垂直起吊机构的设计（有CAD图纸）.pdf

() : II Abstract Lifting is an intermittent job of materials lifting way down and horizontally moving handling machinery. Lifting operations are usually repeated cycles, a complete operating cycle generally includes extracts lifting, translation, down, unloading and other links. Often starting, braking, forward and backward movement is the basic characteristics of lifting machinery. In recent years, with the rapid growth of Chinas fixed asset investment, we continue to be launched infrastructure and large-scale projects, so that Chinas construction machinery industry achieved unprecedented development, but also by the people more and more attention. Our lifting machine manufacturer compared to European and American competitors in technology, there are still gaps in the industrial chain, product structure there are also some disadvantages, but it is achievable. More important it is that China has never given up in this area of independent research and development, and already has a fairly large industrial scale, created several world renowned brands. The main cont