Land Rigs - VFD Drilling Rigs
● The drawworks is driven by two VFD AC motors with 1+1R/2+2R step-less speed, and reversal will be realized by AC motor reversal.
● The mud pump is driven by VFD AC motors, which are mounted on the rear skid of mud pump, with V-belt transmission and simple structure.
● The independent driven rotary table runs with 1+1R/2+2R step-less speed, and reversal will be realized by AC motor reversal.
● Using AC-DC-AC drive technology, rotary table and drawworks are four quadrant running and full digital vector control.
● Single drum, gear driven and one / two shifts smooth speed change drawworks is simple in structure and reliable in operation.
● Feed back / Dynamic brake is adopted to replace eddy current brake as auxiliary brake.
● Automatic drilling is obtained by drawworks main motor or an independent motor. Intellectual position control for traveling block prevents crown block and rotary table from collision.
● Real time communication and network is available by using PROFIBUS technology.
● K type mast is suitable for install top drive system.
● Sling shot or swing up substructure and mast are applied so that all the equipment can be installed at lower.