An auxiliary welding device for gas pipelines

Abstract

This utility model relates to an auxiliary welding device for gas pipelines, comprising a rotating shaft, a first external thread, a first bearing, a first nut, three first connecting rods, three second connecting rods, three pipe inner support plates, a bushing, a second external thread, a second bearing, a second nut, three third connecting rods, three fourth connecting rods, and three flat welding flange plates. This utility model internally supports and fixes the natural gas pipeline and the flat welding flange using the pipe inner support assembly and the flat welding flange inner support assembly, respectively. Since the pipe inner support assembly and the flat welding flange inner support assembly are coaxial, the fixed natural gas pipeline and the flat welding flange are also coaxial, which helps to improve the alignment accuracy of the natural gas pipeline and the flat welding flange, and improves the welding quality.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, and in particular to an auxiliary welding device for gas pipelines. Background Technology

[0002] Natural gas pipelines are pipelines that transport natural gas (including associated gas from oil fields) from extraction sites or processing plants to urban gas distribution centers or industrial users; they are also called gas transmission pipelines. Transporting natural gas via pipelines is the primary method for large-scale onshore natural gas transportation. Natural gas pipelines account for approximately half of the world's total pipeline length. Gas transmission pipelines are assembled by connecting individual pipes one by one. Modern gas gathering and transmission pipelines require flanges to be welded to the connection ends.

[0003] Slip-on flanges are particularly suitable for low-pressure pipeline systems such as natural gas pipelines due to their ease of installation and cost-effectiveness. Therefore, natural gas pipelines typically use slip-on flanges. The installation process is relatively simple; the flange is simply slid into the end of the pipe and then secured by welding. Because its inner diameter is similar to the outer diameter of the pipe, the installation process is relatively straightforward.

[0004] However, there is a gap between the outer diameter of the natural gas pipeline and the inner diameter of the flat-face welding flange, making it difficult to align the centerline of the natural gas pipeline with the centerline of the flat-face welding flange during welding, which affects the welding quality. Utility Model Content

[0005] This utility model provides an auxiliary welding device for gas pipelines, which can solve the problem in the prior art where there is a gap between the outer diameter of the natural gas pipeline and the inner diameter of the flat welding flange, making it difficult to align the central axis of the natural gas pipeline with the central axis of the flat welding flange during welding, thus affecting the welding quality.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: an auxiliary welding device for gas pipelines, comprising:

[0007] Pipeline internal support assembly, the pipeline internal support assembly being used to secure the natural gas pipeline from the inside;

[0008] The pipe internal support assembly includes a rotating shaft, a first external thread, a first bearing, a first nut, three first connecting rods, three second connecting rods, and three pipe internal support plates. The first external thread is located in the middle of the rotating shaft. The first bearing is rotatably connected to the left end of the rotating shaft. The first nut is threaded onto the first external thread. The three first connecting rods, the three second connecting rods, and the three pipe internal support plates correspond one-to-one. The two ends of the first connecting rod are respectively hinged to the first bearing and the corresponding pipe internal support plate. The two ends of the second connecting rod are respectively hinged to the first nut and the corresponding pipe internal support plate. The middle part of the first connecting rod is hinged to the middle part of the corresponding second connecting rod.

[0009] An inner support assembly for a flat-faced welding flange, wherein the inner support assembly is used to fix the flat-faced welding flange from the inside of the flat-faced welding flange;

[0010] The flat-face flange includes a bushing, a second external thread, a second bearing, a second nut, three third connecting rods, three fourth connecting rods, and three flat-face flange plates. The bushing is fitted onto the right end of the rotating shaft. The first external thread is located on the outer surface of the bushing. The second bearing is located on the left end of the bushing. The second nut is threaded onto the second external thread. The three third connecting rods, the three fourth connecting rods, and the three flat-face flange plates correspond one-to-one. The two ends of the third connecting rod are respectively hinged to the second bearing and the corresponding flat-face flange plate. The two ends of the fourth connecting rod are respectively hinged to the second nut and the corresponding flat-face flange plate. The middle part of the third connecting rod is hinged to the middle part of the corresponding fourth connecting rod.

