Patent attributes
A system for cleaning a flow of harvested crop, including a conveyor to convey the flow downstream of the conveyor into a cleaning zone into which the flow is discharged, and a cleaning unit located above the cleaning zone and operable to generate an upward air flow through the cleaning zone for extracting residues contained in the discharged flow. The system further includes at least two conveying rolls that are disposed behind a downstream end of the conveyor in an upstream part of the cleaning zone to be fed with the flow of harvested crop discharged from the conveyor. The conveying rolls are arranged to convey the crop flow and to discharge it into a downstream part of the cleaning zone. Passages are formed between or through the rolls, and are arranged to allow an upward air flow therethrough for extracting residues from the crop present on the conveying rolls.