Sectional type screw conveyor

The utility model discloses a sectional type screw conveyor which comprises a convey shaft, wherein the convey shaft comprises an input end and an output end; at least two sections of continuous spiral vanes are arranged on the convey shaft; end parts of every two adjacent spiral vanes are welded together; screw pitches of every two adjacent spiral vanes are different; and in a material conveying direction, the screw pitches of the spiral vanes located downstream are larger than those of the spiral vanes located upstream. The sectional type screw conveyor guarantees that the conveying capacity of the spiral vane at the output end is higher than that of the spiral vane at the input end, prevents the spiral vane at the output end from being abraded too rapidly and prevents the blocking and the rice breaking from occurring at the output end; and besides, the sectional type structure is adopted, so that the processing production of the spiral vanes is facilitated.