Inner supporting type root welding device for circular seam welding of anti-corrosion pipeline

Abstract

The invention discloses an inner supporting type root welding device for circular seam welding of an anti-corrosion pipeline, relates to the technical field of pipeline welding, and aims to solve the technical problems that in a current inner supporting type root welding device, single-track welding is often adopted, the welding seam contact area is small, and the welding seam quality is poor. Through the design of the inner supporting assembly, the opening structure, the supporting assemblies and the welding assembly, two annular channels are formed at the tail ends of the supporting assemblies distributed in an umbrella rib mode, it is guaranteed that the inner wall of a workpiece is evenly stressed through mirror image supporting, and a motion reference is provided for the welding assembly; when the welding assembly rotates, the movable connecting structure moves along the annular channel, the movable connecting structure forms a wavy track by means of the shape of the channel, and then the welding head is driven to form an enhanced welding seam. According to the design, the welding assembly depends on a wave track formed by the annular channel, the welding seam contact area can be increased during welding of the inner wall of a workpiece, and stress is dispersed.

Description

Technical Field

[0001] The present invention relates to the field of pipeline welding technology, and more specifically, to an internal support root welding device for circumferential welding of corrosion-resistant pipelines. Background Technology

[0002] Corrosion-resistant pipelines are widely used in the oil and gas, chemical, and wastewater treatment industries. Their inner walls must withstand long-term erosion from high pressure, high temperature, and highly corrosive media. Circumferential welding, as a core component of pipeline connections, must not only ensure weld strength but also the integrity of the anti-corrosion layer to prevent coating failure due to welding heat. In corrosion-resistant pipeline engineering, arc welding is the core technology for achieving circumferential and longitudinal seam connections. Its welding quality directly determines the pipeline's sealing performance, corrosion resistance, and long-term service life. When processing large-scale corrosion-resistant pipelines with high flow rates, an internal support root welding device is required for internal support and welding.

[0003] However, existing internal wall welding devices often only achieve single-trajectory welding in straight lines or ordinary rings. This results in a small weld contact area, significant stress concentration, and a susceptibility to quality defects such as weld misalignment and incomplete welds. Consequently, the weld is prone to cracking under external forces, severely impacting welding quality and the mechanical properties of the workpiece. Therefore, we propose an internally supported root welding device for circumferential welding of corrosion-resistant pipelines. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide an internal support type root welding device for circumferential welding of anti-corrosion pipelines, so as to solve the technical problems that current internal support type root welding devices often use single trajectory welding, resulting in small weld contact area and poor weld quality.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an internally supported root welding device for circumferential welding of anti-corrosion pipelines, comprising an internally supported component, a support structure, a support component, and a welding component; The inner support component is used to drive the opening structure. The two opening structures are located at both ends of the inner support component and together form two mirror-arranged umbrella rib support structures. Several ends of the umbrella rib support structure are respectively connected to several support components, and the two sets of support components on the two umbrella rib support structures form two annular channels. The welding assembly is rotatably connected to the middle of the two umbrella-rib support structures. When the welding assembly rotates, the movable connecting structure passes through the annular channel, causing the welding assembly to have a wave-shaped motion trajectory, which enhances the welding quality of the circumferential seam when the anti-corrosion pipe is connected. The annular channel includes a first annular track and a second annular track; when the movable connecting structure passes through the first annular track, the welding assembly moves in a first wave-shaped trajectory in the transverse direction to enhance the width of the weld; when the movable connecting structure passes through the second annular track, the welding assembly moves in a second wave-shaped trajectory in the longitudinal direction to enhance the depth of the weld.

[0006] Preferably, the inner support assembly further includes elastic telescopic rods and auxiliary wheels. Two sets of elastic telescopic rods are respectively disposed at both ends of the inner support assembly, and several elastic telescopic rods of each set are equidistantly arranged in a ring on the inner support assembly. Several auxiliary wheels are installed at the ends of several elastic telescopic rods.

[0007] Preferably, the support assembly includes a rod positioning structure, a first welding drive structure, a second welding drive structure, and a support plate; Several rod positioning structures are respectively provided at several ends of two umbrella rib support structures, several first welding drive structures are provided on several rod positioning structures of one umbrella rib support structure, several second welding drive structures are provided on several rod positioning structures of another umbrella rib support structure, and several support plates are provided on several first welding drive structures and several second welding drive structures.

[0008] Preferably, the pole positioning structure includes a movable pole and a telescopic pole; the movable pole is rotatably connected to the end of the umbrella rib support structure, the telescopic pole is fixedly connected to the umbrella rib support structure, and a plurality of the telescopic poles are installed on a plurality of movable poles.

