Flatness Measuring Roll With Decoupled Bars
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Solution Overview
Problem
Existing flatness-measuring rolls for metal strips face limitations in measuring accuracy, particularly due to varying contact areas and deformation during measurements, which affect the reliability of tension distribution detection.
Innovation Solution
The design includes axially spaced, angularly elongated measuring bars with a constant width, each equipped with at least two force-measuring sensors, allowing multiple measurements per axial position and averaging to reduce uncertainties, and decoupling from the roll surface to prevent deformation and maintain accurate contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measuring bars are decoupled from the roll surface, then measurement precision is improved by preventing deformation, but device complexity increases due to the need for precise positioning and mounting mechanisms
Solution Approach 1:
The patent introduces an intermediary gap between the measuring bars and the roll surface, allowing the bars to be braced against force-measuring sensors without direct contact to the roll. This intermediary space prevents deformation of the measuring bars while maintaining measurement accuracy, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The measuring system is segmented into separate components: measuring bars that are radially shiftable relative to the roll body, force-measuring sensors positioned between the bars and roll, and mounting mechanisms. This segmentation allows each component to be optimized independently, improving measurement precision while managing device complexity through modular design.
2Measurement precision
If multiple force-measuring sensors are used per measuring bar, then measurement precision is improved through averaging, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple force-measuring sensors are combined and braced between the same measuring bar and roll body, working together to provide redundant measurements. The averaging of readings from multiple sensors improves measurement precision while the shared mounting structure through the measuring bar manages device complexity.
3Adaptability or versatility
If measuring bars are radially shiftable relative to the roll body, then adaptability is improved for different measurement conditions, but reliability worsens due to potential instability and positioning errors
Solution Approach 1:
The measuring bars are designed to be radially shiftable relative to the roll body, transitioning from a static to a dynamic configuration. This allows the measuring bars to be positioned at different radial locations depending on measurement requirements, improving adaptability while maintaining reliability through controlled positioning mechanisms.
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
This approach significantly enhances measuring accuracy by allowing multiple 'usable' measurements per cycle and revolution, reducing errors and increasing resolution over the strip width, while maintaining stability and reliability.
Implementation Method 1
at least two respective force-measuring sensors are braced radially between each of the bars and the roll body
Implementation Method 2
exerts with respect to the local longitudinal tension distribution in the direction of the strip width local contact forces radially inward onto the flatness measurement roll
Data Source
AI summary
A flatness-measuring roll for detecting flatness defects of a metal strip extending and moving in a strip-travel direction has a roll body having a cylindrical outer surface and a central axis extending generally perpendicular to the strip-travel direction and about which the body is rotatable. A plurality of measuring bars axially spaced along the body, recessed in the body, and having outer faces flush with the body surface are each at least limitedly radially shiftable relative to the body. The bars are angularly elongated, each extend along a plane substantially perpendicular to the roll axis, and each have a constant width measured parallel to the roll axis over generally all of a respective total angular length. At least two respective force-measuring sensors are braced radially between each of the bars and the roll body.