Wear-resistant pipe circumferential welding device

Abstract

This invention relates to the field of wear-resistant pipe welding, specifically to a wear-resistant pipe circumferential welding device. The device includes a base with a sliding support platform on its upper end. Clamps are symmetrically arranged at one end of the support platform. Each set of clamps includes an inner edge clamping member and an outer edge clamping member arranged opposite each other, enabling bidirectional end-face positioning and fixation of the curved wear-resistant pipe end. A double-end welding mechanism is located on the side of the support platform near the clamps. The double-end welding mechanism includes two coaxially rotating trays with radial clearance notches. Welding torches are mounted on the facing end faces of the trays. The two welding torches can be adjusted to an initial position with a 180° included angle, and rotate synchronously and in the same direction with the trays to complete the circumferential welding of the curved wear-resistant pipe. This device offers high clamping and positioning accuracy for curved wear-resistant pipes, effectively suppressing welding deformation, significantly improving welding quality and work efficiency, and solving the technical problems of clamping instability, low coaxiality accuracy, and large welding deformation in existing technologies for welding curved wear-resistant pipes.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant pipe welding, and more specifically to a wear-resistant pipe circumferential welding apparatus. Background Technology

[0002] Wear-resistant pipes are core components of material conveying systems in heavy industries such as thermal power, mining, metallurgy, and cement. They are mainly used to transport gas-solid and liquid-solid two-phase flow media containing high-hardness solid particles. Compared to ordinary straight pipes, curved wear-resistant pipes can adapt to compact and complex spatial layouts in factories and mines, enabling turning, diversion, and merging of the conveying pipeline. At the same time, the fluid turning points are the areas where media erosion and wear are most concentrated, requiring specialized wear-resistant structures to ensure long-term service performance. They are critical wear parts in conveying systems, used in large quantities and with high replacement frequency. With the increasing demands for continuous production in heavy industry, increasingly stringent requirements are being placed on the manufacturing precision, welding quality, and production efficiency of curved wear-resistant pipes. Pipe circumferential welding is the core process that determines the quality and service life of the finished product.

[0003] Currently, for welding operations on curved wear-resistant pipes, the clamping mechanisms of existing welding equipment are mostly designed for straight pipes, without independent design for curved wear-resistant pipes. Compared to ordinary straight pipes, the curved structure of curved wear-resistant pipes causes the inner arc side of the circumferential weld cross-section to shrink, resulting in a thicker wall, higher structural rigidity, and larger heat capacity. Conversely, the outer arc side has an extended metal cross-section with a relatively uniform wall thickness, lower structural rigidity, and smaller heat capacity. There is a significant difference in rigidity and heat capacity between the two. In existing circumferential welding equipment, the single-point moving heat source of single-head welding heats the circumference of the circumferential weld sequentially, causing the heating and cooling processes at different locations of the circumferential weld to be completely asynchronous, creating a temperature gradient. At this point, the weaker outer arc side is heated first and undergoes significant expansion, but is rigidly constrained by the surrounding cold metal, resulting in irreversible compressive plastic deformation. After cooling, the shrinkage is significantly greater than that of the stronger inner arc side. In severe cases, welding cold cracks may occur at the weld fusion line, directly leading to the scrapping of the pipe fitting.

[0004] In addition, curved wear-resistant pipes are mostly double-layer structures with a carbon steel matrix and a wear-resistant lining. The wear-resistant lining (alumina ceramic, silicon carbide ceramic, or high-chromium alloy, etc.) has a different coefficient of thermal expansion than the carbon steel matrix. The uneven heat input caused by single-point continuous heating in traditional welding equipment can generate thermal stress at the interface between the matrix and the lining that far exceeds the bonding strength, easily leading to lining debonding. Furthermore, ceramic linings themselves have limited thermal shock resistance; the localized instantaneous high temperature and extreme temperature difference from a single heat source can directly cause micro-cracks or even direct rupture of the lining. Even if the welding is successful, these latent defects will rapidly expand under subsequent two-phase flow erosion conditions containing high-hardness solid particles, leading to premature lining detachment, pipe wear-through, and leakage, significantly shortening the service life of the curved wear-resistant pipe. Based on this, the weld seam after welding of curved wear-resistant pipes easily becomes a weak point for erosion and leakage, significantly shortening the pipe's service life. Therefore, it is necessary to design a wear-resistant pipe circumferential welding device. Summary of the Invention

[0005] Therefore, it is necessary to provide a wear-resistant pipe circumferential welding device to address the problems of existing technologies.

