DRAW-WORKS OF DRILLING RIG Russian patent published in 1997 - IPC

FIELD: drilling equipment. SUBSTANCE: draw-works is used for round-trip operations in drilling rigs. Gearbox of draw-works is made in the form of two epicyclic systems with their sun gears installed on driving shaft of gearbox. Crown gear of first epicyclic system is fixed in gearbox housing. Carrier with pinions of this system is connected with driven shaft through crown gear of second epicyclic system which is hollow and installed concentrically to driven shaft which is connected with carrier and pinions of second planetary system. Both driven shafts are rigidly connected with pulleys of pneumatic-tyre type couplings connected with drum shaft and which can alternately interact with pulleys. This draw-works is small in dimensions and sufficiently reliable in operation. EFFECT: high efficiency. 1 dwg