Repair welding device for oil and gas storage and transportation pipeline

Abstract

The invention relates to the technical field of gas pipeline repairing devices, in particular to an oil and gas storage and transportation pipeline repairing and welding device which comprises two fixing rings, the two fixing rings are rotationally connected, a plurality of positioning holes are formed in the outer surfaces of the fixing rings, locking rods are arranged in the positioning holes in a threaded and sleeved mode, and the outer surfaces of the locking rods are in threaded connection with locking rings. Extension rods are arranged on the outer sides of the two fixing rings and arranged on the outer surfaces of the locking rods in a sleeving mode, connecting blocks are slidably connected to the inner ends of the extension rods, a plurality of supporting blocks are arranged between the two connecting blocks, the outer surfaces of the supporting blocks are sleeved with movable shells, and welding guns used for repair welding operation are rotationally installed on the outer surfaces of the movable shells. By means of the strip-shaped structure composed of the multiple supporting blocks, the movement track of the movable shell can be adjusted in real time according to the weld joint surface appearance characteristics and the geometric shape of weld joint textures, accurate tracking of irregular weld joints is achieved, the self-adaptive capacity of the device is improved, and then the automation degree and welding precision of repair welding operation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline repair devices, and specifically to a repair welding device for oil and gas storage and transportation pipelines. Background Technique

[0002] As an important facility in the processes of oil and gas extraction, transportation, and storage, the safety and stability of oil and gas pipelines are directly related to energy transmission efficiency and environmental safety. However, during long-term operation, pipelines often develop leaks or structural defects due to factors such as external force impact, corrosion, and fatigue damage, and urgent repairs are needed. Welding repair is one of the most widely used pipeline repair methods at present, with advantages such as simple construction, firm connection, and good sealing performance.

[0003] After retrieval, it was found that the prior art with the publication number CN219520976U discloses a gas pipeline repair welding device, including a first half-ring and a second half-ring, which are bolt-connected. The fixed end of the elastic welding strip is welded to the inner wall of the first half-ring, and the movable end of the elastic welding strip penetrates through the first half-ring. A pressing component for pressing the elastic welding strip is hinged on the outer wall of the first half-ring. In this solution, first, the uncompletely locked first half-ring and second half-ring are sleeved on the pipeline to be repaired, then the movable end of the elastic welding strip is tightened, so that the elastic welding strip closely surrounds the pipeline to be repaired, and the movable end of the elastic welding strip is pressed against the outer wall of the first half-ring with the pressing component. Then, the first half-ring and the second half-ring are locked with bolts. Finally, welding operations can be carried out. With such a structural design, it is not only simple to operate but also applicable to welding pipelines of different diameters.

[0004] Therefore, based on the above retrieval and in combination with the existing technology, most of the existing oil and gas storage and transportation pipeline welding repair devices have fixed structures, are difficult to dynamically adjust according to the irregular morphology of the weld surface, and cannot achieve precise tracking of the geometric changes of the weld texture, resulting in the dependence of repair operations on manual operations. At the same time, the control method of the welding torch movement trajectory in the existing devices is single, and there is generally a lack of a flexible reciprocating swing mechanism, which cannot achieve a dynamic response synchronized with the weld direction, resulting in insufficient wetting of the weld edge and unstable joint quality, affecting the deposition effect and welding efficiency. For this reason, this application proposes a repair welding device for oil and gas storage and transportation pipelines. Summary of the Invention

[0005] The purpose of the present invention is to provide a repair welding device for oil and gas storage and transportation pipelines to solve the problems raised in the above background technique.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil and gas storage and transportation pipeline repair welding device, comprising two fixing rings, the two fixing rings are rotatably connected, a plurality of positioning holes are opened on the outer surface of the fixing ring, locking rods are threadedly sleeved in the positioning holes, and the locking rings are threadedly connected to the outer surface of the locking rods, an extension rod is arranged on the outer side of the two fixing rings, and the extension rod is sleeved on the outer surface of the locking rod, a connecting block is slidably connected to the inner end of the extension rod, a plurality of supporting blocks are arranged between the two connecting blocks, a movable shell is sleeved on the outer surface of the movable shell, a welding gun for repair welding operation is rotatably installed, among the plurality of supporting blocks, the supporting block located on the extension rod side is rotatably connected with the connecting block, two adjacent supporting blocks are rotatably connected by a guide shaft, and the plurality of supporting blocks are connected in sequence by the guide shaft.

