Working principle of vertical roller mill

Vertical mill working principle is the electric motor through a speed reducer drives the grinding disc to rotate, while the hot air from the inlet into the vertical roller mill, material from the feed opening fall in the center of the disc, due to the centrifugal force, material from the central disc moving toward the edge of the grinding disc, through the annular groove of the disc, grinding roller compacted crushing, crushed material to moving toward the edge of the grinding disc, until it is wind ring flow away, and large particles and fall to the disc to smash. Material flow through the upper part of the separator, in the role of guide vanes, coarse material from the cone bucket onto the disc, fine powder with the air together out of the ground, be system of the dust collector to collect, collected powder is vertical roller mill of products. Material in the process of gas contact with the shell is dried, to achieve the desired product dry humidity. By adjusting the angle of the splitter blades (small vertical mill is not adjustable) and the speed of the rotor of the separator, the product can reach the desired thickness.
Crushing principle of vertical roller mill is from 2 to 4 close to the grinding roller on the disc, as the speed of rotation to ground material. Basically belong to the material layer to smash. The material in the mill is mainly subjected to mill and the rolling action and crushed, also because the grinding roller and the grinding disc to rotate between speed difference, so it has shear milling. Feeding material in the center of the disc due to the centrifugal force of a rotary grinding disc, to the millstone around mobile into grinding roller between the roller and the grinding disc. The role of grinding roll in hydraulic device and a pressurizing mechanism, applying pressure to the material in the grinding roller. The material is compacted crushed after continue to move from the edge of the grinding disc, the disc edge overflow dam. While the hot air from the millstone around the ring nozzle high-speed to spray, the coarse particle material is blown back to the millstone re crushed, and suspended drying of materials. Fine powder with hot air into the upper separator separation, to achieve a certain particle diameter of qualified fine powder with the airflow from vertical grinding upper spillover and collection, the meal back to the millstone and feeding material together with the re grinding.