Repair welding device for spiral pipe

Abstract

The invention relates to the technical field of pipe fitting welding, in particular to a spiral pipe repair welding device which comprises a welding assembly and a guide rail which are arranged front and back, two axial limiting mechanisms which are symmetrically arranged left and right are arranged on the guide rail in a left-right sliding mode, and a plurality of rotating supporting mechanisms are arranged in the middle of the guide rail left and right. The rotary supporting mechanism has three working states of a first mode, a second mode and a third mode, and the three working states can correspond to the three conditions that repair welding seams are short, medium and long correspondingly, so that the repair welding requirements of the welding seams with different lengths are met in a targeted welding mode, and on the premise that the rotation stability of the spiral pipe is effectively guaranteed, the repair welding efficiency is improved. In the whole welding process, the supporting wheels do not make contact with protruding weld joints on the surface of the spiral pipe, so that the tracking precision of a welding assembly on the weld joints and the stability of a welding pool are guaranteed, and the repair welding quality and efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of pipe welding technology, specifically a spiral pipe repair welding device. Background Technology

[0002] The manufacturing process of spiral pipe mainly includes key steps such as forming, welding and flaw detection. First, the steel strip is spirally rolled to form a pipe body. Then, it is continuously welded along the spiral seam by welding equipment to form a complete pipe structure. Subsequently, the weld seam needs to be inspected to ensure that its sealing and strength meet the standards. If the flaw detection finds defects or unqualified sections in the weld seam, the position needs to be treated and transferred to the repair welding station for repair welding.

[0003] Currently, the equipment used for repair welding of carbon steel and low alloy steel spiral pipes with diameters ranging from φ426mm to φ3200mm and wall thicknesses from 6mm to 26mm typically includes a rotating platform, a control system, and a welding torch. During repair welding, the operator moves the spiral pipe to be repaired onto the rotating platform. The control system drives the welding torch to move to the starting end of the spiral weld and aligns it with the weld position. Subsequently, the rotating platform drives the spiral pipe to rotate slowly and uniformly. At the same time, the welding system controls the welding torch to move synchronously and uniformly along the pipe axis, ensuring that the welding torch is always aligned with the spiral weld trajectory. When the welding torch moves to the defect position that needs to be repaired, the welding program is started to carry out the repair welding operation.

[0004] However, existing rotating platforms are usually fixed structures, and the position of their support rollers cannot be adjusted during the welding process. When the spiral tube is placed on the support rollers and rotates, the existing spiral-shaped raised weld seam on the tube surface is prone to contact with the support rollers during the rotation, which causes the tube to vibrate and affects the stability and welding quality of the repair welding process.

[0005] To alleviate the above problems, the commonly adopted measure is to adjust the weld seam of the spiral tube to the gap between the rollers on both sides of the rotating platform before welding, so as to avoid direct contact between the weld seam and the rollers as much as possible. However, this method is only suitable for situations where the weld seam is short and the spiral tube rotates a few times. When the weld seam to be welded is long and the spiral tube needs to rotate continuously for many turns, the existing support rollers will not be able to avoid the original spiral weld seam, thus inevitably causing interference. This leads to increased vibration of the spiral tube during welding, which seriously interferes with the tracking accuracy of the welding torch on the weld seam and the stability of the weld pool, ultimately affecting the quality and efficiency of the welding.

[0006] Therefore, there is an urgent need for a welding repair device that can adapt to the welding repair needs of welds of different lengths and effectively avoid interference between the weld and the supporting structure. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a spiral tube repair welding device, including a welding assembly and a guide rail arranged in front and behind, two axial limiting mechanisms arranged symmetrically in the left and right sides on the guide rail, and several rotating support mechanisms arranged in the middle of the guide rail.

[0008] The axial limiting mechanism includes a movable frame that slides on a guide rail. Several abutting rollers are connected to the movable frame via a telescopic component. The telescopic component selectively extends out of the abutting rollers at corresponding positions to fit and limit the movement at the end of the spiral tube.

[0009] The rotating support mechanism includes an electric slide table that slides on a guide rail. Four support wheels are arranged circumferentially on the electric slide table via an adjustment component. A rotating component is provided on the electric slide table to rotate the angle of the support wheels.

