Metal Strip Shape Sensing With Band Reflection Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional strip shape determining methods for metal strips in rolling mills are prone to erroneous determinations due to slight disturbances or small obstacles, as they rely on linear or rod-shaped reflection light with a narrow reflection area, which can be significantly affected by minor disturbances.
Innovation Solution
A strip shape determining apparatus using band-shaped reflection light, where cameras capture images of the band-shaped light across the metal strip's surface, and an image processing unit divides the image into segments to calculate Chebyshev polynomial coefficients, providing a more robust determination of strip elongation by analyzing the distribution of reflection light across the strip width direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linear or rod-shaped reflection light is used for strip shape determination, then the measurement method is simple, but the determination is significantly affected by slight disturbances or small obstacles causing erroneous results
Solution Approach 1:
The patent divides the reflection light area into multiple segments in the strip width direction. Instead of using a single linear measurement, the reflection light area is segmented into multiple regions, and Chebyshev polynomial coefficients are calculated for each segment to represent the strip shape distribution. This segmentation approach reduces the impact of local disturbances or obstacles on any single measurement point, thereby improving determination reliability while maintaining reasonable system complexity.
2Device complexity
If linear or rod-shaped reflection light is used, then the measurement system is simple, but the reflection light area is narrow making it susceptible to disturbances
Solution Approach 1:
The patent transitions from using linear or rod-shaped reflection light (one-dimensional measurement) to band-shaped reflection light (two-dimensional measurement). By illuminating the strip surface with band-shaped light that extends in both the rolling direction and strip width direction, the system captures a broader area of the strip surface. This dimensional expansion provides more comprehensive shape information while reducing susceptibility to localized disturbances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the impact of disturbances and small obstacles, enabling more accurate strip shape determination by utilizing band-shaped reflection light and Chebyshev polynomial analysis, improving the reliability of strip shape assessment in rolling mills.
Implementation Method 1
band shaped reflection light that crosses a surface of the rolled metal strip in a strip width direction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a strip shape determining apparatus for a metal strip and a rolling mill, and a determination method that are less likely to be affected by slight disturbance and a small obstacle generated suddenly than in conventional ones. A strip shape determining apparatus for a rolled metal strip 1 includes: cameras 61, 62, 63 and 64 that are installed so as to capture images including areas where band shaped reflection light that crosses the rolled metal strip 1 in the strip width direction is visible; and an image processing computer 80 that determines the strip shape of the metal strip 1 on the basis of the images captured by the cameras 61, 62, 63 and 64. The image processing computer 80 divides the area in each image into a plurality of segments in the strip width direction of the metal strip 1, and on the basis of index information representing an area-related size of each segment formed by the division, transfers, as a signal, information corresponding to the distribution in the strip width direction of strip elongation in the rolling direction.