[0006] To address the problems in the existing technology, the technical solution adopted by this invention is as follows:

[0007] A wear-resistant pipe circumferential welding device, comprising:

[0008] The base has a support platform that slides on its upper end. Clamps are symmetrically arranged at one end of the support platform. Each set of clamps includes an inner edge clamp and an outer edge clamp. The inner edge clamp and the outer edge clamp are arranged opposite to each other and can respectively abut against the inner and outer end faces of the outer wall of the curved wear-resistant pipe to be welded, so as to realize the bidirectional positioning and fixing of the curved wear-resistant pipe.

[0009] A double-end welding mechanism is set on the side of the support platform near the fixture. The double-end welding mechanism includes two coaxially rotating trays. The rotation axis of the two trays coincides with the central axis of the welding position of the curved wear-resistant pipe to be welded. Each tray has a radial clearance opening for the curved wear-resistant pipe to pass through. The clearance openings of the two rotating trays can be rotated to a coaxially aligned loading and unloading station.

[0010] Two welding torches are respectively installed on the opposite end faces of the two trays. The welding output end of the welding torch is arranged towards the rotation axis of the rotating tray. The two welding torches are adjusted to the initial welding position with an included angle of 180° by the tray and rotate synchronously with the tray to complete the circumferential welding of the curved wear-resistant pipe welding position.

[0011] Furthermore, the inner edge clamping member includes a first clamping cylinder whose fixed end is fixedly connected to the base, and the output end of the first clamping cylinder clamps the outer edge of the curved wear-resistant pipe.

[0012] The outer edge clamping component includes a second clamping cylinder disposed next to the first clamping cylinder, the output end of the second clamping cylinder clamping the inner edge of the curved wear-resistant pipe.

[0013] Furthermore, air compressor tanks for storing inert gas are respectively provided on both sides of the support platform, and a corner cylinder is provided on the side of the second clamping cylinder away from the first clamping cylinder.

[0014] The output end of the corner cylinder is equipped with a plug. After the corner cylinder is started, it drives the plug to be inserted into the end of the curved wear-resistant pipe. A flexible hose is installed through the middle of the plug, and the flexible hose is connected to the exhaust end of the air compressor tank.

[0015] Furthermore, each of the two pallets is equipped with a swing cylinder on its opposite end face. The rotating end of the swing cylinder is fixedly connected to the slide cylinder, and the moving end of the slide cylinder is fixedly connected to the fixed end of the welding torch.

[0016] Furthermore, a distance sensor is fixedly connected to the side of the output end of the slide cylinder, and the output end of the distance sensor points to the center of the tray.

[0017] Furthermore, two fork-shaped frames are fixedly connected to one end of the tray near the clamp, and each fork-shaped frame is rotatably equipped with a residual tooth ring in the middle, and the two residual tooth rings are respectively arranged coaxially with the two trays;

[0018] Each residual tooth ring is fixedly connected to a guide rod cylinder along the circumference. The output end of the guide rod cylinder is fixedly connected to the tray. On the side of the tray near the residual tooth ring, there are guide rods arranged at equal angles along the circumference. One end of the guide rod is fixedly connected to the tray, and the other end is slidably connected to the residual tooth ring.

[0019] Furthermore, grating sensors are installed on the sides of the two fork-shaped brackets that are close to each other, with the output end of the grating sensors facing the tray.

[0020] Furthermore, a motor is provided on the side of each fork-shaped frame, and a gear that is rotatably connected to the fork-shaped frame is provided on the side of the residual tooth ring, and the gear meshes with the residual tooth ring;

[0021] On the side of the gear away from the residual tooth ring, there is an idler tooth that is rotatably connected to the fork frame. The idler tooth meshes with the gear. On the side of the idler tooth closer to the motor, there is a belt synchronous pulley set. The idler tooth is connected to the output end of the motor through the belt synchronous pulley set.

[0022] Furthermore, annular guide grooves are provided on both sides of the residual tooth ring along the circumferential direction. Two guide plates are respectively provided in the annular guide grooves along the circumferential direction. One end of the guide plate is slidably connected to the guide groove, and the other end is fixedly connected to the fork-shaped frame.

[0023] Furthermore, the pallet has a locking groove along the circumference, and L-shaped plates are respectively provided on the side of the fork frame near the pallet. The end of the L-shaped plate near the pallet is slidably connected to the locking groove.

