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Car lift is the equipment to facilitate worker’s operation, lifting a car to a certain appropriate height according to the maintenance condition, which plays a very important part in the auto-maintenance industry. Auto-maintenance industry demands car lift higher and higher with the continuous development of the auto industry and the diversity of the auto type. Traditional lift has defects such as limited carrying capacity,requiring fixed installation, low lifting height, poor flexibility,and mainly used in the small or medium-sized vehicle maintenance, therefore it can’t satisfy the development of the auto maintenance.This topic is financially supported by the project of Guangzhou Gao Chang Hydraulic Technology Co., Ltd. Research and Industrialization of Combined Portable Hydraulic Column Lift for Heavy Vehicles. This paper plans to research and develop a kind of hydraulic lift which can be mobile operated,working indoor and outdoor,used for maintaining heavy vehicles. This equipment has advantages such as novel structure, high carrying capacity, sturdy and durable, mobile flexible, convenient operation, safe and reliable operation. The main research contents are as follows:Firstly, the development history of lift, classification feature are analyzed detailed in the paper. The trend of lift is summarized as: high safety, the rapidity, high dimensional utilization rate and energy saving. The main factors which affect lift’s properties are researched: manufacturing process, insurance device and mechanical synchronizing device.Secondly, based on the lift’s work principle and performance requirements of heavy lift, the design requirements of lift on structure,hydraulic and control system are studied,and the structure model of lift is designed with the help of Solidworks software; lift’s parts modeling, virtual assembly and interference checking are completed as well.Thirdly, this paper researches lift’s movement and requirements for hydraulic system, designs hydraulic system drawing, selects hydraulic cylinder, hydraulic pump, key hydraulic parts and related auxiliary parts. At last, checks performance of hydraulic system designed . Fourthly, static analysis of the lift platform structure and its key components are carried on with ANSYS Workbench. The result shows that bracket arms are the most dangerous parts.Finally, Design Exploration optimization module of ANSYS Workbench is used to carry on size optimization analysis to supporting shaft, optimization parameters are: diameter DS_D 38mm、length DS_L 222mm. According to the problems appear in the finite element analysis of bracket arms, improvements are carried on material selection and shape structure optimization, the best design results are as follows: thickness T of upper board of bracket arms is 13mm, length D1 of traverse board of bracket is 905mm.
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