PROBLEM TO BE SOLVED: To set a threshold in response to the amount of harvested grains, and control the amount of grains discharged from a dust-discharging port on the basis of the set threshold.SOLUTION: A charging port sensor 23b is disposed in a charging port 23a for sending out grains into a grain tank 4, and discharged amount detection sensors 34 are disposed in a dust-discharging port 33 and an exhausting passage 37. A threshold is set on the basis of the grain amount detected with the charging port sensor 23b, and when a grain amount detected with the discharged amount detection sensors 34 is larger than the set threshold, the operations of a dust-sending valve 10a and a treating cylinder valve 13a are controlled to reduce the amount of the grains discharged from the dust-discharging port 33 and the exhausting passage 37.COPYRIGHT: (C)2010,JPO&INPIT【課題】収穫される穀粒量に応じて閾値を設定し、設定した閾値に基づいて排塵口から排出される穀粒量を制御する。【解決手段】穀粒タンク4へ穀粒を送出する投口23aに投口センサ23bを設け、排塵口33及び排気通路37に排出量検出センサ34を設ける。投口センサ23bにて検出された穀粒量に基づいて閾値を設定し、排出量検出センサ34にて検出された穀粒量が設定した閾値以上である場合に、送塵弁10a及び処理胴弁13aの動作を制御し、排塵口33及び排気通路37から排出される穀粒量を低減させる構成とした。【選択図】図2
