Classifying – separating – and assorting solids – Plural – diverse separating operations – Gaseous suspension and sifting
Patent
1985-08-15
1987-07-07
Kashnikow, Andres
Classifying, separating, and assorting solids
Plural, diverse separating operations
Gaseous suspension and sifting
209 28, 209138, 2091392, B07B 900, B07B 300
Patent
active
046785604
ABSTRACT:
A cyclic screening apparatus (10) and method utilizes multiple air flows and differential air pressures to separate undersize and oversize particles from a mixture of 5 to 50 micron size particles. The apparatus (10) comprises a support (12) including a first conduit (14) connected to a blower (16). A lower undersize particle collecting housing (20) has a secondary air inlet (24) and outlet (26) connected to a suction fan (SF). A screen is clamped between the lower housing and an axially movable and pivotable upper receiving housing. An air distributor rotor (R) is slowly rotated below and directs the first air flow through the screen and into the upper chamber and through a lower portion (40) and against the bottom of lower housing. A rotary nozzle (80), with the help of incoming secondary air flow, disperses particulate material onto the screen below. Oversize particles are periodically vacuumed away by a suction fan (SF') drawing a third flow of air into, through and out a slotted collector arm rotated above the screen. In operation the volume of the first air flow, supplied to the air conduit at a predetermined pressure (P3), is less than the combined volume of the first and second flow drawn out of the lower collecting chamber. Thus, the pressure (P1) in the upper chamber is less than the outside atmospheric pressure but greater than the pressure (P2) in the lower chamber.
REFERENCES:
patent: 3123551 (1964-03-01), Walker
The SWECO Turbo-Screen Classifier Manual revised & printed in 1977.
Article entitled "Screening Machines Can Be Fine-Tuned", from Chemical Engineering Magazine 3/4/1985.
Havig Egil
Lovsland Arnstien
Stole Kjell A.
Burkhart Patrick N.
Fred Walter
Kashnikow Andres
Norton Company
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