RL Circuit Electromagnetic Testing for Wire Rope Defects
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Solution Overview
Problem
Existing electromagnetic testing methods are not suitable for continuous, online, and automatic testing due to their complexity, high costs, and sensitivity issues, making them unsuitable for high-speed industrial production environments.
Innovation Solution
An electromagnetic non-destructive testing method using a first-order RL circuit with direct-current excitation and zero-input responses to detect changes in inductance of a magnetizing coil, allowing for real-time, continuous, and automatic detection of defects in testing objects like wire rods, tubes, or stranded ropes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electromagnetic testing methods (magnetic particle testing, metal cross-sectional magnetic flux measuring method, magnetic flux leakage testing method, eddy current testing method) are used to achieve high accuracy and defect subdivision, then measurement precision is improved, but device complexity and cost increase significantly, making them unsuitable for industrial sites
Solution Approach 1:
The patent extracts and isolates the core functional element (magnetizing coil) from complex testing systems, using a simple first-order RL circuit to generate the necessary magnetic field. This eliminates the need for complicated signal generating and processing equipment while maintaining testing capability, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent employs a simple, low-cost RL circuit configuration with basic components (resistor, inductor, switch) that can be easily implemented and replaced. This simple circuit structure provides sufficient testing functionality without requiring expensive, complex equipment, thereby reducing device complexity while maintaining adequate measurement precision for industrial applications
2Measurement precision
If traditional electromagnetic testing methods are implemented on computer system platforms with complex signal processing, then measurement precision is improved, but ease of operation deteriorates due to manual intervention requirements, making them unsuitable for automatic continuous testing
Solution Approach 1:
The patent implements automatic switching between direct-current excitation response and zero-input response states through the RL circuit's inherent characteristics. The system automatically completes the testing cycle without manual intervention, with the circuit naturally transitioning between states based on the switching signal, thereby achieving both high testing sensitivity and full automation capability
Solution Approach 2:
The patent uses periodic switching between excitation and zero-input states to continuously test multiple objects. This periodic action enables automatic continuous testing by rhythmically repeating the magnetization and measurement cycle, eliminating the need for manual operation while maintaining testing precision through consistent periodic measurement
3Measurement precision
If traditional electromagnetic testing methods use complex signal generating and processing solutions with extremely high equipment requirements, then measurement precision is improved, but productivity decreases due to slow response and high costs
Solution Approach 1:
The patent replaces complex mechanical and electronic signal processing systems with a simple electrical RL circuit that naturally produces the required magnetic field and response signals. This substitution eliminates slow mechanical adjustments and complex signal processing, enabling rapid testing response while maintaining accuracy through the circuit's inherent electrical characteristics
Solution Approach 2:
The patent achieves high-speed testing by dynamically changing the circuit state parameters (switching between excitation and zero-input modes) rather than using slow, continuous signal processing. This parameter-based approach allows rapid transition between measurement states, significantly increasing testing speed while maintaining precision through controlled parameter variation
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 method enables sensitive and reliable online detection of defects and quality indicators, improving product quality, reducing unaccepted products, and enhancing safety by allowing for real-time monitoring during high-speed production.
Implementation Method 1
a first-order RL circuit to alternate a direct-current excitation response and a zero-input response... generating, by the magnetizing coil having the direct current changing alternately in magnitude flowing therethrough, a direct-current magnetic field changing alternately in magnetic field intensity
Implementation Method 2
placing a testing object having electromagnetic susceptibility in the direct-current magnetic field changing alternately in magnetic field intensity... so that the testing object is magnetized by the magnetic field changing alternately in magnetic field intensity while causing a change in magnetic induction intensity or magnetic flux of the magnetizing coil, thereby leading to a change in inductance of the magnetizing coil
Data Source
AI summary
A first-order resistor-inductor (RL) circuit is allowed to alternate a direct-current excitation response and a zero-input response so that a direct-current magnetic field generated by an inductor magnetizing coil changes alternately in magnetic field intensity with a change in magnitude of current. After a testing object is placed in the direct-current magnetic field changing alternately in magnetic field intensity, the testing object is magnetized and also causes a change in inductance of the magnetic field. Whether a change occurs in electromagnetic properties of the testing object can be determined and detected by detecting the inductance change of the magnetizing coil or detecting electrical characteristic change caused by the inductance change of the magnetizing coil, thereby determining whether quality defects such as steel wire cracks and wire breakage in a steel wire rope occur. Alternatively, the properties such as a sectional area or a zinc layer thickness can be analyzed.