CN-121974117-A - Belt tearing detection early warning method based on stripe mark

Abstract

The invention relates to the technical field of belt conveying equipment, in particular to a belt tearing detection early warning method based on stripe marks, which comprises the steps of carrying out a test experiment on the stripe mark belt, adjusting the roller spacing of a conveyor belt based on the area ratio of the belt area of the stripe mark belt, calibrating the preset width of an oblique stripe mark area according to the heat radiation performance ratio and correcting the gap uniformity of the oblique stripe mark area according to the thermal expansion amount, setting an actual oblique stripe mark belt according to the adjusted roller spacing, the calibrated preset width and the corrected gap uniformity, and judging whether the belt is torn or not according to the stripe width variation coefficient of the oblique stripe mark area. According to the invention, the multi-working-condition simulation test is carried out on the stripe-marked belt to obtain the optimal roller spacing, stripe width and stripe gap uniformity of the belt, so that the problems that laser projection cannot sense the deformation precursor of the belt and tear early warning is difficult to realize in the prior art are solved.

Inventors

• MENG XIANGWU
• Wu Tianshuang

Assignees

• 北京中盛博方智能技术有限公司

Dates

Publication Date

20260505

Application Date

20260407

Claims (10)

1. 1. The belt tearing detection early warning method based on the stripe mark is characterized by comprising the following steps of: the method comprises the steps that a slant stripe output stripe marking belt with a preset width is arranged on the surface of a belt to be detected at equal intervals along the length direction of the belt to be detected, and tearing detection pre-testing is carried out on the stripe marking belt; The area of the oblique stripe mark area formed by all the oblique stripes is equal to that of the belt blank area; respectively acquiring the surface image of the stripe mark belt, the belt running temperature and the vibration frequency of a conveyor belt rotating wheel; Determining the area of the oblique stripe mark area and the area of the belt blank area according to the surface image analysis so as to obtain the area ratio of the belt area; Determining a roller spacing of the conveyor belt based on the belt area ratio; Determining the heat radiation performance ratio of the stripe mark belt according to the belt running temperature; Calibrating the preset width of the oblique stripe mark region according to the heat radiation performance ratio; Calculating the thermal expansion amount of the belt based on the vibration frequency and the heat radiation performance ratio, and correcting the gap uniformity of the oblique stripe mark region according to the thermal expansion amount; outputting an actual slant stripe marking belt according to the calibrated preset width and the corrected gap uniformity; Acquiring a surface image of the actual oblique stripe marking belt when actual tearing detection is carried out according to the roller spacing, and extracting an oblique stripe marking area; and acquiring the variation coefficient of the stripe width of the oblique stripe marking area, and judging whether to send out early warning aiming at the tearing risk of the actual oblique stripe marking belt according to the variation coefficient of the stripe width of the oblique stripe marking area.
2. 2. The belt tearing detection and early warning method based on the stripe mark according to claim 1, wherein the area ratio of the belt area is a ratio of an area of the oblique stripe mark area to an area of a belt blank area; The heat radiation performance ratio is the ratio of the temperature of the strip marking belt in a test experiment to the running temperature of the belt to be detected; the thermal expansion amount is the product of the vibration frequency and the vibration frequency conversion coefficient plus the product of the heat radiation performance ratio and the thermal expansion coefficient.
3. 3. The belt tear detection warning method based on the striped marking according to claim 2, wherein the determining the roller spacing of the conveyor belt based on the belt area ratio of the striped marking belt comprises, Comparing the area ratio of the belt area with a preset threshold value of the area ratio of the belt area; And if the area ratio of the belt area is larger than or equal to a preset area ratio threshold value of the belt area, judging that the bending stress generated when the stripe structure on the surface of the stripe mark belt passes through the roller is not up to the standard, and increasing the roller distance of the conveyor belt according to the difference value between the area ratio of the belt area and the preset area ratio threshold value of the belt area.
4. 4. The streak marker based belt tear detection warning method as in claim 3 wherein the magnitude of the increase in roller spacing is positively correlated to the difference between the belt area ratio and the predetermined belt area ratio threshold.
5. 5. The belt tear detection and early warning method based on a stripe mark according to claim 4, wherein the calibrating the preset width of the diagonal stripe mark region according to the heat radiation performance ratio comprises, Comparing the heat radiation performance ratio with a preset heat radiation performance ratio threshold; And if the heat radiation performance ratio is smaller than or equal to a preset heat radiation performance ratio threshold, determining that the heat radiation of the oblique stripe mark area of the stripe mark belt does not reach the standard, and reducing the preset width of the oblique stripe mark area according to the difference value of the preset heat radiation performance ratio threshold and the heat radiation performance ratio.
6. 6. The belt tear detection and early warning method based on a stripe mark according to claim 5, wherein the magnitude of the decrease in the preset width of the diagonal stripe mark region is positively correlated to the difference between the preset heat dissipation performance ratio threshold and the heat dissipation performance ratio.
7. 7. The belt tear detection and warning method based on a striation mark according to claim 6, characterized in that correcting the gap uniformity of the diagonal striation mark according to the thermal expansion amount comprises, Comparing the thermal expansion amount with a preset thermal expansion amount threshold; If the thermal expansion amount is larger than or equal to a preset thermal expansion amount threshold, judging that the thermal expansion influence degree of the strip marking belt is not in accordance with the requirement, and increasing the gap uniformity of the oblique strip marking area according to the difference value between the thermal expansion amount and the preset thermal expansion amount threshold.
8. 8. The belt tear detection and warning method based on a striation mark of claim 7, wherein the magnitude of increase in gap uniformity of the diagonal striation mark is directly related to the difference between the thermal expansion and the predetermined thermal expansion threshold.
9. 9. The belt tearing detection and early warning method based on the stripe mark according to claim 8, wherein the judging whether to send out the belt tearing risk early warning for the actual oblique stripe mark according to the stripe width variation coefficient of the oblique stripe mark region comprises comparing the stripe width variation coefficient with a preset stripe width variation coefficient threshold; If the variation coefficient of the stripe width is larger than or equal to the preset variation coefficient threshold of the stripe width, judging that the actual oblique stripe marking belt is at risk of tearing, and triggering early warning buzzing.
10. 10. The belt tearing detection early warning method based on the stripe mark according to claim 9, wherein the stripe width variation coefficient is a ratio of standard deviation to average value of measured width values of each stripe in an oblique stripe mark region when the real oblique stripe mark belt runs.

