feb 24, 2016 double roll crusher. mechanically, the teethed roll crusher is a very simple machine. the two rolls are carried in bearings, supported on two very heavy and rigid bed castings which are secured on the concrete foundation by a number of large anchor bolts. the bearings, in addition to being bolted to these bed castings, are prevented from spreading by,pg series double toothed roller crusher,pg series double toothed roller crusher. double roller crusher is equipped with two crushing rollers. the distance between two rollers can be adjusted according to the particle size required by the user, smooth roller crusher is suitable for fine crushing operations where the feed particle size is less than 80mm and the final size 1-10mm.