1 This machine can replace Gravity separator .If need feed into the Gravity separator, can improve the purity of grain/seed . So as to reducing the load of Gravity table, increase the production ; 2 For the processing of wheat, rice, corn, soybean, sorghum and other commodity grain, productivity can reach 25t/h. and can remove more than 90% blighted seed, budding seed, damaged seed (by insect), rotten seed, deteriorated seed, moldy seed, non-viable seed, seed with black powder sick; 3 Selecting grain by air screen, gravity table, vibrating screen. Labor, energy saving and consumption reducing; 4 vertical air sieve structure, equipped with a cyclone duster system, Environmental, no large dust leakage; 5 It can be equipped with elevator, screw conveyor, belt conveyor,is flexible and convenient.