Cable Inspection Device With Driven Rollers
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Solution Overview
Problem
Existing methods for inspecting long load-bearing cables in structures like bridges are inefficient and lack reproducibility, often requiring manned devices and resulting in unpredictable inspection outcomes.
Innovation Solution
An unmanned inspection device with at least three rollers, driven by a motor, allows for precise and reproducible movement along the cable, using sensors and data recording methods to characterize the cable's condition, minimizing damage and ensuring accurate data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manned inspection devices or aerial work platforms are used to inspect long cables, then inspection can be performed, but the inspection results are unpredictable and efficiency is low
Solution Approach 1:
The inspection device is equipped with self-propulsion capability through driven rollers that contact the cable, allowing it to move autonomously along the cable without requiring external manipulation or manned operation. The device independently controls its movement to predetermined positions and performs inspections, eliminating dependency on human operators or complex external support systems.
Solution Approach 2:
The patent replaces manual/manned inspection operations with an automated mechanical system. The inspection device uses driven rollers to propel itself along the cable and incorporates sensors for automated data collection, substituting human labor and aerial work platforms with a self-contained mechanical inspection system that provides consistent, reproducible results.
2Measurement precision
If the inspection device moves along the cable without precise positioning, then inspection coverage is achieved, but reproducible inspection of specific positions cannot be ensured
Solution Approach 1:
The control system receives feedback from sensors that detect the inspection device's position on the cable and compares it with predetermined target positions. Based on this feedback, the control system adjusts the driving torque applied to the rollers to achieve accurate positioning. This closed-loop control enables the device to return to specific positions with high reproducibility (accuracy of 5 mm or better) while managing system complexity through automated feedback mechanisms.
3Speed
If rollers are driven with high force to move the inspection device quickly, then inspection speed increases, but the cable surface may be damaged
Solution Approach 1:
The driving force applied by the rollers is dynamically adjusted based on real-time conditions. The control system monitors parameters such as roller slip, cable surface condition, and device position, and accordingly modulates the driving torque. This dynamic control allows the inspection device to move at optimized speeds while preventing excessive force that could damage the cable surface or anti-corrosion layers, adapting the propulsion force to match actual operational requirements.
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
Enables reliable and precise inspection of long cables, allowing for repeatable assessments of cable conditions over time with high accuracy, reducing the risk of unexpected breaks and improving safety.
Implementation Method 1
at least three rollers, by means of which the rope to be inspected can be traversed with the inspection device, wherein at least one roller is driven by at least one motor
Data Source
Figure 1
Figure 2
AI summary
The method involves receiving data using an injection unit (10) for characterizing a condition of a cable (1), where an injection device (A) includes three rolls (6) that are connected with the cable in a force-fitting manner. A cable roll is actuated by a motor (5), so that an injection device is moved to the cable, and the motor is controlled so that a predetermined position of the injection device is reproducible initiated at the coil. Data is affiliated for characterizing a condition of the cable correlated with the respective position. An independent claim is also included for an injection device for inspecting a cable, comprising three rolls.