Optimal Design Of Hinge Points On The Working Device Based On The210Type Excavator

Hydraulic excavator as a commonly used and important construction machinery, andit is widely used in the civil construction, mining, water conservancy and hydropowerengineering, military vehicles field. Working mechanism is the main part for earthexcavation, so the performance and reliability of working mechanism become theimportant symbol of machine. The work of the mechanism is completed by compoundaction of three cylinders and the interaction of earth moving, of which the movement andforce analysis is quite complex. In practical application, arm crack, unreasonableexcavation region, machine intervene and early failures of hinge often occur, which resultin tremendous loss and directly influence the development of domestic excavator filed.Compared with other foreign engineering machine, domestic hydraulic excavator is lack ofcompetitiveness and has the lower share in domestic market. Optimization of workingmechanism is vital to the design of a hydraulic excavator, which is able to improve thewhole machine’s working efficiency and reliability.The main research and related conclusion are as followed. Firstly, a multi-bodydynamics model and finite element model of excavator working device is established, thenstrength analysis of the main part of the work unit is made. Secondly, in order to solve theproblem of the strength of the swing arm of excavator and achieve the goal of thelightweight, DOE analysis method is introduced into the positional parameter optimizationprocess of the hinge point of excavator for the first time, then combination methods oforthogonal experiment design and topology optimization are used respectively to optimizethe position and structure of the hinge point. Thus optimum design of210excavatorworking device is finalized.The results showed that combined DOE analysis and topology optimization methodfor the optimization of the hinge point of the working device is feasible.The arm stressdecreased by21%, it successfully solved the problem of insufficient strength of the boom of210excavator. Secondly, by the topology optimization of the hinge structure, thecentral shaft seat weight was28.6%lower than the original structure, as well as completedthe work of reducing the weight of the working unite to some extent. Here show some ofits practical significance.