In order to achieve the purpose, the multi-stage pulping
machine adopts the following technical scheme that the multi-stage pulping
machine comprises a rack, an upper cover, a
grinding device and a power part are installed on the rack, and a hopper is arranged on the upper cover. According to the multi-stage pulping
machine and the cleaning device thereof, soybean milk liquid obtained after third-stage
grinding and bean dregs obtained after first-stage
grinding are mixed through the second residue-liquid
mixing chamber and then fed into the second-stage grinding device, feeding liquid in the third-stage grinding device is
purified water, but the bean dregs are bean dregs obtained after three-stage grinding, so that the soybean milk liquid and the bean dregs are mixed uniformly, and the cleaning efficiency is improved. After the soybean milk with the lower concentration is mixed with the bean dregs,
grease adhered to the bean dregs after the first-stage grinding is reduced, so that the situation that the second-stage grinding effect of the bean dregs is influenced due to excessive
grease adhered to the bean dregs is avoided; meanwhile, the soybean milk subjected to third-stage grinding can be concentrated to obtain soybean milk with higher nutritional ingredients, and the grinding effect is improved.