Spiral classifier is with the help of solid particle size is different, the proportion is different, and therefore the principle of different settling velocity in the liquid, fine ore floating in the water into the overflow, coarse ore particles sink in the bottom of the tank. By the screw to the upper discharge, to carry out mechanical classification of a classification equipment, can put the mill grinding out of the material powder level in the filter, and then the coarse material using the spiral sheet rotating blade screwing into the mill feed inlet, the filter out of the fine material from the overflow pipe. The base of the machine is made of channel steel, and the machine body is made of steel plate welded together. Screw shaft into the head, shaft head, using cast iron, wear-resistant and durable, lifting device points electric and manual two kinds.