Pressure pipeline welding tool

Abstract

The invention belongs to the field of pressure pipeline machining technical equipment, and particularly relates to a pressure pipeline welding tool which comprises two sets of welding tool bodies arranged in a mirroring mode, each welding tool body comprises a base, a carrier roller frame is arranged above the base, a vertical lifting mechanism is arranged on one side of a vertical frame, and a clamping mechanism is arranged on the other side of the vertical frame. A clamping and positioning tool is arranged on one side of the vertical lifting mechanism, a three-axis moving mechanism is arranged on the upper portion of the other side of the vertical frame, and a surrounding type welding mechanism is arranged at the output end of the lower portion of the three-axis moving mechanism. A limiting and cleaning mechanism integrating the clamping, limiting and cleaning functions is arranged on the outer side of the surrounding type welding mechanism located on the left side. Double-station surrounding type welding equipment is adopted for executing welding work of workpieces, the workpiece butt joint limiting function and the pre-welding and during-welding cleaning function are integrated, the stability and matching accuracy of the positions where the workpieces are located in the welding period are guaranteed, the workpiece welding forming quality is guaranteed, the work progress is improved, and the use requirement is met.

Description

Technical Field

[0001] This invention belongs to the field of pressure pipeline processing technology and equipment, and particularly relates to a pressure pipeline welding fixture. Background Technology

[0002] In industrial production, the welding quality of pressure pipelines directly affects the safety and reliability of fluid transport systems. Currently, welding technology in this field has mainly evolved from traditional manual operation to automated mechanical welding; however, both technological approaches have bottlenecks that restrict welding quality and production efficiency.

[0003] The drawbacks of traditional manual welding: In the past, welding of pressure pipelines relied entirely on manual labor by welders. This method involved extremely high labor intensity for operators, requiring them to maintain high concentration and precise posture for extended periods in harsh environments, easily leading to physical fatigue and low work efficiency. Furthermore, manual welding is slow, the stability of welding parameters is difficult to control precisely, and the weld quality is inconsistent, making it unsuitable for the demands of modern large-scale, high-efficiency, and high-quality production.

[0004] The shortcomings of existing automated welding: To overcome the drawbacks of manual welding, the industry has gradually adopted automated welding equipment equipped with robotic arms. While this method automates basic welding actions and improves some operational efficiency, it still has the following key drawbacks: Rotational damage: Due to the limited working range of welding robots, it is usually necessary to rotate the workpiece to be welded during the welding process to achieve full coverage of the circumferential weld seam of the pipeline. The mechanical stress or vibration generated by this rotation operation can easily damage the weld seam area that has been completed but has not yet fully cooled and solidified, such as causing microcracks, deformation or stress concentration, thereby directly impairing the final strength and sealing performance of the weld position.

[0005] Lack of alignment function: In pipe butt welding, the concentricity and end face alignment accuracy of the two workpieces to be connected are prerequisites for ensuring uniform weld formation and stress distribution. However, existing equipment lacks automatic alignment and clamping positioning mechanisms, relying mainly on operator visual inspection or simple tools for preliminary positioning, making it difficult to achieve precise docking between workpieces, thus increasing the risk of defects such as weld misalignment and incomplete fusion.

[0006] The pre-welding cleaning process is complex: the cleanliness of the workpiece's weldable area is crucial before welding. Oil, rust, oxide layers, and other impurities can cause welding defects such as porosity and slag inclusions at high temperatures. Existing automated welding fixtures generally require manual cleaning of the pipe connection weld joints before processing, lacking an online cleaning module during the process, which to some extent affects the weld quality and appearance.

[0007] Therefore, in view of the inefficiency and large quality fluctuations of the above-mentioned manual welding processing methods, and the fact that existing automation solutions can solve the efficiency problem, but still have problems such as poor workpiece docking accuracy and limited workpiece cleaning process, this paper provides a workpiece welding fixture that uses a dual-station surround welding equipment to perform workpiece welding work, and integrates workpiece docking limit and pre-welding cleaning functions to ensure the stability and accuracy of the workpiece position during the welding cycle, while cleaning the welding interface to a certain extent to ensure its cleanliness, guarantee the quality of workpiece welding formation, improve the work process, and effectively meet the pressure pipeline welding requirements. Summary of the Invention

[0008] This invention addresses the technical problems existing in the above-mentioned pipeline welding process by proposing a pressure pipeline welding fixture that is rationally designed, simple in structure, easy to process, and uses a dual-station surround welding device to perform the welding workpiece. It integrates workpiece docking limit and pre-welding cleaning functions to ensure the stability and accuracy of the workpiece's position during the welding cycle, while cleaning the welding interface to a certain extent to ensure its cleanliness, guarantee the quality of the workpiece welding, improve the work process, and effectively meet the usage requirements.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is a pressure pipeline welding fixture, comprising two sets of welding fixture bodies arranged in a mirror image. Each welding fixture body includes a base, a roller frame is provided above the base, and a vertical frame is provided above the base on the outer side of the roller frame. A vertical lifting mechanism is provided on one side of the vertical lifting mechanism, and a clamping and positioning fixture is provided on one side of the vertical lifting mechanism. A three-axis moving mechanism is provided above the other side of the vertical frame, and a circumferential welding mechanism is provided at the lower output end of the three-axis moving mechanism. A limiting and cleaning mechanism integrating clamping, limiting, and cleaning functions is provided on the outer side of the circumferential welding mechanism on the left side.

