A support tool for circular tube repair welding

Abstract

This utility model relates to the field of round tube repair welding technology. Specifically, it involves using a round tube support fixture to support the inner cavity of a thin-walled round tube, preventing inward collapse and deformation during repair welding. The fixture includes a threaded expander rod with four threaded support blades arranged in a circular array on its outer wall. A conformal tube support block is fixedly connected to the outer wall of each threaded support blade. A hexagonal ring is slidably connected to the outer wall of the expander rod, and a hinge is fixedly connected to the outer wall of the hexagonal ring. By precisely inserting the outer wall of the expander rod into the inner cavity of the round tube and aligning the required support position with the conformal tube support block, the left hand holds a tool to stabilize the hexagonal ring, while the right hand holds a tool to rotate the expander rod, tightening it towards the hexagonal ring. This causes the conformal tube support block to expand evenly, achieving an internal support and fixation effect. This avoids changes in the wall thickness of the round tube during repair welding, thereby reducing the potential impact on the final product quality, significantly improving production efficiency, and reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of circular tube repair welding technology, specifically by using a circular tube support fixture to support the inner cavity of a thin-walled circular tube to prevent inward collapse and deformation during repair welding. Background Technology

[0002] Round tube repair welding refers to the technical means of repairing defects in round tube workpieces caused by various reasons such as damage, cracks, and wear using welding methods, in order to restore their original performance or meet specific usage requirements. Support fixtures are auxiliary equipment designed for round tube repair welding operations.

[0003] Select appropriate welding machines and electrodes based on the material, diameter, and wall thickness of the round pipe, and prepare the necessary safety protection equipment. Before welding, ensure that the surface of the round pipe is clean and free of oil, rust, and other impurities. For internal defects, first use carbon arc gouging to clean them. Gouging should be steady and accurate, and the bevel should be uniform and smooth after gouging. Adjust the current and voltage of the welding machine according to the material of the round pipe, such as steel or iron, and reconfirm the location and size of the defects. During the welding process, keep the welding torch stable and move it at an appropriate angle and speed. The weld after repair welding must be ground, and the remaining wall thickness after grinding should be within the specified wall thickness tolerance range. Carefully inspect the weld to ensure that it is uniform and free of defects.

[0004] However, during the local welding process of thin-walled round tubes, the concentrated heat during welding causes material shrinkage, which in turn causes changes in the diameter or wall thickness of the round tube, especially in thin-walled structures. This deformation affects the dimensional accuracy and contour integrity of the workpiece, thus affecting the quality of the final product. The existing solution is to use multiple welding processes to reduce the deformation of the heat-affected zone by reducing the heat input of each welding. However, although this method is effective, it leads to a decrease in production efficiency and insufficient economic benefits. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] This solution resolves the issue of shrinkage caused by existing welding methods, which negatively impacts product quality. It also avoids the need for multiple welding operations, thereby improving production efficiency and reducing production costs.

[0007] (II) Technical Solution

[0008] In view of the aforementioned problems with support, this utility model is proposed.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a support fixture for welding repair of round pipes, including a threaded expansion rod, four threaded support blades arranged in a circular array are threadedly connected to the outer wall of the threaded expansion rod, a round pipe conformal patch is fixedly connected to the outer wall of the threaded support blades, a hexagonal ring is slidably connected to the outer wall of the threaded expansion rod, and a hinge is fixedly connected to the outer wall of the hexagonal ring.

[0010] As a preferred embodiment of the support fixture for welding round pipes according to this utility model, one end of the outer wall of the threaded expansion rod is provided with a threaded frustum, and the other end of the outer wall of the threaded expansion rod is provided with a hexagonal frustum.

[0011] As a preferred embodiment of the support fixture for welding round pipes according to this utility model, the outer wall of the threaded expansion rod is cylindrical, and the outer wall of the threaded support blade is provided with an embedding groove to facilitate the installation of the round pipe conformal patch.

[0012] As a preferred embodiment of the support fixture for welding round pipes according to this utility model, the inner wall of the threaded support blade is provided with threads to facilitate frustum threaded connection.

[0013] As a preferred embodiment of the support fixture for round pipe repair welding according to this utility model, the outer wall of the threaded support blade is fixedly connected to the outer wall of the hinge.

[0014] As a preferred embodiment of the support fixture for welding repair of round pipes according to this utility model, the bottom end of the conformal patch of the round pipe is T-shaped, which facilitates sliding into the inner wall of the groove.

[0015] The beneficial effects of this utility model are:

[0016] 1. By precisely inserting the outer wall of the threaded expansion rod into the inner cavity of the round tube, and aligning the required support position with the conformal patch of the round tube, the left hand holds the tool to stabilize the hexagonal ring, while the right hand holds the tool to rotate the threaded expansion rod, tightening it towards the hexagonal ring. This causes the conformal patch of the round tube to expand evenly, achieving the effect of internal support and fixation. This avoids changes in the wall thickness of the round tube during the welding process, thereby reducing the potential impact on the final product quality, significantly improving production efficiency and reducing production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

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

[0019] Figure 2 This is a schematic diagram of the overall structure of the threaded expander rod of this utility model.