[0010] The rotating support mechanism includes three working states: Mode 1, Mode 2, and Mode 3. Mode 1 is suitable for repairing short welds, in which case the electric slide is fixed. Mode 2 is suitable for repairing medium-sized welds, in which case the rotating component adjusts the support wheels to a suitable angle, and each electric slide moves synchronously in the spiral propulsion direction of the spiral tube weld, thereby allowing the support wheels to avoid the weld. Mode 3 is suitable for repairing long welds, in which case the electric slide does not move, and the adjusting component retracts the corresponding support wheels to avoid the weld.

[0011] Preferably, the telescopic assembly includes four square shells arranged circumferentially on the movable frame, with a roller frame slidingly passing through the center of each square shell, and the roller frame being rotatably connected to the abutment roller.

[0012] Preferably, an electric slider is fixedly installed at one end of the square shell near the movable frame. The electric slider is slidably connected to the movable frame. By independently adjusting the four electric sliders, the four abutting rollers correspond to the ends of the spiral tubes of different diameters.

[0013] Preferably, a sensor is fixedly installed on the side of the square shell facing the opposite direction of the rotation of the spiral tube, and a hydraulic cylinder is fixedly installed on the electric slider. The telescopic section of the hydraulic cylinder is fixedly connected to the corresponding roller frame.

[0014] Preferably, the adjustment component includes a rotating sleeve rotatably mounted on the electric slide and corresponding to each support wheel, with a wheel frame slidingly inserted inside the rotating sleeve, and the wheel frame being rotatably connected to the support wheel at the corresponding position.

[0015] Preferably, a second sensor corresponding to each support wheel is fixedly installed on the electric slide, and the second sensor is located on the side opposite to the rotation of the corresponding support wheel toward the spiral tube.

[0016] Preferably, four hydraulic cylinders 2, each driving a corresponding wheel frame, are fixedly installed on the electric slide. When sensor 2 sends a signal that a weld seam has been detected, the telescopic section of the hydraulic cylinder 2 at the corresponding position is controlled to retract.

[0017] Preferably, the rotating assembly includes a driven gear fixedly installed on the outside of the rotating sleeve, a driving gear rotatably mounted on the electric slide and meshing with the driven gear, and four servo reduction motors that drive the corresponding driving gears are fixedly installed on the electric slide.

[0018] Preferably, the number of teeth of the driven gear is greater than that of the driving gear, so that the driving gear and the driven gear form a reduction gear pair.

[0019] Preferably, a servo direct drive motor is fixedly installed on one side of the wheel frame. The output shaft of the servo direct drive motor is connected to the corresponding support wheel, and the servo direct drive motor drives all support wheels to rotate synchronously and at the same speed.

[0020] The beneficial effects of this invention are as follows: First, the rotating support mechanism of this invention has three working states: Mode 1, Mode 2, and Mode 3, which can respectively correspond to the three situations of short, medium, and long weld seams. This allows for targeted welding methods to address the welding needs of weld seams of different lengths. Under the premise of effectively ensuring the smooth rotation of the spiral tube, the support wheel does not come into contact with the protruding weld seam on the surface of the spiral tube during the entire welding process. This ensures the tracking accuracy of the welding assembly for the weld seam and the stability of the weld pool, significantly improving the quality and efficiency of the welding repair.

[0021] Second, when repairing a shorter weld seam using Mode 1 of this invention, the electric slide is fixed between the two sides of the weld seam, and the support wheel maintains continuous rolling support for the tube body, so that the weld seam will not move to the position of the support wheel during the small-angle rotation of the spiral tube, thereby achieving stable support for the spiral tube, minimizing the vibration of the spiral tube in Mode 1, and ensuring the welding quality of the short weld seam.

[0022] Third, when using Mode 2 to repair welds of medium length welds, the angle of the support wheel is pre-adjusted by the rotating component, and each electric slide is controlled to move synchronously along the guide rail towards the spiral advance direction of the spiral tube weld. This allows the support wheel to maintain stable rolling support of the spiral tube while axially avoiding the weld, thereby extending the number of rotations of the spiral tube. This effectively prevents vibration caused by the original weld of the spiral tube contacting the support wheel when repairing medium length welds, ensuring the stability and quality of the welding process.

