Roller main categories: Parallel roller common type roller, comb-type roller, forward-Roller, steel, rubber type roller, screw-type roller and the like. Spherical roller with universal type, friction reversible roller, strong type roller, tapered roller, screw-type roller, combination roller and the like. Buffer roller spring plate roller, roller cushion ring type, strong buffer type roller, roller adjustable elastic type, hanging type roller and the like. Roller Maintenance: roller normal life more than 20000h UHMWPE roller mill, generally do not need maintenance. But use the site and size of the load UHMWPE roller manufacturers, should develop appropriate maintenance date, time cleaning oiling maintenance, clean the float coal. For abnormal sounds and do not turn the roller should be replaced.