Comprehensive performance analysis of a shearer drum in a complicated seam based on discrete element method

Abstract

Drum of Shearer undertakes the main function of coal falling and loading, and its performance directly affects the working efficiency of the shearer. Therefore, in order to realize the analysis of the performance of the shearer drum, the MG2 × 55/250-BW shearer drum was the engineered object. Combining the physical and mechanical properties experiment results of coal samples, the coupling model of the drum cutting in complex coal seam was established using discrete element method. The falling-coal characteristics of the spiral drum were studied under different working conditions, and the falling-coal trajectories of the coal and rock particles were fitted. Based on a virtual prototype, the variations of the coal loading rate and lump coal rate with different design parameters were determined by studying the falling-coal effect and loading performance of the drum. Considering the drum performance, multi-objective optimization theory was used to determine the optimal operating and structural parameters. The results indicate that, in the process of drum cutting, the cutting depth has the most significant effect on the coal loading rate, while, the blade spiral angle has the least significant. Moreover, with the increase of the cutting depth of drum and the traction speed, the lump coal rate increases. While, with the increase of the drum rotation speed and the blade spiral angle, the lump coal rate decreases. It is found that when the cutting depth of the drum is 597 mm, the traction speed is 5.4 m/min, the drum rotation speed is 104.8 r/min, and the blade spiral angle is 12° the performance of the drum is optimal. Compared with the falling-coal trajectories before optimization, the displacements of the coal and rock particles ejected along the optimal falling-coal trajectories increase in the coal loading direction. The loading rate and lump coal rate of the drum increase by 6.05% and 12.27%, respectively. The load fluctuation of the drum decreases, and the productivity increases.

Retracted: Research on intelligent elevation control method of shearer drum based on deep learning

“…The price of freight increased by 6.05% and the price of stone by 12.27% respectively. Drum load fluctuations are reduced and productivity is increased [6]. Zhao, L. et al The shear drum plays an important role in removing and transporting coal, and its performance is believed to directly affect the performance of the shearer.…”

Influence of coal cowl parameters on the coal loading process of thin coal seam shearer drum

“…Subsequently, Tian et al 20 numerically probed into the influence of the factors such as the helical angle, rotation speed, haulage speed and cutting depth of the drum on the coal loading rate through DEM, and compared the simulation results with the in-situ test results, further confirming the effectiveness of DEM for the study of the drum’s loading performance. Zhao et al 21 numerically investigated the coal loading performance of the drum under the influence of multiple factors, and proved that the coal loading rate was influenced most by the cutting depth and least by the helical angle. Furthermore, they also provided the optimized structural and operational parameters of the drum.…”