Design Features of Mechanical Driven Drawworks:
▋Bearings are rolling ones and shafts are made of alloy steel.
▋Chains with high accuracy and high strength are pressure lubricated.
▋On the drum there is a spiral groove. The low-speed & high-speed ends of drum shaft are equipped with a ventilating air tube clutch. The brake rim (or disc) is water cooled and the surface is intermediate frequency quenched, which provides long service life.
▋The contours of the sprocket teeth are intermediate frequency quenched. All clutches of shifting gears are of involute spline type.
▋The main brake can be either a band or disc brake system. The auxiliary brake can be realized by an eddy current brake (water or air cooled)
Basic Specifications of Mechanical Driven Drawworks:
| Model | JC40 | JC50 | JC70 | ||
| Nominal drill depth | m | Ф114mmdrill pipe | 2500-4000 | 3500-5000 | 4500-7000 |
| Ф127mm drill pipe | 2000-3200 | 2800-4500 | 4000-6000 | ||
| Rated power | kW (hp) | 735 (1000) | 1100 (1500) | 1470 (2000) | |
| Max. pull of fast line | kN | 275 | 340 | 485 | |
| Dia. of wire line | mm (in) | 32 (1 1/4 ) | 35 (1 3/8 ) | 38 (1 1/2) | |
| Band brake Drum(Dia.× Length) | mm (in) | 640 ×1237 (25-1/4×48-3/4) | 685×1245 (27 ×49 ) | 770×1439 (30 ×56-5/8 ) | |
| Brake rim (Dia.× width) | mm (in) | 1168×265 (46 ×10-1/2 ) | 1270×267 (50 ×10-1/2 ) | 1370×267 (54 ×10-1/2 ) | |
| Disc brake Drum(Dia.× Length) | mm (in) | 640×1139 (25-1/4 ×44-7/8 ) | 685×1138 (27 ×44 7/8) | 770×1361 (30×53 5/8) | |
| Drake disc (Dia.× width) | mm (in) | 1500×76 (59 ×3) | 1600×76 (63 ×3 ) | 1600×76 (63 ×3 ) | |
| Auxiliary brake | DS40 | DS50 | DS70 | ||
| Overall dimension (L×W×H) | mm | 6450×2560×2482 | 7000×2955×2780 | 7930×3194×2930 | |
| Weight | kg | 28240 | 45210 | 43000 |