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

Abstract

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.

Controlled experimental research and model design of double-layer high-frequency vibrating screen machine

“…At present, the University of Concepción, Edmundo Larenas has used two 2D three-degreesof-freedom dynamic models for a vibrating screen are tested, using linear and nonlinear approaches for angular displacement. Tests and mechanical modeling have proved that the linear dynamic model is sufficient to evaluate the motion characteristics of the double-layer vibrating screen [15], which is consistent with the method used in this article. The law of change between various parameters is not considered.…”

Spring Failure Analysis of Mining Vibrating Screens: Numerical and Experimental Studies

“…Failure diagnosis requires accurate dynamic modeling and system identification [6]. In recent years, many studies have reported on the dynamic modeling [7][8][9][10], dynamic design [11][12][13][14], dynamic optimization [15][16][17][18][19][20], particle motion analysis [21][22][23][24], and spring failure diagnosis of vibrating screens [25][26][27][28][29].…”

Research on the New Drive of a Laboratory Screen with Rectilinear Vibrations in Transient States

“…Many researchers deal with the problem of the steady-state operation of screens and numerical simulation DEM to simulate the material's behaviour on the screening board [21][22][23][24][25]. Some researchers have also attempted to develop a vibration measurement model that considers material disturbances [26,27]. Classic drive systems, due to flexible couplings, are characterized by a high value of vibration damping of the riddle, which significantly reduces the amplitude of vibrations during the transition through resonance.…”