Simulation of particles motion on a double vibrating flip-flow screen surface based on FEM and DEM coupling

Zhao, Guofeng; Pu, Kunwei; Xu, Ningning; Gong, Sanpeng; Wang, Xinwen

doi:10.1016/j.powtec.2023.118422

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…After the analysis of the grain size composition of the raw coal, 3.5 kg of raw coal was placed on the FFSP and screened. According to the research by Zhao [23], the average velocity of particles of different particle sizes along the material flow direction on the FFS is between 0.5-1.2 m/s. Based on this conclusion, it would take 24 s for all materials to pass through a 12 m long FFS.…”

Section: Screening Experiments Of the Ffspmentioning

confidence: 99%

“…Due to the self-cleaning efficacy facilitated by the repetitive motion of relaxation stretching relaxation of FFSPs, flip-flow screens have gained extensive adoption in the screening process of moist fine materials. This motion pattern generates high acceleration on the surface of the screen plates, effectively addressing the prevalent challenge of hole blocking commonly encountered in industrial screening operations [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pre-Stretching Amount on Motion Characteristics and Screening Efficiency of Flip-Flow Screen Plates

Wang,

Geng,

et al. 2024

Minerals

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This study systematically investigates the impact of pre-stretching amount (PSA) on the acceleration, motion status, and screening efficiency of the Flip-flow screen plate (FFSP). Initially, a nonlinear spring-multi-body model of the FFSP is established. Subsequently, the acceleration signals at the midpoint of the FFSP under various PSAs are measured and analyzed. The nonlinear stiffness coefficient of FFSP along the vertical direction is then determined and it is found that simplifying the nonlinear spring-multi-body system to a nonlinear spring-tri-body system under the experimental conditions can maintain the calculation error of FFSP’s acceleration within 30%. Phase and Poincaré mapping diagrams of the FFSP under different PSAs are subsequently created to illustrate the impact of PSA on the motion status of the FFSP. Finally, screening experiments are performed to study the optimal PSA for a kind of bituminous coal from Shanxi province.

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Section: Screening Experiments Of the Ffspmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Stretching Amount on Motion Characteristics and Screening Efficiency of Flip-Flow Screen Plates

Wang,

Geng,

et al. 2024

Minerals

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“…The rotation of the exciter generates centrifugal force, causing the main frame to move in a quasi-circular motion relative to the ground. With the shearing action generated by the shear springs along the screen surface, the floating frame, connected to the main screen frame through the shear springs, undergoes reciprocating linear motion relative to the main frame along the screen surface [12][13][14]. In the direction perpendicular to the screen surface, the high stiffness of the shear springs results in minimal relative movement between the main and the floating frames.…”

Section: Structure and Working Principle Of Ffvssmentioning

confidence: 99%

“…Vibrating screening machines are commonly used for classifying and dewatering powder and granular materials, to achieve an ideal particle size distribution and meet production requirements [9][10][11]. Flip-flow vibrating screens (FFVSs) were developed for screening sticky and wet materials, which tend to adhere to each other and block the screen apertures [12,13]. The unique trampoline-like motion of the flipflow screen panels effectively disaggregates sticky and wet particle groups, loosening and layering the materials.…”

Section: Introductionmentioning

confidence: 99%

“…The self-cleaning ability of FFVSs is a distinct advantage that conventional vibrating screens with inflexible screen panels do not possess. As a result, the cut-off size of the novel FFVS is below 3 mm for classifying wet fine materials [12][13][14]. Banana flip-flow screens, a representative type of FFVSs, offer the advantage of equal-thickness screening, which can enhance screening efficiency [15,16].…”

Section: Introductionmentioning

confidence: 99%

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A Method for Stabilizing the Vibration Amplitude of a Flip-Flow Vibrating Screen Using Piecewise Linear Springs

Lin,

Wang,

et al. 2024

Minerals

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The flip-flow vibrating screen (FFVS) is a novel multi-body screening equipment that utilizes vibrations to classify bulk materials in the field of screening machinery. The relative amplitude of FFVSs determines the tension and ejection intensity of elastic flip-flow screen panels, which is a critical operating parameter affecting the screening performance. However, FFVSs generally suffer from large variations of relative amplitude caused by the loading of materials and the changes in shear spring stiffness (the temperature changes of the shear springs lead to their stiffness changes), which significantly reduce the screening efficiency and lifespan of FFVSs. To address this problem, this paper proposes a nonlinear stiffness-based method for stabilizing the vibration amplitude of FFVSs using piecewise linear springs. By introducing these springs between the two frames, the sensitivity of the relative amplitude to shear spring stiffness is reduced, thereby achieving the stabilization of the relative amplitude of FFVSs. In this study, the variations of the vibration amplitude of the FFVS due to the loading of materials and the changes in shear spring stiffness were first demonstrated in a reasonable operating frequency range. Then the reasonable operating frequency range and dynamics of the resultant nonlinear flip-flow vibrating screen (NFFVS) with piecewise linear springs were investigated using the harmonic balance method (HBM) and the Runge–Kutta numerical method. The operating frequency region for the NFFVS lies between the critical frequency ωcs and the frequency ωlb corresponding to the saddle-node bifurcation point. Finally, a test rig was designed to validate the theoretical predictions. Theoretical and experimental results demonstrate that piecewise linear springs can effectively stabilize the relative amplitude of the FFVS.

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Study on screening process and segregation mechanism of wet sand and gravel particles based on discrete element method

Zhou,

Zhang,

Liu

et al. 2023

Granular Matter

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Simulation of particles motion on a double vibrating flip-flow screen surface based on FEM and DEM coupling

Cited by 12 publications

References 27 publications

Effects of Pre-Stretching Amount on Motion Characteristics and Screening Efficiency of Flip-Flow Screen Plates

Effects of Pre-Stretching Amount on Motion Characteristics and Screening Efficiency of Flip-Flow Screen Plates

A Method for Stabilizing the Vibration Amplitude of a Flip-Flow Vibrating Screen Using Piecewise Linear Springs

Study on screening process and segregation mechanism of wet sand and gravel particles based on discrete element method

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