DYNAMIC BRAKING OF THE INERTIAL VIBRATOR OF VIBRATORY PLATES FOR CONCRETE MIXES COMPACTING

Abstract

Introduction. The production of precast concrete compaction of concrete mixtures is most often carried out on vibration platforms with the use of additional cantledge. Equipment operation is carried out in the mode, in which the oscillation frequency is higher than the resonant. With the turning on the vibration exciter, the entire system (vibration platform, product shape, etc.) passes through the resonance, which is accompanied by increased vibration amplitudes.Materials and methods. The authors applied the experimental method of the research of the dynamic braking process of the inertial vibrator. The parameters of the deceleration and oscillation of the desktop were recorded by the computer monitoring installation.Results. The ending of the product compaction process is characterized by increased oscillation amplitudes of the desktop. At the same time, air could be sucked into the product and the lamination of the mixture could take place, which adversely affects the quality. This effect is observed with the vibrator turning off. To reduce the negative phenomena from the passage of resonance, especially at the end of the sealing cycle when the product is already formed, quickly stopping of the vibration exciters of the technological installation could be applied. The paper presents the results of experimental studies of various methods of the vibrator rotors braking. The authors give comparative characteristics of the braking process.Discussion and conclusion. The authors give recommendations on the use of the most effective braking schemes of the inertial vibrator.

Keywords

• concrete
• precast reinforced concrete
• vibration platform
• vibrator
• amplitude of oscillations
• sealing
• vibrator braking