Automatic production device for seamless parallel small guide pipes of welded pipes

Abstract

The invention relates to the technical field of guide pipe seamless welding clamping structures, in particular to a welded pipe seamless parallel small guide pipe automatic production device which comprises a support, a mold pressing device, a welding device, an edge removing device and a laser drilling device, and the mold pressing device, the welding device, the edge removing device and the laser drilling device are sequentially arranged on the support in the moving direction of a steel coil. A molding positioning part is arranged between the mold pressing device and the welding device; the molding positioning part comprises a reduction outer pipe arranged on the support, a reduction inner pipe is arranged at the concentric position in the reduction outer pipe, and a reduction tank is formed between the reduction outer pipe and the reduction inner pipe; starting from three core links of welding pre-shaping, flaw correction and welding seam optimization, various pain points such as welding seam bulging and edge warping, easy clamping and damage of a steel coil, welding seam deviation and insufficient welding rigidity in traditional small guide pipe production are progressively solved layer by layer; accurate positioning, efficient recovery, centering correction and weld joint strengthening of the steel coil are achieved.

Description

Technical Field

[0001] This invention relates to the field of seamless welding clamping structure technology for conduits, and more specifically, to an automatic production device for seamless parallel small conduits for welded pipes. Background Technology

[0002] A search revealed a welding method and apparatus for seamless steel pipes disclosed in publication number CN113146138A, relating to the field of seamless steel pipe welding technology. The apparatus includes a welding platform, a steel pipe storage box, a welding machine, a lifting and clamping assembly, and a finished product placement box. Two steel pipe storage boxes are fixedly installed on either side of the top of the welding platform, with a reinforcing rod welded between them. The welding machine is fixedly installed at the bottom of the reinforcing rod. A steel pipe transposition groove is provided on the top side of the welding platform. Steel pipe transmission mechanisms are fixedly installed on the top side of the transposition groove and at the bottom of the steel pipe storage box. A steel pipe fixing mechanism is also fixedly installed on the top of the transposition groove. A first motor is fixedly installed at the bottom of the welding platform, and a lead screw is installed on the output shaft of the first motor. This invention enables accurate and rapid welding of seamless steel pipes, with a high degree of automation, requiring minimal manual operation. It also offers diverse functions, including grinding, painting, and marking of the weld seam, resulting in a less noticeable weld seam, improved aesthetics, and high economic value.

[0003] In existing conduit manufacturing and welding processes, steel coils must first be straightened, then progressively extruded and positioned through multiple molding units, causing both sides to gradually bend inwards, ultimately forming a cylindrical steel pipe for welding, which is the conduit described in this invention. However, the following technical bottlenecks exist in this rolling process: First, due to the spacing between each molding unit and the gradient change in pressure across different sections, bulges or warping defects are prone to occur at the joints of the steel coils before they are fully closed into steel pipes. These defects not only directly lead to the failure of subsequent welding processes but may also damage the welding equipment due to interference from the protrusions.

[0004] Secondly, although some existing equipment is equipped with reset mechanisms for bulges and warping, effective buffer structures are generally lacking. This makes steel coils with deformation defects prone to feeding obstruction or even jamming during transport, affecting production continuity.

[0005] Finally, when the molded steel coils arrive at the welding station, the extremely narrow butt joint, coupled with the need for immediate edge scraping (trimming) after welding to remove excess weld material and ensure the roundness of the pipe, often results in insufficient filler metal in the weld area. This directly weakens the weld strength, leading to poor weld quality and making it difficult to meet the performance requirements of seamless steel pipes.

[0006] Based on this, the present invention discloses an automatic production device for seamless parallel small guide tubes of welded pipes. Summary of the Invention

[0007] To address the problems in the welding process of conduit production mentioned in the background art, where the steel coil is gradually rolled into shape by straightening and multiple sets of molding units, bulges or warping are easily generated at the joint due to the molding spacing and pressure gradient. This not only leads to welding failure and equipment damage, but also causes feeding jams due to the lack of a buffer structure in the reset mechanism. In addition, the welding station gap is too narrow and the post-weld scraping treatment results in insufficient filler metal in the weld, ultimately resulting in low weld strength and poor quality, which makes it difficult to meet the performance requirements of seamless steel pipes. The present invention provides an automatic production device for seamless parallel small conduits, which includes a support and a molding device, a welding device, an edge trimming device and a laser drilling device arranged sequentially on the support along the movement direction of the steel coil. A molding positioning part is provided between the molding device and the welding device. Because the clamping structure in the traditional conduit production welding process cannot cope with the bulging or curling of the conduit weld seam during the rolling process, the present invention uses the steel coil that is about to be rolled into a quick forming stage to re-extrude in order to eliminate the bulging or curling, while also playing a clamping and fixing role, which facilitates subsequent seamless welding. As a further improvement to this technical solution, the molding and positioning part includes a reduction outer tube mounted on a support, a reduction inner tube concentrically positioned inside the reduction outer tube, and a reduction groove formed between the reduction outer tube and the reduction inner tube; the molding and positioning part also includes a positioning tube fixedly connected to the front end of the reduction outer tube, the positioning tube and the reduction outer tube being concentrically positioned, and a tapered opening being provided at the center of the front end of the positioning tube, the end of the tapered opening being adapted to the outer ring of the reduction groove.

