Mill roller hanger on securing a 1000-1500 kg pressure high-strength spring. After the work began, in the milling machine high strength grinding roller around the spindle, and in high strength spring and the role of centrifugal force, to keep rolling mill ring, over the same pressure under dynamic conditions the other milling machine 1.2 times higher, the yield is greatly improved. When grinding material into high strength grinding grinding cavity by the mill, scoop up into a roller mill and mill ring rolling, the compacted powder with the circulating air blower into the analysis engine, qualified fine powder with gas flows into the cyclone powder collector for finished products, large particles fall back to the ground heavy grinding machine. Circulation air blower to return repeat the process above, it may enter the bag type precipitator purification. When the mill grinding roller and the grinding ring wear reaches a certain level, adjust high strength spring length, adhere to the mill roller and ring between constant pressure roller. Thus ensuring a stable yield.