When talking about coal crusher, many manufacturers may think of using jaw crusher, but the extrusion principle of jaw crusher does not apply to the making of coal. Its efficiency is often slow and power consumption is often huge and can not effectively use its own hardness properties of materials to carry out self-smash. On the contrary, subject to the constraints of physical stress, it will cause jaw plate working a long period of production and post-state of fatigue and can easily lead to broken phenomenon. In terms of breaking open or closed-circuit crushing, Liming has proved through the screening device sieve that fractions of material can reach recovery criteria. Sometimes when the particles in the open class with lower requirement, it can be sold directly. Of course, under closed-circuit condition, the effective material through the sieve can be 70% -75%. So you can make significant savings in the cost of the stability of closed-circuit system for it has been strengthened to handle more material. The integrated material progress can also upgrade 20%. The of PF Series Impact Crusher has a special processing technics. When the hammer worn and do not meet standards to combat adverse balance of forces, the sensor will record the magnitude of harmful torque, and after compared with expert system database, it will take out the corresponding amount of bearing clearance adjustment in order to be adjusted. The PF Series Impact Crusher plays an important role in this area with its high performance.