Variable-diameter variable-pitch spiral vertical planetary mixer

The invention discloses a variable-diameter variable-pitch spiral vertical planetary mixer. The mixer comprises a central screw rod doing fixed-axis rotation, a plurality of planetary screw rods doing planetary motion, a movable scraping plate doing fixed-axis rotation, a planetary gear device and a driving device, wherein a central blade is arranged on the central screw rod, planetary blades are arranged on the planetary screw rods, and the center blade and the planetary blades are variable-diameter and variable-pitch spirals. The mixer is a vertical mixing device which integrates the principles of spiral conveying, planetary motion, gravity and the like, and under the action of the central screw rod, the planetary screw rods, the self-weight and the movable scraping plate, a mixture forms large motion cycles from bottom to top and then from top to bottom while the mixture in the material field also forms a plurality of small motion cycles. According to the mixer, inefficient mixing zones can be effectively