Vertical grinding mill

During operation, the main motor drives the grinding table to rotate via a reducer, while stationary grinding rollers rotate along the raceway of the grinding table. Raw material enters through the feed chute and falls onto the center of the grinding table; under the influence of centrifugal force, it moves uniformly outward from the center toward the edge. As the material passes beneath the grinding rollers, it is subjected to crushing and pulverization—the necessary grinding force being supplied by a hydraulic loading system. Large lumps of material are directly crushed, while finer particles are compressed to form a material bed, facilitating inter-particle grinding.

ODrying and grinding occur simultaneously: primary hot air enters uniformly around the grinding table through an air ring. This airflow dries the pulverized material—which has been tangentially flung outward from the grinding table following pulverization—and conveys it upward to the classifier. Within the classifier, under the action of the rotor blades, coarse particles are returned to the grinding table for further processing. Fine particles of the required fineness exit the mill along with the airflow and are collected by the system's dust collector as the finished product. Meanwhile, a small fraction of larger, difficult-to-grind particles and impurities—which are too heavy to be lifted by the primary airflow—fall through the air ring into the primary air chamber located beneath the mill; these are then discharged from the machine by a scraper device or are conveyed back to the feed inlet to re-enter the vertical mill for further grinding.