碾米机白化机制的滚动运动 rice mill 是米粒的滚动运动。倾斜是米粒长轴的旋转运动，而滚动是米粒短轴的旋转运动。在碾米的白化过程中，米粒必须具有滚动运动，以使米粒的各个部分都能均匀接受碾米的白化效果，从而避免白化不足或局部过度研磨的现象。有三种方式可以产生这种运动。
1. Rolling caused by white roller tendons (grooves) of rice mill. The direction of the velocity when the rice grain is separated from the rib (groove) is at an Angle with the tangent line, which makes the rice grain produce more collisions and rolls more times on a circumference.
2. Rolling caused by rice milling cutter, screen hole and convex point. The rice grain moves with speed. When it reaches the rice knife, the edge of the rice knife will bounce back Different “angles make the grains of rice roll. When there are many milling cutters, screen holes and convex points in the whitening room, there are many tumbling times, and vice versa. However, the number cannot increase indefinitely, which is limited by the whitening chamber structure and factors influencing the process effect.
3. 由喷射气流引起的滚动 rice mill 。喷雾碾米变得越来越普遍，白色辊内部到孔或槽表面的风在一定压力下喷出，喷射风速通常大于米粒悬浮速度。当空气进入碾米机的白化室时，体积膨胀，压力降低，形成空气混合流。