[0008] Based on this, since the bulges vary in size, smaller warped edges and bulges require stronger compression to recover. Even so, without additional pressure, it is impossible to achieve a relatively complete recovery of the bulges and warped edges. Therefore, this invention uses an additional extrusion structure within the reduction tank to recover the bulges and warped edges at the weld seam of the steel coil, that is, by reducing the gap in the reduction tank. However, reducing the gap is not conducive to the passage of the steel coil and is prone to jamming, causing production to stop. Therefore, this invention adopts an elastic design for the extrusion structure to have a buffering effect, preventing the extrusion structure from obstructing the bulges and warped edges and causing the steel coil to break, allowing it to enter the recovery process smoothly. Secondly, a safety mechanism is added so that bulges and warped edges that cannot be completely recovered can pass directly, preventing jamming due to inability to pass. As a further improvement to this technical solution, symmetrical receiving grooves are provided on both sides of the top end of the outer tube for reduction, a reduction component is slidably arranged in the receiving groove, and an anti-jamming component is slidably connected to the reduction component in the receiving groove. Among them, the restoration component includes an extrusion block, and a number of limiting rods are symmetrically arranged on both sides of the extrusion block. Limiting grooves corresponding to the limiting rods are opened on both sides of the accommodating groove in the restoration outer tube. The extrusion block is slidably connected in the limiting grooves through the limiting rods, and the bottom of the extrusion block is located in the restoration groove; the bottom of the extrusion block located in the restoration groove is divided into a feeding area and a restoration area, and a buffer roller is arranged at the front end of the feeding area.

[0009] In order to enable the extrusion block to play an enhanced extrusion restoration effect and a buffering effect after the problem steel coil enters, it is necessary to cooperate with the anti-jamming component to have a rearward buffering structure. At the same time, when the steel coil has serious bulges and cannot be forcibly restored to prevent jamming, it needs to be lifted and avoided, and has an insurance mechanism. Specifically, first, the limiting groove is designed to be in a shape of a Chinese character 'hui' (i.e., a hui-shaped groove structure); As a further improvement of the technical solution, a protrusion is arranged in the inner bottom section of the hui-shaped groove of the limiting groove, and the protrusion divides the inner bottom section of the hui-shaped groove of the limiting groove into a buffering section and a positioning section; secondly, the anti-jamming component includes a telescopic cylinder, and two springs with increasing elasticity are sequentially arranged in the telescopic cylinder.

[0010] In another solution, first, for the steel coil after the bulging and edge-warping restoration processes, there may be a problem that the weld seam is not centered. Even for steel coils without bulges and edge-warping, there are also likely to be slight weld seam non-centering problems in the coiling process. Therefore, in this invention, a correction process is added at the back end of the restoration process to ensure that the weld seam is centered; then the steel coil is further shaped to make it reach the specified cylindrical structure, and at the same time, the edge-warping and bulging problems not solved in the restoration process are compensated, so that it meets the welding requirements when reaching the welding position, and has multiple effects of restoration, correction, clamping, and positioning on the steel pipe to be welded, and a slight pressing measure is taken on the weld seam position to produce a certain concave effect at the weld seam position. Considering that the steel coil has toughness, this concave effect is extremely small, but this small effect can increase the metal welding material at the weld seam position, and then through the scraping of the edge-trimming device in the subsequent process, the weld seam can meet the requirement of seamless welding while increasing the welding effect of the weld seam; As a further improvement of the technical solution, the shaping and positioning part further includes a shaping pipe fixedly connected to the end of the restoration outer tube and concentric with the restoration outer tube. The shaping pipe is sequentially divided into a correction area and an inward buckling area along the steel coil entering direction. The correction area is in a conical structure, and the end of the correction area is smoothly connected to the inward buckling area, and the inward buckling area is adapted to the outer diameter of the conduit; and a correction plate is fixedly arranged at the center position of the top of the correction area, and an inward buckling component is fixedly arranged at the center position of the top of the inward buckling area.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. In this automatic production device for seamless parallel small ducts of welded pipes, by setting a restoration extrusion structure with elastic buffering and an insurance mechanism, the smooth restoration of the problem steel coil and anti-jamming protection are achieved; The device is equipped with an anti-jamming assembly in the reduction tank, which includes an extrusion block, a buffer roller, and a double-section elastic spring. When a steel coil with bulges or warped edges enters, it is first subjected to flexible pre-compression and initial restoration by the buffer roller and the first-section buffer spring. If a severe bulge causes excessive resistance, the strong spring is compressed, pushing the extrusion block to move upward along the U-shaped limiting groove to avoid it, allowing the steel coil to pass through without jamming or tearing. This not only effectively eliminates deformation defects at the weld, but also avoids equipment jamming and production interruption caused by hard extrusion.

