Rational selection to tolerances,fits and clearance of rotor-bearing of impact crusher is very important to avoid overheat of bearing and prolong the life of bearing.

Considering the changes of the impact energy,according to the mass balance and comminuted classification,simulation and experiment at different rotor velocities and feed rates,a logical model for impact crusher that is able to predict the crusher’s performance at steady state and contains a reasonable number of parameters has been developed.

According to the mass balance and comminuted classification,considering the changes of the impact energy,simulation and experiment at different rotor velocities and feed rates,have developed a logical model for impact crusher that is able to predict the crusher performance at steady state and contains a reasonable number of parameters.

The type, the characteristic, the range of application and the performance of super-pine crush equipment is stated, and the mechanism of action of the machine impact crush equipment, MGZ-1 high frequency vibration mill, impact airflow crush equipment, and wet and dry tower mill are emphasized, and the way of future development and prospect are analyzed.

Based on the analysis of the dynamics of impact jaw crusher, the mobile parameters and the changing rules of inertial force (inertial moment) are obtained; the determination of the balance mass and setting angle according to the minimising left inertial force is presented; a calculation formula for determining the optimizing balance mass and setting angle is also described in this paper.