[0007] As a further solution of the present invention, a driving line is passed through the support block and the inner end of the guide shaft, and the guide shaft is provided with two groups, each group of guide shafts is rotatably connected with two adjacent support blocks, and two matching sleeves are rotatably installed on the outer surface of the guide shaft, and the matching sleeves are fixedly connected to the support block, and two locking blocks are passed through the inner end of the guide shaft, and each locking block corresponds to the two matching sleeves respectively.

[0008] As a further solution of the present invention, a locking groove is provided at the inner end of the mating sleeve, and when the locking block moves radially outward, its end forms a snap fit with the locking groove, and two guide plates are passed through the inner end of the guide shaft, and a passive ring is passed through the inner end of the guide shaft, one end of the guide plate is fixed to the passive ring, and the other end is connected to the locking block, and a pushing block is provided inside the guide shaft, and the pushing block is fixedly mounted on the outer surface of the driving line.

[0009] As a further solution of the present invention, two passive shafts are fixedly installed on the inner end of the guide shaft, and the two passive shafts are on the same axis. A limiting ring is sleeved on the outer surface of the passive shaft, and the limiting ring is fixedly connected to the guide shaft. A passive sleeve is arranged on the side of the limiting ring away from the passive shaft, and two locking clips are sleeved on the inner end of the passive sleeve, and the locking clips are connected to the limiting ring by a reset spring piece. Under the elastic force of the reset spring piece, the outer surface of the locking clip fits with the inner wall of the passive sleeve, and the coaxial passive shaft and limiting ring structure are ensured to ensure the coaxiality and stability of the moving parts and reduce the runout error.

[0010] As a further solution of the present invention, a locking tooth is fixedly connected to one end of the driven shaft close to the driven sleeve. The locking tooth is located inside the driven sleeve. A clamping tooth is fixedly installed at the inner end of the locking clamping plate. And the locking clamping plate moves towards the locking tooth direction and wraps the locking tooth. The clamping tooth at the inner end of the locking clamping plate forms an engagement fit with the locking tooth. Under the mutual engagement of the clamping tooth and the locking tooth, the rotational movement of the two driven shafts under the action of external force is effectively prevented.

[0011] As a further solution of the present invention, a clamping groove is provided on the outer surface of the driven sleeve, and the outer surface of the driving wire is arranged in the clamping groove. Two triangular top blocks are fixedly installed at the inner end of the driven sleeve. The two triangular top blocks are located in the gap between the two locking clamping plates. The inclined surface of the triangular top block contacts the edge of the locking clamping plate. And when the driven sleeve rotates, the triangular top block is driven to rotate synchronously. The inclined working surface of the triangular top block contacts the locking clamping plate and generates a radial thrust, forcing the locking clamping plate to generate an axial displacement.

[0012] As a further solution of the present invention, a locking cylinder is fixedly connected to the outer surface of the extension rod, and a movable rod is slidably arranged inside the locking cylinder. The movable rod is fixedly connected to the connecting block. A fastening rod is rotatably installed on the outer surface of the connecting block. This structure realizes the length adjustment function through the axial sliding of the movable rod in the locking cylinder and can be fixed by the locking mechanism after the adjustment is in place.

[0013] As a further solution of the present invention, a guiding gear is rotatably installed at the inner end of the movable housing. An auxiliary block is fixedly arranged on the outer surface of the support block. When multiple support blocks are arranged in an array, each auxiliary block forms an orderly arrangement structure. The outer peripheral teeth of the guiding gear form an engagement fit with the gap between two adjacent auxiliary blocks.

