... 2) Adopting AC VF motor drive, the drawworks , rotary table and mud pump achieves stepless speed regulating function ... working s tatus of mechanical, electric, hydraulic and pneumatic implements, failure alarm and failure self-diagnosis has ... .55 or 5.57.5910.5Clearance height under rotary beam, m 2.6 or 3.33.8 ... oneOil drilling rig/mobile drilling rig/rotary drilling rigDrilling rig,mobile drilling rig ...