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

2021 ◽  
pp. 095440622110263
Author(s):  
Lijuan Zhao ◽  
Meichen Zhang ◽  
Baisheng Shi ◽  
Xionghao Liu ◽  
Yadong Wang
Keyword(s):  
Discrete Element Method ◽  
Loading Rate ◽  
Rotation Speed ◽  
Discrete Element ◽  
Design Parameters ◽  
Main Function ◽  
Cutting Depth ◽  
Lump Coal ◽  
Spiral Angle ◽  
Element Method

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.

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

2021 ◽  
pp. 014459872110135
Author(s):  
Zhen Tian ◽  
Shuangxi Jing ◽  
Lijuan Zhao ◽  
Wei Liu ◽  
Shan Gao
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Loading Rate ◽  
Low Cost ◽  
Element Model ◽  
Discrete Element ◽  
Helix Angle ◽  
Loading Process ◽  
Coal Particles ◽  
Element Method

The drum is the working mechanism of the coal shearer, and the coal loading performance of the drum is very important for the efficient and safe production of coal mine. In order to study the coal loading performance of the shearer drum, a discrete element model of coupling the drum and coal wall was established by combining the results of the coal property determination and the discrete element method. The movement of coal particles and the mass distribution in different areas were obtained, and the coal particle velocity and coal loading rate were analyzed under the conditions of different helix angles, rotation speeds, traction speeds and cutting depths. The results show that with the increase of helix angle, the coal loading first increases and then decreases; with the increase of cutting depth and traction speed, the coal loading rate decreases; the increase of rotation speed can improve the coal loading performance of drum to a certain extent. The research results show that the discrete element numerical simulation can accurately reflect the coal loading process of the shearer drum, which provides a more convenient, fast and low-cost method for the structural design of shearer drum and the improvement of coal loading performance.

scholarly journals ВПЛИВ КОНСТРУКЦІЙ ВІДЦЕНТРОВИХ ЗМІШУВАЧІВ НА ЇХ ЗГЛАДЖУВАЛЬНУ ЗДАТНІСТЬ

2020 ◽  
Vol 142 (1) ◽  
pp. 11-18
Author(s):  
В. В. Стаценко ◽  
О. П. Бурмістенков ◽  
Т. Я. Біла
Keyword(s):  
Discrete Element Method ◽  
Residence Time ◽  
Mixing Time ◽  
Discrete Element ◽  
Point Of View ◽  
Design Parameters ◽  
Discrete Elements ◽  
Bulk Materials ◽  
Design Features ◽  
Element Method

Studying the influence of continuous centrifugal mixers design features on their smoothing ability. The methods used are discrete elements, mathematical modeling and regression analysis. The paper considers five continuous centrifugal mixers designs with conical and parabolic rotors. The mixers design features are determined, allowing to change their smoothing ability. Mathematical models of the bulk materials particles movement inside each mixer have been developed based on the discrete element method. The considered mixers reaction to a step change of the key component amount is investigated. The transients parameters are calculated and the particles average residence time in the mixer is determined. It is established that the introduction of turbulizers in the mixers design increases the particles kinetic energy, which leads to a decrease in their residence time in the mixer. Moreover, the absence of a turbulizer leads to a decrease in the mixing intensity. It was also found that the most effective way to increase the mixer smoothing ability is the introduction of additional rotors. In terms of the technological and design parameters combination, the use of mixers with a conical rotor and a turbulizer is the most effective from the point of view for increasing the smoothing ability. On the discrete element method basis, the bulk materials particles movement models in continuous centrifugal mixers of five designs have been developed. The influence of the mixers design features on their smoothing ability and average mixing time is determined. The results obtained allow us to select the appropriate mixer design according to the specified requirements for smoothing ability.

scholarly journals Mechanical analysis and research of the conveyor belt of plane turning belt conveyor based on Discrete Element Method

2017 ◽  
Vol 41 (1) ◽  
pp. 55-62
Author(s):  
De-yong Li ◽  
Shuang Wang ◽  
Kun Hu
Keyword(s):  
Discrete Element Method ◽  
Inclination Angle ◽  
Turning Point ◽  
Elevation Angle ◽  
Load Condition ◽  
Discrete Element ◽  
Conveyor Belt ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Element Method

