Operating Principle: the materials straightly fall into high-speed rotating  impeller turnplate from the top of the machine, under the effects of high-speed centrifugal force, have high-speed crash and high-density crush. With the target stone which flowing around the impeller in umbrella form, after mutual impaction, they will form eddying motion between the turnplate and the machine case, then cause a number of mutual impacts, friction, crushing until they are crushed into the required size.