SU494196A1 - Device for painting interior surfaces of long products - Google Patents

Description

The invention relates to the manufacture of long articles with anti-corrosion coatings and is intended for applying a paint coating on the inner surface of long articles, for example pipes.

A device for coating the inner surface of long articles, such as pipes, is provided with a blower, a device for blowing the sprayed material, sealing joints and a circulation pipe.

The disadvantages of such a device are the impossibility of obtaining a sufficiently uniform coating and clogging of the system due to the circulation of the powder in a closed system.

In order to eliminate these drawbacks, it was proposed to create a vacuum before applying the coating in the product cavity using an injector installed outside the workpiece in the area of the clamping mechanism with the direction of the injecting jet from the product cavity.

The drawing shows the proposed device.

The device consists of a receiving bin separating screens, a clamping mechanism 2, an injector 3, a workpiece (pipe) 4, a nozzle 5, paint supply, a tank 6 with a paint and varnish material, a distribution mechanism 7, a pump 8 and pipelines.

The inner surface of long products painted on the proposed device as follows.

The product is conveyed by a transport mechanism under the guide funnels. Then the product is clamped by a clamping mechanism.

between the craters, i.e., the front hopper moves progressively under the action of the mechanism. To ensure leaktightness in the cavity of the product, the internal surface of the funnels is covered with rubber or the like.

material. At the moment of the clamping mechanism actuation, air is supplied to the injector from the compressor. A vacuum is created in the cavity of the pipe. After a certain time, the distribution mechanism is activated, consisting of an electropneumatic valve for two positions. For a short time, the valve connects the tank with paintwork material to the nozzle; at the same time there is a absorption of a certain portion of paint. Then

the valve is triggered again, blocking the paint from the tank; a passage opens in the valve for free air inflow from the environment, as a result of which the paint material passes through the cavity of the product being painted, forming

the walls are uniformly covered. Excess material is thrown into a receiving bin with separation screens. As excess paint accumulates in the bunker, it is pumped into the tank with a pump. The whole coloring cycle lasts 3-10 seconds. Sun device system is closed.

Subject invention

A device for painting the internal surfaces of long products, such as pipes, consisting of an iriem bin for spent dye, a clamping mechanism with pilot funnels, an injector, a distributor with a container for the dye, characterized in that, in order to evenly distribute the dye over the surface of the product and exclude clogging of the system, the injector is installed outside the workpiece in the area of the clamping mechanism with the direction of the injection jet from the cavity of the product.

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