Coating apparatus – With means to apply electrical and/or radiant energy to work... – Electrostatic and/or electromagnetic attraction or...
Patent
1981-03-27
1983-05-03
Lawrence, Evan K.
Coating apparatus
With means to apply electrical and/or radiant energy to work...
Electrostatic and/or electromagnetic attraction or...
118631, 118634, B05B 504
Patent
active
043817297
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to depositing powder on parts by an electrostatic powder-depositing method in accordance with which a cloud of electrified enamel powder is projected inside a cage containing the part to be covered. The powder adheres to the part by the effect of electrostatic forces. A subsequent heat treatment applied to the part transforms the layer of powder into an enamel coating. During powder-deposition, only some of the particles of powder become fixed to the part which is to be coated; the remainder of the particles of powder fall below the part or try to escape outside the powder-depositing cage.
BACKGROUND OF THE INVENTION
The applicant's French Pat. No. 7 833 945 discloses a powder-depositing installation of integrated type which includes at least a cage, a powder supply system, a powder-recovery tank, and recycling units which include a powder-filtering system placed inside the cage which simultaneously forms a powder storage and dosing tank and a powder-recovery tank.
The invention aims to produce an installation of this type which can be used to deposit powder on the inside of hollow parts.
While the cage in accordance with the above-mentioned patent allows powder to be deposited principally on flat parts, this requiring only one narrow opening for the insertion of the parts on which powder is to be deposited, the installation in accordance with the present application includes an opening of large dimensions which allows the insertion of hollow parts which are necessarily broader than a flat part. The increase in the dimensions of the opening increases the possibility of powder escaping towards the outside.
The invention aims in particular to prevent the powder from leaving via this large opening.
SUMMARY OF THE INVENTION
The invention provides an electrostatic powder-depositing installation for depositing powder in hollow parts of large dimensions, characterized in that it includes a powder-depositing cage which is open at the top and a powder-depositing unit placed beneath this opening so that the hollow parts vertically fit over the powder-depositing unit as they pass through the opening of the powder-depositing cage and in that the powder-depositing unit is rotatably mounted such that all the inside surfaces of the hollow part can be powder-covered.
The characteristics and advantages of the invention become apparent from the following description of one embodiment of the invention given by way of example with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 is a schematic elevation, partially in section of a powder-depositing cage in accordance with the invention.
FIG. 2 is a cross-section along line II--II of FIG. 1.
FIG. 3 is a schematic elevation, partially in section of a variant of a cage.
FIG. 4 is a cross-section along line IV--IV of FIG. 3.
FIGS. 5(a) through 5(d) are sectional views about line V--V of FIG. 3 showing the nozzle-holder rotation control unit in four positions with the powder-depositing gun in phantom lines.
FIGS. 6(a) through 6(d) are plan views illustrating schematically four positions of a part on which powder is to be deposited, said powder being inside the powder-depositing cage, with the powder-depositing nozzle in each of the four positions.
DESCRIPTION OF PREFERRED EMBODIMENTS
In the embodiment illustrated in FIGS. 1 and 2, the installation includes a cage 1 provided with a wide, parallelepiped horizontal opening 2 in its upper end for inserting the parts to be treated. The cage has an outer wall 3 and an inner wall 4 which forms a parallelepiped powder-depositing chamber for the parts to be treated. Walls 3 and 4 form together an air recycling box or peripheral chamber.
The cage has e.g. two filtering elements 8, only one being shown, connected to an aspiration box 9 which contains an unclogging unit 10 to recondition the filtering elements.
Air laden with powder descends via the central portion of the powder-depositing chamber then rises up the sides between the walls 3 and 4 under the aspiration effe
REFERENCES:
patent: 3279421 (1966-10-01), Tilney et al.
patent: 3537426 (1970-11-01), Spiller
patent: 3905785 (1975-09-01), Fabre
patent: 4301764 (1981-11-01), Campion et al.
Compagnie Europeenne pour l'Equipment Menager "CEPEM"
Lawrence Evan K.
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