The material conveying line consists of a variety of conveying equipments such as inlet and outlet rollers, transverse conveying, variable conveying, etc., which are combined according to the actual flow, regional layout, etc. The conveying equipments are composed of rollers, bearings, sprockets, transmission roller chains, tensioners, gear motors and gratings, etc., which are driven centrally in sections and lubricated centrally in a section by section manual (automatic) lubrication.