Pipeline welding device for thermal power plant

Abstract

The invention relates to a pipeline welding device for a thermal power plant. The pipeline welding device comprises a frame body, an inner ring centering mechanism, an outer ring centering mechanism, an inner ring welding mechanism and an outer ring welding mechanism, the inner ring centering mechanism comprises a driving motor, a two-way screw rod, two auxiliary supporting seats, two plugs and a guide assembly; the two auxiliary supporting seats are installed on the frame body, the two-way screw penetrates through the two plugs, the two-way screw is rotationally connected with the auxiliary supporting seats, and the two plugs are connected to the two-way screw in a threaded mode; the driving motor is mounted on one of the auxiliary supporting seats; the inner ring welding mechanism comprises a supporting base, a lifting air cylinder and an inner welding machine. The supporting base is horizontally installed on the two-way screw, the lifting air cylinder is installed on the supporting base, and the internal welding machine is installed on a piston rod of the lifting air cylinder. By means of the inner ring centering mechanism and the outer ring centering mechanism, two pipelines of different sizes and specifications can be centered and fixed conveniently, welding of inner ring butt seams and outer ring butt seams of the pipelines of different sizes and specifications is achieved, and the welding quality of the pipelines is improved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power plant pipeline processing equipment, and in particular to a thermal power plant pipeline welding device. Background Art

[0002] A pipeline is a device connected by pipes, pipe connectors and valves for conveying gas, liquid or fluid with solid particles. After the fluid is pressurized by blowers, compressors, pumps and boilers, it flows from the high-pressure part of the pipeline to the low-pressure part. The fluid can also be conveyed by its own pressure or gravity. At present, pipelines are used in thermal power plants for main steam pipelines, hot sections of reheat steam pipelines, cold sections of reheat steam pipelines and high-pressure feed water pipelines.

[0003] The welding device of the thermal power plant pipeline in the prior art includes two left-right symmetrical fixed shafts, one end of the fixed shaft is provided with a first inner support device, so that the pipeline can be sleeved on the outside of the fixed shaft, and the welding position is supported and fixed by the first inner support device; the other end of the fixed shaft is fixedly connected to the bracket, and the bottom of the bracket is slidably connected to the base; a telescopic rod is provided in the middle of the fixed shaft, and the end of the telescopic rod is connected to the second inner support device; the base is also slidably connected with an outer support device, the outer support device includes a hydraulic cylinder, and the hydraulic cylinder is connected to a controller; the first inner support device includes a main gear, a sub-gear, a rack and a first support plate, the main gear is arranged at the center of the inner support device, and a plurality of sub-gears are evenly distributed on the outside of the main gear, the sub-gears are meshed with racks, and the end of the rack is fixedly connected to the support plate; the second support device has the same structure as the first support device.

[0004] In the process of welding the pipeline with the above-mentioned related welding device, the inside of the pipeline is supported by the first inner supporting device and the second inner supporting device. However, since the first inner supporting device and the second inner supporting device are in contact with the inner wall of the pipeline, the staff cannot weld the inner circle joints of the two pipelines, which affects the welding quality of the pipeline. Summary of the invention

[0005] In order to improve the welding quality of pipelines, the present application provides a thermal power plant pipeline welding device.

[0006] The present application provides a thermal power plant pipeline welding device, which adopts the following technical solution: A thermal power plant pipeline welding device comprises a frame, an inner ring centering mechanism, an outer ring centering mechanism, an inner ring welding mechanism and an outer ring welding mechanism; The inner ring centering mechanism includes a driving motor, a bidirectional screw, two auxiliary support seats, two plugs and a guide assembly; The two auxiliary support seats are installed on the frame, and the planes where the two auxiliary support seats are located are arranged in parallel; The bidirectional screw can be disassembled in the axial direction, the bidirectional screw passes through the two plugs, the extension sections of the bidirectional screw extending from the two plugs are rotatably connected to the auxiliary support seat, and the two plugs are respectively threadedly connected to the positive thread section of the bidirectional screw and the negative thread section of the bidirectional screw; The two plugs are symmetrically distributed about the center line of the bidirectional screw, and the cross-sectional areas of the two plugs gradually increase from the side close to each other to the side far away from each other; The driving motor is installed on one of the auxiliary support seats, and the output shaft of the driving motor is coaxially arranged with the bidirectional screw, and the driving motor drives the two plugs to approach each other until the plugs abut against the end of the pipe; The guide assembly is installed on the auxiliary support seat, and the guide assembly is used to make the plug move along the axial direction of the bidirectional screw; The inner ring welding mechanism comprises a support seat, a lifting cylinder and an inner welding machine; The support seat is horizontally mounted on the bidirectional screw, and the support seat is located at the connection between the bidirectional screw positive thread section and the bidirectional screw reverse thread section; The lifting cylinder is installed on the support seat, and the axial direction of the piston rod of the lifting cylinder is perpendicular to the plane where the support seat is located; The internal welding machine is installed on the piston rod of the lifting cylinder, and the welding direction of the internal welding machine is the same as the axial direction of the piston rod of the lifting cylinder; The outer ring centering mechanism is installed on the frame, and the outer ring centering mechanism is arranged close to the welds of the two pipelines, and the outer ring centering mechanism is used to fix the outer sides of the two pipelines; The outer ring welding mechanism is installed on the frame, and is used for welding the butt seams of the outer rings of two pipelines.