[0011] Preferably, the bushing has an annular groove located on the right side of the second bearing, a connecting piece is provided between the first nut and the second bearing, and a follower plate inserted into the annular groove is provided at the right end of the connecting piece.

[0012] Preferably, it further includes a guide groove, on which a trapezoidal lead screw is rotatably connected. The upper end of the trapezoidal lead screw extends from the top of the guide groove and is fixedly connected to a first knob. Two lead screw nuts that are threadedly connected to the trapezoidal lead screw are slidably connected inside the guide groove. A top rod is provided on the lead screw nut. The right end of the rotating shaft is rotatably connected to the guide groove. The two lead screw nuts are symmetrically arranged about the rotating shaft.

[0013] Preferably, a top plate is slidably connected to the top rod, and a telescopic device is provided on the lead screw nut, with its telescopic end fixedly connected to the top plate.

[0014] Preferably, the telescopic device is a cylinder, a hydraulic rod, or an electric push rod.

[0015] Preferably, it also includes a base plate disposed at the lower end of the guide groove, and a reinforcing rib is provided between the base plate and the side wall of the guide groove.

[0016] Preferably, a second knob is provided on the rotating shaft, and a third knob is provided on the bushing.

[0017] Compared to existing technologies, this utility model, through the coordinated arrangement of a rotating shaft, a first external thread, a first bearing, a first nut, three first connecting rods, three second connecting rods, three pipe inner support plates, a bushing, a second external thread, a second bearing, a second nut, three third connecting rods, three fourth connecting rods, and three flat-welded flange plates, allows for efficient welding of natural gas pipelines to flat-welded flanges. After the natural gas pipeline is fitted onto the pipe inner support assembly, one hand holds the assembly to prevent the first nut from rotating synchronously with the rotating shaft, while the other hand rotates the shaft. This causes the first external thread to move the first nut closer to the first bearing, and the first and second connecting rods to move the pipe inner support plates away from the rotating shaft. The flange is fixed by contacting the inner wall of the natural gas pipeline. Then, the flat-faced flange is fitted onto the welded end of the natural gas pipeline, with part of it protruding from the welded end. One hand holds the inner support assembly of the flat-faced flange to prevent the second nut from rotating synchronously with the bushing. The other hand rotates the bushing, causing the second external thread to drive the second nut closer to the second bearing. The third and fourth connecting rods drive the flat-faced flange away from the bushing until it contacts the inner wall of the flat-faced flange and is fixed. Since the bushing and the rotating shaft are coaxial, the fixed natural gas pipeline and the flat-faced flange are also coaxial, which helps to improve the alignment accuracy of the natural gas pipeline and the flat-faced flange and improve the welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the main sectional view of the guide groove of this utility model;

[0020] Figure 3 This is a schematic diagram of the main structure of the natural gas pipeline and the flat welding flange of this utility model.

[0021] Figure 4 This is a schematic diagram of the bushing structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the connecting piece structure of this utility model.

[0023] In the diagram: 1. Shaft; 2. First external thread; 3. First bearing; 4. First nut; 5. First connecting rod; 6. Second connecting rod; 7. Pipeline inner support plate; 8. Bushing; 9. Second external thread; 10. Second bearing; 11. Second nut; 12. Third connecting rod; 13. Fourth connecting rod; 14. Flat-welded flange plate; 15. Annular groove; 16. Connecting piece; 17. Follower plate; 18. Guide groove; 19. Trapezoidal lead screw; 20. First knob; 21. Lead screw nut; 22. Top rod; 23. Top plate; 24. Telescopic device; 25. Base plate; 26. Reinforcing rib; 27. Natural gas pipeline; 28. Flat-welded flange; 29. ​​Second knob; 30. Third knob. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1-5 As shown, an auxiliary welding device for gas pipelines includes:

[0026] Pipeline internal support assembly, the pipeline internal support assembly being used to secure the natural gas pipeline 27 from the inside of the natural gas pipeline;

[0027] The pipe internal support assembly includes a rotating shaft 1, a first external thread 2, a first bearing 3, a first nut 4, three first connecting rods 5, three second connecting rods 6, and three pipe internal support plates 7. The first external thread 2 is located in the middle of the rotating shaft 1. The first bearing 3 is rotatably connected to the left end of the rotating shaft 1. The first nut 4 is threaded onto the first external thread 2. The three first connecting rods 5, the three second connecting rods 6, and the three pipe internal support plates 7 correspond one-to-one. The two ends of the first connecting rod 5 are respectively hinged to the first bearing 3 and the corresponding pipe internal support plate 7. The two ends of the second connecting rod 6 are respectively hinged to the first nut 4 and the corresponding pipe internal support plate 7. The middle part of the first connecting rod 5 is hinged to the middle part of the corresponding second connecting rod 6.

