FIELD: rock-cutting tools of drilling equipment, in particular, roller-cutter drilling bits with devices for protection of bit bearings from cuttings in drilling of blast holes. SUBSTANCE: roller-cutter drilling bit has installed in central hole check valve in the form of flexible tubular member with joint flange, shutoff part made in the form of flat slotted member whose flow area is overlapped by side surfaces and intermediate part made with two flat surfaces located at an acute angle with diametrically opposite to central hole axis. Flat surfaces of shutoff part in outlet hole are made by two diverging surfaces at an angle equalling the taper angle of discharge flow and interconnected by two opposite side surfaces. EFFECT: higher efficiency and service life of check valve due to change of design and conditions of passage of blowing agent. 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| BOREHOLE REAMER | 0 |
|
SU1698414A1 |
| CONE DRILL BIT | 1994 |
|
RU2078898C1 |
| DRILLING BIT | 1995 |
|
RU2098596C1 |
| CONE DRILL BIT | 1999 |
|
RU2181157C2 |
| ARRANGEMENT FOR PROTECTING FROM SLIME AND LUBRICATING THE BEARINGS OF ROLLER BIT | 0 |
|
SU1231202A1 |
| SPHERICAL CHISEL LUBRICATION AND DEFENSE FROM RESIDUES UNIT | 0 |
|
SU1694846A1 |
| DEVICE FOR ROLLING CUTTER BIT BEARING SLUDGE PROTECTING AND LUBRICATING | 0 |
|
SU1761936A1 |
| DEVICE FOR SLURRY PROTECTING AND GREASING OF CONE DRILL BIT | 0 |
|
SU1806256A3 |
| ROTARY BIT | 0 |
|
SU947380A1 |
| CONE DRILL BIT | 1992 |
|
RU2034127C1 |
