Design and position precision analysis of helicoids pushing chain mechanism

Abstract

The helicoids pushing chain mechanism is a novel telescopic mechanism used to push target from one position to another rapidly. The structure of the telescopic mechanism is developed and the basic design criteria are given. The position precision of the pushing chain influenced by various factors is very important to accomplish the task of pushing target. The mathematical model of position precision under the static condition is established in order to forecast the final effects and achieve some desired results by the machining. The influence of each factor is obtained through the numerical simulation. Furthermore, the bended deformation of the extended chain is calculated using the mechanics of materials method. According to the influences and the bended deformations, an error compensation method for a certain pushing distance is proposed so as to improve the position precision of chain head and achieve a satisfactory shape of the extended part. This research provides theoretical and methodological guidance for controlling machining errors and manufacturing of the pushing chain.