Description

Belt tearing detection early warning method based on stripe mark Technical Field The invention relates to the technical field of belt conveying equipment, in particular to a belt tearing detection and early warning method based on stripe marks. Background At present, belt tearing detection mainly depends on manual inspection, a contact sensor or direct visual identification of belt surface cracks. However, since the surface texture of the belt is single and is easily affected by oil stain, dust and illumination changes, early tearing cracks are difficult to accurately identify, and the existing method has the problems of low detection precision, high false alarm rate, difficulty in realizing real-time online detection and the like. The belt tearing detection method generally uses laser to mark along the direction perpendicular to the belt conveying direction, then adopts an optical camera to acquire and analyze whether tearing occurs or not, and uses a position sensor or a camera to detect the edge of the belt to judge the belt deviation. The laser line is projected upwards in the later stage, so that the longitudinal deformation or the transverse deformation of the belt cannot be perceived, but the laser line cannot be detected before the belt is torn after the belt is torn in the earlier stage, because the laser reflected image has almost no change, the early warning analysis on the belt tear or the position with higher tearing probability is difficult to be carried out, and only whether the belt is torn or not can be judged. Chinese patent publication No. CN101804907a discloses a machine vision belt tearing detecting and protecting device. The line laser projects a continuous laser straight line to the bottom surface of the belt, and images are acquired from both sides respectively through the CCD camera. The real-time acquired image is transmitted to a tearing detection control computer, the characteristics of the intensity, curvature and the like of the laser stripes are extracted for training of a neural network algorithm, and the tearing accident can be detected rapidly and accurately after the network is learned. In order to obtain clear and stable images in 24 hours in all weather, a part of the belt conveyor is sealed by using a sealing cover, and the LED light source is adopted for light filling. The double CCD fault-tolerant mechanism avoids noise interference caused by dust, cinder and other factors to the image, and the structured light technology reduces the complexity of image processing from two dimensions to one dimension. Disclosure of Invention Therefore, the invention provides a belt tearing detection and early warning method based on a stripe mark, which is used for solving the problems that laser projection cannot sense a belt deformation precursor and tear early warning is difficult to realize in the prior art. In order to achieve the above purpose, the invention provides a belt tearing detection and early warning method based on stripe marks, comprising the following steps: the method comprises the steps that a slant stripe output stripe marking belt with a preset width is arranged on the surface of a belt to be detected at equal intervals along the length direction of the belt to be detected, and tearing detection pre-testing is carried out on the stripe marking belt; The area of the oblique stripe mark area formed by all the oblique stripes is equal to that of the belt blank area; respectively acquiring the surface image of the stripe mark belt, the belt running temperature and the vibration frequency of a conveyor belt rotating wheel; Determining the area of the oblique stripe mark area and the area of the belt blank area according to the surface image analysis so as to obtain the area ratio of the belt area; Determining a roller spacing of the conveyor belt based on the belt area ratio; Determining the heat radiation performance ratio of the stripe mark belt according to the belt running temperature; Calibrating the preset width of the oblique stripe mark region according to the heat radiation performance ratio; Calculating the thermal expansion amount of the belt based on the vibration frequency and the heat radiation performance ratio, and correcting the gap uniformity of the oblique stripe mark region according to the thermal expansion amount; Outputting an actual slant stripe marking belt according to the calibrated preset width and the corrected gap uniformity; Acquiring a surface image of the actual oblique stripe marking belt when actual tearing detection is carried out according to the roller spacing, and extracting an oblique stripe marking area; and acquiring the variation coefficient of the stripe width of the oblique stripe marking area, and judging whether to send out early warning aiming at the tearing risk of the actual oblique stripe marking belt according to the variation coefficient of the stripe width of the oblique stripe marking area. Further, the area ratio