Unequal-diameter three-roller grinding machine

The invention belongs to the technical field of grinding machines, and provides an unequal-diameter three-roller grinding machine which comprises a rack, a feeding roller, an intermediate roller and a discharging roller, wherein the diameters of the feeding roller, the intermediate roller and the discharging roller are not completely the same or are completely different; the larger the diameters of the rollers are, the higher the linear speeds of the relative movements of the roller surfaces are; the axis connecting line between the feeding roller and the intermediate roller as well as the axis connecting line between the middle roller and the discharging roller are in a V shape; the diameter of the intermediate roller is larger than that of the feeding roller and that of the discharging roller, and the diameter of the discharging roller is larger than that of the feeding roller; and or the diameter of the intermediate roller is smaller than that of the feeding roller and that of the discharging roller, and t