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吊臂是起重机的重要组成部分,吊臂系统结构可分为两大类:一类是轮胎式起重机常用的以液压缸为伸缩动力的箱形伸缩吊臂,另一类是采用角钢或钢管制成的桁架式吊臂。箱形伸缩吊臂要求质量轻,能抗弯,形状以椭圆或方形为常见。桁架式吊臂不但要求其能抗拉、抗弯,而且结构上还要运输方便,近几年产的桁架式吊臂运输时可以相互套在里面。
Crane boom is an important part of the crane structure of the boom system can be divided into two categories: one is commonly used in tire cranes hydraulic telescopic cylinder telescopic boom, the other is the use of angle or steel control Into the truss-type boom. Box telescopic boom requires light weight, can be resistant to bending, the shape of an ellipse or square is common. Truss boom not only requires it to tensile, bending, but also the structure is also easy to transport, in recent years the production of truss-type boom transport can be set in each other inside.