A pipeline girth weld preheating and welding mechanism

Abstract

The utility model relates to pipeline welding technical field discloses a kind of pipeline annular weld preheating welding mechanism, and welding mechanism includes outer seam welding mechanism, inner seam welding mechanism, first protective gas output device, second protective gas output device and preheating device, wherein, the outer seam welding mechanism is arranged around the circumference of the pipeline to be welded, including the circular track of the pipeline to be welded, to realize the circumferential movement along outer seam;The inner seam welding mechanism extends into the pipeline to be welded, for shifting and welding inner seam;The preheating device includes the third walking base of the circular track and the heating equipment of the third walking base, and the heating equipment includes the nozzle connected with combustible gas supply device;The first protective gas output device, second protective gas output device are respectively matched with outer seam welding mechanism and inner seam welding mechanism setting.The utility model solves the problem that the welding efficiency of inner and outer seam of pipeline is lower, and the welding point is unevenly distributed.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, specifically to a preheating welding mechanism for pipeline circumferential welds. Background Technology

[0002] Pressure steel pipe welding is widely used in industries such as hydropower stations, petrochemicals, steel and coal mines, and metallurgy. Pipeline welding involves welds made of stainless steel, high-alloy steel, and other materials that require inert gas purging for oxidation protection. Traditional protection methods require pre-fabricating a gas chamber inside the pipe, filling it with inert gas, and completely replacing the air before welding. This process is time-consuming and wastes large quantities of expensive inert gas. Currently, both external and internal welds are done manually, resulting in uneven welds and low welding efficiency. Utility Model Content

[0003] To address existing problems, this utility model provides a preheating welding mechanism for pipe annular welds. By preheating the pipe to be welded through a preheating device arranged along the circumference, and combining it with a protective gas output device to provide gas protection for the weld area, the inner and outer welding torches are precisely aligned. This solves the problems in related technologies, such as the cumbersome introduction of protective gas during welding, low welding efficiency of the outer and inner seams of the pipe, and uneven distribution of weld points.

[0004] To achieve the above objectives, the present invention provides the following technical solution.

[0005] This utility model provides a preheating welding mechanism for a pipe circumferential weld, including an outer weld mechanism, an inner weld mechanism, a first protective gas output device, a second protective gas output device, and a preheating device. The outer weld mechanism is arranged around the circumference of the pipe to be welded and includes a circular track fitted onto the pipe to achieve circumferential movement along the outer weld. The inner weld mechanism extends into the pipe to be welded for displacement and welding of the inner weld. The preheating device includes a third traveling base mounted on the circular track and a heating device mounted on the third traveling base. The heating device includes a nozzle connected to a combustible gas supply device to inject combustion gas for preheating. The first and second protective gas output devices are respectively configured to cooperate with the outer weld mechanism and the inner weld mechanism to supply protective gas.

[0006] As a further improvement of this utility model, the preheating device also includes a mounting screw and a threaded cylinder, the lower end of which is rotatably connected to the third traveling base; a screw is mounted on one side of the nozzle, and the screw and the threaded cylinder are connected to achieve an adjustable distance between the nozzle and the pipe to be welded.

[0007] As a further improvement of this utility model, a first traveling base is provided on the circular track. The first traveling base can move circumferentially around the center of the circular track, and an outer seam welding gun is provided on the first traveling base.

[0008] As a further improvement of this utility model, the circular track is formed by splicing two semi-circular tracks, and connecting plates are provided at both ends of the two semi-circular tracks, and adjacent connecting plates are fixedly connected by bolts.

[0009] As a further improvement of this utility model, the inner seam welding mechanism includes a welding robotic arm, which is a multi-stage telescopic structure; the first end of the welding robotic arm is fixed to the outside of the pipe to be welded, the second end of the welding robotic arm extends into the pipe to be welded, and the second end of the welding robotic arm is provided with an inner seam welding gun; the second end of the welding robotic arm is provided with a drive motor, the shaft of the drive motor can rotate around a horizontal axis, and the shaft of the drive motor is connected to the inner seam welding gun.

[0010] As a further improvement of this utility model, the first protective gas output device includes a second traveling base disposed on the circular track. The second traveling base can move circumferentially around the center of the circular track. An external seam gas output device is disposed on the second traveling base, and the output end of the external seam gas output device is close to the outside of the weld seam to be welded. The external seam gas output device includes an external seam sealing cover and an external seam gas guide pipe. The lower end of the external seam sealing cover is open and close to the outside of the weld seam to be welded. The first end of the external seam gas guide pipe is connected to the external seam sealing cover, and the second end is connected to the protective gas supply device.

