| 摘要 |
A pneumatic system for harvesting combines which is operable for pneumatically transferring clean grain to the grain tank and for pneumatically conveying the tailings to the threshing cylinder. The pneumatic system includes a clean grain collection tube and a tailings collection tube, each of which is provided with an airlock device which permits grain or tailings to be metered into the pneumatic system while preventing air or grain from escaping therefrom.
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