基于光纤测温的托辊轴温检测及热传导模型研究

针对带式输送机运转过程中因传输托辊故障导致摩擦升温引发火灾的问题,基于热传导原理设计了2种用于不同测量需求的光纤温度传感装置,实验测试并分析了该2种感温装置的热传导灵敏度;设计搭建了胶带长度为50 m的带式输送机实验测试系统平台,开展了空间温度场数据仿真测试,根据模拟实验获得的数据,建立了托辊摩擦点温升与轴温热传导模型,以及轴温与热管光纤温度传感装置之间的热传导模型,用于火灾预警监测;模拟测试获得托辊轴承故障温度变化曲线,推导出托辊轴温升斜率函数,论证利用其最大温升斜率来辨识托辊坏轴。研究成果能够为煤矿、港口等工业现场的带式输送机系统火灾预警提供技术支撑。

Research on roller shaft temperature detection and thermal conductivity model based on optical fiber temperature measurement

Concerning the phenomenon of fire due to frictional heating caused by transmission roller fault in the running process of the belt conveyor,two kinds of optical fiber temperature sensor for different measurement requirements were designed according to the principle of heat conduction,and experimentally tested and analyzed the thermal conductivity sensitivity of the two temperature sensors;the experimental test system platform of 50 m belt conveyor was designed and built,and the simulation test of spatial temperature field data was carried out,based on the data obtained from the simulation experiment,the model of heat transfer between the roller friction point and the shaft temperature,as well as the heat transfer model between the shaft temperature and the optical fiber temperature sensor of the heat pipe were established for fire warning monitoring;roller bearing fault temperature change curve was obtained by simulation test,and derived the temperature rise slope function.It has been demonstrated that the maximum temperature rise slope is used to identify the feasibility of the roller shaft.The research results can provide technological support for early warning of belt conveyor systems in coal mines,ports and other industrial sites.