Research On Mine Wire Rope Defect Detection System Based On Three Axis Magnetic

As a ferromagnetic component with strong bearing capacity and high tensile strength,steel wire rope is widely used in coal mining equipment,such as mine hoisting device,mining traction device,mining equipment,mine hoist equipment and so on.In the normal production process of coal mine,the steel wire rope of the mine hoist is used as a tool for transporting materials and personnel.Because of the long work and frequently use,the broken wire begins to appear in the stress concentration area.With the increase of the number of broken wires,the wire rope will break down once the wire rope is subjected to large load impact.The phenomenon of rope leads to the occurrence of mine accidents and seriously affects the normal production order of coal mines and the safety of personnel.Therefore,it is very important to study the new technology and method of mine wire rope defect detection.Every coal mine and steel wire rope use unit have been exploring the effective method of detecting wire rope flaw.However,because of the particularity of the wire rope structure and the complexity of the working environment,as a relatively weak link in the coal industry,it is easily subjected to many kinds of inaccuracy load and bad environmental factors in the process of drawing,bending,torsion and corrosion during the force process,it is difficult to detect the flaw of wire rope.At present,a set of complete detection methods and detection theories have not been formed to meet the requirement of actual detection in coal mines.In this paper,by analyzing the three-dimensional field information of magnetic memory signal around the flaw of steel wire rope,a three axis magnetic memory detection method for the simultaneous acquisition of normal plane and tangent plane characteristic signals is proposed,and study the broken wire flaw of the most common defect type.On the basis of three axis magnetic memory detection method for mining wire rope,a three axis magnetic memory detection scheme is designed,including the hardware design and software development of the three axis magnetic memory testing of the mining wire rope.In the hardware part,the three axis magnetic memory array sensor,magnetic memory signal conditioning circuit,magnetic memory main control circuit and power supply circuit are designed,and the hardware production is made according to the PCB design diagram.In the MCU,a hybrid programming method of assembly language and C is used to compile the program of signal acquisition,signal transmission and signal preprocessing.On the upper computer,the feature extraction and graphical display of magnetic memory signal are carried out by QT,and the functions of saving,querying and printing of historical data are realized.A method of empirical wavelet denoising is put forward,and the simulation design of magnetic memory signal is carried out on computer.For wireless communication needs of the MCU and upper computer,wireless serial communication module is adopted in this paper to realize remote flaw detection and early warning for mine wire rope.In order to verify the validity of the three axis magnetic memory detection method proposed in this paper,a mining steel wire rope three axis magnetic memory testing platform is set up in the laboratory.The experimental results show that the three axis magnetic memory array sensor designed in this paper can collect the signal of the broken wire of the wire rope of the mining wire rope,and the effect of noise reduction after using the EEMD-wavelet denoising method is obvious.The two level synthetic judgment method is used to judge the flaw of the wire rope,which avoids the misjudgment of the steel wire rope flaw detection by the single component detection method and improves the accuracy of the detection.The experimental data collected from the experimental platform in this paper can be used to classify the flaw.