[0011] As a further improvement of this utility model, the external seam gas output device also includes a length adjustment mechanism for adjusting the distance between the external seam sealing cover and the weld to be welded; the fixed part of the length adjustment mechanism is a fixed sleeve fixed on the second traveling base, and the fixed sleeve is fixed on the second traveling base; the movable part of the length adjustment mechanism includes a slider, a spring and an adjusting screw disposed in the fixed sleeve, and the movable part is connected to the external seam sealing cover.

[0012] As a further improvement of this utility model, the second protective gas output device includes a traveling mechanism disposed inside the pipe to be welded. The traveling mechanism includes a circumferential traveling mechanism that can move circumferentially inside the pipe to be welded, and an axial traveling mechanism disposed on the circumferential traveling mechanism and that can move axially along the pipe to be welded. An inner seam gas output device is disposed on the axial traveling mechanism.

[0013] As a further improvement of this utility model, it also includes a control system, which includes an outer seam light tracking controller and an inner seam light tracking controller; the outer seam light tracking controller and the inner seam light tracking controller are respectively disposed on the first protective gas output device and the second protective gas output device, and the monitoring ends of the outer seam light tracking controller and the inner seam light tracking controller are respectively used to monitor the weld points where the weld seam to be welded generates light during welding, and feed the signals back to the control system; The control system is electrically connected to the first protective gas output device and the second protective gas output device, respectively, so that the first protective gas output device and the second protective gas output device follow the weld point on the outside of the pipe to be welded.

[0014] As a further improvement of this utility model, it also includes two base frames, each base frame corresponding to a pipe to be welded. The base frame includes a load-bearing plate and guide rollers mounted on the load-bearing plate. The guide rollers are set in multiple groups and distributed along the axial direction of the pipe to be welded. Each group of guide rollers includes an inclined roller body, a horizontal roller body and an inclined roller body distributed in sequence. The pipe to be welded is placed on two inclined roller bodies.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This welding mechanism integrates external seam welding, internal seam welding, preheating, and shielding gas supply functions. It can coordinate the preheating, shielding gas filling, and internal and external seam welding of pipeline circumferential welds, simplifying the shielding gas filling operation during welding, improving the uniformity of external and internal seam welds, and enhancing welding efficiency.

[0016] Preferably, by adjusting the screw and threaded cylinder, the distance between the nozzle and the pipe to be welded can be flexibly adjusted, thereby precisely controlling the distance between the preheating flame and the pipe according to different welding requirements and pipe specifications, ensuring uniform and stable preheating effect, and avoiding local overheating that could cause coarse metal grains, abnormal hardness, or welding defects such as cracks and pores.

[0017] Preferably, the first traveling base drives the outer seam welding torch to move circumferentially around the circular track, so that the outer seam welding torch can weld the outer seam of the pipe evenly and continuously, ensuring the accuracy of the welding trajectory and the stability of the welding quality, and improving the welding efficiency.

[0018] Preferably, two semi-circular tracks are spliced ​​together, which facilitates the installation and disassembly of the circular track. This is especially suitable for welding large pipelines on site, as it makes it easy to assemble the track around the pipeline, improving the applicability and installation efficiency of the equipment.

[0019] Preferably, the welding robotic arm with a multi-stage telescopic structure can flexibly adjust its length according to the inner diameter of the pipe, allowing the inner seam welding torch to be precisely aligned in three degrees of freedom and penetrate into pipes of different specifications for welding; the drive motor drives the inner seam welding torch to rotate around the horizontal axis, enabling the inner seam welding torch to weld at multiple angles inside the pipe, meeting the needs of complex inner seam welding and improving the flexibility and quality of welding.

[0020] Preferably, the second traveling base drives the outer seam gas output device to move circumferentially around the circular track, so that the outer seam gas output device can always be close to the outside of the weld to be welded. The outer seam sealing cover can effectively gather the protective gas, so that the protective gas forms a stable protective atmosphere on the outside of the weld, preventing the weld from being oxidized during the welding process and improving the welding quality. The outer seam gas guide pipe delivers the protective gas from the gas supply device to the outer seam sealing cover, ensuring a continuous supply of protective gas.

[0021] Preferably, the length adjustment mechanism can flexibly adjust the distance between the outer seam sealing cover and the weld to be welded according to the wall thickness and welding requirements of different pipes, ensuring that the outer seam sealing cover can accurately and effectively approach the weld, forming a good protective gas atmosphere, improving the protection effect and welding quality; the spring setting can buffer the impact force during the adjustment process to a certain extent, making the adjustment more stable.

[0022] Preferably, the traveling mechanism enables the inner seam gas output device to move flexibly within the pipeline. The circumferential traveling mechanism and the axial traveling mechanism work together to allow the inner seam gas output device to reach any position within the pipeline seam, ensuring that all parts of the inner seam weld are effectively protected by protective gas during the welding process, preventing the inner seam from being oxidized and improving the welding quality.

