SU856573A1 - Unit for applying powdered materials - Google Patents

Description

I

The invention relates to the technological equipment of paint and varnish technology and can be used to apply powder materials in order to protect the surfaces of ferrous, non-ferrous metals and other materials, including plastics, anti-corrosion, decorative and electrical insulation coatings.

A known apparatus for applying powder materials in a cloud of charged particles, polymer coatings, comprising a housing divided by a porous partition into a blowing chamber and a fluidized bed chamber. Electrodes (ionizers), electrically connected to a high voltage source, are located on the porous partition. A conveyor is placed above the fluidization chamber.

 However, the installation may apply powder coatings.

materials mainly grids, wire, metal sheets and other products that are relatively small in height (up to 150 mm). For products that are over 150 mm in height, it is difficult to obtain a uniform coating due to the separation of powder particles by size during the transfer process in the interelectrode space.

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 Closest to the proposed technical equipment and the achieved result is the installation for applying powder materials containing a fluidized bed chamber, a spraying chamber located between them, powder charging electrodes and installed in the fluidization chambers for supplying and extracting powder f2.

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The disadvantage of this installation is the implementation of the device for the supply and selection of powder in the form of ejectors placed along the height of the chambers.

fluidization, which leads to the selective selection of the powder according to the diaperity in dependence on the location of the ejector. This ultimately leads to an uneven distribution of the powder in the dispersion and in the sputtering chamber.

The purpose of the invention is to improve the quality of the coating.

 This goal is achieved by the fact that in an installation for applying powder materials, containing fluidized bed chambers, a spraying chamber located between them, electrodes for charging powder and devices for powder supply and extraction installed in the fluidization chambers, the latter are made in the form of compressed gas distribution collectors at the bottom of the fluidization chambers and connected to the gas supply interrupters with which the unit is equipped

La fig. 1 shows a powder coating setup; in fig. 2 is a diagram of a distribution manifold of compressed gas; FIG. A-A, FIG. 2

The sputtering chamber 1 is connected to two fluidized bed chambers 4 by means of sockets 2 in which electrodes (ionizers) 3 are installed. Each chamber 4 of the fluidized bed is separated from the chamber 5 by blowing a porous partition 6. In the chambers 4 of the fluidized bed there are distribution manifolds 7 of compressed gas. A gas supply breaker 8 is installed on the gas pipeline supplying compressed gas (air) to the collectors.

The sprayed product 9 mounted on the conveyor 10 is placed in the spray chamber 1. The product 9 is grounded. Electrodes 3 are electrically connected to high voltage source 11. A collector 12 is located in the lower part of the sputtering chamber for the regeneration of non-deposited powder.

The operation of the installation is carried out in the following way.

When compressed gas is supplied to the blowing chamber 5, a fluidized bed is created in the chamber 4. The electrodes 3 are supplied with voltage from a high voltage source 11. After that, compressed gas is supplied to distribution manifolds 7. Under the action of gas jets coming out of manifolds 7, uncharged powder particles in the fluidized bed from chamber 4 rush into sputter chamber 1 to product 9 (adjusting the distance from electrodes 3 to item 9 is made by extending or replacing the sockets 2). Passing through the sockets 2, the powder particles get charged from the electrodes 3.

Flows of charged powder particles from two chambers 4 of the fluidized bed meet in chamber I, create a turbulent movement of a cloud of charged particles, which are uniformly deposited on product 9, under the action of opposite charges of the product and powder particles. The non-settled powder particles are collected in the I2 collector and reused. Upon termination (interruption) of the supply of compressed gas powder supply to

camera 1 is terminated.

The gas interrupters 8 supply the gas in pulses. The number of pulses and the interval between them is chosen depending on the required thickness of the coating, the size of the parts, the properties of the powder, etc.

This plant allows the powder, which is constantly in a fluidized state, to be supplied in portions into the sputtering chamber 1 to create a uniform distributed cloud of charged particles in it and, if necessary, to stop its supply relatively quickly.

This makes it possible to economically use powder, to obtain high-quality coatings, to automate the process of applying powder to products of a complex configuration with a height of no more than 150 mm.

Claims (1)

Invention Formula An apparatus for applying powder materials, comprising fluidized bed chambers, a spraying chamber, an electrode for charging powder and placed in the fluidization chambers, powder supply and removal equipment, which, in order to improve the quality of the coating, powder selection is performed in the form of