[0012] 2. In this automatic production device for seamless parallel small guide pipes, the automatic centering and correction of the weld seam and precise dimensional shaping are achieved by setting a conical correction zone in conjunction with a positioning plate. After the restoration process, the steel coil enters the correction zone composed of a conical structure and a central positioning plate. Utilizing a conical guide surface that is wider at the front and narrower at the back, the steel coil can be gradually guided to the centerline during its forward movement, regardless of how the initial weld seam position is offset, and the position is locked by the rectangular positioning plate at the end. This structure compensates for the defect of easy weld seam eccentricity in traditional coiling processes, ensuring the centering during subsequent welding. At the same time, the conical shrinkage process also performs a secondary simple restoration of the steel coil, further ensuring the cylindricity accuracy of the guide pipe.

[0013] 3. In this automatic production device for seamless parallel small conduits, an inner-coiling component with a concave function is used to increase the metal filling amount at the weld, thereby improving the rigidity and quality of the seamless weld. After the steel coil reaches the specified diameter, trapezoidal inner-coiling plates symmetrically arranged within the inner-coiling area apply slight pressure to both sides of the weld, causing a slight concave deformation at the weld position. Utilizing the toughness of the steel, this concavity forms additional filling space during welding, increasing the accumulation of molten metal. Combined with subsequent edge trimming and scraping processes, this ensures a smooth and seamless outer surface of the conduit and overcomes the problems of insufficient weld metal and inadequate weld rigidity caused by edge trimming in traditional processes, thus significantly improving the welding strength and durability of the final product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the molding and positioning part of the present invention; Figure 3 This is a cross-sectional view of the molding and positioning part of the present invention; Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a front cross-sectional view of the molding and positioning part of the present invention; Figure 6 This is a schematic diagram of the limiting groove of the present invention; Figure 7This is a schematic diagram of the structure of the correction plate of the present invention; Figure 8 This is a schematic diagram of the internal buckle assembly of the present invention; Figure 9 for Figure 8 Enlarged view of the structure at point B; Figure 10 This is a cross-sectional view of the structure of the reducing outer tube of the present invention; Figure 11 This is a schematic diagram of the anti-jamming assembly of the present invention; Figure 12 This is a cross-sectional view of the anti-jamming assembly of the present invention; Figure 13 This is a schematic diagram of the extrusion block of the present invention; Figure 14 This is a cross-sectional view of the extrusion block of the present invention.

[0015] The meanings of the labels in the diagram are as follows: 1. Support; 2. Molding device; 3. Welding device; 4. Positioning tube; 5. Outer tube for restoration; 6. Inner tube for restoration; 7. Receiving groove; 8. Restoration assembly; 9. Anti-jamming assembly; 10. Molding tube; 11. Correction area; 12. Inner buckling area; 13. Correction plate; 14. Inner buckling assembly; 15. Restoration groove; 16. Connecting plate; 17. Limiting groove; 18. Edge trimming device; 19. Laser drilling device; 20. Conical opening; 81. Extrusion block; 82. First elastic telescopic rod; 83. Buffer roller; 84. Feeding area; 85. Reduction area; 86. First roller; 87. Limiting rod; 88. Slide groove; 89. Second elastic telescopic rod; 91. Telescopic box; 92. Fixed box; 93. Slide board; 94. Buffer spring; 95. High-strength spring; 131. Conical straightening plate; 132. Positioning plate; 141. Conical inner buckle plate; 142. Second roller; 171. Buffer section; 172. Protrusion; 173. Positioning section; 174. Reset section. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the existing welding process for conduit production, when steel coils are gradually rolled into shape through straightening and multiple sets of molding units, bulges or warping are easily generated at the joint due to the molding spacing and pressure gradient. This not only leads to welding failure and equipment damage, but also causes feeding jams due to the lack of a buffer structure in the reset mechanism. In addition, the welding station gap is too narrow and the post-weld scraping treatment results in insufficient filler metal in the weld, ultimately resulting in low weld strength and poor quality, which makes it difficult to meet the performance requirements of seamless steel pipes.

