| 摘要 |
In a cleaning device for threshed crop material, the material is introduced into the upstream end of a drum by a coaxial auger feeder. An air flow whirling around the inner wall of the drum is created by a tangentially connected blower. Heavier fractions of the crop material (grain) tend to be flung against the drum wall and leave through grates into a closed conveyor system, creating dynamic air pressure in the drum. Chaff and straw tend to be held in vortex towards the central core of the drum and are discharged axially through the downstream end of the drum. Various alternative embodiments with multiple blowers, multiple air inlets into the drum, recirculation of the cleaning air, finger rakes in various dispositions inside the drum, crop material fed through the blower delivery duct and adjustable baffles for controlling air flow entering the drum are described.
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