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The tumbling motion of the rice milling machine is the movement of the rice grain turning and rolling. The flipping is the rotational motion of the long axis of the rice grain, and the rolling is the rotational motion of the short axis direction of the rice grain. In the process of milling the rice mill, the rice grain must have a tumbling motion so that all parts of the rice grain can equally accept the whitening effect of the rice milling machine, so that the whitening is uniform, and the phenomenon of insufficient whitening or partial over-grinding is avoided. There are 3 ways to produce it.
1. Rolling caused by the white roller (slot) of the rice mill. When the rice grain is separated from the rib (slot), the velocity direction is at an angle to the tangent, so that the rice grain has more collisions on one circumference and more tumbling times.
2. Rolling caused by rice cutter, sieve hole and bump. The rice grain is "moved at speed". When it reaches the rice knife and other places, it bounces back at the front edge of the rice knife, etc., rebound speed, speed direction angle..., different "corner causes the rice grain to roll." When milling white rice knives, sieve holes, and bumps for a long time, the number of tumbling times is large, and vice versa; but it cannot be increased indefinitely, and is limited by the structure of the whitening chamber and the factors affecting the process effect.
3. Rolling caused by the wind blower of the rice mill. Spraying rice has become more and more popular. The wind is sprayed from the inside of the white roller to the surface of the hole or slot under a certain pressure. The jet velocity is generally higher than the suspension speed of the rice grain. When the air enters the milling chamber of the rice milling machine, the volume is enlarged, the pressure is reduced, and mixed air is formed, and the rice grains form a tumbling motion in the vortex.
Source: Online/GFMM
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