The frame is made of longitudinal beams to accommodate three rope drums and the boom hoist.
框架由纵梁制成,可容纳三个绳筒和动臂葫芦。
奇趣工程百科
This Demag crane comes equipped with four hoist winches, a boom derrick with two winches, a boom hoist a luffing jib with two winches and a slewing mechanism.