Wire Rope Tension Measurement Using Lateral Deflection
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Solution Overview
Problem
Existing tension measuring devices for wire ropes face challenges in accurately measuring high tension over long periods due to calibration drift, nonlinearity, and strand slippage, especially under varying temperatures and conditions.
Innovation Solution
A tension measuring device that laterally deflects a wire rope using a clamp and spacer to limit deflection, combined with sensors and temperature compensation, allowing for precise tension determination based on deflection and wire rope properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in-line tension gauges are used to measure high tension forces, then the measurement capability is achieved, but calibration drift occurs over long periods reducing measurement accuracy
Solution Approach 1:
The patent replaces traditional in-line mechanical tension gauges with a magnetic resonance-based measurement system. The wire rope tension is measured indirectly through the effect of tension on the resonant frequency of a magnetic element, eliminating mechanical contact and associated calibration drift problems. The sensor is positioned adjacent to the wire rope without requiring the wire rope to pass through the measurement device.
Solution Approach 2:
The patent introduces a magnetic element as an intermediary between the wire rope and the measurement system. The magnetic element couples to the wire rope mechanically or through magnetic interaction, and its resonant frequency responds to the tension force. This intermediary allows non-contact or minimal-contact measurement while maintaining accuracy over long periods.
2Reliability
If traditional tension measurement methods are used, then simplicity is maintained, but nonlinearity and strand slippage occur under varying temperatures reducing reliability
Solution Approach 1:
The patent utilizes changes in resonant frequency of a magnetic element as a parameter to measure tension. The magnetic element's resonant frequency changes in response to tension-induced stress, providing a reliable measurement that is not affected by temperature variations or strand slippage. This parameter-based measurement approach enhances reliability across varying environmental conditions.
Solution Approach 2:
The patent transitions from direct mechanical force measurement to measuring the resonant frequency response of a magnetic element. This dimensional shift from mechanical domain to magnetic resonance domain allows for more reliable measurements under varying temperatures and loads, as the resonant frequency response is less susceptible to environmental interference.
3Ease of operation
If in-line tension gauges are installed, then direct force measurement is achieved, but installation complexity and difficulty of integration increase
Solution Approach 1:
The patent replaces complex in-line mechanical gauge installation with a simpler external sensor configuration. The magnetic sensor and magnetic element can be attached to or positioned adjacent to the wire rope without requiring the wire rope to be cut or threaded through a measurement device, significantly simplifying installation and integration into existing systems.
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
The device provides accurate tension measurement over broad temperature ranges and extended periods with reduced calibration drift and wear, enhancing measurement precision and ease of installation.
Implementation Method 1
a sensor configured to output a signal related to one or more forces applied to the tension measuring device by the wire rope
Data Source
AI summary
Tension measuring devices for measuring tension in wire ropes, and associated systems and methods, are generally provided. Tension measuring devices described herein may use force signals related to forces applied to a tension measuring device by a laterally deflected wire rope extending therethrough to determine a tension of the wire rope. Such embodiments may allow for long term accurate measurement of tension in high load wire rope applications.