The en masse conveyor is a kind of conveying equipment for continuous conveyance of bulk materials by means of moving scraper chain within the hermetic enclosure with rectangular section. It is featured with simple structure, light weight, small volume, good sealing performance and convenient installation and maintenance. It has flexible process layout, which can realize multi-point charging and discharge and realize constant quantity conveyance. Because the housing is hermetic, it has outstanding advantage in the aspect of improving workers’ operating conditions and preventing environmental pollution etc. At present, en masse conveyor has been widely used in the sectors as of electric power, metallurgy, traffic, building materials, chemical engineering, grains, cement etc.