Mechanical Mechanics and Application of High Speed On/Off Valve to Feeding System of Hydraulic Drilling Rig

Feeding pressures control of hydraulic drilling rig is a critical technology of drilling quality. In order to control feeding pressure accurately during hydraulic drilling rigs working, A new feeding system was proposed, based on the cartridge valve controlled by high speed on/off valve. Feeding pressure was exported proportionally via control of high speed on/off valves input PWM signal. Its model was built by AMESim software, to analyze characteristics of the cartridge valve and research the feeding systems response to pressure-commanded signal. The results show that the feeding pressure can be regulated proportionally and the control performance of the feeding pressure can be improved by increasing moderately PWM signals frequency, which provides a reliable reference for further optimization of hydraulic system of drilling rig.