Device for filling pipe splicing pipe with shielding gas

Abstract

The invention relates to a device for filling a pipe splicing pipe with shielding gas. The device for filling the pipe splicing pipe comprises a gas outlet connecting pipe, the gas outlet connecting pipe is communicated with a first gas bag, a pressure check valve, a second gas bag and the first end of a three-way ball valve, the pressure check valve is located between the first gas bag and the second gas bag, and the three-way ball valve is located on the outer side of a workpiece. The second end of the three-way ball valve is communicated with a gas inlet pipe to input the shielding gas. 1, The device for filling the pipe splicing pipe is compact in structure, small in occupied space and convenient to manufacture and maintain; 2, time and labor are saved during dismounting, mounting and moving, gas loss is low, and energy conservation and environmental protection are achieved; 3, by adopting the particularity of the adjustable size of a double-gas-bag structure due to inflation expansion and deflation contraction, the device for filling the pipe splicing pipe can adapt to pipes with different specifications and irregular cavity sections; and 4, abrasion-proof heat insulation strips are arranged on the peripheries of the double gas bags, and damage and breakage caused by too high temperature of the inner wall of the contact pipe when the gas bags are abraded and expanded are effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of welding tooling, and relates to a protective gas filling device for splicing pipes. Background technique [0002] As a common pressurized equipment, boilers are widely used in heating, gas supply and heating projects. Many parts of boilers, such as economizers, superheaters, water pipe systems, etc., use pipes. Because the pipes involved are of different specifications and lengths, pipe butt joints are very common in the boiler manufacturing process. [0003] Due to the advantages of good welding quality, high efficiency and easy automation, gas shielded welding has been widely used and promoted in pipe butt jointing. At present, when using gas shielded welding, when filling the pipe with shielding gas, the required shielding gas is continuously filled at both ends of the butt pipe end, so that the shielding gas in the pipe is filled to the required concentration. This method is time-consuming (it takes...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a protective gas filling device for splicing pipes, which can solve the problem that the protective gas needs to fill the entire pipe fitting and the leakage loss is relatively large during the gas filling process), labor-intensive (the waiting time for inflation is long when the splicing pipe fittings are long) long), environmental hazards (the protective gas filled during the filling process is directly leaked and discharged into the space environment of the working area, which affects the environment and human health, and there are health and safety hazards)

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