The object of research is vibrational feeders with vibro-impact adaptive drive, the characteristic feature of which is the multifrequency excitation and self-adjusting of the oscillations parameters, including the frequency spectrum, to change the mass of the technological load. The basis of the problem solution is the excitation of vibro-impact oscillations of the working body (tray) of the feeder, at which in its vibration drive the resonant frequency oscillations are realized, the intensity and frequency spectrum of which increase with increasing the technological load on the feeder tray, which distinguishes such vibrators from those used in typical feeders. Vibro-impact systems with such vibro-excitement with parameters and dynamic loading, identical with analogues, have, depending on their purpose, from 3 to 8 times less power consumption, and from 3 to 5 times increase in the intensity of oscillations. At the same time, due to polyfrequency excitation, the mobility of the technological medium that is being processed is improved, which is especially important for the control of freezing and adhesion of materials in the bunkers, or in the pillar of the reflacted rock mass during its output by the vibrating feeders from the chambers of the wining blocks at the underground mining of minerals.

A mathematical model of a vibrating polyfrequency screen as a dynamic system with distributed parameters has been developed. The dynamic system of solids of finite sizes was chosen as the design scheme for the screen: framework, sieves with bulk material and impactors, the contact interaction of which occurs through two-side bonds and collisions on surface areas that have elastic-damping coverings. It is shown that a change in the amplitude of the exciting force has a significant effect on the dynamics of vibration impactors of a polyfrequency vibrating. There is an amplitude value at which the impactor passes from the mode without interacting with elastic bonds to the vibro-impact mode. The impactor movements begin to change disproportionately altered by the exciting force amplitude. It is shown that the start of the impactors in the screen substantially depends on the exciting force. Changes in the amplitude of the exciting force make it possible to achieve chaotic oscillations of impactors, which in turn leads to oscillations of screen surfaces with a continuous frequency spectrum, i.e. to the operation mode of the screen, which is most appropriate for dehydration and separation of fine mineral fractions.

The oscillation modes of vibrating feeders with vibro-impact adaptive drive are researched, which are intended for output and loading of reflacted ore from chambers of wining blocks at underground mining, or other bulk media from bunkers and so on, under complicated vibration conditions. The resonant polyfrequency oscillations of the impactor of the vibro-impact drive of feeders with such drive in vibro-impact modes are excited, which through one-side elastic elements are transmitted to the feeder tray, and in the pillar of the reflacted ore in the chamber above the tray. With increasing load from the ore on the tray there is an increase in the intensity of the impactor vibration of the feeder vibro-impact drive with accelerations in hundreds m/s2. Such oscillations increase the depth of dissemination of vibrational effects in a pillar of reflacted ore above the tray, which increases the efficiency and productivity of vibration output. Depending on the feeders parameters in its oscillatory system, various modes of vibro-impact oscillations are excited. The task of choosing the mode of variation of the feeder is to choose such parameters, which would ensure efficient vibration output of the rock mass and reliability of its operation.