TY - JOUR
AU - Alekseev, SE
AB - Downhole pneumatic drill tools developed in Russia are widely used in blasthole drilling [1]. Percussion drilling consumes less energy in breaking medium-hard and very hard rocks, enables saving power of performance and allows using lighter equipment. Such drilling tool are highly productive reliable and simply maintained. Drilling rate is independent of the hole length, which allows long-hole drilling to be carried out in underground mines. It is also possible to drill larger diameter (to 350 mm) holes using lighter equipment. Al that combined with the simplicity and relatively low price make these machines popular both in open pit and underground mining. A feature of down-the-hole drill hammers is that their length and diameter are strictly limited by the diameter of a hole or the size of an underground opening. Efficiency of drilling in medium-hard and very hard rocks depends on the value of blow energy A given by: A = p ·F·s , av p where p is the average pressure in the power stroke chamber before exhaust; F is the effective area of av impact piston on the side of the power stroke chamber; Saint-Petersburg is the impact piston travel length determined as the distance between the total 
TI - Down-the-hole hammering machines for blasthole drilling
JF - IOP Conference Series: Earth and Environmental Science
DO - 10.1088/1755-1315/134/1/012048
DA - 2018-03-01
UR - https://www.deepdyve.com/lp/iop-publishing/down-the-hole-hammering-machines-for-blasthole-drilling-fJ00mJapB0
SP - 012048
VL - 134
IS - 1
DP - DeepDyve
ER -