| 摘要 |
In an axial flow type combine, an improved concave is provided which remains open in the most adverse corn harvesting conditions, thereby increasing the overall efficiency of the machine. The improved concave comprises a frame formed by a plurality of spaced-apart transversely extending arcuate shaped support members joined together at their respective ends by a pair of spaced-apart longitudinally extending support elements. The frame supports a plurality of spaced apart longitudinally extending rod-like members which are generally linear throughout a substantial portion of their longitudinal extent, the linear portions of the respective rod-like members being generally parallel to the axis of a rotor positioned above the concave in the combine. The rod-like members are provided with rotatably mounted sleeves which freely rotate about the rod-like members as crop material moves over the concave. These rotatable sleeves facilitate the passage of threshed crop material through the openings in the concave defined between the sleeves and further serve to reduce the impact of the crop material against the concave, thereby resulting in less crop damage.
|