[0007] By adopting the above technical solution, during the welding process of two pipes, first, the bidirectional screw is disassembled to split the bidirectional screw into two sections, then, the two pipes are hoisted between the two plugs through the split gap of the bidirectional screw, and the bidirectional screw is passed through the inner cavity of the pipe, and then the bidirectional screw is reinstalled to connect the bidirectional screw as a whole; then the drive motor is adjusted, and the output shaft of the drive motor drives the bidirectional screw to rotate. Due to the action of the guide component, the positive thread section of the bidirectional screw drives one plug to move, and the reverse thread section of the bidirectional screw drives the other plug to move, so that the two plugs approach each other until the ends of the two plugs extend into the pipe openings of the two pipes and are tightly against the pipe openings of the pipes, and then, the outer ring centering mechanism is adjusted to the weld position of the two pipes. The invention relates to a method for fixing the two pipes to realize centering and fixing of the two pipes; then adjusting the lifting cylinder, the piston rod of the lifting cylinder drives the inner welding machine to move until the welding gun head of the inner welding machine is directly opposite to the inner ring joint seams of the two pipes; then, adjusting the inner welding machine to weld the inner ring joint seams of the two pipes, and welding the outer ring joint seams of the two pipes through the outer ring welding mechanism, so as to realize the welding of the outer ring joint seams and the inner ring joint seams of the two pipes; the designed thermal power plant pipeline welding device is convenient for centering and fixing two pipes of different sizes and specifications through the inner ring centering mechanism and the outer ring centering mechanism, and at the same time, it is convenient for welding the inner ring joint seams of the two pipes through the inner ring welding mechanism, so as to realize the welding of the inner and outer ring joint seams of pipes of different sizes and specifications, and improve the welding quality of the pipes.

[0008] Optionally, the bidirectional screw includes a fixed part, a sliding part and a clamping block; the fixed part is coaxially arranged with the sliding part, the fixed part is fixedly connected to the clamping block on one side close to the sliding part, and the clamping block is eccentrically arranged on the fixed part, the clamping block is staggered with the support seat, and the sliding part is provided with a clamping groove for plugging the clamping block at one end close to the fixed part.

[0009] By adopting the above technical scheme, the bidirectional screw is arranged in sections, and the bidirectional screw can be easily split through the fixed part and the sliding part, so that the bidirectional screw can be easily inserted into the inner cavity of the pipeline. At the same time, the fixed part and the sliding part can be easily installed through the clamping block and the clamping groove. Since the clamping block is eccentrically arranged on the fixed part, the synchronous rotation of the fixed part and the sliding part is guaranteed, which makes it easy to drive the two plugs closer to or away from each other, thereby realizing the clamping of the two pipelines.

[0010] Optionally, the inner ring centering mechanism further includes an adjusting component, and the adjusting component includes an adjusting screw, an adjusting motor and a guide slider; The guide slider is arranged on the bottom wall of the auxiliary support seat, and the guide slider and the sliding portion are located on the same auxiliary support seat; The frame is provided with a guide slot for the guide slider to slide, and the guide slot is arranged along the axial direction of the bidirectional screw; The adjusting screw passes through the guide slider and is arranged along the length direction of the guide slot. The adjusting screw is threadedly connected to the guide slider, and one end of the adjusting screw extends out of the frame and is coaxially arranged with the output shaft of the adjusting motor. The adjusting motor is installed on the frame.

[0011] By adopting the above technical scheme, when it is necessary to install the pipeline, the adjusting motor is started, and the output shaft of the adjusting motor drives the adjusting screw to rotate. Since the adjusting screw is threadedly connected to the guide slider, the adjusting screw drives the guide slider to slide along the guide slide groove, and the guide slider drives the auxiliary support seat to move along the length direction of the guide slide groove, and the auxiliary support seat drives the sliding part to move synchronously until the sliding part is separated from the fixed part, until the distance between the sliding part and the fixed part is greater than the sum of the lengths of the two pipelines, and then the two pipelines are installed between the sliding part and the fixed part, and the sliding part and the fixed part are facing the inner cavity of the pipeline, and then the adjusting motor is adjusted, the output shaft of the adjusting motor drives the adjusting screw to rotate, the adjusting screw drives the guide slider to slide along the guide slide groove, and the guide slider drives the auxiliary support seat and the sliding part to move synchronously until the card slot of the sliding part is plugged into the card block of the fixed part, so as to realize the connection between the sliding part and the fixed part; the designed adjusting component is convenient for splitting and connecting the bidirectional screw, and then convenient for installing the pipeline, ensuring that the bidirectional screw drives the two plugs to move closer or farther away from each other, so as to realize the fixation of the outer ports of pipelines with different diameters.

[0012] Optionally, the plug includes a sliding portion and a rotating portion that are coaxially arranged, the sliding portion is rotationally connected to the rotating portion, the sliding portion is threadedly connected to the bidirectional screw, and the rotating portion abuts against the end wall of the pipeline.

