1 This machine can replace gravity separator when used in processing seeds, grains, and beans and improve the purity of materials, thus reducing the load of gravity table and increasing production further. 2 For the processing of wheat, rice, corn, soybean, sorghum and other commodity grain, productivity can reach 20t/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, which can save energy and reduce consumption and labor.