positioning the second welding torch 9. At this point, the second welding torch 9 naturally aligns with the annular weld seam of the pipe. Then, the movable base 2 moves closer to the fixed base 1, bringing the two pipes into contact. The contact end faces of the two pipes form an annular weld seam. The first welding torch 8 and the second welding torch 9 are activated, and simultaneously, the first three-jaw chuck 3 and the second three-jaw chuck 4 rotate synchronously, causing the two pipes to rotate synchronously, thereby simultaneously forming an outer wall annular weld seam and an inner wall annular weld seam on the pipe, forming a double-layer annular weld seam in one go. Compared to the traditional single-sided single-weld process, the simultaneous melting and forming of the inner and outer welds effectively increases the weld penetration and stress area, dispersing the concentrated stress caused by water pressure, thermal expansion and contraction stress, foundation settlement shear force, and operational vibration inside the pipeline. Since the welding position of the first welding gun 8 is always located at the outer top of the pipeline and the welding position of the second welding gun 9 is always located at the inner bottom of the pipeline, the welding liquid can overflow downwards under its own gravity. When welding to the reinforcement groove position, the welding liquid will enter the reinforcement groove, so that the welding liquid acts on the welding end face of the two pipelines to form end face welding, further increasing the welding area. At the same time, the welding rod formed in the reinforcement groove can connect the inner and outer two annular welds to form welding reinforcing ribs, thereby greatly improving the welding strength of the two pipelines and meeting the load requirements of large pipelines.

[0038] Example 2

[0039] Because the welding molten metal solidifies very easily, it may solidify before flowing into the reinforcement tank, preventing the welding rods in the tank from connecting the inner and outer circumferential welds. Therefore, based on Example 1, as follows... Figures 1 to 5As shown, an outer arc-shaped heating plate 21 is installed on the inner bottom wall of the outer welding ring 6, and an inner arc-shaped heating plate 22 is installed on the outer top wall of the inner welding ring 7. Multiple electric heating wires are installed in both the inner arc-shaped heating plate 22 and the outer arc-shaped heating plate 21. During welding, the outer arc-shaped heating plate 21 faces the second welding torch 9 to melt the welding liquid at the second welding torch 9, allowing it to overflow downwards. The inner arc-shaped heating plate 22 faces the first welding torch 8 to melt the welding liquid at the first welding torch 8, allowing it to overflow downwards. The outer arc-shaped heating plate 21 on the outer welding ring 6 heats the outer wall of the pipe, with its heating position directly below the second welding torch 9, thus enabling the second welding torch 9 to... The molten welding liquid from the second welding torch 9 remains in a liquid state. The inner wall of the pipe is heated by the inner arc-shaped heating plate 22 on the inner welding ring 7, which is located directly below the first welding torch 8. This keeps the molten welding liquid from the first welding torch 8 in a liquid state, allowing the welding liquid in the reinforcement tank to flow downwards under its own gravity, filling the reinforcement tank with welding liquid. The welding liquid solidifies into welding rods in the reinforcement tank. After the two annular welds are completed, the inner and outer annular welds connect to the welding rods in the reinforcement tank, thereby strengthening the welding strength and forming a welding surface at the contact end of the two pipes, increasing the welding contact area of ​​the two pipes and further strengthening the welding strength.

[0040] Example 3

[0041] Based on Example 2, the width of the reinforcing groove is smaller, preferably 4-6mm, so that the welding liquid in the reinforcing groove can not drip out under its own tension. Secondly, the multiple reinforcing grooves formed by the pipe are evenly distributed around the circumference. The first three-jaw chuck 3 and the second three-jaw chuck 4 rotate intermittently, so that when the reinforcing groove corresponds to the welding position, the pipe stops rotating for a certain period of time, so that the first welding gun 8 and the second welding gun 9 melt more welding liquid, so that the welding liquid flows into the reinforcing groove, and the welding rod used to connect the inner and outer annular welds can be smoothly formed in the reinforcing groove.

