| 摘要 |
PROBLEM TO BE SOLVED: To improve second crop separatory performance through solving the problems that, conventionally, apart from a blow winnower for feeding the main separatory wind, a separatory fan for blowing preliminary separatory wind into a separatory chamber is installed in the space between a first receiving gutter and a second receiving gutter; in this case, the separatory wind does not flow along the underside of a first flowing grain shelf inclined vertically but flows in the direction of going away successively rearward off the first flowing grain shelf; thus, a satisfactory winnowing effect for second crop going beyond the top end of the first flowing grain shelf from the tip of a grain sieve cannot be afforded, resulting in the decline of second crop separation efficiency. SOLUTION: This thresher has the following scheme: a separatory fan is set up for blowing separatory wind from the space between a first receiving gutter with a first conveying spiral suspended axially inside and a second receiving gutter with a second conveying spiral suspended axially inside upward of a separatory chamber, and the separatory wind blown from the fan flows along the underside of a first flowing grain shelf receiving separated grains from a grain sieve and flowingly guiding the grains into a first receiving gutter located under the first flowing grain shelf and then rises while passing above the second receiving gutter.
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