Product introduction: The long sand roller grinds wheat, so that the surface energy of the barley is more uniform and the damage rate is low. It adopts a horizontal double-roller structure. The air volume maintains a dynamic balance for a long time, and improves the uniformity of treatment and bran discharge between the two chambers. The external fan is used for medium-pressure air blowing, and the two ends of the main shaft and the feed port are supplemented with air, which can reduce the wheat temperature, reduce the broken wheat and bran content. The selling port adopts the dripping board classification and the secondary separation device of wheat bran, which has the function of cooling the wheat and purifying the finished wheat.