[0018] Therefore, this invention provides an automated production device for seamless parallel small guide pipes for welded pipes. See [link to device]. Figure 1 As shown, it includes a support 1 and a molding device 2, a welding device 3, a trimming device 18 and a laser drilling device 19 arranged sequentially on the support 1 along the moving direction of the steel coil. A molding positioning part is provided between the molding device 2 and the welding device 3.

[0019] For details, see Figure 2 , Figure 5 and Figure 10 As shown, in the traditional catheter manufacturing welding process, the clamping structure during the welding stage cannot cope with the bulging or curling of the catheter weld seam during the rolling process. Therefore, this invention uses the steel coil that is about to be rolled into a quick-forming stage to re-extrude it to eliminate the bulging or curling, while also clamping and fixing it to facilitate subsequent seamless welding. Specifically, the molding and positioning part includes a reduction outer tube 5 set on the support 1, a reduction inner tube 6 set concentrically inside the reduction outer tube 5, and a reduction groove 15 formed between the reduction outer tube 5 and the reduction inner tube 6. The molding and positioning part also includes a positioning tube 4 fixedly connected to the front end of the reduction outer tube 5. The positioning tube 4 and the reduction outer tube 5 are concentrically set, and a tapered opening 20 is opened at the center of the front end of the positioning tube 4. The end of the tapered opening 20 is adapted to the outer ring of the reduction groove 15.

[0020] During operation, the steel coil, which is about to be rolled into shape, is already close to cylindrical. Therefore, bulges or warped edges often occur at weld seams. Using the push force of the production line, the steel coil first enters the conical opening 20 of the positioning tube 4. Because the conical opening 20 has a conical structure, it facilitates the feeding of the problematic steel coil into the subsequent restoration process. Then, the steel coil smoothly enters the restoration tank 15 formed by the outer restoration tube 5 and the inner restoration tube 6. Figure 4 It can be seen that the inner tube 6 is connected to the top center of the outer tube 5 through the connecting plate 16. Since the reduction tank 15 is slightly larger than the thickness of the steel coil, the steel coil will enter the reduction tank 15 for subsequent restoration work after being guided by the conical opening 20. In this way, the steel coil will pass through the connecting plate 16 through the weld, and the remaining parts will be compressed and restored by the upper and lower walls of the reduction tank 15.

[0021] Further, see Figures 3-5 and Figures 10-14 As shown, due to the varying sizes of bulges, smaller warped edges and bulges require stronger compression to recover. Even so, without additional pressure, it is impossible to achieve a relatively complete recovery of bulges and warped edges. Therefore, this invention employs an additional extrusion structure within the reduction tank 15 to recover bulges and warped edges at the weld seam of the steel coil, i.e., by reducing the gap in the reduction tank 15. However, reducing the gap is not conducive to the passage of the steel coil and can easily lead to jamming, causing production to be unable to continue. Consequently, this invention adopts an elastic design for the extrusion structure, giving it a buffering effect to prevent the extrusion structure from obstructing the bulges and warped edges and causing the steel coil to break, allowing it to smoothly enter the recovery process. Secondly, a safety mechanism is added to allow bulges and warped edges that cannot be completely recovered to pass directly, preventing jamming due to inability to pass. Specifically, the outer tube 5 has symmetrically provided receiving grooves 7 on both sides of the inner top end, the receiving groove 7 has a slidingly provided receiving component 8, and the receiving groove 7 has an anti-jamming component 9 that is slidably connected to the reducing component 8. The reduction assembly 8 includes a compression block 81, with several limiting rods 87 symmetrically arranged on both sides of the compression block 81. Limiting grooves 17, corresponding to the limiting rods 87, are formed on both sides of the receiving groove 7 inside the reduction outer tube 5. The compression block 81 is slidably connected to the limiting grooves 17 via the limiting rods 87, and the bottom of the compression block 81 is located within the reduction groove 15. Next, the reduction assembly 8 also includes a first elastic telescopic rod 82. The top of the first elastic telescopic rod 82 is fixed within the receiving groove 7, and the bottom of the first elastic telescopic rod 82 is slidably connected to the top of the compression block 81. The bottom of the compression block 81 within the reduction groove 15 is divided into an infeed area 84 and a reduction area. In zone 85, a buffer roller 83 is provided at the front end of the feeding zone 84. A groove 88 is provided in the extrusion block 81. A second elastic telescopic rod 89 is provided on both sides of the groove 88. The telescopic ends of the second elastic telescopic rod 89 are rotatably connected to the buffer roller 83. The buffer roller 83 is slidably disposed in the groove 88, and the bottom of the buffer roller 83 extends to the outside of the bottom of the extrusion block 81. In the feeding zone 84, a number of first rollers 86 are arranged in a matrix at the rear end of the buffer roller 83. The first rollers 86 are flush with the bottom of the extrusion block 81. The reduction zone 85 is a smooth zone, and the bottom of the extrusion block 81 has an overall arc-shaped structure and is concentrically arranged with the reduction tank 15.

