装配间隙对连采机履带销失效形式的影响

Effect of assembly tolerance clearance on track pin failure of the continuous miner

以EML340连续采煤机履带销为研究对象,建立多组包含履带板和履带销的有限元模型,进行一系列有限元计算,考察同心装配和不同心装配两种工况下,装配间隙变化对履带销失效形式的影响。分析结果表明:不同心装配引起的偏载将加速履带销破坏;履带销最大应力随装配间隙增大而变大;间隙值增大后,履带销最大应力位置逐渐偏离剪切面;履带板销孔间隙值为2mm时,不同心装配最大应力值是同心装配时的1.5倍;履带销断裂形式属于疲劳破坏。

A finite element model of the track pin of continuous miner EML340 is established. The model is to investigate the effect of the change of assembly clearance on the failure mode of the track pin in two working conditions ： concentric and non-con- centric assembly. The analysis results show that the eccentric load caused by the non-concentric assembly accelerates failure of the track pin. The maximum stress of the track pin increases with the increase of the assembly clearances. The maximum stress position of the track pin is gradually deviated from the shear plane. As the assembly tolerance clearances value is 2mm,the maxi- mum stress is 1.5 times higher,and the fracture mode of the track pin belongs to fatigue failure.