1.The machine is human designed, which is easy to control and has lower noise. 2.Rational design of crushing chamber, increase the screening rate. 3.Easy to realize two functions of coarse and fine grinding. The grinding efficiency is increased. 4.The coarse or fine grinding can be realized by adjusting the gap between the hammer and sifter, thus one machine can be used as two. 5.The shifting automation operating door allows easy overhaul and easy hammer sheet replacement.