... fit for the specification of API Spec 4F,7K,8A, Oil Rig Type and Basic Parameters Excellent API drilling rig1. Motorized Rig: ... braking and the Eaton auxiliary braking device. While for hoister, drill pump, and drum, all adopt independent electric driving, infinite ... adopts electromagnetic eddy current device etc, for hoister, drum, drill pump, all adopt unified driving; the derrick adopts A type ...