With the gradual improvement of living standards, people have put forward higher requirements for the quality of rice, which has led to the rapid improvement of rice milling techniques. With the continuous improvement of rice varieties, the output of long-grain rice has been increasing in recent years. During the harvesting and threshing process of this type of rice, due to its own reasons, a large number of broken grains will occur. Traditional rice mills, due to their backward technology, will increase the rate of broken rice. The unreasonable layout of components and the backward technology of traditional rice mills have led to insufficient air volume and low air pressure passing through the rice milling chamber. Under the effect of their own weight, the grains settle at the bottom of the rice milling chamber, with poor fluidity. The existing movement area of rice milling cannot be fully utilized. To enhance the processing quality of rice, it is necessary to use one or two machines for rice milling to increase the pressure inside the milling chamber. However, this will cause the temperature of the rice to rise. Coupled with the high cracking rate of the original rice grains, a large amount of broken rice will be produced during the rice milling process. Therefore, in order to reduce the rate of broken rice and improve the quality of rice, a multi-machine light milling process should be adopted.

Due to the differences in structure and parameters of rice mills, each rice mill has a main rice milling method. Thus, rice mills can be classified into friction type rice mills (iron roller rice mills) and grinding type rice mills (sand roller rice mills).

There are mainly three types of small-scale rice milling machines in China: namely, the separated rice mill, the combined husking and milling machine, and the air-blowing rice mill.

Operation method

Place the rice mill steadily on the workbench and plug in the power plug.

2. Determine the whitening time and adjust the timing knob of the rice mill properly.

3. Remove the pressure from the hopper, take 17-20g of brown rice (with a moisture content not exceeding 15% being appropriate) and put it into the feeding hopper. Let it flow into the whitening room. First, press the power button to start it, and then release the pressure.

At the specified time, the rice mill will automatically stop. First, take out the hopper and remove the bran. Plug in the receiving hopper again, then remove the press. Turn the front handle to the right by ° to make the polished rice in the whitening chamber fall into the receiving hopper. Set the timing knob to the 0 position, press the power button to let the grinding wheel idle for several seconds to make all the rice grains in the whitening chamber fall off. Then pull out the receiving hopper and pass it through the rice mill for screening to obtain the measured polished rice.

Precautions

Before the brown rice enters the discharge hopper of the rice mill, it is necessary to check for any metal objects or stones to avoid damaging the grinding wheel.

After the whitening process is completed, the front rotating block should be pulled out to clean up the remaining rice sugar in the whitening chamber of the rice mill to avoid affecting the accuracy of the sample.

3. The milling accuracy should be determined by the variety of brown rice, including the number of samples and the milling time. For low-precision samples, a quantity of 17-18g is appropriate, and the milling time should be slightly shorter. The quantity of high-precision samples is preferably 20g, and the whitening time should be slightly longer.

4. When the rice mill has been in use for a long time and has milled brown rice with excessive moisture, and the rice bran adheres to the grinding wheel, affecting the whiteness, you can remove the grinding wheel with a wrench, brush off the bran powder with a wire brush, and reinstall it in its original state for continued use.