Crucible Metal Feed Control Using Microwave Level Detection
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Solution Overview
Problem
The metal material in the crucible is not immediately molten after loading and takes time to melt, leading to inefficient supply and increased energy consumption due to mismatched supply timing with the crucible's molten state.
Innovation Solution
A metal material supply device equipped with a material transportation unit, detection unit, and control unit that adjusts supply based on crucible state, including a microwave detection system to monitor material height and prevent bridging, with a movable mechanism and discharge port control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal material is continuously supplied to the crucible without monitoring, then the supply speed is fast and productivity is high, but the metal material cannot be supplied at the appropriate timing leading to energy waste and increased costs
Solution Approach 1:
The patent implements a feedback control system where the material detection unit continuously monitors the piled-up state of metal material in the crucible and provides this information to the material transportation control unit. The control unit adjusts the material supply based on the detected state, ensuring material is supplied only when the crucible is ready to receive it, thereby preventing energy waste while maintaining high productivity
Solution Approach 2:
The system enables the crucible to effectively request material by reaching a state where material can be piled up (indicating readiness to receive more material). The detection unit detects this self-generated signal, and the control unit responds by supplying material, creating a self-regulating supply mechanism that eliminates energy waste
2Loss of energy
If metal material is supplied according to crucible molten state with detection and control, then energy efficiency is improved and costs are reduced, but the device complexity increases due to addition of detection and control units
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with a microwave-based detection unit that non-contactly measures the piled-up state of metal material. This substitution reduces mechanical complexity while maintaining accurate detection capability, enabling energy-efficient control without excessive device complexity
Solution Approach 2:
The material detection unit serves multiple functions: it detects the piled-up state of material, determines when the crucible is ready to receive material, and provides feedback for controlling the transportation unit. This multi-functionality reduces the need for separate sensors and control mechanisms, thereby limiting the increase in device complexity
3Productivity
If material transportation unit operates continuously without monitoring, then productivity is maintained, but bridging state may occur causing defects and production interruption
Solution Approach 1:
The material detection unit provides continuous feedback on the piled-up state of metal material in the crucible. When the detection unit identifies that material has reached a height where bridging may occur, it signals the control unit to stop or adjust the transportation unit, preventing bridging defects while maintaining continuous productive operation
Solution Approach 2:
The system takes preliminary action by detecting the piled-up state before bridging actually occurs. The control unit stops material supply in advance when the detection unit indicates the crucible is full or near-full, preventing the harmful bridging state from developing and ensuring reliable defect-free production
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 timely and efficient supply of metal material to the crucible, reducing energy costs and preventing defects by detecting and adjusting supply operations based on crucible conditions.
Implementation Method 1
a microwave level meter that measures a height of the metal material piled up in the crucible
Implementation Method 2
an induction type furnace is typically used that heats a metal material in a crucible by generating induction current
Data Source
AI summary
A metal material supply device which is annexed to a metal melting furnace has a vibration trough for transporting metal material to be supplied to a crucible; the transported metal material is discharged from a material discharge port that is provided at the front end of the vibration trough; the metal material supply device is movable between a material supply position where the material discharge port is disposed above the crucible and a retracted position from the material supply position, and supplies the metal material to the crucible at the material supply position; the upper end of the metal material supplied to the crucible and piled up is detected by a microwave level meter, and the material supply operation by driving the vibration trough is controlled on the basis of the detected value.