Multiple Parameters Optimization Design Method Research On Arms Of The Input Configuration Between Arms Of SLM

Scissor Lift Mechanism(SLM) is a common rigid lifting mechanism, and it has generally the following traits: simple and compact structure, large capacity, stable operation, good maneuverability and low lifting itinerary, etc., widely used in airport ground support equipment. As a kind of common parts of airport ground support equipment, SLM is assembled in airport special equipment, with its own load lifting action for realizing the docking of equipment with aircraft cabin door, completing the scheduled tasks of equipment.Its safety performance directly affects the safe operation of the airport and the plane, which can cause certain influence on the development of Chinese civil aviation industry. Between arms is one kind of the input configurations of SLM and it has the advantages of compact structure, easy to decorate and larger stroke. So this input configuration has been widely applied in SLM with a narrow layout space for power plant and multistage lifting machine. In this paper, we take this configuration as the research object.In this paper, the model of between arms of SLM is given and its mechanics analysis is made for solving the key node force and internal force of arms, the stress field model in all parts of arm is established according to the fourth strength theory. Then taking the maximum stress suffered by arms in the whole operation process of SLM as the optimization goal to optimize the input location parameter. The purpose is to obtain the optimal parameter values making the maximum stress minimum. Accordingly based on the equal-strength principle,this paper puts forward optimization design process with time-varying characteristics for arms and an arms’ model with ideal time-varying cross-section are setting up. On this base, a series of simplified solutions have been derived. Finally, using the finite element software for simulation and checking calculation about the theoretical calculation of key components of SLM. In this paper, the optimization design method is to SLM’s arms, but its optimization idea has universality, can be extended to the optimization design of other mechanical.