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目前,国内大型铸造起重机的起升机构根据减速器结构和布置形式的不同,一般分3种类型:第1类是起升机构的减速系统由3台减速器组成并呈品字形布置。其中中央减速器是行星齿轮减速器,其2个低速轴通过联轴器驱动2个普通圆柱齿轮减速器（以下简称行星齿轮减速器）;第2类的中央减速器为棘轮棘爪减速器;第3类是起升机构的减速器为长条形圆柱齿轮减速器。针对这3种减速器各自的特点和使用维护注意事项,作详细地介绍,以供起重机设计和使用者参考、借鉴。
At present, the hoisting mechanism of large-scale foundry cranes in China is generally divided into three types according to the structure and arrangement of the reducer: the first type is a hoisting mechanism decelerating system which is composed of three decelerators and is arranged in a character shape. One of the central reducer is a planetary gear reducer, the two low-speed shaft through the coupling drive two ordinary cylindrical gear reducer (hereinafter referred to as planetary gear reducer); the second category of the central reducer ratchet pawl reducer; The third category is the hoisting gear reducer for the long cylindrical gear reducer. For the three kinds of reducer their respective characteristics and the use of maintenance considerations, for a detailed introduction for crane design and user reference, reference.