Research On Wire Rope Defect Detection Technology Based On Permanent Magnet Excitation

In modern industry, wire rope is widely used in traction, bearing, etc. Its running state is directlyrelated to the equipment and personnel security. Based on the scheme of the permanent magnetexcitation and magnetic flux leakage detection, we designed a wire rope defect detection systemWell-adapted in the industrial field, and on this basis of the system, we carried out a large number ofexperiments, to research the defect signal characteristics and detection technology.Due to the narrow, dangerous environment, which is not suitable for the inspectors to stay long,we use the idea of modular in the system design. The system is composed of permanent magnetexcitation module, data acquisition and pre-processing module, wireless data transmission moduleand monitoring platform software, this design can make the inspectors away from the scene,improving their working environment, it is very suitable for the long-term and real-time onlinemonitoring. Paper studies the characteristics of the wire rope defect signal and the impact of the wirerope structure for detection, on the basis of theoretical calculations and software simulation. We useefficient excitation source to ensure adequate magnetization and reduce volume, the exciter structureis reasonable designed to reduce magnetic interference, and optimized according to experimentalfeedback. Sensor space layout is reasonably arranged in order to reduce the influence of magnetic fluxleakage for signal detection. We designed the hardware and software of the data acquisition andpre-processing module, and completed the joint debugging with the wireless data transmissionmodule. We studied the rope defect signal characteristics and detection methods, programmed themonitoring platform software, which realizes the qualitative detection and quantification in theautomatic mode and manual mode. Through the experiment, we studied the impact of theconfounding factors, such as deflection angle, lift-off, vibration etc, and tested its sensitivity andquantification accuracy.Based on the system, we explored joint detection of LF and LMA defects, in order to providetesting support for optimizing the rope retirement standards. The system is applied to detect an aerialbasket company’ wire rope in service, and get their praises. Based on feedback from field testing, weimproved the system.