E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/16 (2006.01)
Patent
CA 2414091
The invention relates to a method of opening joints of drilling components attached to a rock drill, and to a rock drill which enabling this. According to the idea of the invention, in striking compression stress, which proceeds towards a drill bit (10), is generated in the drilling equipment (5) by striking with a percussion piston. When the drilling components are struck off, the axial bearing included in the drilling machine does not substantially support the drilling equipment, but the compression stress generated by striking is reflected from the drill bit (10) as stress of the opposite sign and generates the desired tensile stress in the drilling equipment. After striking the threaded joints of the drilling components can be opened easier by rotating the rotating device in the opposite direction.
L'invention concerne un procédé pour séparer les joints entre les composants de forage fixés à une perforatrice de roches ainsi qu'une perforatrice de roches permettant la mise en oeuvre de ce procédé. Selon l'invention, en frappant avec un piston de percussion, on génère dans l'équipement de forage (5) une contrainte de compression dirigée vers une pointe de forage (10). Lorsque les composants de forage sont détachés par frappage, le roulement axial compris dans la machine de forage ne sert sensiblement plus de support à l'équipement de forage; cependant la contrainte par compression due au frappage est réfléchie depuis la pointe de forage (10) comme une contrainte de signe opposé et génère dans l'équipement de forage une contrainte de traction désirée. Après frappage, les joints filetés des composants de forage peuvent être séparés aisément par la rotation du dispositif de rotation dans la direction opposée.
Muuttonen Timo
Salminen Pekka
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
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