An extension support for internal welding of a pipe body

Abstract

This application discloses an extension bracket for internal welding of a pipe. The extension bracket is mounted on a welding machine and parallel to its horizontal sliding platform. The pipe to be welded is placed on the platform. As the pipe slides along the platform, the extension bracket extends into the pipe from one end and out from the other. A welding torch is mounted on the extension bracket, positioned close to the weld seam inside the pipe. This extension bracket, mounted on the welding machine, can be fitted with a manual welding torch. Utilizing the horizontal length of the extension bracket, the welding torch can be inserted into the pipe to perform straight-line welding of the internal weld seam, thus quickly completing the repair welding operation of the internal weld seam, ensuring the pressure-bearing capacity of the pipe, and simultaneously solving the problem of excessive subsequent grinding on the outer surface due to increased weld material applied from the outer surface. The use of rollers ensures that the welding torch head maintains a certain distance from the weld seam during welding, improving the quality of the internal weld.

Description

Technical Field

[0001] This application relates to the field of pipe welding and forming technology, and in particular to an extension bracket for internal welding of pipes. Background Technology

[0002] Pipelines are mainly used to transport fluids (gas, liquid, etc.) or solid particles. Their applications are extremely wide, covering almost all fields such as industry, agriculture, and civil use, such as crude oil and refined oil transportation in petrochemical industry, cooling water pipelines, and gas transportation.

[0003] Currently, the main forming methods for metal pipes include welding, seamless hot rolling, cold drawing (rolling), and forging. Welding, compared to other forming methods, is simpler and more efficient, and is widely used in pipe forming. The main method of welding involves cutting a metal sheet, rolling it into a tubular shape, and then welding the connecting edges together (e.g.,...). Figure 1 As shown in the figure, the tube body can be formed. The operation method is simple and the processing is quick.

[0004] Currently, when welding pipes after rolling, a welding machine is typically used to perform straight welding at the weld seam on the outer surface of the pipe. Usually, the weld fills the weld seam, ensuring the pipe's compressive strength. However, for industries with high pressure requirements, welding from the outer surface of the pipe cannot guarantee that the weld seam will be completely filled, which may result in issues such as… Figure 4 The insufficient filler metal at the weld seam inside the pipe body, as shown, affects the pipe's pressure resistance. For longer pipes, conventional welding machines are limited in their ability to weld inside the pipe, and manual welding with a welding torch also suffers from limited visibility, making it difficult to ensure the weld quality inside the pipe. Therefore, surface welding remains the primary method. Even with increased filler metal in surface welding to fully fill the weld seam inside, the filler metal at the weld seam on the outer surface of the pipe body also increases, leading to an increase in the amount of subsequent surface grinding required. Utility Model Content

[0005] To address the aforementioned problems, this application aims to provide an extension bracket for internal welding of a pipe body, which enables the welding torch to extend into the pipe body to perform linear welding on the internal weld seam, thereby quickly completing the repair welding operation of the internal weld seam of the pipe body, ensuring the pressure-bearing effect of the pipe body, and solving the problem of large subsequent grinding work on the outer surface caused by increasing the amount of welding material from the outer surface of the pipe body.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: an extension bracket for welding inside a pipe body, characterized in that: the extension bracket is set on a welding machine and parallel to the horizontal sliding platform of the welding machine; the pipe body to be welded is placed on the horizontal sliding platform; when the pipe body slides along the horizontal sliding platform, the extension bracket extends into the pipe body from one end and extends out from the other end; a welding gun is installed on the extension bracket, and the welding gun is close to the weld seam inside the pipe body.

[0007] Preferably, the extension bracket includes a vertical plate mounted on the welding machine body and a horizontal rod horizontally connected to the bottom end of the vertical plate, the end of which is provided with a positioning cylinder through which the welding gun passes.

[0008] Preferably, the horizontal rod extends outward toward the positioning cylinder, and rollers that contact the weld seams on both sides of the tube are symmetrically arranged on the horizontal rod on the front and rear sides of the positioning cylinder.

[0009] Preferably, the horizontal bar is hinged to the vertical plate, and a torsion spring is provided at the hinge to drive the horizontal bar to rotate upward.

