Electric arc spray gun for coating spraying

Abstract

The invention relates to the technical field of spraying equipment, and discloses an electric arc spray gun for coating spraying. The spray gun comprises a spray gun head, and a contact tube is fixedly arranged on one side, close to a coating spraying side, of the spray gun head. According to the electric arc spray gun for coating spraying, through cooperation of a movable air pipe and a guide wheel, after wires make contact, the guide wheel stops rotating, then the movable air pipe moves towards one side of an air inlet pipe, and an air inlet hole enters the movable air pipe, so that the movable air pipe is in communication with the interior of the air inlet pipe; in the moving process, the wires reach a molten state, and air flow is introduced to blow out the molten coating after the wires are molten, so that the surface temperature of the wire rises quickly, the heat loss in the contact tube is reduced, the spraying time is shortened, and the spraying efficiency is improved; and meanwhile, the wires are connected with the guide wheels in parallel, so that feeding and melting of the wires are carried out alternately to form prepared materials, excessive wires in the contact tube are avoided, and material preparation in the contact tube is smooth.

Description

technical field [0001] The invention relates to the technical field of spraying equipment, in particular to an arc spray gun for film coating spraying. Background technique [0002] Arc spraying is a method of using the wire to generate an arc at the contact position after the wire is energized. The contact part of the wire is heated and melted into a droplet shape, and then moves towards the surface of the part under the blowing of the airflow, and forms a coating on the surface of the part. Thermal spray method. The wire materials used in arc spraying are basically non-ferrous metals and ferrous metals with good electrical conductivity. [0003] First of all, in the existing arc spraying, the internal jet airflow adopts continuous spraying, and the wire material is fed into the contact tip of the arc spray gun until the wire material melts into a droplet shape. Before the wire is melted, the temperature of the wire rises slowly due to the airflow blowing on the surface o...

AI Technical Summary

Problems solved by technology

[0003] First of all, in the existing arc spraying, the internal jet airflow adopts continuous spraying, and the wire material is fed into the contact tip of the arc spray gun until the wire material melts into a droplet shape. Before the wire is melted, the temperature of the wire rises slowly due to the airflow blowing on the surface of the contact part of the wire, resulting in a large heat loss in the contact tip, which in turn increases the spraying time and reduces the spraying efficiency; secondly, it takes a long time for the wire to melt time, while the existing electric arc spraying, its feed is continuous and uniform, so that when the wire is melted, it is easy to cause too much feed, so that the amount of melting is reduced, and then the contact nozzle is blocked

[0004] Secondly, in the process of coating the surface of the parts, due to the different thickness of the coating required, the amount of wire required during melting is different. When the amount of wire required increases, it is necessary to insert a wire with a larger diameter. , and after the amount of filament increases, if the same airflow is used to blow out, the amount of molten filament in the unit airflow will increase, and after the molten filament is mixed into the airflow, due to the sudden drop in temperature, the amount of filament in the unit airflow increase, and then the probability of collision between the molten wires increases, and the molten wires stick after the collision. After attaching to the surface of the part, it is easy to cause the surface coating of the part to be uneven. The lateral distance of the parabola formed after exiting is shortened, which in turn causes material waste

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