SU1118502A1 - Torch for gas-shielded arc welding - Google Patents

Abstract

ARC BURNER IN PROTECTIVE GAS, containing a nozzle for supplying protective gas, a current-carrying mouthpiece, a suction nozzle, and a handle inside which there is a suction channel, a tube for supplying protective gas and a current supply, which is improving the viewing area, increasing the amount of sucked contaminated air, reducing the likelihood of gas loosening, and reducing the heating of the burner handle; it is equipped with a tube for supplying compressed air, the outlet of which is but at the non-working end of the nozzle and facing the inlet of the suction nozzle, the suction nozzle is made in the form of a crunched screen to protect the welder's hand, races. on the handle and facing a large base and an inlet (L aperture towards the burner nozzle, and the axis of the outlet of the compressed air supply tube intersects with the axis of the suction channel in the plane of the smaller base of the cone-shaped screen.

Description

Dg. Soiifyf

Ash1,1 and ta The invention relates to gas-shielded gas-arc torches and can be used in welding production to improve the sanitary-hygienic working conditions of welders. Burners with dust collectors, made in the form of a cat nozzle, the outer surface of which has evenly spaced suction inlets, or in the form of a burner with an annular suction slit located at some distance from the nozzle end are known. A disadvantage of the known burners is a reduction in the field of view compared to a torch without a dust collector, the possibility of disrupting the protection with an increase in the amount of suction air, as well as heating of the handle and the current lead of the exhausted hot air with an aerosol. The closest in technical essence and effect achieved to the invention is a burner.-. For gas-shielded arc welding, containing a current-carrying core for supplying protective gas — a sleeve that encompasses; ui $ on the nozzle suction nozzle mouth. oval concentric with respect to the nozzle and forming. there is a concentric suction with it, as well as a handle inside which the suction channel, protective gas supply tube and current lead are located. r2 The disadvantage of the known burner is the reduction of the field of view due to the presence in the construction of the burner of the suction nozzle the amount of suction air, as well as the heat of the handle and the cold-wave from the intake of hot air with an aerosol. The purpose of the invention is to improve the field of view, increase the amount of suctioned contaminated air, reduce the likelihood of gas protection failing, and also reduce the heating of the burner handle. The goal is achieved by the fact that a gas-arc welding torch. containing a nozzle for supplying protective gas, a current-carrying mouthpiece from the suction nozzle, and a handle inside which the suction channel is located, for supplying a protective device and current lead, is equipped with a pipe for supplying compressed air, the outlet of which is located at the non-working end of the nozzle and facing the inlet side of the suction nozzle, the suction nozzle is made in the form of a cone-shaped screen to protect the hand. - welder located on the handle and facing the large base and the inlet m in the direction of the burner nozzles and the outlet tube axis for supplying compressed air intersects the axis of the suction channel in the minor base of the conical plane of the screen. Making a suction nozzle in the form of a cone-shaped screen to protect the welder's hand, with a smaller alignment of the handle mounted on the front end, and a larger one with the directional .3 side of the welding arc, allows to detect the released harm without affecting the quality of the seam protection (without breaking the protection ), since the screen is located at a great distance from the welding arc and at the same time protects the welder’s hands from molten metal splashes and radiation during the welding process. This embodiment allows an increase in the amount of exhausted air with an aerosol without increasing the velocity of the air in the weld zone, due to the increased diameter of the screen (inlet nozzle) compared to the nozzle located near the weld zone. The screen is a visor that directs the jet of intake air, it simultaneously restricts air leakage from the sides, thereby increasing the efficiency of trapping the aerosol burner. The location of the outlet opening of the compressed air supply tube near the nozzle and the screen directed toward the side improves the suction efficiency due to the ejection of the convective air flow from the aerosol with a jet of compressed air flowing at high speed and directed toward the suction port of the nozzle. In addition, a stream of compressed air with a temperature of 15–20 ° C, along with heated suction air into the channel of the handle, cools the latter and also cools the conductor, which reduces the cross section of the conductor; selected on the basis of its permissible overheating. The intersection of the axis of the outlet of the compressed air supply tube with the axis of the suction channel of the handle in the plane of the smaller base of the cone-shaped screen is caused by the need to reduce the resistance at the entrance to the suction channel of the handle and prevent the compressed air from knocking out of the nozzle being sucked by harm. The drawing shows a torch for arc welding in shielding gases. The burner includes a handle 1 inside which there is a suction channel 2, a tube for supplying protective gas 3 and a current lead 4. The burner has a current-carrying mouthpiece 5 with a current-feeding tip 6,

and a nozzle 7 for directing the protective gas to the welding zone. A suction head 8, made conical, is mounted on the handle of the burner, and fixed to the handle by its smaller base. The larger base of the nozzle 8 of the screen to protect the hands of the welder (its inlet) is drawn into the str; 7 burner nozzles. In the handle of the reel, there is a tube 9 for dl / compressed air supply, the outlet 10 of which is located at the non-working end of the burner nozzle 7 and faces the inlet of the nozzle 8.

The device works as follows.

In the process of welding with the included suction and the supply of compressed air, the capture and removal of

Aerosol through the screen 8 of NASK 8, channel 2 in the handle 1 and then through the exhaust vacuum system is released into the atmosphere. The compressed air flow at high speed from hole 10 carries with it an iodine air flow above the aerosol and directs it to the inlet of the nozzle 8, then to the suction channel 2, thereby increasing the suction efficiency.

The proposed burner, in comparison with the prototype, allows to improve the working conditions of the welder, as well as reduce it. costs for general ventilation.

5 Compared with the base object (a burner with an integrated suction), which provides for the collection of excreted hazards up to 75%, the proposed burner will improve the efficiency of the suction.

Claims (1)

Arc welding torch in protective gases, comprising a nozzle: for supplying a protective gas, a current supply nozzle, a suction nozzle, and a handle inside which there is a suction channel, a pipe for supplying a protective gas and current supply, characterized in that, for the purpose of improving the area of the review, increasing the amount of contaminated suction air, reducing the likelihood of a gas protection failure, as well as reducing the heating of the burner handle, it is equipped with a pipe for supplying compressed air, the outlet of which is located at the working end of the nozzle and facing the inlet of the suction nozzle, the suction nozzle is made in the form of a cone-shaped screen to protect the welder’s hand, located on the handle and facing the large base and inlet towards the burner nozzle, and the axis of the outlet the compressed air supply pipe intersects with the axis of the suction channel in the plane of the smaller base of the cone-shaped screen. ** ftrf