[0014] As a further solution of the present invention, a driven disk is rotatably installed at the upper end of the movable housing, and the driven disk is fixedly connected to the guiding gear. A matching rod is arranged on the side of the driven disk away from the guiding gear. One end of the matching rod away from the driven disk is rotatably installed with a swinging rod, and the end of the swinging rod is sleeved on the upper end of the welding torch. The outer surface of the welding torch is rotatably connected to the movable housing. A slewing bearing structure is arranged between the outer peripheral surface of the welding torch and the movable housing, enabling the welding torch to have a circumferential rotation degree of freedom.

[0015] As a further solution of the present invention, a rotating column is rotatably installed at the upper end of the driven disk. The rotating column is located at a position deviating from the center of the driven disk. A rectangular hole is provided on the outer surface of the matching rod, and the rectangular hole is arranged on the outer surface of the rotating column at any position. The eccentric arrangement of the rotating column forms a crank mechanism, converting the rotational movement of the driven disk into the planar swing of the matching rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention uses a strip structure composed of multiple support blocks to adjust the movement trajectory of the movable shell in real time according to the surface topography characteristics of the weld seam and the geometric shape of the weld texture, achieving precise tracking of irregular weld seams, improving the adaptive ability of the device, and further enhancing the automation level and welding accuracy of the repair welding operation. 2. The present invention drives the passive disk to rotate by using the meshing structure between the auxiliary block and the guiding gear, and drives the welding torch to perform periodic reciprocating swinging through the cooperation rod and the swinging rod. With the coordinated control of the stepping motor and the feeding motor, synchronous tracking of the surface characteristics of the weld seam and dynamic repair welding operations can be achieved, thereby effectively improving the deposition quality and welding efficiency of the welded joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an oil and gas storage and transportation pipeline repair welding device; Figure 2 It is a schematic structural diagram of the support block and the driving wire; Figure 3 It is an exploded view of the support block and the guiding shaft; Figure 4 It is a schematic structural diagram inside the guiding shaft; Figure 5 It is a schematic structural diagram at the passive shaft inside the guiding shaft; Figure 6 It is an exploded view at the passive shaft; Figure 7 It is a schematic structural diagram inside the passive sleeve; Figure 8 It is a schematic structural diagram at the extension rod and the locking cylinder; Figure 9 It is a schematic structural diagram inside the movable shell; Figure 10 It is a schematic structural diagram at the guiding gear and the passive disk; Figure 11 It is a schematic structural diagram at the winding drum and the commutator.

[0018] In the figure: 1. Fixed ring; 2. Locking ring; 3. Locking rod; 4. Movable shell; 5. Welding torch; 6. Guiding tube; 11. Locking strip; 61. Welding wire. 101. Support block; 102. Extension rod; 103. Connecting block; 104. Guiding shaft; 105. Driving wire; 106. Auxiliary block; 107. Fitting sleeve; 108. Locking block; 109. Guiding plate; 110. Passive ring; 111. Pushing block; 112. Locking groove. 201, Driven shaft; 202, Limiting ring; 203, Reset spring piece; 204, Driven sleeve; 205, Clamping groove; 206, Locking card plate; 207, Damping shaft; 208, Triangular top block; 209, Locking tooth; 301, Tightening rod; 302, Movable rod; 303, Locking cylinder; 401, Driven disc; 402, Matching rod; 403, Guide gear; 404, Driving wheel; 405, Stepper motor; 406, Feeding motor; 407, Commutator; 408, Guide wheel; 409, Reel; 410, Swing rod; 411, Rotating column. Specific embodiments

