It is a new model machine used in the Preliminary Cleaning of Corn and Legumes in the flour mills and the wheat storage silos. Due to the drum sieve, a successful cleaning is made at high tonnages. It provides high efficiency in the separation of undesired rough materials. By way of using square-perforated sieve instead of a round-hole sieve, sieve area is widened. With easy sieve change and assemblage, it is a trouble-free machine. In this model, the problematic materials such as belt, pulley, oscillation block, and suspension road are not used. Besides flour mills, it is used as a classifier in every sort of cereal facilities.