In view of the size and the change of the load force of the conveyor belt at the turning point of the plane turning belt conveyor, the influencing factors of the stress of the conveyor belt at the turning point of the plane turning belt conveyor under full load condition are analyzed. A three dimensional model of the turning point of the plane turning belt conveyor is established. Combined with previous research experience, the formula for calculating the load is put forward. Based on discrete element method, multiple sets of internal curve elevation angle and the belt speed are used for dynamic simulation analysis. The results showed that the middle of conveyor belt is the most stressed, the lateral force second, the force of the inner conveyor belt is the least. Outside force increases with the increase of speed; there is no change in the middle band; the inner band force decreases with the increase of the velocity. Outside force decreases with the decrease of the inclination angle. With the change of the inclination angle, the force is basically unchanged. With the decreasing of the inclination angle, the force increases gradually. By optimizing the design parameters of the plane turning belt conveyor, the force of belt is reduced, and the service life of belt is improved.

scholarly journals PARAMETER OPTIMIZATION AND EXPERIMENT OF SLIDER-HOLE-WHEEL SEED-METERING DEVICE BASED ON DISCRETE ELEMENT METHOD

2021 ◽  
pp. 410-420
Author(s):  
Xiaoshuang Zhang ◽  
Dequan Zhu ◽  
Kang Xue ◽  
Lanlan Li ◽  
Jianjun Zhu ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Hybrid Rice ◽  
Rotation Speed ◽  
Field Tests ◽  
Discrete Element ◽  
Seeding Rate ◽  
Simulation Experiments ◽  
Rice Seeds ◽  
Seed Metering Device ◽  
Element Method

To improve the adaptability and precision of the slider-hole-wheel seed-metering device to meet the requirements of precision sowing, the single factor simulation experiments and the three factors three levels of orthogonal simulation experiments were carried out based on the discrete element method. The rotation speed of the seeding shaft, the shape of the hole, and the depth of the hole were set as experiment factors. The results of simulation experiments showed that the qualified rate was the highest when the rotation speed of the seeding shaft was 30 r/min, the shape of the hole was oval, and the depth of the hole was 9 mm. The qualified rate, replay rate, and miss-seeding rate were 89.09 %, 3.64 %, and 7.27 %，respectively. The hybrid rice seeds of Zhongnong 2008, Chuangliangyou 4418, and Gangyou 898 were chosen as the materials for the bench and field seeding performance tests to verify the reliability of the simulation results. The test results showed that the qualified rate of Zhongnong 2008, Chuangliangyou 4418, and Gangyou 898 seed in bench tests were 85.07 %, 85.20 %, and 82.13 %, and the qualified rate of Zhongnong 2008, Chuangliangyou 4418, and Gangyou 898 seed in field tests were 82.13 %, 82.27 %, and 80.53 %. The seeding performance with the three kinds of rice seeds could meet the agronomic requirements for precision sowing of hybrid rice. The paper provided the basis for the structure optimization and seeding performance improvement of the slider-hole-wheel seed-metering device.

Discrete Element Method Simulation of Residual Stresses in Grinding of Granite with Single Diamond Grain

2013 ◽  
Vol 300-301 ◽  
pp. 1304-1308
Author(s):  
Liang Kang ◽  
Yong Ye
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Discrete Element Method ◽  
Element Model ◽  
Discrete Element ◽  
Discrete Element Model ◽  
Cutting Depth ◽  
Discrete Element Method Simulation ◽  
Diamond Grain ◽  
Element Method

The discrete element model and the model of single diamond grain grinding process of granite were constructed through numerical simulation and calibration of mechanical properties. Based on the models, the grinding processes of granite was dynamically simulated, and the effects of different rank angles, grinding speeds and cutting depths on the distribution of residual stresses as the depth of workpiece were also analyzed. The results show that the residual stress in the workpiece is relatively small after grinding when the tool rank angle lays in a small negative (-200 to 00). Otherwise, when the tool rank angle is too large or too small, there is a significant residual stress. The residual stresses in the workpiece increase with the increase of grinding speed and cutting depth. The residual stress nephogram was accomplished and the generated mechanism of residual stress was also analyzed. The results proved that the discrete element method (DEM) is an effective way to analyze the residual stress

Dynamics Model Research of Centrifugal Barrel Surface Finishing Based on 3D Discrete Element Method

2009 ◽  
Vol 416 ◽  
pp. 127-132 ◽  
Author(s):  
Chun Hua Song ◽  
Shi Chun Yang
Keyword(s):  
Discrete Element Method ◽  
Process Parameters ◽  
Production Efficiency ◽  
Discrete Element ◽  
Surface Finishing ◽  
Design Parameters ◽  
Dynamics Model ◽  
Fill Ratio ◽  
Abrasive Particles ◽  
Element Method

