SAND, GRAVEL, AND CRUSHED STONE ONTHEJOB .
brought f rom a quarry to a prim ary crusher by rear dum p haul tru cks. Som e prim ary crush ers are fed by wobblers, which are chain driven conveying systems with eccentric rollers. After primary crushi ng, mater ial is conv eyed by belt to a scr ubber for washing. The scr ubber is a cylindrical, rotary device with internal screens and auger ...