Because wearing and tribology problem in coal mine machinery exist universally, and they have a great influence on coal mine machinery just as what we see.

• 摩擦磨损问题在煤矿机械中普遍存在,对煤矿机械的使用和寿命产生很大影响,因此重视煤矿机械设计中的摩擦学设计非常必要。