[0010] The beneficial effects of this application are: the extension bracket is set on the welding machine, and a manual welding gun can be mounted on it. By utilizing the horizontal length of the extension bracket, the welding gun can be driven to extend into the pipe body to perform straight welding on the inner weld seam of the pipe body, thereby quickly completing the repair welding operation of the weld seam inside the pipe body, ensuring the pressure bearing effect of the pipe body, and solving the problem of large subsequent grinding amount on the outer surface caused by increasing the amount of welding material from the outer surface of the pipe body.

[0011] By setting rollers, it is possible to ensure that the welding torch tip maintains a certain distance from the weld seam during the welding process, thereby improving the quality of the internal weld. Attached Figure Description

[0012] Figure 1 This is a diagram illustrating the current process of rolling a sheet into a tube and then welding it into shape.

[0013] Figure 2 This diagram illustrates the horizontal welding of a rolled tube using welding.

[0014] Figure 3 for Figure 2 The image shows the result after welding is complete.

[0015] Figure 4 for Figure 1 Enlarged view of point A in the middle (the weld inside the pipe is not fully welded).

[0016] Figure 5 The extension bracket for this application is shown in the diagram above the welding point.

[0017] Figure 6 This is a diagram of the tube body before welding in this application.

[0018] Figure 7This is a diagram showing the completed welding of the tube body in this application.

[0019] Figure 8 This diagram illustrates the change in the distance between the welding torch tip and the weld seam during the internal welding process of this application.

[0020] Figure 9 The illustration shows rollers installed on the horizontal bars on both sides of the welding torch head in this application.

[0021] Figure 10 This diagram illustrates the contact between the front roller and the inner wall of the tube during welding in this application.

[0022] Figure 11 This diagram illustrates the contact between the front roller of this application, which extends beyond the rear side of the tube, and the inner wall of the tube.

[0023] Figure 12 This diagram illustrates the contact between the roller and the inner wall of the tube in this application.

[0024] In the diagram: 5-Welding torch; 6-Pipe body; 21-Welding head of welding machine. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] See attached document Figures 5-12 The diagram shows an extension bracket for internal welding of a pipe body. The extension bracket 1 is mounted on a welding machine 2 and its vertical height can be adjusted using welding guide rails. Simultaneously, the extension bracket is parallel to the horizontal sliding platform 3 of the welding machine 2. Figure 6-7 As shown, after the pipe to be welded is placed on the horizontal sliding platform 3, as the pipe slides along the platform, the extension bracket 1 can extend into the pipe from one end and out from the other. A welding torch is pre-installed on the extension bracket 1. When installing the torch, the position is adjusted so that the torch tip is close to the weld seam inside the pipe. As the pipe moves to the left on the horizontal sliding platform 3, the extension bracket 1 with the welding torch extends into the pipe, and the torch tip is used to repair the weld seam inside the pipe. This quickly completes the welding and filling of the weld seam inside the pipe, ensuring the pipe's pressure-bearing capacity and solving the problem of excessive subsequent grinding on the outer surface due to increased weld material application. After the inner welding is completed, the pipe is driven in the opposite direction, and the extension bracket 1 and welding torch extend into the pipe.

[0027] Specific examples Figure 5 As shown, the extension bracket 1 includes a vertical plate 11 mounted on the body of the welding machine 2, and a horizontal rod 12 horizontally connected to the bottom end of the vertical plate 11. A positioning cylinder 13 for inserting a welding torch is provided at the end of the horizontal rod 12. Figure 5As shown, during the installation of the welding torch, the torch head is inserted into the positioning cylinder 3 to achieve upper limit positioning and circumferential rotation positioning of the torch head. The torch body can be fixed to the horizontal bar 12 using a metal clamp or similar device. By positioning the torch head in the upper limit and circumferential rotation using the positioning cylinder 13, the influence of the torch head's deflection on the horizontal bar 12 on the welding quality is prevented from being inserted into the pipe body.