[0024] A locking plate is slidably connected to the side of the fork-shaped frame closest to the pallet, and the locking plate is fixedly connected to the end of the L-shaped plate away from the pallet.

[0025] The beneficial effects of this invention compared to the prior art are:

[0026] This solution employs a coaxial double-pallet structure with radial clearance notches, enabling interference-free loading and unloading of irregularly shaped, curved, wear-resistant pipes through notch alignment. It utilizes two synchronously rotating welding torches, adjustable to a 180° angle and aligned with the innermost and outermost edges of the curved pipe respectively. This creates a dual-heat-source synchronous welding system symmetrical about the pipe's bending neutral axis. During welding, the synchronous welding of the two torches offsets the welding deformation caused by the inherent rigidity asymmetry of the curved pipe, significantly reducing the risk of thermal damage to the lining. This allows for the completion of welding at critical, challenging points during the initial, most stable phase of the equipment, ensuring weld quality in the pipe's erosion-prone areas. It also eliminates the weld weakness caused by the simultaneous start and end of single-head welding, improving weld performance and extending the pipe's service life. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of an embodiment;

[0028] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0029] Figure 3 This is a three-dimensional structural schematic diagram from another angle of the embodiment;

[0030] Figure 4 yes Figure 3 Enlarged view of the structure at point B in the middle;

[0031] Figure 5 This is a top view of an embodiment;

[0032] Figure 6 yes Figure 5 Enlarged view of the structure at point C;

[0033] Figure 7 This is a three-dimensional structural diagram of the support platform and the fork-shaped frame in the embodiment;

[0034] Figure 8 yes Figure 7 Enlarged view of the structure at point D;

[0035] Figure 9 This is a three-dimensional structural diagram of the fork-shaped frame, tray, and residual tooth ring in the embodiment.

[0036] Figure 10 This is an exploded three-dimensional structural diagram of the fork-shaped frame, tray, and residual tooth ring in the embodiment;

[0037] Figure 11 This is a schematic diagram showing the distribution of the two welding torches in the embodiment.

[0038] The numbers on the map are:

[0039] 1. Base; 2. Support platform; 3. Clamp; 4. First clamping cylinder; 5. Second clamping cylinder; 6. Air compressor tank; 7. Plug; 8. Corner cylinder; 9. Hose; 10. Welding torch; 11. Swing cylinder; 12. Slide cylinder; 13. Distance sensor; 14. Grating sensor; 15. Fork frame; 16. L-shaped plate; 17. Clamping plate; 18. Guide rod cylinder; 19. Guide rod; 20. Tray; 21. Clearance notch; 22. Clamping groove; 23. Residual tooth ring; 24. Guide groove; 25. Guide plate; 26. Gear; 27. Inert tooth; 28. Belt synchronous pulley assembly; 29. ​​Motor. Detailed Implementation

[0040] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0041] refer to Figures 1 to 11 A wear-resistant pipe circumferential welding device, comprising:

[0042] The base 1 has a support platform 2 that is slidably provided on the upper end of the base 1. Clamps 3 are symmetrically arranged on one end of the support platform 2. Each set of clamps 3 includes an inner edge clamping member and an outer edge clamping member. The inner edge clamping member and the outer edge clamping member are arranged opposite to each other and can respectively abut against the inner edge end face and the outer edge end face of the outer wall of the curved wear-resistant pipe to be welded, so as to realize the bidirectional positioning and fixing of the curved wear-resistant pipe.

[0043] A double-end welding mechanism is provided on the side of the support platform 2 near the clamp 3. The double-end welding mechanism includes two coaxially rotating pallets 20. The rotation axis of the two pallets 20 coincides with the central axis of the welding position of the curved wear-resistant pipe to be welded. Each pallet 20 has a radial clearance notch 21 for the curved wear-resistant pipe to pass through. The clearance notches 21 of the two rotating pallets 20 can be rotated to a coaxially aligned loading and unloading position.

[0044] Two trays 20 are respectively equipped with welding guns 10 for welding on their opposite end faces. The welding output end of the welding gun 10 is arranged facing the rotation axis of the rotating tray 20. The two welding guns 10 are respectively adjusted to the initial welding position with an included angle of 180° by the tray 20, and rotate synchronously with the tray 20 in the same direction to complete the circumferential welding of the curved wear-resistant pipe welding position.

