Coil Diameter Calculation for Steel Plate Coating Thickness Measurement
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Solution Overview
Problem
Current methods for measuring the thickness of oxide isolating agent coatings on steel strips in silicon steel manufacturing are either inaccurate and costly or lack real-time capability, with on-line measurements being prone to errors due to contamination and environmental factors, and off-line methods being labor-intensive and non-timely.
Innovation Solution
A method and system that measures the coating thickness by calculating it using the outer and inner diameters of a coiled steel strip with a coating, along with the strip length and thickness, using devices like X-ray gauges and laser rangefinders, allowing for real-time, accurate, and cost-effective online measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If on-line measurement using β-ray reflection intensity difference is used, then real-time measurement capability is achieved, but measurement accuracy and stability deteriorate due to probe contamination and environmental dust
Solution Approach 1:
The patent introduces an intermediary calculation approach: instead of directly measuring coating thickness through contaminated probes, it measures the outer diameter of the coiled steel strip (which includes coating) and calculates the coating thickness indirectly through geometric relationships. This intermediary measurement method avoids direct contact with the coating, eliminating probe contamination issues while maintaining real-time measurement capability.
2Loss of time
If on-line measurement using β-ray reflection is used, then real-time measurement is achieved, but measurement stability worsens due to frequent maintenance and calibration requirements
Solution Approach 1:
The patent uses the outer diameter of the coiled strip as an intermediary parameter that is easier to measure stably than direct coating thickness. The coil outer diameter can be measured continuously during coiling without requiring probe maintenance, as the measurement is taken from the coil structure itself rather than through a contaminated probe interface.
Solution Approach 2:
The patent replaces the mechanical/probe-based β-ray reflection measurement system with a geometric calculation system based on coil dimensions. This substitution eliminates the need for physical probes that require maintenance and calibration, thereby improving measurement stability and reliability.
3Measurement precision
If off-line measurement by manual sampling and weighing is used, then measurement accuracy is improved, but labor cost and management cost increase significantly
Solution Approach 1:
The patent replaces the manual mechanical operations of sampling, scraping, and weighing with an automated geometric calculation system. By measuring coil outer diameter and using mathematical relationships, the system eliminates complex manual procedures while maintaining measurement accuracy, thereby reducing operational complexity and labor requirements.
4Measurement precision
If off-line measurement method is used, then measurement accuracy is improved, but timeliness deteriorates making quick adjustment difficult
Solution Approach 1:
The patent performs measurements during the coiling process itself rather than after the coating is applied and dried. By measuring the coil outer diameter as the strip is being coiled, the system obtains measurement results in real-time, enabling immediate feedback and quick adjustment of coating parameters before production continues.
Data Source
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AI summary
Disclosed is a method for measuring the coating thickness of steel plate, comprising the following steps: measuring the outer diameter R and the inner diameter R0 of the coil with coating, and obtaining the coating thickness Tcoating based on Tcoating=π4R2−R02/L−Tstrip; wherein the outer diameter R, the inner diameter R0, the strip length L, the strip thickness Tstrip, and the coating thickness Tcoating are in the same unit. Also disclosed is a measuring system used in the method for measuring the coating thickness of steel plate, comprising steel strip thickness measuring device for measuring the thickness Tstrip of the strip prior to coating application, which is disposed upstream of the coating device along the running direction of the strip; strip length measuring device for measuring the length L of the strip that forms coil; coil size measuring device for measuring the outer diameter and the inner diameter R0 of a coil; controlling device, which is respectively connected to the strip thickness measuring device, the strip length measuring device and the coil size measuring device, to receive the data transmitted by above measuring device, and calculate and output the coating thickness Tcoating.