A Draw works are the primary hoisting machinery that is a component of a rotary drilling rig. Its main function is to provide a means of raising and lowering the traveling blocks. The wire-rope drilling line winds on the draw work drum and extends to the crown block and traveling blocks, allowing the drill string to be moved up and down as the drum turns. The segment of the drilling line from the draw-works to the crown block is called the “fast line”. The drilling line then enters the sheaves of the crown block and it makes several passes between the crown block and traveling block pulleys for mechanical advantage. The line then exits the last sheave on the crown block and is fastened to a derrick leg on the other side of the rig floor. This section of the drilling line is called the “deadline”.
Consist: Drum and shaft assembly, brake system, cathead assembly, transmission assembly, Control system, lubrication system, etc.
|Rating Impute Power hp (kW)||1000(735)||1500(1100)||2000(1470)|
|Max. Fast line Pull lbf.(kN)||61820(275)||76435(340)||109030(485)|
|Dia. of Drill Line in (mm)||1 1/4(32)||1 3/8(35)||1 1/2(38)|
|Drum Size (dia.×width) in (mm)||25.20×44.84 (640×1139)||25.20×51.25 (640×1302)||26.97×44.80 (685×1138)||30.31×53.58 (770×1361)|
|Gears for Hoisting Speed||4+2R||Step-less speed changing||6+2R||Step-less speed changing||6+2R||Step-less speed changing|
|Brake Disc (dia. x thickness) in(mm)||59.06×2.99(1500×76)||63×2.99(1600×76)|
|Main Brake||hydraulic disc brake||hydraulic disc brake, energy- consumption brake||hydraulic disc brake||hydraulic disc brake, energy- consumption brake||hydraulic disc brake, energy- consumption brake||hydraulic disc brake, energy- consumption brake|