The investigations of conical rotary cleaning unit, showed that the construction tested does not comply with the requirements, made to separating sets of modern combine harvesters especially in respect to its capacity. The best working factors of conical rotary separating unit were achieved at sieve drum rotational speed within the range of nb = 5-20 (r.p.m.) and nb = 60-70 (r.p.m.) and at capacity of q = 1.25 (kg·s⁻¹). Because of low flow capacity this separating unit can not be used in a new generation combine harvester. It can, however be used in other cleaning machines e.g. stationary.
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