Design And Analysis Of The Turnover Frame Of The Heavy Duty Vertical Dump Truck

The waste in the city has a direct impact on the quality of life of the citizens.As the urbanization in China expands rapidly,the urban population is increasing drastically and the generation of waste is also rising rapidly,which gives rise to a series of problems such as waste collection,transfer and disposal.Waste transfer is currently an essential part of urban waste treatment,while transfer trucks are the main tool for waste transportation and play a key role in dealing with urban waste problems.The research object of this project is the overturning frame of the vertical dump truck.Firstly,each mechanism and functional component of the overturning frame is designed so that it can complete the various tasks of loading and unloading the dumpster.Afterwards,the kinematics,dynamic characteristics and static characteristics of the overturning frame were analyzed by ADAMS virtual prototype technology and finite element method,on which basis the optimal design of key components was further completed,the main research contents are as follows:(1)Structural design of the overturning frame.According to the analysis of the workflow of the rubbish truck,the Hanma H6(HN3312A34CLM4)of Valin Heavy Truck was chosen as the chassis of the dump truck,and the lifting mechanism,lateral alignment mechanism,locking mechanism and sliding platform hook and loop mechanism were designed.The hydraulic lifting and sliding cylinders are selected by calculation,and a three-dimensional model of the overturning frame is developed.(2)Analysis of the kinematics and dynamics of the overturning frame.Through ADAMS software to derive the displacement velocity curves of key components in various conditions,in addition to extracting the force curves of the limiting rod,the overturning frame and the hydraulic cylinder,so as to derive the dangerous working conditions of the overturning frame and prepare for the static analysis.(3)Finite element analysis of the overturning frame.Firstly,the free modal analysis of the overturning frame is conducted to verify that the designed structure of the overturning frame meets the dynamic performance requirements;Then the dangerous working condition loads obtained from the dynamic simulation are applied to the key components to derive the total deformation and equivalent force clouds,to analyze the maximum stress and maximum total deformation,and to check the strength and stiffness of the components.(4)Structural optimization design.The restriction rod is selected as the object of dimensional optimization,and the optimized values of restriction rod diameter,reamed hole thickness and reamed hole diameter are obtained.After optimization,the minimum safety factor is nearly 2,while the maximum stress is reduced by 34.45%;then the topological optimization is performed on the lifting hydraulic cylinder support,so that its mass is reduced by 16% under the condition of satisfying the strength.