Measuring Device Coil Carrier Thermal Expansion Management
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Solution Overview
Problem
Measuring devices with traditional coil arrangements struggle to function reliably in harsh environments, such as high-temperature and steam-filled conditions found in rolling mills, due to thermal expansion issues that affect the accuracy and positioning of the measuring coils.
Innovation Solution
A measuring device design featuring a coil carrier positioned radially outside the measuring coil, which securely carries and positions the coil to manage thermal expansion, combined with a cooling system and heat shield to maintain precision and stability, allowing for effective detection of non-ferromagnetic materials under extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measuring coil is directly mounted in the housing without a coil carrier, then the device structure is simpler, but the measuring coil cannot maintain its position under thermal expansion in high-temperature environments
Solution Approach 1:
A coil carrier is introduced as an intermediary component between the measuring coil and the housing. The coil carrier radially surrounds the measuring coil and is fixed in the housing, providing a stable mounting structure that accommodates thermal expansion while maintaining the measuring coil's position and ensuring reliable operation in high-temperature environments.
2Temperature
If the measuring coil is fixed rigidly in the housing, then the positioning is stable, but the measuring coil cannot accommodate thermal expansion under high temperature conditions
Solution Approach 1:
The coil carrier is designed with specific mechanical properties that allow it to accommodate dimensional changes of the measuring coil due to thermal expansion. The carrier maintains the radial positioning of the measuring coil while allowing axial movement, thus preserving measurement precision across a wide temperature range from low to high temperatures.
3Reliability
If no cooling system is provided, then the device structure is simpler, but the measuring coil cannot operate reliably in high-temperature environments such as rolling mills
Solution Approach 1:
A cooling system utilizing fluid circulation is implemented to dissipate heat from the measuring coil and coil carrier. The system enables reliable operation in high-temperature environments such as rolling mills by maintaining operational temperatures within safe limits, with the fluid cooling mechanism integrated into the overall device structure.
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
Enables precise measurement of work piece cross-sections in challenging environments by maintaining the measuring coil's position and integrity, ensuring reliable operation between roll stands and under high-temperature conditions, while minimizing interference with the measurement results.
Implementation Method 1
They serve for detecting changes in cross-section of a work piece that runs axially through the measuring opening, for example, by a change in inductivity
Implementation Method 2
or, alternatively, by eddy current measurements, for example, in that two measuring coils, one for inducting the eddy currents and one for detecting the eddy currents, are installed accordingly
Implementation Method 3
Thermally caused expansion of the measuring coil, for example on the basis of a high work piece temperature or on the basis of a high ambient temperature, then leads to the result that the expanding measuring coil does not depart from the coil carrier because of its heat expansion
Data Source
AI summary
A measuring device that is able to function even in rough environments, for example under great heat or in environments in which water or steam is found, as is the case in rolling mills, among other environments, has a housing, a central measuring device that passes through the housing in a straight line, and a measuring coil that is disposed in the housing and encloses the measuring opening. The device has a coil carrier that is disposed in the housing radially outside of the measuring coil and carries the measuring coil.