[0023] Preferably, the weld point position is monitored in real time by the outer seam ray tracking controller and the inner seam ray tracking controller, and the signal is fed back to the control system. The control system controls the first protective gas output device and the second protective gas output device to follow the movement of the weld point, ensuring that the protective gas always accurately covers the weld. Even if the weld point position changes during the welding process, the output position of the protective gas can be adjusted in time to improve the utilization efficiency and protective effect of the protective gas, and further improve the welding quality.

[0024] Preferably, the pipe to be welded is placed on the two sets of guide rollers, namely, an inclined roller, a horizontal roller and an inclined roller in sequence, which facilitates the centering and welding of the two pipes and avoids weld deviation caused by inaccurate welding angle. Attached Figure Description

[0025] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of a preheating welding mechanism for a pipe circumferential weld in Example 1; Figure 2 This is an enlarged structural diagram of part A in Example 1; Figure 3 This is an enlarged structural diagram of part B in Example 1; Figure 4 This is a schematic diagram of the circular track in Example 1.

[0026] The components include: 1. Welding robotic arm; 2. Pipe to be welded; 3. Outer seam ray tracking controller; 4. Outer seam sealing cover; 5. Second traveling base; 6. Connecting plate; 7. Circular track; 8. Inner seam ray tracking controller; 9. Second protective gas output device; 10. Circumferential traveling mechanism; 11. First traveling cylinder; 12. Second traveling cylinder; 13. Circumferential self-driving wheel; 14. Axial traveling mechanism; 15. Axial self-driving wheel; 16. Bearing; 17. Inclined roller; 18. Horizontal roller; 19. Load-bearing plate; 20. Third traveling base; 21. Preheating device; 22. Inner seam welding gun; 23. Outer seam welding gun; 24. First traveling base; 25. Drive motor; 26. Inner seam sealing cover; 27. Length adjustment mechanism; 271. Spring; 272. Adjustment groove; 273. Adjustment screw; 274. Slider; 275. Fixed sleeve; 28. Nozzle; 29. ​​Screw; 30. Threaded cylinder. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Example 1 This embodiment provides a preheating welding mechanism for a pipe circumferential weld, including an outer weld mechanism, an inner weld mechanism, a first protective gas output device, a second protective gas output device, and a preheating device. The outer weld mechanism is arranged circumferentially around the pipe to be welded and includes a circular track fitted onto the pipe for circumferential welding of the outer weld. The inner weld mechanism extends into the pipe for circumferential welding of the inner weld. The preheating device includes a third traveling base mounted on the circular track and a heating device mounted on the third traveling base. The heating device includes a nozzle connected to a combustible gas supply device to inject combustion gas for preheating. The first and second protective gas output devices supply protective gas to the outer weld mechanism and the inner weld mechanism, respectively, to assist in welding.

[0031] Specifically, such as Figure 1 As shown in the figure, this application provides a pipeline annular weld preheating welding mechanism, which includes: an outer weld welding mechanism, an inner weld welding mechanism, a first protective gas output device, and a second protective gas output device 9.

[0032] like Figure 2 As shown, the external seam welding mechanism includes a circular track 7 fitted on the pipe to be welded, a first traveling base 24 provided on the circular track 7, the first traveling base 24 can move circumferentially around the center of the circular track 7, and an external seam welding gun 23 is provided on the first traveling base 24.

[0033] like Figure 1 As shown, the internal seam welding mechanism includes a welding robotic arm 1. The first end of the welding robotic arm 1 is fixed to the outside of the pipe to be welded, and the second end of the welding robotic arm 1 extends into the pipe to be welded. An internal seam welding gun 22 is provided at the second end of the welding robotic arm 1.

[0034] like Figure 1 As shown, the first protective gas output device includes a second traveling base 5 mounted on a circular track 7. The second traveling base 5 can move circumferentially around the center of the circular track 7. An external seam gas output device is mounted on the second traveling base 5, and the output end of the external seam gas output device is close to the outside of the weld seam to be welded.

[0035] By cooperating with the second traveling base 5, the third traveling base 20 and the welding robotic arm 1, the inner seam welding can be performed after preheating. At the same time as welding, protective gas is introduced into the back of the inner seam, i.e. the outer seam. By cooperating with the first traveling base 24, the third traveling base 20 and the second protective gas output device 9, the outer seam welding can be performed after preheating. At the same time as welding, protective gas is introduced into the back of the outer seam, i.e. the inner seam.

[0036] like Figure 1 As shown, the second protective gas output device 9 includes a traveling mechanism disposed inside the pipe to be welded. The traveling mechanism includes a circumferential traveling mechanism 10 that can move circumferentially inside the pipe to be welded, and an axial traveling mechanism 14 disposed on the circumferential traveling mechanism 10 and that can move axially along the pipe to be welded. An inner seam gas output device is disposed on the axial traveling mechanism 14, and the output end of the inner seam gas output device is close to the inner side of the weld seam to be welded.