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figures 1-4 , An oil and gas storage and transportation pipeline repair welding device, including two fixing rings 1, the two fixing rings 1 are rotatably connected through a rotating shaft, the bottom end of one of the fixing rings 1 is rotatably installed with a locking bar 11 through a rotating shaft, a clamping block is arranged at the end of the locking bar 11, and a clamping groove is opened at the end of the other fixing ring 1, and a clamping block is rotatably installed at the end of the locking bar 11; When the two fixing rings 1 are sleeved on the outer surface of the pipeline to be repaired and welded, the clamping block at the end of the locking bar 11 is clamped in the clamping groove at the end of the other fixing ring 1, so as to realize the fixation of the device. Among them, the locking method of the clamping block and the clamping groove can adopt any locking structure in the prior art; The outer surface of the fixing ring 1 is provided with a plurality of positioning holes, and the locking rods 3 are threadedly sleeved in the positioning holes, and the outer surface of the locking rod 3 is threadedly connected with the locking ring 2. During operation, the locking rod 3 is first rotated to make its end in close contact with the outer wall of the pipe, and then the locking ring 2 is tightened, thereby enhancing the stability of the fixing ring 1. This structure can provide stable support for the device during the repair welding operation. Extension rods 102 are provided on the outer sides of the two fixing rings 1, and the extension rods 102 are sleeved on the outer surface of the locking rod 3 and are fixed after being tightened by the locking ring 2. The inner ends of the extension rods 102 are slidably connected to the connecting blocks through the slide rails. 103, a plurality of support blocks 101 are arranged between the two connecting blocks 103, a movable shell 4 is sleeved on the outer surface of the support block 101, a welding gun 5 for repair welding is installed on the outer surface of the movable shell 4 through a rotating shaft, and among the plurality of support blocks 101, the support block 101 located on the side of the extension rod 102 is rotatably connected with the connecting block 103, and two adjacent support blocks 101 are rotatably connected through a guide shaft 104. The plurality of support blocks 101 are connected in sequence through the guide shaft 104, so that the overall structure can adapt to the outer wall contour of the pipeline with different thicknesses and can fit the weld surface of various shapes.

[0021] like Figures 2-4 , a driving line 105 is penetrated through the inner ends of the support block 101 and the guide shaft 104, and two groups of guide shafts 104 are provided, and each group of guide shafts 104 is respectively rotatably connected with two adjacent support blocks 101, and the two groups of guide shafts 104 are rotatably connected to each other, so that the support blocks 101 can achieve multi-degree-of-freedom relative movement, thereby ensuring that each support block 101 can adaptively fit the outer wall curved surface of the pipeline with different diameters, while maintaining a uniform support force distribution on the weld area, and the outer surface of the guide shaft 104 is rotatably installed with two matching sleeves 107, and the matching sleeve 107 is fixedly connected to the support block 101 by bolts, and the inner end of the guide shaft 104 is penetrated by two locking blocks 108, and each locking block 108 corresponds to the two matching sleeves 107 respectively; The inner end of the matching sleeve 107 is provided with a locking groove 112. When the locking block 108 moves radially outward, its end forms a snap fit with the locking groove 112. Two guide plates 109 are passed through the inner end of the guide shaft 104. A passive ring 110 is passed through the inner end of the guide shaft 104. The ends of the two guide plates 109 are fixedly welded to the passive ring 110. The other end of the guide plate 109 is fixedly welded to the locking block 108. A pushing block 111 is provided inside the guide shaft 104, and the pushing block 111 is fixedly mounted on the outer surface of the driving line 105. Specifically, the pushing block 111 is arranged on the side of the passive ring 110 facing away from the guiding plate 109. An arc-shaped groove is formed at the inner end of the guiding shaft 104, and the outer surface of the guiding plate 109 is in contact with the inside of the arc-shaped groove. More specifically, the guiding plate 109 is made of elastic metal and is arranged in an arc-shaped structure. When the guiding shaft 104 is subjected to an extrusion force, it can complete a turning movement along the arc-shaped groove and automatically reset to the initial position under the action of the elastic restoring force. A rectangular groove is formed on the outer surface of the locking block 108, and a rectangular block is fixedly installed at the inner end of the guiding shaft 104. The rectangular block is inserted into the rectangular groove, so that the locking block 108 will not rotate during the sliding process.

