Abstract: The coarse slime sieve bend originally used at Madaotou Coal Preparation Plant was seen to often get plugged up in operation, leading to piling-up of slime on deck, which severely affected the dewatering efficiency of the bend. To tackle the problem, an automatic deck cleaning mechanism is developed, which can keep the openings of the deck always in a clear state. Practice shows that the use of the automatic cleaning mechanism can lead to improved dewatering effect, reduced moisture content of clean coal product and elimination of the problem previously encountered in operation of centrifuge with an uneven feed caused by clogging of bend openings and piling up of materials on deck, as well as improved economic result for the plant.