滚轮罐耳胶轮动态热物性能及瞬态温度场研究  

Dynamic thermophysical properties and transient temperature field of rubber wheel of roller guide shoe

作　　者：瞿超[1] 朱真才[1] 陈国安[1] 彭玉兴[1] 徐蕾[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116

出　　处：《煤炭学报》2010年第1期154-159,共6页Journal of China Coal Society

基　　金：国家高科技发展计划(863)基金资助项目(2009AA04Z415);教育部科学技术研究重点资助项目(107054);高等学校博士学科点专项科研基金资助项目(20060290505)

摘　　要：为研究聚氨酯(PU)和尼龙复合材料(PA1010+20%PTFE+5%MoS2)两种滚轮罐耳胶轮材料的动态热物性能,以及在矿井提升过程中的温度场,利用DSC-TG和LFA对其进行了热分析实验。结果表明:随着温度升高,聚氨酯和尼龙复合材料的比热容快速增大,热扩散系数呈指数规律下降,导热系数变化较为平稳;尼龙复合材料的热扩散系数和导热系数明显低于聚氨酯。结合胶轮使用工况,基于热传导理论,得到了胶轮温度场理论模型。根据理论模型对胶轮温度场进行数值仿真计算,结果表明:胶轮进行周期性吸热和放热循环,在交替循环中温度不断升高;胶轮截面温升主要分布在接触表层,接触表层温度变化剧烈且分布不均匀;尼龙复合材料温升较聚氨酯低,随着速度的增加,两者的温差迅速增大。即尼龙复合材料具有更好的耐热性能,能有效降低胶轮的摩擦温升。In order to research the thermophysical properties and temperature field of Polyurethane （PU） and polyamide 1010 composite （PA1010 ＋ 20% PTFE ＋ 5% MoS2 ） which were employed as the rubber wheels of roller guide shoe in coal mine, thermo-analysis experiments were conducted on DSC-TG and LFA. The experiment results show that with the temperature increasing, the specific heat capacity increases rapidly, while the thermal diffusivity decreases exponentially, and the thermal conductivity almost keeps stable for both PU and PA composite. Moreover, thermal diffusivity and thermal conductivity of PA composite are obviously lower than those of PU. Based on the heat conduction theory and rubber wheel＇s working condition,the temperature field theoretical model of rubber wheel was established. By calculating the theoretical model, it is found that the rubber wheel experiences the periodical cycles of heat absorption and liberation, and the temperature increases gradually during this process. The temperature rise of the section of wheel mostly distributes on the surface layer where the temperature distributes nonuniformly and changes greatly. The temperature rise of PA composite is lower than that of PU, and the difference in temperature between PU and PA composite increases rapidly with the increasing of velocity. Therefore, PA composite is superior in heat-resistance, which can decrease the temperature rise of rubber wheel efficiently.

关 键 词：滚轮罐耳胶轮 动态热物性能 瞬态温度场 聚氨酯 尼龙复合材料 

分 类 号：TD534[矿业工程—矿山机电]