[0022] To ensure that the extrusion block 81 effectively enhances the extrusion recovery and provides a buffering effect after the problematic steel coil enters, it needs to be paired with the anti-jamming component 9, which features a rearward buffering structure. Furthermore, when the steel coil bulges severely and cannot be forcibly recovered to prevent jamming, it needs to be lifted to avoid obstruction, thus providing a safety mechanism. Specifically, the limiting groove 17 is designed in a U-shape, i.e., a U-shaped groove structure. A protrusion 172 is provided in the bottom section of the U-shaped groove 17, dividing the bottom section into a buffer section 171 and a positioning section 173. The buffer section 171 has a notch at the top. The side sections and the top section of the U-shaped groove 17 are reset sections 174, limiting... The groove 17 is a U-shaped groove that matches the outer diameter of the limiting rod 87; secondly, the anti-jamming assembly 9 includes a telescopic cylinder, in which two springs with increasing elasticity are sequentially arranged. The telescopic cylinder of the anti-jamming assembly 9 includes a fixed box 92 fixed in the receiving groove 7. A telescopic box 91 is slidably connected in the fixed box 92. The front end of the telescopic box 91 is slidably connected to the end of the pressing block 81. A sliding plate 93 is slidably connected in the fixed box 92. A buffer spring 94 is arranged in the telescopic box 91. A strong spring 95 is arranged in the fixed box 92. The end of the buffer spring 94 and the front end of the strong spring 95 are respectively fixedly connected to both sides of the sliding plate 93. The elasticity of the buffer spring 94 is less than that of the strong spring 95. It should be added that before the limit rod 87 passes over the protrusion 172, the elastic force of the strong spring 95 is sufficient to keep the slide plate 93 stationary.

[0023] It should be noted that the molding and positioning part in this invention can pass smoothly for normal steel coils; this invention only explains how problematic steel coils can pass through and be restored and corrected. During operation, after the steel coil is guided into the reduction tank 15 through the conical opening 20, it first contacts the buffer roller 83. The buffer roller 83 serves to smoothly guide the problematic steel coil into the feeding area 84 and to buffer the problem steel coil from direct hard contact with the extrusion block 81 due to bulges and warped edges, thus preventing bulges or warped edges from tearing. Moreover, the bottom of the buffer roller 83 is slightly higher than the bottom of the extrusion block 81, so it also has a pre-compression effect. In other words, after the problematic steel coil encounters the buffer roller 83, it is guided by the cylindrical structure to facilitate its entry into the feeding area 84. At the same time, the buffer roller 83 is slidably connected to the chute 88 through the second elastic telescopic rod 89. Therefore, the buffer roller 83 can generate elastic buffering along the radial direction of the reduction tank 15 and has the ability to rotate, making the entry of the problematic steel coil more stable and preventing hard contact between the problematic steel coil and the extrusion block 81. It can also pre-treat bulges or warped edges.

[0024] Both the second elastic telescopic rod 89 and the first elastic telescopic rod 82 here have a built-in spring structure in the telescopic cylinder, which gives them elastic self-recovery, that is, the telescopic end is elastic. Because the structure is matured first, the structure has not been developed. When the problematic steel coil enters the feeding zone 84, it continues to move forward as the production line runs. Due to the presence of bulges and warped edges, the friction during its forward movement is enormous. Therefore, the matrix-arranged first rollers 86 within the feeding zone 84 ensure that the problematic steel coil is smoothly guided and gently restored as it passes through the feeding zone 84. After passing through the feeding zone 84, most of the restoration work has been completed. Then, the restoration zone 85 provides comprehensive restoration and compaction. Specifically, the restoration zone 85, together with the problematic steel coil and the inner restoration tube 6, forms a stronger compressive force, achieving the desired restoration effect for the problematic steel coil.