[0013] By adopting the above technical solution, the plug is arranged in sections, and its sliding part is easy to cooperate with the bidirectional screw to realize the movement of the sliding part along the axial direction of the bidirectional screw; its rotating part is easy to be connected with the sliding part for rotation, so as to clamp the ends of pipes with different diameters, and at the same time, it is easy for the pipe and the rotating part to rotate synchronously, and then it is easy to cooperate with the inner ring welding mechanism to weld all positions of the inner ring joint seams of the two pipes.

[0014] Optionally, the guide assembly includes a guide rod fixedly connected to the auxiliary support seat, the guide rod passes through the sliding portion, and the guide rod is slidingly connected to the sliding portion, and the guide rod is located between the two auxiliary support seats.

[0015] By adopting the above technical solution, the designed guide assembly is convenient for guiding the sliding part through the guide rod, so that the two sliding parts can approach or move away from each other, and then the rotating parts can approach or move away from each other, thereby ensuring the limited clamping of pipes with different diameters.

[0016] Optionally, the outer ring centering mechanism includes two groups of limit assemblies, the two groups of limit assemblies are symmetrically distributed about the outer ring butt joint of the pipeline, and the limit assemblies are arranged close to the outer ring butt joint of the pipeline; The limiting assembly includes a supporting ring plate, an adjusting ring plate, a plurality of limiting sliders and an adjusting member; The support ring plate is installed on the frame, the support ring plate is coaxially arranged with the adjustment ring plate, and the support ring plate is rotatably connected with the adjustment ring plate; A plurality of limiting sliding grooves for sliding movement of the limiting sliding block are provided on one side of the supporting ring plate close to the adjusting ring plate, and the plurality of limiting sliding grooves are evenly distributed along the circumferential direction of the supporting ring plate, and each of the limiting sliding grooves is arranged along the radial direction of the supporting ring plate; The limiting sliding block is provided with an arc-shaped tooth plate on one side close to the adjusting ring plate, and the adjusting ring plate is provided with a plane spiral tooth plate on one side close to the arc-shaped tooth plate, and the extending section of the arc-shaped tooth plate extending out of the limiting sliding groove is meshed with the plane spiral tooth plate; The adjusting member is installed on the adjusting ring plate, and the adjusting member is used to drive the adjusting ring plate to rotate.

[0017] By adopting the above technical solution, the adjusting member is adjusted, and the adjusting member drives the adjusting ring plate to rotate, and the adjusting ring plate drives the plane spiral tooth groove plate to rotate synchronously. Since the plane spiral tooth groove plate is engaged with the arc tooth plate, the plane spiral tooth groove plate drives the limit slider to slide along the limit slide groove, slides to multiple limit sliders and presses against the outer wall of one of the pipes, so as to achieve limit clamping of the outer sides of pipes with different diameters; the designed outer ring centering mechanism, through two groups of limit components, respectively limits and clamps the two pipes close to one end, to ensure the centering limit and stable support of the two pipes.

[0018] Optionally, the adjusting member includes a plurality of rotating handles, the rotating handles are mounted on the outer peripheral wall of the adjusting ring plate, and the plurality of rotating handles are distributed along the circumferential direction of the adjusting ring plate.

[0019] By adopting the above technical solution, the designed rotating handle is convenient for applying force to the adjusting ring plate, so that the adjusting ring plate rotates along the supporting ring plate, thereby achieving centering limit and stable support for one end of the pipeline.

[0020] Optionally, a connecting rod is provided between the two adjusting ring plates, and the connecting rod is fixedly connected to the adjusting ring plates.

[0021] By adopting the above technical solution, the connecting rod is designed to facilitate the synchronous rotation of the two adjusting ring plates, ensure the synchronous movement of the limit sliders in the two limit assemblies, and realize the centering limit of the two pipes.

[0022] Optionally, the outer ring welding mechanism includes a sliding block, a horizontal cylinder, an adjusting cylinder and an external welding machine; The frame body is provided with a sliding groove for the sliding block to slide, and the sliding groove is arranged along the axial direction of the bidirectional screw; The horizontal cylinder is installed on the frame, and the piston rod of the horizontal cylinder is connected to the sliding block, and the horizontal cylinder drives the sliding block to slide along the sliding groove; The regulating cylinder is installed on the side of the sliding block close to the pipeline, and the piston rod of the regulating cylinder is fixedly connected to the external welding machine, and the welding direction of the external welding machine is the same as the axial direction of the piston rod of the regulating cylinder.

