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Vibrating screen equipment will resonate through the resonance zone during start and stop process, thus affecting the service life and reliability of equipment. The traditional passive isolator cannot adjust the stiffness and damping according to the actual working state of the vibrating screen due to its own fixed parameters, resulting in unsatisfactory vibration isolation effect^[1,2]. According to the variable stiffness and damping characteristics of electrorheological elastomer (ERE) ^[3,4], a new type of shear-squeeze mixed mode electrorheological elastomer isolator is designed. At the first step, the EREs used for the isolator was prepared, and the dynamic viscoelastic properties were measured. After that, the structure of ERE isolator was designed, and the vibration isolation effect of the ERE isolator for vibrating screen was analysed by simulation. The simulation results demonstrate the resonance amplitude and stopping time of the vibrating screen in startup and shutdown stage will decrease with the ascending electric field strength. Finally, the shear-squeeze mixed-mode ERE isolator was tested on electro-dynamic shaker. The experimental results indicate that the ERE isolator has a better effect of vibration reduction with increased electric field strength in startup and shutdown stage of vibrating screen, and the acceleration transmissibility by ERE isolator is reduced 37.6% under 3 kV/mm.

Electrorheological elastomer,vibration isolator,shear-squeeze mixed mode,vibration reduction