[0042] Example 4

[0043] Based on Example 3, such as Figures 1 to 5As shown, the inner wall of the outer welded ring 6 has a first mounting groove 23, and a first lead screw 24 is rotatably mounted in the first mounting groove 23. A first sliding sleeve 25 is threaded onto the first lead screw 24, and the first sliding sleeve 25 is connected to the outer arc-shaped heating plate 21. The outer arc-shaped heating plate 21 is connected to a first guide rod 27. The outer welded ring 6 has a first guide hole 28 at the position corresponding to the first guide rod 27, and the first guide rod 27 slides to fit into the first guide hole 28. The outer wall of the inner welded ring 7 has a second mounting groove 23. A second lead screw 30 is rotatably mounted in the second mounting groove 29. A second sliding sleeve 31 is threaded onto the second lead screw 30. The second sliding sleeve 31 is connected to the inner arc-shaped heating plate 22. The inner arc-shaped heating plate 22 is connected to a second guide rod 32. The inner welding ring 7 has a second guide hole 33 at the position corresponding to the second guide rod 32. The second guide rod 32 slides and adapts to the second guide hole 33. One end of the first lead screw passes through the outer wall of the outer welding ring 6 and is connected to a first nut. The second lead screw 30... One end of the inner ring of the inner welding ring 7 is connected to a second nut. The positions of the outer arc heating plate 21 and the inner arc heating plate 22 can be adjusted according to the pipe diameter, so that the outer arc heating plate 21 is close to or in contact with the outer wall of the pipe, and the inner arc heating plate 22 is close to or in contact with the inner wall of the pipe. This can quickly heat the welding area of ​​the pipe to melt the solder and generate flow. The specific adjustment method is as follows: adjust the positions of the inner arc heating plate 22 and the outer arc heating plate 21 according to the inner and outer diameter of the pipe to be welded. Use a wrench to turn the first nut, which drives the first lead screw 24 to rotate. Under the guidance of the first guide rod 27, the first sliding sleeve 25 moves linearly along the axis of the first lead screw 24, thereby driving the outer arc heating plate 21 to move closer to the outer wall of the pipe. Similarly, turn the second nut to drive the second lead screw 30 to rotate. Under the guidance of the second guide rod 32, the second sliding sleeve 31 moves linearly along the axis of the second lead screw 30, thereby driving the inner arc heating plate 22 to move closer to the inner wall of the pipe.

[0044] Example 5

[0045] Based on Example 4, such as Figures 1 to 5As shown, the outer welding ring 6 has a first welding gun hole 34 on its side wall, which connects to its inner ring. A first welding gun adjusting rod 35 is slidably disposed in the first welding gun hole 34. A first welding gun 8 is mounted on the first welding gun adjusting rod 35. A first locking screw 36 is threadedly connected to the outer welding ring 6, and the first locking screw 36 abuts against the first welding gun adjusting rod 35. The inner welding ring 7 has a second welding gun hole 37 on its side wall, which connects to its inner ring. A second welding gun adjusting rod 38 is slidably disposed in the second welding gun hole 37. A second welding gun 9 is mounted on the second welding gun adjusting rod 38. A second locking screw 39 is threadedly connected to the inner welding ring 7, and the second locking screw 39 passes through the second welding gun hole 37 and abuts against the second welding gun adjusting rod 38. Both the first welding gun 8 and the second welding gun 9 need to be close to the weld seam of the pipe to achieve a weld. For efficient welding, the positions of the first welding torch 8 and the second welding torch 9 can be adjusted to achieve effective welding of pipes of different sizes. The specific adjustment process is as follows: Loosen the first locking screw 36, and then slide the first welding torch adjusting rod 35 up and down to adjust the welding height of the first welding torch 8 so that the nozzle of the first welding torch 8 is close to the weld seam of the pipe. After adjustment, tighten the first locking screw 36 to lock the position of the first welding torch 8. Similarly, loosen the second locking screw 39, and then slide the second welding torch adjusting rod 38 to adjust the welding height of the second welding torch 9 so that the nozzle of the second welding torch 9 is close to the weld seam of the pipe. Finally, tighten the second locking screw 39 to lock the position of the second welding torch 9. This method has the advantages of being simple and quick to operate and can adapt to the welding of pipes of various sizes.

