Rolling Mill Sheet Measurement with Resonant Tilt 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 specific frequencies to detect spatial deviations by measuring shifts in resonance frequency caused by the metal sheet, allowing for accurate detection of curvature and tilt without interfering with the inspection coils.
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 mutual interference that would occur in a unified measurement approach.
Solution Approach 2:
Correction coils serve as intermediary sensors that detect spatial deviations (curvature and tilt) without directly measuring metal sheet properties. These intermediary measurements are then used to correct the primary measurements from inspection coils, indirectly eliminating the harmful effects of curvature and tilt.
2Adaptability or versatility
If additional poles and parasitic capacitance are added to the inspection coils system to detect spatial deviations, 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, rather than modifying the inspection coils. This segmentation adds minimal complexity while achieving the desired adaptability.
Solution Approach 2:
The correction coils serve multiple purposes: detecting curvature, detecting tilt, and providing correction data for both thickness and resistivity measurements. This multi-functionality achieves high adaptability without proportionally increasing device complexity.
3Ease of operation
If correction coils are placed close to inspection coils for integrated measurement, then measurement integration is improved, but coupling and crosstalk between coils increases
Solution Approach 1:
The coil system is spatially segmented into central inspection coils and peripheral correction coils. This segmentation physically separates the two functional groups, minimizing electromagnetic coupling and crosstalk while maintaining measurement integration through coordinated operation.
Solution Approach 2:
The correction coils are positioned in a different spatial dimension (peripheral region) relative to the inspection coils (central region). This dimensional separation reduces direct coupling while allowing both sets of coils to measure properties of the same metal sheet through their respective positions.
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 enhances measurement accuracy by minimizing coupling and crosstalk between coils, enabling precise detection of spatial deviations and improving the reliability of metal sheet properties measurement.
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 connected 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
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AI summary
The present invention relates to a measurement device (106) for measuring properties of a metal sheet (104) processed in a rolling mill (100), comprising: an inspection coil set comprising a transmitter coil (108) and a receiver coil (110), 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 (116, 118, 122, 124), 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.