Classifying – separating – and assorting solids – Sifting – Drum sifters
Patent
1994-10-06
1995-12-12
Rollinger, David H.
Classifying, separating, and assorting solids
Sifting
Drum sifters
209290, B07B 122
Patent
active
054741866
ABSTRACT:
A cylindrical classifier includes a first rotating cylinder having a surface composed of parallel separator rods or tubes that extend along the length of the cylinder. The tubes or rods are spaced from each other to prevent oversized objects from passing between them. Material to be classified is fed to the interior of the cylinder. As the cylinder rotates, objects of the desired size and smaller objects pass between the spaced separator rods and exit the cylinder. The first cylinder is surrounded by a second coaxial cylinder so that there is a space between the first and second cylinders. The outer cylinder has a separating screen which prevents objects of a desired size from passing through. The coaxial cylinders rotate about an axis that is slightly inclined relative to the horizontal so that as the cylinders rotate, oversized pieces are discharged at a lower end from the interior of the inner cylinder, desired sized pieces are discharged at the lower end from the interior of the outer cylinder, and undersized pieces are discharged through the screen of the outer cylinder.
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Fulghum, Jr. Oscar T.
Fulghum, Sr. George H.
Fulghum Industries, Inc.
Rollinger David H.
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