Designing And Optimization Of Trolley-frame-based Reducer Of Teeming Crane

As one kind of high risk operation bridge crane,safety and light weight are importantfactors in the detailing of the teeming crane.The role of reducer is to transfer torque and speed from motor to the hoisting mechanism.The characteristic of trolley-frame-based reducer for main hoist mechanism is that the lower housing of the gearbox is welded with the trolley frame.In the designing of such kind reducer,the rigidity of the housing as well as its dimensions and weightiness should be taken into consideration.In this thesis,the study of designing and optimization of trolley-frame-based reducer for teeming crane is conducted.Firstly,the overall design and function parameters are determinedaccording to the operation condition and layout of the hoisting mechanism of the teeming crane.Secondly,3D parameter and mechanical model of the reducer is established.To verify the reliability,finite element method(FEM)is used to analyze the strain and stress of the key parts as well as the overall model.Finally,based on the FEM results of the initial model,the structure optimization of the trolley frame,especially the thickness of the cover plates and the webs,is conducted.With the method of iterative optimal algorithm,in which constrains are set and variable parameters are modified,the optimal solution of the objectivefunction is got.According to the computation,the total weight of the trolley frame is reduced by 13.1% without affecting gear mesh.The aim of reducing material needs and leaving a greater room to play for the follow-up lightweight design is achieved.