Looper Metal Strip Meandering Detection With a Single Distance Meter
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Solution Overview
Problem
Existing methods for controlling meandering in metal strips within loopers are hindered by the inability to install detection devices like light projectors and receivers in traveling passages, leading to restricted detection capabilities and increased costs due to the need for extensive device installations.
Innovation Solution
A meandering amount detection method that calculates the end portion position of a metal strip in the width direction using angles and distances measured by a distance meter, allowing for the detection of meandering amounts in any stage of the looper without the need for extensive device installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light projector and receiver or AWC are installed in the looper traveling passage to detect meandering, then meandering detection capability is improved, but device complexity and installation space increase significantly
Solution Approach 1:
The patent replaces optical detection devices (light projector/receiver) and complex AWC systems with a simple distance meter to measure the position of the looper car. This substitution of the detection mechanism reduces device complexity while maintaining measurement capability for meandering detection.
Solution Approach 2:
The patent extracts the essential measurement function from complex optical systems and reduces it to a simple distance measurement task. By taking out only the necessary measurement capability (distance to looper car) and eliminating unnecessary components, the system achieves simpler installation and operation.
2Measurement precision
If multiple detection devices are installed to detect meandering in all stages of the looper, then measurement coverage is improved, but installation space and cost increase
Solution Approach 1:
The distance meter installed on the looper car serves multiple functions: it detects meandering in all stages of the looper, measures the position of the looper car itself, and provides data for both detection and control functions. This multi-functionality eliminates the need for multiple separate detection devices at different locations.
Solution Approach 2:
The patent combines the detection function for all looper stages into a single distance meter mounted on the looper car. By merging multiple detection functions into one device, the system reduces installation space requirements and eliminates the need for multiple separate detection systems.
3Reliability
If a CPC device with meandering detector and steering roll is installed to control meandering, then meandering control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential control function from the complex CPC system and implements only the necessary components: a distance meter for detection and a simple steering roll mechanism for correction. By taking out and implementing only the essential elements, the system achieves effective meandering control with reduced complexity.
Solution Approach 2:
The looper car itself serves as the mounting platform for the distance meter, utilizing its own structure and movement. This self-service approach eliminates the need for separate support structures and reduces overall system complexity while maintaining detection and control capabilities.
Data Source
AI summary
A meandering amount detection method for a metal strip traveling in a state of being overlapped in a plurality of stages, includes: calculating an end portion position in a width direction of a metal strip in each stage using an angle formed by a reference direction, which is any direction determined from a reference point, and a direction connecting the reference point and an end portion position in a width direction of a metal strip in each stage, a distance between the reference point and an end portion position in a width direction of a metal strip in each stage, and a distance between a straight line including a width direction of the metal strip and the reference point; and calculating a meandering amount of a metal strip in each stage based on the calculated end portion position in the width direction of the metal strip in each stage.