[0025] In particular, the buffering effect of the problematic steel coil entering the buffering stage relies not only on the elastic extension and rotation of the buffer roller 83, but also on the linkage of the telescopic box 91 with the buffer spring 94, and the limiting rod 87 within the buffer section 171 to further achieve the buffering effect; specifically, as Figure 6 It can be seen that in the initial state, the extrusion block 81 is in a position controlled by the limiting rod 87. Figure 6 In the middle state, that is, within the buffer section 171, with a notch at the top, the limiting rod 87 is initially limited at both ends. When the problematic steel coil enters and impacts the buffer roller 83, the extrusion block 81 will be displaced backward through the limiting rod 87, thereby compressing the buffer spring 94 inside the telescopic box 91. This causes the spring inside the anti-jamming assembly 9 to undergo the first stage of compression, i.e., buffer compression. The buffer compression is achieved through the buffer spring 94, thus achieving a further buffering effect. The design of the protrusion 172 here serves two purposes: first, to fully utilize the buffering effect of the buffer spring 94, i.e., when the limiting rod 87 moves backward within the buffer section 171, only the buffer spring 94 is compressed; second, to provide a support point for the first layer of buffering in the buffer roller 83 stage. That is, when the limiting rod 87 reaches the position of the protrusion 172, the presence of the protrusion 172 will cause the limiting rod 87 to pause, thereby providing a support point for the radial displacement buffering of the buffer roller 83, making the double buffering effect more significant. The protrusion 172 is extremely small. Therefore, when the bulging problem is severe, and the buffer roller 83 and buffer spring 94 cannot buffer the problematic steel coil to enter the reduction tank 15 smoothly, the steel coil will push the extrusion block 81 to continue moving backward after buffering. At this time, the limit rod 87 will pass over the protrusion 172 and enter the positioning section 173. At this time, the strong spring 95 will compress. If the bulging problem is reduced during this stage of compression, the steel coil will smoothly enter the feeding area 84 and then be restored and compacted. The limit rod 87 will be bounced back to its original position by the buffer spring 94 and the strong spring 95 because the steel coil has entered smoothly. If the problem is not reduced, the pushing will continue. As the pressing block 81 moves backward until the limiting rod 87 reaches the reset section 174, the telescopic box 91 will continue to compress into the fixed box 92. That is, the sliding plate 93 will start to compress the strong spring 95, and the limiting rod 87 will move upward along the arrow. That is, the bulge pushes the pressing block 81 upward, and then the bulge passes over the pressing block 81, so that it can enter the subsequent process. The subsequent process will correct the problem and prevent jamming. After the pressing block 81 is pushed upward by the bulge, due to the presence of the buffer spring 94 and the strong spring 95, the limiting rod 87 will be pushed to the front position of the reset section 174 along the arrow. Then, it will be moved down to the initial position by the first elastic telescopic rod 82. It should be noted that when the limiting rod 87 is located within the buffer section 171 and the positioning section 173, the intermediate plate in the limiting groove 17 can always provide radial support for the extrusion block 81, ensuring that the bottom of the extrusion block 81 can reset and compact the steel coil; that is, the problematic steel coil completes the restoration process by passing over the buffer roller 83, the feeding area 84 and the restoration area 85 at this stage.

[0026] Furthermore, see Figure 3 , Figure 5 and Figures 7-9 As shown, after the steel coil undergoes the bulging and warping restoration process, there may be issues with the weld seam not being centered. Even steel coils without bulging and warping are prone to minor weld seam misalignment during the coiling process. Therefore, this invention employs a straightening process added after the restoration process to ensure the weld seam is centered. Subsequently, the steel coil is further shaped to achieve the specified cylindrical structure, while compensating for the warping and bulging issues that were not resolved in the restoration process. This ensures that the coil meets the welding requirements when it reaches the welding position, achieving multiple effects of restoration, straightening, clamping, and positioning for the steel pipe to be welded. Furthermore, a slight downward pressure is applied to the weld seam position to create a certain concave effect. Due to the toughness of the steel coil, this concave effect is extremely small, but this small effect can increase the amount of metal welding material at the weld seam position. After the subsequent edge scraping by the edge trimming device 18, the weld seam can achieve the requirements of seamless welding while improving the welding effect. Specifically, the molding and positioning part also includes a molding tube 10 fixedly connected to the end of the outer tube 5 and concentric with the outer tube 5. The molding tube 10 is divided into a straightening zone 11 and an inner buckling zone 12 along the direction of the steel coil entry. The straightening zone 11 has a conical structure, and the end of the straightening zone 11 is smoothly connected to the inner buckling zone 12. The inner buckling zone 12 is adapted to the outer diameter of the guide tube. A straightening plate 13 is fixedly provided at the top center of the straightening zone 11, and an inner buckling component 14 is fixedly provided at the top center of the inner buckling zone 12. The straightening plate 13 includes a positioning plate 132, with conical straightening plates 131 symmetrically fixed at both ends of the positioning plate 132. The conical straightening plates 131 are conical, and the positioning plate 132 is rectangular. The inner buckling assembly 14 includes conical inner buckling plates 141 fixed on both sides of the top center line of the inner buckling area 12. The conical inner buckling plates 141 have a trapezoidal structure, and the bottom of the end of the conical inner buckling plates 141 has a smooth structure. A second roller 142 is rotatably arranged inside the bottom of the end of the conical inner buckling plates 141.