[0010] Preferably, the vertical lifting mechanism includes a slide bar disposed on one side of the upright, a slider disposed on the outside of the slide bar, a sliding seat disposed on the outside of the slider, a mounting seat disposed on the upper side of one side of the upright, and a vertical drive cylinder disposed on the mounting seat, with its output end connected to the sliding seat.

[0011] Preferably, the clamping and positioning fixture includes a rectangular mounting frame connected to the moving end of the vertical lifting mechanism. A closing clamping assembly is located below the mounting frame. The closing clamping assembly includes a fixed seat located at the lower corner of the mounting frame. A bidirectional lead screw is positioned between the two fixed seats. Lead screw nut seats are located on the front and rear outer sides of the bidirectional lead screw. A gripper component is located below the two lead screw nut seats on the same horizontal side. The gripper component includes a moving plate. A concave seat is located below the inner side of the moving plate. A rotatable and adjustable closing clamping cylinder is located within the concave seat. A concave plate is located below the outer side of the moving plate. A rotating rod is located below the concave plate. A rotating plate is located on the rotating rod inside the concave plate. An arc-shaped clamping plate is located on the rotating rod outside the concave plate. The upper ends of one clamping plate and the rotating plate are respectively connected to the output end of the closing clamping cylinder. The two sets of gripper components are centrally symmetrical about the geometric center of the mounting frame.

[0012] Preferably, the opening and closing clamping assembly is provided with a pressing mechanism, which includes a pressing cylinder disposed on one side of the moving plate, and a pressing plate is disposed at the output end of the pressing cylinder.

[0013] Preferably, the three-axis moving mechanism includes a mounting frame connected to the upright frame. A rodless cylinder is mounted on the mounting frame. A concave-shaped truss is mounted on the outer side of the rodless cylinder. A longitudinal moving plate is mounted on the output end of the rodless cylinder and above the truss. A vertical lifting drive cylinder is mounted on the longitudinal moving plate. A lifting plate is mounted on the output end of the vertical lifting drive cylinder. A limit rod is mounted above the lifting plate and extends through the longitudinal moving plate. A limit strip is mounted on the outer side of the lifting plate. A transverse moving plate is mounted on the outer side of the lifting plate and is adjustable relative to the limit strip. A transverse moving drive cylinder is mounted below the lifting plate, and its output end is connected to the transverse moving plate.

[0014] Preferably, the two sets of surrounding welding mechanisms are arranged symmetrically in a central configuration. The surrounding welding mechanism includes a frame plate with a C-shaped design connected to the output end of the three-axis moving mechanism. A drive gear is provided on the outer side of the frame plate, transmission gears are provided on both sides of the drive gear, and a mating gear is provided on the outer side of the transmission gear. A limiting plate with a C-shaped design is provided at the opening of the frame plate, and a ring rack with a C-shaped design is provided between the frame plate and the limiting plate.

[0015] Preferably, the limiting cleaning mechanism includes a C-shaped ring plate that rotates relative to the limiting plate located on the left and rotates together with the adjacent annular rack. A rotating rod is provided on the upper outer side of the ring plate, and a first connecting rod with an arc shape is provided on one side of the rotating rod. An adjusting plate with a Y-shape is provided on the lower side of the ring plate, and its short side is rotatably connected to the first connecting rod. A second connecting rod is provided on the outer side of the adjusting plate. A linkage plate with an acute angle is provided on the outer side of the other end of the ring plate, and its angle rotates relative to the ring plate. The other end of the second connecting rod is connected to one end of the linkage plate. Limiting rollers with cleaning functions are also provided at the ends of the rotating rod, the adjusting plate, and the linkage plate.

[0016] Preferably, welding assemblies are provided on the outer side of the end of the limiting cleaning mechanism on the left and on the outer side of the end of the surrounding welding mechanism on the right. The welding assemblies include rodless electric cylinders, and the moving end of the rodless electric cylinders is provided with a welding torch.

