CLEANING METHOD

To provide a method in which a tub that receives powder dust dropping from a belt conveyor can be cleaned with a smaller amount of water than before.SOLUTION: In a method in which water is supplied intermittently to an upper part of an inclined tub that receives powder dust dropping from a belt conveyor having a roll for propping-up a return-path belt arranged therein to clean the tub, the tub is cleaned in multiple cycles, in one cycle of which first-half cleaning, last-half cleaning and intermittent leaving until the next cleaning are performed, and volumes of water with which the tub is cleaned are set so that water volumes in the first-half cleaning are smaller than water volumes in the last-half cleaning and a period of time for the intermittent leaving is set to 5 minutes or more and 40 minutes or less.SELECTED DRAWING: Figure 7 【課題】ベルトコンベアから落下する粉塵を受け止める樋を、従来に比べて少ない水量で洗浄することが可能な方法を提供する。【解決手段】復路ベルトを下支えするロールが配置されたベルトコンベアから落下する粉塵を受け止める傾斜させた樋の上部に間欠的に水を供給して該樋を洗浄する方法であって、洗浄前半、洗浄後半、及び次回洗浄までの間欠放置を１サイクルとする複数サイクルによって樋を洗浄することとし、樋を洗浄する水の量を洗浄前半の水量＜洗浄後半の水量、且つ間欠放置の時間を５分以上４０分以下とする。【選択図】図７