[0037] like Figure 1 As shown, the axial traveling mechanism 14 includes a first traveling cylinder 11 that can be fitted inside the pipe 2 to be welded, and a circumferential traveling mechanism 10 is disposed inside the first traveling cylinder 11. A plurality of axial self-driving wheels 15 that can move along the axial direction of the pipe 2 to be welded are arranged on the outer side of the first traveling cylinder 11. The axial self-driving wheels 15 are configured in three groups, and the three groups of axial self-driving wheels 15 are evenly distributed on the outer side of the first traveling cylinder 11.

[0038] The circumferential traveling mechanism 10 includes a second traveling cylinder 12 sleeved inside the first traveling cylinder 11. The second traveling cylinder 12 and the first traveling cylinder 11 are rotatably connected by a bearing 16. A plurality of circumferential self-driving wheels 13 that can move circumferentially along the pipe 2 to be welded are arranged on the outer side of the second traveling cylinder 12. The circumferential self-driving wheels 13 are arranged in three groups, and the three groups of circumferential self-driving wheels 13 are evenly distributed on the outer side of the second traveling cylinder 12. The gas output device for the inner seam is located inside the second traveling cylinder 12.

[0039] Specifically, it should be noted that the first traveling cylinder 11 and the second traveling cylinder 12 are connected by a bearing 16, so that the first traveling cylinder 11 drives the second traveling cylinder 12 to move. The first traveling cylinder 11 moves along its axis in the pipeline to be welded through multiple axial self-driving wheels 15, thereby first driving the second traveling cylinder 12 and the inner seam gas output device located in the second traveling cylinder 12 to the position to be welded. Then, the second traveling cylinder 12 drives itself to move around the circumference of the pipeline 2 to be welded through the circumferential self-driving wheel 13, so that the output end of the inner seam gas output device can follow the movement of the weld point.

[0040] To facilitate the connection of the two pipes 2 to be welded, such as Figure 1 As shown, in this embodiment, two base frames are also provided, each base frame corresponding to one pipe 2 to be welded. The base frame includes a load-bearing plate 19 and guide rollers installed on the load-bearing plate 19. The guide rollers are set in multiple groups and distributed along the axial direction of the pipe 2 to be welded. Each group of guide rollers includes an inclined roller body 17, a horizontal roller body 18 and an inclined roller body 17 distributed in sequence. The pipe 2 to be welded is placed on two inclined roller bodies 17 to facilitate the centering and welding of the two pipes 2 to be welded.

[0041] The preheating device 21 also includes a mounting screw and a threaded cylinder, the lower end of which is rotatably connected to the third traveling base; a screw is mounted on one side of the nozzle, and the screw and the threaded cylinder 30 are threadedly connected to each other to make the distance between the nozzle and the pipe to be welded adjustable.

[0042] Specifically, such as Figure 2 and Figure 4 As shown, when welding a pipe, it is necessary to preheat the positions on both sides of the weld. Therefore, this embodiment provides a preheating device 21, which includes a third traveling base 20 that can move circumferentially along the pipe 2 to be welded on a circular track 7. A heating device is installed on the third traveling base 20. The heating device preheats the pipe 2 to be welded before welding. As welding progresses, the third traveling base 20 moves circumferentially to achieve annular preheating of the pipe 2 to be welded. The heating device includes a nozzle 28 fixed on a third traveling base 20. One end of the nozzle 28 faces the pipe 2 to be welded, and the other end is connected to a combustible gas supply device. The pipe is preheated by igniting the combustible gas sprayed from the nozzle 28. The distance between the nozzle 28 and the pipe 2 to be welded is adjustable. Specifically, a threaded cylinder 30 can be installed on the third traveling base 20, and a screw 29 can be installed on one side of the nozzle 28. The screw 29 and the threaded cylinder 30 are threadedly connected. The lower end of the threaded cylinder 30 is rotatably connected to the third traveling base 20. By holding the screw 29 to prevent it from rotating, the threaded cylinder 30 can be rotated to raise or lower the height of the screw 29, thereby making the distance between the nozzle 28 and the pipe 20 to be welded adjustable.

[0043] The external seam welding mechanism has a first traveling base on a circular track. The first traveling base can move circumferentially around the center of the circular track. An external seam welding gun is mounted on the first traveling base 24.

