Adjusting Blade Gap in Processing Equipment for Processing Fibrous Material

A loading device for adjusting a size of a blade gap in processing equipment for processing fibrous material, the loading device comprising:

• a gearing to be coupled in connection with at least one processing element of the processing equipment to move the at least one processing element in respect of at least one another processing element of the processing equipment for adjusting the size of the blade gap between the processing elements;
• a cage induction motor comprising a shaft coupled to the gearing for operating the gearing to move the at least one processing element with respect to the at least one another processing element;
• a position sensor for measuring a rotational position of the shaft of the cage induction motor for indicating a position of the at least one processing element in respect of the at least one another processing element;
• and
• a frequency converter coupled to the position sensor and to the cage induction motor for controlling the operation of the cage induction motor based at least on the measured rotational position of the shaft of the cage induction motor.

A method for adjusting a size of a blade gap in processing equipment for processing fibrous material, in which method at least one processing element of the processing equipment is moved in respect of at least one another processing element of the processing equipment by at least one loading device for adjusting the size of the blade gap between the processing elements, the loading device comprising:

• a gearing coupled in connection with at least one processing element of the processing equipment to move the at least one processing element in respect of at least one another processing element of the processing equipment for adjusting the size of the blade gap between the processing elements;
• a cage induction motor comprising a shaft coupled to the gearing for operating the gearing to move the at least one processing element with respect to the at least one another processing element;
• a position sensor for measuring a rotational position of the shaft of the cage induction motor for indicating a position of the at least one processing element in respect of the at least one another processing element;
• and
• a frequency converter coupled to the position sensor and to the cage induction motor for controlling the operation of the cage induction motor based at least on the measured rotational position of the shaft of the cage induction motor;
• the method comprising the steps of:
• measuring a rotational position of the shaft of the cage induction motor for indicating a position of the at least one processing element in respect of the at least one another processing element;
• determining a position control signal for controlling the operation of the cage induction motor based at least on the measured rotational position of the shaft of the cage induction motor;
• and
• controlling the operation of the cage induction motor by the frequency converter according to the determined position control signal to control the position of the at least one processing element in respect of the at least one another processing element for adjusting the size of the blade gap between the processing elements.