SU651852A1 - Plant for applying coatings by dusting-on in static field - Google Patents

Description

The invention relates to the field of electrical engineering, in particular to installations for applying powdered polymer coatings in an electrostatic field.

A device for spraying in an electrostatic field is known, comprising a reservoir divided by a porous partition into a fluidization chamber and a pressurization chamber, a ceiling sheet placed between the conveyor and the reservoir, and a dust cover 1. A disadvantage of the known device is the difficulty of protecting the working area from dust particle size and impossibility applications for cases when polymer coatings are applied on a lengthy product continuously moving at a high speed, for example, a wire.

Closest to the invention is a spraying machine 2, comprising a fluidization chamber with a lid and openings For the passage of the product, a pressure chamber, a shut-off gas device, a charger and a high voltage source separated from it by a porous partition. In a known installation

The gas shut-off device is complicated in design and consists of nozzles connected to the gas system and facing into the hub of the fluidization chamber mounted in the openings of the nozzle.

The aim of the invention is to simplify the design.

The aim of the invention is achieved by the fact that in an installation for spraying coatings in an electrostatic field, containing a fluidization chamber with a lid and openings for the passage of the product, separated from it by a porous partition of the pressure chambers} 1, a stop gas device, corona electrodes and a high voltage source , the locking gas device is made in the form of reservoirs adjacent to the walls of the fluidization chamber and pressurization with output channels located in the openings of the fluidization chamber at an angle of 30-45 ° to its verti cial axis. Moreover, the lid of the fluidization chamber is made with holes and is provided with a dust collecting gasket, and the closures of the locking device are provided with gates. FIG. 1 shows the installation, a general view in section; in fig. 2 shows section A-A in FIG. 1. The installation contains a fluidization chamber 1 with a lid 2 in which holes b are drilled for the fluidizing gas passage, a dust collecting pad 3, a charging device 4, a porous partition 5, a pressurization chamber 6 into which fluidizing gas is supplied through fitting 7, fluidizing gas, tanks 8 , 9 of a gas-fired gas device, which are supplied with gas through nozzles 10 and 11, tongs 12 and 13, allow1 to further adjust the value of the locking pressure in the process of debugging the technological mode of coating the wire 14. Tanks for The porous device (see Fig. 2) is formed by side 15 and 16, front 17 and rear 18 walls of the fluidization and pressurization chambers and walls 19 and 20, having a shape that provides an inclined movement of the gas jet, locking the volume of the fluidization chamber. The tanks have Canada output in, located & num in the openings of the fluidization chamber at an angle of 30-45 ° to its vertical axis. For ease of installation and replacement of the porous partition, the installation is structurally made of two parts: the lower chamber and the pressurized part of the locking device and the upper fluidization chamber and the extension of the locking container. The installation works as follows. The plastic powder is poured into the fluidization chamber 1, transferred to a fluidized state by the action of a compressed gas, and charged from a charging device, which is a discharge electrode. An overpressure is created in the fluidization chamber; so that there is no removal of particles and powder into the surrounding space, turn on the gas supply to the reservoir1, 8, 9 of the locking device. The gas leaving the tanks creates an air damper at the wire inlet and outlet, I have A

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Claims (2)

This means that the potential is opposite in sign to the powder particles and does not allow the powder particles to enter the surrounding space. All gas passes through the dust removal pad 3 and b holes in the lid of the fluidizing chamber 1. The pressure in the tanks 8, 9 is controlled by the slides 13. Reducing powder entrainment, on the one hand, improves the technological parameters of the coating and ultimately their quality, since it is easiest the fine fraction itself is carried away, on the other hand, it improves the sanitary and hygienic working conditions. Claims 1. An electrostatic spray coating unit comprising a fluidization chamber with a lid and openings for the passage of the product, a pressure chamber separated from it by a porous baffle, a shut-off gas device, charging electrodes and a high voltage source, characterized in that In order to simplify the design, the gas shut-off device is made in the form of fluidization chambers and pressurization chambers adjacent to the walls of the reservoirs with outlet channels located in the openings of the coal-fired fluidization chamber m 30-45 ° to its vertical axis. 2. Installation according to Claim 1, characterized in that the lid of the fluidization chamber is made so that it is provided with a dust collecting pad. 3. Install by. Claim 1, characterized in that the locking device tanks are equipped with drawers. Sources of information taken into account during the examination 1. USSR author's certificate No. 422640, cl. B 05 B 5/02, 1972. 2. US patent number 3396699, cl. 118-634, 1968.