Purpose: the grain cleaning screen machine is mainly used for wheat, rice, corn, soybean, cotton, camellia crops such as grain, seed selection, classification, is a multi-use of economical type cleaning machine. Structure: the machine by the rack and transport wheel, transmission parts, the main fan, gravity separation machine, suction fan, suction air duct, sieve box and so on, mobile and flexible, replace the sieve plate is convenient and good performance, etc.