[0046] Example 6

[0047] Due to the arrangement of the outer arc-shaped heating plate 21 and the inner arc-shaped heating plate 22, the welding position of the pipe has a high temperature after welding. On the one hand, this results in the weld not fully solidifying, leading to low connection strength and making it easy for local detachment to occur during material handling. On the other hand, the high temperature makes it inconvenient for workers to handle materials, easily causing burns. Therefore, based on Embodiment 5, as... Figures 1 to 5As shown, a first cooling chamber 40 is provided inside the outer welding ring 6 on one side of the first mounting groove 23. Several first air holes 41 are formed on the inner wall of the outer welding ring 6, and the first air holes 41 connect to the first cooling chamber 40. A second cooling chamber 42 is provided inside the inner welding ring 7 on one side of the second mounting groove 29. Several second air holes 43 are formed on the outer wall of the inner welding ring 7, and the second air holes 43 connect to the second cooling chamber 42. Both the outer welding ring 6 and the inner welding ring 7 are connected to an air supply device via air pipes. The air supply device can be an axial flow fan, an air pump, or an air compressor. After the two pipes are welded, the air supply equipment introduces cold air from the outside into the first cooling chamber 40 and the second cooling chamber 42. Part of the cold air is blown out from the first air hole 41 and acts on the outer wall of the pipe, while the other part of the cold air is blown out from the second air hole 43 and acts on the inner wall of the pipe. With the rotation of the pipe, the inner and outer annular welds can be cooled at the same time, which can quickly reduce the temperature of the pipe welding position, so that the weld can be completely solidified, and the pipe cutting will not affect the welding quality, while ensuring the safety of pipe cutting.

[0048] Example 7

[0049] Based on Example 6, such as Figures 1 to 6As shown, the axial end face of the forming disk 10 is provided with a receiving groove 13. Each rotating shaft 11 is provided with a receiving groove 13. The friction sleeve 12 is located in the receiving groove 13 and partially protrudes from the receiving groove 13. The forming disk 10 is provided with a driving cavity 14. A main shaft 15 is rotatably arranged in the driving cavity 14. A helical gear disk 16 is fitted on the main shaft 15. One end of the rotating shaft 11 passes through the driving cavity 14 and is connected to a helical gear 17. The helical gear 17 meshes with the helical gear disk 16. A first motor 18 is installed on the outer wall of the forming disk 10. The output shaft of the first motor 18 is connected to one of the rotating shafts 11 for transmission. A first flange 19 is fixedly fitted on the forming disk 10. A threaded hole is provided on the end face of the second three-jaw chuck 4 near the fixed base 1. The first flange 19 is connected to the second three-jaw chuck 4 through a screw 20. The screw 20 is threaded to fit a threaded hole. A clearance groove is provided on the forming disc 10 to accommodate the jaws of the second three-jaw chuck 4. The forming disc 10 is connected to the second three-jaw chuck 4 via the screw 20, offering the advantage of easy assembly and disassembly. During the forming and curing process, the forming disc 10 is installed on the second three-jaw chuck 4, and the first motor 18 is started. The first motor drives the connected rotating shaft 11 to rotate, which in turn drives the helical gear disc 16 to rotate. The helical gear disc 16 drives the remaining rotating shafts 11 to rotate, which in turn drives the friction sleeves 12 to rotate. Thus, a single power source drives all the friction sleeves 12 to rotate. The movable base 2 moves the friction sleeves 12 closer to the end face of the pipe, thereby grinding a reinforcing groove on the end face of the pipe. After the reinforcing groove is processed, the forming disc 10 is removed for welding. In specific implementation, four friction sleeves 12 are preferably arranged, evenly distributed around the circumference, thus creating four reinforcing grooves on the end face of the pipe. This strengthens the welding strength without affecting the structural strength of the pipe itself.

