Elevator Wire Rope Twist Inspection via Strand Counting
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Solution Overview
Problem
Uneven twist and tension in wire ropes used in elevators can cause vibration and potential breakage, leading to safety concerns and inaccurate tension measurements due to varying lengths, diameters, and elastic moduli.
Innovation Solution
A method using an image capturing device and processor to analyze the number of strand segments in wire ropes, comparing these numbers to determine twist and adjust the twist by calculating rotations and turning angles to ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wire ropes have different extent of twist, then rigidity varies, but tension measurements become inaccurate
Solution Approach 1:
The system performs preliminary inspection of wire rope twist before tension measurement by capturing images and counting strand segments. This preliminary action identifies wires with non-uniform twist, allowing operators to adjust or replace them before they compromise tension measurement accuracy, thus preventing measurement errors rather than detecting them after they occur.
2Reliability
If wire ropes have uneven tensions or different twist, then wear between wire ropes and traction wheel grooves becomes uneven, but this leads to vibration and safety concerns
Solution Approach 1:
The system performs preliminary inspection of wire rope twist uniformity before the wire ropes are installed or before regular maintenance intervals. By capturing images of the wire ropes and analyzing strand segment distribution, the system identifies potential problems with twist uniformity that could lead to uneven wear and vibration, allowing preventive maintenance before safety issues arise.
Solution Approach 2:
The system provides visual feedback through captured images and quantitative feedback through strand segment counting results. This feedback mechanism allows operators to verify the twist uniformity of wire ropes and make necessary adjustments, creating a closed-loop system that continuously ensures wire rope quality and prevents safety issues.
3Measurement precision
If manual inspection methods are used, then simplicity is maintained, but inspection accuracy and reliability are insufficient
Solution Approach 1:
The system replaces manual visual inspection with an automated image processing system. A camera captures images of the wire ropes, and software automatically counts strand segments to determine twist uniformity. This substitution of mechanical/manual inspection with optical and computational methods significantly improves measurement precision while the automated nature of the system keeps operational complexity manageable.
Data Source
AI summary
A method for inspecting twist of wire ropes is provided. The wire ropes support an elevator car, and each of the wire ropes includes a plurality of strands. The method is to be implemented by a processor and includes steps of: obtaining, for each of the wire ropes during movement of the elevator car, a number of strand segments that are present within a predetermined length of the wire rope; and comparing the numbers of strand segments that are obtained respectively for the wire ropes for analyzing the twist of the wire ropes, wherein the wire ropes are determined as having equal extent of twist when it is determined that the numbers of strand segments are identical, and the wire ropes are determined as having distinct extent of twist when it is determined that the numbers of strand segments are different from each other.