Optimization of Coal Mining Machine Drum Structure and Microscopic Analysis of Coal Particle Flow

To solve the problems of low loading performance and insufficient design of the drum of thin-seam coal mining machine, this paper proposes an innovative coal-guiding drum design and systematically investigates the effects of different designs on the trajectory, flow structure, and loading efficiency of the coal particles from both macro- and microscopic perspectives. At the macroscopic level, the optimized design significantly improves the coal loading efficiency of coal particles by adding circular arc-shaped coal guide plate and triangular coal guide plate. Simulation experiments show that the average mass flow rate of the coal-guided drum is increased by 14.1%, and the mass flow rate under high load conditions is increased by 9.1%; with the increase of the rotational speed, the maximum increase of the loading efficiency is 16.96%. At the microscopic level, the optimized design changed the movement direction of coal particles, which led to a 15.85% increase in axial velocity and optimized the flow structure of coal particles. This paper provides a new theoretical basis and technical solution for improving the loading efficiency of thin-seam coal-mining machine, which has important practical significance and wide application potential.