Applies to food, feed and processing of raw grain cleaning, food warehouses and other industries. To clean up corn, wheat, rice and soybean in raw grain, such as wheat straw, coen leaf, corn on the cob, straw, stone, rope and other debris. High output. good effect in cleaning, small power consumption, simple structure, small footprint. Device to open the access door is convenient for daily maintenance and repair, and a cylindrical screen and easy to change. Side and top cover to open the two observation windows, ease for onservation equipment operating conditions. According to the material nature matching suitable sieve, to achieve the best effect.