Portable gas brazing welding gun

Abstract

The invention discloses a portable gas brazing welding gun. A valve core, an adjusting valve and one end of an air mixer are mounted on an adjusting valve body; one end of a casing is connected with a gun barrel through a gun barrel assembly, and a switch lock matched with a propping button which is connected with an ignitor is mounted on the side wall of the casing; the propping button is matched with the valve core; a pressure reducing valve consists of a filter I in a gas cylinder thimble on a pressure reducing valve body, as well as a filter II, a gas needle spring and a gas needle upper fixing steel needle with a gas needle sealing pad, which are mounted in a gas needle seat; one end surface of a dishing bowl is contacted with the steel needle while the other end surface thereof is matched with the sealing pad and a gas channel seat; and the gas channel seat is connected with the adjusting valve body into a whole through a gas pipe. A two-stage filter is arranged on the pressure reducing valve so that the problem on the appearance of red fire caused by inadequate combustion is radically solved. The pressure reducing valve can be used for adjusting the pressure as well as preventing the backfire, thereby radically stopping the safety accidents caused by the backfire. A switch lock is mounted; when not working, the switch lock is in a safe state to prevent false operations; and when working, the switch lock is loosened so that the fuel gas can pass through the switch lock even if is in a locked state. The welding gun is convenient to use, labor-saving, safe, light in weight and easy to carry.

Description

technical field [0001] The invention relates to a welding torch, in particular to a portable gas brazing welding torch used for various non-ferrous metal pipes or repairing parts on the maintenance site. Background technique [0002] At present, gas brazing welding technology and welding torches have been widely used, especially in the chemical industry, refrigeration, and household appliances industries. Portable gas brazing welding torches are used for on-site maintenance services. Because of their small size, they do not require gas cylinders and are easy to carry. , concentrated firepower at welding points, and easy operation make this type of miniaturized portable gas brazing torch favored by many users. [0003] Patent No. 00254374.5 "Safety Switch for Gas Spray Welding Torch" also provides a kind of danger to prevent children from playing or piling up collisions and misoperations to open the welding torch switch to ensure safe use, but its structure is more complicate...

AI Technical Summary

Problems solved by technology

[0003] Patent No. 00254374.5 "Safety Switch for Gas Spray Welding Torch" also provides a kind of danger to prevent children from playing or piling up collisions and misoperations to open the welding torch switch to ensure safe use, but its structure is more complicated, and it is necessary to install a system on the periphery of the ignition button. A number of protruding clamping blocks are provided with actuating grooves at the positions corresponding to the protruding clamping blocks on the inner wall of the welding torch shell, and springs with axial thrust and rotational torque are configured. Before the ignition button is pressed down to ignite, the ignition button must be pressed Rotate into the straight slot relative to the action slot

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