E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/35
E21B 15/04 (2006.01)
Patent
CA 1167026
ABSTRACT A method for aligning the drill stem and bit of a rock drill rig when starting the drill wherein the applied feeding power on the drilling machine of the rig has results in deflection of the direction of the drill stem by deformation of the articulated and extensible drill boom of the rig and of the pivotally supported drill support on the drill boom. The drill rig is of the type which comprises elements for measuring boom lengths and articulation angles, servo means for controlling the lengths and angles and a control unit connected to the measuring elements and servo means for adjusting the drill stem and bit. The various articulation angles which are required to compensate for deformation of the drill boom and drill support are determined as if the drill boom and support were in unloaded condition, using measured values of the boom lengths and articulation angles, set in the control unit in unloaded condition. The adjusted articulation angles are corrected to the determined articulation angles when feeding power is applied. Thus, the drill stem and bit become correctly positioned and directed in the loaded condition also. Apparatus for carrying out the method may comprise a computing device including a mathematic model with a definition of the changes for the articulation angles.
401884
Bjor Hdkon E.
Borden Ladner Gervais Llp
Ingeniýr Thor Furuholmen A/s
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