轻便起重臂是一种附设于脚手架的垂直起重机,最大起重量为0.5吨,可用于砖混结构房屋施工的垂直运输,也可作为大型吊装机械的补充。它的优点是,移动灵活,拆装方便,制作简单,成本低廉。轻便起重臂由三角架、支座、滑轮、卷扬机、钢丝绳、吊钩和承物架组成。构造见图1。三角架的各杆件尺寸可根据实际情况确定。各杆件尺寸变化,内力也发生变化。内力分析见图2: The lightweight lifting arm is a vertical crane attached to a scaffold. The maximum lifting capacity is 0.5 tons. It can be used for vertical transportation in the construction of masonry concrete structures, and can also be used as a supplement to large-scale lifting machinery. Its advantages are: flexible movement, convenient disassembly and assembly, simple production and low cost. The portable lifting arm consists of a tripod, a bearing, a pulley, a hoist, a wire rope, a hook and a shelf. The structure is shown in Figure 1. The dimensions of each pole of the tripod can be determined according to actual conditions. As the dimensions of each member change, so does the internal force. The internal force analysis is shown in Figure 2: