Abstract In order to study properties and characteristics of random loading on a mining backhoe loader-bucket during scooping granular coal and rock, the load on bucket was regarded as the resistance superposition of tangential, normal and lateral through reasonable assumptions and simplification. Normal resistance model of bucket was established by using Weibull distribution and deterministic analysis. Lateral resistance model was established by using the two-parameter method. Tangential resistance model was established by using joint distribution and random signal method. Taking a domestic underground mining loader as the research object, random loads of bucket were obtained by using MATLAB when the bucket cut in granular coal and rock, and the characteristics of random loads were analyzed. The results showed that the loads were obviously random and volatile, and the position of cutting angle of each resistance was different when they reached the maximum resistance. As the loader excavating arm working forward, the normal resistance reached its maximum value of 5.7×106 N when the cutting angle was 2.5628° but the lateral resistance had no obvious rule. The tangential resistance reached its maximum value of 2.8×106 N when the cutting angle was 39.950°. The maximum of normal resistance was 2 times the maximum of tangential resistance. The cutting load reached its maximum value of 5.9×106 N when cutting angle was 22.628°. The study provides a method of determining loads of the mining backhoe loader-bucket and lays the foundation for analyzing its working conditions.
LI Xiao-huo,SHI Zheng-rong,LüLiang-yu,WU Yun. Simulation of random loads for mining backhoe loader-bucket during scooping granular coal and rock. Chinese Journal of Engineering Design, 2014, 21(4): 329-333.
