Study on Contact Characteristics of Chain Track Interface and Distribution Law of Coal Bulk Material of Short-distance Scraper Conveyor

Understanding the friction and wear law of the chain-track interface during the continuous transportation of coal particles by the short-distance scraper conveyor is of great significance for improving the reliability and fault warning capability of the scraper conveyor system of roadway boring equipment. Firstly, the rigid-dissipative coupling model of a short-distance scraper conveyor is constructed. Then, for the accumulation of coal bulk material in the position near the shovel star wheel and the middle of the chain track on the conveying chute, the specific inclination angle of the conveyor is 12°. The scraper chain speed is taken to be 1.32 m/s, 1.72 m/s, and 2.4 m/s, respectively for the combination, which is classified into six working conditions for the study. Finally, the main distribution areas, magnitude sizes, and causes of wear of the upper chain track and scraper chain were obtained, and the coal bulk particle transport characteristics and the relative velocity distribution law of material flow were elucidated. The results show that with the chain speed of 2.4 m/s, a scraper chain can be a smooth transportation of coal bulk material to the end of the machine, and the wear on the chain track on the chain plate is lighter.