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.

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.

The basis on structure characteristics of the upright impingement crusher,analyzed a certain method of the model basic parameter,such as the rotator line speed,rate of production and the electric motor power etc.

The high chrome cast-iron added a variety of drib and microscale elements was used to make the flat hammer in overpressure turbine crusher,which can improve the wearing resistance and synthesize mechanical property of the products greatly,and the life of the products is 4 times longer than the former high-manganese steel.