A rigid-flexible coupled dynamic model of a flip-flow vibrating screen considering the effects of processed materials

Lin, Di; Ji, Jinchen; Wang, Xinwen; Wang, Yixin; Xu, Ningning; Ni, Qing; Zhao, Guofeng; Feng, Ke

doi:10.1016/j.powtec.2023.118753

Cited by 8 publications

(10 citation statements)

References 31 publications

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“…The FFVS can be classified as a two-mass vibration system in the context of dynamic analysis, and the relative amplitude between the main and floating frames along the screen surface has a significant impact on the screening performance of the FFVS [18,19]. When the FFVS operates within different frequency bands, the loading of materials can cause a certain amount of reduction in the relative amplitude between the two frames [18,19]. Selection of a suitable operating frequency region can mitigate the influence of loading materials and the changes of ambient temperature on the relative amplitude between the two frames.…”

Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

“…During the screening process of FFVSs, the nonlinear coupling force between the loaded materials and the flip-flow screen panels can be considered as the stiffness force and damping force of the shear spring. The effect of the materials loaded on the dynamics of FFVSs can be equivalently related to the impact of increasing the shear spring stiffness and damping on the dynamic response of the linear FFVS without taking into account the screen panels and the processed materials [19]. The linear dynamic model of FFVSs and its amplitude-frequency response are shown in Figure 2 [18].…”

Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

“…Furthermore, when the relative displacement between the two frames exceeds the slack length of the screen panels, the screen panels undergo stretching deformation, impeding the relative motion between the two frames. This nonlinear behavior restricts the relative movement from surpassing the resonance amplitude of the second resonance region of the screen system [17,19]. Therefore, the appropriate operating frequency band for FFVSs must be chosen between the first resonance frequency ω 01 and the second resonance frequency ω 02 of the main frame.…”

Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

“…Yu et al [18] observed a reduction in the relative amplitude of an FFVS due to the loading of materials, leading to a decrease in the screening efficiency. Lin et al [19] conducted a theoretical investigation into the dynamics of the FFVS on loading the materials and demonstrated that the relative amplitude of the FFVS decreased as the processing capacity increased. Li et al [14] experimentally confirmed that the screening efficiency of an FFVS could decrease with increasing infeed rate.…”

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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Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

Section: Reasonable Operating Frequency Region For Ffvssmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Lin,

Wang,

et al. 2024

Minerals

Self Cite

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“…The screen case of an FFVS consists of a main screen frame, a floating screen frame, rubber shear springs, and elastic flip-flow screen panels, with two ends connecting to the main and floating screen frames, respectively [15,16]. The main and the floating screen frames are interconnected by rubber shear springs, allowing the two screen frames to undergo the relative motion along the screen's surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Screen-Panel Tensile Length and Material Characteristics on Screening Performance of Flip-Flow Vibrating Screens for Dry-Screening Fine, Low-Grade Bituminous Coal

Lin,

Zhang,

et al. 2024

Minerals

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Flip-flow vibrating screens (FFVSs) effectively tackle the challenges posed by the dry deep-screening of wet, fine, low-grade bituminous coal, thereby facilitating advancements in the thermal coal preparation process. The tensile lengths of the screen panels not only influence the service lives of the screen panels but also play a pivotal role in determining the screening performance of the FFVSs. To investigate the effect of the screen-panel tensile length on the screening performance of an FFVS, this study constructs a dual-mass flip-flow screening test rig. The experimental results reveal that when the fine-particle content and the external water content in the feed of low-grade bituminous coal are 55% and 16%, respectively, the most favorable tensile length of the screen panels is 2 mm. With a fine-particle content of 55% in the feed of low-grade bituminous coal and an increase in the external water content from 4% to 20%, the screening efficiency of the FFVS initially decreases and then increases. Notably, low-grade bituminous coal with 16% external water content poses the most challenging screening conditions. Furthermore, when the external water content of the low-grade bituminous coal is 16% and the fine-particle content in the feed increases from 25% to 55%, the screening efficiency of the FFVS gradually improves.

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Modeling and analysis for landing airbag–lunar soil interaction using a CPU–GPU-based FMBD-DEM computational framework

Lei,

Xu,

Tang

et al. 2024

Mechanism and Machine Theory

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A rigid-flexible coupled dynamic model of a flip-flow vibrating screen considering the effects of processed materials

Cited by 8 publications

References 31 publications

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

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

Effect of Screen-Panel Tensile Length and Material Characteristics on Screening Performance of Flip-Flow Vibrating Screens for Dry-Screening Fine, Low-Grade Bituminous Coal

Modeling and analysis for landing airbag–lunar soil interaction using a CPU–GPU-based FMBD-DEM computational framework

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