[0017] As a preferred embodiment, a pressure pipeline welding method is also provided, comprising the following steps: S1: The workpiece to be welded is received by the roller frames in the welding fixture body on the left and right sides and transported to the welding area. S2: After the workpiece to be welded is transported to a reasonable position, the vertical lifting mechanism is controlled to move, which drives the clamping and positioning fixture to approach the workpiece and clamp the workpiece. The operation of the equipment is adjusted according to the position of the workpiece to be welded so that the welding end faces are aligned. S3: After the two workpieces are aligned, control the three-axis moving mechanism to run and move the two sets of surrounding welding mechanisms from the front and rear sides to the outside of the workpiece. At the same time, the limiting cleaning mechanism is moved closer to the workpiece by the movement of the equipment and rotates inward until the workpiece is completely moved to the geometric center of the surrounding welding mechanism. The limiting cleaning mechanism comes into contact with the outer peripheral surface of the workpiece, thus playing a limiting role at the connection position of the two workpieces to a certain extent. S4: After the workpiece position is adjusted to the correct position, control the welding assembly to move so that the welding torch head is close to the welding joint of the workpiece. Then, control the left and right side surround welding mechanisms to run synchronously and carry out welding work around the outer perimeter of the workpiece, corresponding to the upper and lower parts of the workpiece respectively. The limiting cleaning mechanism on the left side surround welding mechanism cleans the outer perimeter of the workpiece in advance by rotating as it runs, and the welding torch then performs welding to ensure welding quality. S5: After the welding work is completed, control the three-axis moving mechanism to move it away from the workpiece, and then control the clamping and positioning fixture to place the workpiece on the roller frame so that the workpiece can be transported out to complete the welding work.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention provides a pressure pipeline welding fixture. Utilizing a vertical lifting mechanism, the fixture can be driven to move and adjust vertically, providing a prerequisite for workpiece clamping and positioning, and particularly ensuring the stability of the equipment components' positions. A three-axis moving mechanism, during its three-axis movement adjustment, can drive a surrounding welding mechanism closer to the workpiece. Two sets of centrally symmetrically arranged surrounding welding mechanisms can perform comprehensive welding processing on the outer periphery of the workpiece in a dual-station manner, ensuring the welding process is completed smoothly. Simultaneously, a limiting and cleaning mechanism rotates along with one set of surrounding welding mechanisms and engages with both workpieces. The outer periphery is fitted and abutted against, limiting its movement to a certain extent and preventing misalignment. Simultaneously, the rotation of the limiting and cleaning mechanism also performs a cleaning function on the interface of the workpiece to be processed, ensuring the quality of the welding process and meeting usage requirements. This device is reasonably designed, simple in structure, and easy to process. It uses a dual-station, surround-type welding equipment to perform the welding workpiece, integrating workpiece docking limiting and pre-welding cleaning functions to ensure the stability and accuracy of the workpiece's position during the welding cycle. It also cleans the welding interface to a certain extent to ensure its cleanliness, guaranteeing the quality of the workpiece welding, improving the work process, and effectively meeting usage requirements. