Screw feeder and screw feeder design method

摘要

PROBLEM TO BE SOLVED: To provide a screw feeder capable of obtaining a good conveying ability while suppressing the generation of bridges. A screw feeder for conveying an object to be conveyed, comprising a casing and a pair of screw shafts arranged in parallel in the casing in a horizontal direction, and the pair of screw shafts are configured to rotate. By including a shaft portion configured to be possible and a screw blade spirally provided on the outer circumference of the shaft portion, by rotating the screw blade, the transported object is complemented in the gap between the pitches of the screw blades, The transport object is configured to be transported to one side in the direction in which the axis of the shaft extends, and the distance between the axes of the pair of screw shafts is L1, and the outer diameter of the screw blades of the pair of screw shafts is D. Then, the condition of 1.3≦L1/D≦1.6 is satisfied. [Selection diagram]