... barite, fluorite, dolomite, garnet, carborundum, bauxite, zircon, marble, calcite, iron ore, rock phosphate, coal, ceram, slag and so on (400 ... kg pressure spring. When the machine works, the grinding roller, under the action of high pressure spring and centrifugal force ... spring to keep the constant grinding pressure between grinding roller and grinding ring, stable output and fineness are guaranteed ...