[0023] Fourth, when using Mode 3 to repair longer welds, the electric slide table is fixed in position. The extension and retraction of each support wheel is controlled by the adjustment component. When sensor 2 detects that the protruding spiral weld is about to contact a certain support wheel, the corresponding hydraulic cylinder 2 is controlled to retract, so that the support wheel moves down to avoid the weld. By controlling the avoidance actions of different support wheels on the same electric slide table in sequence, the spiral tube can be rotated continuously and smoothly, thereby performing high-quality and continuous repair welding operations on longer welds. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the welding assembly used in this invention for repair welding of the spiral tube.

[0027] Figure 3 This is a partial structural diagram of the movable frame, telescopic assembly, and abutment roller in this invention.

[0028] Figure 4 This is a partial cross-sectional view of the movable frame, hydraulic cylinder 1, abutment roller, and sensor 1 in this invention.

[0029] Figure 5 This is a side view of the electric slide, adjustment assembly, support wheel and rotation assembly in this invention.

[0030] Figure 6 This is a partial cross-sectional view of the electric slide, sensor two, hydraulic cylinder two, and support wheel in this invention.

[0031] Figure 7 This is a partial cross-sectional view of the electric slide, sensor two, hydraulic cylinder two, and wheel frame in this invention.

[0032] In the diagram: 1. Welding assembly; 2. Guide rail; 3. Axial limiting mechanism; 4. Rotating support mechanism; 31. Moving frame; 32. Telescopic assembly; 33. Abutting roller; 41. Electric slide table; 42. Adjustment assembly; 43. Support wheel; 44. Rotating assembly; 45. Servo direct drive motor; 321. Square shell; 322. Roller frame; 323. Electric slider; 324. Sensor 1; 325. Hydraulic cylinder 1; 421. Rotating sleeve; 422. Wheel frame; 423. Sensor 2; 424. Hydraulic cylinder 2; 441. Driven gear; 442. Drive gear; 443. Servo geared motor. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0034] See Figure 1 and Figure 2 A spiral pipe repair welding device includes a welding assembly 1 arranged in front and behind and a guide rail 2. Two axial limiting mechanisms 3 are symmetrically arranged on the left and right sides of the guide rail 2. Several rotating support mechanisms 4 are arranged on the left and right sides of the middle of the guide rail 2.

[0035] The welding assembly 1 in this embodiment includes a vertical guide rod installed on the ground. A horizontal guide plate is slidably mounted on the outer side of the vertical guide rod. A welding frame is slidably mounted on the horizontal guide plate. A welding torch that can extend and retract is mounted on the welding frame. The welding assembly 1 also includes a power component integrated on the vertical guide rod, the horizontal guide plate, and the welding frame. This power component can autonomously drive the horizontal guide plate to move up and down, the welding frame to move left and right, and the welding torch to extend and retract. This is a common technical means. Through this power component, the welding torch can be accurately positioned to the weld seam. In addition, a laser positioning and correction component is provided on the welding frame to ensure that the welding torch always accurately corresponds to the weld seam.

[0036] When it is necessary to repair the spiral tube by welding, the operator moves the welding torch to the end of the spiral tube on the rotating support mechanism 4. At this time, the axial limiting mechanism 3 limits both ends of the spiral tube to prevent axial movement of the spiral tube during rotation welding. Then, the spiral tube is rotated by the rotating support mechanism 4 so that the welding torch is aligned with the starting end of the weld. Then, the spiral tube is slowly and uniformly rotated by the rotating support mechanism 4, while the welding torch is moved synchronously and uniformly along the axial direction of the tube body so that the welding torch is always aligned with the spiral weld trajectory.

[0037] When the welding torch is moved to the defect location that needs to be repaired, the rotation of the spiral tube is stopped. Then, the rotation support mechanism 4 is adjusted according to the length to be repaired, and the welding program is started, so that the spiral tube rotates slowly and uniformly, and the welding torch moves slowly and uniformly axially in sync, thereby performing repair welding on the spiral weld. When the repair welding of one position of the spiral tube is completed, the rotation of the spiral tube and the movement of the welding torch are stopped. After the operator has checked the repair welding quality, the spiral tube is rotated and the welding torch is moved to the next repair welding position again, and so on, until the welding operation of all repair welding positions on the spiral tube is completed.

