3 机械零件的使用寿命使用寿命是批量生产采煤机械的使用特征,取决于其使用载荷的实际工况。使用寿命可以按下式确定式中——考虑载荷实际工况的当量应力相同机械零件集合的当量应力数值有差别,是由因工况随机波动产生的使用因素易变性造成的。这是由于截煤阻抗、功率与速度变化引起的。 3 The life of mechanical parts Life is the characteristics of mass production coal mining machine, depending on the actual load conditions. The service life can be determined according to the following formula: Equivalent stress considering actual load conditions The same equivalent stress values ​​of a mechanical part assembly are caused by the variability of factors of use due to random fluctuation of working conditions. This is due to changes in coal resistance, power and speed.