Performance Optimization of a New Air Table and Flip-flow Screen for Fine Particle Dry Separation

Akbari, Hamid; Ackah, Louis Akainya; Mohanty, Manoj Kumar

doi:10.1080/19392699.2017.1389727

Cited by 38 publications

(9 citation statements)

References 9 publications

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“…Due to insufficient vibration strength, traditional vibration screens may encounter low screening efficiency when processing moist materials [7][8][9] and blocking of screen apertures by near-mesh particles [10][11][12]. However, the flipflow screens employed in the coal preparation industry have great advantages over traditional vibrating screens in the enhancement of screen surface vibration strength and few blockages of the apertures [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of an Industrial‐Scale Flip‐Flow Screen with Crank‐Link Structure and Parameters Optimization

Liu

Shen

et al. 2021

Shock and Vibration

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Flip-flow screens are increasingly used in the processing of fine wet coal. In this work, the vibration characteristics of an industrial-scale flip-flow screen with crank-link structure (FFSCLS) were investigated theoretically and experimentally. An improved kinematic model of FFSCLS was proposed and experiments are carried out to verify the reasonability. The effects of the key parameters of the eccentricity of the crankshaft, the rotational speed of the crankshaft, and the tension length of the screen surface on the vibration characteristics of the screen were investigated parametrically. The results show that the kinematic model can describe the vibration characteristics of screen perfectly with the maximum error between the theoretical and experimental results being within 6.96%. Moreover, the key parameters of the eccentricity of the crankshaft, the rotational speed of the crankshaft, and the tension length of the screen surface have significant effects on the vibrations of the screen body and screen surface. These parameters should be optimized to achieve maximum screening performance of the FFSCLS. This work should be useful for optimal design and efficient operation of the flip-flow screen.

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Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of an Industrial‐Scale Flip‐Flow Screen with Crank‐Link Structure and Parameters Optimization

Liu

Shen

et al. 2021

Shock and Vibration

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“…Cleary et al [18,19] investigated the separation performance of a full industrial-scale double-deck banana screen for a peak acceleration of 5 g. Zhou et al [20] reported that, due to the effects of collisions and the resonance, the average vibration intensities of the elastic screen rod and tube were larger than 20. Akbari et al [21] evaluated the dry screening efficiency of the Liwell flipflow screen at 1 mm and 2 mm cut sizes. Differing from the VFFS, the Liwell flip-flow screen is driven by a crank and connecting rod, and its dynamic characteristics are stable during screening process.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Vibrating Flip-Flow Screen and Analysis for Screening 3 mm Iron Ore

Wang

Pang

et al. 2020

Shock and Vibration

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Deep dry screening is the key unit in mineral processing. A vibrating flip-flow screen (VFFS) can provide effective solutions for screening fine-grained minerals, and it has been extensively used in many industrial fields. An accurate dynamic model of VFFS considering the influence of materials is significant for its dynamic analysis and screening process research, but it has rarely been studied in detail. In this paper, an improved dynamic model of VFFS is proposed and its dynamic equations are solved to find the reasonable operating condition, and experiments are carried out to verify the reasonability of the proposed model under no-load and loading materials conditions. Furthermore, the method of multistage sampling and multilayer screening is also applied to evaluate the screening performance of iron ore at 3 mm cut size on VFFS. Results show that when the mass of materials, relative amplitude, and operating frequency have values of 107 kg, about 6 mm and 80.79 rad/s, respectively, the screening efficiency gradually increases with an increase of screening length, reaching 89.05%; however, it does not change much when the screening length exceeds 1900.8 mm. Additionally, the misplaced materials of coarse particles will continue to increase as the screening length increases. This provides theoretical and technical support for the optimization of the length of the VFFS.

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“…Therefore, the elastic screen mesh mounted on the main and floating screen frames is tensioned and released periodically to achieve high acceleration values (30~50 g). Because of this advantage, plugging particles can easily Symmetry 2020, 12, 1644 2 of 25 pass through the screen, and thus increase screening capability and efficiency [8][9][10]. In a previous study, the motion of the screen mesh of a flip-flow screen was investigated by considering the screen mesh as a simply supported beam [11].…”

Section: Introductionmentioning

confidence: 99%

Research on Static and Dynamic Characteristics of Shear Spring of the Vibrating Flip-Flow Screen

Zhao

Wang

et al. 2020

Symmetry

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The vibrating flip-flow screen (VFFS) is a high-efficiency device currently used for deep screening of moist fine-grained materials. During VFFS operation, the normal operation of the screen is affected by fatigue damage to the shear springs arranged symmetrically on both sides of the screen, leading to equipment failures and disruption production. In this paper, the shear spring’s static and dynamic characteristics in different operation conditions were studied using the INSTRON 8801 fatigue test system and Dynacell dynamic sensors. Using an experimental test of shear spring stiffness and damping coefficients, the effects of some factors, i.e., temperature, hardness, amplitude and frequency, were studied. The results show that the temperature of the shear spring on the left side of the flip-flow screen was higher than that of the right side (driving side). With an increase in temperature, the stiffness of the shear spring decreased. With the increase in amplitude, the dynamic stiffness decreased and the damping coefficients did not change; with the increase in frequency, the dynamic stiffness increased and the damping coefficient decreased. At the same amplitude, with the increase in hardness of the shear spring, the dynamic stiffness increased. Finally, the stiffness and damping coefficients of the shear spring before and after tearing were obviously reduced. These research results reveal the relationship of the characteristics of a shear spring with operational conditions, and could provide a theoretical reference for the design of the VFFS and the selection of the shear spring.

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Performance Optimization of a New Air Table and Flip-flow Screen for Fine Particle Dry Separation

Cited by 38 publications

References 9 publications

Vibration Characteristics of an Industrial‐Scale Flip‐Flow Screen with Crank‐Link Structure and Parameters Optimization

Vibration Characteristics of an Industrial‐Scale Flip‐Flow Screen with Crank‐Link Structure and Parameters Optimization

Dynamic Characteristics of a Vibrating Flip-Flow Screen and Analysis for Screening 3 mm Iron Ore

Research on Static and Dynamic Characteristics of Shear Spring of the Vibrating Flip-Flow Screen

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