PERFORATOR Russian patent published in 2007 - IPC E21B1/38 

FIELD: mining and construction industries.

SUBSTANCE: invention can be used for drilling bore holes in any rocks with hard inclusions, for instance, apatite nepheline ore. Proposed perforator contains rock breaking tool-bar with crow bit, housing accommodating rotary mechanism and twin hammer consisting of main and auxiliary strikers, air distributing system, rotary and end boxes. Auxiliary striker is installed in guides. Its section has from of polyhedron, and ratio of striker length L to its width b is chosen from L/b>1.5. Ratio of masses of twin hammer and bar should satisfy condition m₂>m₁(2R+R²).

EFFECT: increased efficiency of impact.

6 dwg