MOVEMENT REGIMES OF THE LIFTING GEAR OF A DRILLING RIG.

One of the most loaded mechanisms of the drilling rig is a lifting gear. Its perfection and reliability decrease time of the trip and in such a way increase the effectiveness of drilling rig operation. Insufficient calculation of movement and burden characteristics of the lifting gear brings to violation of power drive energy resources and law of resistance, laid in mechanism component, or to the overload and falling out of main components and parts and as a result there may be a decrease of the work effectiveness of the whole drilling rig. Analytical model of the lifting gear of the drilling rig is shown on pict.1. There is depicted the following: I1 – brought out to the drawworks drum shaft inertia moment of the movable parts of the drive, I2 – brought out inertia moment of the drawworks drum and movable parts of the block-and-tackle system, I3 – brought out inertia moment which includes mass of string of pipes and floating block, MM – the moment of the tyre-pneumatic socket (coupling), c23 – brought out rope rigidity of block-and-tackle system and string of pipes, MT-braking torque. Taking into consideration the fact that the engine works, the mass I1 rotates with the angular speed ω10. By turning on the tyre-pneumatic socket (coupling) we move drawwork