[0023] By adopting the above technical scheme, after the two pipes are fixed in the center limit, the horizontal cylinder is adjusted, and the piston rod of the horizontal cylinder pushes the sliding block to slide along the sliding groove, and the sliding block drives the adjusting cylinder to move synchronously, and the adjusting cylinder drives the external welding machine to move until the welding gun head of the external welding machine is directly opposite to the outer ring joint seams of the two pipes, and then, the adjusting cylinder is adjusted, and the piston rod of the adjusting cylinder drives the external welding machine to move to one side of the outer ring joint seams of the two pipes until the welding gun head of the external welding machine can weld the outer ring joint seams of the two pipes, and the external welding machine is adjusted to weld the outer ring joint seams of the two pipes; the designed outer ring welding mechanism is convenient for driving the external welding machine to move in the horizontal direction and the vertical direction to realize the welding of the outer ring joint seams of the two pipes.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The designed thermal power plant pipeline welding device facilitates the centering and fixing of two pipelines of different sizes and specifications through the inner ring centering mechanism and the outer ring centering mechanism, and stably supports them. At the same time, the inner ring welding mechanism and the outer ring welding mechanism facilitate the welding of the inner and outer ring butt seams of the two pipelines, so as to realize the welding of the inner and outer ring butt seams of pipelines of different sizes and specifications, and improve the welding quality of the pipelines; 2. The designed thermal power plant pipeline welding device has a sliding part that is easy to cooperate with the bidirectional screw through the segmented plugs, so as to realize the movement of the sliding part along the axial direction of the bidirectional screw; the rotating part is easy to be connected with the sliding part for rotation, so as to clamp the ends of pipelines with different diameters, and at the same time, it is easy for the pipeline and the rotating part to rotate synchronously, and then it is easy to cooperate with the inner circle welding mechanism to weld all positions of the inner circle joint seams of the two pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a thermal power plant pipeline welding device according to Example 1 of the present application; Figure 2 is a cross-sectional view of a thermal power plant pipeline welding device according to Example 1 of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 yes Figure 2 An enlarged schematic diagram of part B; Figure 5 yes Figure 2 An enlarged schematic diagram of part C of FIG. Figure 6 It is a partial structural schematic diagram of a thermal power plant pipeline welding device according to Example 1 of the present application, and is intended to illustrate the adjustment components; Figure 7 yes Figure 6 Schematic diagram of the explosion.

[0026] Description of reference numerals: 1. frame; 2. inner ring centering mechanism; 21. auxiliary support seat; 22. driving motor; 23. bidirectional screw; 231. fixing part; 232. sliding part; 233. slot; 234. block; 24. plug; 241. sliding part; 242. rotating part; 25. guide assembly; 251. guide rod; 26. adjusting assembly; 261. guide slide; 262. adjusting motor; 263. adjusting screw; 264. guide slide; 3. outer ring centering mechanism; 31. Limiting assembly; 311. Supporting ring plate; 312. Adjusting ring plate; 313. Limiting slide groove; 314. Limiting slider; 315. Adjusting member; 3151. Turn handle; 316. Arc tooth plate; 317. Plane spiral tooth plate; 318. Connecting rod; 4. Inner ring welding mechanism; 41. Support seat; 42. Lifting cylinder; 43. Inner welding machine; 5. Outer ring welding mechanism; 51. Sliding groove; 52. Horizontal cylinder; 53. Sliding block; 54. Adjusting cylinder; 55. External welding machine. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-7 This application is described in further detail.

[0028] The embodiment of the present application discloses a thermal power plant pipeline welding device.

[0029] Reference Figure 1 and Figure 2 A thermal power plant pipeline welding device comprises a frame 1, an inner ring centering mechanism 2, an outer ring centering mechanism 3, an inner ring welding mechanism 4 and an outer ring welding mechanism 5; the inner ring centering mechanism 2, the outer ring centering mechanism 3, the inner ring welding mechanism 4 and the outer ring welding mechanism 5 are all installed on the frame 1; the inner ring centering mechanism 2 is used to center and fix two pipelines at one end away from each other and provide stable support, the outer ring centering mechanism 3 is used to center and fix two pipelines at one end close to each other and provide stable support, the inner ring welding mechanism 4 is used to weld the inner ring butt seams of the two pipelines, and the outer ring welding mechanism 5 is used to weld the outer ring butt seams of the two pipelines.

[0030] Reference Figure 2 and Figure 3 The inner ring centering mechanism 2 includes a driving motor 22, a bidirectional screw 23, two auxiliary support seats 21, two plugs 24, an adjustment component 26 and a guide component 25; the two auxiliary support seats 21 are installed on the frame 1, and the planes where the two auxiliary support seats 21 are located are arranged in parallel. In this application, one auxiliary support seat 21 is bolted to the frame 1, and the other auxiliary support seat 21 is slidably connected to the frame 1, and the adjustment component 26 is installed on the frame 1 and is used to drive the auxiliary support seat 21 to slide along the frame 1; two The plugs 24 are symmetrically distributed about the center line of the bidirectional screw 23, and the cross-sectional areas of the two plugs 24 gradually increase from the side close to each other to the side away from each other. In this embodiment, the plugs 24 are arranged in a truncated cone shape, and the small ends of the two plugs 24 are close to each other. The plugs 24 include a coaxially arranged sliding portion 241 and a rotating portion 242. The sliding portion 241 is sleeved on the outer periphery of the rotating portion 242, and the sliding portion 241 is rotatably connected to the rotating portion 242. In this embodiment, the sliding portion 241 is The bidirectional screw 23 is cylindrically arranged, and the sliding portion 241 is threadedly connected to the bidirectional screw 23, and the rotating portion 242 abuts against the end wall of the pipeline; the bidirectional screw 23 passes through the two sliding portions 241, and the bidirectional screw 23 is coaxially connected to the sliding portion 241, and the bidirectional screw 23 extends out of the extension section of the two sliding portions 241 and is rotatably connected to the auxiliary support seat 21, and the two sliding portions 241 are respectively threadedly connected to the positive thread section of the bidirectional screw 23 and the reverse thread section of the bidirectional screw 23, and the two sliding portions 24 1 is symmetrically distributed about the center line of the bidirectional screw 23; the driving motor 22 is installed on one of the auxiliary support seats 21, and the driving motor 22 is installed on the movable auxiliary support seat 21, and the extension section of the bidirectional screw 23 extending out of the movable auxiliary support seat 21 is coaxially arranged with the driving motor 22. In this embodiment, the output shaft of the driving motor 22 is connected to the sliding part 232 through a coupling, so that the driving motor 22 drives the two plugs 24 to approach each other until the plugs 24 abut against the end of the pipe.

