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A novel vibration isolator for vibrating screen based on magnetorheological damper

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Abstract

A vibrating screen is widely used in raw coal screening, but intensive resonance in the startup and shutdown stages shortens the service life of the vibrating screen and generates vibration damage to surrounding buildings. Therefore, we designed a novel vibration isolator based on a magnetorheological damper, aiming to improve the vibration isolation performance of the vibrating screen. The rheological mechanical model of damping force was analyzed based on the Bingham model, and a magnetic circuit was designed according to electromagnetic theory. Then, an experiment was designed to evaluate the vibration isolation performance of the vibration isolator. The results show that the novel vibration isolator, compared with the metal spring ones, reduces the maximum resonance amplitude by 64 % in the resonance region. In addition, the time of passing through the resonance region in startup and shutdown stages is also reduced by 50 % and 60 %, respectively. This study can provide a new method to improve the vibration isolation performance of vibrating screens.

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Abbreviations

τ :

Shear stress

τ y :

Magnetic shear yield stress

\(\dot{Y}\) :

Shear rate

η :

Dynamic viscosity

v :

Velocity of the piston relative to the cylinder block

h :

Thickness of the damping gap

F s :

Damping force of the MRD in shear mode

D :

Diameter of the piston

L :

Total length of the damping gap

L 0 :

Length of the damping gap

ΔP :

Pressure difference between the two ends of the piston

A P :

Effective area of the piston

Q :

Volume flow rate of MRF between the piston and cylinder barrel

F v :

Damping force of the MRD in flow mode

F x :

Coulomb damping force

F η :

Viscous damping force

F :

Damping force

N :

Turns of the coil

I :

Maximum input current

ϕ :

Magnetic flux

A f :

Area of magnetic induction line flowing vertically through damping gap

B MR :

Magnetic flux density of the MRF in the damper gap

R m :

Equivalent reluctance

l i :

Effective length of each element

μ i :

Magnetic conductivities of each element

A i :

Cross-sectional area of each element

J s :

Current density

A :

Total cross-sectional area of N turns conductor

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51575512, 52074272) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, China

    Mingzhuang Wu, Fei Chen, Aimin Li, Ziye Chen & Nana Sun

Authors
  1. Mingzhuang Wu
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  2. Fei Chen
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  3. Aimin Li
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  4. Ziye Chen
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  5. Nana Sun
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Corresponding author

Correspondence to Fei Chen.

Additional information

Mingzhuang Wu is currently working toward a Ph.D. in Mechanical Engineering at the School of Mechanical and Electrical Engineering, China University of Mining & Technology, Xuzhou, China. His research interests include the design, optimization and control of magnetor-heological dampers.

Fei Chen is a Professor at the China University of Mining and Technology. She received her Ph.D. from the School of Mechanical and Electrical Engineering at China University of Mining and Technology. Her research interests include hydraulic transmission and control, smart structure and system.

Aimin Li is a Professor in the China University of Mining and Technology. He received his Ph.D. from the School of Mechanical and Electrical Engineering at China University of Mining and Technology. His research interests include robot technology in the special environment and energy-saving control of construction machinery.

Ziye Chen is a master of the China University of Mining and Technology. He received his Master’s from the School of Mechanical and Electrical Engineering at China University of Mining and Technology. His research interests include transmission and control of magnetorheological devices.

Nana Sun is a master at the China University of Mining and Technology. She received her Master’s from the School of Mechanical and Electrical Engineering at China University of Mining and Technology. Her research interests include the design, modeling, and control of magnetorheological actuators.

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Wu, M., Chen, F., Li, A. et al. A novel vibration isolator for vibrating screen based on magnetorheological damper. J Mech Sci Technol 35, 4343–4352 (2021). https://doi.org/10.1007/s12206-021-0906-4

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  • DOI: https://doi.org/10.1007/s12206-021-0906-4

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