[0022] Embodiment 2: Please refer to Figures 4-7 , an oil and gas storage and transportation pipeline repair welding device. Based on Embodiment 1, two passive shafts 201 are fixedly installed at the inner end of the guiding shaft 104. The two passive shafts 201 are on the same axis. A limiting ring 202 is sleeved on the outer surface of the passive shaft 201, and the limiting ring 202 is fixedly welded to the guiding shaft 104. Damping holes are formed at the inner ends of the two passive shafts 201, and a damping shaft 207 is inserted into the damping holes. Through the frictional cooperation between the damping shaft 207 and the damping holes, the uncontrolled rotation of the passive shafts 201 is effectively inhibited. A passive sleeve 204 is arranged on the side of the limiting ring 202 away from the passive shaft 201. The damping shaft 207 is located inside the passive sleeve 204. Two locking cards 206 are sleeved at the inner end of the passive sleeve 204, and the locking cards 206 are connected to the limiting ring 202 through a reset elastic piece 203. Under the elastic force of the reset elastic piece 203, the outer surface of the locking card 206 fits with the inner wall of the passive sleeve 204; A locking tooth 209 is fixedly welded to the end of the passive shaft 201 close to the passive sleeve 204. The locking tooth 209 is located inside the passive sleeve 204. The locking card 206 is arc-shaped. A clamping tooth is fixedly installed at the inner end of the locking card 206, and the locking card 206 moves towards the locking tooth 209 and covers the locking tooth 209. The clamping tooth at the inner end of the locking card 206 forms an engaging fit with the locking tooth 209. Under the mutual engagement of the clamping tooth and the locking tooth 209, the rotational movement of the two passive shafts 201 under external force is effectively prevented.

[0023] As Figure 6 、 Figure 7 shown, a clamping groove 205 is formed on the outer surface of the passive sleeve 204, and the outer surface of the driving wire 105 is inserted into the clamping groove 205. Specifically, a plurality of anti-slip damping grooves are formed at the inner end of the clamping groove 205, and anti-sliding blocks are arranged on the outer surface of the driving wire 105. The anti-sliding blocks are inserted into the damping grooves. When the driving wire 105 is pulled, the anti-sliding blocks can drive the passive sleeve 204 to rotate through the damping grooves; Two triangular top blocks 208 are fixedly installed at the inner end of the passive sleeve 204. The two triangular top blocks 208 are located in the gap between the two locking plates 206. The inclined surface of the triangular top block 208 contacts the edge of the locking plate 206. When the passive sleeve 204 rotates, it drives the triangular top block 208 to rotate synchronously. The inclined working surface of the triangular top block 208 contacts the locking plate 206 and generates a radial thrust, forcing the locking plate 206 to generate an axial displacement. A locking cylinder 303 is fixedly welded to the outer surface of the extension rod 102. An active rod 302 is slidably arranged inside the locking cylinder 303. Specifically, two positioning holes are axially spaced on the outer surface of the locking cylinder 303. A flat portion is provided on the outer surface of the active rod 302, and this flat portion is arranged parallel to the axis of the positioning holes. Fixed studs are respectively assembled in the two positioning holes. When the active rod 302 axially moves to a predetermined position, the fixed studs are tightened to abut against the flat portion of the active rod 302, thereby realizing the reliable positioning of the active rod 302.

[0024] The active rod 302 is fixedly connected to the connecting block 103 by bolts. A fastening rod 301 is rotatably installed on the outer surface of the connecting block 103 through a self-locking rotating shaft. The end of the driving wire 105 is fixedly wound around the outer surface of the fastening rod 301. The self-locking rotating shaft adopts an angle self-locking device, which can be automatically positioned and fixed by an internal buckle after rotating to any angle. This self-locking device can be realized by any self-locking mechanism with the same functional principle in the prior art, including but not limited to ratchet type, spring pin type or friction braking type self-locking structures.

