Analysis,Test And Optimization Design Method Of Wheel Loader's Front Frame

Loader is a typical large and wide construction machinery.It is widely used in roads,railways,ports,mining,construction,utilities,farmland capital construction and defense projects.The front frame is connected by pins,bolts and bearings with the work equipment assembly,the front axle and the rear frame.In addition to its support of the components,but also bear the vehicle and jobs generated in the dynamic load.Therefore,the front frame of the reliability is essential.This paper uses the methods of finite element analysis,prototype stress test and fatigue life test bench evaluation theory and combining the actual test,in order to explore the front frame fatigue strength under various working conditions and evolution mechanism,and based on the analysis of the results,the optimization design of the structure of the front frame,a front frame analysis,forming machine the test,the optimum design method of a wheel loader.Specific tasks include:The load analysis and calculation of the front frame based on the actual working conditions are completed.By analyzing the force condition of 6 typical working conditions,the working force of the working device and front wheel on the front frame is obtained under various typical working conditions;Pro/E software is used to build the front frame structure entity model and finite element analysis with Mechanica module with the former frame under 6 typical working conditions of the stress distribution,stress that partial load conditions of the largest joint operation;Through the overall analysis of the front frame in the typical operation conditions,the whole distributions of stress of the front frame were obtained in typical operation conditions.Then,according to the characteristics of the stress distribution,combined with market feedback fault information,glue the strain gauges to the weak parts of front frame to do the stress test,to verify the results of the finite element analysis.Then,combined with finite element analysis and stress test results,the front frame was optimized by Mechanica.Finally,we can use the fatigue life test bench to assess its fatigue life.According to the comparative analysis before and after the optimization of the front frame,we can increase the life of the final front from 4000 hours to 8000 hours,reduce weight 134.6kg,reduce the amount of welding 9.7%,and reduce the manufacturing cost.Based on the front frame of a wheel loader structural analysis and research,this paper has provided a reliable integrated design optimization method for the design of the loader frame.It helps to shorten the product design cycle,improve enterprise efficiency and performance products.