| 摘要 |
<p>A device for a power tong (1) for unscrewing or screwing a pipe (6) comprising a tong housing (2) with a radial opening for moving the pipe (6) into or out of the power tong (1), at least one driving motor (40, 52) with associated transmission elements (61), and a tong portion (39) including at least one gripper (24), the at least one driving motor (40, 52) being arranged to rotate the tong portion (39) with the at least one gripper (24) about a centre axis (4), and the tong portion (39) comprising an arm case (8) with a radial arm case opening (17) and a step case (28) with a radial step case opening (37), a first driving motor (40) being coupled the to the arm case (8) and releasably coupled to the step case (28) by means of transmission elements (61), and a second driving motor (52) being coupled to the step case (28) and releasably coupled to the arm case (8) by means of transmission elements (61).</p> |
