| 摘要 |
A combine harvester, comprising a thresher unit (6), including a threshing cylinder (17) having its axis arranged transverse the longitudinal axis of the harvester and a thresher concave (8) in the form of a concave grille surrounding the lower part of the threshing cylinder (7) and defining therewith a passage for traversal by the crop harvested by the harvester in a direction parallel to the longitudinal axis of the machine. The combine harvester further includes a cleaning unit (18) including a pivoted bin (19) bearing at least two cleaning screens (20, 21) one above the other, conveyor means (10) which receive the grain separated by the thresher unit (6) and drop it on to the cleaning unit (18), means (23, 25) for directing a current of air at the product (P) which falls on to the cleaning unit (18) so as to separate the lighter chaff from the grain, a transverse accelerator roller (16) located beneath the discharge end (11) of the conveyor means (10) to accelerate the fall of the product, and a fixed wall (17) adjacent the accelerator roller (16) and defining therewith a passage through which the grain leaving the conveyor means (19) is accelerated, the fixed wall (17) being so formed as to incline the fall of the product (P) accelerated by the accelerator roller (16) relative to a vertical transverse plane. |