[0038] See Figure 1 , Figure 3 and Figure 4 The axial limiting mechanism 3 includes a movable frame 31 that slides on the guide rail 2. Several abutting rollers 33 are connected to the movable frame 31 through a telescopic component 32. The telescopic component 32 selectively extends the abutting rollers 33 at corresponding positions to fit and limit them at the end of the spiral tube. The telescopic component 32 includes four square shells 321 arranged circumferentially on the movable frame 31. A roller frame 322 slides through the center of the square shell 321. The roller frame 322 is rotatably connected to the abutting rollers 33.

[0039] See Figure 3 and Figure 4An electric slider 323 is fixedly installed at one end of the square shell 321 near the movable frame 31. The electric slider 323 is slidably connected to the movable frame 31. By independently adjusting the four electric sliders 323, the four abutting rollers 33 correspond to the ends of the spiral tubes of different diameters. A sensor 324 is fixedly installed on the side of the square shell 321 facing the opposite direction of the spiral tube rotation. A hydraulic cylinder 325 is fixedly installed on the electric slider 323. The telescopic section of the hydraulic cylinder 325 is fixedly connected to the corresponding roller frame 322.

[0040] When it is necessary to repair the spiral tube by welding, the extension section of the hydraulic cylinder 325 pushes the roller frame 322 to move, so that the roller frame 322 drives the abutment roller 33 to abut against the end face side wall of the spiral tube. Thus, the abutment rollers 33 on the left and right sides of the spiral tube limit the spiral tube to prevent axial movement when rotating, thereby ensuring that the welding gun is always accurately aligned with the weld and thus ensuring the quality of the repair welding.

[0041] In this embodiment, sensor 324 is a vision sensor in the prior art, which has the functions of image acquisition, image preprocessing, feature extraction, and position calculation. It can efficiently capture the position of the weld on the end face of the spiral tube through a high sampling rate. Since sensor 324 is installed on the side opposite to the rotation of the spiral tube to the corresponding hydraulic cylinder 325, sensor 324 can capture and send the position information of the weld to the host computer in advance. The host computer then controls the extension section of the hydraulic cylinder 325 at that position to retract, thereby causing the roller frame 322 at that position to drive the corresponding abutment roller 33 to move to a position where it does not contact the spiral tube. This prevents the spiral tube from vibrating when the weld comes into contact with the abutment roller 33, thus affecting the quality of the repair weld.

[0042] Subsequently, when the weld position moves to the position of the next sensor 324, the host computer controls the extension section of the hydraulic cylinder 325 corresponding to the weld position to retract, while simultaneously controlling the extension section of the hydraulic cylinder 325 at the previous position to extend and reset, thereby achieving dynamic avoidance of the weld while abutting against the axial limit spiral tube of the roller 33.

[0043] In this embodiment, the four electric sliders 323 are arranged vertically and horizontally. When the diameter of the welded spiral tube is different, the height of the spiral tube axis will change accordingly. At this time, by independently moving the two vertically arranged electric sliders 323 vertically and horizontally, and independently moving the two horizontally arranged electric sliders 323 horizontally and horizontally, the abutment roller 33 can be moved to contact the end face of the spiral tube, thereby adapting to the axial positioning of spiral tubes of different diameters.

[0044] It should be noted that the movable frame 31 integrates mature existing track movement technology. Through this technology, the movable frame 31 can be actively controlled to move in the left and right directions, thereby adjusting the distance between the two movable frames 31, so that the abutting roller 33 can abut and limit the spiral tubes of different lengths.

[0045] See Figure 1 , Figure 5 , Figure 6 and Figure 7 The rotating support mechanism 4 includes three working states: mode one, mode two, and mode three. The rotating support mechanism 4 includes an electric slide table 41 that slides on the guide rail 2. Four support wheels 43 are arranged circumferentially on the electric slide table 41 through an adjustment component 42. The adjustment component 42 includes a rotating sleeve 421 that is rotatably mounted on the electric slide table 41 and corresponds one-to-one with the support wheels 43. A wheel frame 422 is slidably inserted inside the rotating sleeve 421 along its axial direction. The wheel frame 422 is rotatably connected to the support wheel 43 at the corresponding position. A servo direct drive motor 45 is fixedly installed on one side of the wheel frame 422. The output shaft of the servo direct drive motor 45 is connected to the corresponding support wheel 43. The servo direct drive motor 45 drives all the support wheels 43 to rotate synchronously and at the same speed. Four hydraulic cylinders 424 that drive the corresponding wheel frames 422 are fixedly installed on the electric slide table 41. The telescopic section of the hydraulic cylinder 424 is rotatably connected to the corresponding wheel frame 422.

