A source of power that drives the drilling pipe to rotate, the drilling rig rotary head is powered by a hydraulic system, and it is strong and the rotation torque is bigger than the motor power drilling rig rotary head. At the present most of the manufacturers in China use the hydraulic rotary head for making a water well drilling rig because it is can produce enough torque for drilling into the earth, it is better than the motor rotary heads.
A water well drilling rig is usually equipped with a hydraulic power head, and it is strong. The drilling rig rotary head or power head consists of the hydraulic motor, and gearbox. The hydraulic motor powers the hydraulic system and this mechanism transfer the rotation power to a drilling bit through drilling pipes. The motor of the hydraulic drilling rig rotary head is the variable motor, the variable motor transfers the power into the gearbox. The gearbox drives the rotary head to rotate. The hydraulic power head is used for oil drilling rigs, water well drilling rigs, and rotary drilling rigs.
The advantages of a hydraulic power head are that it can drill big diameter boreholes and can drill very deep, and it is very stable for drilling a water well borehole. The best suggestion is to buy a water well drilling rig with a hydraulic rotary head and it drills through a rock layer formation with ease.