Novel spiral feeding device capable of preventing dead materials

The utility model discloses a novel screw feeding device capable of preventing dead materials, which comprises a variable-pitch screw shaft and a variable-diameter screw blade, the diameter of the screw blade is gradually increased along the material transfer direction, and the pitch of the screw shaft is gradually increased along the material transfer direction. The shaft diameter of the spiral shaft is gradually increased and then gradually decreased in the material conveying direction. An existing equidistant screw is transformed into a variable-pitch screw, and the screw pitch is small in the feeding section, so that the contact face of raw materials and the screw blade is enlarged, the stirring area of the screw blade is enlarged, and a dead material area is prevented from being generated; and the spiral shaft is variable in diameter, so that stable feeding is realized. 本实用新型公开了一种新型的防止死料的螺旋给料装置，包括变螺距的螺旋轴与变径的螺旋叶片，所述螺旋叶片的直径沿物料传递方向逐渐增大，所述螺旋轴的螺距沿物料传递方向逐渐增大，所述螺旋轴的轴径沿物料传递方向先递增后递减。将现有的等距螺旋改造为变距螺旋，在入料段，螺距小，从而增大原