采煤机平滑靴平动固-热-力耦合特性分析

针对采煤机滑靴在推进过程中,平滑靴与刮板输送机中部槽间瞬态温度高导致接触面磨损甚至失效的问题,构建了煤粉界面层影响下动摩擦因数的平滑靴固-热-力耦合数学模型,再以试验获取的滑靴载荷作为输入,利用Comsol Multiphysics分别对干煤粉和含水煤粉界面影响下,采煤机前、后平滑靴与刮板输送机中部槽间的固-热-力耦合特性进行分析。结果表明:接触面间温度与滑靴受力、煤粉的状态有关,干煤粉界面下前后平滑靴的最高温度为460.04 K和433.73 K,最高温度位置在作用关节中心;含水煤粉界面下前后平滑靴的最高温度为438.31 K和418.62 K,最高温度位置同样位于作用关节中心。

Analysis of solid-thermal-mechanical coupling characteristics of shearer smooth boots

In view of the problem of wear and even failure of the contact surface caused by the high transient temperature between the smoothing shoe and the scraper during the advancement of the shearer sliding,a smooth friction-heating of the dynamic friction coefficient under the influence of the pulverized coal interface layer solid-thermo-mechanical coupling mathematical modelis constructed,and the sliding shoe load obtained from the experiment is used as an input,and Comsol Multiphysics was used to analyze the solid-thermal-mechanical coupling characteristics between the front and rear smoothing boots and the scraper under the influence of dry coal powder and water-containing coal powder interface respectively. The coupling characteristics were analyzed.The results show that the temperature between the contact surfaces is related to the force of the sliding shoes and the state of the pulverized coal. The maximum temperature of the front and rear smooth shoes under the dry pulverized coal interface is 460.04 K and 433.73 K,and the highest temperature position is at the center of the active joint;The highest temperature of the front and rear smooth boots under the pulverized coal interface is 438.31 K and 418.62 K,and the highest temperature position is also located at the center of the active joint.