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a pressure pipeline welding fixture; Figure 2 A front view of the structure of a pressure pipeline welding fixture; Figure 3 A side view of the structure of a pressure pipeline welding fixture; Figure 4 This is a schematic diagram of the vertical lifting mechanism; Figure 5 This is a structural diagram of the clamping and positioning fixture; Figure 6 This is a front view of the three-axis moving mechanism. Figure 7 This is a schematic diagram of the three-axis moving mechanism; Figure 8 This is a schematic diagram of the limiting cleaning mechanism; Figure 9 This is a schematic diagram of the structure of the wrap-around welding mechanism; In the above figures, 1. Base; 2. Stand; 3. Vertical lifting mechanism; 31. Sliding bar; 32. Sliding block; 33. Sliding seat; 34. Mounting seat; 35. Vertical drive cylinder; 4. Mounting frame; 5. Three-axis moving mechanism; 51. Mounting frame; 52. Rodless cylinder; 53. Truss; 54. Longitudinal moving plate; 55. Vertical lifting drive cylinder; 56. Lifting plate; 561. Limiting bar; 57. Limiting rod; 58. Transverse moving plate; 59. Transverse moving drive cylinder; 6. Circular welding mechanism; 61. Frame plate; 62. Drive gear; 63. Transmission gear; 64. Matching gear; 65. Limiting plate; 66. Ring 7. Rack and pinion; 8. Limiting cleaning mechanism; 9. Ring plate; 10. Rotating rod; 11. First connecting rod; 12. Adjusting plate; 13. Second connecting rod; 14. Linkage plate; 15. Limiting roller; 16. Opening and closing clamping assembly; 17. Fixed seat; 18. Bidirectional lead screw; 19. Lead screw nut seat; 10. Clamping claw assembly; 11. Moving plate; 12. Concave seat; 13. Opening and closing clamping cylinder; 14. Concave plate; 15. Rotating rod; 16. Rotating plate; 17. Clamping plate; 18. Pressing mechanism; 19. Pressing cylinder; 10. Pressing plate; 11. Welding assembly; 12. Rodless electric cylinder; 13. Welding torch. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Examples, such as Figures 1-9As shown, a pressure pipeline welding fixture includes two sets of welding fixture bodies arranged in a mirror image. Each welding fixture body includes a base 1 to ensure the stability of the equipment. A roller frame is mounted above the base 1 to ensure the stability and smoothness of the workpiece during transport, and to facilitate the removal of the workpiece after welding, ensuring the forming quality of the workpiece and meeting usage requirements. A vertical frame 2 is mounted above the base 1, located outside the roller frame. A vertical lifting mechanism 3 is mounted on one side of the vertical frame 2, and a clamping and positioning fixture is mounted on one side of the vertical lifting mechanism 3. The vertical lifting mechanism 3 can drive the clamping and positioning fixture to move and adjust vertically, providing a prerequisite for clamping and positioning the workpiece, especially ensuring the stability of the equipment components. On the other side of the support frame 2, a three-axis moving mechanism 5 is provided. During its movement and adjustment in three directions, it can drive the surrounding welding mechanism 6 to approach the workpiece to be processed. The output end of the three-axis moving mechanism 5 is provided with a surrounding welding mechanism 6. There are two sets of surrounding welding mechanisms 6 arranged in a centrally symmetrical manner, which can perform comprehensive welding processing on the outer periphery of the workpiece in a dual-station manner, ensuring the progress of the welding processing. On the outside of the left surrounding welding mechanism 6, a limiting and cleaning mechanism 7 integrating clamping, limiting and cleaning functions is provided. The limiting and cleaning mechanism 7 rotates together with one set of surrounding welding mechanisms 6 and is adapted to and abuts against the outer periphery of the two workpieces, limiting them to a certain extent and preventing the possibility of misalignment. In the above process: the vertical lifting mechanism 3 drives the clamping and positioning fixture to move and adjust vertically, providing a prerequisite for workpiece clamping and positioning, especially ensuring the stability of the equipment components. The three-axis moving mechanism 5 drives the surrounding welding mechanism 6 to approach the workpiece during its three-axis movement and adjustment. The two sets of surrounding welding mechanisms 6 arranged symmetrically in the center can perform comprehensive welding processing on the outer periphery of the workpiece in a dual-station manner, ensuring the progress of the welding process. At the same time, the limiting and cleaning mechanism 7 rotates together with one of the surrounding welding mechanisms 6 and matches and abuts against the outer periphery of the two workpieces, limiting them to a certain extent and preventing misalignment. In addition, the rotation of the limiting and cleaning mechanism 7 also performs a cleaning function on the interface of the workpiece to be processed, ensuring the quality of the welding process and meeting the usage requirements.

