... down (crown and RT protection) . The drawworks is a structure with single shaft, gear transmission, stepless speed regulating, the ... hydraulic disk brake and dynamic brake together, with simple structure and reliable performance.with the online monitoring system for ... driveElectric control modeAC-DC-ACone to onedrilling rig,oil drilling rig,drill rig,rig,driling machine,oil rig,OIL DRILLING RIG