一种基于单轴向充磁永磁环励磁的钢丝绳无损检测方法

A Nondestructive Testing Method for Steel Wire Rope Based on Axial Magnetization of Single Permanent Magnet Ring

为提高钢丝绳缺陷检测能力,简化励磁结构,提出一种基于单个轴向充磁永磁环励磁的钢丝绳无损检测方法。通过分析钢丝绳缺陷在单个轴向充磁永磁环励磁方法下产生的漏磁场,得到该方法能通过漏磁场感知缺陷运动方向的结论。在此基础上,利用COMSOL软件对该励磁方式进行有限元建模,通过仿真计算缺陷处漏磁的分布,验证了结论的正确性,分析了影响漏磁场的因素,并结合霍尔元件性能参数,给出了传感器的最佳布置位置。最后,通过设计信号调理电路,结合3D打印实现传感器结构,完成了实验平台搭建。仿真结果表明,对于同一缺陷,基于该励磁方式产生的最大漏磁场明显大于传统方式。实验结果表明,对于10 mm粗的钢丝绳,当霍尔元件布置的提离值为3 mm和8 mm时,均能够通过缺陷处漏磁信号感知钢丝绳运动方向。

In order to improve the detection ability for steel wire rope defects and simplify the excitation structure,a nondestructive tes-ting method for steel wire rope based on a single axial magnetizing permanent magnet ring is proposed.By analyzing the leakage magnet-ic field generated by a single axial magnetized permanent magnetic ring excitation method,it is concluded that the motion direction of the defect can be sensed through leakage magnetic field.On this basis,the finite element modeling of the excitation mode is carried out by using the COMSOL software,and the distribution of magnetic leakage at the defect is calculated through simulation.The correctness of the conclusion is verified,and the factors affecting the magnetic leakage field are analyzed.Combined with the performance parame-ters of Hall element,the optimal location of the sensor is given.Finally,through the design of signal conditioning circuit,combined with 3D printing,the sensor structure is realized,and the experimental platform is built.The simulation results show that for the same defect,the maximum leakage magnetic field generated by the proposed excitation method is obviously larger than that of the traditional method.The experimental results show that for 10 mm thick steel wire rope,when the lift value of Hall element arrangement is 3 mm and 8 mm,the movement direction of steel wire rope can be sensed through the MFL signal at the defect.