[0031] Reference Figure 2 and Figure 3The adjusting assembly 26 includes an adjusting screw 263, an adjusting motor 262 and a guide slider 264. The guide slider 264 is arranged on the bottom wall of the auxiliary support seat 21. In this embodiment, the guide slider 264 is fixedly connected to the auxiliary support seat 21, and the guide slider 264 and the sliding portion 232 are located on the same auxiliary support seat 21; a guide groove 261 for the sliding of the guide slider 264 is opened on the frame 1, and the guide groove 261 is arranged along the axial direction of the pipeline; the adjusting screw 263 is arranged through the guide slider 264, and the adjusting screw 263 is arranged along the length direction of the guide groove 261, the adjusting screw 263 is threadedly connected with the guide slider 264, and the adjusting screw 263 extends out of one end of the frame 1 and is coaxially arranged with the output shaft of the adjusting motor 262. In this embodiment, the output shaft of the adjusting motor 262 is connected to the adjusting screw 263 through a coupling, and the adjusting motor 262 is installed on the frame 1.

[0032] Reference Figure 2 and Figure 4 In addition, in order to facilitate the installation of the pipeline, the bidirectional screw 23 in the present application can be disassembled in the axial direction. The specific structure is that the bidirectional screw 23 includes a fixed portion 231, a sliding portion 232 and a block 234. The fixed portion 231 and the sliding portion 232 are coaxially arranged, and the fixed portion 231 and the sliding portion 232 are respectively rotatably connected to the two auxiliary support seats 21, and the sliding portion 232 is installed on the movable auxiliary support seat 21; the fixed portion 231 is fixedly connected to the block 234 on one side close to the sliding portion 232, and the block 234 is eccentrically arranged on the fixed portion 2 31, a slot 233 for plugging a block 234 is provided on the sliding portion 232 near one end of the fixed portion 231, so as to facilitate the detachable connection between the fixed portion 231 and the sliding portion 232. In the present application, the bidirectional screw 23 includes a plug-in state and a separation state. In the plug-in state, the fixed portion 231 and the sliding portion 232 rotate synchronously, so as to facilitate driving the two plugs 24 to move closer to or away from each other. In the separation state, the fixed portion 231 is separated from the sliding portion 232, so as to facilitate the installation of the pipeline along the gap between the fixed portion 231 and the sliding portion 232.

[0033] Reference Figure 1 and Figure 2 The guide assembly 25 is installed on the auxiliary support seat 21, and the guide assembly 25 is used to make the plug 24 move along the axial direction of the bidirectional screw 23; the guide assembly 25 includes a guide rod 251. In this embodiment, two guide rods 251 are provided, and the two guide rods 251 are respectively fixedly connected to the auxiliary support seat 21, and the guide rod 251 passes through the sliding portion 241, and the guide rod 251 is slidingly connected to the sliding portion 241. The guide rod 251 is located between the two auxiliary support seats 21, so as to avoid the sliding portion 241 and the bidirectional screw 23 from rotating synchronously, thereby driving the sliding portion 241 to slide along the axial direction of the bidirectional screw 23.

[0034] Reference Figure 2and Figure 4 The inner ring welding mechanism 4 includes a support seat 41, a lifting cylinder 42 and an internal welding machine 43. The support seat 41 is horizontally mounted on the sliding portion 232, and the support seat 41 is located at the connection between the positive thread section of the bidirectional screw 23 and the negative thread section of the bidirectional screw 23; the lifting cylinder 42 is mounted on the support seat 41, and the axial direction of the piston rod of the lifting cylinder 42 is perpendicular to the plane where the support seat 41 is located. In this embodiment, the lifting cylinder 42 is fixed to the support seat 41 by bolts; the internal welding machine 43 is mounted on the piston rod of the lifting cylinder 42, and the welding direction of the internal welding machine 43 is perpendicular to the active direction of the lifting cylinder 42. The axial directions of the plug rods are the same, so that the welding gun head of the internal welding machine 43 can weld the inner ring joints of the two pipes; and the installation positions of the block 234 and the support seat 41 are staggered, so as to avoid interference between the disassembly position of the bidirectional screw 23 and the support seat 41; in addition, the inner ring welding mechanism 4 in the present application is used for welding thick-walled pipes. Since the weld thickness of thick-walled pipes is relatively large, it is necessary to weld the inner ring joints and outer ring joints of the two pipes successively. When welding thin-walled pipes, the inner ring welding mechanism 4 in the present application does not work, and only the outer ring joints of the two pipes need to be welded.

