B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/58, 209/7
B07B 1/00 (2006.01)
Patent
CA 1192865
ABSTRACT A drum for separation of a bulk material into a heavier and a lighter fraction is arranged to be rotated around its central axis at a cer- tain velocity and to be traversed by a flow of air at a certain flow velocity. The drum has at least one discharge aperture for the heavier fraction and at least one discharge aperture for the lighter fraction further on in the drum (2) between the said discharge aper- ture for the heavier fraction and the said discharge aperture for the lighter fraction the drum is provided with rearward-feeding transport] members in the form of inwardly-directed spirals (27) fastened to the inside of the drum and arranged so that during rotation of the drum material is transported in the thread turn (28) between the spirals to the rear towards the said discharge aperture for the heavier frac- tion, also lifters (29, 30) for the bulk material arranged in the thread turns (27) and designed as barriers to prevent continued rear- ward feed of the bulk material in the thread turns concerned. The lifters are arranged in groups along the portion involved of the drum around the inside of the drum, and the groups can contain the same or different numbers of lifters and be arranged having the same of diff- erent pitch between the groups, but the distance (L) between the groups is such and the number of thread turns provided with lifter in each group is such that during each revolution of the drum on the whole more material of the heavier fraction is fed to the rear through each group via the free thread turns than is raised up by the lifters in the thread turns in the next following group, viewed in the direc- tion of air flow, which is blocked off by lifters and at the air velocity which is matched to suit drum diameter is blown some distance to the rear by the air flow when it drops down from the lifter as the drum rotates, whilst the lighter fraction is blown further forward so that the forward feed of this fraction is much greater than the rear- ward feed in the thread turns.
419212
Fetherstonhaugh & Co.
Scandinavian Farming Aktiebolag
LandOfFree
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