PROBLEM TO BE SOLVED: To provide a grain recovery device which can avoid loss of power and enlargement of device size while securing an expected feeding function of a bottom screw.SOLUTION: A bottom screw 5 arranged at a bottom of a grain tank 4 and used for discharging grains includes a spiral blade 50 erected at a periphery of a screw shaft 51, and is formed to feed the grains from a feed start point side toward a feed end point side along the axial line of the screw shaft 51. At the feed end side, there is provided a high function section 50b which is configured to make the grain feed amount per prescribed rotation by the spiral blade 50 toward the feed end point side become larger at the feed end point side than at the feed start point side.COPYRIGHT: (C)2014,JPO&INPIT【課題】底スクリューによる所期の送り込み機能を確保しながら、動力ロスや装置の大型化を避け得る穀粒回収装置を提供する。【解決手段】グレンタンク4の底部に配設された穀粒排出用の底スクリュー5は、スクリュー軸51の周部に立設された螺旋翼50を備え、スクリュー軸51の軸線に沿う方向で搬送始端側から搬送終端側へ穀粒を搬送するように形成され、搬送終端側に、螺旋翼50による所定回転数当たりの搬送終端側へ向かう穀粒搬送量が、搬送始端側よりも搬送終端側で多くなるように構成された高機能部分50bを備えている。【選択図】図3