[0009] Preferably, the first welding drive structure includes a mounting bracket, a first track, a first ejector block, and a first telescopic drive; A plurality of mounting brackets are connected to a plurality of movable rods with a rod positioning structure. A plurality of first tracks are mounted on a plurality of mounting brackets. The plurality of first tracks form an intermittent first annular track. One side of the first track is provided as an opening. A plurality of first ejector blocks are slidably connected to one side of the first track, and the first ejector blocks slide in the horizontal direction. A plurality of first ejector blocks are mounted on a plurality of first telescopic drives. A plurality of first telescopic drives are all mounted on the mounting brackets.

[0010] Preferably, the second welding drive structure includes a fixed frame, a second track, a second ejector block, and a second telescopic drive; Several fixed frames are connected to several movable rods of another rod positioning structure. Several second tracks are installed on several fixed frames. Several second tracks form an intermittent second ring track. One side of the second track is provided as an opening. Several second ejector blocks are slidably connected to the top and bottom of the second track, and the second ejector blocks slide in the vertical direction. Several second ejector blocks are installed on several second telescopic drives. Several second telescopic drives are all installed on fixed frames.

[0011] Preferably, the welding assembly includes a drive structure, a movable connection structure, and an arc welding device; The drive structure is connected to the middle of the two umbrella-rib support structures, the movable connection structure is located on the drive structure, and the arc welding equipment is located on the movable connection structure.

[0012] Preferably, the drive structure includes a fixed gear ring, a gear, a first rotary drive, a third telescopic drive, a mounting column, and a fourth telescopic drive; The fixed gear ring is rotatably connected to the middle of the two umbrella rib support structures. The gear is meshed with the inner side of the fixed gear ring. The output end of the first rotary drive is connected to the gear, and the first rotary drive is installed in the middle of the two umbrella rib support structures. The third telescopic drive is installed on the fixed gear ring. The mounting post is installed on the output end of the third telescopic drive, and the mounting post is slidably connected to the fixed gear ring. The fourth telescopic drive is installed inside the mounting post, and the movable connection structure is provided on the fourth telescopic drive.

[0013] Preferably, the movable connection structure includes a first connecting block, a groove plate, a first elastic element, a second connecting block, a groove column, and a second elastic element; The first connecting block is connected to an arc welding device and is horizontally slidably connected to the groove plate. The first connecting block and the groove plate are connected by a first elastic element. The second connecting block is connected to the groove plate and is vertically slidably connected to the groove column. The second connecting block and the groove column are connected by a second elastic element.

[0014] Preferably, the movable connection structure further includes a lever, a fifth telescopic drive, and a lever head; The lever is mounted on the first connecting block, and the two fifth telescopic drives are respectively mounted on both sides of the lever. The output end of the fifth telescopic drive is equipped with a lever head, and the lever heads at both ends are slidably connected to the first annular track and the second annular track, respectively. The lever head is connected to the first annular track and the first ejector block, so that the lever head intermittently reciprocates in the horizontal direction and forms a wave-like trajectory. The lever head, in conjunction with the second annular track and the second ejector block, causes the lever head to reciprocate intermittently in the vertical direction, forming a wave-like trajectory.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the design of an internal support component, a spreading structure, a supporting component, and a welding component, uses an internal support component to drive the spreading structures at both ends to form a mirror-symmetrical umbrella-rib support structure. The umbrella-rib distributed supporting components form two annular channels at the ends, ensuring uniform force on the inner wall of the workpiece through mirror support and providing a motion reference for the welding component. The welding component is rotatably connected to the middle of the umbrella-rib support structure. During rotation, its movable connecting structure moves along the annular channels. The channel shape allows the movable connecting structure to naturally form a wave-like trajectory, thereby driving the welding head to form a reinforced weld. The design of this invention, relying on the wave-like trajectory formed by the annular channels, increases the weld contact area and disperses stress during welding of the inner wall of the workpiece.

[0016] 2. This invention utilizes the coordinated design of the rod positioning structure and the driving structure in the support assembly. The rod positioning structures are respectively located at the ends of the support rods, enabling precise radial and circumferential positioning of the support plates to adapt to the inner wall curvature of workpieces with different inner diameters. Six first welding driving structures on one side and six second welding driving structures on the other side drive the corresponding support plates to move, ensuring a tight fit to the inner wall of the workpiece as adjusted by the rod positioning structure, while also strengthening local support. The twelve sets of support plates, with the adjustment of the movable rod angle and the adaptation of the telescopic rod length, open synchronously with the umbrella rib structure, forming a fully fitted support surface. This invention, through the coordinated design of the rod positioning structure and the driving structure, ensures that the support structure and the inner wall of the pipe remain straight at all times, resulting in uniform circumferential force on the pipe, providing a stable reference for the central welding assembly, and improving the accuracy and reliability of the inner wall welding.

