Inlet tube, rock drilling rig and method of sampling
AssigneeSandvik Mining and Construction Oy
InventorsMaunu MANTTARI, Pekka KOIVUKUNNAS, Lasse TUOMINEN, Rami RAUTE
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Abstract
An inlet tube of a sampling device, a rock drilling rig, and a method for taking samples is provided. The inlet tube is mountable to a dust collecting system of a rock drilling rig and is provided with at least one actively controllable homogenizing element forming a physical element for generating disturbance in flow and to thereby homogenize particle distribution of the drilling cuttings in the flow.
Claims8
An inlet tube of a sample taking arrangement of a rock drilling rig, the inlet tube being configured to direct a flow of drilling cuttings and air to a sampling point, the inlet tube comprising:
- a cross-sectional inner shape and dimensions;
- and
- a homogenizing section, wherein an inner cross-section of the inlet tube includes at least one homogenizing element forming a physical point of discontinuity, wherein shape and dimensions of the inner cross-section differ locally from sections prior and after the homogenizing section and which homogenizing element is configured to generate a disturbance in the flow and to thereby homogenize particle distribution of the drilling cuttings in the flow at the section after the homogenizing section and prior to the sampling point, wherein the homogenizing element is an active controllable element providing the homogenizing section selectively with the physical point of discontinuity.
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.
Dependencies are inferred from the claim text.