In oil drilling operation, as one of the core equipment, the performance and stability of oil drilling rig directly affect the drilling efficiency and safety. As a key control element in hydraulic system, servo valve undertakes the important task of regulating flow and pressure and controlling the action accuracy of actuator. Therefore, how to adjust the servo valve correctly is an important link to ensure the normal operation of the drilling rig.
First, the
basic role of servo valve
Servo valve is a kind of hydraulic control valve with high precision and fast response, which is widely used in the hydraulic control system of oil drilling rig. Its main functions include: controlling the flow and direction of hydraulic oil, adjusting the system pressure, and realizing the precise action of actuators (such as hydraulic cylinders and hydraulic motors). Servo valve plays an important role in the lifting system, rotating system and mud circulation system of drilling rig.
Second, the necessity of servo valve adjustment
Due to the complex drilling environment and the long-term operation of the hydraulic system under harsh conditions such as high pressure, high temperature and vibration, the servo valve may have problems such as slow response, inaccurate flow control and pressure fluctuation. This not only affects the efficiency of the drilling rig, but also may lead to equipment damage and even safety accidents. Therefore, it is particularly important to detect and adjust the servo valve regularly.
Three, the basic steps of servo valve adjustment
1. Check the system status
Before adjusting the servo valve, check the running state of the whole hydraulic system to ensure that the oil is clean, the oil temperature is normal and the system has no leakage. At the same time, confirm that the electrical connection and feedback signal of the servo valve are normal.
2. Set the initial parameters
Set the initial control parameters of the servo valve, such as flow gain, dead zone compensation, pressure limitation, etc., according to the rig manual and field working conditions.
3. Adjust the zero point and
gain
Use special debugging equipment to calibrate the servo valve at zero point, so as to ensure that the valve core is in the middle position and moves without error when there is no input signal. Then adjust the gain to match the response speed of the spool with the control system.
4. Test the dynamic response
By simulating the load change, the action response of the servo valve and the stability of the system are observed. If oscillation or response lag occurs, the damping or feedback parameters should be adjusted appropriately.
5. Carry out load test
After the preliminary adjustment is completed, the drilling rig should be operated under the actual load condition, and the working state of the servo valve and the action accuracy of the actuator should be monitored to ensure that the design requirements are met.
6. Records and maintenance
After each adjustment, the adjustment parameters should be recorded to facilitate future maintenance and troubleshooting. At the same time, make regular maintenance plan to extend the service life of servo valve.
Fourth, matters needing attention
-Adjusting the servo valve should be operated by technicians with professional knowledge and experience.
-Use special tools and test instruments to avoid blind adjustment.
-Pay close attention to the changes of system pressure and temperature during adjustment to prevent overload.
-If the servo valve is found to be seriously worn or out of control, it should be replaced in time.
V. Conclusion
As the “nerve center” in the hydraulic control system of oil drilling rig, the adjustment accuracy of servo valve directly affects the performance and safety of drilling rig. Through scientific and standardized regulation process, not only can drilling efficiency be improved, but also the service life of equipment can be effectively extended and the failure rate can be reduced. Therefore, strengthening the daily maintenance and professional adjustment of servo valves is one of the key measures to ensure the stable operation of oil rigs.