High impact strength and biting speed  in sand making process.  In working process, two rotors revolve reversely. The materials entering the crushing space will be crushed by the hammer in the first rotor and gain a kinetic energy, and then they will be thrown to the second rotor. Because the revolving direction of second rotor is opposite to the direction of materials flying to, the speed of the second rotor biting is amount to the summation of the speed of two rotors. The materials will be output through the grid section after the revolving crush.

Advantages:

1  gaining high biting kinetic energy with low revolving speed, so the wear and tear will be lessened. 

2  this machine characters simple structure, stable work, high reduction ratio, low energy and so on. 

3.It gains much reputation for us as soon as it is offered.