Waste heat recycling device of expanded feed dryer

The utility model discloses a waste heat recycling device of an expanded feed dryer. The utility model relates to the technical field of feed production equipment. The dryer comprises a dryer body, aheat absorption sleeve is mounted in the drying machine body; a spiral pipe is mounted in the heat absorption sleeve; the middle of the spiral pipe is connected with a heat exchange box through a dedusting cylinder; an S-shaped bent pipe is mounted in the heat exchange box; a dust removal plate is installed in the dust removal cylinder, a plurality of filtering holes are formed in the dust removalplate, guide columns are installed at the upper end and the lower end of the inner wall of the dust removal cylinder at the left end of the dust removal plate, dust removal blocks are installed in the middles of the guide columns, and reciprocating lead screws are connected to the middles of the right ends of the dust removal blocks through threaded holes. According to the drying machine, heat oftail gas exhausted from th