Analysis of wear performance of loose coal material inmiddle groove of coal falling area

In order to study the impact wear characteristics of the coal material in the coal-slurry area to the middle groove of the scraper conveyor, improve the the middle groove of the scraper conveyor, and strengthen the key part, the corresponding theory for the selection of wear-resistant materials was provided. The scraper conveyor is responsible for the important task of loose coal transportation. The central trough is the key component of the scraper conveyor. The lignite, anthracite and coking coal are used to theoretically analyze the friction characteristics of the middle groove under the impact of coal materials, combined with EDEM software. The simulation model of the middle groove friction pair was established, and the middle groove force and line wear depth curves of the middle groove of the falling coal area under different structural forms and different coal bulk parameters were obtained. Different structural forms mainly include chain spacing and scraper distance. Under the same middle groove width, base particle size, running speed and coal material, the wear and stress of the chain spacing at 118, 158 and 188 mm were analyzed. And the wear performance characteristics when the scraper distance was 720, 864, 1 000 mm were also analyzed. Different coal parameters including particle size and different types of coal materials were analyzed at 0.8 times particle size, single particle size and 1.2 times under the same middle groove width, chain spacing, scraper distance, and running speed. By examining the physical properties of the three kinds of coal materials, the effects of different kinds of coal materials on the wear of the middle groove were investigated. The results show that after the stable transportation of coal materials, the loose coal in the coal-removing area gathered near the scraper, and the wear mainly occured in the chain; with the increase of chain spacing and scraper distance and the increase of the coal particle size, the wear of the middle groove also increased; the impact and wear of anthraciteon the middle groove in the coal-removing area was greater than lignite and coking coal.