吊臂的伸缩是通过伸缩油缸和钢丝绳进行，各伸缩臂同步伸缩。
Telescoping of the boom is carried out through telescoping cylinder and steel cable, and all booms telescope simultaneously.
吊臂伸缩机构如下图所示。
箱形伸缩式吊臂的可靠性分析是铁路起重机设计中的重要部分。
The reliability analysis of the box type telescopic jib plays a key role in the railway crane design.
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