Humanoid climb assisting unit (HCAU) is a key mechanism for the lift platform to adjust its height-level of the space launch site. It is widely used for lift platforms of launch towers, service towers, vertical assembly test building for launch vehicles and that of silos for missiles. In this paper, its working principal is illustrated. The design requirements and terms, design steps and effecting factors are discussed. Three types of HCAU design methods and their calculating formulae are derived. Design examples are presented.
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