Tian Zhen, Gao Shan, Ma Lianwei, Wang He, Ge Yang
College of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou, 466000, China.
Mechanical Engineering, Liaoning Technical University, Fuxin, 123000, China.
Sci Rep. 2025 Jan 7;15(1):1048. doi: 10.1038/s41598-024-84862-7.
In order to study the movement characteristics of coal particles in the coal loading process of spiral drums, the spiral drum of a certain type of shearer was taken as the research object, and the intrinsic parameters of the materials were calibrated through the determination results of coal sample properties, the relevant parameters of coal particle adhesion were determined, and a discrete element model of spiral drum coal loading was established. The distribution of coal particle movement subsequent to the fracture of the coal wall was derived through simulation. By spatially dividing the envelope region of the spiral drum along the radial and axial directions, the number and velocity distribution of coal particles in different envelope regions were obtained. The study revealed that the number of coal particles in radial regions III and IV was significantly higher than that in regions I and II. Most of the coal particles in regions III and IV moved outward along the drum axis under the action of the spiral blades, while a small portion moved from regions III and IV towards regions I and II. The coal particles in the axial region near the outer side of the coal wall have a strong ability to flow towards the scraper conveyor, and the probability of coal particles being thrown towards the rear of the spiral drum is higher in the region near the end plate. The increase in traction speed has little effect on the velocity of coal particles in all directions within the envelope region, while the increase of drum rotation speed can significantly improve the velocity of coal particles in each region. Through statistical analysis, it was found that the coal loading rate decreases with the increasing of traction speed. As the drum speed increases, the coal loading rate first increases and then decreases. By comparing the results of industrial experiments and numerical simulations underground, the accuracy of the discrete element method used in this paper to analyze the particle motion in the envelope region of the spiral drum has been confirmed. The research results provide reference for the selection of motion parameters of coal shearer and the improving of coal loading efficiency of spiral drums.
为了研究螺旋滚筒装煤过程中煤颗粒的运动特性，以某型号采煤机的螺旋滚筒为研究对象，通过煤样特性测定结果对物料的本征参数进行标定，确定了煤颗粒黏附的相关参数，建立了螺旋滚筒装煤的离散元模型。通过模拟得出煤壁破碎后煤颗粒的运动分布情况。沿螺旋滚筒包络区域的径向和轴向进行空间划分，得到不同包络区域内煤颗粒的数量和速度分布。研究表明，径向区域Ⅲ和Ⅳ内的煤颗粒数量明显高于区域Ⅰ和Ⅱ。区域Ⅲ和Ⅳ内的大部分煤颗粒在螺旋叶片作用下沿滚筒轴线向外运动，一小部分从区域Ⅲ和Ⅳ向区域Ⅰ和Ⅱ运动。煤壁外侧附近轴向区域的煤颗粒向刮板输送机流动的能力较强，靠近端盘区域的煤颗粒被抛向螺旋滚筒后方的概率较高。牵引速度的增加对包络区域内各方向煤颗粒的速度影响较小，而滚筒转速的增加能显著提高各区域煤颗粒的速度。通过统计分析发现，装煤率随牵引速度的增加而降低。随着滚筒转速的增加，装煤率先增加后降低。通过对比井下工业试验和数值模拟结果，验证了本文采用的离散元方法分析螺旋滚筒包络区域内颗粒运动的准确性。研究结果为采煤机运动参数的选择及螺旋滚筒装煤效率的提高提供了参考。
