| 摘要 |
<p>Provided are a cathead and a rotary drilling rig. The cathead comprises a pulley (1), a cathead basal body (2), and a mounting seat (3), the pulley (1) is mounted on the mounting seat (3), a mounting portion is arranged on the cathead basal body (2), the mounting portion comprises multiple connecting structures, and the mounting seat (3) is selectively connected to different connecting structures of the mounting portion, to be fixedly mounted at different positions of the cathead basal body (2). In this way, when a case where the distance between a drilling rod (9) and a mast (8) needs to be adjusted occurs to the rotary drilling rig, the distance can be adjusted by only adjusting the mounting position of the pulley (1) on the cathead instead of replacing the cathead with a cathead in other sizes. Compared with the manner of replacing the cathead, the workload of dismounting and mounting is greatly reduced, the cost is lowered, and the operation is convenient and fast.</p> |
