最近十年来,带伸缩臂的自行式起重机在国内外发展很快。液压伸缩臂的采用缩短了起重机的辅助工作时间,改善了操作者的劳动条件。这种起重机可以根据需要变化臂长,改变起升高度和作业幅度。它不仅能够用于建筑工地做安装工作;也可以在固定的桁架式吊臂使用受限制的场合下,方便地出入于货场、仓 In the last ten years, self-propelled cranes with telescopic boom have developed rapidly at home and abroad. The use of hydraulic telescopic arms shortens the crane’s auxiliary working time and improves the operator’s working conditions. This kind of crane can change the length of the arm according to the need, change the lifting height and the working range. It can not only be used for construction work on the construction site; it can also be easily accessed to the freight yard and warehouse under the limited use of fixed truss booms.