[0035] Reference Figure 2 and Figure 5 , the outer ring welding mechanism 5 is installed on the frame 1, and the outer ring welding mechanism 5 is used for welding the outer ring butt seams of two pipes; the outer ring welding mechanism 5 includes a sliding block 53, a horizontal cylinder 52, an adjusting cylinder 54 and an external welding machine 55. A sliding groove 51 for sliding the sliding block 53 is provided on the frame 1, and the sliding groove 51 is arranged along the axial direction of the bidirectional screw 23; the horizontal cylinder 52 is installed on the frame 1. In this embodiment, the horizontal cylinder 52 is fixed to the frame 1 by bolts, and the piston rod of the horizontal cylinder 52 is connected to the sliding block 53, and the horizontal cylinder 52 drives the sliding block 53 to slide along the sliding groove 51; the adjusting cylinder 54 is installed on the side of the sliding block 53 close to the pipeline, and the piston rod of the adjusting cylinder 54 is fixedly connected to the external welding machine 55. In this embodiment, the piston rod of the adjusting cylinder 54 is bolted to the external welding machine 55, and the welding direction of the external welding machine 55 is the same as the axial direction of the piston rod of the adjusting cylinder 54.

[0036] Reference Figure 2 , Figure 6 and Figure 7The outer ring centering mechanism 3 is installed on the frame 1. The outer ring centering mechanism 3 is used to fix the outer sides of the two pipes. The outer ring centering mechanism 3 includes two sets of limit assemblies 31. The two sets of limit assemblies 31 are symmetrically distributed about the outer ring joints of the pipes, and the limit assemblies 31 are arranged close to the outer ring joints of the pipes; the limit assemblies 31 include a support ring plate 311, an adjustment ring plate 312, a plurality of limit sliders 314 and an adjustment member 315. The support ring plate 311 is installed on the frame 1. In this embodiment, the support ring plate 311 is fixed to the frame 1 by bolts. The support ring plate 311 and the adjustment ring plate 312 are coaxially arranged, and the support The ring plate 311 is rotatably connected to the adjustment ring plate 312; a plurality of limiting grooves 313 for the sliding movement of the limiting slider 314 are provided on one side of the support ring plate 311 close to the adjustment ring plate 312. In this embodiment, the limiting grooves 313 can be three, four, or five, as long as the sliding movement of the limiting slider 314 along the limiting grooves 313 is achieved, and the centering of the pipeline is fixed. In this embodiment, four limiting sliders 314 are arranged, and the four limiting grooves 313 are evenly distributed along the circumferential direction of the support ring plate 311, and each limiting groove 313 is along the radial direction of the support ring plate 311 Setting; an arc-shaped tooth plate 316 is provided on the side of the limit slider 314 close to the adjustment ring plate 312. In this embodiment, the arc-shaped tooth plate 316 is integrally connected with the limit slider 314, and a plane spiral tooth groove plate 317 is provided on the side of the adjustment ring plate 312 close to the arc-shaped tooth plate 316. In this embodiment, the arc-shaped tooth plate 316 is integrally connected with the adjustment ring plate 312, and the arc-shaped tooth plate 316 extends out of the extension section of the limit slide groove 313 and meshes with the plane spiral tooth groove plate 317; the adjusting member 315 is installed on the adjusting ring plate 312, and the adjusting member 315 is used to drive the adjusting ring plate 312 to rotate, and the adjusting member 315 includes Multiple rotating handles 3151 are installed on the outer peripheral wall of the adjustment ring plate 312. In the present application, the number of rotating handles 3151 can be three, four, or five, as long as they can drive the rotation of the adjustment ring plate 312. In the present embodiment, the number of rotating handles 3151 is four, and the four rotating handles 3151 are evenly distributed along the circumferential direction of the adjustment ring plate 312 to facilitate driving the adjustment ring plate 312 to rotate; a connecting rod 318 is provided between the two adjustment ring plates 312, and the connecting rod 318 is fixedly connected to the adjustment ring plate 312 to facilitate driving the two adjustment ring plates 312 to rotate synchronously.

[0037] The implementation principle of the thermal power plant pipeline welding device of the embodiment of the present application is as follows: during the welding process of two pipelines, first, the adjusting motor 262 is started, and the output shaft of the adjusting motor 262 drives the adjusting screw 263 to rotate. Since the adjusting screw 263 is threadedly connected with the guide slider 264, the adjusting screw 263 drives the guide slider 264 to slide along the guide slide groove 261, and the guide slider 264 drives the auxiliary support seat 21 to move along the length direction of the guide slide groove 261, and the auxiliary support seat 21 drives the sliding part 241 to move synchronously until the sliding part 241 is separated from the fixing part 231, until the sliding part 241 is moved. The distance between the guide rail 241 and the fixed part 231 is greater than the sum of the lengths of the two pipes, and then the two pipes are hoisted between the sliding part 241 and the fixed part 231, and the sliding part 241 and the fixed part 231 are made to face the inner cavity of the pipes, and then the adjusting motor 262 is adjusted, and the output shaft of the adjusting motor 262 drives the adjusting screw 263 to rotate, and the adjusting screw 263 drives the guide slider 264 to slide along the guide slot 261, and the guide slider 264 drives the auxiliary support seat 21 and the sliding part 241 to move synchronously, and move until the slot 233 of the sliding part 241 is plugged into the block 234 of the fixed part 231.

