Analysis of bucket structure characteristics based on different working loads
REN Zhi-gui1,2, SUN Hao-ran1,WANG Jun-li1,2, LIU Ju-rong1, ZHU Hao-jie1
（1.School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, China;
2.Shaanxi Key Laboratory of Industrial Automation, Hanzhong 723001, China）
Abstract: Aiming at the problem that the bucket suffers from serious wear or fracture before it reaches the theoretical life, the influence of composite excavation method on the structural characteristics of bucket was studied. Based on the stress characteristics of the working device, four typical working conditions of excavators were selected. The different working loads of a 21T excavator was calculated respectively based on the empirical formula of excavating resistance, the excavating force model of individual excavating theory and the excavating force model of compound excavating theory. The finite element method was used to calculate stress and deformation under different loading conditions. The results indicate that: under the same condition, the compoud digging pattern corresponds to a larger external load of the bucket, it also corresponds to greater stress and deformation. This result verifies the conclusion that compound digging is an important factor causing bucket damage, it provides theoretical basis for strength analysis and optimization design of excavator bucket structure.
Key words: excavator; bucket structure; working loads; compound digging force