[0028] like Figure 8 As shown, due to the long cantilever of the horizontal bar 12 and the weight of the welding torch after its assembly, as well as the surface flatness error due to the rolling of the pipe body, the distance between the welding torch head and the weld may change during welding along the weld length, which may affect the welding quality. Therefore, to avoid this problem, as follows... Figure 9-12 As shown, the horizontal rod 12 extends outward toward the positioning cylinder 13. Rollers 4 are symmetrically arranged on the horizontal rod 12 on the front and rear sides of the positioning cylinder 13, contacting both sides of the weld seam inside the pipe. During horizontal welding, the front roller 4 enters the pipe and contacts the inner walls on both sides of the weld seam. Then, the welding torch enters the pipe for welding. During welding, the contact between the roller 4 and the pipe ensures a consistent distance between the welding torch head and the weld seam. When the roller detaches from the inner wall of the pipe, the welding extension bracket 1 can be moved upwards and downwards to allow the roller 4 to remain in contact with the inner wall of the pipe. Even after the front roller 4 extends out of the pipe, the rear roller 4 remains in contact with the inner wall of the pipe, maintaining a fixed distance between the welding torch head and the weld seam.

[0029] To address the operational difficulty of adjusting the extension bracket 1 to ensure that the roller 4 remains in constant contact with the inner wall of the tube, as described above, Figure 10-11 As shown, the horizontal rod 12 is hinged to the vertical plate 11, and a torsion spring (not shown in the figure) is provided at the hinge to drive the horizontal rod 12 to rotate upward. The force of the torsion spring is greater than the weight of the horizontal rod 12, the welding torch, and the roller 4, so that the roller drives the extension bracket 1 to deflect upward even when no force is applied. During the welding operation, the roller 4 is driven to deflect the horizontal rod 12 upward by the torsion spring, so that the roller 4 is always in contact with the inner wall of the pipe throughout the welding operation. Even if there is a horizontal error in the inner wall of the pipe, the roller 4 will still be in contact with the inner wall of the pipe under the action of the torsion spring, thereby solving the operational difficulty of adjusting the height of the welding torch by welding.

[0030] The principle of this application is as follows: An extension bracket 1 is mounted on the welding machine, and the welding torch is mounted on the extension bracket. When welding the weld seam inside the pipe, the pipe is placed on the horizontal sliding platform 3. The relative position of the welding torch head and the weld seam inside the pipe is adjusted by the vertical track of the welding machine. Then, the pipe is driven towards the welding torch, and the horizontal bar 12 is pressed down to overcome the torsion spring force, so that the front roller 4 enters into the pipe and rolls in contact with the inner wall of the pipe. Then, the welding torch is started, and the pipe is pushed at a uniform speed. The welding torch head performs straight welding on the weld seam, while the roller is always under the torsion spring force to ensure the distance between the welding torch head and the weld seam. After the front roller 4 extends out of the pipe, the rear roller 4 is still in contact with the inner wall of the pipe, thus maintaining the distance between the welding torch head and the weld seam. When the welding torch head extends out of the pipe, the welding is completed, and the pipe is driven in the opposite direction to remove the extension bracket 1 and the welding torch from the pipe.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope of protection, and all such changes and modifications fall within the scope of protection claimed by this utility model.

Claims

1. An extension support for inside welding of a pipe body, characterized by: The extension bracket (1) is set on the welding machine (2) and parallel to the horizontal sliding platform (3) of the welding machine (2). The pipe to be welded is placed on the horizontal sliding platform (3). When the pipe slides along the horizontal sliding platform (3), the extension bracket (1) extends into the pipe from one end and extends out from the other end. A welding gun is installed on the extension bracket (1), and the welding gun is close to the weld seam inside the pipe. The extension bracket (1) includes a vertical plate (11) mounted on the body of the welding machine (2) and a horizontal rod (12) horizontally connected to the bottom end of the vertical plate (11). The end of the horizontal rod (12) is provided with a positioning cylinder (13) through which the welding gun passes. The horizontal rod (12) extends outward toward the positioning cylinder (13), and rollers (4) that contact the weld seams on both sides of the tube are symmetrically arranged on the horizontal rod (12) on the front and rear sides of the positioning cylinder (13). The horizontal bar (12) is hinged to the vertical plate (11), and a torsion spring is provided at the hinge to drive the horizontal bar (12) to rotate upward.

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