[0044] In this embodiment, as Figure 2 As shown, the outer seam welding mechanism is used to weld the outer seam of the pipe 2 to be welded, and the inner seam welding mechanism is used to weld the inner seam to be welded. Since the weld to be welded has a ring structure, both the outer seam welding mechanism and the inner seam welding mechanism need to have the ability to rotate around the circumference of the pipe 2 to be welded. Therefore, the outer seam welding mechanism consists of a circular track 7, a first traveling base 24 that can move circumferentially along the circular track 7, and an outer seam welding gun 23 fixed on the first traveling base 24. The circular track 7 is fitted around the outer periphery of the weld to be welded, and the outer seam welding gun 23 is driven by the first traveling base 24 to move circumferentially along the pipe 2 to be welded to achieve the welding of the ring weld. Similarly, in this embodiment, the inner seam welding setup consists of a welding robotic arm 1 and an inner seam welding gun 22. The second end of the welding robotic arm 1 extends into the pipe 2 to be welded and is equipped with the inner seam welding gun 22. The second end of the welding robotic arm 1 here has the ability to rotate independently, so the inner seam welding gun 22 can rotate circumferentially inside the pipe 2 to achieve the welding of the ring weld. To achieve the rotation of the inner seam welding torch 22, a drive motor 25 is provided at the second end of the welding robotic arm 1. The shaft of the drive motor 25 can rotate around a horizontal axis, and the shaft of the drive motor 25 is connected to the inner seam welding torch 22. The welding robotic arm 1 has a multi-stage telescopic structure, and the welding robotic arm 1 drives the inner seam welding torch to perform welding at different depth positions on the pipe 2 to be welded.

[0045] The circular track is formed by splicing two semi-circular tracks. The two ends of the two semi-circular tracks are provided with connecting plates, and the adjacent connecting plates are fixedly connected by bolts.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, the circular track 7 is formed by splicing two semi-circular tracks 7. The two ends of the two semi-circular tracks 7 are provided with connecting plates 6, and the adjacent connecting plates 6 are fixedly connected by bolts.

[0047] Specifically, it should be noted that the two semi-circular tracks 7 form a circular track 7, which allows the two semi-circular tracks 7 to be moved to both sides of the pipe 2 to be welded and connected during welding. Then, the connecting plates 6 on the two semi-circular tracks 7 are bolted together for fixation, which facilitates installation and disassembly.

[0048] The internal seam welding mechanism includes a welding robotic arm. The first end of the welding robotic arm is fixed to the outside of the pipe to be welded, and the second end of the welding robotic arm extends into the pipe to be welded. An internal seam welding gun is provided at the second end of the welding robotic arm. A drive motor is provided at the second end of the welding robotic arm. The shaft of the drive motor can rotate around a horizontal axis, and the shaft of the drive motor is connected to the internal seam welding gun. The welding robotic arm has a multi-stage telescopic structure.

[0049] The first protective gas output device includes a second traveling base mounted on the circular track. The second traveling base can move circumferentially around the center of the circular track. An external seam gas output device is mounted on the second traveling base, with the output end of the external seam gas output device close to the outside of the weld to be welded. The external seam gas output device includes an external seam sealing cover and an external seam gas guide pipe. The lower end of the external seam sealing cover is open and close to the outside of the weld to be welded. The first end of the external seam gas guide pipe is connected to the external seam sealing cover, and the second end is connected to the protective gas supply device.

[0050] Specifically, since shielding gas needs to be introduced to the other side of the weld during welding, the welding device is equipped with a first shielding gas output device and a second shielding gas output device 9. The first shielding gas output device is used to introduce shielding gas when welding the inner seam, while the second shielding gas output device 9 is used to introduce shielding gas when welding the outer seam. More specifically, the first shielding gas output device consists of a second traveling base 5 that can move on a circular track 7 and an outer seam gas output device. The second shielding gas output device 9 consists of an axial traveling mechanism 14 that can move along the axial direction of the pipe to be welded and a circumferential traveling mechanism 10 that can move along its circumference, as well as an inner seam gas output device. That is, when welding the inner seam of the pipe 2 to be welded, the second traveling base 5 moves circumferentially on the circular track 7 simultaneously, driving the outer seam gas output device to move circumferentially along the weld seam, cooperating with the inner seam welding torch 22 to introduce shielding gas at the weld point. Similarly, when welding the outer seam of the pipe 2 to be welded, the axial travel mechanism 14 moves the circumferential travel mechanism 10 and the inner seam gas output device to the designated position. Then, the circumferential travel mechanism 10 drives the inner seam gas output device to move circumferentially along the weld seam to be welded, and cooperates with the outer seam welding torch 23 to introduce protective gas at the weld point.

[0051] like Figures 1 to 4 As shown, the external seam gas output device includes an external seam sealing cover 4 and an external seam gas guide pipe. The lower end of the external seam sealing cover 4 is open and close to the outside of the weld to be welded. The first end of the external seam gas guide pipe is connected to the external seam sealing cover 4, and the second end is connected to the protective gas supply device.

[0052] Specifically, it should be noted that when the outer seam gas output device moves to the weld seam, the protective gas supply device is turned on, and the protective gas flows through the outer seam gas guide pipe to the outer seam sealing cover 4. Since the outer seam sealing cover 4 is close to the outside of the weld seam to be welded, the weld seam can be filled with protective gas during welding.

