| 摘要 |
A rotary drill and a double-layer drilling rod mechanism are disclosed. The rotary drill comprises a vibration excitation mechanism (1), a rotating mechanism (3) and a flushing mechanism (10). The rotating mechanism (3) consists of a rotary box (8), a driving gear (7), a rotary gear (6) and a rotary connecting sleeve (9). The rotary gear (6) is tightly cased on the rotary connecting sleeve (9) and engaged with the driving gear (7). A connecting rod (2) is provided in the rotary connecting sleeve (9), and the rotary connecting sleeve (9) is connected with the double-layer drilling rod mechanism (11). An impact drilling string (25) located by a guide bearing bush (26) is arranged in the outer rotary drilling pipe (28) of the double-layer drilling rod mechanism (11); a latch (24) for connecting the connecting rod (2) is arranged at the top of the inner impact drilling string (25); and an impact head (12) connected with the impact drilling string (25) is arranged in the drilling bit connecting sleeve (29). The drilling bit (13) below the impact head (12) is connected with the drilling bit connecting sleeve (29) by a front connector (30). Since the impact head is at the bottom of the double-layer drilling rod mechanism and directly acts on the drilling bit, the impact energy generated is not weakened with the lengthening of the drilling rod. Therefore, the rotary drill has the high efficiency of the hydraulic drill and the advantages of good transmission of impact energy and straight drilling of the down-the-hole drilling machine; and furthermore, high impact energy is easy to generate and large-diameter and deep hole rock drilling are implemented. |