[0017] 3. This invention, through the design of the driving structure and movable connection structure in the welding assembly, allows the welding assembly to rotate circumferentially along the axis of the linkage frame, adapting to the welding of circumferential seams; the mounting column and end structure can extend and retract radially, adjusting the distance between the welding equipment and the inner wall of the workpiece; the fourth telescopic driving connection movable connection structure within the mounting column can further fine-tune the axial position of the arc welding equipment, and, in conjunction with the flexible rotation of the movable connection structure, ensures that the welding head is precisely aligned with the welding point. This invention, through the design of the driving structure and movable connection structure in the welding assembly, allows the arc welding equipment to move flexibly between the two umbrella-shaped support structures, adapting to the welding needs of cylindrical workpieces with different inner diameters and weld positions. Combined with the stable internal support of the support assembly, omnidirectional welding can be completed without multiple clamping operations, significantly improving welding efficiency and accuracy.

[0018] 4. This invention utilizes the sliding engagement of a first annular track and a second annular track with a lever head. Six first tracks form an intermittent first annular track, and six second tracks form an intermittent second annular track. An opening on one side provides space for the lever head to move. The lever head extends via a fifth telescopic drive and slides onto the two tracks. When the first welding drive structure operates, the tracks define the horizontal annular movement trajectory of the lever head, preventing deviation. This invention, through the cooperation of the first and second annular tracks and the lever head, collectively establishes an annular movement reference for the inner wall of the annular pipe in the arc welding equipment, ensuring precise and controllable welding trajectory along the pipe's annular shape, providing a foundation for the subsequent formation of a uniform weld.

[0019] 5. This invention utilizes the linkage between the ejector block and the lever head on a ring track. Through the cooperation of the first ejector block and the lever head, when it is necessary to enhance the sealing of the butt joint of the inner wall of the pipeline, the ejector block is controlled to form a small-amplitude wavy weld; when dealing with scenarios requiring high structural strength, a large-amplitude wavy weld is adopted; it can also form an asymmetrical wavy weld biased to one side, adapting to welding scenarios where there are irregular structures such as local protrusions or steps on the inner wall of the pipeline; the lever head and the second ejector block cooperate to drive the arc welding equipment to form a wavy weld. Compared with the traditional straight weld, the wavy weld significantly increases the actual contact area with the inner wall of the pipeline, avoiding the problem of stress concentration in a single linear area in the straight weld. Furthermore, the wavy movement of the lever head will cause the welding head to generate periodic small-amplitude oscillations, promoting full stirring of the molten pool metal, reducing welding defects such as bubbles and slag inclusions. At the peak of the wave trajectory, the welding head stays in the area for a longer time, forming a penetration enhancement zone. In the welding of thick-walled pipelines, a layered reinforcement effect can be achieved, making the weld and the pipeline base material more firmly bonded and improving the overall density of the weld. This invention optimizes the welding effect of pipe circumferential joints, enhances welding strength, and adapts to more diversified welding needs by designing different ejector block structures on both sides. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the fixing rod of the present invention; Figure 3 This is a schematic diagram of the structure of the tie rod in this invention; Figure 4 This is a schematic diagram of the structure at the fixing rod of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention. Figure 6 This is a schematic diagram of the rod positioning structure and the first welding drive structure of the present invention; Figure 7 This is a schematic diagram of the first welding drive structure of the present invention; Figure 8This is a schematic diagram of the rod positioning structure and the second welding drive structure of the present invention; Figure 9 This is a schematic diagram of the second welding drive structure of the present invention; Figure 10 This is a top view schematic diagram of the first welding drive structure of the present invention; Figure 11 This is a top view schematic diagram of the second welding drive structure of the present invention; Figure 12 This is a schematic diagram of one side of the welding assembly of the present invention; Figure 13 This is a schematic diagram of the structure of the other side of the welding assembly of the present invention; Figure 14 This is a cross-sectional view of the welding assembly of the present invention; Figure 15 For the present invention Figure 14 Enlarged view of point A in the middle; Figure 16 This is a schematic diagram of the structure of the present invention, showing the lever head extending to the first welding drive structure; Figure 17 This is a schematic diagram of the structure of the present invention, showing the lever head extending to the second welding drive structure.

[0021] Explanation of the labels in the diagram: 1. Internal support components; 2. Spreading structure; 3. Support components; 4. Welding components; 101. Fixed rod; 102. Fixed ring; 103. Slide groove; 104. Tie rod; 105. Flexible telescopic rod; 106. Auxiliary wheel; 201. Slider; 202. Movable ring; 203. Linkage frame; 204. Linkage rod; 205. Support rod; 301. Rod positioning structure; 302. First welding drive structure; 303. Second welding drive structure; 304. Support plate; 3011. Movable pole; 3012. Telescopic pole; 3021, Mounting bracket; 3022, First track; 3023, First ejector block; 3024, First telescopic drive; 3031, Fixing frame; 3032, Second track; 3033, Second ejector block; 3034, Second telescopic drive; 401. Drive structure; 402. Movable connection structure; 403. Arc welding equipment; 4011. Fixed gear ring; 4012. Gear; 4013. First rotary drive; 4014. Third telescopic drive; 4015. Mounting post; 4016. Fourth telescopic drive; 4021, First connecting block; 4022, Slot plate; 4023, First elastic element; 4024, Second connecting block; 4025, Slot column; 4026, Second elastic element; 4027, Toggle lever; 4028, Fifth telescopic drive; 4029, Toggle lever head. Detailed Implementation

[0022] Examples, such as Figures 1 to 11 As shown, the present invention relates to an internally supported root welding device for circumferential welding of anti-corrosion pipelines, comprising an internally supported component 1, a supporting structure 2, a support component 3, and a welding component 4.

