Black-smoke-free preheating device of welding joint

Abstract

The utility model discloses a black smoke-free preheating device of a welding joint, which comprises two gas pipes and a collecting pipe, the collecting point of the two gas pipes is communicated with the collecting pipe, the two gas pipes are respectively used for conveying combustible gas and oxygen, and the two gas pipes are respectively provided with a gas switch and a tempering valve; the two gas pipes are communicated with the collecting pipe, a tempering valve is arranged at the position, close to the collecting point of the two gas pipes, of the collecting pipe, and cooling and preheating assemblies distributed at equal intervals are arranged on the collecting pipe, the gas pipes, the collecting pipe and the cooling and preheating assemblies are arranged, the two gas pipes are communicated with the collecting pipe after being collected, and the shape of the collecting pipe is set according to the shape of a part to be preheated; the preheating flame size and the combustion condition can be controlled by adjusting the opening and closing degree of gas on the two gas pipes, it is guaranteed that combustible gas is fully combusted, black smoke is not generated, air pollution is reduced, synchronous preheating of components with complex structures is achieved, and the preheating effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding preheating, and particularly relates to a smokeless preheating device for a welding joint. Background Technique

[0002] When fusion welding ordinary low-alloy structural steel and thick plates with a relatively high carbon content, due to the influence of the welding thermal cycle of local high-temperature heating and cooling of the metal, various different changes occur in the internal structure of the metal, directly affecting the mechanical properties of the welding joint. In addition, due to the influence of welding metallurgical conditions and different heating and cooling rates, the tissue inhomogeneity of the weld and the heat-affected zone will be caused, which will also indirectly and directly affect the mechanical properties of the welding joint.

[0003] Therefore, it is very necessary to change or improve the mechanical properties of the welding joint by heating, heat preservation, and controlling the cooling rate of the local or all parts of the welded part before welding, during welding, and after welding.

[0004] The existing preheating devices at the welding joint have the following problems:

[0005] 1. Incomplete combustion of combustible gas is likely to produce black smoke, affecting the preheating effect and causing air pollution.

[0006] 2. Backfire occurs at the end of preheating, leading to safety accidents, with low safety and stability.

[0007] 3. It is difficult to achieve synchronous preheating for complex structural components.

[0008] Therefore, we propose a smokeless preheating device for a welding joint. Content of the Utility Model

[0009] The purpose of the utility model is to provide a smokeless preheating device for a welding joint to solve the problems raised in the above background technique.

[0010] To achieve the above purpose, the utility model provides the following technical solution: A smokeless preheating device for a welding joint, including two gas pipes and a manifold. The convergence point of the two gas pipes is communicated with the manifold. The two gas pipes respectively convey combustible gas and oxygen, and gas switches and backfire valves are arranged on both gas pipes;

[0011] A backfire valve is arranged on the manifold near the convergence point of the two gas pipes, and cooling and preheating components are arranged on the manifold at equal intervals.

[0012] Preferably, the gas pipe is a pipe made of copper pipe.

[0013] Preferably, the gas switch is arranged on and communicated with the trachea, and a backfire valve is arranged on both sides of the gas switch corresponding to each trachea.

[0014] Preferably, the confluence point of the two tracheas is connected to the manifold by insertion.

[0015] Preferably, the shape of the manifold is set according to the shape of the component to be preheated.

[0016] Preferably, a bursting disc is arranged at one end of the manifold away from the backfire valve.

[0017] Preferably, the cooling and preheating assembly includes a nozzle, a sleeve, a fine copper mesh and a base;

[0018] The base is arranged on the manifold, the sleeve is threadedly connected to the base, the fine copper mesh is arranged in the sleeve, and the nozzle is threadedly connected to the sleeve.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The present utility model is provided with a trachea, a manifold and a cooling and preheating assembly. After the two tracheas are confluent, they are communicated with the manifold, and the shape of the manifold is set according to the shape of the component to be preheated. During use, the manifold fits the component to be preheated. The gas switch is opened, and the combustible gas and oxygen are transported from the two tracheas to the manifold after confluence, and then sprayed out from the cooling and preheating assembly on the manifold, and the mixed gas sprayed out at the nozzle is ignited to preheat the component to be preheated. By adjusting the degree of the gas switch on the two tracheas, the size and combustion condition of the preheating flame can be controlled, ensuring that the combustible gas burns fully without generating black smoke, reducing air pollution, realizing synchronous preheating of components with complex structures, and improving the preheating effect;

[0021] 2. The present utility model is provided with backfire valves on both sides of the gas switch, providing double anti-backfire protection, avoiding the occurrence of backfire problems after preheating, preventing safety accidents, and improving the use safety and stability of the preheating device;

[0022] 3. The confluence point of the two tracheas in the present utility model is connected to the manifold by insertion, adopting a detachable design, adapting to various components with complex structures, being able to fit well during use, being convenient for disassembly, simple to use, not easily damaged, and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model.

