Roller main categories: material into the rubber roller, ceramic roller, nylon roller and insulating roller. Mainly trough idlers belt conveyor idlers, various parallel idlers belt conveyor roller manufacturers, all kinds of self-aligning roller group, various buffer roller group. Trough roller common type roller, forward-Roller, quick roller bearing type, hanging type roller, triplex roller, roller reversible, variable groove angle roller, roller transition, V-type roller and the like. The Rolling Lubrication economic divided into three categories, namely oil, grease and solid lubricants, including greases most widely used. Roller its restrictions and conditions of use requirements of structure, generally lubricated with grease. Mine commonly used grease has three categories: calcium-based grease, sodium grease and lithium grease.