[0045] During operation, before the curved wear-resistant pipe to be welded is positioned, the support platform 2 slides along the upper end of the base 1 to adjust to the appropriate working position. Then, two sets of clamps 3 symmetrically arranged at one end of the support platform 2 simultaneously perform positioning actions. The inner and outer edge clamping parts of each set of clamps 3 are fed relative to each other, precisely fitting and abutting against the inner and outer end faces of the corresponding pipe ends of the curved wear-resistant pipe. Through the bidirectional end face clamping of the two pipe ends, the curved wear-resistant pipe is rigidly positioned and fixed. This positioning method is specifically designed for the irregular structure, non-linear axis, and center of gravity offset characteristics of curved pipes. Through symmetrical limiting on both sides, it accurately ensures that the central axis of the pipe welding position is completely coincident with the rotation axis of the two trays 20, completely solving the problems of easy instability and difficulty in ensuring coaxiality when clamping curved pipes, and providing a stable and accurate coaxiality reference for subsequent welding processes.

[0046] After clamping and positioning, the two coaxially arranged trays 20 are rotated to align their radial clearance notches 21 with the same axis, ensuring that the irregularly shaped curved wear-resistant pipe can be placed into the welding area without interference. After the curved wear-resistant pipe is in place, the trays 20 are reset to the initial welding position. Then, by rotating the two trays 20 circumferentially relative to each other, the two welding torches 10 are adjusted to the initial welding position with a relative angle of 180°. One welding torch 10 is aligned with the outermost edge of the curved pipe welding position, and the other welding torch 10 is aligned with the innermost edge of the curved pipe welding position. At the same time, the welding output ends of both welding torches 10 are arranged facing the rotation axis of the trays 20, so that the welding torches 10 lock the optimal welding spacing and incident angle at the most difficult welding point, laying a solid foundation for synchronous circumferential welding.

[0047] After the welding operation begins, the two trays 20 rotate synchronously and in the same direction around the axis of rotation at the same speed, driving the two welding torches 10, which are at a 180° angle, to move synchronously around the welding position of the pipe, completing the full circumferential welding of the welding position. The synchronous operation of the two welding torches 10 forms a circumferentially symmetrically distributed dual welding heat source, which makes the circumferential heating and cooling process of the welding position of the inherently asymmetrical curved pipe completely synchronized, greatly reducing the risk of welding thermal stress and pipe deformation, and avoiding debonding and cracking of the wear-resistant layer due to uneven heating. At the same time, the synchronous operation of the two welding torches 10 avoids the weak weld defects caused by the same arc start and end point of single-head welding, realizing high-quality and high-efficiency circumferential welding operation of curved wear-resistant pipes.

[0048] To further elaborate on the specific structure of fixture 3, the following features were also provided:

[0049] like Figure 3 and Figure 4 As shown, the inner edge clamping member includes a first clamping cylinder 4 whose fixed end is fixedly connected to the base 1, and the output end of the first clamping cylinder 4 clamps the outer edge of the curved wear-resistant pipe.

[0050] The outer edge clamping component includes a second clamping cylinder 5 disposed beside the first clamping cylinder 4, the output end of the second clamping cylinder 5 clamping the inner edge of the curved wear-resistant pipe.

[0051] When positioning and clamping the wear-resistant pipe, the first clamping cylinder 4 and the second clamping cylinder 5 are started synchronously. The output end of the first clamping cylinder 4 feeds radially, causing the outer edge clamping part to accurately abut against the outer edge end face of the pipe. The output end of the second clamping cylinder 5 feeds radially in the opposite direction, causing the inner edge clamping part to accurately abut against the inner edge end face of the pipe. The synchronous feeding of the first clamping cylinder 4 and the second clamping cylinder 5 achieves bidirectional rigid positioning of the curved wear-resistant pipe, ensuring that the curved wear-resistant pipe has no axial or radial displacement during the clamping process, while completely avoiding the squeezing damage to the wear-resistant layer of the inner and outer walls of the pipe.

[0052] To ensure a sufficient supply of inert gas to the curved wear-resistant pipes during the welding process, the following features are specifically included:

[0053] like Figure 1 and Figure 2 As shown, air compressor tanks 6 for storing inert gas are respectively provided on both sides of the support platform 2, and a corner cylinder 8 is provided on the side of the second clamping cylinder 5 away from the first clamping cylinder 4.