[0028] The inner support assembly for the slip-on flange is used to secure the slip-on flange 28 from the inside.

[0029] The flat-face flange includes a bushing 8, a second external thread 9, a second bearing 10, a second nut 11, three third connecting rods 12, three fourth connecting rods 13, and three flat-face flange plates 14. The bushing 8 is fitted onto the right end of the rotating shaft 1. The first external thread 2 is provided on the outer surface of the bushing 8. The second bearing 10 is provided on the left end of the bushing 8. The second nut 11 is threaded onto the second external thread 9. The three third connecting rods 12, the three fourth connecting rods 13, and the three flat-face flange plates 14 correspond one-to-one. The two ends of the third connecting rod 12 are respectively hinged to the second bearing 10 and the corresponding flat-face flange plate 14. The two ends of the fourth connecting rod 13 are respectively hinged to the second nut 11 and the corresponding flat-face flange plate 14. The middle part of the third connecting rod 12 is hinged to the middle part of the corresponding fourth connecting rod 13.

[0030] When welding the natural gas pipeline 27 to the flat-face flange 28, after fitting the natural gas pipeline 27 onto the pipeline inner support assembly, hold the pipeline inner support assembly with one hand to prevent the first nut 4 from rotating synchronously with the rotating shaft 1, and rotate the rotating shaft 1 with the other hand. This causes the first external thread 2 to drive the first nut 4 closer to the first bearing 3. The first connecting rod 5 and the second connecting rod 6 drive the pipeline inner support plate 7 away from the rotating shaft 1 until it abuts against the inner wall of the natural gas pipeline 27 and fixes it in place. Then, fit the flat-face flange 28 onto the welded end of the natural gas pipeline 27, making a portion of it protrude from the welded end of the natural gas pipeline 27. Hold the inner support assembly of the flat welding flange with one hand to prevent the second nut 11 from rotating synchronously with the bushing 8. With the other hand, rotate the bushing 8 so that the second external thread 9 drives the second nut 11 closer to the second bearing 10. The third connecting rod 12 and the fourth connecting rod 13 drive the flat welding flange plate 14 away from the bushing 8 until it abuts against the inner wall of the flat welding flange 28 and fixes it. Make the central axis of the fixed natural gas pipeline 27 coincide with the central axis of the fixed flat welding flange 28. Weld the natural gas pipeline 27 and the flat welding flange 28. Rotate the bushing 8 and the rotating shaft 1 in the direction of rotation to remove the auxiliary welding device.

[0031] Preferably, the bushing 8 has an annular groove 15 located on the right side of the second bearing 10, and a connecting piece 16 is provided between the first nut 4 and the second bearing 10. The right end of the connecting piece 16 is provided with a follower plate 17 that is inserted into the annular groove 15.

[0032] Specifically, during the process of the first nut 4 approaching the first bearing 3 to internally support and fix the natural gas pipeline 27, the first nut 4 will drive the follower plate 17 to move synchronously through the connecting piece 16. The follower plate 17 will drive the flat welding flange internal support assembly to move synchronously through the annular groove 15. On the one hand, it can keep the pipeline internal support assembly and the flat welding flange internal support assembly connected together. On the other hand, it can keep the distance between the pipeline internal support assembly and the flat welding flange internal support assembly unchanged, which is convenient to use.

