In the present study, designing a screw-conveyor separating system that can be adopted to the combines and examining some effective parameters on separating efficiency such as feed rate, screw-conveyor speed, screw pitch and moisture content were aimed. The separating efficiency was determined for wheat and barley. It was shown that all evaluated parameters have significant effects on separating efficiency statically. Also, the screw-conveyor speed was a most effective parameter. The highest separating efficiencies were about 92 and 85 for wheat and barley, respectively.
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