Rolling Mill Sheet Measurement with Resonant Tilt and Curvature Correction
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Solution Overview
Problem
Conventional pulsed eddy current measurement technologies in rolling mills face inaccuracies due to metal sheet curvature and tilt, which affect thickness and resistivity measurements.
Innovation Solution
A measurement device comprising an inspection coil set and a correction coil set, where the correction coils resonate at a specific frequency, allowing detection of spatial deviations by measuring shifts in resonance frequency caused by the metal sheet, thereby improving measurement accuracy without adding poles or parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pulsed eddy current measurement technology is used, then measurement of metal sheet properties can be performed, but measurement accuracy deteriorates due to metal sheet curvature and tilt
Solution Approach 1:
The measurement system is divided into separate functional components: inspection coils for property measurement and correction coils for spatial deviation detection. This segmentation allows independent optimization of each function and eliminates interference between measurement processes.
Solution Approach 2:
Correction coils serve as intermediary elements that detect spatial deviations (curvature and tilt) and provide correction data. These intermediary measurements enable compensation for geometric effects without directly interfering with the primary property measurements.
2Adaptability or versatility
If additional poles or parasitic capacitance are added to the inspection coil system, then spatial deviation detection capability is improved, but device complexity increases
Solution Approach 1:
The system separates spatial deviation detection from property measurement by using dedicated correction coils positioned at the periphery. This segmentation avoids the need to modify the inspection coil structure with additional poles or capacitance elements.
Solution Approach 2:
The spatial deviation detection function is extracted from the inspection coil system and implemented as a separate correction coil system. This extraction eliminates the need to add complex elements to the inspection coils while maintaining the ability to detect and correct for curvature and tilt.
3Measurement precision
If correction coils are placed close to inspection coils, then spatial deviation detection is improved, but interference between coil systems increases
Solution Approach 1:
The measurement device is segmented into a central inspection coil region and peripheral correction coil regions. This spatial segmentation allows correction coils to be positioned close enough for accurate measurement while maintaining sufficient separation to minimize electromagnetic interference.
Solution Approach 2:
Correction coils are positioned in the peripheral region of the support, utilizing the spatial dimension around the inspection coils rather than placing them in direct proximity. This dimensional arrangement optimizes both detection precision and interference minimization.
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 enables precise detection of metal sheet curvature and tilt, enhancing the accuracy of thickness and resistivity measurements while minimizing interference with the inspection coils, leading to improved product quality in rolling mills.
Implementation Method 1
the transmitter coil being configured to apply a time-varying magnetic field to the metal sheet, and the receiver coil being configured to detect a magnetic field transient produced from the metal sheet in response to the applied time-varying magnetic field
Implementation Method 2
each correction coil being connectable to a capacitor to form a respective resonance circuit having a resonance frequency, wherein the correction coils are configured to be resonated at the respective resonance frequency, wherein a shift in the resonance frequency in the presence of the metal sheet is detectable
Data Source
AI summary
A measurement device for measuring properties of a metal sheet processed in a rolling mill, including: an inspection coil set including a transmitter coil and a receiver coil, the transmitter coil being configured to apply a time-varying magnetic field to the metal sheet, and the receiver coil being configured to detect a magnetic field transient produced from the metal sheet. The property of the metal sheet is derivable from the magnetic field transient. A correction coil set, for detecting a spatial deviation of the metal sheet from a reference plane, each correction coil being connectable to a capacitor to form a respective resonance circuit having a resonance frequency. The correction coils are resonated at the respective resonance frequency. A shift in the resonance frequency in the presence of the metal sheet is detectable and the spatial deviation is derivable from the shifts.