Numerical simulation on coal loading process of shearer drum based on discrete element method

Tian, Zhen; Jing, Shuangxi; Zhao, Lijuan; Liu, Wei; Gao, Shan

doi:10.1177/01445987211013536

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…According to Hertz-Medlin bonding theory [30,31], coal and rock particles are connected by bonds, as shown in Fig 1 . The bonding model can transmit forces and moments between contacting particles. The force includes normal and tangential forces, and the moment includes normal and tangential moments, which are calculated via Eqs (1)-( 4).…”

Section: Discrete Element Theory Analysismentioning

confidence: 99%

Numerical study of forces acting on the drum cutting coal with gangue

Liu,

Zhang

2024

PLoS ONE

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A coal model containing gangue was established by discrete elements to study the forces occurring when a shearer cuts coal, and a rigid-flexible coupled shearer section model was established in RecurDyn; the drum cutting process was simulated through bidirectional coupling. The dynamic distribution of the force chain was obtained when cutter teeth cut the coal rock. During the cutting process, the coal rock failure is caused by normal and tangential forces, with the latter having a major role. The ratio of the average tangential force to normal force was 1.34~1.79. When the rock is in the middle of the coal seam, the force (including normal and tangential forces) on the rock is the highest. Moreover, the force on the rock-coal interface is greater than that on the coal-rock interface. The results show that the force on the coal decreases with the increases in rotation speed. In contrast, the number of broken bonds increases. Further, the number of broken bonds and the force of coal increased nonlinearly with traction speed. Finally, the increase of tooth mounting angle decreased the force on the coal rock and the number of broken bonds, followed by an increase. As such, this study provides a reference for further theoretical research on forces in coal cutting.

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Section: Discrete Element Theory Analysismentioning

confidence: 99%

Numerical study of forces acting on the drum cutting coal with gangue

Liu,

Zhang

2024

PLoS ONE

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“…Meanwhile, he further studied the influence of the position relationship of the three machines in the fully mechanized mining face on the coal loading performance of the 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.…”

Section: Introductionmentioning

confidence: 96%

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

Xu,

Zhang,

Gao

et al. 2024

Sci Rep

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The low loading rate of the thin coal seam shearer drum is a severe obstacle to the efficient mining of thin seam resources, and the auxiliary drum loading through the cowl is an effective measure to alleviate this situation. However, the working mechanism of the coal cowl still remains unclear. In this paper, with the help of the discrete element method and the modeling experiment method, the effects of coal cowl’s offset distance, tilt angle and wrap angle on the coal loading rate under different loading modes of the drum are investigated; and the significance of various factors and their interactions to the drum coal loading rate is explored by designing response surface experiments. The findings show that a monotonous negative correlation between the offset distance of the coal cowl and the coal loading rate is identified, and that a smaller offset distance can effectively improve the coal loading rate of the drum. The conveying torque is significantly increased, easily inducing the drum choking, coal recycling coal over-crushing. Along with the increasing tilt angle, the rate of ejection loading decreases monotonically, and the rate of pushing loading increases first and then decreases. Coal loading rate is weakly affected by changes in coal cowl’s wrap angle. The results of response surface analysis reveal that the most significant factors affecting the drum’s coal loading rate are tilt angle and offset distance in ejection and pushing loading modes, respectively. The conclusions drawn here offer implications for improving the coal loading performance of the thin coal seam shearer drum, as well as certain guidance on the optimal design of coal cowl parameters.

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“…In addition, he compared the results of experiments and simulations and verified the feasibility and reliability of the DEM for reproducing the coal-loading process using the drum [31]. Tian [9] and Gao [32] also investigated the effect of helical angle, drum rotating speed, shearer hauling speed and barrel shape on the behavior of coarse coal particles during the loading process. Furthermore, the effect of the auxiliary loader on the improvement in coal-loading performance was studied based on DEM modeling, which provides a new method of improving the shearer's coal-loading performance [8].…”

Section: Introductionmentioning

confidence: 96%

“…The problems in the process of mining thin coal seams cannot be neglected and include the complicated mining environment and extremely poor loading performance caused by the small drum diameter, which restricts the efficiency of thin-coalseam mining and threatens the safety of workers. Therefore, improvement of the loading performance of thin-coal-seam shearers has become an important issue among scholars at home and abroad [8,9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Effect of Drum Barrel on Coal-Loading Performance of Thin-Coal-Seam Shearer Machines

et al. 2022

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Thin-coal-seam shearer mining efficiency is seriously restricted by the poor loading performance of the drum. The loading of the drum to the cracked coal lumps is based on a screw-conveying mechanism, and its loading performance is influenced by many structural parameters, including drum width, helical angle, axial tilt angle, number of blades and form and diameter of the barrel. The barrel diameter directly influences the drum envelope zone’s capacity, and its influence on loading performance is not yet clear. Therefore, this work first compared the drum-loading results between experiments and numerical modeling, and the results proved that the application of the discrete element method (DEM) to the modeling drum loading process is feasible and the results are reliable. Secondly, the influence of barrel diameter on particles’ axial velocity, loading rate and web depth was studied using the ejection and pushing modes. The results showed that the particles’ axial velocity has a noticeable impact on loading rate under ejection loading conditions, and the loading rate first increases and then decreases with the increase in barrel diameter. When the diameter is less than 700 mm in drum-pushing modes, the particles’ axial velocity plays an important role on drum loading; the filling level has an obvious impact on loading performance when the barrel diameter is larger than 700 mm. The drum loading ejection rate is 25% higher than that of pushing mode, which is due to the loading rate of particles located in a web depth from 300 to 600 mm. The influence of barrel diameter on loading performance using drum ejection is more obvious than that in pushing mode. The results provide a reference for drum structural design to some extent.

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Numerical simulation on coal loading process of shearer drum based on discrete element method

Cited by 5 publications

References 25 publications

Numerical study of forces acting on the drum cutting coal with gangue

Numerical study of forces acting on the drum cutting coal with gangue

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

Numerical Investigation of Effect of Drum Barrel on Coal-Loading Performance of Thin-Coal-Seam Shearer Machines

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