Power tong with reduced die markings

Details Power tong with reduced die markings Power tong with reduced die markings

B - Operations, Transporting

25

B

B25B 13/50 (2006.01)

Patent

CA 2564084

A power tong (10) rotates a tubular during makeup or breakout of the threaded connection. A tong frame (12), a rotatable ring (20), and a cage plate assembly may each have an open throat for receiving the tubular. A plurality of dies (32) are preferentially manufactured from aluminum, and each have a knurled surface for engaging the tubular. A fluid powered cylinder (54) increases tension between the brake band (50) and the cage plate assembly. Neutral cam portions of the cam surface one positioned radially outward substantially from the makeup and breakout cam portions.

Une clé de vissage automatique (10) fait tourner un élément tubulaire lors du montage ou du démontage d'un raccord fileté. Un cadre de clé de vissage (12), un anneau rotatif (20) et un ensemble de plaque de cage peuvent avoir chacun une bouche ouverte destinée à recevoir l'élément tubulaire. Une pluralité de matrices (32) est de préférence fabriquée en aluminium, et chacune possède une surface moletée qui met en prise l'élément tubulaire. Un cylindre (54) entraîné par fluide augmente la tension entre la bande de freinage (50) et l'ensemble de plaque de cage. Des parties neutres de la surface de came sont orientées radialement, sensiblement vers l'extérieur par rapport aux parties de montage et de démontage des cames.

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