| 摘要 |
The invention concerns a drill rig 10, 70, 100 which includes an extendable thrust cylinder 14 and an extendable clamping cylinder 12. The clamping cylinder 12 is used for clamping the drill rig between a floor and hanging wall of a mine working. To ensure that the drill rig is compact, the clamping cylinder 12 is mounted inside the thrust cylinder 14. The drill rig further includes a drill carriage 24 which is slidably connected with respect to the thrust cylinder 14 and moveable in a carriage movement direction substantially parallel to the axes of extension and contraction of the cylinders 12, 14. The carriage 24 is configured to carry a drill in use. A flexible, mechanical coupling 26 is provided between the drill carriage 24 and the thrust cylinder 14 so that extension and contraction of the thrust cylinder causes the drill carriage to move in the drill carriage movement direction. The mechanical coupling 26 is configured to provide an amplitude advantage so that the distance of travel of the drill carriage 24, and hence of a drill carried by the drill carriage in use, is greater than the extension of the thrust cylinder 14. |
