... of SY/T5609-1999 1. Motorized Rig: To realize the intelligent control the rigs, the rig with DC power driving adopts electric ... adopts hydraulic disc for braking and the Eaton auxiliary braking device. While for hoister, drill pump, and drum, all adopt ... braking devices, the auxiliary breaking system adopts electromagnetic eddy current device etc, for hoister, drum, drill pump, all adopt unified ...