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White rice may be mixed with heterochromatic grains, such as yellow grain rice, diseased rice, or may also be mixed with rice grains of the same size of foreign bodies. In order to produce high-quality finished rice, it is necessary to carry out color selection through the color separator, remove these heterochromatic grains, improve the purity of rice, improve the quality of rice and commodity value, and the position of the color separator process should be after polishing and grading. The polished white rice surface is smooth and contains less bran powder. When white rice contains more bran powder, it is easy to agglomerate on the channel, causing rice grains to jump in the channel. In addition, the accumulation of bran powder in the channel will affect the accuracy of the color selection. Quite a part of the heterochromatic grain (mildew grain, immature grain) structure strength is low, after milling rice has become broken, white rice classification has been a part of the heterochromatic grain removed, after white rice classification only on the whole grain beige selection, is conducive to improve the accuracy of color selection.
The color separator uses advanced photoelectric technology to detect the heterochromatic particles, and uses the driven jet system to blow the heterochromatic particles. It has the advantages of high automation, good sensitivity, reliability and stability, so it is widely used in rice processing enterprises. Color selection machine according to its performance is divided into heterochromatic particle selection, glass selection, silty particle selection. Part of the processing enterprises to the first color selection to the second color selection, the first color selection can be selected abdominal white grains, heart white grains, glutinous rice grains and minerals, etc., the second color selection can be selected heterochromatic grains, damaged grains, diseased grains impurities. In the case of conditions permit, the configuration of the color selector equipment will try to match the number of a little more, so that it can deal with the yellow, white more raw grain, and can also configure the check process, to ensure that the foot contains good rice does not exceed the standard.
During operation, the focus is on the reasonable adjustment of flow rate and sensitivity (sensitivity). When the flow rate is certain, the higher the sensitivity is, the higher the color selection accuracy is, but the lower the ratio (the mass ratio of heterochromatic particles and normal particles in the waste material); On the contrary, the lower the induction, the greater the ratio, but the color selection accuracy is reduced, so the reasonable configuration is very important, it directly affects the effect of separation. The level of induction, the working degree of the jet valve of the color selection machine, generally set between 85 and 95, the highest can not exceed 97, otherwise it is easy to burn the safety device, so that the color selection machine stops working. Color selector operation, at the beginning of the flow and induction as far as possible to enlarge, and then slowly reduce, until reaching a stable state. The flow rate and induction value of each processing should be recorded in detail, at the same time, develop visual habits, improve visual inspection level, a long time will be on different varieties, different quality of raw materials to achieve a clear mind. In this way, we can estimate the content of different color grains in raw materials by experience, so as to reasonably adjust the flow rate and induction degree of the first and second color selection machine.
Source: Online/GFMM
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