Abstract: 　　　In order to ascertain the strength of lifting arms and then design a rational working mechanism for a multifunctional vehicle used in coal mine, using digital product software SolidWorks to design the three-dimensional model of the working mechanism., based on its stress states under statical loading working condition, using SolidWorks/COSMOS module making a finite-element analysis to its key parts lifting arms. According to these data analysis, consummating the structure design of the working mechanism, checking the strength, then getting the conclusion and put forward a improve scheme. This technique provides a theoretical basis for the working mechanism design.

Key words: Multifunctional Vehicle for Scraping and Carrying, Working mechanism, Lifting arms, Finite-element analysis