[0038] Then, the driving motor 22 is adjusted, and the output shaft of the driving motor 22 drives the bidirectional screw 23 to rotate. Due to the action of the guide rod 251, the bidirectional screw 23 drives the two plugs 24 to approach each other until the ends of the two plugs 24 extend into the pipe openings of the two pipes, and the rotating part 242 is tightly pressed against the pipe openings of the pipes; then, the turning handle 3151 is rotated, and the turning handle 3151 drives the adjusting ring plate 312 to rotate, and the adjusting ring plate 312 drives the plane spiral tooth groove plate 317 to rotate synchronously. Since the plane spiral tooth groove plate 317 is meshed with the arc tooth plate 316, the plane spiral tooth groove plate 317 drives the limiting slider 314 to slide along the limiting slide groove 313, and slides until the limiting slider 314 is tightly pressed against the outer wall of one of the pipes, thereby realizing the limiting clamping of pipes with different diameters.

[0039] Then adjust the lifting cylinder 42, the piston rod of the lifting cylinder 42 drives the inner welding machine 43 to move, and moves until the welding gun head of the inner welding machine 43 is directly opposite to the inner ring joint seam of the two pipes, and then adjust the inner welding machine 43 to weld the inner ring joint seams of the two pipes; then adjust the horizontal cylinder 52, the piston rod of the horizontal cylinder 52 pushes the sliding block 53 to slide along the sliding groove 51, the sliding block 53 drives the adjusting cylinder 54 to move synchronously, and the adjusting cylinder 54 drives the outer welding machine 55 to move, and moves until the welding gun head of the outer welding machine 55 is directly opposite to the outer ring joint seams of the two pipes, then, adjust the adjusting cylinder 54, the piston rod of the adjusting cylinder 54 drives the outer welding machine 55 to move to one side of the outer ring joint seams of the two pipes, and moves until the welding gun head of the outer welding machine 55 can weld the outer ring joint seams of the two pipes, and adjust the outer welding machine 55 to weld the outer ring joint seams of the two pipes.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A thermal power plant pipeline welding device, characterized in that: It comprises a frame (1), an inner ring centering mechanism (2), an outer ring centering mechanism (3), an inner ring welding mechanism (4) and an outer ring welding mechanism (5); The inner ring centering mechanism (2) comprises a driving motor (22), a bidirectional screw (23), two auxiliary support seats (21), two plugs (24) and a guide assembly (25); The two auxiliary support seats (21) are installed on the frame (1), and the planes where the two auxiliary support seats (21) are located are arranged in parallel; The bidirectional screw (23) can be disassembled in the axial direction, the bidirectional screw (23) passes through the two plugs (24), the bidirectional screw (23) extends out of the extension section of the two plugs (24) and is rotatably connected to the auxiliary support seat (21), and the two plugs (24) are respectively threadedly connected to the positive thread section of the bidirectional screw (23) and the negative thread section of the bidirectional screw (23); The two plugs (24) are symmetrically distributed about the center line of the bidirectional screw (23), and the cross-sectional areas of the two plugs (24) gradually increase from the side close to each other to the side far away from each other; The driving motor (22) is mounted on one of the auxiliary support seats (21), and the output shaft of the driving motor (22) is coaxially arranged with the bidirectional screw (23), and the driving motor (22) drives the two plugs (24) to approach each other until the plugs (24) abut against the end of the pipe; The guide assembly (25) is installed on the auxiliary support seat (21), and the guide assembly (25) is used to make the plug (24) move along the axial direction of the bidirectional screw (23); The inner ring welding mechanism (4) comprises a support seat (41), a lifting cylinder (42) and an inner welding machine (43); The support seat (41) is horizontally mounted on the bidirectional screw (23), and the support seat (41) is located at the connection between the positive thread section of the bidirectional screw (23) and the negative thread section of the bidirectional screw (23); The lifting cylinder (42) is installed on the support seat (41), and the axial direction of the piston rod of the lifting cylinder (42) is perpendicular to the plane where the support seat (41) is located; The internal welding machine (43) is installed on the piston rod of the lifting cylinder (42), and the welding direction of the internal welding machine (43) is the same as the axial direction of the piston rod of the lifting cylinder (42); The outer ring centering mechanism (3) is installed on the frame (1), and the outer ring centering mechanism (3) is arranged close to the welding seams of the two pipelines, and the outer ring centering mechanism (3) is used to fix the outer sides of the two pipelines; The outer ring welding mechanism (5) is installed on the frame (1), and the outer ring welding mechanism (5) is used for welding the butt seams of the outer rings of two pipelines.

