Portable Wire Rope Open Loop Magnetization Detection Probe Structure Optimization

Magnetic flux leakage non-destructive testing technology is widely used in wire rope testing due to its low requirements on the surface of the object to be inspected and high testing accuracy.There are various types of portable testing probes based on this technology,but they are bulky,heavy and inconvenient.Quick detection and other issues.On the basis of comparing the existing portable wire rope detection probes at home and abroad,this paper proposes specific problems such as excessive weight to be solved,and optimizes the existing probes in terms of lightweight and easy operation.First,from the perspective of the magnetization method of magnetic flux leakage detection,the method of axial magnetization of the open-loop permanent magnet is determined after the static magnetic field simulation analysis and comparison,which reduces the weight of the magnetizer from the structure.For the three main components of the magnetizer,sensitive element and outer shell of the detection probe,optimization methods based on the combination of static magnetic field simulation and experimental verification,the combination of theoretical analysis and experimental verification,and the comparison of SolidWorks modeling and structural parameters are respectively proposed.,It is clear that the ultimate goal of achieving a weight reduction of over 40% and a lift-off value of 15 mm and above.Aiming at the problem that when the sensitive element is a coil,the signal amplitude cannot be quantitatively compared due to the different scanning speeds,an automatic scanning experiment platform was built to avoid adverse factors such as different scanning speeds and large vibration of the probe from affecting the experimental results.Then,by means of static magnetic field simulation and experimental verification,the influence of the change of key dimensions in the magnetizer on the amplitude and signalto-noise ratio of the magnetic flux leakage signal is studied.In this process,corresponding research has been done on the types and combinations of magnetic sensitive components,large lift-off detection,changes in noise signal amplitude,and the absence of armature in the magnetizer;finally the length of the magnetizer is shortened from the original 90 mm To45mm,it was found that one of the coils stacked on top of each other can detect a single broken wire under 15 mm lift-off.Finally,in combination with the use requirements of the detection probe and the molding process,three probe housings are given: the cover type,the three-stage injection molding type,and the non-wear sleeve type.After briefly introducing the characteristics of each scheme,the advantages and disadvantages of each scheme were compared in detail through a list,and finally one of the schemes was determined as the final optimization result based on the actual situation.After the size of the magnetizer,the combination of magnetic sensitive components and the shape of the outer casing were determined,the optimized probe was tested and verified.The results showed that the goals of weight reduction and convenient operation were basically achieved.