(接上期)回过头来再谈谈拉铲,与剥离铲最初由蒸汽铲放大而最终形成一种独特类型不同,拉铲最初几乎是与蒸汽铲同时由起重机发展而来,最初只是加装了特殊工作装置的起重机,与起重机不同的是,除了吊钩换成了铲斗外,还增加了一组拖拽铲斗的钢丝绳,使得铲斗增加了一个自由度,通过提升和拖拽这两组钢丝绳的复合动作,可以实现挖掘和卸料。 (Continued) Turning back to talk about the dragline, which, unlike the peeler shovel that was originally enlarged by the steam shovel to a unique type, was originally developed by a crane almost at the same time as the steam shovel, initially with the addition of The cranes for special work units differ from the cranes in that instead of the hook being replaced by a dipper, a group of wire ropes for dragging the dipper are added, giving the dipper an additional degree of freedom by lifting and dragging both Group of rope composite action, excavation and unloading can be achieved.