Classifying – separating – and assorting solids – Sifting – Plane sifters
Patent
1977-10-14
1979-09-11
Halper, Robert
Classifying, separating, and assorting solids
Sifting
Plane sifters
2093665, 209318, 209363, B07B 136
Patent
active
041674782
ABSTRACT:
A universal modular screening, classifying, cleaning and sizing machine for dusty material, comprising a frame which supports a screen box by means of cables permitting the free oscillation of the box; the screen box containing spaced parallel screens and having passages for the material to enter the screen box and to discharge same at various levels, including air flow entry and outlet channels, and at the bottom of the screen box, a mechanism to produce the oscillation of the screen box; wherein the mechanism for producing oscillation of the screen box is composed of overlying counterweights which are capable of being moved relative to one another, opening and closing in the manner of a fan, releasably clamped between a holder which is driven at variable speed and a rotating hub whose support shaft is fixedly attached to the bottom of the screen box and the oscillating mechanism is located away from the center of gravity of the screen box at the head of the machine toward the material infeed, producing an oscillation of the screen box in such a way that as the material enters an elliptical movement is produced transverse to the long axis of the machine, and progressively reducing the elliptical movement down the length of the machine to generate further along, longitudinal elliptical movement and at the end, a rectilinear reciprocating movement toward the discharge of the material.
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