Pre-welding flame preheating tool for thick-wall round pipe

Abstract

The utility model discloses a pre-welding flame preheating tool for a thick-wall round pipe. The pre-welding flame preheating tool comprises a support (1), an arc-shaped flame preheating assembly (2) installed on the support and a speed-adjustable round pipe rolling device (3) for containing the thick-wall round pipe. The arc-shaped flame preheating assembly comprises an arc-shaped heating main pipe (21), a group of flame nozzles (22) arranged on one side of the arc-shaped heating main pipe, a gas inlet pipe (23) communicated with the arc-shaped heating main pipe, and a gas valve (24) arranged on the gas inlet pipe; the support comprises a base (11), a vertical rod (12) installed on the base and an angle adjusting rod (13) installed on the vertical rod, and the speed-adjustable round pipe rolling device comprises a second base (31), four idler wheels (32) fixed to the second base and a motor connected with the idler wheels. The thick-wall round pipe preheating device is simple in structure and flexible to operate, the thick-wall round pipe is evenly preheated within a short time before welding, the welding seam quality of the thick-wall round pipe is improved, and compared with a traditional baking gun, the preheating efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel structure thick-walled circular tube column welding, and particularly relates to a preheating tool for thick-walled circular tube welding before welding. Background Art

[0002] When welding thick steel plates of steel structures, heat dissipation is fast. Due to the too fast cooling rate of the weld seam, hardened structures and strong welding residual stresses are generated, resulting in cracks. Therefore, preheating is adopted before welding thick steel plates of steel structures to meet the welding process requirements.

[0003] At present, preheating before welding mainly includes high-frequency induction heating, electric heating and flame heating. Among them, flame heating is widely used. However, since the surface of the thick-walled circular tube is a curved surface, the traditional method is to use a single torch, and the mixture of oxygen and gas is burned to generate heat to heat the thick plate weld seam. This method has a small heating area and cannot reach the preheating temperature required by the welding process in a short time. Moreover, the uneven dot-shaped heating instead causes greater additional stress, resulting in cracks in the weld seam, and at the same time, the welding efficiency is low. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies of the existing technology and provide a preheating tool for thick-walled circular tube welding before welding with uniform preheating temperature and high preheating efficiency.

[0005] To achieve the above purpose, the following solutions are adopted in the utility model:

[0006] A preheating tool for thick-walled circular tube welding before welding includes a bracket, an arc-shaped flame preheating component installed on the bracket, and an adjustable-speed circular tube rolling device for placing the thick-walled circular tube;

[0007] The arc-shaped flame preheating component includes an arc-shaped heating main pipe, a group of flame nozzles arranged on one side of the arc-shaped heating main pipe, an air inlet pipe communicated with the arc-shaped heating main pipe, and a gas valve arranged on the air inlet pipe;

[0008] The bracket includes a base, a vertical rod installed on the base, and an angle adjusting rod installed on the vertical rod; the vertical rod and the angle adjusting rod are fixed by a locking nut, and the arc-shaped heating main pipe is fixed on the angle adjusting rod;

[0009] The adjustable-speed circular tube rolling device includes a second base, four rollers fixed on the second base, and a motor connected to the rollers. The rollers are driven to rotate by the motor, and the rotation of the rollers drives the thick-walled circular tube to rotate.

[0010] Further, the arc-shaped heating main pipe is arranged concentrically with the thick-walled circular tube to be preheated.

[0011] Further, both the vertical rod and the angle adjusting rod are telescopic rods, and the telescopic parts are locked and fixed by bolts.

[0012] Further, the distance between the flame nozzle and the outer wall of the thick-walled circular tube to be preheated is 50 - 80 mm.

[0013] Advantages of the present utility model:

[0014] The present utility model uses an adjustable-speed circular tube rolling device and an arc-shaped flame preheating assembly to uniformly preheat the thick-walled circular tube in a short time before welding. By adjusting the vertical rod with a telescopic rod and the angle adjustment rod, the distance between the flame nozzle of the arc-shaped flame preheating assembly and the thick-walled tube is kept consistent to make the preheating temperature uniform; open the intake valve, ignite the flame with a lighter, and when the temperature of the part to start preheating rises to the temperature required by the process, start rotating the adjustable-speed circular tube rolling device to make the thick-walled circular tube rotate and be heated evenly, improving the welding quality of the thick-walled circular tube; the structure of the present utility model is simple, the operation is flexible, and the preheating efficiency is improved compared with the traditional blowtorch. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model;

[0016] Figure 2 It is a schematic diagram of the arc-shaped flame preheating assembly of the present utility model. Specific implementation manners

[0017] The following further elaborates on the present utility model in conjunction with the attached drawings of the specification.

