Patent ID: 8899502

Claim:
A method for controlling a crusher comprising a crushing mechanism with a cycle and an actuator for moving the crushing mechanism, the method comprising: defining a value of first data, the value indicating a power input in the actuator or a crushing force, and the value corresponding to a desired particle distribution of a crushed rock material produced by the crushing mechanism or a desired quantity of the crushed rock material produced by the crushing mechanism; crushing the rock material by operating the crushing mechanism; measuring an actual value of the data; and substantially and continuously adjusting a cycle frequency of the crushing mechanism during the crushing in order to change the measured value towards the defined value; wherein the crushing mechanism comprises: an eccentric shaft having an inner hole; a main shaft fitted within the inner hole of the eccentric shaft; a supporting cone configured to oscillate; an inner crushing blade mounted to the supporting cone; a frame surrounding the supporting cone; and an outer crushing blade mounted on the frame; wherein when the eccentric shaft is rotated, the supporting cone is entrained in an oscillating motion; and a gap between the inner crushing blade and the outer crushing blade varies at each point during the cycle.