[0033] To improve welding quality, preferably, the system also includes a guide groove 18, on which a trapezoidal lead screw 19 is rotatably connected. The upper end of the trapezoidal lead screw 19 extends from the top of the guide groove 18 and is fixedly connected to a first knob 20. Inside the guide groove 18, two lead screw nuts 21 are slidably connected to the trapezoidal lead screw 19. A top rod 22 is provided on the lead screw nut 21. The right end of the rotating shaft 1 is rotatably connected to the guide groove 18. The two lead screw nuts 21 are symmetrically arranged about the rotating shaft 1. A top plate 23 is slidably connected to the top rod 22. A telescopic device 24 is provided on the lead screw nut 21, with its telescopic end fixedly connected to the top plate 23. The telescopic device 24 is a cylinder, a hydraulic rod, or an electric push rod.

[0034] Specifically, by adjusting the extension distance of the telescopic device 24, the protrusion distance of the flat-welded flange 28 from the welding end of the natural gas pipeline 27 is adjusted, thereby ensuring welding quality. In specific operation, the extension distance of the telescopic device 24 is adjusted according to welding requirements. The natural gas pipeline 27 is fitted onto the pipeline inner support assembly, and the welding end of the natural gas pipeline 27 is brought into contact with the top rod 22. One hand holds the pipeline inner support assembly to prevent the first nut 4 from rotating synchronously with the rotating shaft 1, while the other hand rotates the rotating shaft 1. This causes the first external thread 2 to drive the first nut 4 closer to the first bearing 3. The first connecting rod 5 and the second connecting rod 6 drive the pipeline inner support plate 7 away from the rotating shaft 1 until it abuts against the inner wall of the natural gas pipeline 27 and fixes it. Then, the flat-welded flange 28 is fitted onto the welding end of the natural gas pipeline 27 and brought into contact with the top rod 22. The second nut 11 is held in place by the top plate 23. One hand holds the inner support assembly of the flat welding flange to prevent the second nut 11 from rotating synchronously with the bushing 8. The other hand rotates the bushing 8 so that the second external thread 9 drives the second nut 11 closer to the second bearing 10. The third connecting rod 12 and the fourth connecting rod 13 drive the flat welding flange plate 14 away from the bushing 8 until it abuts against the inner wall of the flat welding flange 28 and fixes it. The central axis of the fixed natural gas pipeline 27 coincides with the central axis of the fixed flat welding flange 28. The natural gas pipeline 27 and the flat welding flange 28 are welded. The bushing 8 and the rotating shaft 1 are rotated in the direction to remove the auxiliary welding device.

[0035] Preferably, it also includes a base plate 25 disposed at the lower end of the guide groove 18, and a reinforcing rib 26 is provided between the base plate 25 and the side wall of the guide groove 18.

[0036] Preferably, a second knob 29 is provided on the rotating shaft 1, and a third knob 30 is provided on the bushing 8.

