Chemical-sludge evaporating and drying machine

The invention discloses a chemical-sludge evaporating and drying machine. The chemical-sludge evaporating and drying machine comprises a rack and a cylindrical shell, wherein the cylindrical shell is arranged on the rack; a feeding hopper is arranged at the upper part of one end of the shell, and a discharging port is arranged at the lower part of the other end of the shell; a main rotary shaft is arranged in the shell; a spiral blade is arranged on the main rotary shaft; the two ends of the main rotary shaft extend out of the shell and penetrate into a bearing; the main rotary shaft is a hollow shaft body; a spiral condensed-water drainage groove is arranged on the inner surface of the main rotary shaft; an air inlet joint is connected with the main rotary shaft end at the feeding hopper side; a large belt wheel is arranged with the main rotary shaft end at the discharging port side; the large belt wheel and a small belt wheel on a speed-reducing motor main shaft arranged at one side are matched for transmission by a belt; a movable joint is arranged at the main rotary shaft end part at the discharging port side, and is arranged in a protective cover; an inspection cover is arranged on the shell at one side of the feeding hopper; a ventilating port is arranged on the inspection cover; and a heat-insulating and heat-preserving layer is wrapped on the outer surface of the shell. The chemical-sludge evaporating and drying machine disclosed by the invention has the advantages that the evaporating and drying efficiency is greatly improved, and the structure is simple, so that the chemical-sludge evaporating and drying machine is suitable for being promoted and applied.