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At present, there are two types of rice color sorter in the market: optical type and CCD type; No matter which type is it, the basic working principle is: the color difference between good rice and bad(unwanted) rice. First of all, the machine should translate the photo signal to electronic signal by photo-sensor and other complex element; then due to there is difference between good materials and bad materials, so corresponding there is also a difference good materials' electronic current; And we can adjust some degree electronic current is"safe" (good materials)and other is"dagerous"(bad or unwanted materials). At last, when the electronic current is "safe", there is nothing happens and rice will successfully fall down to the accepted oputlet; but if the electronic current is "dangerous", the ejector will be driven to blow away the bad or unwanted materials.

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