[0024] To improve the rationality of the device setup, the vertical lifting mechanism 3 includes a slide bar 31 located on one side of the stand 2, a slider 32 located on the outside of the slide bar 31, a sliding seat 33 located on the outside of the slider 32, and a mounting base 34 located above one side of the stand 2. A vertical drive cylinder 35 is mounted on the mounting base 34, and its output end is connected to the sliding seat 33. Specifically, according to the specifications and dimensions of the workpiece to be processed, the vertical drive cylinder 35 is controlled to move, thereby adjusting the position of the clamping and positioning fixture by moving it up and down. This allows the clamping and positioning fixture to move closer to the workpiece and complete the subsequent clamping and positioning function, providing convenient conditions for the subsequent welding work of the workpiece.

[0025] To facilitate the clamping of the pipe workpieces to be processed and ensure a tight fit at the joint between the two workpieces, the clamping and positioning fixture includes a rectangular mounting frame 4 connected to the moving end of the vertical lifting mechanism 3. A hinged clamping assembly 8 is located below the mounting frame 4. The hinged clamping assembly 8 includes fixed seats 81 located at the lower corners of the mounting frame 4. A bidirectional lead screw 82 is positioned between the two fixed seats 81. Lead screw nut seats 83 are located on the front and rear outer sides of the bidirectional lead screw 82. The movement of the two lead screw nut seats 83 on the same side is controlled by a single bidirectional lead screw 82, allowing the two lead screw nut seats 83 to move closer or further apart. The action can drive the gripper components 84 in the two opening and closing clamping assemblies 8 to move closer or further apart synchronously. Specifically, gripper components 84 are provided below the two lead screw nut seats 83 on the same side laterally. Each gripper component 84 includes a moving plate 841, with a concave seat 842 located on the lower inner side of the moving plate 841. A rotatably adjustable opening and closing clamping cylinder 843 is installed inside the concave seat 842. The output port of the opening and closing clamping cylinder 843 is rotatably connected to the concave seat 842. The reaction force during operation ensures smooth operation according to the rotation mode. Furthermore, the lower outer side of the moving plate 841... A concave plate 844 is provided on the square, and a rotating rod 845 is provided below the concave plate 844. A rotating plate 846 is provided on the rotating rod 845 located inside the concave plate 844, and an arc-shaped clamping plate 847 is provided on the rotating rod 845 located outside the concave plate 844. The upper ends of the clamping plate 847 and the rotating plate 846 are respectively connected to the output end of the opening and closing clamping cylinder 843. The two sets of gripper components 84 are centrally symmetrical about the geometric center of the mounting frame 4. Specifically, when the clamping and positioning fixture is adjusted to a suitable position by the vertical lifting mechanism 3, the opening and closing cylinder is controlled to extend, and the rotating plate 846 and the clamping plate 847 on the same side extend. The plate 847 is driven by the opening and closing clamping cylinder 843, which drives the rotating rod 845 to rotate relative to the concave plate 844. Of course, the rotating plate 846 and the clamping plate 847 are fixedly connected to the rotating rod 845. The two rotating plates 846 and the clamping plate 847 on the same side are driven to rotate together and rotate towards the geometric center of the mounting frame 4. The two front and rear gripper components 84 operate synchronously and rotate inward, thereby stably clamping the conveyed workpiece to ensure the smooth progress of its subsequent welding work. The longitudinal adjustment of the two gripper components 84 can adapt to workpieces of different specifications and sizes, greatly improving the functionality of the device.

[0026] To ensure the stability of the clamped workpiece, the opening and closing clamping assembly 8 is equipped with a pressing mechanism 9. The pressing mechanism 9 includes a pressing cylinder 91 located on one side of the moving plate 841. The output end of the pressing cylinder 91 is equipped with a pressure plate 92. Specifically, after the workpiece to be processed is stably clamped, the pressing cylinder 91 is controlled to run according to the cooperation of the ends of the two workpieces at the connection point, thereby driving the pressure plate 92 to press down on the outside of the workpiece. In conjunction with the vertical movement adjustment of the clamping and positioning fixture, the ends of the two pipes are made to be flush. At the same time, the operation of the pressing mechanism 9 can press the workpiece to make the vertical position of its processing end finely adjusted, reducing the possibility of misalignment and ensuring the quality of workpiece processing.

[0027] To ensure that the surround welding mechanism 6 can smoothly approach the workpiece for welding, the three-axis moving mechanism 5 includes a mounting frame 51 connected to the upright frame 2. A rodless cylinder 52 is mounted on the mounting frame 51, and a concave-shaped truss 53 is provided on the outer side of the rodless cylinder 52. A stabilizing frame is provided between the two sets of three-axis moving mechanisms 5 to ensure the stability of the equipment components and prevent displacement. A longitudinal movement plate 54 is provided at the output end of the rodless cylinder 52 and above the truss 53. During operation, it can drive the longitudinal moving plate 54 to move and adjust longitudinally, ensuring that the surrounding welding mechanism 6 can be moved to the outside of the pipe fitting, providing a prerequisite for subsequent processing. A vertical lifting drive cylinder 55 is installed on the longitudinal moving plate 54, and a lifting plate 56 is installed at the output end of the vertical lifting drive cylinder 55. A limit rod 57 is installed above the lifting plate 56 and extends through the longitudinal moving plate 54. A limit strip 561 is installed on the outside of the lifting plate 56, and a transverse moving plate 58 is installed on the outside of the lifting plate 56, which slides and adjusts relative to the limit strip 561. A transverse drive cylinder 59 is installed below plate 56, and its output end is connected to transverse plate 58. Specifically, during use, the longitudinal movement adjustment of the three-axis moving mechanism 5 allows the surround welding mechanism 6 to approach the connection point of the two workpieces. The vertical lifting adjustment makes the surround welding mechanism 6 correspond to the geometric center of the workpiece. The transverse movement adjustment makes the surround welding mechanism 6 move the limiting roller 77 in the limiting welding mechanism closer to the connection point of the two workpieces in the horizontal direction, especially making the welding gun 102 end of the welding assembly 10 correspond to the connection point of the workpiece, so as to ensure the smooth progress of the welding process. In other words, before use, the position of the surround welding mechanism 6 is adjusted in the vertical and horizontal directions. Then, the longitudinal movement adjustment of the three-axis moving mechanism 5 is used to move the surround welding mechanism 6 closer to the workpiece, thereby ensuring that the limiting cleaning mechanism 7 is close to the outside of the pipe workpiece and fits against the outer periphery of the workpiece. Then, the surround welding mechanism 6 is controlled to run and the welding work is carried out, which improves the functionality of the device, ensures the forming quality of the workpiece, and meets the usage requirements.

