Granular material optical color sorter

Abstract

The invention relates to a grain material optical color selector which comprises a discharge chute, an image collecting system, a blowing system as well as an information treating control system. The observing area of the image collecting system is arranged on a material moving track limited by the discharge chute; the information treating control system is respectively connected with the image collecting system and the blowing system in a signaling way used for identifying the grains with different colors according the image digital signals of the image collecting system and controlling the blowing system to carry out corresponding blowing actions. The blowing system is provided with a plurality of blowing nozzles; the blowing path of each blowing nozzle passes through the material moving track limited by the discharge chute; the crossing position of the blowing paths and the material moving track is arranged below the observing area of the image collecting system. The image collecting system preferentially selects a CCD camera of area array CCD imaging or linear array CCD imaging. The color selector has large treating amount, simple structure and accurate judgment to the grains with different colors, which can automatically remove the grains with different colors in the material and is mainly used for sorting the grain materials, such as rice, etc.

Description

technical field [0001] The invention relates to an optical color sorter for granular materials, which can automatically remove heterochromatic particles in materials, and is mainly used for sorting materials such as rice. Background technique [0002] At present, many granular materials, such as various grains such as rice, need to be classified and selected according to the surface color to remove impurities, defective particles, bad particles and other heterochromatic particles to meet the quality requirements of the material in terms of color and purity. At present, a large number of color sorting methods are manual color sorting and photoelectric color sorting machine color sorting. The disadvantages of manual color sorting are slow speed, low efficiency, unstable quality, and high cost; photoelectric color sorters usually use Si photodiodes as light sensors to receive the reflected light of granular materials during the movement of granular materials, forming According...

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Problems solved by technology

The disadvantages of manual color sorting are slow speed, low efficiency, unstable quality, and high cost; photoelectric color sorters usually use Si photodiodes as light sensors to receive the reflected light of granular materials during the movement of granular materials, forming According to the electrical signal corresponding to the light intensity, the color of the granular material is judged according to the strength of the electrical signal, and then the air blowing device is controlled by the control system to blow out the airflow in the flow path of the granular material to blow off the unnecessary particles of different colors. Compared with manual color sorting, this kind of color sorter has made great progress in efficiency and reliability

However, this kind of color sorter needs to set grooves equivalent to the size of the particles to limit the movement trajectory of the granular materials, and set up a corresponding photoelectric receiving system for each groove to obtain the information of the material particles flowing through the specific position of the groove. Light intensity information, which brings the following defects: first, because the granular material can only move along the groove, which limits the material flow on the working surface, and thus limits the processing capacity of the color sorter; second, each groove The slot corresponds to a photoelectric receiving system. The information received by this receiving system is the superposition of large-area information. At the same time, multiple particle information enters the system, so the details of each particle cannot be well distinguished, and it will also be interfered by other particles. , leading to problems such as low sensitivity and inaccurate judgment of particle color; in addition, the system structure is also relatively complicated

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