| 摘要 |
<p>A mobile drilling rig (1) comprising a mast (3), drilling head (5), for sliding, in use, along said mast (3), and at least one hoist (4). Said drilling head (5) is supported by means of at least two hoisting wire ropes (24). The mast (3) is of the telescopic type comprising a main load carrying member (31), for extending said telescopic mast (3), at whose end a plurality of pulleys (26) are provided, on which said hoisting wire ropes (24) slide. Said main load carrying member (31) is adapted to bring said mast (3) from a closed operating configuration to an extended operating configuration and vice versa. The movement of the drilling head (5), when said mast (3) is in the extended operating configuration, takes place by means of said hoisting wire ropes (24), which are pulled and released by said at least one hoist (4).</p> |