[0054] The output end of the corner cylinder 8 is equipped with a plug 7. After the corner cylinder 8 is started, it drives the plug 7 to be inserted into the end of the curved wear-resistant pipe. A hose 9 is installed through the middle of the plug 7, and the hose 9 is connected to the exhaust end of the air compressor tank 6.

[0055] After the pipe is clamped and positioned, the corner cylinder 8 is activated. First, the rotational action drives the plug 7 to align with the center of the pipe opening. Then, the axial feeding action tightly inserts the plug 7 into the pipe end opening, achieving a seal. Throughout the welding process, the air pressure tank 6 continuously outputs inert protective gas. The gas is introduced into the pipe through the hose 9 and the plug 7, forming a stable positive pressure inert atmosphere in the pipe cavity, completely isolating the air and preventing oxidation and debonding of the weld root and the wear-resistant layer of the pipe inner wall under the high welding temperature.

[0056] In order to adjust the relative position and relative angle of the welding torch 10, the following features are specifically set:

[0057] like Figure 6 and Figure 9As shown, two trays 20 are respectively equipped with swing cylinders 11 on their facing end faces. The rotating end of the swing cylinder 11 is fixedly connected to the slide cylinder 12, and the moving end of the slide cylinder 12 is fixedly connected to the fixed end of the welding torch 10. During the pre-adjustment of the welding position, the swing cylinder 11 is activated, and the circumferential angle of the welding torch 10 is adjusted by the circumferential rotation of the rotating end, precisely controlling the relative circumferential angle between the two welding torches 10 to 180°. At the same time, it can adapt to the welding point posture adjustment of pipes with different curvatures. The slide cylinder 12 is activated, and the radial distance between the welding torch 10 and the pipe welding position is adjusted by the radial feed of the moving end, so that the welding torch 10 is always in the optimal welding defocus range, adapting to the welding requirements of pipes with different diameters, and ensuring uniform and stable penetration depth throughout the entire circumferential welding process.

[0058] To facilitate maintaining the optimal welding distance between the welding torch 10 and the curved wear-resistant pipe, the following features are specifically designed:

[0059] like Figure 10 As shown, a distance sensor 13 is fixedly connected to the side of the output end of the slide cylinder 12, and the output end of the distance sensor 13 points to the center of the tray 20. During the process of adjusting the radial position of the welding torch 10 by the slide cylinder 12, the distance sensor 13 collects the distance data between itself and the outer wall of the pipe in real time and feeds the data back to the device control system. The control system precisely controls the feed stroke of the slide cylinder 12 according to the preset welding spacing parameters, so as to realize the control of the distance between the welding torch 10 and the welding position of the pipe, ensure the accuracy of the posture of the two welding torches 10 during the whole circumference welding process, and eliminate defects such as uneven penetration and incomplete penetration caused by spacing fluctuations.

[0060] To enable relative movement of the two trays 20, so that the two welding torches 10 do not collide during loading and unloading, and so that the welding torches 10 can be more accurately aligned with the weld seam, the following features are specifically provided:

[0061] like Figure 3 , Figure 9 and Figure 10 As shown, two fork-shaped frames 15 are fixedly connected to one end of the platform 2 near the clamp 3. Each fork-shaped frame 15 has a residual tooth ring 23 rotatably arranged in the middle part. The two residual tooth rings 23 are respectively arranged coaxially with the two trays 20.

[0062] Each residual tooth ring 23 is fixedly connected to a guide rod cylinder 18 along the circumferential direction. The output end of the guide rod cylinder 18 is fixedly connected to the tray 20. On the side of the tray 20 near the residual tooth ring 23, there are guide rods 19 arranged at equal angles along the circumferential direction. One end of the guide rod 19 is fixedly connected to the tray 20, and the other end is slidably connected to the residual tooth ring 23.

[0063] During the loading, unloading, and pre-adjustment stages, the guide rod cylinder 18 drives the tray 20 to reciprocate along the axial direction, thereby adjusting the axial relative position of the two trays 20. This ensures that the axial distance between the two trays 20 increases during loading and unloading, preventing the two welding guns 10 from colliding. During pre-adjustment, the axial relative position between the tray 20 and the weld can be precisely adjusted, allowing the welding gun 10 to be precisely aligned with the welding position.

[0064] During the movement of the pallet 20, the arrayed guide rods 19 slide along the guide holes of the residual tooth ring 23 to ensure the coaxiality and stability of the axial movement of the pallet 20 and to prevent the pallet 20 from radially swaying.