[0053] This embodiment achieves the goal of simultaneously injecting protective gas close to the welding point during welding, and the welding of both the outer and inner seams of the pipeline is carried out by automatic welding equipment. This simplifies the operation of injecting protective gas during welding, improves the uniformity of the weld points of the outer and inner seams, and increases the welding efficiency. It also solves the problems in related technologies where the injection of protective gas during welding is cumbersome, the welding efficiency of the outer and inner seams of the pipeline is low, and the weld point distribution is uneven.

[0054] The external seam gas output device further includes a length adjustment mechanism. The fixed part of the length adjustment mechanism is fixed to the second traveling base, and the movable part of the length adjustment mechanism is connected to the external seam sealing cover. The fixed part of the length adjustment mechanism is a fixed sleeve fixed to the second traveling base, and the movable part of the length adjustment mechanism is a slider, a spring, and an adjusting screw disposed within the fixed sleeve. The fixed sleeve is arranged along the circumference of the pipe to be welded, and the slider is slidably disposed within the fixed sleeve. The fixed sleeve has strip-shaped adjusting grooves on both sides, and the adjusting screw passes through the adjusting grooves and can move up and down within the adjusting grooves. A fixing nut is threaded onto the adjusting screw, and the adjusting screw is located above the slider. The upper end of the external seam sealing cover is inserted into the fixed sleeve and slidably connected. The first end of the spring is connected to the slider, and the second end is connected to the upper end of the external seam sealing cover.

[0055] Specifically, such as Figure 2 As shown, the external seam gas output device also includes a length adjustment mechanism 27. The fixed part of the length adjustment mechanism 27 is fixed on the second traveling base 5, and the movable part of the length adjustment mechanism 27 is connected to the external seam sealing cover 4.

[0056] Specifically, it should be noted that since the diameters of the pipes 2 to be welded vary, a length adjustment mechanism 27 is added to make the outer seam sealing cover 4 adaptable to pipes 2 of different diameters. By adjusting the movement of the length adjustment mechanism 27, the distance between the outer seam sealing cover 4 and the weld seam to be welded can be adjusted, thereby adapting to pipes 2 of different diameters.

[0057] Furthermore, such as Figure 3As shown, the fixed part of the length adjustment mechanism 27 is a fixed sleeve 275 fixed on the second traveling base 5, and the movable part of the length adjustment mechanism 27 is a slider 274, a spring 271 and an adjusting screw 273 provided in the fixed sleeve 275. The fixed sleeve 275 is arranged along the circumference of the pipe 2 to be welded, and the slider 274 is slidably disposed in the fixed sleeve 275. The fixed sleeve 275 has strip-shaped adjusting grooves 272 on both sides, and the adjusting screw 273 passes through the adjusting grooves 272 and can move up and down in the adjusting grooves 272. A fixing nut is threaded on the adjusting screw 273, and the adjusting screw 273 is located above the slider 274.

[0058] The upper end of the outer seam sealing cover 4 is inserted into the fixed sleeve 275 and slidably connected. The first end of the spring 271 is connected to the slider 274, and the second end is connected to the upper end of the outer seam sealing cover 4.

[0059] Specifically, it should be noted that the length adjustment mechanism 27 consists of a fixed sleeve 275, a slider 274, a spring 271, and an adjusting screw 273. The adjusting screw 273 can slide up and down within the two adjusting slots 272 of the fixed sleeve 275 and can be fixed by a fixing nut. The slider 274 is located below the adjusting screw 273. Therefore, by moving the adjusting screw 273 downward, the slider 274 moves downward, pushing the spring 271. Since the lower end of the spring 271 is connected to the upper end of the outer seam sealing cover 4, the spring 271 pushes the outer seam sealing cover 4 downward. Due to the presence of the spring 271, a certain preload can be applied to the outer seam sealing cover 4, allowing it to fit tightly against the outside of the pipe 2 to be welded. The outer seam sealing cover 4 is funnel-shaped, with its opening end larger than the weld seam to be welded.

[0060] The second protective gas output device includes a traveling mechanism disposed within the pipe to be welded. The traveling mechanism includes a circumferential traveling mechanism that can move circumferentially within the pipe to be welded, and an axial traveling mechanism disposed on the circumferential traveling mechanism that can move axially along the pipe to be welded. An inner seam gas output device is disposed on the axial traveling mechanism, and the output end of the inner seam gas output device is close to the inner side of the weld to be welded. The inner seam gas output device includes an inner seam sealing cover and an inner seam gas guide pipe. The lower end of the inner seam sealing cover is open and close to the inner side of the weld to be welded. The first end of the inner seam gas guide pipe is connected to the inner seam sealing cover through a spring tube, and the second end is connected to the protective gas supply device.