[0023] The inner support component 1 is used to drive the opening structure 2. The two opening structures 2 are located at both ends of the inner support component 1 and together form two mirror-image umbrella rib support structures. The six ends of the umbrella rib support structures are respectively connected to six support components 3, and the two sets of support components 3 on the two umbrella rib support structures form two annular channels. The welding component 4 is rotatably connected to the middle of the two umbrella rib support structures. When the welding component 4 rotates, the movable connecting structure 402 passes through the annular channel, causing the welding component 4 to have a wave-shaped motion trajectory, which enhances the welding quality of the circumferential seam when the anti-corrosion pipe is connected. The annular channel includes a first annular track and a second annular track. When the movable connecting structure 402 passes through the first annular track, the welding component 4 has a first wave-shaped motion trajectory in the transverse direction to enhance the width of the weld. When the movable connecting structure 402 passes through the second annular track, the welding component 4 has a second wave-shaped motion trajectory in the longitudinal direction to enhance the depth of the weld.

[0024] The inner support assembly 1 includes a fixed rod 101 installed on the fixed part of the external drive device, two fixed rings 102 installed at both ends of the fixed rod 101, two sets of sliding grooves 103 opened on both sides of the fixed rod 101, and six sliding grooves 103 in each set are equidistantly distributed in a ring on the fixed rod, and a pull rod 104 slidably connected inside the fixed rod 101, and the pull rod 104 is connected to the drive part of the external drive device.

[0025] The spreading structure 2 includes two sliders 201 slidably connected in two sets of sliding grooves 103, two movable rings 202 installed on the two sliders 201, a linkage frame 203 connected between the two movable rings 202, twelve linkage rods 204 respectively movably connected to the middle of twelve support rods 205, and one linkage rod 204 and support rod 205 form a set of umbrella ribs, and six sets of surrounding umbrella ribs form an umbrella rib support structure, and the umbrella rib support structure is respectively connected to the movable ring 202 and the fixed ring 102; twelve support components 3 are provided at the ends of the twelve support rods 205.

[0026] The welding assembly 4 is mounted on the linkage frame 203. The welding assembly 4 moves linearly along the axis of the linkage frame 203 and rotates circumferentially along the axis of the linkage frame 203.

[0027] The inner support assembly 1 also includes elastic telescopic rods 105 and auxiliary wheels 106. Two sets of elastic telescopic rods 105 are respectively located at both ends of the inner support assembly 1, and the six elastic telescopic rods 105 of each set are equidistantly arranged in a ring on the inner support assembly 1. Twelve auxiliary wheels 106 are installed at the ends of the twelve elastic telescopic rods 105.

[0028] This invention utilizes the design of an inner support component 1, a spreading structure 2, a support component 3, and a welding component 4. The inner support component 1 drives the spreading structures 2 at both ends to form a mirror-symmetrical umbrella-rib support structure. The support components 3, distributed in an umbrella-rib pattern, form two annular channels at the ends. This mirror-support design ensures uniform force distribution on the inner wall of the workpiece and provides a motion reference for the welding component 4. The welding component 4 is rotatably connected to the middle of the umbrella-rib support structure. During rotation, its movable connecting structure 402 moves along the annular channels. The channel shape allows the movable connecting structure 402 to naturally form a wave-like trajectory, thereby driving the welding head to form a reinforced weld. The design of this invention allows the welding component 4 to rely on the wave-like trajectory formed by the annular channels, increasing the weld contact area and dispersing stress during welding on the inner wall of the workpiece. Simultaneously, the rotation enables continuous circumferential welding, adapting to both straight and irregularly shaped sections without additional adjustments, significantly improving welding quality and operational flexibility.

