With the rapid development of China's economy and the continuous improvement of people's living standards, rice deep processing technology has emerged in China. Therefore, the scientific research and manufacturing units engaged in the grain machine industry have aimed at the rice polishing machine market, and have introduced advanced rice polishing technology from abroad to study and design various rice polishing machines.
First, polishing characteristics
Whitening is accomplished by a combination of five processes: collision, polishing pressure, tumbling, axial transport, and spray water. However, polishing does not remove the entire layer of tantalum, but rather fines the fine tantalum powder and the raised starch fine particles on the rough surface. Compared with the working mode, polishing and whitening have the following differences: the polishing pressure is low; the density of the polished rice liquid is small; the speed of the rice grains leaving the iron roll during polishing is faster; the polishing area per unit yield is large.
Second, the rice production process
At present, the commonly used rice making process is grinding, whitening, rubbing, whitening, and spraying. Firstly, it is ground and roughened by grinding, and the brown rice is separated by the cutting and grinding of the sanding blade. Then use the rubbing and whitening to remove the remaining enamel layer and enamel powder to improve the surface finish and color of the rice granules. After wiping off the whitened rice, there is still a small part of the enamel powder left in the surface depression and there is a certain roughness, and then polished by spraying water to thoroughly remove the glutinous powder, at the same time, in the polishing pressure and associated The starch is semi-gelatinized to form a smoother surface under the action of friction temperature.
Third, polishing pressure
The polishing pressure is established by the speed and impact force of the rice grains in the polishing chamber. The factors affecting the whitening pressure are various, but the polishing pressure can be adjusted and controlled by the pressure gate at the exit of the polishing chamber. The polishing pressure is large, the collision movement is severe, and the grinding is more broken after polishing; the polishing pressure is small, the collision movement is moderated, and the grinding is less after grinding. Therefore, a small polishing pressure should be used for polishing, but the polishing pressure is too small, which may affect the process. effect. The general polishing pressure is about 400-700g/cm2.
Fourth, line speed
The line speed of the polishing roll is the main factor determining the speed and impact force of the rice grain. The line speed is low, the speed of the rice leaves off the iron roll is low, the collision movement is moderated, and the grinding is less after the polishing, but the rotation speed is too low. When the rice grain is not enough, the rice grain is partially crushed too much, resulting in over-grinding phenomenon. Reducing the rice yield will also cause the rice to be partially crushed and unevenly polished; the line speed is high, the speed and collision force of the rice grains are large, the chance of rolling the rice grains is increased, and the polishing is more uniform, but when the rice grains are over-rolled, the ends of the rice grains will be Being crushed and the broken rice increases will also lower the rice yield. Therefore, choosing a reasonable rotation speed to obtain the appropriate polishing roller line speed is very important to reduce the broken rice rate and improve the polishing brightness of rice. Generally, the polishing roller line speed should be 6-7m/s.
Five, the amount of water
During polishing, the polished indoor rice is evenly sprayed with water to make the surface of the rice moist, which is beneficial to the separation of the surface of the rice grain. At the same time, the rice table is made under the frictional temperature generated during the polishing and polishing process. The gelatinization of the starch forms a gelatinous layer, thereby achieving the purpose of improving the brightness of the rice. However, if the amount of water is too large, the rice grains will flow abnormally, causing the pressure inside the polishing machine to be too large, which will increase the crushing and even lead to â€œboring carâ€. Therefore, in the use of the polishing machine, the water quantity should be controlled first, and the water quantity control is generally At around 0.5%.
Sixth, the amount of suction
The polished air supply form has a hollow shaft spray, strong pull suction, and the spray is combined with suction. Polishing machines for axial water jets should be in the form of strong pull suction. The strong pull suction can make the water entering the hollow shaft rapidly atomize under the strong negative pressure, thereby improving the uniformity of the water. The use of strong pull suction can also increase the chance of rice grain turning, improve the polishing precision; promote the separation between rice grains and tantalum powder, which is beneficial to drainage; reduce the humidity and temperature of white rice after polishing, and play the role of cold rice. However, if the suction is the most excessive, the pressure of the polished rice will be increased, and the broken rice will be increased. Therefore, according to the specific model to choose the appropriate amount of suction, in order to effectively reduce the crushing, is conducive to the role of polishing.
Seven, rice flow
The flow rate is stable during the polishing process. If the flow rate is too small, the chance of turning the rice grains in the polishing chamber is too much, and the friction and impact force generated are too large, resulting in over-grinding phenomenon. Over-grinding will not only cause the surface of the rice grains to lose light, but also seriously affect the rice yield. If the flow rate is too large, the rice grains are not easily tumbling in the polishing chamber, so that the chances of the rice grains contacting the iron rolls and the rice sieves are too small, and the processed rice also fails to achieve the polishing effect. Therefore, in the polishing process, according to the specific processing materials, specific practice and proper control of the flow rate, the rice grains can be properly turned, impacted, crushed and rubbed in the polishing chamber to ensure that the rice processed by the polishing machine reaches the rice grains. Complete, bright surface finish.
The above is to share with you the relevant content of rice polishing machine, hope that through the above content, we can let everyone know more about rice polishing machine products.
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