DRAWWORKS Russian patent published in 2006 - IPC B66D1/24 E21B3/06 F16H29/04 

FIELD: oil producing industry.

SUBSTANCE: invention relates to drilling of deep oil and gas wells and it can be used in lifting complexes and drawworks of electrified drilling rings. Proposed drawworks contains drum, gearbox, belt and auxiliary brakes, main and emergency drives. Gearbox is made in form of variable-speed drive with spherical converting mechanism with rocking holder. Holder trunnions are furnished with overrunning clutches and bevel gears. Said bevel gears are in meshing with bevel wheel. Extension of said wheel is driven shaft of variable-speed drive. Inner ring of converting mechanism is hinge-connected by guide with bushing installed for movement on drive shaft. Radial-thrust bearing is fitted on bushing. Bearing has additional outer bushing with brought out lever. Driven shaft of variable=speed drive and shaft of drum are arranged in parallel relative to each other and are mechanically intercoupled by chain drive. Driven shaft is connected additionally with emergency drive by pneumatic clutch.

EFFECT: simplified design, provision of stepless control of drum speed, dispensing with complex, bulky expensive and insufficiently reliable electric drive with thyristor controls.

2 cl, 2 dwg