Detection Of The Simulation And Experimental Study On Residual Strength Detection Of Steel Wire Rope Based On Magnetic Characteristic Parameters

Wire rope is widely used in many fields such as coal,petroleum,metallurgy and other fields.When the service life of the wire rope is prolonged,damage such as abrasion,rust,and broken wire will inevitably occur.It is directly related to the normal progress of production and the safety of personnel lives,the safety detection of the state of service is of great significance.Therefore,in order to ensure the safe operation of the wire rope,it is necessary to evaluate the safety performance of the wire rope during use in real time and effectively.The residual strength of the wire rope is an important indicator for the safety performance evaluation of the wire rope.It is directly related to the loss of the metal cross-sectional area.Therefore,this paper is based on the combination of theory,simulation analysis and experimental research.Study on metal cross-sectional area loss detection,wire rope excitation device optimization,wire rope residual strength solution.Firstly,this paper introduces the principle based on the loss of cross-section of magnetic flux detection.The theoretical calculation is made on the relationship between the change of the cross-sectional area of the wire rope and the magnetic flux in the wire rope.The theoretical relationship between the induced voltage and the change in the cross-sectional area of the wire rope is obtained after the detection coil is converted and then integrated by the integrator.Eliminating the adverse effects of time variables on the test results and provide a theoretical basis for subsequent testing.Secondly,this paper establish the wire rope excitation device and the wire rope simulation model.The finite element simulation study on the influence of the length of the excitation device,the excitation device and the wire rope gap,and the radial position of the wire rope on the magnetization of the wire rope was carried out.Through comparative analysis,a useful conclusion is obtained,which provides theoretical guidance for the design of wire rope excitation device.Based on the simulation results,the wire rope excitation device was optimized and simulated.The variation of the magnetic field of the wire rope with three different cross-section losses under the action of the excitation device was simulated.The results show that different cross-sectional area losses can be distinguished,indicating that the excitation device can well meet the requirements of wire rope cross-sectional area loss detection excitation.Thirdly,by using the ANSYS Workbench to simulate and analyze the wire rope specimens with different cross-sectional area under different load conditions,and obtain useful conclusions.According to the simulation results,the residual strength formula of steel wire rope based on equivalent strain and equivalent stress is obtained.The residual strength of steel wire rope in both solutions is linearly reduced with the increase of the section loss ratio.Through comparative analysis,the selection basis of the method for solving the safe service tension of steel wire rope is given.Fourthly,this paper design and build an excitation detector and a signal processing acquisition system were developed based on the simulation conclusion.Based on the self-made steel wire rope test platform,a test system for the residual strength detection of steel wire rope based on magnetic parameters was built.The wire rope test rig is used to stretch the wire rope test pieces of different broken wires by different loads.The signal is acquired by the excitation detection and signal processing acquisition system,and the detection signal is processed to extract the feature value.The relationship between the test results and the tensile force in the case of the same damage of the wire rope test piece was studied.It is analyzed that the loss of the cross-sectional area and the applied load are the same,the position of the loss of the metal cross-sectional area of the same strand or different strands is different(inside and outside),and the uneven distribution of the cross-sectional area loss of the steel cord has an influence on the measurement result of the excitation detector.The relationship between the detected voltage and the loss of cross-sectional area under the same tensile force was studied and determined.Through the experiment,the relationship between the detection voltage of the cross-sectional area loss detector and the loss of the cross-sectional area is determined,and the relationship between the residual strength and the cross-sectional area loss ratio is obtained through simulation.The relationship between the residual intensity and the detected voltage can be established by the intermediate amount of the cross-sectional area loss.Therefore,the residual strength of the wire rope can be detected by the cross-sectional area loss detector designed in this paper,which provides a reference for further research on the residual strength detection of multi-magnetic parameters.