[0028] To ensure the smooth operation of welding, two sets of circular welding mechanisms 6 are arranged symmetrically around the center. Each circular welding mechanism 6 includes a C-shaped frame plate 61 connected to the output end of the three-axis moving mechanism 5. A drive gear 62 is located on the outer side of the frame plate 61, and transmission gears 63 are located on both sides of the drive gear 62. It should be further noted that the transmission gears 63 do not contact the annular rack 66, but mesh with the drive gear 62 and the mating gear 64 respectively. The mating gear 64 is located on the outer side of the transmission gear 63. A C-shaped limiting plate 65 is located at the opening of the frame plate 61. A C-shaped annular rack 66 is located between the frame plate 61 and the limiting plate 65. The annular rack 66 is rotatably positioned between the limiting plate 65 and the frame plate. Specifically, between 61, an extension frame is provided on the frame plate 61 near the outer side of the drive gear 62. A drive motor is provided on the extension frame to provide driving power for the drive gear 62. When the drive gear 62 rotates, it can drive the transmission gear 63 to rotate. When it rotates, it can mesh with the mating gear 64. The rotation of the mating gear 64 can act on the outer side of the ring rack 66. In this way, the ring rack 66 can rotate relative to the frame plate 61 and the limiting plate 65. During its operation, it can drive the limiting cleaning mechanism 7 on the left side of the ring welding mechanism 6 to rotate together. For the right side, the rotation of the ring rack 66 can directly drive the welding assembly 10 to rotate, so as to ensure the smooth progress of the welding work. It is simple and convenient to operate, has strong functionality, and meets the needs of use.

[0029] To both limit the connection at the workpiece to be welded and perform cleaning on its surface, the limiting and cleaning mechanism 7 includes a C-shaped ring plate 71 that rotates relative to the limiting plate 65 on the left and rotates together with the adjacent annular rack 66. A rotating rod 72 is located on the upper outer side of the ring plate 71, and a first connecting rod 73 with an arc shape is located on one side of the rotating rod 72. A Y-shaped adjusting plate 74 is located on the lower side of the ring plate 71, and its short side is rotatably connected to the first connecting rod 73. A second connecting rod 75 is located on the outer side of the adjusting plate 74. A linkage plate 76 with an acute angle is located on the outer side of the other end of the ring plate 71, and its angle rotates relative to the ring plate 71. The other end of the second connecting rod 75 is connected to the linkage plate 76. The ends of the rotating rod 72, adjusting plate 74, and linkage plate 76 are connected to each other. Each end of these components is also equipped with a limiting roller 77 with a cleaning function. Specifically, the limiting roller 77 is rotatably connected to its connection point and has a certain degree of damping. When the limiting cleaning mechanism 7 moves towards the workpiece along with the surrounding welding mechanism 6, the opening end of the surrounding welding mechanism 6 needs to maintain correspondence with the workpiece before controlling its longitudinal movement. When the limiting cleaning mechanism 7 approaches the workpiece, the limiting roller 77 is in pre-contact with the outer periphery of the workpiece. When the limiting roller 77 on the linkage plate 76 contacts the workpiece, its movement corresponds to the position of the workpiece and has an inward pressing force. When the linkage plate 76 is pressed inward, its other end... The rotation of the first connecting rod 75 will act on the second connecting rod 75, pulling the adjusting plate 74 to rotate. The limiting rollers 77 on the adjusting plate 74 will rotate outward. At the same time, the rotation of the adjusting plate 74 will act on the first connecting rod 73, pulling the connecting rod to rotate outward. During this process, the pipe workpiece can smoothly enter the limiting cleaning mechanism 7. When the pipe workpiece is completely placed inside, after the pressing force disappears, each limiting roller 77 can be restricted by the specification position of the workpiece to make the limiting roller 77 fit with the outer periphery of the workpiece. Then, the control of the surrounding welding mechanism 6 is adjusted to the initial position, and the limiting cleaning mechanism 7 also rotates. The limiting rollers 77 clean the outer periphery connection of the workpiece in advance with its rotation. Then, the control of the surrounding welding mechanism 6 is reversed to rotate. The two sets of surrounding welding mechanisms 6 are at the same position. In opposing positions and rotating synchronously, the limiting roller 77 in the limiting cleaning mechanism 7, positioned earlier than the welding torch 102, cleans the pipe fitting as it rotates. The welding torch 102 then performs cleaning. Meanwhile, in another set of encircling welding mechanisms 6, after welding the workpiece, the limiting roller 77, positioned behind it, can pre-clean the weld seam to some extent as it passes the already welded area, facilitating the subsequent removal and reprocessing of the workpiece. Furthermore, the limiting cleaning mechanism 7, in addition to its cleaning function, also has a limiting function. Specifically, its position is pre-adjusted by the three-axis moving mechanism 5, and then the limiting roller 77 contacts the outer periphery of the workpiece. During its rotation, the limiting roller 77 adheres to the outer periphery of the workpiece, assisting in the clamping and positioning fixture.This is used to limit the connection between two workpieces, preventing misalignment and ensuring the quality of the workpiece machining.

