Underground hopper

UNDERGROUND HOPPER (EN: underground bunker; DE: Tiefbunker; FR: silo souterrain, trémie souterraine; ES: tolva subterranea; RU: бункер подземный) is the underground mine working for the accumulation (short-duration storage) of the useful mineral or rock; the hopper situates near the shaft of the underground mine, and ensures the steady work of the skip hoisting. The underground hopper is adjacent, by its upper part, to the chamber, where is installed the toppling device for the unloading of the train of the minecarts. At the lower part of the underground hopper, there is situated the measuring chamber with the feeder for the loading of the skip. At the underground mines of the great productive capacity, where there exist in operation several horizons, there are constructed above the underground hopper the chambers for the crushing installation, for the dust suppression, and the distribution funnels, while under the underground hopper there is constructed the chamber for the cleaning.

According to the design, the underground hoppers are divided into vertical and inclined. Vertical underground hoppers are of the cylindrical shape, with the diameter of 4-7 metres; the lining is made of concrete with the thickness of 0.3-0.5 metres. The inclined underground hoppers have the conical shape, with the area of the cross section of 4-10 square metres. The lining of the underground hopper is also made of concrete (with the thickness of 0.3 metres), with the flat ceiling, which is made of the I-beams, with the intervals of 0.7-0.8 metres. The underground hopper has the compartment for the passage of the people, the volume capacity of the underground hopper for coal is not less than the volume capacity of the two locomotive trains, the volume capacity for the rock is determined by the project.