Crusher and control method for a crusher
View Patent ↗A method for controlling the crusher, which crusher includes at least a frame, a crushing means with a cycle, as well as an actuator for moving the crushing means. In the method, at least first data is determined, which is at least one of the following: the power input in the actuator, the crushing force, the particle distribution of the crushed material produced by the crusher, or the quantity of crushed material produced by the crusher. The cycle frequency of the crushing means is controlled on the basis of the first data. The invention also relates to a crusher, in which the cycle frequency of the crushing means is adjusted according to control data from the control unit.
1. 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.
2. The method according to claim 1 , further comprising:
adjusting the cycle frequency within a cycle range in order to achieve the desired particle distribution without exceeding any of the defined values.
3. The method according to claim 1 , further comprising:
adjusting the cycle frequency within a cycle range in order to achieve a maximum quantity without exceeding the defined value.
4. The method according to claim 1 , wherein the cycle frequency of the crushing mechanism is changed by a frequency converter affecting a rotational speed of the actuator.
5. The method according to claim 1 , further comprising:
determining a highest available power input in the actuator; and
adjusting the cycle frequency of the crushing mechanism in such a way that the power input in the actuator substantially corresponds to the highest available power.
6. The method according to claim 1 , further comprising:
determining a highest available crushing force; and
adjusting the cycle frequency of the crushing mechanism in such a way that the crushing force substantially corresponds to the highest available crushing force.
7. The method according to claim 6 , wherein:
by increasing the cycle frequency, relative amounts of small particles in the crushed rock material are increased; and
by reducing the cycle frequency, relative amounts of large particles in the crushed rock material are increased.
8. A crusher for crushing a rock material, the crusher comprising:
a crushing mechanism with a cycle, the crushing mechanism comprising:
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;
an actuator for moving the crushing mechanism;
a control unit that defines 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 the crushed rock material produced by the crusher or a desired quantity of the crushed rock material produced by the crusher;
a measuring device that measures the actual value of the data; and
an adjusting device that substantially and continuously adjusts the cycle frequency of the movable crushing mechanism during the crushing in order to change the measured value towards the defined value.