DISPOSITIF DE DEVISSAGE DE TIGES DE FORAGE POUR UNE MACHINE DE FORAGE A TIGES EN PLUSIEURS ELEMENTS

• Main Author: OSSI PAIVALAINEN ET LEO HAKKINEN
• Format: Patent
• Language: French
• Published: 13.01.1984
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

CE DISPOSITIF 5 COMPREND UN MANDRIN D'ACCOUPLEMENT 9 QUI PEUT ETRE COUPLE A UNE PERFORATRICE 1 D'UNE MACHINE DE FORAGE, ET QUI EST MUNI D'UN TROU TRAVERSANT 10 RECEVANT LA TIGE DE FORAGE QU'IL S'AGIT DE VISSER DANS L'EMBOUT SOLIDAIRE DE LA PERFORATRICE, ET DES MOYENS DE SERRAGE 13 MONTES DANS CE MANDRIN. CES MOYENS 13 PEUVENT ETRE ENGAGES EN SAILLIE DANS LE TROU OU MANDRIN, DANS UNE POSITION DE BLOCAGE, POUR BLOQUER LA TIGE EN TRANSLATION AXIALE DANS LE MANDRIN D'ACCOUPLEMENT OU ETRE PLACES DANS UNE POSITION DE DEGAGEMENT. CE MANDRIN COMPREND UNE BAGUE ANNULAIRE INTERIEURE 12 COAXIALE AU TROU TRAVERSANT, QUI SERT A PLACER LE MANDRIN LIBRE EN ROTATION MAIS BLOQUE EN TRANSLATION AXIALE A L'AIDE DE TOURILLONS SUR UN ELEMENT SUPPORT CYLINDRIQUE 25 PREVU SUR LE NEZ DE CARTER 4 DE LA PERFORATRICE 1. A drill rod opening device for sectional-rod drilling equipment, which opening device (5) comprises a coupling frame (9), which can be coupled to a drilling machine (1) of the drilling equipment and which is provided with a through hole (10) for a drill rod to be threaded into a drill rod shank of the drilling machine, and grasping device (13) mounted in the coupling frame. The grasping device are displaceable to a locking position, in which the grasping device extend into the hole in the coupling frame and, lock the rod to the coupling frame, and to a detaching position, in which the grasping device permit movement of the rod in relation to the coupling frame. The coupling frame is provided to be coupled to a front cover (4) of the drilling machine rotably but substantially axially undisplaceably in relation to the drill rod shank. The grasping device are provided to lock the drill rod in the locking position axially undisplaceably to the coupling frame. The coupling frame (9) preferably comprises an internal annular bearing (12) coaxial with the through hole (10 ) for journalling the coupling frame rotably but axially undisplaceably to a cylindrical support element (25) provided in the front cover (4) of the drilling machine (1).