Mechanical Properties Analysis And Experiment Research On Lightweight Hoisting Mechanism Of Bridge Crane

As the main equipment in hoisting machinery,bridge crane has played an significant role as the main role in hoisting machinery.The domestic bridge crane mostly adopts the former Soviet Union design form,it has heavy structure,large outline dimension and high energy consumption,lightweight design on which has been the challenges and tasks in lifting transportation.Therefore,it is of great significance to conduct lightweight layout design,support scheme design and mechanical properties analysis to lightweight design on hoisting mechanism.For lifting capacity of 32 t and three-point integrated layout on hoisting mechanism of bridge crane,using theoretical analysis,numerical calculation and experiment analysis to conduct relevant research,the main research contents are as follows:1.Through the analysis of the lightweight layout trend on hoisting mechanism,and the three-point integrated layout is proposed,basic mechanics analysis is conducted on the new layout,combined with mechanical properties analysis on different support and connection scheme,the four supporting schemes based on typical strutting position and strut members are put forward.Specially,static analysis on lightweight mechanism are conducted in different supporting ways through finite element methods,results shows that the strutting member in the input end on hoisting mechanism has great effects on the total deformation,while the strutting member in the output end has great effects on the equivalent stress,which would lay theoretical foundation of the optimal supporting scheme.2.The stress and strain of reducer are chosen as optimization objective,mechanical properties are analyzed for lightweight hoisting mechanism in support,and based on the mechanical analysis of the stress and deformation in the input and output end of reducer,the optimization design was conducted through the combined methods of the response surface methodology and multi-objective optimization methods,results showed that the maximum deformation and the maximum stress are related to the strutting position of the two pivots of reducer,the maximum deformation would become smaller when the distance between the strutting member in the input end and gearbox is closer,and the maximum stress would reach a minimal value when the distance between the strutting member in the output end and gearbox is 40 mm,which would lay essential foreshadowing for further structure optimization on lightweight mechanism.3.Applied lightweight mechanism after optimization to static analysis and dynamiccharacteristics analysis,the weak points of stress and deformation of whole mechanism are obtained,dynamic response analysis is conducted on the weak points,results verified the stability and reliability on lightweight hoisting mechanism.4.Experiment platform of the new layout is established and tested,test results of the stress variation trend are consistent with FEM results,the error of specific stress value between them is in the allowable range,which proved the correctness of the finite element calculation and laid theoretical foundation for sequential lightweight design of crane.