| 摘要 |
An opening device for an extension rod drilling equipment, comprising a supporting sleeve (3) rotatably mounted in a frame (1), and gripping jaws (6) displaceably mounted in the sleeve for gripping a drill rod. In order to allow the device to both grip the drill rod and rotate it, the supporting sleeve is connected to a rotating mechanism (14) and provided with cylindrical guideways (4, 5) positioned eccentrically with respect to the axis (A) of the sleeve in such a manner that a rotating movement of the sleeve with respect to the gripping jaws causes a displacement of the gripping jaws towards an aligned rod releasing position and away from the aligned position respectively, depending on the direction of rotation of the supporting sleeve. |
