Stone beat stone: The material falls vertically and uniformly from the top of the machine. Some of them enter into the revolving impeller at high speed by the distributor and feed pipe, and are shot out from the discharge outlet of impeller by the action of the high-speed centrifugal force. Then at high speed they are smashed with another part of the materials that have been distributed around impeller by the distributor with umbrella distributaries. After smashing each other the material shall form whirlpool and impact many times caused by striking and attrition in the impeller and crushing chamber. Stone beat iron: The materials fall vertically and uniformly from the top of the machine, and enters into the revolving impeller at high speed by feed pipe. Then they are shot out from the discharge outlets of impeller by the action of high-speed centrifugal force, and at high speed strike and crush with adjustable reaction plate or reaction rod in the crushing chamber.