A method for online defect detection of fabric weaving based on line laser
A line laser and point detection technology, applied in textiles, papermaking, knitting, etc., to achieve the effects of good adaptability, timely defect judgment, and low system cost
Active Publication Date: 2020-04-28
TIANJIN UNIV
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Problems solved by technology
At present, for the problem of fast and accurate identification of warp knitting defects, no successful universal warp knitting visual inspection system is still in the exploratory stage, and there is still a considerable distance from practical online measurement
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Embodiment Construction
[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0017] The system structure of the present invention is as figure 2 As shown, the line structure laser is installed on the front end of the knitting machine. The laser line irradiates the yarn directly from the obliquely above the front end of the knitting needle machine. Another laser transmits the laser line to irradiate the knitting needles. The camera is also installed at the front end of the machine tool at a certain distance from the laser. Simultaneous acquisition of yarn and needle bright spot images.
[0018] Detection flow chart of the present invention is as figure 1 shown. On the knitting machine 6, the laser line or surface is irradiated on the yarn 5 and the knitting needle 3, and the yarn and the knitting needle interweave with the light curtain formed by the laser to form a bright spot 4, so that the yarn and the knitting needle are...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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The invention relates to a fabric weaving on-line defect detection method based on a line laser. The method includes the steps that a laser line or plane is shone onto a yarn and a needle, and light curtains formed by the yarn and the needle and the laser are interlaced to form bright spots; a camera collects the formed bright spots; threshold segmentation is conducted on each frame of image in aspecified sampling time to obtain the positions of the bright spots formed when the yarn and the needle are interlaced with the laser plane, and the center coordinates of the bright spots are extracted; the positions of the same bright spot in different images are sequenced to form a sequence, so that the motion trail of each single bright spot in the sampling time is obtained, and bright spot one-dimensional motion signal graphs are obtained; the bright spot one-dimensional motion signal graphs are transformed into two-dimensional spectrograms through wavelet transformation; deep learning isconducted through a CNN, and two-dimensional spectrograms corresponding to normal yarn motion laws and two-dimensional spectrograms corresponding to abnormal conditions are marked respectively for training and learning.
Description
technical field [0001] The invention belongs to the field of textile quality inspection and relates to an online defect detection method for fabric weaving based on a line laser. Background technique [0002] my country is the world's largest fabric producer and exporter. In actual production, defect detection is the most important. At present, fabric quality control and detection of fabric defects is very important. Fabrics are generally completed by workers' visual inspection, which has low detection speed, workers' subjective factors have a great influence on the detection results, and there are also disadvantages such as high false detection rate and missed detection rate. Mainly for export processing, the added value of textiles is low, lack of high-level production equipment for independent production, and mainly import machines from Germany and Japan. [0003] It is an important development direction of the warp knitting industry under intelligent manufacturing to ca...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): D04B35/20
Inventor 张效栋李娜娜朱琳琳
Owner TIANJIN UNIV