[0065] To detect the relative movement of the two trays 20, the following features were specifically designed:

[0066] like Figure 3 As shown, a grating sensor 14 is provided on one side of the upper end of the two fork-shaped brackets 15 that are close to each other, and the output end of the grating sensor 14 faces the tray 20.

[0067] During the axial movement of the guide rod cylinder 18 and the tray 20, the grating sensor 14 collects the axial relative position data of the two trays 20 in real time and feeds the data back to the control system. The control system controls the feed stroke of the guide rod cylinder 18 based on the collected data to achieve closed-loop precise control of the axial movement distance of the tray 20, ensuring the axial position accuracy of the two trays 20. At the same time, it can trigger limit protection when the tray 20 moves to the limit position to avoid collision damage to the mechanism caused by overtravel of the tray 20.

[0068] In order to drive the residual tooth ring 23 to rotate so that the two welding torches 10 can rotate in the same direction, the following features are also provided:

[0069] like Figure 7 , Figure 8 and Figure 9 As shown, a motor 29 is provided on the side of each fork frame 15, and a gear 26 that is rotatably connected to the fork frame 15 is provided on the side of the residual tooth ring 23. The gear 26 meshes with the residual tooth ring 23.

[0070] On the side of gear 26 away from residual tooth ring 23, there is an idler tooth 27 that is rotatably connected to fork frame 15. The idler tooth 27 meshes with gear 26. On the side of idler tooth 27 near motor 29, there is a belt synchronous pulley set 28. The idler tooth 27 is connected to the output end of motor 29 through belt synchronous pulley set 28.

[0071] During welding operations, the motor 29 starts, and the power at the output end is transmitted to the idler tooth 27 through the belt synchronous pulley group 28. The idler tooth 27 drives the gear 26 to rotate through meshing transmission. The gear 26 further drives the residual tooth ring 23 to rotate around the axis through meshing transmission. The residual tooth ring 23 drives the tray 20 to rotate synchronously through the guide rod cylinder 18 and the guide rod 19, ultimately realizing the synchronous and unidirectional rotation of the welding gun 10 on the two trays 20.

[0072] The two motors 29 are independently controlled, enabling the individual residual tooth ring 23 to rotate independently, ensuring that both welding guns 10 can be moved to the preset position during loading and unloading.

[0073] In order to limit the rotation of the residual tooth ring 23, the following features are specifically provided:

[0074] like Figure 9 and Figure 10 As shown, the residual tooth ring 23 has annular guide grooves 24 on both sides along the circumferential direction. Two guide plates 25 are respectively provided in the annular guide grooves 24 along the circumferential direction. One end of the guide plate 25 is slidably connected to the guide groove 24, and the other end is fixedly connected to the fork-shaped frame 15.

[0075] During the rotation of the residual tooth ring 23, the guide plate 25 fixed to the fork frame 15 is always embedded in the annular guide groove 24 on both sides of the residual tooth ring 23 and slides relative to each other in the circumferential direction along the guide groove 24. Through the cooperation between the guide plate 25 and the annular guide groove 24, the rotation of the residual tooth ring 23 is limited in both the radial and axial directions, ensuring that the residual tooth ring 23 always remains coaxial with the tray 20 during the rotation, avoiding radial runout and axial movement of the residual tooth ring 23, and improving the transmission stability and welding trajectory accuracy.

[0076] To achieve rotation and movement limits for the pallet 20, the following features are specifically designed:

[0077] like Figure 9 and Figure 10 As shown, the pallet 20 has a locking groove 22 along the circumferential direction, and the fork-shaped frame 15 is provided with an L-shaped plate 16 on one side near the pallet 20. The end of the L-shaped plate 16 near the pallet 20 is slidably connected to the locking groove 22.

[0078] A locking plate 17 is slidably connected to the side of the fork-shaped frame 15 near the pallet 20, and the locking plate 17 is fixedly connected to the end of the L-shaped plate 16 away from the pallet 20.

[0079] During the rotation of pallet 20, the end of L-shaped plate 16 is always embedded in the annular engaging groove 22 of pallet 20 and slides circumferentially relative to each other along the engaging groove 22 to radially limit the rotation of pallet 20 and prevent radial sway during the rotation of pallet 20. When pallet 20 moves axially, L-shaped plate 16 drives engaging plate 17 to slide synchronously axially along fork frame 15 to ensure that the limiting mechanism keeps in cooperation with pallet 20 throughout the process. At the same time, the locking action of engaging plate 17 can fix the axial position of pallet 20, prevent the pallet 20 from moving axially during the welding process, and ensure the stability of the welding trajectory.

