scholarly journals Dynamic Modeling of a Vibrating Screen Considering the Ore Inertia and Force of the Ore over the Screen Calculated with Discrete Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Manuel Moncada M. ◽  
Cristian G. Rodríguez
Keyword(s):  
Discrete Element Method ◽  
Dynamic Model ◽  
Dynamic Models ◽  
Adhesion Force ◽  
Angular Displacement ◽  
Slope Angle ◽  
Discrete Element ◽  
Vibrating Screen ◽  
Linear Dynamic ◽  
Element Method

Vibrating screens are critical machines used for size classification in mineral processing. Their proper operation, including accurate vibration movement and slope angle, can provide the benefits of energy savings and cost reductions in the screening process and the whole mining process. Dynamic models of the vibrating screen movement available in the literature do not simulate ore motion or its interaction with screen decks. The discrete element method (DEM) allows for the calculation of the dynamic of the ore. In this paper, two 2D three-degrees-of-freedom dynamic models for a vibrating screen are tested, using linear and nonlinear approaches for angular displacement. These models consider the inertia of the ore and the ore force calculated with DEM. A double-deck linear motion vibrating screen is simulated using the DEM software LIGGGTHS. DEM is used to obtain the ore parameters in the steady state and the force on the screen decks. Two cases are compared: Case 1 considers the ore as moving together with the vibrating screen, and Case 2 considers the ore force on the screen deck as calculated by DEM. Simulations are carried out with data for an industrial vibrating screen used in copper mining. The force over the screen is significantly different between the cases. Case 1 produces a force that is unrealistic because the ore cannot produce a high-amplitude adhesion force over the screen decks. In Case 2, no adhesion force acts between the ore and deck. It is concluded that the linear dynamic model used in Case 2 is adequate to evaluate the influence of the ore on the movement of the vibrating screen. The linear dynamic model considering the force as in Case 1 can be used to simulate a vibrating screen, as long as a correct calibration parameter is included to obtain an accurate motion amplitude.

Numerical simulation of particle screening efficiency of large multi-layer vibrating screen based on discrete element method

2021 ◽  
pp. 095440892110606
Author(s):  
Yujia Li ◽  
Peng Zhao ◽  
Li Mo ◽  
Tao Ren ◽  
Minghong Zhang
Keyword(s):  
Discrete Element Method ◽  
Environmental Protection ◽  
Inclination Angle ◽  
Discrete Element ◽  
Physical Parameters ◽  
Screening Process ◽  
Efficient Operation ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
Element Method

With the increasing requirements for energy conservation and environmental protection, multi-layer vibrating screens have become hot issues. Compared with single-layer vibrating screens, multi-layer vibrating screens has much better performance in terms of processing effect, treatment capacity, and environmental protection. The research on the physical parameters of the multi-layer vibrating screen is of great significance to the actual production. However, analysis and simulation studies of multi-layer vibrating screens are limited. In this paper, the screening process of wet particles on a multi-layer vibrating screen was simulated by using the discrete element method. The characteristics and application scope of the two vibration modes were analyzed. The particle penetration rate, the number of collisions, and the distribution of the particles under 23 combinations of structures and vibration parameters were investigated. The influence of different parameters on screening performance was analyzed. Several optimal combinations of frequency, amplitude and screen inclination angle under different working conditions were obtained. The screening efficiency of the balanced elliptic motion is higher than that of the linear motion. The best combination of the three parameters is 4 mm amplitude, 20 Hz frequency, and 3° inclination angle. The efficiency is higher when the particles follow a distribution of arithmetic on the screen. This study provides a reference for the efficient operation and optimal design of large multi-layer screening equipment.

scholarly journals Complex Failure Simulation of Underinclined Shale Slope Based on Discrete Element Method

2020 ◽  
Vol 24 (1) ◽  
pp. 83-89
Author(s):  
Bin Li ◽  
Da Huang
Keyword(s):  
Discrete Element Method ◽  
Slope Failure ◽  
Slope Angle ◽  
Soft Rock ◽  
Discrete Element ◽  
Failure Patterns ◽  
Site Investigations ◽  
Dip Angle ◽  
Different Parts ◽  
Element Method

A landslide occurred in the cut slope located in Chongqing west railway station, this slope belongs to a under-dip shale slope, which means that its bedding dip angle is larger than slope angle and it is comprised of soft rock. Some on-site investigations have been made to explore the deformation characteristics of this slope, the outcome suggested that sliding, buckling and toppling deformation existed at its different parts. To elucidate the complex failure mechanism exhibited by the under-dip slope under the long-term influence of gravity and material deterioration, the discrete element method has been employed in simulations. The simulated failure patterns have proven to be in strong agreement with the actual slope failure. This study suggests that sliding, buckling and toppling occur at different parts of the studied slope in sequence.

scholarly journals A Dynamic Model of Inertia Cone Crusher Using the Discrete Element Method and Multi-Body Dynamics Coupling

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 862
Author(s):  
Jiayuan Cheng ◽  
Tingzhi Ren ◽  
Zilong Zhang ◽  
Dawei Liu ◽  
Xin Jin
Keyword(s):  
Discrete Element Method ◽  
Dynamic Model ◽  
Discrete Element ◽  
Optimal Operation ◽  
Model Verification ◽  
Throughput Capacity ◽  
Manufacturing Cost ◽  
Time Dynamic ◽  
Cone Crusher ◽  
Element Method

