The most important parameters affecting the rate of leaving embryos are the whitening gap, the structure of the roller, and the temperature rise of the grind roller. Therefore, the design of the small germ rice mill is mainly focused on reducing the temperature rise of the rice grains during the whitening process and controlling the whitening pressure. To design.
Ordinary friction type rice mill is a kind of pressure whitening, which achieves the purpose of removing the epidermis by applying a large rubbing action on the rice grains. The broken rice rate is high. At the same time, due to the large grinding pressure, the collision movement is violent, resulting in the rice grain being whitened. The interior is constantly tumbling, so that both ends of the grain are overgrown and the rice germ is easily crushed.
The roller in the whitening mechanism of the germ rice grinding machine adopts a hollow iron roller, and the roller is hollow, and is made of thick-walled seamless steel pipe. A shallow groove is opened on the surface of the roller and a spiral steel bar is installed, and the processed steel bar is subjected to heat treatment. , Surface wear, long service life. According to the principle of grinding, the grinding roller acts on the surface of brown rice through the spiral milling edge of the roller surface to achieve the purpose of removing the brown rice skin, and can achieve the purpose of uniform white rolling of rice on the entire length of the roller; in addition, the grinding rice mill The pressure in the room is small, so the impact and roll are gentle, which is good for retaining the germ, and the effect of drainage is better. Through air blowing from the air supply mechanism, the air from the roll head enters the wind, and the shallow trough wind can reduce the temperature rise of rice grains in the whitening process. For rice with high water content, it can accelerate the evaporation of water and help maintain good rice grains. Cross-section hardness and less broken rice, while reducing the temperature of the whitening chamber, rice bran difficult to paste sieve; spray can enhance the tumbling movement of rice, is conducive to improve the uniformity of whitening, to prevent excessive grinding of rice, reduce the broken rice rate, It is beneficial to the protection of germs.
As a germ rice machine, it is hoped that the rice grains are less likely to churn in the whitening gap, but this is not conducive to uniform whitening. With large gaps, the possibility of rice tumbling increases, and the gap is small, which restricts the tumbling of rice grains and the rice grains are easy to move in an orderly manner. Therefore, the whitening gap should not be too large. Because the gaps between the whitening gaps of the polygonal sieves are inconsistent, the gaps in the whitening gap are inconsistent. In a small location, the brown rice is excessively squeezed so that the stress exceeds the bio-yield strength of the rice. In a place where the whitening gap is large, the rice is subjected to severe collision, so that the embryo easily falls off and a large amount of broken rice is produced. , so the multi-angle screen does not apply to the germ rice machine, so the small germ rice machine uses a round screen.
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