... 1.Big feeding size, 2.few easydamage part, Principle Of Operation-crushers for gravel crushing,stone crusher, crusher, stone crusher plant:The ... big;breaking ratio is big;Outturn is large.2.The operation is stable and reliable,fixed with over-loading protective device ... .5.The axle bearing adopts with labyrinth seall,prolonging its operation life.6.Using modules lubrication ,which is easier and more ...