Dust discharging and preventing as well as cooling device for inner hole plasma spraying

Abstract

The invention provides a dust discharging and preventing as well as cooling device for inner hole plasma spraying. The device comprises an air draft dust-screening drum, an exhaust fan, a cooling air nozzle, a cooling air ring I and a support; a cylinder arranged on an upper side of the air draft dust-screening drum is communicated with the exhaust fan via an aluminum foil hose; a lifting mechanism is used to drive an inner hole spray gun to make vertical up and down movement with the air draft dust-screening drum and spray the inner wall of an inner hole workpiece fixed on a rotating mechanism; jet spots sprayed on the inner wall of the inner hole workpiece by the inner hole spray gun are externally locally reduced in temperature via the cooling air nozzle fixed on the cylinder; and open holes formed on the cooling air ring I blow cooling air to a gap to realize cooling and dust preventing for of the inner hole workpiece. The device can effectively reduce the temperatures of the inner hole spray gun and the inner hole workpiece in the inner hole spray process, ensure long-time work reliability of the inner hole spray gun and reduce coating heat stress on the inner wall of the inner hole workpiece and air flow interference and dust pollution of the inner hole workpiece.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and in particular relates to a dust exhausting, dustproofing and cooling device for inner hole plasma spraying. Background technique [0002] Plasma spraying uses a plasma flame (non-transferred plasma arc) to heat the introduced spray powder to a molten or semi-molten state, and under the action of the plasma flame, it hits the surface of the treated substrate at a high speed, and then spreads Flatten, spread, and finally form a coating with a lamellar structure. [0003] Inner hole plasma spraying is a plasma spraying method for preparing a coating on the inner wall of a circular hole (or barrel). When the round hole to be sprayed is deep, it is necessary to use a special inner hole plasma spray gun to spray in the inner hole environment. The plasma jet of the bore plasma spray gun is at an angle of 90° to the axis of the spray gun. Since the 1970s, Metco has successively developed ...

AI Technical Summary

Problems solved by technology

The spraying space in the inner hole is narrow, and the heat of the high-temperature plasma flame is not easy to dissipate, resulting in high ambient temperature, and the substrate and the spray gun are easy to overheat; the smoke and dust are difficult to discharge and will seriously pollute the coating during the discharge process, resulting in inner hole coating. layer quality is not guaranteed

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