[0046] It is worth noting that although this embodiment uses multiple servo direct drive motors 45 to control the rotation of the support wheels 43, since multiple support wheels 43 drive the spiral tube to rotate simultaneously, the single servo direct drive motor 45 does not need to be a model with a high rated output power. This also makes the size of the servo direct drive motor 45 small, which can be used in the narrow space at the bottom of the spiral tube. Furthermore, through the servo closed-loop control characteristics of the servo direct drive motor 45 itself, all support wheels 43 can rotate synchronously, preventing the slippage of a single support wheel 43.

[0047] It should be noted that by inputting the diameter parameter of the spiral tube to be repaired into the host computer, the host computer can control the hydraulic cylinder 424 on the same electric slide 41 to automatically adjust the extension length in advance. This allows the hydraulic cylinder 424 to drive the corresponding support wheel 43 to move by pushing the wheel frame 422. Consequently, the four support wheels 43 on the same electric slide 41 are arranged in an arc shape that matches the diameter of the spiral tube to be repaired, so that all four support wheels 43 on the same electric slide 41 can contact and support the spiral tube.

[0048] See Figure 5 , Figure 6 and Figure 7 The electric slide table 41 is provided with a rotating assembly 44 that rotates the support wheel 43 at an angle. The rotating assembly 44 includes a driven gear 441 fixedly installed on the outside of the rotating sleeve 421. The electric slide table 41 is rotatably provided with a driving gear 442 that meshes with the driven gear 441. The electric slide table 41 is fixedly installed with four servo reduction motors 443 that drive the corresponding driving gears 442 respectively.

[0049] When it is necessary to repair a short weld (less than 2 / 3 of the spiral weld pitch), the working state of mode one is activated. First, the servo geared motor 443 is started to rotate, so that the servo geared motor 443 drives the rotating sleeve 421 to rotate through the transmission of the driving gear 442 and the driven gear 441. The rotating sleeve 421 drives the support wheel 43 to rotate through the wheel frame 422, so that the support wheel 43 rotates until its axis is perpendicular to the axis of the spiral tube. Then, the support wheel 43 can roll left and right along the outer wall of the spiral tube.

[0050] Subsequently, the host computer controls each electric slide 41 to move between the two sides of the spiral weld seam. Then, each electric slide 41 is fixed in place, so that there is a distance between the abutting roller 33 on the electric slide 41 and the weld seam. Then, the angle of the support wheel 43 is reset so that the axis of the support wheel 43 is parallel to the axis of the spiral tube. Then, all the servo direct drive motors 45 are started at the same time to drive all the support wheels 43 to rotate synchronously, so that the support wheels 43 drive the spiral tube to start rotating. At the same time, the welding torch is moved synchronously along the tube body axis, so that the welding torch is always aligned with the spiral weld seam trajectory for repair welding. And between the contact between the spiral weld seam and the support wheel 43, the repair welding operation of the shorter weld seam is completed.

[0051] It should be noted that the rotation speed and start-stop curve of the support wheel 43 have been calculated by our technicians to be precisely matched with the axial movement speed and start-stop curve of the welding torch. In addition, the laser positioning and correction components on the welding machine frame can make real-time fine adjustments to the welding torch, so that the welding torch always accurately corresponds to the weld seam during the repair welding process.

[0052] When it is necessary to repair welds of medium length (greater than 2 / 3 of the spiral weld pitch and less than twice the spiral weld pitch), the second working state is activated. The support wheel 43 is moved between the two sides of the spiral weld, the principle is the same as the first mode. Then, the servo reduction motor 443 is used to adjust the tilt of the support wheel 43. Then, welding is started. While the spiral tube rotates, the electric slide 41 moves synchronously in the spiral propulsion direction of the spiral tube weld. The electric slide 41 drives the support wheel 43 to move and avoid the weld while rolling and supporting the spiral tube, thereby preventing the weld of the spiral tube from contacting the support wheel 43 and ensuring the quality of the repair weld.

