Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

Peng, Liping; Feng, Huihui; Wang, Zhenqian; Wang, Haoyu; Yang, Huan; Huang, Huan

doi:10.3390/app9224911

Cited by 13 publications

(6 citation statements)

References 22 publications

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“…The influence of different factors on vibratory screening accuracy is comprehensively studied in [6]. The thorough design calculations and performance analysis of certain elements of the screens are presented in [7,8]. The problems of investigating the dynamic behavior of various types of vibratory screens are also widely covered in numerous papers, particularly in [9,10].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a vibratory screening conveyor equipped with a controllable centrifugal exciter

Kachur¹,

Korendiy²,

Lanets³

et al. 2023

Vib. proced.

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Vibratory screening, sieving, and conveying processes are widely used in various industries. Among a great variety of vibration exciters, the unbalanced rotors are the most reliable, simple, and widespread ones. Due to the changeable operating conditions of vibratory equipment, in some cases, there occurs a necessity to control the disturbance (excitation) parameters of the corresponding drives. The primary purpose of this study is to substantiate the design parameters and analyze the dynamic characteristics of the vibratory screening conveyor based on the single-mass oscillatory system, and equipped with the controllable centrifugal exciter. The research methodology consists of several basic stages: developing the conveyor’s dynamic diagram and deducing the differential equations of the system’s motion; designing the machine’s 3D-model and defining its main geometrical and inertial parameters; numerical modeling of the system’s oscillations in the Mathematica software; simulating the conveyor’s operation in the SolidWorks software. The research results present the time dependencies of the conveyor’s working member kinematic parameters at different eccentricities of the unbalanced mass. The main scientific novelty of this research is substantiating the idea and possibilities of implementing the enhanced controllable centrifugal exciter for changing the disturbance (excitation) conditions of the vibratory screening and conveying machines. The proposed ideas and obtained results can be used by researchers and designers of similar equipment while developing control systems for regulating its operational efficiency (performance) in accordance with the changeable loading conditions or technological requirements.

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Section: Introductionmentioning

confidence: 99%

Dynamics of a vibratory screening conveyor equipped with a controllable centrifugal exciter

Kachur¹,

Korendiy²,

Lanets³

et al. 2023

Vib. proced.

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“… 2 , 13 The screening operation is a critical process of coal beneficiation, which is widely used in mineral classification, coal desliming, tailings dewatering, and product demineralization. 14 − 16 The traditional linear vibrating screens are easily accumulated at the feeding end when the production load increases. This problem makes it difficult for fine particles to penetrate the screen, so the screening effect cannot satisfy the normal needs of the enterprise.…”

Section: Introductionmentioning

confidence: 99%

“…Appropriate coal preparation is the most effective method to approach the clean coal concept. , The screening operation is a critical process of coal beneficiation, which is widely used in mineral classification, coal desliming, tailings dewatering, and product demineralization. − The traditional linear vibrating screens are easily accumulated at the feeding end when the production load increases. This problem makes it difficult for fine particles to penetrate the screen, so the screening effect cannot satisfy the normal needs of the enterprise. , To solve this problem of material accumulation, in the 1960s, Burstlein proposed an equal-thickness screening method on the basis of the models to simulate motions of material flocks.…”

Section: Introductionmentioning

confidence: 99%

Research of the Collision Mechanics Model and Time-Frequency Characteristics during the Multistage Variable-Inclination Screening Process for Clean Coal

Huang

Liu

et al. 2022

ACS Omega

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Equal-thickness screening is a critical part of mineral processing; recently, the multistage variable-inclination equal-thickness screen (MSVIETS) has been utilized in the mining industry across the world. In this work, a model of the collision mechanics between particles and the multistage variable-inclination screen surface was established. The maximum collision force ( F max ) was found to be closely related to amplitude, frequency, screen surface inclination, and number of stages. The time-frequency response characteristics of multistage (3-, 4-, and 5-STAGE) screen surfaces were studied by the vibration test analysis system. The permeation screen distribution law of grain groups on the screen surface was revealed. The obtained results show the best screening performance can be obtained from the 5-STAGE scheme with a screening efficiency of higher than 95% and total mismatch content of less than 2%. The synergistic mechanism between two of the parameters was revealed by Box–Behnken response surface methodology (BBRSM). Then, the correlation between the screening evaluation index and the multiple parameters was obtained, and the significant order of the parameters influencing the screening evaluation index was F t > f > n .

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“…In the industry, two main classes of screens are used: resonant type and above resonance type. Various constructions of vibrating screens and the tuning of their technological parameters are discussed in [7][8][9][10][11]. The resonance regime is desirable; however, its control is complicated due to vulnerability of the sieving process to changes in bulk material thickness, particle distribution over the deck and their physical properties [12,13].…”

Section: Introductionmentioning

confidence: 99%

Trajectory Control for Vibrating Screen with Magnetorheological Dampers

Ogonowski

Krauze

2022

Sensors

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The article presents a method of vibrating screen trajectory control based on MR (magnetorheological) dampers applied in a screen suspension. A mathematical description of the dynamic screen model was derived, and parameters of this model were estimated based on experimental data from a semi-industrial vibrating screen. The investigated screen included a single mechanical exciter with unbalanced masses, generating a circular vibration trajectory and operating with over-resonant frequency close to 19 Hz. It was experimentally tested in several phases of operation: start-up, nominal operation at a target vibration frequency and shutdown. The implemented screen model was further extended and included several MR dampers oriented horizontally and vertically in the form of Bouc–Wen models. The Bouc–Wen model was identified based on experiments carried out for an MR damper subjected to harmonic excitations generated by the MTS (material testing system). Dominant frequencies of excitation varied by up to 20 Hz during experiments. The main novelty of the reported solution is that according to the proposed control algorithm, the desired forces generated by MR dampers emulate an additional virtual mechanical exciter of the vibrating screen. In turn, it interacts with the available exciter, resulting in conversion of the trajectory from circular to linear, which was validated in the presented study. For the purpose of simulation accuracy, the desired control force was additionally limited within the simulator by MR damper dissipative domain, which maps the constraints of a semi-active damper. The presented approach allows one to obtain a close to linear trajectory with only one exciter and with semi-active control of suspension stiffness. The results were successfully repeated with different configurations of desired trajectory, indicating that the effectiveness of the desired linear trajectory generation depends on its orientation. The reported findings may lead to the design of new vibrating screen constructions, taking advantage of the semi-active control of a suspension in the attenuation of disturbance resulting from varying processed material parameters.

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Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

Cited by 13 publications

References 22 publications

Dynamics of a vibratory screening conveyor equipped with a controllable centrifugal exciter

Dynamics of a vibratory screening conveyor equipped with a controllable centrifugal exciter

Research of the Collision Mechanics Model and Time-Frequency Characteristics during the Multistage Variable-Inclination Screening Process for Clean Coal

Trajectory Control for Vibrating Screen with Magnetorheological Dampers

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