Reducing the load of the elastic support of the resonance vibrating conveyor machines

Anatoliy Il'ich Afanas'ev, Valentin Yakovlevich Potapov, Dmitriy Nikolaevich Suslov, Alena Anatol’evna Chirkova

A. I. Afanas'ev, V. Ya. Potapov, D. N. Suslov, A. A. Chirkova / News of the Ural State Mining University 1 (2018) 85–88 DOI 10.21440/2307-2091-2018-1-85-88

The relevance of the work is conditioned by the necessity of improving the efficiency of vibrator machines. This is done by means of increasing the reliability of the elastic reference elements.

The purpose of the work is to develop a dynamic resonance system of the vibrator machine with a reduced mass of the working body and loads on elastic supports. The resonance vibrator machines appeared in the USSR in the mid-twentieth century. They were used in the coal industry. The machines of foreign production and some of the domestic machines are now produced according to the balanced scheme. Domestic machines of the "PEV" series are made according to the vibro-isolated scheme, and the vibro-exciter is rigidly connected to the box. The resonant oscillation frequency of these machines is 50 Hz, and the maximum acceleration is significantly greater than the one of free fall. These resonant machines operate with the amplitude up to 2.2 mm and they have a ratio mode greater than unity. The practice of running these machines shows their relatively low efficiency when screening thin products. The common disadvantage of unbalanced resonance vibrator machines is a relatively large loading of elastic elements (supports) and the presence of a massive frame. The disadvantage of the balanced ones is the reactive mass or several working bodies with the same mass. One of the ways to achieve the goal is to define a rational dynamic scheme of the resonance vibrator machines.

The results and their application. The authors proposed to transform a traditional one-mass oscillatory system into a system equivalent to a dynamic vibration dampener. This system can significantly reduce the weight of the machine. It can reduce the rigidity and loading of the elastic supports at a given frequency of oscillations. The upper mass can be reduced by 2 or 3 times, and the lower mass can be several times smaller than the upper one. At the same time, the dynamic loads on the supports of the lower mass will be close to zero, since it almost does not oscillate. Thereby it is possible to significantly reduce the rigidity of the elastic supports, i.e. their mass and loading, as well as the total mass of the screen and the cost of its manufacture.

Keywords: vibration resonant machines; angular frequency and amplitude of oscillations; acceleration; mass; stiffness of supports; vibration exciter.

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