[0029] This invention utilizes the umbrella-rib design of the inner support component 1 and the opening structure 2. Through the cooperation of the fixed part and the driving part of the external driving device, the driving part pulls the pull rod 104, and the fixed part fixes the fixed rod 101, allowing the pull rod 104 to slide inside the fixed rod 101. This drives the slider 201 of the opening structure 2 to move synchronously along the slide groove 103, which in turn drives the movable ring 202 and the linkage frame 203 to drive the linkage rod 204 and the support rod 205, causing the two umbrella-rib support structures to open synchronously. The equidistant annular distribution of the umbrella ribs in the umbrella-rib support structure ensures that the supporting force is uniformly transmitted along the circumference of the inner wall of the workpiece, avoiding workpiece deformation caused by localized stress. The support component 3 unfolds synchronously with the umbrella-rib support structure, further enhancing the fit and support with the inner wall of the workpiece. The welding component 4, installed on the linkage frame 203, is located in the middle of the two umbrella-rib support structures. It can move linearly along the axis of the linkage frame 203 to adjust the welding depth, and can also rotate circumferentially to adapt to welds at different angles. With the stable positioning of the umbrella-shaped support, the welding position can be aligned without additional calibration. This invention, through the design of the internal support component and the opening structure, achieves synchronous linkage of twelve sets of umbrella ribs through a single tie rod drive, adapting to workpieces with different inner diameters. The uniformity of the umbrella-shaped support and the multidimensional motion of the welding components are combined to greatly improve the stability of the internal support and the flexibility of welding.

[0030] Specifically, such as Figures 6 to 9As shown, the support assembly 3 includes a rod positioning structure 301, a first welding drive structure 302, a second welding drive structure 303, and a support plate 304; twelve rod positioning structures 301 are respectively disposed at the ends of twelve support rods 205, six first welding drive structures 302 are disposed on the six rod positioning structures 301 of one umbrella rib support structure, six second welding drive structures 303 are disposed on the six rod positioning structures 301 of another umbrella rib support structure, and twelve support plates 304 are disposed on the six first welding drive structures 302 and the six second welding drive structures 303.

[0031] The pole positioning structure 301 includes movable poles 3011 and telescopic poles 3012; twelve movable poles 3011 are rotatably connected to the ends of twelve support poles 205, and the telescopic poles 3012 are fixedly connected to the umbrella rib support structure. The twelve telescopic poles 3012 are installed on the twelve movable poles 3011.

[0032] This invention utilizes the coordinated design of the rod positioning structure 301 and the driving structure 401 in the support assembly 3. The rod positioning structure 301 is located at the end of the support rod 205. The movable rod 3011 is rotatably connected to the support rod 205 and can flexibly adjust its angle as the support rod 205 opens. The telescopic rod 3012 is installed in two groups on the fixed ring 102 and the movable ring 202 respectively, and can synchronously extend and retract to adjust its length. The two work together to accurately position the support plate 304 in the radial and circumferential directions, adapting to the inner wall curvature of workpieces with different inner diameters. Six first welding driving structures 302 on one side and six second welding driving structures 303 on the other side drive the corresponding support plate 304 to move, which not only adjusts to fit tightly against the inner wall of the workpiece with the rod positioning structure 301, but also strengthens local support. With the angle adjustment of the movable rod 3011 and the length adaptation of the telescopic rod 3012, the twelve groups of support plates 304 open synchronously with the umbrella rib structure to form a fully fitted support surface. The present invention, through the coordinated design of the rod positioning structure 301 and the driving structure 401, can ensure that the support structure and the inner wall of the pipe always remain straight, so that the circumferential force of the pipe is uniform, providing a stable reference for the middle welding assembly and improving the accuracy and reliability of the inner wall welding.

[0033] It is worth noting that, such as Figures 12 to 15 As shown, the welding assembly 4 of the present invention includes a drive structure 401, a movable connection structure 402, and an arc welding device 403; the drive structure 401 is connected to a linkage frame 203, the movable connection structure 402 is disposed on the drive structure 401, and the arc welding device 403 is disposed on the movable connection structure 402.

[0034] The drive structure 401 includes a fixed gear ring 4011, a gear 4012, a first rotary drive 4013, a third telescopic drive 4014, a mounting column 4015, and a fourth telescopic drive 4016. The fixed gear ring 4011 is rotatably connected to a linkage frame 203. The gear 4012 is meshed with the inner side of the fixed gear ring 4011. The output end of the first rotary drive 4013 is connected to the gear 4012 and is mounted on the linkage frame 203. The third telescopic drive 4014 is mounted on the fixed gear ring 4011. The mounting column 4015 is mounted on the output end of the third telescopic drive 4014 and is slidably connected to the fixed gear ring 4011. The telescopic direction is radial to the pipe. The fourth telescopic drive 4016 is mounted inside the mounting column 4015. The movable connection structure 402 is provided on the fourth telescopic drive 4016.

[0035] This invention utilizes the design of the driving structure 401 and the movable connection structure 402 in the welding assembly 4. The fixed gear ring 4011 of the driving structure 401 is rotatably connected to the linkage frame 203. The first rotation drive 4013 drives the fixed gear ring 4011 to rotate through the meshing of the gear 4012, allowing the entire welding assembly 4 to rotate circumferentially along the axis of the linkage frame 203, which is suitable for welding circumferential seams. The third telescopic drive 4014 is installed on the fixed gear ring 4011 and can drive the mounting column 4015 and the end structure to radially extend and retract, adjusting the distance between the welding equipment and the inner wall of the workpiece. The fourth telescopic drive 4016 inside the mounting column 4015 is connected to the movable connection structure 402, which can further fine-tune the axial position of the arc welding equipment 403. Combined with the flexible rotation of the movable connection structure 402, it ensures that the welding head is accurately aligned with the welding point. The present invention, through the design of the driving structure 401 and the movable connection structure 402 in the welding component 4, allows the arc welding equipment 403 to move flexibly between the two umbrella-shaped support structures, adapting to the welding needs of cylindrical workpieces with different inner diameters and different weld positions. Combined with the stable internal support of the support component, all-round welding can be completed without multiple clamping, greatly improving welding efficiency and accuracy.

