SANY SR220C SR Series Full Hydraulic Rotary Drilling Rig 

SANY Rotary Drilling Rig SR220C 

5-level anti-vibration technology absorbs drilling vibrational frequency all- directionally to guarantee high stability;
The special lubricating system makes sure that it can work in hightemperature environment. Rotary drive is available in three drilling
modes---standard, low speed and big torque or high speed and small torque; spin-off is optional;
The removable key of rotary drive and symmetry structure design double its service life;
The main winch has highlights of touch-bottom protection, priority control and fast line speed;
Crowd cylinder has two operation modes---normal lifting and fast lifting to improve push efficiency;
Mast features automatic erecting, lying and vertical adjustment to ensure the accuracy requirements in construction; Balance control system of the whole machine is available.