提高塔机的起重性能是塔机设计中需要考虑的重要问题。由于变幅小车和吊钩滑轮组的重量直接作用在起重臂上,所以其对起重性能的影响不容忽视。特别是目前我国制订的塔机新系列中,基本臂最大幅度值普遍提高,而在实际使用中还有要求增加臂长的趋势。 Raising the tower crane’s lifting performance is an important issue to be considered in the tower crane design. Since the weight of the luffing trolley and the hook pulley block directly act on the jib, its influence on lifting performance cannot be ignored. Especially in the current new series of tower cranes developed by China, the maximum amplitude of the basic arm is generally increased. In actual use, there is a tendency to increase the arm length.