US 12,173,570 B2
Inlet tube, rock drilling rig and method of sampling
Maunu Manttari, Tampere (FI); Pekka Koivukunnas, Turku (FI); Lasse Tuominen, Oulunsalo (FI); and Rami Raute, Turku (FI)
Assigned to Sandvik Mining and Construction Oy, Tampere (FI)
Filed by SANDVIK MINING AND CONSTRUCTION OY, Tampere (FI)
Filed on Jun. 29, 2023, as Appl. No. 18/216,268.
Prior Publication US 2024/0003207 A1, Jan. 4, 2024
Int. Cl. E21B 21/07 (2006.01); E21B 21/015 (2006.01); E21B 49/08 (2006.01)
CPC E21B 21/07 (2013.01) [E21B 21/015 (2013.01); E21B 49/086 (2013.01)] 7 Claims
OG exemplary drawing
 
5. A method of sampling in a rock drilling rig, the method comprising:
drilling drill holes in a rock surface;
collecting produced drilling cuttings from an opening of the drill holes during the drilling by a dust collecting system;
taking samples of flow containing air and drilling cuttings at a sampling point of the dust collecting system during the drilling;
providing the dust collecting system with an inlet tube before the sampling point; and
changing actively a cross-sectional inner shape and dimensions of the inlet tube locally for spreading drilling cutting particles in the flow evenly across the inner cross-section of the inlet tube, whereby the samples are taken downstream of the mentioned particle spreading.