[0053] It should be noted that in mode two, the angle between the axis of the support wheel 43 and the axis of the spiral tube should be equal to the helix angle of the spiral weld. This configuration ensures that while the support wheel 43 actively rotates to drive the spiral tube to rotate, it moves along the axial direction of the spiral tube and accurately tracks the weld direction, reducing relative slippage and improving motion stability and tracking accuracy.

[0054] It is worth noting that the electric slide 41 can be integrated with a structure for cleaning and lubrication of the guide rail 2, so that the electric slide 41 can always be precisely matched with the guide rail 2, thereby enabling the electric slide 41 to move on the guide rail 2 with high precision, low resistance and high stability, and preventing vibration during movement from affecting the quality of spiral tube repair welding.

[0055] Continue reading Figure 5 , Figure 6 and Figure 7 The electric slide table 41 is fixedly equipped with a sensor 423 corresponding to the support wheel 43. The sensor 423 is located on the side opposite to the rotation of the spiral tube of the corresponding support wheel 43. When the sensor 423 sends a signal that the weld seam is detected, it controls the extension section of the hydraulic cylinder 424 at the corresponding position to retract. The sensor 423 adopts a vision sensor with the same function and configuration as the sensor 324.

[0056] When it is necessary to repair a long weld (greater than twice the pitch of the spiral weld), the working state of mode three is activated. In this state, the axis of the support wheel 43 is arranged parallel to the axis of the spiral tube. When the spiral tube is rotated by the support wheel 43, the position information of the weld is captured and sent to the host computer in real time by the second sensor 423. The position of the second sensor 423 is used to make the second sensor 423 correspond to the weld before the support wheel 43. This allows the host computer to control the second hydraulic cylinder 424 to retract its extension section in time and drive the support wheel 43 to move down to avoid the weld. By controlling the downward movement of different support wheels 43 on the same electric slide 41 in sequence, the spiral tube can be rotated continuously and smoothly, so as to carry out high-quality and continuous repair welding operations on long welds.

[0057] It should be noted that the four support wheels 43 on the same electric slide 41 are all arranged at the lower part of the spiral tube, and the four support wheels 43 are arranged symmetrically front and back. This allows the four support wheels 43 to limit the front and back position of the spiral tube while avoiding collisions. For example, when the foremost support wheel 43 moves down, the front side of the spiral tube can also be limited by the second support wheel 43 from front to back to prevent the spiral tube from moving back and forth and to ensure welding quality.

[0058] It should be noted that, due to the moment when the support wheel 43 moves down to avoid the spiral tube and moves up to reset and contact the spiral tube, the change in the number of support points may cause a slight stress imbalance in the spiral tube. Although this imbalance has a negligible impact on the stability of the spiral tube, in order to better ensure the quality of the repair weld and prevent the possibility of accidents, this invention only activates the working state of mode three when it is necessary to repair welds on longer welds, so that when it is in the working states of mode one and mode two, the support wheel 43 can stably support the spiral tube.

[0059] To ensure smooth rotation of the support wheel 43 within the confined space at the bottom of the helical tube, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 5 and Figure 6 The number of teeth of the driven gear 441 is greater than that of the driving gear 442, so that the driving gear 442 and the driven gear 441 form a reduction gear pair. Through the first-stage reduction motion of the servo gear motor 443 and the second-stage reduction motion of the reduction gear pair, the servo gear motor 443 can stably drive the support wheel 43 supported by the helical tube to rotate stably and with high precision without the need to select a model with a larger output power.

