| 摘要 |
<p>A cleaning system (100) for a combine harvester is provided, comprising a sieve assembly (110), a sieve drive and a louver drive (370). The sieve assembly (110) comprises at least one sieve (110.1, 110.2, 110.3) for receiving a flow of harvested and threshed crop, the sieve comprising a plurality of spaced apart louvers (120, 210, 310) forming apertures for separating grain from the flow of harvested crop, the louvers extending in a direction substantially perpendicular to the flow of harvested crop. The sieve drive is arranged to apply a reciprocating back and forth sieve movement, at a first frequency fl, to the sieve (110.1, 110.2, 110.3) for propagating the flow of crop from a front end of the sieve (110.1, 110.2, 110.3) to a back end of the sieve (110.1, 110.2, 110.3). The louver drive (370) is configured to apply a reciprocating louver movement to the louvers (120, 210, 310) at a second frequency f2, whereby f2 ≥ f1.</p> |