[0036] Furthermore, such as Figures 6 to 17 As shown, the first welding drive structure 302 of the present invention includes a mounting bracket 3021, a first track 3022, a first ejector block 3023, and a first telescopic drive 3024; six mounting brackets 3021 are connected to six movable rods 3011 of a rod positioning structure 301; six first tracks 3022 are mounted on the six mounting brackets 3021, and the six first tracks 3022 form an intermittent first annular track; one side of the first track 3022 is provided as an opening; seven first ejector blocks 3023 are slidably connected to one side of the first track 3022, and the first ejector blocks 3023 slide in the horizontal direction; the seven first ejector blocks 3023 are mounted on seven first telescopic drives 3024, and all seven first telescopic drives 3024 are mounted on the mounting brackets 3021.

[0037] The second welding drive structure 303 includes a fixed frame 3031, a second track 3032, a second ejector block 3033, and a second telescopic drive 3034. Six fixed frames 3031 are connected to six movable rods 3011 of another rod positioning structure 301. Six second tracks 3032 are installed on the six fixed frames 3031, forming an intermittent second annular track. One side of the second track 3032 is provided as an opening. Fourteen second ejector blocks 3033 are slidably connected to the top and bottom of the second track 3032, and the second ejector blocks 3033 slide in the vertical direction. The fourteen second ejector blocks 3033 are installed on fourteen second telescopic drives 3034, and all fourteen second telescopic drives 3034 are installed on the fixed frames 3031.

[0038] The movable connection structure 402 includes a first connecting block 4021, a groove plate 4022, a first elastic element 4023, a second connecting block 4024, a groove column 4025, and a second elastic element 4026. The first connecting block 4021 is connected to an arc welding device 403 and is horizontally slidably connected to the groove plate 4022. The first connecting block 4021 and the groove plate 4022 are connected through the first elastic element 4023. The second connecting block 4024 is connected to the groove plate 4022 and is vertically slidably connected to the groove column 4025. The second connecting block 4024 and the groove column 4025 are connected through the second elastic element 4026.

[0039] The movable connection structure 402 also includes a lever 4027, a fifth telescopic drive 4028, and a lever head 4029; the lever 4027 is mounted on the first connecting block 4021, the two fifth telescopic drives 4028 are respectively mounted on both sides of the lever 4027, and the output end of the fifth telescopic drive 4028 is equipped with a lever head 4029, and the lever heads 4029 at both ends are slidably connected to the first annular track and the second annular track respectively.

[0040] The lever head 4029 cooperates with the first annular track and the first ejector block 3023 to make the lever head 4029 intermittently reciprocate in the horizontal direction and form a wave-like trajectory.

[0041] The lever head 4029 cooperates with the second annular track and the second ejector block 3033 to make the lever head 4029 intermittently reciprocate in the vertical direction and form a wave-like trajectory.

[0042] This invention utilizes the sliding engagement of a first annular track and a second annular track with a lever head 4029. Six first tracks 3022 form an intermittent first annular track, and six second tracks 3032 form an intermittent second annular track. An opening on one side provides space for the lever head 4029 to move. The lever head 4029 extends via a fifth telescopic drive 4028 and slides onto the two tracks. When the first welding drive structure 302 operates, the tracks define the horizontal annular movement trajectory of the lever head 4029, preventing deviation. Through the cooperation of the first annular track, the second annular track, and the lever head 4029, this invention constructs an annular movement reference for the inner wall of the annular pipe in the arc welding equipment 403, ensuring precise and controllable welding trajectory along the pipe's annular shape, thus providing a foundation for the subsequent formation of a uniform weld.