Dynamics model on abrasive particles and workpieces during the centrifugal barrel surface finishing process was built by Discrete Element Method (DEM). The motion status of abrasive particles and workpieces was visually simulated and some important process parameters were numerically studied. The influence of fill ratio on finishing efficiency was analyzed, and finishing efficiency was the highest as the fill ratio is 65%. the simulation results are basically coincident to the experimental results. Both results have proved that filling ratio is the main parameter that changes medium motion laws, which provides an very efficient way to further optimize design parameters and process parameters, as well as to improve production efficiency.

scholarly journals Optimal Speed Control for a Semi-Autogenous Mill Based on Discrete Element Method

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 233
Author(s):  
Xiaoli Wang ◽  
Jie Yi ◽  
Ziyu Zhou ◽  
Chunhua Yang
Keyword(s):  
Sliding Mode Control ◽  
Discrete Element Method ◽  
Rotation Speed ◽  
Sliding Mode ◽  
Discrete Element ◽  
Operating Parameters ◽  
Optimal Speed ◽  
Mode Control ◽  
The Relationship ◽  
Element Method

The rotation speed of a mill is an important factor related to its operation and grinding efficiency. Analysis and regulation of the optimal speed under different working conditions can effectively reduce energy loss, improve productivity, and extend the service life of the equipment. However, the relationship between the optimal speed and different operating parameters has not received much attention. In this study, the relationship between the optimal speed and particle size and number was investigated using discrete element method (DEM). An improved exponential approaching law sliding mode control method is proposed to track the optimal speed of the mill. Firstly, a simulation was carried out to investigate the relationship between the optimal speed and different operating parameters under cross-over testing. The model of the relationships between the optimal rotation speed and the size and number of particles was established based on the response surface method. An improved sliding mode control using exponential approaching law is proposed to track the optimal speed, and simulation results show it can improve the stability and speed of sliding mode control near the sliding surface.

Simulation Analysis of Seed Metering Procedure in Scoop Metering Device Based on Discrete Element Method

2012 ◽  
Vol 157-158 ◽  
pp. 550-557 ◽  
Author(s):  
Yu Jie Ji ◽  
Hong Da Xue ◽  
Cheng Hua Li
Keyword(s):  
Discrete Element Method ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Design Parameters ◽  
Structure Parameters ◽  
Key Factor ◽  
Seed Metering Device ◽  
Element Method

Seed metering procedure of metering device was a key factor to affect performance of precision seed metering device. Based on analysis of seed holding volume of metering scoop, relationship between the seed holding volume and structure parameters of the metering scoop was established, and beginning and ending angles of seed clearing during the seed metering procedure were determined. Simulation analysis of seed metering procedure with different parameters of the metering device was carried out by mean of discrete element method to identify the influences of metering scoop parameters on the performance the metering device, and suitable range of structure parameters of the metering scoop were investigated. Finally, the reasonability of design parameters of the metering scoop for experiment usage was verified.

Computer Simulation on Centrifugal Barrel Surface Finishing Based on Discrete Element Method

2008 ◽  
Vol 53-54 ◽  
pp. 45-50
Author(s):  
C.H. Song ◽  
Shi Chun Yang ◽  
J.M. Wang ◽  
Y.Q. Zhang
Keyword(s):  
Discrete Element Method ◽  
Production Efficiency ◽  
Discrete Element ◽  
Contact Forces ◽  
Velocity Variation ◽  
Surface Finishing ◽  
Design Parameters ◽  
Abrasive Particles ◽  
Revolution Speed ◽  
Element Method

According to the motion features of abrasive particles and workpieces in centrifugal roller, considering the abrasive particles and workpieces as two kinds of ball particles with different materials and sizes, 3-Dimensional Discrete Element Method (DEM) was used to build the dynamics model of single abrasive particles and workpieces motion. Based on such model, in this paper, the influence of rotation-revolution ratio on medium movement was mainly analyzed. Supposing filling ratio as 20%, mixing ratio as 1.5:1 and revolution speed as 180r/min, the movement procedure of medium within centrifugal roller was respectively simulated under the different cases of rotation-revolution ratio as -0.13, -1 and -2, then the velocity variation diagram and the average contact forces diagram for abrasive particles or workpieces under different rotation-revolution ratio were obtained, the simulation results are basically coincident to the experimental results. Both results have proved that rotation-revolution ratio is the main parameter that changes medium motion law, which provides a very efficient way to further optimize design parameters and process parameters, as well as to improve production efficiency.

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