Coating apparatus – Projection or spray type – Coating moving mass of solid particulate work
Patent
1995-05-02
1997-01-14
Edwards, Laura
Coating apparatus
Projection or spray type
Coating moving mass of solid particulate work
366293, 366295, B05C 500
Patent
active
055935001
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for coating solid particles with a solidifying layer derived from a liquid, molten material. The device includes a turbine which rotates in a housing and comprises two disk parts. The solid particles are supplied on one surface of one disk part while the molten liquid material is supplied in a hollow space located between the two disk parts. The liquid flows through an annular gap between the disk parts and into an annular space in the housing that carries the solid particles which have been spun off to the outside, for the purpose of coating the solid particles.
A device of this type has been known, for example, from EP 0 048 312 A1. In this device, the two disk parts forming the turbine are in mutual axial contact by blade ribs extending from the upper disk part in a downward direction into the hollow space, and forming between them flow channels for the liquid, normally a melt, that is thereby guided into the annular gap. If the delivery quantity of the molten material is to be varied, for example for obtaining different droplet sizes in the coating veil, then the turbine must be removed and replaced by another turbine having a different size annular gap, or spacers must be provided that vary the spacing between the disk parts. In both cases it is necessary to remove the turbine from the housing.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to design a device of the before-mentioned type in such a way that the height of the annular gap can be varied without the need to remove the turbine. For the purpose of achieving this object with a device of the before-mentioned type, a device is provided which enables the size of the annular gap to be adjusted the two disk parts which are arranged to be axially adjustable one relative to the other from the outside. According to a further improvement of the invention, this can be achieved in a particularly simple and advantageous way if the axial adjustment is effected by a central thread connecting the two disk parts, especially a fine-pitch thread, and if there are provided means that can be operated from the outside of the housing for rotating the disk parts one relative to the other, and means for fixing the relative positions of the disk parts. With this embodiment, a relative rotation of the disk parts, that can be effected from the outside, is sufficient to effect a desired, normally only insignificant, variation of the annular gap.
According to a further development of the invention, the rotating means are constituted by an adjusting pin which projects through a slot, that extends over part of the circumference of the housing, and which engages radially a first disk part, while the second disk part is advantageously provided with a protection against rotation. Thus, it is only necessary to stop the turbine and, after removal of a locking means, to rotate the two disk parts one relative to the other by a given angle, whereby they are axially adjusted in the desired way via the fine-pitch thread.
According to a further development of the invention, the protection against rotation consists of a locking pin that projects through a housing cover and is supported on the surface of the second disk part. The means for fixing the relative positions of the two disk parts may consist in this case of a locking pin engaging the disk parts in radial direction.
According to a further, particularly advantageous embodiment of the invention, the locking pin may be screwed radially into a thread provided in the second disk part, and the adjusting pin may be arranged for axial and non-rotatable connection with the locking pin. This feature enables the locking pin to be initially moved out of its locking position by means of the adjusting pin that has been introduced from the outside, for effecting the adjustment. Thereafter, once the protection against rotation for the second disk part has been mounted, the desired adjustment can be effected. Finally, the locking pin is scr
REFERENCES:
patent: 3269660 (1965-10-01), Graham
patent: 4690834 (1987-09-01), Appelgram et al.
patent: 5132142 (1992-07-01), Jones et al.
patent: 5284678 (1994-02-01), Hirschfeld et al.
Kleinhans Matthias
Konig Axel
Michelic Janez
Edwards Laura
Santrade Ltd.
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