本文假定在吊臂自重作用下小车无爬坡,使吊臂跨内顶面近似保持水平为控制条件,来确定单吊点的位置;它与目前国内外产品吊点实际位置基本吻合。对双吊点吊臂,我们将吊臂自重转换成集中荷重,根据三种最不利工况产生最大弯矩相等的条件,给出双吊点的近似位置;它与国内外塔吊实际吊点位置相接近。 This paper assumes that under the action of the dead weight of the crane, the car does not climb, and the top of the boom is approximately maintained at the same level as the control condition, so as to determine the position of the single lifting point; and it basically agrees with the actual position of the product lifting point at home and abroad. For the double lifting point boom, we convert the dead weight of the boom into a concentrated load, and give the approximate position of the maximum lifting moment according to the three most unfavorable working conditions. It is in good agreement with the actual lifting points Close to