In view of the low grade of limestone in the company's mines, high silicon content, strong toughness and not easy to be broken; low output of the crusher, serious wear of the hammer head and hammer disc; large motor startup vibration and high current when the motor is directly started, it was upgraded. By adopting changes in PCY- S2020B type crusher rotor drive form, optimization of the number and size of hammer heads, improvement of rotor structure and other measures have increased the output of the crusher, it ensured the safe and stable operation of the crusher equipment and the smooth progress of production, while reducing energy consumption and saving The production cost has been reduced, and considerable economic benefits have been achieved.