Double-cone vacuum drying machine and method for drying SPS by means of same

The invention discloses a double-cone vacuum drying machine. The double-cone vacuum drying machine comprises a supporting column, a rotating shaft and a rotating barrel; the rotating barrel comprisesan outer barrel and an inner barrel; a flow guiding cavity is formed between the inner wall and the outer wall of the rotating barrel; a drying cavity is formed inside the inner barrel; a steam pipe communicating with the flow guiding cavity is arranged on the rotating barrel; a feeding opening communicating with the drying cavity is formed in one end of the rotating barrel; a discharging openingcommunicating with the drying cavity is formed in the other end of the rotating barrel; multiple wall knives are evenly laid on the inner wall of the drying cavity; and a first crushing rod directly facing the feeding opening and a second crushing rod directly facing the discharging opening are further arranged inside the drying cavity. By the aid of the double-cone vacuum drying machine, caking of raw materials can be pre