[0061] Specifically, such as Figure 1 and Figure 3 As shown, the second protective gas output device 9 and the inner seam welding mechanism are located on the left and right sides of the weld to be welded, respectively. Specifically, such as Figure 1 and Figure 3As shown, the inner seam gas output device includes an inner seam sealing cover 26 and an inner seam gas guide pipe. The lower end of the inner seam sealing cover 26 is open and close to the inner side of the weld to be welded. The first end of the inner seam gas guide pipe is connected to the inner seam sealing cover 26 through a spring tube, and the second end is connected to the protective gas supply device. In this embodiment, the structure of the inner seam gas output device is similar to that of the outer seam gas output device. The inner seam sealing cover 26 applies pre-tightening force through a spring tube. Here, the spring tube can be made of a metal expansion joint with telescopic function. The inner seam sealing cover 26 is also funnel-shaped.

[0062] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The pipe annular weld preheating welding mechanism of this embodiment also includes a control system, which includes an outer seam light tracking controller and an inner seam light tracking controller; the outer seam light tracking controller is disposed on the second traveling base, and the monitoring end of the outer seam light tracking controller is used to monitor the weld point that generates light during welding of the weld seam to be welded, and feeds the signal back to the control system; the inner seam light tracking controller is disposed on the second traveling cylinder, and the monitoring end of the inner seam light tracking controller is used to monitor the weld point that generates light during welding of the weld seam to be welded, and feeds the signal back to the control system; 2) The control system is electrically connected to the circumferential self-driving wheel so that the circumferential self-driving wheel drives the inner seam sealing cover to follow the welding point on the inside of the pipe to be welded.

[0063] 3) The control system is electrically connected to the walking part of the second walking base so that the second walking base drives the outer seam sealing cover to follow the welding point on the outside of the pipe to be welded.

[0064] like Figures 1 to 4 As shown, it also includes a control system. The external seam gas output device also includes an external seam light tracking controller 3. The external seam light tracking controller 3 is mounted on the second walking base 5. The monitoring end of the external seam light tracking controller 3 is used to monitor the weld point where the weld seam to be welded generates light during welding and to feed the signal back to the control system. The control system is electrically connected to the traveling part of the second traveling base 5, so that the second traveling base 5 drives the outer seam sealing cover 4 to follow the weld point on the outside of the pipe 2 to be welded. The control system is electrically connected to the circumferential self-driving wheel 13, so that the circumferential self-driving wheel 13 drives the inner seam sealing cover 26 to follow the weld point on the inside of the pipe 2 to be welded.

[0065] The following control schemes are not within the scope of the claims, but are only examples of schemes that can be adopted in practical applications.

[0066] During the external seam welding process, the external seam light tracking controller 3 collects the position of the external seam weld point in real time. When the weld point moves circumferentially, it feeds the signal back to the control system. The control system can control the circumferential self-driving wheel 13 to drive the external seam sealing cover 4 to follow the weld point in the pipe 2 to be welded, so that the output end of the inner seam sealing cover 26 is always facing the weld point to complete the anti-oxidation protection of the back of the weld. The inner seam light tracking controller 8 can be a laser weld seam tracker.

[0067] The inner seam gas output device also includes an inner seam light tracking controller 8, which is mounted on the second traveling cylinder 12. The monitoring end of the inner seam light tracking controller 8 is used to monitor the weld point where the weld seam to be welded generates light during welding and to feed the signal back to the control system. Specifically, it should be noted that during the inner seam welding process, the inner seam light tracking controller 8 collects the position of the inner seam weld point in real time. When the weld point moves circumferentially, it feeds the signal back to the control system. The control system can control the second traveling base 5 to drive the outer seam sealing cover 4 to follow the weld point circumferentially on the outside of the pipe 2 to be welded, so that the output end of the outer seam sealing cover 4 is always facing the weld point to complete the anti-oxidation protection of the back of the weld. The outer seam light tracking controller 3 can be a laser weld tracker.

[0068] The inner seam gas output device also includes an inner seam light tracking controller, which is mounted on the second traveling cylinder. The monitoring end of the inner seam light tracking controller is used to monitor the weld point where light is generated during welding of the weld seam to be welded, and to feed the signal back to the control system.

[0069] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A preheating welding mechanism for a pipe circumferential weld, characterized in that, The system includes an outer seam welding mechanism, an inner seam welding mechanism, a first protective gas output device, a second protective gas output device (9), and a preheating device (21). The outer seam welding mechanism is arranged around the circumference of the pipe (2) to be welded and includes a circular track (7) fitted on the pipe (2) to be welded, so as to realize movement along the outer seam circumferentially. The inner seam welding mechanism extends into the pipe (2) to be welded and is used to move and weld the inner seam. The preheating device (21) includes a third traveling base (20) set on the circular track (7) and a heating device set on the third traveling base (20). The heating device includes a nozzle (28) connected to a combustible gas supply device to spray combustion gas to achieve preheating. The first protective gas output device and the second protective gas output device (9) are respectively set in conjunction with the outer seam welding mechanism and the inner seam welding mechanism to supply protective gas.

