Telescoping of the boom is carried out through telescoping cylinder and steel cable, and all booms telescope simultaneously.
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。
Single cylinder plus wire ropes, synchronous telescoping.
单缸加绳排，同步伸缩方式。
The structure of the derrick is triple-section telescoping structure, substructure is parallelogram structure, can be lifted by hydraulic cylinder.
井架采用三节伸缩式结构，底座采用平行四边形结构，能用液缸整体起升。
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