[0030] To ensure smooth welding operations and facilitate processing, welding components 10 are installed on the outer sides of the left limiting cleaning mechanism 7 and the right surrounding welding mechanism 6, respectively. Each welding component 10 includes a rodless electric cylinder 101, with a welding torch 102 mounted on its moving end. Specifically, when the surrounding welding mechanism 6 moves longitudinally to allow the workpiece to enter, the welding torch 102 moves to its furthest position to prevent interference with the pipe's entry. Once the workpiece is in the correct position, the rodless electric cylinder 101 is controlled to move, driving the welding torch 102 to move, particularly bringing its working end close to the connection point of the two workpieces. At this time, the welding components 10 located at the ends of the left limiting cleaning mechanism 7 and the right surrounding welding mechanism 6 rotate with its surrounding rotation, thus performing welding operations on both sides of the pipe from opposing positions. This comprehensive coverage improves the work process to a certain extent. Of course, the type of welding torch 102 can be freely selected according to specific usage requirements.

[0031] To ensure the smooth progress of pressure pipeline welding work, guarantee the quality of the welded pipe, and improve the work process, a pressure pipeline welding method is also provided, including the following steps: S1: The workpiece to be welded is received by the roller frames in the welding fixture body on the left and right sides and transported to the welding area. S2: After the workpiece to be welded is transported to a reasonable position, the vertical lifting mechanism 3 is controlled to run, which drives the clamping and positioning fixture to approach the workpiece and clamp the workpiece. The operation of the equipment is adjusted according to the position of the workpiece to be welded so that the welding end faces are aligned. Among them, the clamping and positioning fixture can be adapted to clamp workpieces of different specifications and sizes to improve the practicality of the device. At the same time, it works in conjunction with the operation of its internal pressing mechanism 9, especially to press the workpiece so that the position of its processing end in the vertical direction can be finely adjusted, reducing the possibility of misalignment and ensuring the quality of workpiece processing. S3: After the two workpieces are aligned, control the three-axis moving mechanism 5 to run, and move the two sets of surrounding welding mechanisms 6 from the front and rear sides to the outside of the workpiece. At the same time, the limiting cleaning mechanism 7 is moved closer to the workpiece by the movement of the equipment and rotates inward until the workpiece is completely moved to the geometric center of the surrounding welding mechanism 6, and the limiting cleaning mechanism 7 comes into contact with the outer peripheral surface of the workpiece, thereby playing a limiting role at the connection position of the two workpieces to a certain extent. Among them, the two sets of centrally symmetrically arranged ring welding mechanisms 6 can perform comprehensive welding processing on the outer periphery of the workpiece in a dual-station manner, ensuring the progress of the welding processing work. S4: After the workpiece position is adjusted to the correct position, control the welding assembly 10 to move so that the welding torch 102 head is close to the welding joint of the workpiece. Then, control the left and right side surround welding mechanisms 6 to run synchronously and carry out welding work around the outer periphery of the workpiece, respectively corresponding to the upper and lower parts of the workpiece. Among them, the limit cleaning mechanism 7 on the left side surround welding mechanism 6 cleans the outer periphery of the workpiece in advance by rotating as it runs, and the welding torch 102 then performs welding, thereby ensuring the welding quality. Among them, the limiting cleaning mechanism 7 rotates together with one of the surrounding welding mechanisms 6 and matches and abuts against the outer periphery of the two workpieces, limiting them to a certain extent and preventing misalignment. At the same time, the rotation of the limiting cleaning mechanism 7 will also perform a cleaning function on the interface of the workpiece to be processed, ensuring the quality of welding processing and meeting the usage requirements. S5: After the welding work is completed, control the three-axis moving mechanism 5 to move so that it is separated from the workpiece, and then control the clamping and positioning fixture to place the workpiece on the roller frame so that the workpiece is conveyed out and the welding work is completed. In the above process: This device is reasonably designed, simple in structure, and easy to process. It uses a dual-station surround welding equipment to perform the welding work of the workpiece, and integrates the workpiece docking limit and pre-welding cleaning functions to ensure the stability and accuracy of the workpiece's position during the welding cycle. At the same time, it cleans the welding interface to a certain extent to ensure its cleanliness, guarantee the quality of the workpiece welding, improve the work process, and effectively meet the usage requirements.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A pressure pipeline welding fixture, comprising two sets of welding fixture bodies arranged in a mirror image, characterized in that, The welding fixture body includes a base, a roller frame is provided on the top of the base, and a vertical frame is provided on the top of the base outside the roller frame. A vertical lifting mechanism is provided on one side of the vertical lifting mechanism, and a clamping and positioning fixture is provided on one side of the vertical lifting mechanism. A three-axis moving mechanism is provided on the top of the other side of the vertical frame, and a surround welding mechanism is provided at the lower output end of the three-axis moving mechanism. A limiting and cleaning mechanism integrating clamping, limiting and cleaning functions is provided on the outside of the surround welding mechanism on the left side.

