This equipment uses biserial and centripetal spherical rod mandrel which can automatically adjust. The operation resistance of the equipment is extremely small, so its energy-saving effect is Significant. A section of Cone Cylinder is added to the original cylinder, which not only enlarges the effective volume the mill, but also makes the media inside the cylinder distribute more reasonably. It is widely used for grinding materials in the mineral dressing plant of non-ferrous metals and ferrous metals, as well as the Chemical and building materials lines.