Kinematics of variable-amplitude screen and analysis of particle behavior during the process of coal screening

Hua, Jiang; Zhao, Yuemin; Chen, Duan; Yang, Xuliang; Liu, Chusheng; Wu, Jida; Qiao, Jinpeng; Diao, Hairui

doi:10.1016/j.powtec.2016.10.076

Cited by 56 publications

(28 citation statements)

References 23 publications

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“…From this review of DEM simulations, we can summarize the following: (i) there is significant evidence that vibratory parameters are important for proper screening performance [1, 8-10, 42-44, 47, 52, 53]; (ii) DEM simulations do not consider the effects of ore mass flow on amplitude movement although mass flow affects amplitude [54,55] and efficiency depends on amplitude [1,9,10,42,43,52,53]; and (iii) DEM simulations do not focus on vibration. Most models use circular motion even when there are experimental data showing that the motion is not circular.…”

Section: Introductionmentioning

confidence: 99%

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

Moncada

Rodríguez

2018

Shock and Vibration

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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.

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Section: Introductionmentioning

confidence: 99%

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

Moncada

Rodríguez

2018

Shock and Vibration

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“…The displacement amplitude in vibrating direction ( ) and the vibrating direction angle ( ) can be obtained through Eqs. (13)(14):…”

Section: Calculation Of Characteristic Parametersmentioning

confidence: 99%

“…Baragetti and Villa presented an innovative design strategy for the optimization of the dynamic performances and the structural loads of heavy loaded vibrating screens [12], and Baragetti proposed a new design solution for heavy loaded vibrating screens which allowed the enhancement of structural resistance and the dynamic performances of a vibrating screen for inert materials [13]. Jiang et al proposed a novel large vibrating screen driven externally by an unbalanced two-axle excitation with a large span, and experimentally proved the excellent performance for coal screening [14][15]. Zhang et al predicted the physical characteristics of a large vibrating screen from its scale-down model, and provided an effective method for structural optimization and substructure coupling analysis of the large vibrating screen [16].…”

Section: Introductionmentioning

confidence: 99%

A novel high-strength large vibrating screen with duplex statically indeterminate mesh beam structure

Wang¹,

Liu²,

Wu³

et al. 2017

J. vibroeng.

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Screening is an indispensable unit process for separation of materials. Large vibrating screen is extensively used in coal processing because of its large production capacity. In this study, a novel large vibrating screen with duplex statically indeterminate mesh beam structure (VSDSIMBS) was presented. The dynamic model of VSDSIMBS was proposed, and characteristic parameters were obtained by theoretical calculations. In order to obtain more reliable and believable research results, model of a traditional vibrating screen (TVS) with the same mass was also established for comparisons with VSDSIMBS. The finite element (FE) method was applied to study the performance of VSDSIMBS and FE analysis of VSDSIMBS and TVS was completed by using characteristic parameters. Modal analysis results indicated that VSDSIMBS could avoid the resonance and run more smoothly than TVS. Furthermore, harmonic response analysis results showed that VSDSIMBS could improve the entire stress distribution, reduce high stress areas, and increase the strength of vibrating screen. With DSIMBS, the maximum stress of vibrating screen decreased from 130.53 to 64.54 MPa. The full-scale experimental tests were performed to validate the credibility and accuracy of FE analysis results. The stress and displacements of VSDSIMBS were measured under working conditions. The test results obtained are in good agreement with simulation results, and accord with conclusions made from FE analysis.

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“…However, long-term alternating loads are highly likely to lead to spring failure through spring stiffness decrease [8], causing a negative influence on the mining vibrating screen. On one hand, spring cracks [9][10][11]. On the other hand, spring failures could produce a loss of particle separation efficiency, thus hardly meeting practical process demands [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations were carried out, and the results showed that the proposed model is feasible. In addition, spring failure simulations were also carried out, and the results indicated that the x, y, and z direction amplitude change rules for all cracks [9][10][11]. On the other hand, spring failures could produce a loss of particle separation efficiency, thus hardly meeting practical process demands [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Rigid Body Model of Vibrating Screen for Spring Failure Diagnosis

et al. 2019

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Springs are critical components in mining vibrating screen elastic supports. However, long-term alternating loads are likely to lead to spring failures, likely resulting in structural damages to the vibrating screen and resulting in a lower separation efficiency. Proper dynamic models provide a basis for spring failure diagnosis. In this paper, a six-degree-of-freedom theoretical rigid body model of a mining vibrating screen is proposed, and a dynamic equation is established in order to explore the dynamic characteristics. Numerical simulations, based on the Newmark-β algorithm, are carried out, and the results indicate that the model proposed is suitable for revealing the dynamic characteristics of the mining vibrating screen. Meanwhile, the mining vibrating screen amplitudes change with the spring failures. Therefore, six types of spring failure are selected for simulations, and the results indicate that the spring failures lead to an amplitude change for the four elastic support points in the x, y, and z directions, where the changes depend on certain spring failures. Hence, the key to spring failure diagnosis lies in obtaining the amplitude change rules, which can reveal particular spring failures. The conclusions provide a theoretical basis for further study and experiments in spring failure diagnosis for a mining vibrating screen.

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Kinematics of variable-amplitude screen and analysis of particle behavior during the process of coal screening

Cited by 56 publications

References 23 publications

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

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

A novel high-strength large vibrating screen with duplex statically indeterminate mesh beam structure

A Theoretical Rigid Body Model of Vibrating Screen for Spring Failure Diagnosis

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