SU1047528A1 - Apparatus for spraying powder polymer paints - Google Patents

Abstract

A DEVICE FOR SPRAYING POWDER POLYMERIC PAINTS containing a spraying chamber, sprays, ejectors, a pipeline for feeding and triboelectric powder charging, characterized in that, in order to improve the quality of the coating due to an increase in the charge of the threshold paint particles, the pipeline is made. a composite of a stationary section and a movable vertical section, provided with a drive of rotation about its axis.

Description

This invention relates to a technique for flooding tribostatic-charged powder paints and may find a wide use for applying protective and decorative coatings in automobiles. power, electrical, construction and other devices, weights.

A device for spraying polymeric powder paints is known, which comprises a spraying chamber, sprays, ejectors, a feed line and a triboelectric charging of a powder. ka, 1.

In this device, powder paint is electrostatically charged during transportation due to friction of particles against the walls of the pipeline, and is deposited on a grounded product.

The disadvantage of such a device is that we get (the particle size of 15-18 kV is insufficient for obtaining a quality coating, since the particle diameter of the powder paint varies over a large range of 103000 microns, and therefore, when passing the same trajectory. magnitude of the charge. As a result, the particles with the lowest charge may not generally settle on the product, and this will lead to a large loss of the formation of a poor-quality coating.

The aim of the invention is to improve the quality of the coating by increasing the charge on the powder paint particles.

i The goal is achieved by the —WHT in a device for spraying polymeric powder paints containing a spraying chamber, sprays, ejectors, a pipeline for feeding and triboelectric charging of powder, the pipeline is made composite: from a stationary section and a movable vertical section equipped with a rotating drive around its axis.

Fig. 1 shows schematically a device for spraying, a general view, in Fig. 2 a section through line A-A in Fig. one.

The device consists of a spraying chamber 1, a fluidizing tank 2, ejectors 3, nozzles 4, a pipeline consisting of a stationary section 5 and a movable vertical section 6, a drive 7, a pulley 8.

The pipeline is composite and its parts are made of fluoroplastic. Vertical section b of the pipeline is installed in the housing

the holder 9 by means of the fluoroplastic seal 10, which does not allow the powder particles to go outside and allows the pipe to slide in the holder 9 with slight friction. The device contains. Also transport-. Noah means 11, suspension.12, part 13,

The device works as follows. By the vehicle 11 on the suspension 12, the part 13 enters the spray chamber 1 of polymer powder paints. In the fluidization tank 2, the powder paint is suspended.

Compressed air with a pressure of 0.5 atm is supplied to the ejectors 3.

The powder particles are captured by the air and the powder-air mixture enters the pipeline section 5, and then into its movable vertical section b. Drive 7 and turn on. the vertical section of the pipeline begins to rotate around its axis. Passing through the vertical section of the pipeline 6 while rotating it at a speed of up to 1200 rpm, the powder particles, as a result of a sharp increase in their strength against the pipeline walls, receive a high potential of 35-38 kV, go to the sprayers 4 and settle on the grounded part 13. After that, the parts enter the furnace of the melting furnace (it is not shown where the sprayed material is melted and the coating acquires the required physical and mechanical properties.

Making the vertical part of the pipe line detachable with the possibility of rotating it around an axis at an adjustable speed allows the potential of the powder paint particles to be increased.

Adjusting the rotation speed from 0 to 1.200 rpm is necessary for

Providing the possibility of using the device for spraying powder paints of various grades (epoxy, polyester, polyvinyl butyres and others) with different particle diameters. Increasing the charge potential of paint particles provides better quality coatings, with greater (by

. compared to the prototype with a thickness of 150180 microns (against 120-170 microns in the prototype). The deposition time is 8–10 s (versus 10–15 s in the prototype. The preparatory device is not difficult to operate, ensures the stability of the spray parameters and improves the quality of the coating.

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Claims (1)

DEVICE FOR SPRAYING POWDER POLYMER PAINTS, containing a spraying chamber, sprayers, ejectors, a pipeline for feeding and triboelectric charging of powder, characterized in that, in order to improve the quality of the coating by increasing the charge of particles of the threshold paint, the pipeline is made. composite of a fixed section and a movable vertical section provided with a rotation drive around its axis. m SI □ about