ORE CHUTE Russian patent published in 2007 - IPC E21F13/04 

FIELD: mining industry, possible use during underground extraction of mainly ore formations and kimberlite pipes.

SUBSTANCE: ore chute is provided with elastic, closed covers positioned pair-wise along the height of ore chute shaft and filled with compressed air. They are held on armored hermetic cable for feeding compressed air and on rope. Cover pairs adjacent height-wise are positioned transversely to each other. Diameter d of cover is selected from inequality d>0,5D, where D - diameter or transverse diameter of ore chute. Distance between adjacent pairs of covers vertical-wise along height h is calculated from formula h=10+1/d_p, where d_p - average diameter of rock mass piece, meters.

EFFECT: decreased degree of size reduction of rock mass, decreased costs of major repairs of ore chute, reduced speed of rock mass during transfer through ore chutes of practically any height.

2 dwg