The principle of the double-shaft crusher is driven by an electric motor or a hydraulic motor. The cutting tools are made of special alloy steel. They are controlled by a programmable logic controller. It can automatically reverse when encountering hard objects. The discharge size can be designed according to user requirements. The speed of the cutter shaft is generally 10-70 revolutions per minute. The high speed of the motor is reduced to the low speed of the cutter shaft through the reducer, so the low speed double shaft crusher has the characteristics of high torque, energy saving, low noise and low dust.