The braking device on the drawworks to stop a load being lifted.

Crown Block
An of sheaves or pulleys mounted on beams at the top of the derrick. The drilling line is run over the sheaves down to the hoisting drum.


Brief Introduction Drawworks is the core part of Drilling Rig. It is used for of or laying down mast, hoisting or descending drilling tools and casings.

Technical performances and structure features

• All bearings are rolling bearings . The shafts are made of alloy steel.
• The chains are pressure lubricated.
• The drum is grooved. The low-speed & high-speed ends of the drum shaft are equipped with ventilating pneumatic tube clutch. The brake rim (or disc) is water cooled and the surface is medium-frequency induction hardened that provides excellent wear-capacity and long service life.
• The contours of the sprocket teeth are medium frequency induction hardened. All transmission clutches are of involute spline type.
• The main brake is hydraulic disc brake, and the auxiliary brake is electromagnetic eddy current brake or EATON brake.Technical Performances and Structure Features of the Single-shaft Electric Drawwork.
• The drawwork is single-shaft with grooved drum structure, has less spare parts, small cubage, light weight compared with the products of the same kind.
• The drum shaft is driven by the gear reducer which power originate from a DC or AC-VF motor,it can also be driven by compound operation of two motors. AC-VF motor make the drawworks has a wider timing scope, the speed can be egulate smoothly between 0-140Hz.
• High transmission efficiency gear, small oscillation, low noise, long service life.
• The main brake of the is hydraulic disc brake while the auxiliary brake is energy- consumption brake or EATON brake.
• The drawworks is equipped with independent numerical-control AC-VF transmission device and automatic control system(ACS),it can feed bit ; Real-time monitoring and analysising of bit feeding and infixing, get the optimal drilling.


A set of clamps that grips a stand, or column, of casing, tubing, drill pipe, or sucker rods, so the stand can be raised or lowered into the hole.


 A large, hook-shaped device from which the elevator bails or the swivel is suspended. It is designed to carry maximum loads ranging from 100 to 650 tons and turns on bearings in its supporting housing.


A rotary tool that is hung from the rotary hook and traveling block to
suspend and permit free rotation of the drill stem. It also provides a connection for the rotary hose and a passageway for the flow of drilling fluid into the drill stem.