Drawworks

Features of Mechanical Drawworks:

1. All bearings are roller bearings. Shafts of drawworks are made of alloy steel.
2. Chains with forced lubrication can transmit with high accuracy and high strength.
3. Drum of drawworks is grooved. Ventilating air clutches constitute the high and low speed ends.
4. Brake drum (brake disc) is forcedly cooled with circulating water.
5. Drawworks surface is intermediate-frequency quenching-treated, and is durable.
6. Tooth profile of sprocket is intermediate-frequency quenching-treated. Involute-spline-tooth type clutch is used as shifting clutch.
7. Main brake is band brake or disk brake, auxiliary brake is eddy current brake (water-cooled or air-cooled).

Features of AC VFD / DC Motor Drawworks:

1. All bearings are roller bearings. Shafts of drawworks are made of alloy steel.
2. Drum of drawworks is grooved. Ventilating air clutches constitute the high and low speed ends.
3. Main brake of drawworks is hydraulic disc brake. The disc of brake is cooled by water or air.
4. Auxiliary brake is eddy current brake, cooled by water or air.
5. Being shifted though air clutch.
6. Being transmitted through chains.
7. Chains are lubricated forcedly by thin oil, bearings are lubricated by grease.
8. Split construction.

Model		JC40	JC50	JC70
Nominal  drilling  depth,   m	φ 114mm(41/2  ” )  DP	2500-4000	3500-5000	4500-7000
	φ 127mm(5  ” )  DP	2000-3200	2800-4500	4000-6000
Rated  power,   kW  (hp)		735  (1000)	1100  (1500)	1470  (2000)
Max.   fastline  pull,   kN		275	340	485
Dia.   of  drilling  line,   mm(in)		32  (1    1/4  )	35  (1    3/8  )	38  (1    1/2)
Drum  size  (D× L),   mm  (in)		640  × 1235 (25    1/4  × 48    1/2)	685× 1245 (27  × 49  )	770× 1436 (30  × 56    1/2  )
Brake  hub  size(D  × W),   mm(in)		1168× 265 (46  × 10    1/2  )	1270× 267 (50  × 10  1/2  )	1370× 267 (54  × 10  1/2  )
Brake  disc  size  (D× W),   mm(in)		1500× 76 (59  × 3)	1600× 76 (63  × 3  )	1600× 76 (63  × 3  )
Sand  drum  size(D  × L),   mm(in)		356× 1245  (14× 49  )	356× 1430  (14  × 56    1/4  )	356× 1430  (14  × 56    1/4  )
Sand  drum  capacity(with  φ 14.5  wireline),   m(ft)		3500(  11480  )	4500(  14760  )	6000  (  19685  )
Auxiliary  brake		DS40	DS50	DS70
Dimension(L× W× H),   mm		6450× 2560× 2482	7000× 2955× 2780	7930× 3194× 2930
Weight,   kg		28240	45210	43000