[0024] In the figure: 1. Gas pipe; 2. Confluence pipe; 3. Gas switch; 4. Flashback arrester; 5. Cooling and preheating assembly; 501. Nozzle; 502. Sleeve; 503. Fine copper mesh; 504. Base; 6. Bursting disc. Detailed implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1 , the smokeless preheating device for the welding joint provided by the present invention includes two gas pipes 1 and a confluence pipe 2. The gas pipe 1 is a pipe made of copper pipe. The confluence point of the two gas pipes 1 is communicated with the confluence pipe 2. The two gas pipes 1 respectively transport combustible gas and oxygen. A gas switch 3 and a flashback arrester 4 are arranged on both of the two gas pipes 1;

[0027] A flashback arrester 4 is arranged on the confluence pipe 2 near the confluence point of the two gas pipes 1. The shape of the confluence pipe 2 is set according to the shape of the component to be preheated. A bursting disc 6 is arranged at one end of the confluence pipe 2 far from the flashback arrester 4. Cooling and preheating assemblies 5 are arranged on the confluence pipe 2 at equal intervals. The cooling and preheating assembly 5 includes a nozzle 501, a sleeve 502, a fine copper mesh 503 and a base 504; the base 504 is arranged on the confluence pipe 2, the sleeve 502 is threadedly connected to the base 504, the fine copper mesh 503 is arranged in the sleeve 502, and the nozzle 501 is threadedly connected to the sleeve 502.

[0028] The present invention is provided with a gas pipe 1, a confluence pipe 2 and a cooling and preheating assembly 5. The two gas pipes 1 are confluent and then communicated with the confluence pipe 2, and the shape of the confluence pipe 2 is set according to the shape of the component to be preheated. During use, the confluence pipe 2 is attached to the component to be preheated. The gas switch 3 is opened, and the combustible gas and oxygen are transported from the confluence of the two gas pipes 1 to the confluence pipe 2, and then sprayed out from the cooling and preheating assembly 5 on the confluence pipe 2. The mixed gas sprayed out at the nozzle 501 is ignited to preheat the component to be preheated. By adjusting the degree of the gas switch 3 on the two gas pipes 1, the size and combustion condition of the preheating flame can be controlled, ensuring that the combustible gas burns fully, without generating black smoke, reducing air pollution, realizing synchronous preheating of components with complex structures, and improving the preheating effect.

[0029] In this embodiment, as Figure 1 shown, the gas switch 3 is arranged on the gas pipe 1 and is communicated. Flashback arresters 4 are arranged on both sides of the gas switch 3 corresponding to each gas pipe 1;

[0030] The utility model is provided with backfire valves 4 on both sides of the gas switch 3, providing double backfire protection to avoid backfire problems during the end of preheating, prevent safety accidents, and improve the use safety and stability of the preheating device.

[0031] In this embodiment, as Figure 1 shown, the confluence point of the two gas pipes 1 is inserted and connected to the manifold pipe 2, adopting a detachable design, adapting to various components with complex structures, being able to fit well in use, convenient for disassembly, simple to use, not easily damaged, and durable.

[0032] In summary, the usage method of the smokeless preheating device for the welding joint provided in this embodiment: during use, the manifold pipe 2 is attached to the component to be preheated, the gas switch 3 is opened, the combustible gas and oxygen are converged and transported from the two gas pipes 1 into the manifold pipe 2, and then ejected from the cooling preheating component 5 on the manifold pipe 2. The mixed gas ejected from the nozzle 501 is ignited to preheat the component to be preheated. By adjusting the degree of the gas switch 3 on the two gas pipes 1, the size and combustion condition of the preheating flame can be controlled to ensure the full combustion of the combustible gas.

[0033] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A no-black-smoke preheating device for a welding joint, characterized in that It includes two gas pipes (1) and a manifold pipe (2). The confluence point of the two gas pipes (1) is connected to the manifold pipe (2). The two gas pipes (1) respectively convey combustible gas and oxygen. Gas switches (3) and flashback arresters (4) are provided on both of the two gas pipes (1). A flashback arrester (4) is provided on the manifold pipe (2) near the confluence point of the two gas pipes (1). Cooling and preheating assemblies (5) are provided on the manifold pipe (2) in equally spaced distribution.

2. The non-smoky preheating device for a welded joint according to claim 1, characterized in that: The gas pipe (1) is a pipe made of copper pipe.

3. The no-black-smoke preheating device for a welding joint according to claim 1, wherein: The gas switch (3) is provided on and communicated with the gas pipe (1). Flashback arresters (4) are provided on both sides of each gas pipe (1) corresponding to the gas switch (3).

4. The no-black-smoke preheating device for a welding joint according to claim 1, characterized in that: The confluence point of the two gas pipes (1) is connected to the manifold pipe (2) in a plug-in connection.

5. The no-black-smoke preheating device for a welding joint according to claim 1, wherein: The shape of the manifold pipe (2) is set according to the shape of the component to be preheated.

6. The non-smoky preheating device for a welding joint according to claim 1, characterized in that: A rupture disc (6) is provided at one end of the manifold pipe (2) away from the flashback arrester (4).

7. The no-black-smoke preheating device for a welded joint according to claim 1, characterized in that: The cooling and preheating assembly (5) includes a nozzle (501), a sleeve (502), a fine copper mesh (503) and a base (504). The base (504) is provided on the manifold pipe (2). The sleeve (502) is threadedly connected to the base (504). The fine copper mesh (503) is provided in the sleeve (502). The nozzle (501) is threadedly connected to the sleeve (502).

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