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轮式起重机在产品自身重量相同的情况下,减轻伸缩起重臂的重量是提高起重性能参数最有效的方法之一。据大量的起重机折臂事故统计分析,由伸缩臂腹板局部屈曲失稳造成的事故占大多数。为满足产品向大起重量和高起升高度方向发展的需要,在尽可能降低起重臂重量的前提下,采用何种截面形式,才能将失稳减小到满足设计要求的最小程度,是设计者要解决的重要问题。针对轮式起重机箱型起重臂的抗屈曲失稳能力问题,采用有限元分析方法,取起重臂截面半波长段作为分析对象,对相同工况不同截面形状的起重臂的屈曲失稳情况进行分析研究,相对于起重机设计规范(GB3811-83)给出的取一块板进行屈曲计算要快捷、准确得多,而且也容易完成对复杂形状截面的计算分析。通过计算比较得出:在起重臂重量不增加的情况下,多边形起重臂抗屈曲失稳能力大于目前应用最多的六边形起重臂。
Wheeled cranes reduce the weight of the telescopic boom when the product is of the same weight as one of the most effective ways to improve lifting performance parameters. According to a large number of crane arm accident statistics and analysis, by the telescopic web buckling local buckling caused by the majority of accidents. In order to meet the needs of product development in the direction of great lifting capacity and lifting height, what kind of cross-sectional form should be adopted in order to reduce the weight of the boom as far as possible to meet the minimum design requirements? The designer must solve the important problem. Aiming at the buckling instability problem of the wheeled boom crane, the finite element analysis method is used to take the half-length section of the boom section as the analysis object. The buckling instability of the boom with different cross-sections in the same working condition It is quick and accurate to calculate the buckling of a plate relative to the crane design code (GB3811-83), and it is also easy to calculate and analyze the cross section of complex shape. Through calculation and comparison, it is concluded that the buckling instability of polygonal boom is larger than that of hexagon boom, which is the most widely used at present, in the condition that the weight of boom is not increased.