FEM Analysis Of Platform And Simulation Of Slewing Hydraulic System On Excavator

In recent years, small hydraulic excavators play an important role in construction machinery with the rapid development of industry. The requirement for both the quantity and the performance of excavator has become increasingly higher. At present, people usually design hydraulic system of crawler crane by experience and analogy, and then find problems after the prototype machine test in the domestic manufactories. It not only costs much time and energy but also contains enormous economy risk. The structural strength analysis of excavators with finite element method is an important way to improve the quality of design. Slewing mechanism is one of the most important mechanisms for crawler crane, of which dynamic characteristics affect the working performance of whole machine directly.After systematic analysis and research on the background of the subject-PZ70 small hydraulic excavator, which is developed by Push Heavy Machinery Limited Company, we mainly made the study as follow:(1) Accomplishing the design of rotary platform of small hydraulic excavators and the assembly of three dimension model on the basis of UG.(2) The rotating platform is researched, by precise analyzing of force in two different situations. Improvement suggestions for structure of platform are advanced according to the results of FEM analysis.(3) Based on the research on dynamic behaviors of prototype, the simulation model of slewing hydraulic system is build using AMESim software and its correctness is validated through the experiment.(4) Major factors which affect the slewing hydraulic system are analyzed by simulation. In order to reduce the impact of rotary brake, slewing hydraulic system is improved and analyzed by simulation.In summary, this paper presents a complete FEM model of platform and dynamic simulation of slewing hydraulic system on excavator. All research results not only play an important theory-instructing role in improvement, optimization and design of platform and slewing hydraulic system, but also have a good chance to be applied in practical design.