Experimental study on the friction and wear of the scraper and groove side friction pair under variable factors

Abstract

To investigate the wear characteristics and mechanisms of the scraper and groove side friction pair under various factors, this study utilizes the scraper conveyor SGZ1000/2 × 1200 as the prototype and designs a test bench with a similarity ratio of 1:6. The Plackett–Burman experiment is used to examine the significant effects of five key factors (running speed, normal load, particle size, gangue content, and groove side clearance) on the groove side wear. It reveals that gangue content exerts the most significant impact, while the normal load is relatively minor. The interaction between factors is studied through the Box–Behnken experimental design. By analyzing the interaction through the obtained second-order regression model, it can be concluded that the interaction between running speed and groove side clearance, as well as the interaction between running speed and particle size, exacerbates groove side wear. The significant factors are validated through single-factor experiments. To further analyze the variations in wear under each factor, the changes from the second to the fourth level of each single factor are selected and compared with other factors. The running speed increasing from 0.06 m/s to 0.12 m/s results in a 102.67% wear amount increase. A 95.21% increase occurs when the particle size increases from 1.5 mm to 2.5 mm. Gangue content exhibits the most significant impact, where the content increases from 8% to 25%, marking a 205.73% rise. The wear morphology shifts from shallow pits and furrows to deeper ones, accompanied by a noticeable increase in quantity. Conversely, the wear amount and morphology changes least in groove side clearance, when the groove side clearance increases from 0 mm to +1 mm, a decline of 63.47%. The morphology shifts from numerous deep pits and furrows to shallower and smaller ones, indicating the mildest abrasive wear phenomenon.