Method and device for online detection of foreign fiber in cotton

Abstract

The invention provides a method and a device for online detection of foreign fiber in cotton. The device comprises a cotton opener, channels, windows, a CCD (Charge Coupled Device) camera, an illumination light source, a background plate, a nozzle array, a foreign fiber channel, a foreign fiber collecting unit, a computer, an electrical equipment cabinet, operating buttons, a frequency conversionfan and a cotton conveyance pipe. The method comprises the following steps: opening lint cotton; feeding the lint cotton into the detection area of the CCD camera through the channels; performing theillumination and CCD camera sampling in three steps, and further collecting the detection results of the three steps for identifying the foreign fiber; calculating the time for nozzles in the corresponding positions to the foreign fiber to open and close by combining the action delay time of each nozzle; controlling the corresponding nozzles to operate, so as to remove the foreign fiber; and meanwhile, outputting clean cotton with the foreign fiber being removed from the clean cotton output channel, wherein, by combining the performance parameters of the CCD camera, the cotton flow rate in the corresponding area of each nozzle can be calculated from the data obtained through infrared LED illumination and sampling, and the average cotton flow rate can be further calculated; and then, the cotton flow rate in the channels can be stabilized within a per-determined range by controlling the frequency conversion fan.

Description

Technical field: [0001] The invention relates to visible light color detection technology, ultraviolet light excitation fluorescence detection technology, infrared light absorption detection technology, signal processing technology, and speed measurement technology, especially a method and device for online detection of foreign fiber in cotton. Background technique: [0002] In the textile industry, if cotton is mixed with foreign fibers that are very similar in appearance to cotton fibers, such as plastic films, chemical fibers, hair and other impurities, it will lead to increased defects in the fabric, uneven dyeing and other defective products in the subsequent weaving process causing losses. In recent years, this has become a major public hazard in the textile industry at home and abroad. If manual sorting is used to remove foreign fibers, the effect of manual removal cannot be guaranteed because the shape, color and appearance of foreign fibers are very similar to cott...

AI Technical Summary

Problems solved by technology

However, none of the above patents mentions the speed monitoring of the inspected object, so it is difficult to guarantee the foreign fiber removal rate and noil rate indicators.

[0005] 3. Use UV-enhanced silicon photodiode to detect the ultraviolet light reflected by the foreign fiber of the same color as the cotton fiber. Due to the influence of factors such as the intensity of the ultraviolet light source and the angle of the ultraviolet light reflected back from the surface of the moving foreign fiber, etc. , therefore, the detection effect on the same color foreign fiber will be difficult to be guaranteed

[0006] 4. There is always background noise in the electronic system, also known as background noise. When the strength of the useful signal is lower than the background noise in the system, it will be obliterated and cannot be detected

However, if the intensity of the supplementary light source is too strong, the proportion of useful fluorescent signal will decrease, and if it is too weak, it will not be enough to suppress the noise floor of the CCD camera

Moreover, the noise floor of the CCD camera will change over time, and it will be difficult for the fixed combination of the two lamps to adapt to this change.

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