采掘装备截割煤层过程中截齿温度场特性研究  

Research on temperature field characteristics of cutting teeth during coal seam cutting with mining equipment

作　　者：司垒[1] 王忠宾[1] 戴剑博 魏东 顾进恒 Si Lei;Wang Zhongbin;Dai Jianbo;Wei Dong;Gu Jinheng(School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学机电工程学院,徐州221116

出　　处：《仪器仪表学报》2024年第11期117-131,共15页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52174152);徐州市基础研究计划(KC23051);山东省中央引导地方科技发展资金(YDZX2024119)项目资助。

摘　　要：采掘装备在截割煤层过程中,不同性状的煤岩体会导致截齿温度发生变化。为了探究截齿温度场的变化特性,分析了截齿截割煤层过程的热源分布情况,利用热源法建立了截割煤层过程中截齿温度场的理论计算模型,并考虑到采掘装备的实际工况条件,推导了喷雾系统对流换热系数的计算过程。以MG2×55/250-BWD型采煤机为研究对象,基于ABAQUS有限元软件建立了截齿旋转截割煤岩模型,研究了不同工况下截齿温度场的分布情况与变化规律;接着,基于Fluent流体仿真软件建立了喷雾冷却模型,获取了不同喷雾压力下截齿的对流换热系数,进而将换热系数带入ABAQUS有限元模型来模拟水喷雾冷却下截齿截割煤岩过程的温度场;最后,搭建了滚筒截割煤岩温度采集实验台,设计了截齿温度采集系统,开展了不同工况下滚筒截割煤岩实验,分析了截齿温度场的变化规律,验证了理论计算与仿真模型的正确性。结果表明,不同工况下截齿的温度场具有不同的分布形态,且最高温度与滚筒转速、牵引速度、煤岩坚固性系数呈正相关性;水喷雾压力与截齿温度呈反比,与常规条件相比水喷雾冷却能使截割温度场温度降低20%以上。研究成果为基于截齿温度场的煤岩性状识别提供新的理论和方法。During the process of cutting coal seams with mining equipment,different characteristics of coal and rock can cause changes in the temperature of the cutting teeth.In order to explore the changing characteristics of the temperature field of the pick,the heat source distribution in the process of cutting the coal seam by the pick is analyzed.The theoretical calculation model of the temperature field of the pick in the process of cutting the coal seam is established using the heat source method.Considering the actual working conditions of the mining equipment,the calculation process of the convection heat transfer coefficient of the spray system is deduced.Taking the MG2×55/250-BWD shearer as the research object,a model of rotating cutting of coal and rock is established based on ABAQUS finite element software,and the distribution and variation of the temperature field of pick under different working conditions are studied.Based on Fluent fluid simulation software,the spray cooling model is established,and the convective heat transfer coefficient of the pick under different spray pressures is obtained,and then the heat transfer coefficient is brought into the ABAQUS finite element model to simulate the temperature field of the pick during coal cutting under water spray cooling.Finally,a temperature collection experimental platform for drum cutting coal and rock is built,and a temperature collection system for cutting teeth is designed.Some experiments on drum cutting coal and rock under different working conditions are conducted,and the variation law of the temperature field of the cutting teeth is analyzed.The correctness of designed theoretical calculations and simulation models is verified.The results show that the temperature field of the pick has different distribution patterns under different working conditions,and the maximum temperature is positively correlated with the rotating speed of the cylinder,the traction speed and the coefficient of coal rock firmness.Water spray pressure is inversely proportional

关 键 词：采掘装备 煤岩截割 截齿温度场 喷雾冷却 

分 类 号：TH6[机械工程—机械制造及自动化]