[0080] After the device is started, it enters the preparation stage. The support platform 2 first slides along the guide rail at the upper end of the base 1 to the preset loading and unloading position. The guide rod cylinders 18 of the two pallets 20 are activated, driving the pallets 20 to separate axially to a safe distance. At the same time, the two pallets 20 rotate circumferentially, so that the radial clearance notch 21 is aligned with the loading and unloading position, reserving a non-interference space for the insertion of the curved wear-resistant pipe. After the pipe is inserted, the support platform 2 slides to the welding position. The first clamping cylinder 4 and the second clamping cylinder 5 accurately abut against the outer edge and inner edge of the pipe on both sides, respectively, to complete the bidirectional rigid positioning of the pipe and ensure that the central axis of the pipe welding position is completely coaxial with the rotation axis of the pallet 20.

[0081] After clamping, the corner cylinder 8 is activated, which drives the plug 7 to rotate and align with and seal the pipe openings at both ends of the pipe. The air pressure tank 6 continuously introduces inert protective gas into the pipe through the hose 9, forming a positive pressure inert atmosphere in the pipe cavity to provide root protection for welding.

[0082] Subsequently, the guide rod cylinder 18 drives the tray 20 to move axially, and the grating sensor 14 collects the position data of the tray 20 in real time to accurately control the axial relative position of the tray 20 and the weld seam, so that the welding torch 10 is aligned with the welding position. Then, the two sets of motors 29 start respectively, and the power is transmitted to the residual tooth ring 23 through the belt synchronous pulley group 28, idler tooth 27, and gear 26, which drives the two residual tooth rings 23 to rotate synchronously and in the same direction at the same speed. Then, the guide rod cylinder 18 and the guide rod 19 drive the tray 20 to rotate synchronously, so that the relative angle between the two welding torches 10 is 180°. Then, the swing cylinder 11 starts to further align the two welding torches 10 with the innermost and outermost edges of the pipe welding position, respectively. Finally, the distance sensor 13 provides real-time feedback of the distance data, and the slide cylinder 12 accurately adjusts the radial position of the welding torch 10 to lock the optimal welding distance and incident angle.

[0083] After the welding operation is initiated, the two sets of motors 29 are restarted, causing the two welding torches 10 to move synchronously around the welding position on the pipe, completing the full circumferential welding. During the welding process, the guide plate 25 and the annular guide groove 24 limit the residual tooth ring 23 throughout its entire length, and the L-shaped plate 16 and the locking groove 22 limit the tray 20 throughout its entire length, ensuring no swaying during rotation. The two welding torches 10 form a dual heat source symmetrical about the neutral axis of the pipe bend, ensuring that the circumferential heating and cooling of the pipe are completely synchronized, significantly reducing the risk of welding thermal stress and deformation. At the same time, it completes the welding of high-difficulty points in the initial stage when the equipment is in the most stable state, ensuring uniform performance of the weld throughout its entire circumference. After welding is completed, the device is reset, completing the entire welding operation process.

[0084] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A wear-resistant pipe circumferential welding device, characterized in that, include: The base (1) has a support platform (2) slidably arranged on the upper end of the base (1). The support platform (2) has clamps (3) symmetrically arranged on one end. Each set of clamps (3) includes an inner edge clamping member and an outer edge clamping member. The inner edge clamping member and the outer edge clamping member are arranged opposite to each other and can respectively abut against the inner edge end face and the outer edge end face of the outer wall of the curved wear-resistant pipe to be welded, so as to realize the bidirectional positioning and fixing of the curved wear-resistant pipe. A double-end welding mechanism is provided on the side of the support platform (2) near the clamp (3). The double-end welding mechanism includes two coaxially rotating pallets (20). The rotation axis of the two pallets (20) coincides with the central axis of the welding position of the curved wear-resistant pipe to be welded. Each pallet (20) has a radial clearance notch (21) for the curved wear-resistant pipe to pass through. The clearance notch (21) of the two rotating pallets (20) can be rotated to the coaxially aligned loading and unloading position. Two trays (20) are respectively equipped with welding guns (10) for welding on their opposite end faces. The welding output end of the welding gun (10) is arranged facing the rotation axis of the rotating tray (20). The two welding guns (10) are respectively adjusted to the initial welding position with an included angle of 180° through the tray (20) and rotate synchronously with the tray (20) in the same direction to complete the circumferential welding of the curved wear-resistant pipe welding position.