The cone crusher is an indispensable equipment in complex ore mineral processing and a variant of the cone crusher is the inertia cone crusher. A real-time dynamic model based on the multibody dynamic and discrete element method is established to analyze the performance of the inertia cone crusher. This model considers an accurate description of the mechanical motions, the nonlinear contact, and the ore material loading response. Especially the calibration of ore material simulated parameters is based on the Taguchi method for the Design of Experiments. For model verification, the industrial-scale experiment was conducted on a GYP1200 inertia cone crusher. Two different drive speeds were included in the experiments, and the testing devices were used to acquire crusher performances, for instance, displacement amplitude, power draw, product size distribution, and throughput capacity in order to accurately compare simulation results. The preliminary model can be qualitatively evaluated the flow pattern of particles and quantitatively evaluated the crushing force distribution in the concave. Furthermore, the simulation predicts the variety of crusher performances using the drive speed and the fixed cone mass as input variables. The simulation model provides novel insight regarding the improvement of linings wear period, lowering manufacturing cost, and obtaining optimal operation parameters.

scholarly journals Structural optimization of baffle internals for fast particle pyrolysis in a downer reactor using the discrete element method

Clean Energy ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 167-179
Author(s):  
Bing Liu
Keyword(s):  
Discrete Element Method ◽  
Structural Optimization ◽  
Heat Carrier ◽  
Process Design ◽  
Slope Angle ◽  
Discrete Element ◽  
Coal Pyrolysis ◽  
The Mean ◽  
Downer Reactor ◽  
Element Method

Abstract The structural optimization of baffle internals for fast pyrolysis of coal with particulate mixing and heat transfer in a downer reactor using the discrete element method (DEM) has been investigated in this research. The pyrolysis terminal temperature at the exit of the downer reactor is not only decided by the volume-feeding-rate ratio of the coal to the sand, but also is affected by the inner structural design of the baffle internals in the downer reactor. As presented in the previous publication of the author, the inhibition from the baffle internals in a downer reactor can improve the particulate-mixing degree and heat carrier, and increase the mean residence time of the coal and heat-carrier particles in the downer reactor. The structure of the baffle internals in the downer reactor mentioned in this research can be optimized by the independently developed 3D soft-sphere model of the DEM programme of a 40-mm baffle length, a 30° baffle-slope angle and at least four baffles designed in the downer reactor, which is beneficial for the process design of coal pyrolysis with a heat carrier in the downer reactor.

scholarly journals VERIFICATION OF ROCKFALL MODEL, BASED ON THE DISCRETE ELEMENT METHOD

2016 ◽  
Author(s):  
А.Г. Кусраев ◽  
Д.Г. Минасян ◽  
Н.С. Орлова ◽  
Д.Г. Пантилеев ◽  
Ш.С. Хубежты
Keyword(s):  
Experimental Investigation ◽  
Discrete Element Method ◽  
Theoretical Investigation ◽  
Slope Angle ◽  
Discrete Element ◽  
Laboratory Equipment ◽  
Horizontal Section ◽  
Affected Area ◽  
Model Based ◽  
Element Method

Исследовалось движение обвала по склону, сопряженному с горизонтальным участком. Теоретическое исследование осуществлялось с использованием модели на основе метода дискретных элементов. Для верификации модели был проведен эксперимент на лабораторной установке. Представлено сравнение дальности пробега обвальной массы в зависимости от крутизны склона в экспериментах и расчетах. Получено удовлетворительное совпадение результатов The rockfall movement of the slope, which is associated with the horizontal section, was investigated. The theoretical investigation was performed using model, based on the Discrete element method. The experimental investigation was performed using laboratory equipment. Comparison between the experiment results and calculations were presented. Numerical calculations of the affected area of rockfall, performed for various values of the slope angle to horizontal surface, satisfactorily describe experiments

scholarly journals Experimental method for identifying constitutive parameters of rolling resistance between particles in discrete element method

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Dianrui Wang ◽  
Zhengguo Gao ◽  
Yajun Zhang ◽  
Pengkun Dong
Keyword(s):  
Discrete Element Method ◽  
Experimental Method ◽  
Angular Displacement ◽  
Time History ◽  
Rolling Resistance ◽  
Experimental System ◽  
Discrete Element ◽  
Restoring Force ◽  
Constitutive Parameters ◽  
Element Method

AbstractA method to identify the parameters of rolling resistance between particles in the discrete element method is proposed in this paper. Experiments revealed that a free rolling particle would swing back and forth marginally before it stops. We assume that the restoring force of the swing is mainly rolling resistance. An optical experimental system was designed to obtain the rolling resistance in the DEM model. A method to identify the parameters using the time history curve of the swing is proposed. We measured the time history of the angular displacement of cylindrical samples made of rubber and aluminum. In addition, the rolling stiffness and damping coefficients were identified. The identified parameters were applied to the discrete element model to simulate the experimental process. The results show that the time-history curve of swing obtained by DEM is in good agreement with the experimental curve. This verifies that the particle swings back and forth because of rolling resistance and that the parameters of the rolling resistance model can be determined by this experimental method

Study on How Sieving Parameters of Vibration Screen Influence Sieving Efficiency Based on DEM

2013 ◽  
Vol 444-445 ◽  
pp. 1038-1041
Author(s):  
Wen Jin Huang ◽  
Ya Yu Huang ◽  
Jun Shi ◽  
Shi Chang Han
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Traditional Methods ◽  
Vibrating Screen ◽  
Sieving Process ◽  
Design And Application ◽  
Element Method

Vibrating screen is the most commonly used sieving machinery, how to improve its sieving performance is a major issue during the design and application. Discrete element method (DEM) was employed here to analyze and simulate the sieving process, and the influence of the various sieving parameters on sieving efficiency were studied. The curve of relationship between the sieving parameters and sieving efficiency was established. Contrasted with traditional methods, DEM has great superiority on the sieving study.

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