| 摘要 |
FIELD: mining.SUBSTANCE: bore bit comprises an adapter connected with three concentrically installed tubular elements, end surfaces of which are reinforced with rock-breaking elements. The central tubular element is installed with the possibility of axial displacement and made with radial longitudinal slots, where stop pins are placed, which fix it relative to the inner and outer tubular elements. Rock-breaking elements of all tubular elements are installed at different angles to the vertical plane.EFFECT: higher efficiency of crown operation.3 cl, 3 dwg |
