Method for controlling the operation of a crusher, a mineral material processing plant and a control system

1. A method for controlling the operation of a crusher, wherein the method comprises:

measuring a quantity related to stress to which the crusher is exposed during the crushing of material;

determining a deviation value of the quantity related to stress;

comparing the determined deviation value to a reference deviation value;

in response to the determined deviation value differing from the reference deviation value, adjusting at least one default setting of the quantity related to stress, wherein adjusting the at least one default setting comprises increasing the default setting if the determined deviation value is lower than the reference deviation value and decreasing the default setting if the determined deviation value is higher than the reference deviation value; and

operating the crusher utilizing the adjusted default setting as a target value in control of the quantity related to stress to increase an efficiency of the crusher.

2. The method according to claim 1 , wherein the method further comprises prior to measuring the quantity related to stress, predetermining a default setting and an upper limit for the quantity related to stress to which the crusher is exposed during the crushing of material and an initial reference deviation value.

3. The method according to claim 1 , wherein the reference deviation value comprises the initial reference deviation value and/or a previously determined deviation value.

4. The method according to claim 1 , wherein adjusting the default setting is carried out by subtracting the deviation value from an upper limit of the quantity related to stress to which the crusher is exposed during the crushing of material.

5. The method according to claim 1 , wherein comparing the determined deviation value to the reference deviation value comprises first adding a predetermined amount to the deviation value.

6. The method according to claim 1 , wherein the deviation value comprises standard deviation.

7. The method according to claim 1 , further comprising adjusting the default setting of the quantity related to stress in response to a trigger from a control system.

8. The method according to claim 1 , wherein the quantity related to stress to which the crusher is exposed during the crushing of material comprises pressure, tension, load, power, torque or vibration.

9. The method according to claim 1 , wherein the crusher is selected from a group consisting of a gyratory crusher, a cone crusher, a jaw crusher, a high press roll (HRC) crusher, a vertical shaft impactor (VSI) crusher and a horizontal shaft impactor (HSI) crusher.

10. A mineral material processing plant comprising:

a crusher; and

a control system configured to control the mineral material processing plant according to the method of claim 1 .

11. A mineral material processing plant according to claim 10 , wherein the crusher is selected from a group consisting of a gyratory crusher, a cone, a jaw crusher, a high press roll (HRC) crusher, a vertical shaft impactor (VSI) crusher and a horizontal shaft impactor (HSI) crusher.

12. A mineral material processing plant according to claim 10 , wherein the mineral material processing plant comprises a mobile plant.

13. A control system for controlling the operation of a crusher, wherein said control system is configured to control the system according to the method of claim 1 .

14. A computer program fixed in a non-transient medium of expression comprising computer-executable program code, wherein when executed, the program code causes a computer to execute a method according to claim 1 .