l All bearings are roller bearings. Shafts are made of alloy steel;
l Chains with forced lubrication can transmit with high accuracy and high strength;
l The drum is grooved. Ventilating air clutches constitute the high and low speed ends;
l The brake drum(brake disc) is dealt with forced cooling with circulating water;
l The surface case was hardened with medium frequency, and is durable;
l The tooth profile of sprocket was hardened with medium frequency. Involute splines tooth clutch worked as shifting clutch;
l Main brake is band brake or disk brake, the auxiliary brake is eddy current brake (water-cooled
or air-cooled).
Features of DC drawworks:
l All bearings are roller bearings. Shafts are made of alloy steel;
l The drum is grooved. Ventilating air clutches constitute the high and low speed ends;
l The brake is hydraulic disc brake. The disc of brake is water-cooled or wind-cooled;
l The auxiliary brake is eddy current brake, water-cooled or wind-cooled;
l Being shifted though air clutch;
l Being transmitted through chains;
l Chains are lubricated forcedly by thin oil, bearings are lubricated by grease;
l Split construction.