[0025] As Figure 1 、 Figure 2 、 Figures 9-11 As shown in A stepping motor 405 is fixedly connected to the bottom end of the movable shell 4 by bolts. The output shaft of the stepping motor 405 is fixedly connected to a driving wheel 404. The driving wheel 404 is located inside the movable shell 4, and the outer surface of the driving wheel 404 contacts the outer surface of the support block 101. Precise angular positioning of the driving wheel 404 can be achieved through step control.

[0026] A passive disk 401 is rotatably installed at the upper end of the movable shell 4, and the passive disk 401 is fixedly connected to the guiding gear 403. A matching rod 402 is provided on one side of the passive disk 401 away from the guiding gear 403. A swing rod 410 is rotatably installed at one end of the matching rod 402 away from the passive disk 401, and the end of the swing rod 410 is sleeved on the upper end of the welding torch 5. The outer surface of the welding torch 5 is rotatably connected to the movable shell 4; As Figure 9 , Figure 10 shown, a rotating column 411 is rotatably installed at the upper end of the passive disk 401. The rotating column 411 is located at a position deviating from the center of the passive disk 401. A rectangular hole is formed on the outer surface of the matching rod 402, and the rectangular hole penetrates through any part of the outer surface of the rotating column 411. A locking buckle is fixedly installed at the upper end of the rotating column 411. When the matching rod 402 can be axially adjusted and installed along the outer surface of the rotating column 411 and is positioned and fixed through the locking mechanism, when the passive disk 401 rotates at a low speed, the welding torch 5 is driven by this transmission mechanism to achieve a controllable swinging motion, so that the welding torch 5 forms a periodic reciprocating motion trajectory during the repair welding process, ensuring that the molten pool fully wets the base metals on both sides of the weld and improving the welding joint quality and deposition efficiency; The swing rod 410 is connected to the rotating column 411 through an adjustable fixing mechanism. By changing the fixing position of the swing rod 410 on the rotating column 411, stepless adjustment of the swinging amplitude of the welding torch 5 is achieved, allowing the operator to accurately set the optimal swinging trajectory of the welding torch 5 according to working condition parameters such as the weld width and pipe diameter.

[0027] As Figure 1 , Figure 11 shown, a reel 409 is rotatably installed on the outer surface of the movable shell 4 through a rotating shaft. A welding wire 61 required during repair welding is wound on the outer surface of the reel 409. A guiding tube 6 is fixedly connected to the outer surface of the movable shell 4 through a clamp, and the free end of the guiding tube 6 is fixedly connected to the outer peripheral surface of the welding torch 5. The outlet of the guiding tube 6 is arranged towards the output end of the welding torch 5. The welding wire 61 penetrates through the internal channel of the guiding tube 6 and is directly conveyed to the output end of the welding torch 5; Specifically, a feeding motor 406 is fixedly installed at the output end of the movable shell 4 through a clamp. A commutator 407 is fixedly installed on the outer surface of the movable shell 4 through bolts. The input shaft of the commutator 407 is rigidly connected to the output shaft of the feeding motor 406. Two guiding wheels 408 are symmetrically arranged at the output end of the commutator 407. The two guiding wheels 408 form a clamping mechanism to precisely constrain the welding wire 61 therebetween. When the feeding motor 406 is driven, the guiding wheels 408 are driven to rotate synchronously through the transmission of the commutator 407, thereby realizing precise feeding control of the welding wire 61.

[0028] It is worth noting that a detachable shaft connection structure is adopted between the welding gun 5 and the movable shell 4, so that the welding gun 5 can be replaced with different models according to different working conditions, and an extended or elbow welding gun can be used in special working conditions.

