Pebble Crusher RiverStoneCrushing Plant Rock . 2020-5-16 In addition, considering that the hardness of theriver pebbleis extremely high and the crushing efficiency is relatively low, the graded crushing production line is best choice, that is, the PE500 750 jawstone crusheris used first, and then the WLC1160conerockcrusheris used for middle crushing, and then two sets of 1200