[0050] Example 8

[0051] Based on Example 7, such as Figures 1 to 8As shown, it also includes a base 54, a fixed base 1 fixed on the base 54, a first cylinder 55 horizontally mounted on the base 54, the telescopic shaft of the first cylinder 55 connected to the movable base 2, a first bearing hole 44 opened on the fixed base 1, a first bearing assembled in the first bearing hole 44, a first hollow shaft 45 assembled on the inner ring of the first bearing, a first three-jaw chuck 3 coaxially mounted on the first hollow shaft 45, a first external gear ring 46 fitted on the first hollow shaft 45, a first drive window 47 communicating with the first bearing hole 44 opened on the side wall of the fixed base 1, and a rotating device is installed in the first drive window 47. A first transmission gear 48 is provided, which meshes with a first external gear ring 46. A second bearing hole 49 is provided on the movable base 2, and a second bearing is installed in the second bearing hole 49. A second hollow shaft 50 is installed on the inner ring of the second bearing. A second three-jaw chuck 4 is coaxially mounted on the second hollow shaft 50. A second external gear ring 51 is fitted on the second hollow shaft 50. A second drive window 52 is provided on the side wall of the movable base 2, which communicates with the second bearing hole 49. A second transmission gear 53 is rotatably arranged in the second drive window 52, ​​and the second transmission gear 53 meshes with the second external gear ring 51. The base 5... A drive housing 56 is provided on the drive housing 4. A drive shaft 57 is rotatably mounted inside the drive housing 56. A long shaft gear 58 is mounted on the drive shaft 57. The drive housing 56 has drive windows at positions corresponding to the first transmission gear 48 and the second transmission gear 53. Both the first transmission gear 48 and the second transmission gear 53 mesh with the long shaft gear 58. A second motor 59 is installed at one end of the drive housing 56. The output shaft of the second motor 59 is connected to the drive shaft 57. A notch is provided on the outer welded ring 6 for the drive housing 56 to pass through. The second motor 59 drives the drive shaft 57 to rotate, and the drive shaft 57 drives the long shaft gear 58. When wheel 58 rotates, the long-shaft gear 58 simultaneously drives the first transmission gear 48 and the second transmission gear 53 to rotate. The first transmission gear 48, through meshing with the first external gear ring 46, drives the first hollow shaft 45 to rotate. The first hollow shaft 45 drives the first three-jaw chuck 3 to rotate. The second transmission gear 53, through meshing with the second external gear ring 51, drives the second hollow shaft 50 to rotate. The second hollow shaft 50 drives the second three-jaw chuck 4 to rotate, thereby achieving synchronous rotation of the two pipes and avoiding the problem of asynchrony caused by separate driving of two power sources, ensuring that the pipe welding will not be detached due to torque. The extension and retraction of the first cylinder 55 drives the movable base 2 to move on the base 54. During the movement, the second transmission gear 53 slides on the long-shaft gear 58, but always remains engaged, thus not affecting the subsequent rotational welding operation of the pipes.In practice, grinding debris is generated during the processing of the reinforcing groove. To prevent the grinding debris from entering the drive box 56 and affecting the transmission, the movable base 2 contacts the drive box 56 to block the drive window corresponding to the second transmission gear 53. The movable base 2 can always close the drive window corresponding to the second transmission gear 53 during the movement process. The fixed base 1 contacts the drive box 56 to close the drive window corresponding to the first transmission gear 48, thereby preventing the grinding debris from entering the drive box 56.

[0052] Example 9

[0053] Based on Example 8, such as Figures 1 to 7 As shown, a second cylinder 60 is horizontally mounted on the base 54. The telescopic shaft of the second cylinder 60 is connected to the welding machine base 5. The inner welding ring 7 is connected to the welding machine base 5 through multiple adjustable rods. The side wall of the outer welding ring 6 is connected to the telescopic shaft of the third cylinder 63. The cylinder body of the third cylinder 63 is mounted on the base 54 and is perpendicular to the second cylinder 60. The adjustable rods include multiple flange rods 61, and both ends of the flange rods 61 are fixed with second flanges 62. Adjacent flange rods 61 are detachably connected through the second flanges 62. The two ends of the component are respectively connected to the inner welding ring 7 and the welding machine base 5. The length of the adjustable rod is controlled by adjusting the number of flange rods 61. The length of the adjustable rod is adjusted according to the axial length of the pipe. Then, the extension and retraction of the second cylinder 60 drives the welding machine base 5 to move, so that the inner welding ring 7 can move to the welding position of the pipe for welding operation. The third cylinder 63 drives the outer welding ring 6 to move along the axial direction perpendicular to the pipe. When grinding the reinforcing groove, the outer welding ring 6 can be pushed back to one side of the pipe so that the outer welding ring 6 will not block the forming disc 10.

[0054] Example 10

[0055] Based on Embodiment Nine, a method for forming a double-weld seam of a building pipeline, utilizing the aforementioned double-weld seam welding forming device for building pipelines, includes the following steps:

[0056] S1. First, install one of the pipe fittings on the first three-jaw chuck 3, install the forming disc 10 on the second three-jaw chuck 4, and process the reinforcing groove on the welding end face of the pipe through the friction sleeve 12.

[0057] S2. Remove the forming plate 10 and place the other pipe fixture on the second three-jaw chuck 4;

[0058] S3. The movable base 2 moves so that the welding end faces of the two pipes come into contact to form an annular weld, and the position of the two pipes is adjusted so that the annular weld is located directly below the first welding gun 8.