[0029] The working principle of the present invention is: Before the repair welding operation is performed, the interconnected support blocks 101 are attached to the outer surface of the pipe to be repaired. If there is a bend in the repair welding position, the multiple support blocks 101 can be adjusted and adapted to the outer contour of the pipe through linkage. Then, by rotating the fastening rod 301, the driving wire 105 is wound around its outer surface. During the traction process, the driving wire 105 drives the passive ring 110 to move through the pushing block 111, and drives the locking block 108 to move through the guide plate 109. Then, the locking block 108 is inserted into the matching sleeve 107 and inserted into the locking groove 112. At this time, the support block 101 cannot rotate; At the same time, when the driving wire 105 is pulled, the passive sleeve 204 is driven to rotate through the clamping groove 205. At this time, when the passive sleeve 204 rotates, the locking clamping plate 206 is driven to move in the direction of the locking tooth 209 through the inclined surface of the triangular top block 208, and the locking tooth 209 is wrapped. At this time, the support block 101 cannot rotate laterally, and then the fastening rod 301 is locked, and then the support block 101 after the finalization is picked up, and the extension rod 102 is connected to the positioning hole at the best position on the fixing ring 1, and fixed by the locking rod 3 and the locking ring 2, and then the movable shell 4 is sleeved on the outer surface of the support block 101, and then the welding gun 5 is installed on the outer surface of the movable shell 4. The multiple support blocks 101 can dynamically adjust the trajectory of the movable shell 4 to be moved according to the surface morphology characteristics of the weld and the geometric shape of the actual weld texture in real time; Then the welding gun 5, the stepper motor 405 and the feeding motor 406 are started synchronously, and the welding gun 5 slowly repairs the weld. During the movement, the movable shell 4 forms a meshing transmission with the guide gear 403 through the spaced arrangement of the auxiliary blocks 106, and drives the passive disk 401 to rotate. The matching rod 402 and the swing rod 410 drive 5 to swing slowly, so that the welding gun 5 forms a periodic reciprocating motion trajectory during the repair welding process, ensuring that the molten pool fully wets the parent materials on both sides of the weld, and improving the quality of the welding joint and the welding efficiency.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil and gas storage and transportation pipeline repair welding device, comprising two fixing rings (1), characterized in that: The two fixing rings (1) are rotatably connected, the outer surface of the fixing ring (1) is provided with a plurality of positioning holes, the positioning holes are each threadedly sleeved with a locking rod (3), and the outer surface of the locking rod (3) is threadedly connected with the locking ring (2), the outer sides of the two fixing rings (1) are each provided with an extension rod (102), and the extension rod (102) is sleeved on the outer surface of the locking rod (3), the inner end of the extension rod (102) is slidably connected with a connecting block (103), and a plurality of A support block (101) is provided on the outer surface of the support block (101), a movable shell (4) is sleeved on the outer surface of the movable shell (4), a welding gun (5) for repair welding is rotatably mounted on the outer surface of the movable shell (4), and among the plurality of support blocks (101), a support block (101) located on the side of the extension rod (102) is rotatably connected to a connecting block (103), two adjacent support blocks (101) are rotatably connected via a guide shaft (104), and the plurality of support blocks (101) are sequentially connected via the guide shaft (104).

2. The repair welding device for oil and gas storage and transportation pipelines according to claim 1, characterized in that: A driving line (105) is passed through the inner ends of the support block (101) and the guide shaft (104); two groups of guide shafts (104) are provided, and each group of guide shafts (104) is rotatably connected to two adjacent support blocks (101); two matching sleeves (107) are rotatably mounted on the outer surface of the guide shaft (104), and the matching sleeves (107) are fixedly connected to the support block (101); two locking blocks (108) are passed through the inner end of the guide shaft (104), and each locking block (108) corresponds to the two matching sleeves (107).

3. The repair welding device for oil and gas storage and transportation pipelines according to claim 2, characterized in that: The inner end of the matching sleeve (107) is provided with a locking groove (112), and when the locking block (108) moves radially outward, its end forms a snap fit with the locking groove (112); two guide plates (109) are passed through the inner end of the guide shaft (104); a passive ring (110) is passed through the inner end of the guide shaft (104); one end of the guide plate (109) is fixed to the passive ring (110), and the other end is connected to the locking block (108); a pushing block (111) is provided inside the guide shaft (104), and the pushing block (111) is fixedly mounted on the outer surface of the driving line (105).

