In this paper, the current domestic thermal spraying technology is mainly used for parts repair and pre protective coating. The spray gun has a powder feeding structure and a single spraying function, which can not meet the needs of large component thermal spraying anti-corrosion on-site construction. Shaanxi Zhongke Surface Engineering Co., Ltd. has specially developed "plastic powder flame spraying" and "ceramic powder flame spraying" for thermal spraying anti-corrosion coatings. The spray gun adopts a multi-functional powder supply structure, which can use either a powder hopper on the gun or a large capacity powder feeder. Different nozzles can be replaced according to different powders, From then on, the new flame spraying equipment can ensure "reliable, practical, efficient and multi-functional spraying" in the construction of large projects, and meet the requirements of thermal spraying anti-corrosion coating in the field spraying construction of large components.

Keywords: thermal spraying anti-corrosion, plastic powder, flame spraying, ceramic powder flame spraying

1、 Overview

The series of products newly developed by Shaanxi Zhongke Surface Engineering Co., Ltd., such as ZK6018 plastic powder flame spraying machine, ZK8032 powder multi-function high-speed flame spray gun, ZK1232 powder fool subsonic flame spray gun, etc., are designed with computer CAD software and manufactured in military industry. Every part and every process has passed strict quality control. ZK series spraying equipment can be used in all occasions with oxygen, acetylene and compressed air to spray various thermoplastic powder, aluminum, zinc, babbitt alloy, copper, stainless steel and various metals conveniently and quickly, and ceramic powders such as nickel chromium carbide, tungsten carbide composite powder, aluminum oxide, titanium oxide, chromium oxide, zirconia and so on can be prepared to be wear resistant, corrosion resistant Heat resistant and oxidation resistant protective coating; Repair worn, corroded and incorrectly processed mechanical parts; Make up for the problem that electrostatic powder coating and fluidized bed coating limit the size of the workpiece, but can not spray large components, storage tanks and other on-site construction. This paper mainly introduces the flame spraying process of plastic powder.

ZK6018 plastic powder flame spraying machine

2、 Composition:

The whole set of equipment consists of ZK6018 high-power flame spray gun, powder feeder, pipeline and gas path control valve. Users can prepare 0.6m3/min air compressor, oxygen, acetylene gas and oxygen acetylene pressure reducing gauge and pipeline by themselves.

3、 Principle:

Flame spraying is to use a special powder feeder and flame spraying gun, generate heat with the help of oxygen acetylene flame, and use compressed air as the jet flame flow of protective gas to heat the sprayed plastic powder to the plastic or molten state, and spray it to the pretreated working surface to form a continuous, uniform and pore free plastic coating.

4、 Features:

4.1 Flame spraying of plastic powder, referred to as flame spraying, is mainly used for powder coating for corrosion prevention. It is characterized by thick coating, simple coating, portable equipment and on-site construction. In the research, development, manufacturing and engineering application of flame spraying equipment for many years, Zhongke Company has solved three key problems commonly existing in the flame spraying process: first, low spraying efficiency; Second, the powder feeder cannot feed powder evenly; Third, the spray gun is easy to heat and backfire, and it is difficult to spray continuously and stably for a long time. Based on the flame spraying equipment of SNMI Company in France and SCHORI Company in Britain, our company has improved the design and adopted a unique small cart type stainless steel large capacity powder feeder, which can be used for two spray guns to spray at the same time. The rotary air fluidized bed is equipped with a powder supply structure of an adjustable venturi powder aspirator and a powder cleaning ejector, and the long pipeline between the powder feeder and the spray gun is free of powder accumulation. Since the powder feeder is not under pressure, powder can be added without stopping the gun, which ensures that the spray gun is continuous, stable and even in all directions for a long time. The spray gun is designed with a special air mixing mode and a double-layer protective gas structure, and no backfire will occur during spraying. It can quickly spray various thermoplastic and thermosetting plastic powders such as EAA, cross-linked polyethylene, epoxy powder, chlorinated polyether, nylon series, etc.

Guangzhou Tuoshen Surface Treatment Co., Ltd., the spraying manufacturer, is preferred for purchasing spraying, Spray processing Factory, trustworthy