[0018] Refer to Figures 1 - 2 , a pre-welding flame preheating tooling for thick-walled circular tubes, comprising a bracket 1, an arc-shaped flame preheating assembly 2 installed on the bracket, and an adjustable-speed circular tube rolling device 3 for placing the thick-walled circular tube;

[0019] The arc-shaped flame preheating assembly includes an arc-shaped heating main pipe 21, which is concentrically arranged with the thick-walled circular tube to be preheated. When rotating the adjustable-speed circular tube rolling device, the thick-walled circular tube rotates and is heated evenly, improving the welding quality of the thick-walled circular tube and at the same time improving the preheating efficiency. A group of flame nozzles 22 arranged on one side of the arc-shaped heating main pipe, an intake pipe 23 communicated with the arc-shaped heating main pipe, and a gas valve 24 arranged on the intake pipe;

[0020] The bracket includes a base 11, a vertical rod 12 installed on the base, and an angle adjustment rod 13 installed on the vertical rod; after adjusting the required angles of the vertical rod and the angle adjustment rod, they are fixed by locking nuts, and the arc-shaped heating main pipe is fixed on the angle adjustment rod; both the vertical rod and the angle adjustment rod are telescopic rods, and the telescopic parts are locked and fixed by bolts, and the distance between the flame nozzle and the outer wall of the thick-walled circular tube to be preheated is 50 - 80 mm. By using the telescopic vertical rod and the angle adjustment rod to adjust, the distance between the flame nozzle of the arc-shaped flame preheating assembly and the thick-walled tube is kept consistent to make the preheating temperature uniform and improve the welding quality of the thick-walled circular tube;

[0021] The adjustable-speed circular pipe rolling device 3 includes a second base 31 and four rollers 32 fixed on the second base. The rollers are driven to rotate by a motor, and the rotation of the rollers drives the thick-walled circular pipe to rotate. The adjustable-speed circular pipe rolling device can also be other devices in the prior art that can make the thick-walled circular pipe rotate. It is best for the motor to drive the rollers to rotate at a constant speed. When the adjustable-speed circular pipe rolling device rotates the thick-walled circular pipe, the heating is uniform, which improves the weld quality of the thick-walled circular pipe and at the same time improves the preheating efficiency.

[0022] The usage method of the present utility model is as follows:

[0023] Refer to Figure 1 , place the thick-walled circular pipe A to be preheated on the adjustable-speed circular pipe rolling device, adjust through the bracket so that the arc-shaped heating main pipe is located on the outer wall of the thick-walled circular pipe to be preheated. The distance between the flame nozzle and the outer wall of the thick-walled circular pipe to be preheated is 50 - 80 mm. Fix and lock the bracket through the lock nut, then open the intake valve, ignite the flame with a lighter. When the temperature of the part to start heating rises to the temperature required by the process, rotate the adjustable-speed circular pipe rolling device to rotate at a constant speed through the control cabinet button. When the thick-walled circular pipe to be preheated is uniformly heated to the temperature required by the process, start the welding operation. After the welding operation is completed, remove the thick-walled circular pipe from the present utility model, and then perform circumferential weld welding on the thick-walled circular pipe.

[0024] The above-described embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A flame preheating tool for thick-walled round pipe welding, characterized in that: It comprises a bracket (1), an arc-shaped flame preheating assembly (2) mounted on the bracket, and an adjustable speed round tube rolling device (3) for placing thick-walled round tubes; The arc-shaped flame preheating assembly comprises an arc-shaped heating main pipe (21), a group of flame nozzles (22) arranged on one side of the arc-shaped heating main pipe, an air intake pipe (23) connected to the arc-shaped heating main pipe, and a gas valve (24) arranged on the air intake pipe; The bracket comprises a base (11), a vertical pole (12) mounted on the base, and an angle adjustment rod (13) mounted on the vertical pole, the vertical pole and the angle adjustment rod being fixed by a locking nut, and the arc-shaped heating main pipe being fixed on the angle adjustment rod; The adjustable speed round tube rolling device (3) comprises a second base (31), four rollers (32) fixed on the second base, and a motor connected to the rollers.

2. A flame preheating tool for thick-walled round pipe welding as claimed in claim 1, characterized in that: The arc-shaped heating main pipe is arranged cocentrically with the thick-walled circular pipe to be preheated.

3. A flame preheating tool for thick-walled round pipe welding as claimed in claim 1, characterized in that: The vertical rod and the angle adjustment rod are both retractable rods, and the retractable parts are locked and fixed by bolts.

4. A flame preheating tool for thick-walled round pipe welding according to any one of claims 1 to 3, characterized in that: The distance between the flame nozzle and the outer wall of the thick-walled circular tube to be preheated is 50-80 mm.

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