[0043] This invention utilizes the linkage between the ejector blocks on the annular track and the lever head 4029. Seven first ejector blocks 3023 are evenly distributed along the first annular track. When they extend simultaneously, by adjusting the extension length of each ejector block, the lever head 4029 experiences differentiated thrust in the horizontal direction, forming a continuous wave-like movement along the annular track. When it is necessary to enhance the sealing performance of the pipe inner wall joint, the ejector blocks are controlled to form a small-amplitude wave weld, and the sealing performance is improved through multi-point contact between the weld and the inner wall. When dealing with scenarios with high structural strength requirements, a large-amplitude wave weld is used, and the zigzag distribution of the weld increases the fusion area and improves the overall load-bearing capacity. Furthermore, by asymmetrically adjusting the extension length of the ejector blocks, an asymmetrical wave weld biased to one side can also be formed, which is suitable for welding scenarios where there are irregular structures such as local protrusions or steps on the inner wall of the pipe, ensuring that the welding head is always in contact with the weld position. When the lever head 4029 is slidably connected to the second annular track, the second ejector blocks 3033 at the top and bottom selectively extend and retract to form a synergistic thrust. When the bottom ejector block extends, it pushes the lever head 4029 upward; when the top ejector block extends, it presses the lever head 4029 downward. Through these alternating movements, the lever head 4029 is driven to move intermittently in the vertical direction along the annular track. This intermittent movement creates a rhythm of pause, welding, and movement in the vertical direction for the welding head of the arc welding equipment 403. The pause duration can be adjusted according to the requirements of the weld seam on the inner wall of the pipeline to achieve localized thickening of the weld seam or uniform thin-layer weld seam. The second ejector blocks 3033 at the top and bottom of the second annular track, through differentiated extension and retraction, push the lever head 4029 to form a wave-shaped movement trajectory along the track, thereby driving the arc welding equipment 403 to form a wave-like movement. The wavy weld seam achieves multi-dimensional optimized welding results. Through alternating convex and concave shapes, the wavy weld seam significantly increases the actual contact area with the pipe's inner wall compared to traditional straight weld seams. When the pipe is subjected to axial tension, radial pressure, or torsional force, the stress is dispersed and transmitted along the wavy trajectory, avoiding the stress concentration in a single linear area found in straight weld seams. Furthermore, the wavy movement of the lever head 4029 causes the welding head to oscillate periodically, promoting thorough stirring of the molten pool metal and reducing welding defects such as bubbles and slag inclusions. At the crest of the wavy trajectory, the second ejector block 3033 slows down the movement of the lever head 4029, extending the welding head's dwell time in that area and forming a penetration-strengthened zone. In thick-walled pipe welding, this can achieve a layered reinforcement effect, making the weld seam more firmly bonded to the pipe base material and improving the overall density of the weld seam. This invention, by designing different ejector block structures on both sides, optimizes the welding effect of pipe circumferential weld seams, enhances weld strength, and adapts to more diverse welding needs.

[0044] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. An internally supported root welding device for circumferential welding of corrosion-resistant pipelines, characterized in that, It includes an internal support component (1), a support structure (2), a support component (3), and a welding component (4); The inner support component (1) is used to drive the opening structure (2). The two opening structures (2) are located at both ends of the inner support component (1) and together form two mirror-arranged umbrella rib support structures. Several ends of the umbrella rib support structure are respectively connected to several support components (3), and the two sets of support components (3) on the two umbrella rib support structures form two annular channels. The welding assembly (4) is rotatably connected to the middle of the two umbrella-rib support structures. When the welding assembly (4) rotates, the movable connection structure (402) passes through the annular channel, making the welding assembly (4) move in a wave-shaped trajectory to enhance the welding quality of the circumferential seam when the anti-corrosion pipe is joined. The annular channel includes a first annular track and a second annular track; when the movable connecting structure (402) passes through the first annular track, the welding assembly (4) moves in a first wave-shaped trajectory in the transverse direction to enhance the width of the weld; when the movable connecting structure (402) passes through the second annular track, the welding assembly (4) moves in a second wave-shaped trajectory in the longitudinal direction to enhance the depth of the weld.

2. The internal support type root welding device for circumferential welding of corrosion-resistant pipelines according to claim 1, characterized in that, The inner support assembly (1) also includes elastic telescopic rods (105) and auxiliary wheels (106). Two sets of elastic telescopic rods (105) are respectively located at both ends of the inner support assembly (1), and several elastic telescopic rods (105) of each set are arranged in a ring at equal intervals on the inner support assembly (1). Several auxiliary wheels (106) are installed at the ends of several elastic telescopic rods (105).

3. The internal support type root welding device for circumferential welding of corrosion-resistant pipelines according to claim 1, characterized in that, The support assembly (3) includes a rod positioning structure (301), a first welding drive structure (302), a second welding drive structure (303), and a support plate (304). A plurality of rod positioning structures (301) are respectively disposed at a plurality of ends of two umbrella rib support structures, a plurality of first welding drive structures (302) are disposed on a plurality of rod positioning structures (301) of one umbrella rib support structure, a plurality of second welding drive structures (303) are disposed on a plurality of rod positioning structures (301) of another umbrella rib support structure, and a plurality of support plates (304) are disposed on a plurality of first welding drive structures (302) and a plurality of second welding drive structures (303).

4. The internal support root welding device for circumferential welding of corrosion-resistant pipelines according to claim 3, characterized in that, The pole positioning structure (301) includes a movable pole (3011) and a telescopic pole (3012); the movable pole (3011) is rotatably connected to the end of the umbrella rib support structure, and the telescopic pole (3012) is fixedly connected to the umbrella rib support structure; a plurality of the telescopic poles (3012) are installed on a plurality of movable poles (3011).

