Servo valve is the core control element in the hydraulic system of modern mining machinery, and its performance directly affects the working efficiency, accuracy and reliability of the equipment. Due to the harsh working environment in the mine, the equipment is in a state of high strength, high vibration and high dust for a long time, and the servo valve is easily polluted, worn or even damaged. Therefore, strengthening the protection and maintenance of servo valves is an important guarantee to prolong the service life of mining machinery and improve production efficiency.
First, the role and importance of servo valve in mining machinery
Servo valve is a kind of high-precision hydraulic control valve, which can accurately control the flow and pressure of the hydraulic system according to the input signal and realize the high-precision control of the actuator. In mining machinery, servo valves are widely used in hydraulic excavators, drilling rigs, crushers and other key equipment, and are the key components to realize automation and intelligent control. The normal operation of servo valve is very important for the response speed, control accuracy and energy consumption control of equipment.
Second, the common servo valve fault causes
1. Pollution and blockage: There are a lot of dust and particles in the mine environment, which easily enter the servo valve through hydraulic oil, resulting in the blockage of the orifice or the seizure of the slide valve.
2. Oil deterioration: The hydraulic oil will be oxidized and emulsified after being used for a long time, resulting in viscosity change or impurities, which will affect the working performance of the servo valve.
3. Vibration shock: The vibration of mining machinery is strong during operation, which may easily lead to loose connection of servo valve, valve core wear or fatigue damage.
4. Too high temperature: high temperature environment or overheating of the system will make the internal seal of the servo valve aging and invalid, affecting its sealing performance.
Third, the specific measures to protect the servo valve
In order to ensure the long-term stable operation of the servo valve, the following measures should be taken in daily use and maintenance:
1. Strengthen the management of hydraulic oil
Change the hydraulic oil regularly and use a standard filter to keep the oil clean. It is recommended to adopt a multi-stage filtration system to ensure that the oil entering the servo valve reaches the standard of NAS 8 or higher.
2. Regular inspection and maintenance
According to the requirements of the manual, regularly check the installation status, connection and fastening and external cleanliness of the servo valve, and clean up the dust and dirt in time.
3. Optimize the working environment
Minimize the long-term operation of the equipment in extreme temperature, high humidity or high dust environment, and add dust cover or cooling device if necessary.
4. Use servo valve protection device
Auxiliary devices such as accumulator and shock absorber can be installed in the hydraulic system to reduce the impact of impact pressure on the servo valve and improve the stability of the system.
5. Training operators
Improve the operator’s understanding of the importance of servo valve, avoid misoperation, such as frequent start and emergency stop, and prevent hydraulic shock.
IV. Conclusion
With the development of mining machinery towards intelligence and high efficiency, the application of servo valve will be more extensive. Strengthening the protection of servo valve is not only the need of equipment maintenance, but also the key link to improve mine production efficiency and ensure operation safety. Only through scientific management, standardized operation and regular maintenance can the service life of servo valve be extended to the maximum extent and the continuous and stable operation of mining machinery be ensured.
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(The full text is about 980 words)