Research On Wear Detection System Of Cage Ear Sliding Sleeve For Steel Wire Rope Guide

As the guide device of steel wire rope guide in vertical shaft,the cage ear sliding sleeve plays the role of stabilizing the lifting container.The “Safety Regulations for Coal Mines” clearly stipulates that when the amount of wear exceeds the limit value,it must be replaced.Otherwise,the lateral movement of the lifting container will increase,and the danger of collision between the lifting container and the well wall and the well beam will be increased,thereby endangering the safe operation of the lifting container and even causing a major accident.Therefore,the detection of the wear amount of the cage ear sliding sleeve is particularly important.At present,the wear detection of cage ear sliding sleeve is mainly manual detected,which is not only time-consuming and laborious,but also has low detection precision.Due to the limitation of the underground actual installation space and the harsh working environment,most of the detection equipment cannot be directly used for the actual detection of cage ear sliding sleeve.Therefore,this paper designs a set of wear detection system for cage ear sliding sleeve that can meet the actual working conditions.And this system can automatically detect the current wear and wear position of the cage ear sliding sleeve during the normal operation of the lifting container.The main research work and conclusions of the thesis are summarized as follows:(1)The wear form of the cage ear sliding sleeve was analyzed.According to the variation law of the rigidity coefficient of the downhole steel wire rope guide and the swing characteristics of the lifting container,the force of the cage ear sliding sleeve is analyzed,and the conclusion that there is shear force exists on the end face is obtained.The ANSYS Workbench software was used to simulate the wear form of the inner wall of the cage ear sliding sleeve caused by the steel wire rope guide under the actual working conditions.Studies have shown that the inside of the groove of the cage ear sliding sleeve is worn near the end face earlier than the middle.(2)The scheme of wear detection system was designed.A method for detecting the wear amount of the end face based on the change of the resistance value in the circuit is proposed.The linear relationship between the reduction of the number of resistors in the parallel circuit and the amount of wear is established.By using FPC as the "switch" of the parallel resistance part,as the degree of wear gradually deepens,the parallel resistance is sequentially turned off,so that the real-time wear amount of the cage ear sliding sleeve is characterized by the change of the output voltage value.In order to ensure the reliability of the test results and to judge the specific wear position,it is determined that the end face of the wear detection device adopts four independent circuit arrangements.(3)The production of the wear detection system was completed.Firstly,based on the software and hardware requirements of the system,the overall architecture was designed.According to the area to be worn of the end face of the cage ear sliding sleeve,the specific pattern of the parallel circuit FPC is designed.According to the system detection scheme,a linear relationship of 0.5V change of the output voltage value per wear of 1mm is set.The MATLAB software was used to solve the optimal value of the parallel resistance,and the PCB board was designed and manufactured.Then the shell structure of the whole wear detecting device is designed,which meets the installation and protection of the hardware in the system and the assembly of the whole detection device and the cage ear sliding sleeve.Finally,the upper computer was designed by LabVIEW software to realize the visualization of the data.(4)The experimental study on the wear of the cage ear sliding sleeve was carried out.Based on the wear detection system,a simulation experiment platform was designed and installed.The feasibility of the detection method and the detection scheme was verified by experiments,and the reliability of the wear detection system was confirmed.Specifically: It was verified the conclusion that the portion of the inside of the groove of the cage ear sliding sleeve that is close to the end face takes precedence over the wear of the middle portion.The current wear amount of the cage ear sliding sleeve,the specific position where the wear occurs,and the real-time detection of the wear sequence are realized.It is confirmed that the closed conduction of the wire to the FPC fracture portion does not affect the analysis of the actual wear value,and the conduction probability gradually decreases as the radius of the wear groove increases.It is also proved that the oil mixed with iron powder and coal powder does not affect the detection results of the system.Finally,the law of the wire conduction detection circuit is further analyzed,and the line width and line spacing can be reduced to improve the detection accuracy.