2. The pressure pipeline welding fixture according to claim 1, characterized in that, The vertical lifting mechanism includes a slide bar set on one side of the upright, a slider on the outside of the slide bar, a sliding seat on the outside of the slider, a mounting seat on the upper side of one side of the upright, a vertical drive cylinder on the mounting seat, and its output end connected to the sliding seat.

3. The pressure pipeline welding fixture according to claim 2, characterized in that, The clamping and positioning fixture includes a rectangular mounting frame connected to the moving end of the vertical lifting mechanism. A closing clamping assembly is located below the mounting frame. This assembly includes fixed seats at the lower corners of the mounting frame. A bidirectional lead screw is positioned between the two fixed seats. Lead screw nut seats are located on the front and rear outer sides of the bidirectional lead screw. A gripper component is located below the two lead screw nut seats on the same horizontal side. The gripper component includes a moving plate. A concave seat is located below the inner side of the moving plate. A rotatable and adjustable closing clamping cylinder is located within the concave seat. A concave plate is located below the outer side of the moving plate. A rotating rod is located below the concave plate. A rotating plate is located on the rotating rod inside the concave plate. An arc-shaped clamping plate is located on the rotating rod outside the concave plate. The upper ends of one clamping plate and the rotating plate are connected to the output end of the closing clamping cylinder. The two sets of gripper components are centrally symmetrical about the geometric center of the mounting frame.

4. The pressure pipeline welding fixture according to claim 3, characterized in that, The opening and closing clamping assembly is provided with a pressing mechanism, which includes a pressing cylinder located on one side of the moving plate, and a pressing plate is provided at the output end of the pressing cylinder.

5. The pressure pipeline welding fixture according to claim 4, characterized in that, The three-axis moving mechanism includes a mounting frame connected to the upright frame. A rodless cylinder is mounted on the mounting frame. A concave-shaped truss is mounted on the outside of the rodless cylinder. A longitudinal moving plate is mounted on the output end of the rodless cylinder and above the truss. A vertical lifting drive cylinder is mounted on the longitudinal moving plate. A lifting plate is mounted on the output end of the vertical lifting drive cylinder. A limit rod is mounted above the lifting plate and extends through the longitudinal moving plate. A limit strip is mounted on the outside of the lifting plate. A transverse moving plate is mounted on the outside of the lifting plate and is adjustable relative to the limit strip. A transverse moving drive cylinder is mounted below the lifting plate, and its output end is connected to the transverse moving plate.

6. The pressure pipeline welding fixture according to claim 5, characterized in that, Two sets of encircling welding mechanisms are arranged symmetrically at the center. The encircling welding mechanism includes a frame plate with a C-shaped design connected to the output end of the three-axis moving mechanism. A drive gear is provided on the outside of the frame plate, and transmission gears are provided on both sides of the drive gear. A mating gear is provided on the outside of the transmission gear. A limiting plate with a C-shaped design is provided at the opening of the frame plate, and a ring rack with a C-shaped design is provided between the frame plate and the limiting plate.

7. A pressure pipeline welding fixture according to claim 6, characterized in that, The limiting cleaning mechanism includes a C-shaped ring plate that rotates relative to the limiting plate on the left and rotates together with the adjacent annular rack. A rotating rod is provided on the upper outer side of the ring plate, and a first connecting rod with an arc shape is provided on one side of the rotating rod. An adjusting plate with a Y-shape is provided on the lower side of the ring plate, and its short side is rotatably connected to the first connecting rod. A second connecting rod is provided on the outer side of the adjusting plate. A linkage plate with an acute angle is provided on the outer side of the other end of the ring plate, and its angle rotates relative to the ring plate. The other end of the second connecting rod is connected to one end of the linkage plate. The ends of the rotating rod, adjusting plate, and linkage plate are also provided with limiting rollers with cleaning functions.

8. A pressure pipeline welding fixture according to claim 7, characterized in that, Welding assemblies are respectively provided on the outer side of the end of the limiting cleaning mechanism on the left and on the outer side of the end of the surrounding welding mechanism on the right. The welding assembly includes a rodless electric cylinder, and a welding gun is provided on the moving end of the rodless electric cylinder.

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