[0027] During work, through Figure 5 As can be seen, the straightening zone 11 has a conical structure. Therefore, as long as the steel coil enters this stage, it can proceed regardless of whether the problem steel coil has been resolved, because the straightening zone 11 has a design that is larger at the front and smaller at the back. This stage serves two purposes: firstly, the presence of the straightening plate 13 centers and corrects the weld seam; secondly, if the problem steel coil triggers the safety mechanism of the strong spring 95 and the reset section 174, causing the problem steel coil to pass through the feeding zone 84 and the restoration zone 85 without being properly compressed, then the compression and restoration process of the problem steel coil is compensated for. That is, through the conical structure, the problem steel coil is gradually compressed and restored. The coil is easily restored, reducing the risk of scratching the welding equipment and making welding impossible. The tapered straightening plate 131 is narrow at the front and wide at the back. Therefore, if there is a slight deviation when the weld passes through the tapered straightening plate 131, it will gradually be centered under the guidance of the tapered straightening plate 131, and then the positioning plate 132 will finally position and ensure the centering of the weld. After the steel coil continues to move forward, the symmetrically arranged tapered straightening plates 131 are wide at the front and narrow at the back, so that the weld of the steel coil gradually narrows and gradually meets the requirements of the final guide diameter. Secondly, due to the limited amount of metal filling the weld seam during traditional welding, coupled with the subsequent scraping of the weld seam edges, the weld seam lacks welding rigidity in order to achieve seamlessness. Therefore, in this invention, after the steel pipe enters the inner buckling zone 12, the steel pipe already meets the diameter requirements of the final conduit. Thus, through the design of the tapered inner buckling plate 141, the steel coils at both ends of the weld seam will gradually develop a slight concavity. In addition, due to the toughness of the steel coil, when the steel coil passes through the inner buckling zone 12 and is welded to the welding device 3, a slight concave space will be added. This does not affect the overall regular shape of the final conduit, and at the same time, the concave design increases the amount of welding metal, thereby improving the welding effect.

[0028] In summary, through the synergistic effect of three core mechanisms—elastic recovery anti-jamming, conical guidance self-centering, and micro-concave additive welding—and by optimizing the clamping structure to solve the above problems, it can not only meet the clamping function of the steel pipe during the welding process, but also simultaneously solve the problems of difficult weld deformation, inaccurate positioning, and low welding strength in the traditional small conduit production welding.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic production device for seamless parallel small guide tubes of welded pipes, comprising a support (1) and a molding device (2), a welding device (3), an edge-trimming device (18), and a laser drilling device (19) sequentially arranged on the support (1) along the moving direction of the steel coil, characterized in that: A molding positioning part is provided between the molding device (2) and the welding device (3), which includes a reduction outer tube (5) on the support (1). Among them, a reduction inner tube (6) is concentrically arranged inside the reduction outer tube (5), and a reduction groove (15) is formed between the reduction outer tube (5) and the reduction inner tube (6); a receiving groove (7) is symmetrically opened on both sides of the top end of the reduction outer tube (5), a reduction component (8) is slidably arranged in the receiving groove (7), and an anti-jamming component (9) is slidably connected to the reduction component (8) in the receiving groove (7). The reduction assembly (8) includes a compression block (81). Several limiting rods (87) are symmetrically arranged on both sides of the compression block (81). The reduction outer tube (5) has limiting grooves (17) corresponding to the limiting rods (87) on both sides of the receiving groove (7). The compression block (81) is slidably connected to the limiting groove (17) through the limiting rods (87). The limiting groove (17) is in the shape of a U-shape. The bottom of the compression block (81) is located in the reduction groove (15). The anti-jamming assembly (9) includes a telescopic cylinder, inside which are arranged two springs with increasing elasticity.

