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目前中小吨位液压汽车起重机,起重臂多采用薄壁箱形结构,油缸变幅。在起重作业时,起重臂在两个方向承受压缩和弯曲的联合
At present, the small and medium-tonnage hydraulic truck cranes adopt a thin-walled box-shaped structure for the boom, and the amplitude of the cylinder changes. In lifting operations, the boom is subjected to a combination of compression and bending in both directions