2. The pipe circumferential weld preheating welding mechanism according to claim 1, characterized in that, The preheating device (21) also includes a mounting screw (29) and a threaded cylinder, the lower end of which is rotatably connected to the third traveling base (20); a screw (29) is mounted on one side of the nozzle (28), and the screw (29) is connected to the threaded cylinder to achieve an adjustable distance between the nozzle (28) and the pipe (2) to be welded.

3. The pipe circumferential weld preheating welding mechanism according to claim 1, characterized in that, The circular track (7) is provided with a first traveling base (24), which can move circumferentially around the center of the circular track (7). The first traveling base (24) is provided with an outer seam welding gun (23).

4. The pipe circumferential weld preheating welding mechanism according to claim 3, characterized in that, The circular track (7) is formed by splicing two semi-circular tracks (7). The two ends of the two semi-circular tracks (7) are provided with connecting plates (6), and the adjacent connecting plates (6) are fixedly connected by bolts.

5. The pipe circumferential weld preheating welding mechanism according to claim 1, characterized in that, The inner seam welding mechanism includes a welding robotic arm (1), which is a multi-stage telescopic structure. The first end of the welding robotic arm (1) is fixed to the outside of the pipe (2) to be welded, and the second end of the welding robotic arm (1) extends into the pipe (2) to be welded. An inner seam welding gun (22) is provided at the second end of the welding robotic arm (1). A drive motor (25) is provided at the second end of the welding robotic arm (1). The shaft of the drive motor (25) can rotate around a horizontal axis, and the shaft of the drive motor (25) is connected to the inner seam welding gun (22).

6. The pipe circumferential weld preheating welding mechanism according to claim 1, characterized in that, The first protective gas output device includes a second traveling base (5) disposed on the circular track (7). The second traveling base (5) can move circumferentially around the center of the circular track (7). An external seam gas output device is disposed on the second traveling base (5). The output end of the external seam gas output device is close to the outside of the weld to be welded. The external seam gas output device includes an external seam sealing cover (4) and an external seam gas guide pipe. The lower end of the external seam sealing cover (4) is open and close to the outside of the weld to be welded. The first end of the external seam gas guide pipe is connected to the external seam sealing cover (4), and the second end is connected to the protective gas supply device.

7. A preheating welding mechanism for pipe annular welds according to claim 6, characterized in that, The external seam gas output device also includes a length adjustment mechanism (27) for adjusting the distance between the external seam sealing cover (4) and the weld to be welded; the fixed part of the length adjustment mechanism (27) is a fixed sleeve (275) fixed on the second walking base (5); the movable part of the length adjustment mechanism (27) includes a slider (274), a spring (271) and an adjusting screw (273) disposed in the fixed sleeve (275), and the movable part is connected to the external seam sealing cover (4).

8. The pipe circumferential weld preheating welding mechanism according to claim 1, characterized in that, The second protective gas output device (9) includes a traveling mechanism disposed in the pipe (2) to be welded. The traveling mechanism includes a circumferential traveling mechanism (10) that can move circumferentially in the pipe (2) to be welded, and an axial traveling mechanism (14) disposed on the circumferential traveling mechanism (10) and that can move axially along the pipe (2) to be welded. An inner seam gas output device is disposed on the axial traveling mechanism (14).

9. A preheating welding mechanism for pipe annular welds according to claim 1, characterized in that, It also includes a control system, which includes an outer seam light tracking controller (3) and an inner seam light tracking controller (8); the outer seam light tracking controller (3) and the inner seam light tracking controller (8) are respectively installed on the first protective gas output device and the second protective gas output device (9); the monitoring ends of the outer seam light tracking controller (3) and the inner seam light tracking controller (8) are respectively used to monitor the weld points where the weld seam to be welded generates light during welding, and feed the signals back to the control system; The control system is electrically connected to the first protective gas output device and the second protective gas output device (9) respectively, so that the first protective gas output device and the second protective gas output device (9) follow the welding point on the outside of the pipe (2) to be welded.

10. A preheating welding mechanism for a pipe circumferential weld according to claim 1, characterized in that, It also includes two base frames, each base frame corresponding to a pipe (2) to be welded. The base frame includes a load-bearing plate (19) and guide rollers installed on the load-bearing plate (19). The guide rollers are set in multiple groups and distributed along the axial direction of the pipe (2) to be welded. Each group of guide rollers includes an inclined roller body (17), a horizontal roller body (18) and an inclined roller body (17) distributed in sequence. The pipe (2) to be welded is placed on two inclined roller bodies (17).

Images