Classifying – separating – and assorting solids – Fluid suspension – Gaseous
Patent
1992-08-24
1995-02-14
Dayoan, D. Glenn
Classifying, separating, and assorting solids
Fluid suspension
Gaseous
209474, 366101, 406 88, B07B 400, B65G 5316
Patent
active
053887042
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a distribution plate for use in conveying and separation apparatus.
2. Description of the Art
There are a number of known forms of apparatus which are used for the conveying and/or separation of material such as, for example, tobacco leaf and stem, tea, cereal and other bulk material, using an air stream.
W089/04802 describes both a conveying apparatus and also an apparatus for separating different grades of a material. Both forms of apparatus use a distribution plate which has a plurality of apertures through which a fluid such as air can flow. The distribution plate is adapted to direct the fluid therethrough in a direction which has a component extending along a surface of the plate as a result of which material disposed above the plate is fluidized and conveyed along the surface of the plate.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a distribution plate for a conveying or separating apparatus of the type in which material is conveyed by or separated by an air stream. The distribution plate has a plurality of apertures for directing fluid flow therethrough in a direction which has a component extending along a surface of the plate and wherein the apertures extend through the plate at respective angles to the surface of the plate in the range of substantially 65.degree. to 85.degree..
Advantageously, selected apertures extend at different angles to the surface of the plate with respect to selected other apertures.
Advantageously at least some of said apertures are at an angle of 70.degree. to the surface of the plate.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings:
FIG. 1 shows in diagrammatic form a side view of one example of a conveying apparatus incorporating a distribution plate in accordance with the invention;
FIG. 2 is a cross sectional view laterally through the apparatus of FIG. 1;
FIG. 3 is a plan view of part of the apparatus of FIG. 1;
FIG. 4 shows to an enlarged scale the detail of the part of the apparatus shown in FIG. 3;
FIG. 5 shows a modified form of the part of the apparatus shown in FIG. 3;
FIG. 6 is a diagrammatic side elevation of a separating apparatus incorporating a distribution plate in accordance with the invention; and
FIG. 7 is a cross sectional view of part of the apparatus seen in FIG. 6.
FIG. 8 is a cross-sectional view showing apertures extending through a distribution plate at an angle in a range of substantially 65.degree. to 85.degree. to the surface of the distribution plate, where selected apertures extend in different directions.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIGS. 1 and 2, the conveying apparatus comprises a conveying trough 10 having a base wall defined by a distribution plate 11 and side walls 12. The trough 10 is closed by a loose fitting cover 13. The base wall of the trough 10 may comprise in section, a central flat portion and side portions which incline upwardly and outwardly to the lower edges of the side walls 12 and furthermore, the side walls 12 may incline inwardly by a small amount. A feed hopper 14 is located at the inlet end of the apparatus and material fed to the hopper 14 falls down an inclined member and is deposited onto the distribution plate 11. Beneath the conveying trough 10 there is formed a first plenum chamber 15 to which air is supplied by means of a fan 16, the air passing through apertures to be described in the distribution plate 11 into the conveying trough 10. The air leaves the trough 10 through apertures in the side walls 12 thereof and flows into a pair of second plenum chambers 17 and is conveyed back towards the fan 16 for recirculation. In use, materials, such as tobacco, is loaded into the hopper 14 and is conveyed, as will be explained, along the trough 10 to the outlet end of the apparatus.
The distribution plate 11 will now be described with reference to FIGS. 3 and 4. The arrow A indicates the direction of flow of the material along the trough 10 and it
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Dayoan D. Glenn
Nguyen Tuan N.
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