Reducing the rate of broken rice and increasing the rate of whole rice have become a way to improve the comprehensive economic benefits of enterprises. The higher the temperature of the rice mill is, the more broken rice is produced. This is a common phenomenon in rice factories. In the process of rice milling, the sand roller grinds the surface of the rice grain to remove the crust layer and the rice grains in the whitening chamber are subjected to friction and collision, which will generate a large amount of heat, so that the surface temperature of the rice grain is increased.
Due to the poor thermal conductivity of the rice grains and the slower inward transfer of the surface temperature of the rice grains, a temperature gradient (temperature difference) is formed from the outside to the inside. A large temperature difference causes thermal stress to be generated inside the rice grains, and the thermal stress exceeds the inherent strength of the rice grains. The rice ruptures or bursts. The structure of the traditional rice machine determines that the rice machine has a large ventilation resistance, and the air volume passing through is small, and it is difficult to suppress the rice temperature from rising during the rice milling process to produce broken rice. Achieving low-temperature rice milling and inhibiting the rise of rice temperature is an effective method to reduce cockroaches.
通过增加渗入抛光室的空气量，可以实现低温升高并提高碾米率。低温升米是利用喷入抛光室的风穿过米粒层，将研磨产生的热量带走，以抑制米温的升高。因此，低温升米机的关键技术是增加米机自带风机的风压和风量，减少喷入抛光室前部的风阻，并增加每单位产量的抛光移动区域的通风量。