DRIVING EQUIPMENT FOR CASING EXCAVATING TYPE EARTH DRILL

摘要

PROBLEM TO BE SOLVED: To optimize the quantity of rotation torque for each of kelly-bar and tube by fixing a casing tube rotating gear to a kelley bar drive shaft and arranging a rotating cylinder having an internal gear interlocking with a planetary gear interlocking with the gear stated above. ;SOLUTION: A kelley-bar drive shaft 19 is rotated and driven by a hydraulic motor 24, and the rotation torque of a casing tube 15 is made higher than the rotation torque of the kelley-bar 14. Then, even though the hydraulic motor 24 is made smaller, it is possible to generate an adequate amount of the rotation torque of the kelley-bar 14 and also of the casing tube 15 respectively. Thus, during excavation work by kelley-bar 14 and during push-in work by the casing tube 15, the transfer of the speed of rotation of the hydraulic motor 24 becomes unnecessary, thereby making the running operation much easier. Also, when performing the excavation work by the kelly-bar 14 and the push-in work by the casing tube 15 at the same time, breaking accidents of the kelly-bar can be prevented. In this way, the work efficiency and total performance can be improved.;COPYRIGHT: (C)1998,JPO