The rotation speed of the grinding machine directly determines the movement state of the grinding medium in the cylinder and the effect of the grinding operation. When the rotation speed is low, the ball in the ball mill is lifted to a small height, and the ball itself rolls down from the top of the ball load by the gravity of the ball itself, which is in a sloping state. At this time, the impact force of the ball is small, but the grinding effect is strong. The ore is mainly crushed and pulverized, and the grinding effect is not high. When the rotation speed is high, the height at which the ball is lifted is also high. After the ball rises to a certain height, it leaves the cylinder and falls along the parabolic trajectory, and is in a throwing working state. The impact point has a large impact, the ore is mainly crushed by the impact, and the grinding efficiency is the highest. When the mill speed exceeds a certain limit (high speed), the ball rotates with the cylinder without falling, and is in a centrifugal operation state. At this time, the ball has no impact and the grinding action is small to stop the grinding action.
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