[0060] Although the invention increases costs due to the use of precision components such as sensor 324, sensor 423, servo direct drive motor 45, servo geared motor 443, hydraulic cylinder 325, hydraulic cylinder 424, and electric slider 323, the combination of these components results in three modes: Mode 1 is suitable for stable repair welding of short welds; Mode 2 allows the support wheel 43 to actively avoid the weld, suitable for stable repair welding of medium-length welds; and Mode 3 relies on real-time monitoring by sensor 423 and rapid response by hydraulic cylinder 424 to control the dynamic lifting and lowering of the support wheel 43, achieving continuous high-quality repair welding of ultra-long welds. The working states of these three modes ensure high-precision tracking of the weld by the welding torch and stability of the weld pool, significantly improving the quality and efficiency of repair welding. The resulting economic benefits far exceed the initial cost investment, demonstrating outstanding practical value.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A helical tube repair welding apparatus comprising a welding assembly and a guide track arranged in tandem, characterised in that, Two axial limiting mechanisms arranged symmetrically left and right are arranged on the guide rail and slide left and right, and a plurality of rotating support mechanisms are arranged left and right in the middle of the guide rail; The axial limiting mechanism comprises a moving frame sliding on the guide rail, a plurality of abutting rollers are connected to the moving frame through telescopic assemblies, and the telescopic assemblies selectively extend the abutting rollers at the corresponding positions to abut and limit the end of the spiral pipe; The rotating support mechanism comprises an electric sliding table sliding on the guide rail, four support wheels are arranged circumferentially on the electric sliding table through an adjusting assembly, and a rotating assembly for adjusting the angle of the rotating support wheel is arranged on the electric sliding table; The rotating support mechanism comprises three working states of mode one, mode two and mode three, and the three working states are suitable for repairing welds of different lengths; in mode one, the electric sliding table is fixed and does not move; in mode two, the rotating assembly adjusts the rotating angle of the support wheel, and each electric sliding table moves synchronously in the spiral advancing direction of the weld of the spiral pipe, so that the support wheel avoids the weld; in mode three, the electric sliding table does not move, and the adjusting assembly retracts the corresponding support wheel to avoid the weld.

2. A spiral weld repair apparatus as defined in claim 1, wherein, The telescopic assembly comprises four square shells arranged circumferentially on the moving frame, a roller frame slidingly penetrates the center of the square shell, and the roller frame is rotatably connected with the abutting roller.

3. A spiral weld repair apparatus as defined in claim 2, wherein, One end of the square shell close to the moving frame is fixedly installed with an electric sliding block, the electric sliding block is slidably connected to the moving frame, and the four abutting rollers correspond to the end of the spiral pipe with different diameters through independent adjustment of the four electric sliding blocks.

4. A spiral weld repair apparatus as defined in claim 3, wherein, A sensor one is fixedly installed on the side of the square shell opposite to the rotating direction of the spiral pipe, a hydraulic cylinder one is fixedly installed on the electric sliding block, and the telescopic section of the hydraulic cylinder one is fixedly connected with the corresponding roller frame.

5. A spiral weld repair apparatus as defined in claim 1, wherein, The adjusting assembly comprises a rotating sleeve rotatably arranged on the electric sliding table and corresponding to the support wheel, a wheel frame slidingly penetrates the rotating sleeve, and the wheel frame is rotatably connected with the support wheel at the corresponding position.

6. A spiral weld repair apparatus as defined in claim 5, wherein, A sensor two corresponding to the support wheel is fixedly installed on the electric sliding table, and the sensor two is located on the side of the corresponding support wheel opposite to the rotating direction of the spiral pipe.

7. A spiral weld repair apparatus as defined in claim 6, wherein, Four hydraulic cylinders two respectively driving the corresponding wheel frames are fixedly installed on the electric sliding table, and when the sensor two sends a signal detecting the weld, the telescopic section of the hydraulic cylinder two at the corresponding position is retracted.

8. A spiral weld repair apparatus as defined in claim 5, wherein, The rotating assembly comprises a driven gear fixedly installed on the outside of the rotating sleeve, a driving gear meshing with the driven gear is rotatably arranged on the electric sliding table, and four servo reduction motors respectively driving the corresponding driving gears are fixedly installed on the electric sliding table.

9. A spiral weld repair apparatus as defined in claim 8, wherein, The number of teeth of the driven gear is greater than that of the driving gear, so that the driving gear and the driven gear form a reduction gear pair.

10. A spiral weld repair apparatus as defined in claim 5, wherein, A servo direct drive motor is fixedly installed on one side of the wheel frame, an output shaft of the servo direct drive motor is connected with the corresponding support wheel, and all the support wheels are driven by the servo direct drive motor to rotate synchronously at the same speed.

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