METHOD FOR CHARGE DISPERSAL IN HOLE Russian patent published in 2010 - IPC F42D1/08 

FIELD: blasting.

SUBSTANCE: invention is related to mining and may be used to charge blast holes in process of blasting performance. Method for dispersal of charge in blast hole includes creation of air gaps with the help of pneumatic well sealer, diametre of which exceeds well diametre. Sealer is placed into bag, transverse dimension of which is more than well diametre, is freely fastened in bag, compressed till transverse dimension that is less than diametre of well, lowered into well onto connector tube to a specified depth, which is adjusted with the help of connector tube. Sealer is pumped with air till specified pressure, connector tube is separated from pneumatic well sealer and is extracted from well. Primed cartridge and part of charge are placed onto sealer. The next pneumatic well sealer is lowered as compressed on the same connector tube to a specified depth, and the whole sequence of actions is repeated to achieve economically and technically justified number of pneumatic well sealers in a well. As pneumatic well sealer they use toroid leak-tight inflatable chamber with nipple, outer diametre of which exceeds well diametre.

EFFECT: invention makes it possible to disperse charge in wells of any diametre and to reduce charging prime cost.

2 dwg