| 摘要 |
PROBLEM TO BE SOLVED: To provide a threshing device capable of improving the recovering efficiency of cereal grains (single grain ratio) in the front directional part of a threshing chamber by improving the treatment of secondary cereal grains. SOLUTION: This threshing device is provided by constituting a threshing drum 69 equipped at a threshing chamber 66 of the threshing device 15 with a first threshing drum 69a positioned at the beginning end in the conveying direction of the material to be treated and a second threshing drum 69b positioned at the final end side in conveying direction of the material to be treated and treating the secondary materials conveyed from a cereal grains-elevating tube 87 and also removing stuck grains happened in the first threshing drum 69a, and preventing the secondary cereal grains from hitting to a board material 81 and flowing out to the beginning end side of conveying direction by installing the board material 81 in between the first threshing drum 69a and second threshing drum 69b. Also, by making the number of rotations of the second threshing drum 69b larger than that of the first threshing drum 69a, it is possible to thresh-treat the most part of the cereal culms directly after the introduction into the threshing device 15 by the first threshing drum 69a having a small number of rotations and then perform the treatment of cut off ears and stuck grains mingling with straw culms and removal of branches from the branches and grains by releasing them by a second threshing drum 69b having a large number of rotation, so as to reduce third and fourth grains. COPYRIGHT: (C)2008,JPO&INPIT
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