5. The internal support root welding device for circumferential welding of corrosion-resistant pipelines according to claim 3, characterized in that, The first welding drive structure (302) includes a mounting bracket (3021), a first track (3022), a first ejection block (3023), and a first telescopic drive (3024). A plurality of mounting brackets (3021) are connected to a plurality of movable rods (3011) of a rod positioning structure (301). A plurality of first tracks (3022) are mounted on a plurality of mounting brackets (3021). The plurality of first tracks (3022) form an intermittent first annular track. One side of the first track (3022) is provided as an opening. A plurality of first ejector blocks (3023) are slidably connected to one side of the first track (3022), and the first ejector blocks (3023) slide in the horizontal direction. A plurality of first ejector blocks (3023) are mounted on a plurality of first telescopic drives (3024). A plurality of first telescopic drives (3024) are all mounted on the mounting brackets (3021).

6. The internal support root welding device for circumferential welding of corrosion-resistant pipelines according to claim 3, characterized in that, The second welding drive structure (303) includes a fixed frame (3031), a second track (3032), a second ejection block (3033), and a second telescopic drive (3034). A plurality of fixed frames (3031) are connected to a plurality of movable rods (3011) of another rod positioning structure (301). A plurality of second tracks (3032) are mounted on a plurality of fixed frames (3031). The plurality of second tracks (3032) form an intermittent second ring track. One side of the second track (3032) is provided with an opening. A plurality of second ejector blocks (3033) are slidably connected to the top and bottom ends of the second track (3032), and the second ejector blocks (3033) slide in the vertical direction. A plurality of second ejector blocks (3033) are mounted on a plurality of second telescopic drives (3034). A plurality of second telescopic drives (3034) are all mounted on fixed frames (3031).

7. The internal support type root welding device for circumferential welding of corrosion-resistant pipelines according to claim 1, characterized in that, The welding assembly (4) includes a drive structure (401), a movable connection structure (402), and an arc welding device (403). The drive structure (401) is connected to the middle of the two umbrella rib support structures, the movable connection structure (402) is provided on the drive structure (401), and the arc welding equipment (403) is provided on the movable connection structure (402).

8. The internal support root welding device for circumferential welding of corrosion-resistant pipelines according to claim 7, characterized in that, The drive structure (401) includes a fixed gear ring (4011), a gear (4012), a first rotary drive (4013), a third telescopic drive (4014), a mounting post (4015), and a fourth telescopic drive (4016). The fixed gear ring (4011) is rotatably connected to the middle of the two umbrella rib support structures. The gear (4012) is meshed with the inner side of the fixed gear ring (4011). The output end of the first rotary drive (4013) is connected to the gear (4012), and the first rotary drive (4013) is installed in the middle of the two umbrella rib support structures. The third telescopic drive (4014) is installed on the fixed gear ring (4011). The mounting post (4015) is installed on the output end of the third telescopic drive (4014), and the mounting post (4015) is slidably connected to the fixed gear ring (4011). The fourth telescopic drive (4016) is installed inside the mounting post (4015), and the movable connection structure (402) is provided on the fourth telescopic drive (4016).

9. The internal support type root welding device for circumferential welding of corrosion-resistant pipelines according to claim 7, characterized in that, The movable connection structure (402) includes a first connecting block (4021), a groove plate (4022), a first elastic element (4023), a second connecting block (4024), a groove column (4025), and a second elastic element (4026). The first connecting block (4021) is connected to an arc welding device (403), and the first connecting block (4021) is horizontally slidably connected to the groove plate (4022). The first connecting block (4021) and the groove plate (4022) are connected by a first elastic element (4023). The second connecting block (4024) is connected to the groove plate (4022), and the second connecting block (4024) is vertically slidably connected to the groove column (4025). The second connecting block (4024) and the groove column (4025) are connected by a second elastic element (4026).

10. The internal support type root welding device for circumferential welding of corrosion-resistant pipelines according to claim 9, characterized in that, The movable connection structure (402) also includes a lever (4027), a fifth telescopic drive (4028), and a lever head (4029). The lever (4027) is mounted on the first connecting block (4021), and the two fifth telescopic drives (4028) are respectively mounted on both sides of the lever (4027). The output end of the fifth telescopic drive (4028) is equipped with a lever head (4029), and the lever heads (4029) at both ends are respectively slidably connected to the first annular track and the second annular track. The lever head (4029) cooperates with the first annular track and the first ejector block (3023) to make the lever head (4029) intermittently reciprocate in the horizontal direction and form a wave-shaped trajectory; The lever head (4029) cooperates with the second annular track and the second ejector block (3033) to make the lever head (4029) intermittently reciprocate in the vertical direction and form a wave-like trajectory.

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