Abstract
The manual visual inspection of ropes, both wire and fibre ropes, is still the preferred method of choice for the inspection of suspension means and for safety assessment. As the ropes are usually of a longer length of several hundred metres, manual visual inspection can lead to undetected defects due to inspector fatigue. On the other hand, the inspector only sees the surface facing him and there is no recorded data of the inspection that can be used for clarification in case of a rope breakage. Due to these points, it is advantageous to perform an automated camera-based inspection where several cameras are arranged around the rope. Especially with high modular fibre ropes, which are used in more and more fields of application, visual inspection is a decisive point in the evaluation of operational safety. IFT is currently conducting and has conducted research projects in this field of work.
Highlights
Ropes, wire and fibre ropes, that are used in running applications like elevators, cranes etc. have a limited lifetime
For the above mentioned Magneto inductive rope testing (MRT) and Ultrasonic inspection software-based recording can be done and in the event of an accident be used for an analysis. This cannot be done with a manual visual inspection and it has to be relied on the memory and testimony of the inspector
A possible approach to ensure a safe use of fibre ropes in rope drives the discard criterias should be used in combination like it is done in ISO 4309 for wire ropes [9]
Summary
Wire and fibre ropes, that are used in running applications like elevators, cranes etc. have a limited lifetime. Wire and fibre ropes, that are used in running applications like elevators, cranes etc. For wire ropes several methods are available like magneto-inductive rope testing [1], (automated) visual inspection or special methods like X-Ray, ultrasonic or the use of acoustic sensors. The rules and standards that can be applied for the monitoring and inspection of wire ropes are much elaborated. The methods of evaluating and monitoring fibre ropes are less advanced and elaborated compared to wire ropes. Several other methods were investigated over the last years like implementing coated fibres to use the method of MRT [5] or the usage of ultrasonic [6]. At IFT a system for the automated visual inspection and monitoring of fibre ropes is currently developed called Fibrespect, based on a system that originates in ropeway and. This paper deals with the current developments of IFT in this field and gives a brief outlook in coming developments
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