[0020] Figure 3 This is a schematic diagram of the overall structure of the threaded support blade of this utility model.

[0021] Figure 4 This is a schematic diagram of the installation structure of the circular tube conformal patch of this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Threaded expansion rod; 2. Threaded support blade; 3. Hexagonal ring; 4. Hinge; 5. Round tube conformal patch. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Reference Figure 1-4 This is the first embodiment of the present invention, which provides a support fixture for welding repair of round pipes, including a threaded expansion rod 1. The outer wall of the threaded expansion rod 1 is threadedly connected to four threaded support blades 2 arranged in a circular array. The threaded support blades 2 are used to drive the round pipe conformal patch 5 to move. A 0.5mm thermal expansion gap is reserved between the round pipe conformal patch 5 and the threaded support blades 2. The outer wall of the threaded support blades 2 is fixedly connected to the round pipe conformal patch 5. The outer wall of the round pipe conformal patch 5 is inclined to facilitate fitting the inner wall of the round pipe. The outer wall of the threaded expansion rod 1 is slidably connected to a hexagonal ring 3. The outer wall of the hexagonal ring 3 is fixedly connected to a hinge 4. The hinge 4 is used to drive the threaded support blades 2 to rotate.

[0025] One end of the outer wall of the threaded expander 1 is provided with a threaded frustum, which facilitates the threaded support of the spiral blade 2 for threaded connection. The other end of the outer wall of the threaded expander 1 is provided with a hexagonal frustum.

[0026] The outer wall of the threaded expansion rod 1 is cylindrical, and the outer wall of the threaded support blade 2 is provided with an embedding groove to facilitate the installation of the round tube conformal patch 5.

[0027] The inner wall of the threaded support blade 2 is provided with threads to facilitate frustum thread connection. The outer wall of the threaded support blade 2 is fixedly connected to the outer wall of the hinge 4. The bottom end of the round tube conformal patch 5 is "T" shaped to facilitate sliding into the inner wall of the groove. The round tube conformal patch 5 is made of copper metal with good thermal conductivity.

[0028] During use, select a matching conformal tube patch 5 according to the inner diameter of the tube to be repaired. Ensure that the conformal tube patch 5, after unfolding, can tightly fit the inner wall and provide uniform support. Assemble the threaded support blade 2, conformal tube patch 5, hinge 4, and hexagonal ring 3 into a complete fixture according to the design sequence. Align the conformal tube patch 5 directly with the defect location. Use a non-slip wrench with your left hand to fix the hexagonal ring 3 to prevent circumferential displacement of the fixture. The gap between the inner hole of the hexagonal ring and the threaded expansion rod should be ≤0.1mm. Use a torque wrench with your right hand to rotate the threaded expansion rod 1 clockwise, pushing the threaded support blade 2. Axial movement: Since the inner wall of the round tube conformal patch 5 is installed on the outer wall of the threaded support blade 2, the round tube conformal patch 5 gradually expands as the threaded expansion rod 1 is screwed in until it forms a rigid contact with the inner wall of the round tube. If the round tube conformal patch 5 is found to have slight displacement due to heat input during the welding process, the copper patch can withstand a temperature of ≤300℃. Welding can be paused, and the threaded expansion rod 1 can be reversed to reset the patch position. After welding is completed, let it cool to room temperature, rotate the threaded expansion rod 1 counterclockwise to shrink the round tube conformal patch 5, and gently pull the fixture to remove it as a whole. Avoid forcibly dragging and damaging the inner wall. The operation is now complete.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A support fixture for welding repair on round pipes, characterized in that: The device includes a threaded expansion rod (1), the outer wall of which is threadedly connected to four threaded support blades (2) arranged in a circular array, the outer wall of which is fixedly connected to a circular tube conformal patch (5), the outer wall of which is slidably connected to a hexagonal ring (3), and the outer wall of which is fixedly connected to a hinge (4).

2. The support fixture for welding repair on a circular pipe according to claim 1, characterized in that: One end of the outer wall of the threaded expansion rod (1) is provided with a threaded frustum, and the other end of the outer wall of the threaded expansion rod (1) is provided with a hexagonal frustum.

3. The support fixture for welding repair on a circular pipe according to claim 1, characterized in that: The outer wall of the threaded expansion rod (1) is cylindrical, and the outer wall of the threaded support blade (2) is provided with an embedding groove to facilitate the installation of the round tube conformal patch (5).

4. The support fixture for welding repair on a circular pipe according to claim 1, characterized in that: The inner wall of the threaded support blade (2) is provided with threads to facilitate frustum thread connection.

5. A support fixture for welding repair on a circular pipe according to claim 1, characterized in that: The outer wall of the threaded support blade (2) is fixedly connected to the outer wall of the hinge (4).

6. A support fixture for welding repair on a circular pipe according to claim 1, characterized in that: The bottom end of the circular tube conformal patch (5) is "T" shaped, which facilitates sliding into the inner wall of the groove.

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