Wire Rope Lay Length Measurement via Magnetic Flux
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring the lay length of wire ropes, especially when they are under tension and in use, are inefficient and prone to error due to the rope's length and surface coatings, making it difficult to monitor rope condition effectively for operational safety and longevity in applications like mining.
Innovation Solution
A method and apparatus using a magnetic flux circuit that senses changes in magnetic field strength along the wire rope's spirally grooved surface, allowing for the measurement of lay length by subtracting lateral movement components from sensor signals to isolate oscillations caused by surface height variations, enabling continuous monitoring even when the rope is in use and under tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct measuring devices are used to measure lay length, then measurement can be performed, but the rope must be taken out of service causing shutdowns and the measurement is prone to error due to rope length
Solution Approach 1:
The patent replaces mechanical direct measurement devices with a magnetic field-based sensing system. Magnetic sensors detect variations in magnetic flux caused by the rope's surface geometry, enabling non-contact measurement while the rope remains in service, thus eliminating shutdowns and improving operational continuity without sacrificing measurement accuracy.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the rope and the measurement system. Magnetic sensors detect changes in magnetic flux caused by the rope's lay length variations, allowing indirect measurement of lay length without physical contact with the rope surface, thereby enabling continuous measurement while in service.
2Measurement precision
If visual inspection methods are used, then lay length can be measured, but the rope surface coatings and protective covers obscure the strands making measurement difficult
Solution Approach 1:
The patent replaces optical visual inspection methods with magnetic field-based detection. Magnetic sensors are not obstructed by surface coatings, protective covers, or dirt, allowing accurate detection of lay length variations through the magnetic flux variations caused by the rope's geometric structure, thereby eliminating the interference of surface contaminants.
3Productivity
If the rope is measured while under tension and in use, then continuous monitoring is achieved, but lateral movements and surface height variations complicate the measurement
Solution Approach 1:
The patent employs sensors that continuously detect magnetic flux variations and provide feedback signals that are processed to compensate for lateral movements and surface height variations. The system uses the detected magnetic variations as feedback to maintain accurate lay length measurement despite the dynamic conditions of tension and movement.
Solution Approach 2:
The patent uses magnetic field sensing instead of mechanical measurement methods. Magnetic sensors detect lay length variations through magnetic flux changes and are unaffected by lateral movements or surface height variations, enabling continuous accurate monitoring while the rope is under tension and in use.
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 approach allows for accurate and continuous measurement of lay length, reducing the need for frequent shutdowns and minimizing errors caused by surface coatings, thereby enhancing operational safety and extending the lifespan of wire ropes.
Implementation Method 1
A magnetic flux circuit is established, part of which magnetic flux circuit occupies a region of the advancing wire rope. Changes of magnetic field strength or magnetic flux are sensed in the stated region of the rope due to variations of proximity of the wire rope from fixed positions spaced circumferentially around the wire rope
Data Source
AI summary
The invention relates to a method and apparatus for measuring lay length of a wire rope having a number or external strands to form a rope having spiral grooves in the surface between the strands. A magnetic flux circuit is generated, part of which is formed within a region of the advancing wire rope. Variations of magnetic field around the region of the rope or variations of magnetic flux entering or leaving the rope are sensed by at least two sensors arranged around the rope. Signals from the sensors are subtractively combined to eliminate variations due to off-axis movements of the rope, and the combined signals reveal an oscillating pattern due to the undulating surface of the rope. Linking the oscillating pattern to distance along the rope reveals the lay length, which corresponds to a number of oscillations which is the same as the number of strands at the surface.