Electromagnetic Flow Sensor for Molten Metal Detection
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Solution Overview
Problem
Current methods for measuring the flow of liquid metals in casting plants are inaccurate and prone to large tolerances, failing to meet the increasing demands for quality control, with existing technologies being impractical or expensive for real-time monitoring in harsh conditions.
Innovation Solution
A device with a first vessel and a second vessel, where liquid metal flows through a shroud tube and/or dip tube, equipped with sensors below the vessels to detect flow rates and control elements to regulate the flow, ensuring uniform filling levels and product thickness, utilizing sensors that measure flow directly below the control elements for rapid and precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect measurement methods (weighing vessels, measuring withdrawal speed) are used, then the device complexity is low, but the measurement precision is insufficient
Solution Approach 1:
The patent replaces mechanical measurement systems (weighing vessels, speed sensors) with an electromagnetic measurement system. A magnetic field is generated by a coil, and the flow of liquid metal through the magnetic field induces a voltage signal that is detected by a pickup coil. This substitution of mechanical measurement with electromagnetic measurement achieves higher precision while maintaining relatively simple device structure.
Solution Approach 2:
The patent changes the measurement parameter from indirect mechanical parameters (weight, speed) to direct electromagnetic parameters (induced voltage). By measuring the voltage induced by the liquid metal flow in the magnetic field, the system achieves more accurate and direct flow rate measurement without complex mechanical measurement chains.
2Measurement precision
If electromagnetic flow rate sensors with magnetic substances are used, then the measurement precision improves, but the ease of operation deteriorates due to impracticality and cost
Solution Approach 1:
The patent extracts and eliminates the problematic magnetic substance deposition step from the measurement system. Instead of requiring magnetic substances to be deposited on the liquid metal surface (which is impractical and expensive), the system uses a magnetic field generated by a coil that acts on the liquid metal flow directly, with the induced signal detected by a pickup coil. This removes the complex and costly magnetic substance handling while maintaining real-time measurement capability.
3Manufacturing precision
If direct control of flow rate is implemented, then the manufacturing precision improves, but the stability of the control system deteriorates due to rapid response
Solution Approach 1:
The patent implements a feedback control system where the induced voltage signal from the liquid metal flow is continuously monitored and fed back to control the pouring flow rate. This closed-loop feedback mechanism allows the system to respond rapidly to deviations while maintaining stability through continuous adjustment, achieving both high manufacturing precision and control system stability.
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 solution provides accurate and rapid control of liquid metal flow, reducing variance in metal levels and improving product quality by minimizing settling time and avoiding instability in the control system, while allowing for direct measurement of flow rates and product thickness control.
Implementation Method 1
electromagnetic flow rate sensors are known from JP 7181195, which can measure the flow rate of a hot molten metal in real time using a magnetic substance and a magnetic pickup
Data Source
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AI summary
The invention relates to a device (1) for measuring the flow rate of molten metal in particular, comprising a first vessel (2) and a second vessel (8), wherein the molten metal (3) is supplied in the first vessel (2) and flows into the second vessel (8) by way of a shroud tube (7), wherein the molten metal (3) is stored temporarily in the second vessel (8) and flows into a mold or another vessel (15, 16) by way of at least one first immersion tube (17, 18), wherein the flow rate of the molten metal (3) through the at least one shroud tube (7) and/or the at least one immersion tube (17, 18) is detected by at least one sensor (9, 21, 22) arranged beneath the respective vessel (2, 8). In addition, the invention relates to a method in this regard.