Cable Sheave Wear Detection via Standstill Distance Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reliability of detecting wear on cable sheaves in cable car systems is compromised by operational conditions such as temperature fluctuations and vibrations, making it difficult for contactless sensors to accurately measure distance and detect wear during system operation.
Innovation Solution
Measure the distance between the hoisting cable and the cable sensor when the system is at a standstill, accounting for thermal expansion and using existing cable position sensors to detect wear, which reduces operational influences and eliminates the need for additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distance measurement is performed during operation using contactless sensors, then wear detection is enabled, but measurement precision deteriorates due to temperature fluctuations, thermal expansion, and vibrations
Solution Approach 1:
The patent applies preliminary action by measuring the distance between the cable and sheave during standstill conditions before operation begins. This allows wear detection to be performed under controlled conditions without the interfering effects of thermal expansion, friction heating, and vibrations that occur during operation, thereby maintaining high measurement precision while enabling reliable wear detection.
2Reliability
If cable sheave wear is monitored continuously during operation, then operational restrictions can be prevented, but measurement reliability deteriorates due to harsh operating conditions
Solution Approach 1:
The patent extracts the wear measurement function from the operational state by performing distance measurements during standstill conditions. This separates the measurement process from the harmful operational factors (temperature fluctuations, friction heating, vibrations), allowing accurate wear detection without being affected by these harmful factors while still enabling timely replacement decisions.
3Measurement precision
If additional sensors are installed to improve measurement accuracy during operation, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent uses existing cable position sensors that are already installed in the cable car system for their intended purpose of monitoring cable position during operation. By repurposing these existing sensors to also perform wear detection during standstill conditions, the system achieves accurate wear measurement without adding any additional hardware, thereby avoiding increased device complexity.
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 provides more precise and reliable wear detection, allowing for timely replacement of worn cable sheaves and reducing operational disruptions, while also enabling the monitoring of wear progression over time.
Implementation Method 1
The cable position is monitored by means of contactless sensors, for example inductive proximity sensors
Implementation Method 2
ambient temperature fluctuations of several 10° C. are possible over a day, which can lead to thermal expansion (in the sense of becoming smaller or larger) of the cable sheave
Implementation Method 3
Due to the friction between the hoisting cable and the cable sheave or the running surface of the cable sheave, cable sheaves can heat up during operation in relation to the environment and in particular also in relation to the sensor
Data Source
AI summary
For reliable detection of the wear on a cable sheave of a cable car system, the distance between a cable sensor and a hoisting cable is measured when the cable car system is at a standstill and the wear on the at least one cable sheave is deduced from the distance measured at a standstill.