2. The wear-resistant pipe circumferential welding device according to claim 1, characterized in that, The inner edge clamping component includes a first clamping cylinder (4) whose fixed end is fixedly connected to the base (1), and the output end of the first clamping cylinder (4) clamps the outer edge of the curved wear-resistant pipe; The outer edge clamping component includes a second clamping cylinder (5) located beside the first clamping cylinder (4), the output end of which clamps the inner edge of the curved wear-resistant pipe.

3. The wear-resistant pipe circumferential welding device according to claim 2, characterized in that, On both sides of the support platform (2), there are air pressure tanks (6) for storing inert gas, and on the side of the second clamping cylinder (5) away from the first clamping cylinder (4), there is a corner cylinder (8). The output end of the corner cylinder (8) is provided with a plug (7). After the corner cylinder (8) is started, it drives the plug (7) to be inserted into the end of the curved wear-resistant pipe. A hose (9) is provided through the middle of the plug (7). The hose (9) is connected to the exhaust end of the air compressor tank (6).

4. The wear-resistant pipe circumferential welding device according to claim 1, characterized in that, Two trays (20) are respectively provided with swing cylinders (11) on their opposite end faces. The rotating end of the swing cylinder (11) is fixedly connected to the slide cylinder (12), and the moving end of the slide cylinder (12) is fixedly connected to the fixed end of the welding gun (10).

5. The wear-resistant pipe circumferential welding device according to claim 4, characterized in that, A distance sensor (13) is fixedly connected to the side of the output end of the slide cylinder (12), and the output end of the distance sensor (13) points to the center of the tray (20).

6. The wear-resistant pipe circumferential welding device according to claim 4, characterized in that, Two fork-shaped frames (15) are fixedly connected to one end of the platform (2) near the clamp (3). Each fork-shaped frame (15) has a residual tooth ring (23) rotatably arranged in the middle. The two residual tooth rings (23) are respectively arranged coaxially with the two trays (20). Each residual tooth ring (23) is fixedly connected to a guide rod cylinder (18) along the circumferential direction. The output end of the guide rod cylinder (18) is fixedly connected to the tray (20). The tray (20) has guide rods (19) arranged at equal angles along the circumferential direction on the side near the residual tooth ring (23). One end of the guide rod (19) is fixedly connected to the tray (20), and the other end is slidably connected to the residual tooth ring (23).

7. The wear-resistant pipe circumferential welding device according to claim 6, characterized in that, A grating sensor (14) is provided on one side of the upper end of the two fork-shaped brackets (15) that are close to each other, and the output end of the grating sensor (14) faces the tray (20).

8. The wear-resistant pipe circumferential welding device according to claim 6, characterized in that, Each fork frame (15) is provided with a motor (29) on its side, and a gear (26) is provided on the side of the residual tooth ring (23) to be rotatably connected to the fork frame (15). The gear (26) meshes with the residual tooth ring (23). On the side of the gear (26) away from the residual tooth ring (23), there is an idler tooth (27) that is rotatably connected to the fork frame (15). The idler tooth (27) meshes with the gear (26). On the side of the idler tooth (27) close to the motor (29), there is a belt synchronous pulley set (28). The idler tooth (27) is connected to the output end of the motor (29) through the belt synchronous pulley set (28).

9. The wear-resistant pipe circumferential welding device according to claim 8, characterized in that, The residual tooth ring (23) has annular guide grooves (24) on both sides along the circumferential direction. Two guide plates (25) are respectively provided in the annular guide grooves (24) along the circumferential direction. One end of the guide plate (25) is slidably connected to the guide groove (24), and the other end is fixedly connected to the fork frame (15).

10. The wear-resistant pipe circumferential welding device according to claim 9, characterized in that, The pallet (20) has a locking groove (22) along the circumferential direction. The fork frame (15) is provided with an L-shaped plate (16) on the side near the pallet (20). The end of the L-shaped plate (16) near the pallet (20) is slidably connected to the locking groove (22). The fork-shaped frame (15) is slidably connected to a locking plate (17) on the side near the pallet (20), and the locking plate (17) is fixedly connected to the end of the L-shaped plate (16) away from the pallet (20).

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