Study on multibody contact load distribution characteristics of scraper conveying system of continuous miner

Understanding the interaction of scraper chain-sprocket-tail drum-chain path is of great significance to improve the transportation efficiency and service life of the intermediate scraper conveying system of fully mechanized excavation equipment. The dynamic characteristics of the internal tension, running resistance and multi-contact interface load of the scraper chain are the theoretical basis of the research. Firstly, a method for obtaining periodic cyclic dynamic load history is proposed, and then the model of single chain scraper conveyor for continuous shearer is constructed by using RecurDyn and simulation structure. Finally, the influence of parameters such as conveying inclination angle and running speed of sleeve scraper chain on the reliable operation of conveying system is determined. The results show that when the conveying angle is 12 °, the scraper conveying system runs stably and the impact between multi-rigid bodies is small. As the chain speed increases from 0.85 m / s to 2.4 m / s, the wear of the conveying system gradually increases, and the contact load distribution of the upper chain plate 2, the upper chain plate 3 and the lower chain plate 3 is seriously worn.