Structure Design And Finite Element Analysis Of Synchronous Lifting Device For Deep-well Intelligent Stereo Garage

With the continuous increasing of cars in city, parking has been highly concernedand an urgent problem to be solved for government. The development of city makesthe urban land much more precious, planning enough ground parking area to solve theparking problem is a dilemma. Thus developing underground parking space isundoubtedly an effective way to solve the problem.Deep-well stereo intelligent garage is an underground parking equipment withthe integration of optics, mechanics, electronics, hydraulics and computer science. Itsadvanced structure design and layout can make up for other current stereo garages’defects such as large area covering, high energy consumption, big noise, long time ofaccessing to cars, and hard to form garage groups. It can effectively solve thecontradiction between parking environment and urban planning. During thedevelopment and test run, there exists the dead halt phenomenon which is easilycaused by offset loading of the self-propelled lifting platform. It will seriously affectthe garage’s reliable operation and application.Aiming at the dead halt of PSC8CK-4ZT deep-well stereo intelligent garage,based on the welded structure’s optimization of platform truss and the effectivecontrol of the manufacturing and installation precision of lifting system, this paperfound out the main cause of the phenomenon, i.e. the hydraulic motor’s startingresistance was too large and output power far exceeded the factory setting value underoffset loading. Based on comparative analysis of current synchronous programs, usingthe innovative methods of transplanting and combining, this paper designed andmanufactured an anti-backlash rigid synchronous mechanism with the features ofsimple structure, fast response speed, good stability and high reliability. The liftingplatform’s maintainability was enhanced by further structure optimization, and its performance-weight ratio was improved by finite element optimization design. Thusmaking the deep-well stereo intelligent garage has high reliability, economy andmaintainability. This paper mainly includes the following specific contents.(1) Mechanical analysis of the self-propelled lifting platform was conducted,and its deformation was analyzed by finite element software ANSYS. And the weldedstructure of the truss was optimized to improve the stiffness and reduce the influenceof its deformation on dead halt phenomenon.(2) Pitch control rules was designed to control the assembly precision, and themagnetic right angle gradienter was used to control the rack’s installation accuracyand to ensure the accuracy, stability and load distribution uniformity of gear andrack’s meshing. In addition, the rack’s innovative locking plan was designed to avoidvibration, noise and accidents caused by the loose of rack. Thus the manufacturingand installation precision of lifting system were effectively controlled.(3) This paper conducted mechanical analysis under offset loading, pointed outthat the impact of truss deformation on the transmission was not enough to trigger thedead halt during the loading operation, and found out the root cause—the hydraulicmotor’s output power far exceeded the factory setting value under offset loading.(4) Based on the analysis of current synchronous devices’ applicability, thispaper designed and manufactured an anti-backlash rigid synchronous mechanismusing the innovative methods of transplanting and combining. Further structureoptimization and lightweight research were conducted to respectively enhance liftingplatform’s maintainability and performance-weight ratio.Deep-well intelligent stereo garage with the anti-backlash rigid synchronousmechanism has obtained a good synchronization effect, and effectively solved thedead halt problem. The study provides a theoretical support and technical solution forlifting platform’s synchronization problem.