[0059] S4. The welding machine base 5 drives the inner welding ring 7 to move, so that the inner welding ring 7 passes into the pipe and the second welding gun 9 corresponds to the annular weld of the pipe.

[0060] S5. The first welding torch 8 always welds the outer top position of the annular weld, while the second welding torch 9 always welds the inner top position of the annular weld. By rotating the second three-jaw chuck 4 and the first three-jaw chuck 3, the two pipes rotate synchronously to form two annular welds on the pipes.

[0061] S6. Under the action of the reinforcement tank and with the gravity of the welding liquid itself, the welding liquid can flow downward. The welding liquid flows into the reinforcement tank and can form several linear welding strips on the welding end faces of the two pipes. The linear welding strips connect the two circumferential welds to form welding reinforcement ribs.

[0062] S7. Remove the welded pipe and repeat steps S1-S6 above to weld the next pipe.

Claims

1. A double-weld-seam welding forming device for building pipes, characterized in that, The system includes a rotating tooling mechanism, an inner and outer double-slit forming mechanism, and a reinforcing groove forming mechanism. The rotating tooling mechanism comprises a fixed base and a movable base arranged opposite each other. A first three-jaw chuck and a second three-jaw chuck are rotatably mounted on the fixed base and the movable base, respectively. The second three-jaw chuck is coaxial with the first three-jaw chuck. The inner and outer double-slit forming mechanism includes a welding base, an outer welding ring, and an inner welding ring. Both the welding base and the movable base have the freedom to move along the axial direction of the first three-jaw chuck. The outer welding ring is located between the fixed base and the movable base. The first three-jaw chuck is coaxially arranged with the inner welding ring. The first welding gun and the second welding gun are respectively installed on the outer welding ring and the inner welding ring. The first welding gun and the second welding gun perform welding operations simultaneously on the outer top wall and the inner bottom wall of the pipe. The reinforcing groove forming mechanism includes a forming plate, a rotating shaft and a friction sleeve. The forming plate is detachably connected to the second three-jaw chuck. The forming plate is rotatably mounted with multiple rotating shafts along its own circumference. A friction sleeve is fixedly sleeved on the rotating shaft. The friction sleeve is used to create a radially penetrating reinforcing groove on the welding end face of the pipe. The axial end face of the forming disk is provided with a receiving groove, and each of the rotating shafts is provided with a receiving groove. The friction sleeve is located in the receiving groove and partially protrudes from the receiving groove. The forming disk is provided with a driving cavity, and a main shaft is rotatably arranged in the driving cavity. A helical gear disk is fitted on the main shaft. One end of the rotating shaft passes through the driving cavity and is connected to a helical gear. The helical gear meshes with the helical gear disk. A first motor is installed on the outer wall of the forming disk, and the output shaft of the first motor is connected to one of the rotating shafts for transmission. A first flange is fixedly mounted on the forming disc. A threaded hole is provided on the end face of the second three-jaw chuck near the fixed base. The first flange is connected to the second three-jaw chuck by a screw. The screw thread is adapted to the threaded hole. A clearance groove is provided on the forming disc to accommodate the jaws of the second three-jaw chuck. An outer arc-shaped heating plate is installed on the inner bottom wall of the outer welding ring, and an inner arc-shaped heating plate is installed on the outer top wall of the inner welding ring. Multiple electric heating wires are installed in both the inner and outer arc-shaped heating plates. During welding, the outer arc-shaped heating plate is directly opposite the second welding torch to melt the welding liquid at the second welding torch so that it can overflow downwards. The inner arc-shaped heating plate is directly opposite the first welding torch to melt the welding liquid at the first welding torch so that it can overflow downwards. The inner wall of the outer welding ring has a first mounting groove, in which a first lead screw is rotatably mounted. A first sliding sleeve is threaded onto the first lead screw, which is connected to an outer arc-shaped heating plate. The outer arc-shaped heating plate is connected to a first guide rod, and the outer welding ring has a first guide hole at the position corresponding to the first guide rod. The first guide rod slides into the first guide hole. The outer wall of the inner welding ring has a second mounting groove, in which a second lead screw is rotatably mounted. A second sliding sleeve is threaded onto the second lead screw, which is connected to an inner arc-shaped heating plate. The inner arc-shaped heating plate is connected to a second guide rod, and the inner welding ring has a second guide hole at the position corresponding to the second guide rod. The second guide rod slides into the second guide hole. The outer welding ring has a first cooling chamber on one side of the first mounting groove, and the inner wall of the outer welding ring has a plurality of first air holes, which are connected to the first cooling chamber. The inner welding ring has a second cooling chamber on one side of the second mounting groove, and the outer wall of the inner welding ring has a plurality of second air holes, which are connected to the second cooling chamber.

