Structural Analysis And Optimization For A Compound Booms Type Of Working Device Of The Garbage Truck

Hook-lift garbage truck is a kind of garbage transport vehicles which can self-load and unload garbage container and dump garbage by the hook-lift auto-loading device, so the structural property of the hook-lift auto-loading device is the key to the design of the vehicle. In order to improve the competitiveness of products, a domestic construction machinery group cooperates with Yan Shan University to design and develop a new compound booms type of hook-lift auto-loading device. This paper mainly takes the research work of structural analysis and optimization of the new device.This paper summarizes the purpose, the background and the usage of product development, then proposes the method and steps for structural analysis and optimization of the device: At first, we analyze the structure and the performance comparison of different structural forms of the device, then mathematical model of the vehicle for two kinds moving process of unload garbage container and dump garbage is formulated, so the variation of the devices’ s hinge force, the force of cylinder and the force of garbage container acting on the device during the two moving process can be obtained, which provides boundary condition of load for the subsequent structural analysis. Secondly, we establish parametric finite element model of the whole device, simplifying slider connection to reduce computation, and thus the structural analysis of the device during the whole moving process is achieved. Then, we extract the stress curve of key structural position during the whole moving process, from which we can find out the stress variation of the device during the whole moving process, and certify the dangerous cases. After that, we further analyze the stress of the device in the dangerous cases accurately by dealing the slider connection with contact analysis. Meantime, stress test experiment of the device in the dangerous cases is done. Within error permissibility, the experimental results verify the correctness of the finite element analysis. At last, in order to minimize the weight of the device, we use the parametric finite element model established to optimize plate thicknesses of the key components, under the condition of satisfying strength. The optimization results show that 7.41% weight reduction has been achieved for the device.The research of this paper provides a reliable calculation basis for the design and development of the new compound booms type of hook-lift auto-loading device, also offers a way for the application of the CAE technique in the mechanical design and development.