[0037] Compared to existing technologies, this utility model, through the coordinated arrangement of a rotating shaft 1, a first external thread 2, a first bearing 3, a first nut 4, three first connecting rods 5, three second connecting rods 6, three pipe inner support plates 7, a bushing 8, a second external thread 9, a second bearing 10, a second nut 11, three third connecting rods 12, three fourth connecting rods 13, and three flat-welded flange plates 14, allows for efficient welding of the natural gas pipeline 27 to the flat-welded flange 28. After the natural gas pipeline 27 is fitted onto the pipe inner support assembly, one hand holds the assembly to prevent the first nut 4 from rotating synchronously with the rotating shaft 1, while the other hand rotates the rotating shaft 1. This causes the first external thread 2 to move the first nut 4 closer to the first bearing 3, and the first connecting rods 5 and second connecting rods 6 to move the pipe inner support plates 7 away from the rotating shaft 1. The flange is fixed by contacting the inner wall of the natural gas pipeline 27. Then, the flat-faced flange 28 is fitted onto the welded end of the natural gas pipeline 27, with part of it protruding from the welded end. One hand holds the inner support assembly of the flat-faced flange to prevent the second nut 11 from rotating synchronously with the bushing 8. The other hand rotates the bushing 8, causing the second external thread 9 to drive the second nut 11 closer to the second bearing 10. The third connecting rod 12 and the fourth connecting rod 13 drive the flat-faced flange plate 14 away from the bushing 8 until it contacts the inner wall of the flat-faced flange 28 and is fixed. Since the bushing 8 and the rotating shaft 1 are coaxial, the fixed natural gas pipeline 27 and the flat-faced flange 28 are also coaxial, which helps to improve the alignment accuracy of the natural gas pipeline 27 and the flat-faced flange 28 and improve the welding quality.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary welding device for a gas pipe, characterized in that include: Pipeline internal support assembly, the pipeline internal support assembly being used to secure the natural gas pipeline (27) from the inside of the natural gas pipeline; The pipe internal support assembly includes a rotating shaft (1), a first external thread (2), a first bearing (3), a first nut (4), three first connecting rods (5), three second connecting rods (6), and three pipe internal support plates (7). The first external thread (2) is located in the middle of the rotating shaft (1). The first bearing (3) is rotatably connected to the left end of the rotating shaft (1). The first nut (4) is threaded onto the first external thread (2). The three first connecting rods (5), the three second connecting rods (6), and the three pipe internal support plates (7) correspond one-to-one. The two ends of the first connecting rod (5) are respectively hinged to the first bearing (3) and the corresponding pipe internal support plate (7). The two ends of the second connecting rod (6) are respectively hinged to the first nut (4) and the corresponding pipe internal support plate (7). The middle part of the first connecting rod (5) is hinged to the middle part of the corresponding second connecting rod (6). An inner support assembly for a flat-faced flange, the inner support assembly for securing the flat-faced flange (28) from the inside of the flat-faced flange; The flat-welded flange includes a bushing (8), a second external thread (9), a second bearing (10), a second nut (11), three third connecting rods (12), three fourth connecting rods (13), and three flat-welded flange plates (14). The bushing (8) is fitted on the right end of the rotating shaft (1). The first external thread (2) is set on the outer surface of the bushing (8). The second bearing (10) is set on the left end of the bushing (8). The second nut (11) is threaded onto the second external thread (9). The three third connecting rods (12), the three fourth connecting rods (13), and the three flat-welded flange plates (14) correspond one-to-one. The two ends of the third connecting rod (12) are respectively hinged to the second bearing (10) and the corresponding flat-welded flange plate (14). The two ends of the fourth connecting rod (13) are respectively hinged to the second nut (11) and the corresponding flat-welded flange plate (14). The middle part of the third connecting rod (12) is hinged to the middle part of the corresponding fourth connecting rod (13).

2. Auxiliary welding device for gas pipes according to claim 1, characterized in that: The bushing (8) has an annular groove (15) located on the right side of the second bearing (10). A connecting piece (16) is provided between the first nut (4) and the second bearing (10). A follower plate (17) that is inserted into the annular groove (15) is provided at the right end of the connecting piece (16).

3. Auxiliary welding device for gas pipes according to claim 1, characterized in that: It also includes a guide groove (18), on which a trapezoidal lead screw (19) is rotatably connected. The upper end of the trapezoidal lead screw (19) extends from the top of the guide groove (18) and is fixedly connected to a first knob (20). Inside the guide groove (18), two lead screw nuts (21) are slidably connected to the trapezoidal lead screw (19) and threadedly connected. A top rod (22) is provided on the lead screw nut (21). The right end of the rotating shaft (1) is rotatably connected to the guide groove (18). The two lead screw nuts (21) are symmetrically arranged about the rotating shaft (1).

4. Auxiliary welding device for gas pipes according to claim 3, characterized in that: A top plate (23) is slidably connected to the top rod (22), and a telescopic device (24) is provided on the screw nut (21) with its telescopic end fixedly connected to the top plate (23).

5. Auxiliary welding device for gas pipes according to claim 4, characterized in that: The telescopic device (24) is a cylinder, a hydraulic rod, or an electric push rod.

6. The auxiliary welding device for gas pipelines according to claim 3, characterized in that: It also includes a base plate (25) disposed at the lower end of the guide groove (18), and a reinforcing rib (26) is provided between the base plate (25) and the side wall of the guide groove (18).

7. The auxiliary welding device for gas pipes according to claim 1, characterized in that: A second knob (29) is provided on the rotating shaft (1), and a third knob (30) is provided on the bushing (8).

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