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When vertical shaft impact crusher works, aggregates are forced into the crushing chamber at a speed of 40-100m/s under action of centrifugal force. The suspended aggregates collide violently with the liner and move upward along the piling surface and then deflect downward. They crush against the aggregates spurted out by the impeller, lose energy and then discharged from the crushing chamber. Its major functions are impaction and grinding, as well as crushing.