4. A repair welding device for oil and gas storage and transportation pipelines according to claim 3, characterized in that: Two passive shafts (201) are fixedly mounted on the inner end of the guide shaft (104), and the two passive shafts (201) are located on the same axis. A limiting ring (202) is sleeved on the outer surface of the passive shaft (201), and the limiting ring (202) is fixedly connected to the guide shaft (104). A passive sleeve (204) is arranged on the side of the limiting ring (202) away from the passive shaft (201). Two locking clamps (206) are sleeved on the inner end of the passive sleeve (204), and the locking clamps (206) are connected to the limiting ring (202) via a reset spring sheet (203). Under the elastic force of the reset spring sheet (203), the outer surface of the locking clamp (206) fits the inner wall of the passive sleeve (204).

5. The repair welding device for oil and gas storage and transportation pipelines according to claim 4, characterized in that: One end of the passive shaft (201) close to the passive sleeve (204) is fixedly connected with a locking tooth (209). The locking tooth (209) is located inside the passive sleeve (204). The inner end of the locking card plate (206) is fixedly installed with a clamping tooth. The locking card plate (206) moves towards the locking tooth (209) and wraps the locking tooth (209). The clamping tooth at the inner end of the locking card plate (206) forms an engaged fit with the locking tooth (209). Under the mutual engagement of the clamping tooth and the locking tooth (209), the rotational movement of the two passive shafts (201) under the action of an external force is effectively prevented.

6. The repair welding device for oil and gas storage and transportation pipelines according to claim 5, characterized in that: A clamping groove (205) is formed on the outer surface of the passive sleeve (204), and the outer surface of the driving wire (105) is arranged in the clamping groove (205). Two triangular top blocks (208) are fixedly installed at the inner end of the passive sleeve (204). The two triangular top blocks (208) are located in the gap between the two locking card plates (206). The inclined surface of the triangular top block (208) contacts the edge of the locking card plate (206). When the passive sleeve (204) rotates, the triangular top block (208) rotates synchronously. The inclined working surface of the triangular top block (208) contacts the locking card plate (206) and generates a radial thrust, forcing the locking card plate (206) to generate an axial displacement.

7. A repair welding device for oil and gas storage and transportation pipelines according to claim 1, characterized in that: A locking cylinder (303) is fixedly connected to the outer surface of the extension rod (102). An active rod (302) is slidably arranged inside the locking cylinder (303). The active rod (302) is fixedly connected with the connecting block (103). A fastening rod (301) is rotatably installed on the outer surface of the connecting block (103).

8. A repair welding device for oil and gas storage and transportation pipelines according to claim 7, characterized in that: A guiding gear (403) is rotatably installed at the inner end of the active shell (4). An auxiliary block (106) is fixedly arranged on the outer surface of the support block (101). When a plurality of support blocks (101) are arranged in an array, the auxiliary blocks (106) form an ordered arrangement structure. The outer peripheral teeth of the guiding gear (403) form an engaged fit with the gap between two adjacent auxiliary blocks (106).

9. The repair welding device for oil and gas storage and transportation pipelines according to claim 1, wherein: A passive disc (401) is rotatably installed at the upper end of the active shell (4). The passive disc (401) is fixedly connected with the guiding gear (403). A mating rod (402) is arranged on one side of the passive disc (401) away from the guiding gear (403). One end of the mating rod (402) away from the passive disc (401) is rotatably installed with a swing rod (410). The end of the swing rod (410) is sleeved on the upper end of the welding torch (5). The outer surface of the welding torch (5) is rotatably connected with the active shell (4).

10. The repair welding device for oil and gas storage and transportation pipelines according to claim 9, characterized in that: A rotating column (411) is rotatably installed at the upper end of the passive disc (401). The rotating column (411) is located at a position deviating from the center of the passive disc (401). A rectangular hole is formed on the outer surface of the mating rod (402), and the rectangular hole is arranged on any part of the outer surface of the rotating column (411).

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