The material is made to conduct a compound motion in the conebecause of the rotation and revolution of the screws. The motionsinclude:
1. The revolution of the screw along the wall makes the materialconduct a circumferential motion;
2. The rotation of the screw makes the material rise along thescrew from the cone bottom;
3. The compound motion of the rotation and revolution of the screwsmake partial material be absorbed into the screw cylindroid;meanwhile, under the action of centrifugal force, the partialmaterial in the screw cylindroid discharges radially.
4. The rising material drops under its sole weight. The four kindsof motions effect convection, shearing, and diffusion in the cone,thus quick and even mixing can be achieved.