Abstract
In view of the phenomenon that the excavator bucket is damaged before it reaches the theoretical life in the actual normal digging process. Based on the continuous trajectory theory, the three-segment continuous trajectory excavated alternately by bucket and rod is selected as the normal digging trajectory. The theoretical digging force (TDF) and limiting digging force (LDF) on the normal digging trajectory are calculated, compared, and analyzed. The influence of bucket structure strength and modal under two different digging force loads on normal excavation trajectory is analyzed. The constrained mode and free mode analysis of the bucket are carried out, and the modal analysis results are compared with the strength analysis results. The results show that on the selected normal digging trajectory, the LDF considering normal force and resistance moment is generally larger than the TDF, and the influence of the LDF load on the bucket structure strength is also larger. The results provide an explanation for the premature damage of the bucket in the process of normal digging.
Highlights
The dynamic characteristics and structural strength of the working device of the excavator have an important influence on the working efficiency of the excavator [1]
Comparing the differences of the factors to be considered in the two excavating force calculation models, we can see that the limiting digging force (LDF) is closer to the real excavating force than the theoretical digging force (TDF), and the normal force and resistance moment which are not considered in the TDF calculation model may be the important reasons for the damage of the key parts of the bucket
In this paper, aiming at the problem that the bucket is damaged before it reaches the theoretical life, a normal digging trajectory is selected according to the actual digging process of the excavator and the continuous trajectory theory. the changes of two different digging force loads in the normal digging trajectory are compared and analyzed, and the structural strength of the bucket is analyzed by taking the LDF as the external load
Summary
The dynamic characteristics and structural strength of the working device of the excavator have an important influence on the working efficiency of the excavator [1]. Zhang [5] based on the theoretical excavation force of the hydraulic cylinder, the static strength analysis and modal analysis of the whole tooling were carried out, and the multi-objective optimization of the working device was carried out by using NSGA-IIalgorithm. When analyzing the structural strength of the bucket, scholars usually take the excavating resistance or the theoretical excavating force (TDF) of the hydraulic cylinder as the load. STRENGTH ANALYSIS OF EXCAVATOR BUCKET BASED ON NORMAL DIGGING TRAJECTORY AND LIMITING DIGGING FORCE. A method for analyzing the dynamic strength characteristics of bucket structure based on normal continuous digging trajectory is proposed in this paper, and the LDF model considering normal resistance and resistance moment is used to calculate the load on the continuous digging trajectory. The constrained mode and free mode of the bucket are analyzed and compared with the results of strength analysis
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