| 摘要 |
PROBLEM TO BE SOLVED: To provide a grading control apparatus for threshing machine to control the variation curve of grading air flow with a winnower in a manner to be slower on a low-speed side relative to the intermediate position and sharp on a high-speed side. SOLUTION: Grading air flow generated by a winnower 1 is supplied to a grading chamber 2 to winnow a grading object. The adjusting step is smaller in a low air flow rate range and is larger in a high air flow rate range in the case of adjusting the grading air flow rate. Thereby, problems in the conventional method that the air flow rate generated by conventional winnower is increased or decreased at the same rate independent of the amount of the grading object flowing in the grading chamber to form the problems of the increase in the scattering of dust at a small amount of the object and defective grading at a large amount of the object to fail in achieving sure grading, are solved. COPYRIGHT: (C)2004,JPO&NCIPI
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