2. The automatic production device for seamless parallel small guide pipes according to claim 1, characterized in that: The molding positioning part also includes a positioning tube (4) that is fixedly connected to the front end of the reduction outer tube (5). The positioning tube (4) and the reduction outer tube (5) are arranged concentrically, and a tapered opening (20) is opened at the center of the front end of the positioning tube (4). The end of the tapered opening (20) is adapted to the outer ring of the reduction groove (15).

3. The automatic production device for seamless parallel small guide pipes according to claim 1, characterized in that: The reduction groove (15) is larger than the thickness of the steel coil. The reduction assembly (8) also includes a first elastic telescopic rod (82). The top of the first elastic telescopic rod (82) is fixed in the receiving groove (7). The bottom of the first elastic telescopic rod (82) is slidably connected to the top of the extrusion block (81). The bottom of the extrusion block (81) located in the reduction groove (15) is divided into a feeding area (84) and a reduction area (85). A buffer roller (83) is provided at the front end of the feeding area (84). A sliding groove (88) is provided in the extrusion block (81). A second elastic telescopic rod (89) is provided on both sides of the sliding groove (88). The telescopic end of the second elastic telescopic rod (89) is rotatably connected to the buffer roller (83). The buffer roller (83) is slidably disposed in the sliding groove (88), and the bottom of the buffer roller (83) extends to the outside of the bottom of the extrusion block (81).

4. The automatic production device for seamless parallel small guide pipes according to claim 3, characterized in that: The feeding area (84) is provided with a number of first rollers (86) arranged in a matrix at the rear end of the buffer roller (83). The first rollers (86) are flush with the bottom of the extrusion block (81). The reduction zone (85) is a smooth zone, and the bottom of the extrusion block (81) is an arc-shaped structure and is concentrically arranged with the reduction groove (15).

5. The automatic production device for seamless parallel small guide pipes according to claim 1, characterized in that: The bottom section of the groove (17) is provided with a protrusion (172). The protrusion (172) divides the bottom section of the groove (17) into a buffer section (171) and a positioning section (173). The top of the buffer section (171) is provided with a notch. The two sides and the top section of the groove (17) are reset sections (174). The groove (17) is adapted to the outer diameter of the limiting rod (87).

6. The automatic production device for seamless parallel small guide pipes according to claim 5, characterized in that: The telescopic cylinder of the anti-jamming assembly (9) includes a fixed box (92) fixed in the receiving groove (7), a telescopic box (91) slidably connected in the fixed box (92), the front end of the telescopic box (91) slidably connected to the end of the extrusion block (81), a sliding plate (93) slidably connected in the fixed box (92), a buffer spring (94) provided in the telescopic box (91), a strong spring (95) provided in the fixed box (92), the end of the buffer spring (94) and the front end of the strong spring (95) are respectively fixedly connected to both sides of the sliding plate (93), and the elastic force of the buffer spring (94) is less than that of the strong spring (95).

7. The automatic production device for seamless parallel small guide pipes according to claim 6, characterized in that: Before the limiting rod (87) passes over the protrusion (172), the elastic force of the strong spring (95) satisfies the condition that the slide plate (93) remains stationary.

8. The automatic production device for seamless parallel small guide pipes according to claim 1, characterized in that: The molding and positioning part also includes a molding tube (10) fixedly connected to the end of the reduction outer tube (5) and concentric with the reduction outer tube (5). The molding tube (10) is divided into a correction area (11) and an inner buckling area (12) in sequence along the steel coil entry direction. The correction area (11) has a conical structure. The end of the correction area (11) is smoothly connected to the inner buckling area (12), and the inner buckling area (12) is adapted to the outer diameter of the conduit. The correction plate (13) is fixed at the top center of the correction area (11), and the inner fastening component (14) is fixed at the top center of the inner fastening area (12).

9. The automatic production device for seamless parallel small guide pipes according to claim 8, characterized in that: The correction plate (13) includes a positioning plate (132), and a conical correction plate (131) is symmetrically fixedly connected to the front and rear ends of the positioning plate (132). The conical correction plate (131) is conical, and the positioning plate (132) is rectangular.

10. The automatic production device for seamless parallel small guide pipes according to claim 9, characterized in that: The inner buckle assembly (14) includes a conical inner buckle plate (141) fixed on both sides of the top center line of the inner buckle area (12). The conical inner buckle plate (141) has a trapezoidal structure and a smooth bottom at the end of the conical inner buckle plate (141). A second roller (142) is rotatably provided at the bottom of the end of the conical inner buckle plate (141).

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