2. The thermal power plant pipeline welding device according to claim 1, characterized in that: The bidirectional screw (23) comprises a fixed portion (231), a sliding portion (232) and a clamping block (234); the fixed portion (231) and the sliding portion (232) are coaxially arranged, the fixed portion (231) is fixedly connected to the clamping block (234) on one side close to the sliding portion (232), and the clamping block (234) is eccentrically arranged on the fixed portion (231), the clamping block (234) and the support seat (41) are staggered, and a clamping groove (233) for plugging the clamping block (234) is provided on one end of the sliding portion (232) close to the fixed portion (231).

3. The thermal power plant pipeline welding device according to claim 2, characterized in that: The inner ring centering mechanism (2) further comprises an adjustment assembly (26), wherein the adjustment assembly (26) comprises an adjustment screw (263), an adjustment motor (262) and a guide slider (264); The guide slider (264) is arranged on the bottom wall of the auxiliary support seat (21), and the guide slider (264) and the sliding portion (241) are located on the same auxiliary support seat (21); The frame (1) is provided with a guide slot (261) for the guide slider (264) to slide, and the guide slot (261) is arranged along the axial direction of the bidirectional screw (23); The adjusting screw (263) is arranged to pass through the guide slider (264), and the adjusting screw (263) is arranged along the length direction of the guide slide groove (261). The adjusting screw (263) is threadedly connected to the guide slider (264), and one end of the adjusting screw (263) extends out of the frame (1) and is coaxially arranged with the output shaft of the adjusting motor (262). The adjusting motor (262) is installed on the frame (1).

4. The thermal power plant pipeline welding device according to claim 1, characterized in that: The plug (24) comprises a coaxially arranged sliding portion (241) and a rotating portion (242); the sliding portion (241) is rotationally connected to the rotating portion (242); the sliding portion (241) is threadedly connected to the bidirectional screw (23); and the rotating portion (242) abuts against an end wall of the pipeline.

5. The thermal power plant pipeline welding device according to claim 4, characterized in that: The guide assembly (25) comprises a guide rod (251) fixedly connected to the auxiliary support seat (21); the guide rod (251) passes through the sliding portion (241), and the guide rod (251) is slidingly connected to the sliding portion (241); the guide rod (251) is located between the two auxiliary support seats (21).

6. The thermal power plant pipeline welding device according to claim 1, characterized in that: The outer ring centering mechanism (3) comprises two groups of limit assemblies (31), the two groups of limit assemblies (31) are symmetrically distributed about the outer ring butt joints of the pipeline, and the limit assemblies (31) are arranged close to the outer ring butt joints of the pipeline; The limiting assembly (31) comprises a supporting ring plate (311), an adjusting ring plate (312), a plurality of limiting sliding blocks (314) and an adjusting member (315); The supporting ring plate (311) is mounted on the frame (1), the supporting ring plate (311) and the adjusting ring plate (312) are coaxially arranged, and the supporting ring plate (311) and the adjusting ring plate (312) are rotatably connected; A plurality of limiting sliding grooves (313) for sliding movement of the limiting sliding block (314) are provided on a side of the supporting ring plate (311) close to the adjusting ring plate (312); the plurality of limiting sliding grooves (313) are evenly distributed along the circumferential direction of the supporting ring plate (311), and each of the limiting sliding grooves (313) is arranged along the radial direction of the supporting ring plate (311); An arc-shaped tooth plate (316) is arranged on one side of the limiting sliding block (314) close to the adjusting ring plate (312), and a plane spiral tooth plate (317) is arranged on one side of the adjusting ring plate (312) close to the arc-shaped tooth plate (316), and an extension section of the arc-shaped tooth plate (316) extending out of the limiting sliding groove (313) is meshed with the plane spiral tooth plate (317); The adjusting member (315) is mounted on the adjusting ring plate (312), and the adjusting member (315) is used to drive the adjusting ring plate (312) to rotate.

7. The thermal power plant pipeline welding device according to claim 6, characterized in that: The adjusting member (315) comprises a plurality of rotating handles (3151), wherein the rotating handles (3151) are mounted on the outer peripheral wall of the adjusting ring plate (312), and the plurality of rotating handles (3151) are distributed along the circumferential direction of the adjusting ring plate (312).

8. The thermal power plant pipeline welding device according to claim 6, characterized in that: A connecting rod (318) is provided between the two adjusting ring plates (312), and the connecting rod (318) is fixedly connected to the adjusting ring plates (312).

9. The thermal power plant pipeline welding device according to claim 1, characterized in that: The outer ring welding mechanism (5) comprises a sliding block (53), a horizontal cylinder (52), an adjusting cylinder (54) and an external welding machine (55); The frame (1) is provided with a sliding groove (51) for the sliding block (53) to slide, and the sliding groove (51) is arranged along the axial direction of the bidirectional screw (23); The horizontal cylinder (52) is installed on the frame (1), and the piston rod of the horizontal cylinder (52) is connected to the sliding block (53), and the horizontal cylinder (52) drives the sliding block (53) to slide along the sliding groove (51); The regulating cylinder (54) is installed on the side of the sliding block (53) close to the pipeline, and the piston rod of the regulating cylinder (54) is fixedly connected to the external welder (55), and the welding direction of the external welder (55) is the same as the axial direction of the piston rod of the regulating cylinder (54).

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