Abstract
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.
Highlights
At the underground mining of minerals for the output and loading of reflacted ore from the chambers of winings blocks through the outlets, vibrating feeders are used [1,2,3,4,5,6,7,8,9]
Such vibration feeders are subject to high requirements for the strength and reliability of the construction, since they operate in conditions of bulk, under heavy load from ore, and from explosions at the destruction of oversized pieces of the rock mass and the elimination of its freezes in the chamber, as well as significant shock loads from pieces falling on the feeder tray
The essential disadvantage of such systems is to reduce the intensity of vibration excitation of the feeder tray with increasing load on it from the pillar of the reflacted rock mass in the chamber
Summary
At the underground mining of minerals for the output and loading of reflacted ore from the chambers of winings blocks through the outlets (hollows), vibrating feeders are used [1,2,3,4,5,6,7,8,9] Such vibration feeders are subject to high requirements for the strength and reliability of the construction, since they operate in conditions of bulk, under heavy load from ore, and from explosions at the destruction of oversized pieces of the rock mass and the elimination of its freezes in the chamber, as well as significant shock loads from pieces falling on the feeder tray. This allows to reduce the probability of occurrence of ore freezing in the chamber and to increase the vibration output Such requirements correspond to vibrating feeders with vibro-impact adaptive drive [1], which are double-mass dynamic systems, which are connected with each other by two-side and one-side elastic bonds, which are installed between the feeder tray and the vibro-impact drive impactor, on which the debalanced vibrator is fixed. An increase in the level and depth of vibration dissemination in the massive of reflacted ore, the static equilibrium bonds destruction and the adhesive forces and friction between the pieces of reflacted ore reduction is provided
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