2. The double-weld-seam welding forming device for building pipelines according to claim 1, characterized in that, The outer welding ring has a first welding gun hole on its side wall that connects to its inner ring. A first welding gun adjusting rod is slidably disposed in the first welding gun hole, and the first welding gun is mounted on the first welding gun adjusting rod. A first locking screw is threaded onto the outer welding ring, and the first locking screw abuts against the first welding gun adjusting rod. The inner welding ring has a second welding gun hole on its side wall that connects to its inner ring. A second welding gun adjusting rod is slidably disposed in the second welding gun hole, and the second welding gun is mounted on the second welding gun adjusting rod. A second locking screw is threaded onto the inner welding ring, and the second locking screw passes into the second welding gun hole and abuts against the second welding gun adjusting rod.

3. The double-weld-seam welding forming device for building pipelines according to claim 1, characterized in that, The system also includes a base, with the fixed base fixed to the base. A first cylinder is horizontally mounted on the base, and the telescopic shaft of the first cylinder is connected to a movable base. The fixed base has a first bearing hole, in which a first bearing is fitted. A first hollow shaft is fitted to the inner ring of the first bearing. A first three-jaw chuck is coaxially mounted on the first hollow shaft, and a first external gear ring is fitted onto the first hollow shaft. A first drive window communicating with the first bearing hole is opened on the side wall of the fixed base, and a first transmission gear is rotatably arranged within the first drive window, meshing with the first external gear ring. The movable base has a second bearing hole, in which a second bearing is fitted. A second hollow shaft is fitted to the inner ring of the second bearing. The second three-jaw chuck is coaxially mounted on the second hollow shaft, and a second external gear ring is fitted on the second hollow shaft. The side wall of the movable base has a second drive window that connects to the second bearing hole. A second transmission gear is rotatably arranged in the second drive window and meshes with the second external gear ring. A drive box is provided on the base, and a drive shaft is rotatably arranged in the drive box. A long shaft gear is fitted on the drive shaft. The drive box has drive windows at positions corresponding to the first and second transmission gears. Both the first and second transmission gears mesh with the long shaft gear. A second motor is installed at one end of the drive box, and the output shaft of the second motor is connected to the drive shaft. A notch is provided on the outer welded ring for the drive box to pass through.

4. The double-weld-seam welding forming device for building pipelines according to claim 3, characterized in that, A second cylinder is horizontally mounted on the base. The telescopic shaft of the second cylinder is connected to the welding machine base. The inner welding ring is connected to the welding machine base through multiple adjustable rods. The side wall of the outer welding ring is connected to the telescopic shaft of the third cylinder. The cylinder body of the third cylinder is mounted on the base and is perpendicular to the second cylinder.

5. A method for forming a double-weld seam of a building pipeline, utilizing the double-weld seam welding apparatus for building pipelines as described in claim 1, characterized in that, Includes the following steps: S1. First, install one of the pipe fittings on the first three-jaw chuck, and install the forming disc on the second three-jaw chuck. Then, process the reinforcing groove on the welding end face of the pipe by friction. S2. Remove the forming plate and place the other pipe fitting on the second and third jaw chucks; S3. Move the movable base to make the welding end faces of the two pipes contact to form an annular weld, and adjust the position of the two pipes so that the annular weld is located directly below the first welding gun. S4. The welding machine base moves the inner welding ring, causing the inner welding ring to pass into the pipe and the second welding gun to correspond to the annular weld of the pipe. S5. The first welding torch always welds the outer top position of the annular weld, while the second welding torch always welds the inner top position of the annular weld. By rotating the second three-jaw chuck and the first three-jaw chuck, the two pipes rotate synchronously to form two annular welds on the pipes. S6. Under the action of the reinforcement tank and with the gravity of the welding liquid itself, the welding liquid can flow downward. The welding liquid flows into the reinforcement tank and can form several linear welding strips on the welding end faces of the two pipes. The linear welding strips connect the two circumferential welds to form welding reinforcement ribs. S7. Remove the welded pipe and repeat steps S1-S6 above to weld the next pipe.

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