SU1364229A3 - Device for electrostatic applying of coating materials - Google Patents

Abstract

This invention relates to a technique for coating granular products, for example, granules, seeds, and powders. The purpose of the invention is to increase the uniformity of the coating by inducing a charge on the product opposite to the polarity of the sprayer. The product to be coated is agitated and transferred using a paddle stirrer 4, a rotating hopper, a conveyor belt or rotating drums. In the course of the transfer, the product passes successively under the nozzles 13 and the devices 14 for dispersing the powder. First, the spraying operation is carried out by repeatedly passing the products under the sprayers 13. The product thus moistened is then also repeatedly passed under the device 14 to spray the powder surface onto its surface. The movement of the particles of the coating material in the form of a sprayed liquid and / or scattered powder occurs along power lines passing from the electrode of the spraying device to the product to be coated. 6 hp f-ly, 4 ill. § O) from 00 to 4; youn

Description

11364229

This invention relates to an electrostatic coating technique for granular products, e.g. granules,

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seeds, powders, and can be primarily used in the food, chemical and pharmacological industries.

The purpose of the invention is to increase the uniformity of the coating. Figure 1 schematically presents the proposed device, the cross section; ka of Fig. 2 is an embodiment of the device in which the movement and mixing of the product is carried out with the help of a rotating bunkerJ in Fig. 3 - the same, the movement and mixing of the product is carried out with the help of a conveyor, - in Fig. 4 - the same, movement and mixing the product is done with cylindrical drums.

The device (FIG. 1) contains a material loading means 1, a screw feeder 2, a container 3, a mechanism for mixing and moving the product, made in the form of a paddle agitator.

4, motor 5 with drive 6, bottom with holes 7, inclined plate 8, discharge screw 9, coating unit, made in the form of a bearing structure 10 with brackets 11, onto which sprayers 13 and devices 14 are attached to the hinge joints 12 powder dispersion connected to a high-voltage source with extension heads 15 and nozzles 16.

The device in FIG. 2 contains a rotating hopper 17 mounted on the bed 18. The bottom part of the 19-bunker 17 is covered with an electrostatic shield shield material 20,

The device in FIG. 3 comprises a conveyor 21 with a concave surface and pulleys 22 mounted on a supporting frame 23.

The device in FIG. 4 comprises successively installed revolving drums 24 and 25.

The device (figure 1) works as follows.

The product to be processed is fed by means 1 of loading material into screw feeder 2, from where it is transferred to tank 3. In the tank, using the blade of the agitator 4, driven through the drive shaft 6 during rotation from the engine 5, the product is circulated and stirred. During the re

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The agitating product moves radially to the periphery of the container 3 and pours out through the bottom opening onto the inclined plate 8 and then is removed with the aid of a discharge screw 9.

The hinge joints 12 allow the guns 13 and the powder diffusing devices 14 to be installed at a desired angle, ensuring the desired direction of the electrostatic charged jet of the sprayed liquid and / or powder to the product circulating in the cavity of the container 3.

First, the liquid is sprayed during the radial movement of the product by repeatedly passing it through the sprayer zone 13. The product thus moistened is then repeatedly passed under the spray device 14 onto its powder surface.

In order to avoid interference that can be caused by the electric fields of two simultaneously operating devices 13 and 14, an extension head 15 is mounted on the device 14 for dispersion, extending the nozzle 16 from the gateway 13 by a certain distance and approaching it to the circulating product with the accompanying device. this intensification of the induction process on the charge product from high-voltage sprayers connected to the source. At the same time, the charge on the product is induced by the charge of the opposite atomizer and polarity, which leads to the creation of an electrostatic attraction of the coating material to the product and their mutual attraction, providing a uniform coating.

The movement of the particles of the coating material in the form of a sprayed liquid and / or a scattered powder, the particles of which are produced by the microwaves due to the application of a potential difference (30-90 kV), occurs along power lines passing from the electrode of the spreader to the covered DUCTU product.

The grounding of the device nodes eliminates the phenomenon of counter-ionization, which can be accompanied by a potentially dangerous accumulation of residual charges.

The operation of the devices shown in Figures 2, 3 and 4 is carried out in an anatopic manner. Their differences are in the design of the mechanism for mixing and moving the product.

In the device shown in Fig. 2, the product is agitated and moved / by rotating the spherical bunker 17. When the bunker is rotated, its bottom is exposed by moving the product from the center outwards. In order to avoid electrostatic disturbance, the bottom of the hopper is covered with shielding material.

In the device shown in FIG. 3, the product is mixed and moved by lifting it on a concave conveyor belt with a continuous drop down.

In the device shown in Fig. 4, mixing and moving the product is carried out using two cylindrical drums, forming an inclined material feed path.

Claims (7)

1. Device for electrostatic application of coating materials, containing at least one raspypitel, installed with the possibility of directing a jet of sprayed material to the product and connected to a high voltage source, as well as a supply unit for the product to be coated, differing from the fact that in order to achieve uniformity cover, it is supplied 0 five five 0 0 five a mechanism for mixing and transporting the product in the spray area. 2. A device according to Claim 1, characterized in that one or several nozzles are installed in series on a bracket with the possibility of angular and reciprocating movement in the direction of the product. 3. Device according to Claims 1 and 2, characterized in that the mechanism for mixing and transferring the product is made in the form of a conveyor belt with a concave surface. 4. The device according to Claims 1 and 2, that is, that the mechanism of mixing and moving the product is made in the form of a spherical bunker mounted with a slope and with the possibility of rotation 5. A device according to claim 4, characterized in that the bottom of the hopper is covered with an electrostatic shield material. 6. A device according to Claims 1 and 2, characterized in that the mechanism for mixing and moving the product is performed in the form of one or several cylindrical drums with open ends installed rotatably. 7.- A device according to claims 1-6, characterized in that it is provided with successively installed liquid and powder nebulizers. . i / -V 22 WELL Phi2,3 fshl Editor M.Petrova Compiled by L.Yanushin Tehred L.Serdyukova Order 6386/58 Circulation 646 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader V. But ha