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.
结合起重机吊臂的结构设计，从材料、箱形截面的形式及其腹板的局部稳定性等方面对伸缩臂进行了分析、计算。
With structural design of the hoist jib, analysis and calculation are made in such aspects as material, type of the box type section, and the local stability of the web plate.
本实用新型只需扳动一个开关，起重机吊臂的伸缩动作可自动连续完成。
The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.
该机的起升、变幅、回转、吊臂伸缩及支腿收放等机构，全部采用液压驱动。
The hoisting, derricking and slewing mechanism, the extension and contracting of booms, the setting down and back of outriggers, all are driven hydraulically.
在方舱上安装由液压系统控制的可升降伸缩旋转吊臂； 在吊臂顶端安装有可折叠吊篮。
A luffing extension-jib was installed on top of the carriage with a telescopic nacelle.
作业装置为两节四边形伸缩式工作臂和吊臂，专用于进集装箱石板材的吊装作业。
The handling equipment are Telescopic boom and Craner, it is expert to handle the stone-slab in container.
作业装置为两节四边形伸缩式工作臂和吊臂，专用于进集装箱石板材的吊装作业。
The handling equipment are Telescopic boom and Craner, it is expert to handle the stone-slab in container.
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