Parameters of Coal Mine Belt Conveyor The coal mine belt conveyor are mainly composed of main shaft, big lane and trough conveyors, all of which are used to lift materialfrom underground to ground. Because of its limited operating environment, the conveyor requires higher standards in design, manufacturing and installation. NHI has obtained the MA certification issued by the State Administration of Coal Mine Saefty. Northern Heavy Industries Group Co.,Ltd(China NHI),listed among Top 500 Chinese Enterprises,The major products include tunnel boring equipments, Apron Feeder, Stacker Reclaimer, Conveying Equipment, China Conveyors, Conveyor System of China, Conveyor manufacturer, metallurgy equipments, mining equipments, coal machineries, power equipments,etc.With all the four qualifications recognized by ISO9001 Quality Management System. Joice