Screw Conveyor: 1.Passed ISO9001:2008 2.Conveying powder,granular,small block materials,such as cement,grain,ash,sand,chemical Application of screw conveyor:GX series screw conveyor has passed ISO9001:2008 standard. It has been widely used in industries, such as building materials, metallurgy, chemical industry, light industry, food industry. etc, suitable for conveying powder, granular, small ...