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一、双起升机构和单顶滑轮 我们在以往的设计中,如QY16、QY25、QY32起重机均采用单起升机构。而起重机在工作时,常根据起重量和起升高度,或根据使用主臂还是副臂,来选择起升倍率。这样在从大倍率变为单倍率或由单倍率变为大倍率时,给工作带来不少麻烦。为此,在新的设计中,有必要采用主、副两套起升机构,其中副起升机构主要使用单倍率工作。如在使用副臂作业时,使用副起升机构,倍率为1,这样就省去了以往需要更换主起升机构倍率的工作。但是在主臂全伸状态下,起升倍率仍为单倍率,为了免去更换主起升机构倍率的麻烦,在主臂的头部安装了单顶
A double lifting mechanism and a single-pulley Our previous design, such as QY16, QY25, QY32 cranes are used single lift mechanism. The crane at work, often based on lifting capacity and lifting height, or according to the use of the main arm or jib, to choose the lifting rate. This change from large to single rate or single rate into a large rate, to work a lot of trouble. Therefore, in the new design, it is necessary to adopt the main and auxiliary two lifting mechanisms, of which the primary lifting mechanism mainly uses the single-rate working. Such as the use of jib operation, the use of deputy lifting mechanism, magnification of 1, thus eliminating the need to replace the previous master lifting mechanism magnification work. However, in the main arm extended state, the rise rate is still single rate, in order to replace the main lifting mechanism magnification of the trouble, the head arm installed in a single top