一、液压起重臂的发展概况瑞典木材装卸作业中,广泛使用液压起重臂,在三十年代木材是靠人力装车。四十年代末及五十年代初期,开始利用简易绞盘机将木材提升起来,直到五十年代末期才开始着手研究设计新型的液压起重 First, the development overview of the hydraulic boom Swedish timber handling operations, the extensive use of hydraulic jib, in the thirties timber is manpower loading. In the late 1940s and early 1950s, wood was raised using a simple winch until the late 1950s when it began to study the design of new hydraulic hoists