A review on the advanced design techniques and methods of vibrating screen for coal preparation

Peng, Liping; Hua, Jiang; Chen, Xihui; Liu, Deyang; Feng, Huihui; Zhang, Lei; Zhao, Yuemin; Liu, Chusheng

doi:10.1016/j.powtec.2019.02.047

Cited by 63 publications

(24 citation statements)

References 71 publications

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“…Mining vibrating screens are widely used for coal mine washing and processing in China [1,2]. Due to difficult working conditions and long-term alternating loads, spring permanent deformation failure of the spring may occur, and this leads to a decrease in spring stiffness.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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Spring failure is one of the critical causes of the structural damage and low screening efficiency of mining vibrating screens. Therefore, spring failure diagnosis is necessary to prompt maintenance for the safety and reliability of mining vibrating screens. In this paper, a spring failure diagnosis approach is developed. A finite element model of mining vibrating screens is established. Simulations are carried out and the spring failure influence rules of spring failure on the dynamic characteristics of mining vibrating screens are obtained. These influence rules indicate that the amplitude variation coefficients (AVCs) of the four spring seats in the x, y, and z directions can reveal two kinds of single spring failure and four kinds of double spring failure, which are useful for diagnosing spring failure. Furthermore, experiments are conducted. Comparison analyses of the experimental results and simulation results indicate that the proposed approach is capable of revealing various kinds of spring failure. Therefore, this approach provides useful information for diagnosing spring failure and guiding technical staff to routinely maintain mining vibrating screens.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Relying on the intense alternating load generated by the rotation of the vibration exciter and engaged reciprocating motions of the elastic screen surface, acceleration of a flip-flow screen is nearly 50 g, which makes difficult-to-filter coal easy pass through screen pores [1]. However, with the high amplitude vibration, sustaining coupling load effects (e.g., the imposed alternating load, the inertial load of the screen body and the impact load of the screen surface) on the flip-flow screen are increased, which result in aggravating structural damages of the equipment [2]. Thus, a reasonable…”

Section: Introductionmentioning

confidence: 99%

Viscoelasticity of Rubber Springs Affects Vibration Characteristics of a Flip-Flow Screen With the High G Value

et al. 2020

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With the high G value of vibration, outstanding sieving behaviors of a flip-flow screen are more likely to appear, but structural damages are aggravated under the high amplitude vibration. Considering rubber springs role on the vibration energy dissipation, viscoelasticity of rubber springs (i.e., shear springs and vibration isolation springs), is noticed to deal with the above contradiction. However, when rubber springs experience large amplitude vibration, viscoelastic responses influence more on the amount of damping than in the linear (i.e., small amplitude) vibration regime, as the frequency dependence of rubber springs is noteworthy. For this purpose, the Generalized Maxwell model is used to depict the frequency dependence of rubber springs and the practical damping is converted to a series damping parameters of the system, numerical models of the flip-flow screen under startup and shutdown modes and steady working conditions are proposed and verified firstly. Secondly, in order to explore kinetics responses of the elastic screen panel under different rubber springs damping coefficients, nonlinear finite element model of which is established. Finally, effects of rubber springs nonlinear damping on screen frames vibrations and screen panels nonlinear responses are studied. Results indicate that hysteretic damping of rubber springs can effectively solve the conflict between vibration strength and structural reliability of the flip-flow screen, since the low sensitivities of maximum stresses and the high sensitivities of accelerations to rubber springs damping are found.

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“…The most important are the springs that suspend the machine [ 36 , 37 ], and bearings that hold the rotating shafts [ 38 , 39 ]. Due to the importance of this type of machine, attempts are made to optimize them at the stage of design based on previous experience [ 40 , 41 ]. In [ 42 ] Safranyik et al proposed the optimal oscillation parameters of the vibration screens.…”

Section: Introductionmentioning

confidence: 99%

Model of the Vibration Signal of the Vibrating Sieving Screen Suspension for Condition Monitoring Purposes

Michalak

Wodecki

Drozda

et al. 2020

Sensors

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Diagnostics of industrial machinery is a topic related to the need for damage detection, but it also allows to understand the process itself. Proper knowledge about the operational process of the machine, as well as identification of the underlying components, is critical for its diagnostics. In this paper, we present a model of the signal, which describes vibrations of the sieving screen. This particular type is used in the mining industry for the classification of ore pieces in the material stream by size. The model describes the real vibration signal measured on the spring set being the suspension of this machine. This way, it is expected to help in better understanding how the overall motion of the machine can impact the efforts of diagnostics. The analysis of real vibration signals measured on the screen allowed to identify and parameterize the key signal components, which carry valuable information for the following stages of diagnostic process of that machine. In the proposed model we take into consideration deterministic components related to shaft rotation, stochastic Gaussian component related to external noise, stochastic α-stable component as a model of excitations caused by falling rocks pieces, and identified machine response to unitary excitations.

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A review on the advanced design techniques and methods of vibrating screen for coal preparation

Cited by 63 publications

References 71 publications

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

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

Viscoelasticity of Rubber Springs Affects Vibration Characteristics of a Flip-Flow Screen With the High G Value

Model of the Vibration Signal of the Vibrating Sieving Screen Suspension for Condition Monitoring Purposes

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