Particle size classifier

Details Particle size classifier Particle size classifier

1999-03-25

2001-04-24

Jillions, John M. (Department: 3653)

Classifying, separating, and assorting solids

Sifting

Drum sifters

C209S240000, C209S258000, C209S380000, C209S643000

Reexamination Certificate

active

06220446

ABSTRACT:

TECHNICAL FIELD
The present invention relates, in general, to the handling of materials and, in particular, to the separation of desired powder product (i.e. “fines”) from oversized, undesired components (i.e. “overs”) in feed material containing both.
BACKGROUND OF THE INVENTION
There are many types of equipment which handle bulk material in which particles of many different sizes are present and which must separate out desired size particles of from undesired, oversized particles. Generally, such equipment that is commercially available for separating out desired size particles fails to meet one or more of the following desired features:
(1) clean product separation, namely a distinct separation of desired size particles from undesired, oversized particles
(2) high screening efficiency, namely the separation of large percentages of the desired size particles
(3) high throughput capacity
(4) relatively dust free surrounding environment
(5) minimum material build-up on screens that affects separation, particularly static build up of material in the winter
SUMMARY OF THE INVENTION
A particle size classifier, constructed in accordance with the present invention, includes a housing and means for supplying feed material composed of product and overs. This particle size classifier also includes a vertically disposed separator unit mounted within the housing and which has a cylindrical screen unit through which product passes from within the cylindrical screen unit to space outside the cylindrical screen unit within the housing and within which overs are retained. The separator unit also has a plurality of horizontally disposed perforated circular plates fixed to and within the cylindrical screen unit at spaced intervals along the length of the cylindrical screen unit and through which feed material passes downwardly. A particle size classifier, constructed in accordance with the present invention, further includes a vertically disposed center pipe extending through the plurality of circular plates and to which the plurality of circular plates are fixed. This center pipe has at an upper end means for conducting feed material from the feed material supply means to the center pipe and from within the center pipe to within the cylindrical screen unit and at a lower end means for conducting overs from within the cylindrical screen unit to the center pipe and from within the center pipe to a container for overs. Also included in a particle size classifier constructed in accordance with the present invention is a blowback air unit mounted within the housing spaced from the cylindrical screen unit and extending parallel to the cylindrical screen unit for supplying blowback air into the cylindrical screen unit. This particle size classifier further includes means for imparting rotary movement to the center pipe and means for conducting product from the space outside the cylindrical screen unit within the housing to a container for product.


REFERENCES:
patent: 1839941 (1932-01-01), Zelezniak
patent: 3349911 (1967-10-01), Reddick
patent: 4310412 (1982-01-01), Murakami et al.
patent: 4461702 (1984-07-01), Furukawa
patent: 1193344 (1965-05-01), None
International Search Report dated Jun. 29, 2000.

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