The function of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts: power components, actuating components, control components, auxiliary components (accessories), and hydraulic oil. Hydraulic systems can be divided into two categories: hydraulic power transmission systems and hydraulic control systems. The hydraulic power transmission system primarily functions to transmit power and motion. The hydraulic control system is designed to ensure that the output of the hydraulic system meets specific performance requirements (especially dynamic performance). The term "hydraulic system" commonly refers to the hydraulic power transmission system.

Maintenance:

The quality of a hydraulic system depends not only on the rationality of the system design and the performance of its components, but also on the system's protection against and treatment of contamination. System contamination directly impacts the reliability of the hydraulic system's operation and the lifespan of its components. Statistics show that approximately 70% of hydraulic system failures worldwide are caused by contamination.

Fault Diagnosis:

Hydraulic transmission systems are gaining increasingly widespread applications across various fields due to their unique advantages, such as broad process adaptability, excellent control performance, and low cost. However, the instability of component quality objectively and improper use or maintenance subjectively, combined with the fact that all components and working fluids operate within a closed oil circuit, which is neither as直观 as mechanical equipment nor as easily measurable with various testing instruments as electrical equipment, presents certain difficulties in diagnosing hydraulic system failures. This is because, relying solely on a limited number of pressure gauges, flowmeters, and the like to indicate the operating parameters of certain parts of the system, other parameters are difficult to measure, and the root causes of general malfunctions can have many possibilities.

On the production site, due to constraints from production schedules and technical conditions, it is required that fault diagnosis personnel accurately and simply identify hydraulic equipment failures; maintenance personnel are to utilize existing information and on-site technical conditions to minimize disassembly work, save on repair time and costs, and use simple technical methods to accurately locate the faulty parts and the cause of the failure within the shortest possible time, and then repair them. This is to restore the system to normal operation and strive to prevent similar failures from occurring in the future.

System Maintenance:

A system typically undergoes flushing before being officially put into use. The purpose of flushing is to remove pollutants, metal shavings, fiber compounds, iron cores, and other debris from within the system. During the initial two hours of operation, even without completely damaging the system, it can cause a series of malfunctions. Therefore, follow these steps to clean the system's oil circuit:

1) Clean the oil tank with a quick-drying solvent, then remove any residue with filtered air.

2) Clean all piping in the system; in some cases, it may be necessary to soak the piping and joints.

3) Install oil filters in the pipeline to protect the valve's fuel and pressure lines.

4) Install a flush plate on the manifold instead of a precision valve, such as an electro-hydraulic servo valve.

5) Verify all pipeline dimensions are appropriate and connections are correct.

If the system uses electro-hydraulic servo valves, I'll elaborate a bit further. The flushing plate of the servo valve must allow oil to flow from the supply line to the collector and directly back to the oil tank. This allows for the continuous circulation of oil, thus cleaning the system and letting the oil filter remove solid particles. During the flushing process, check the oil filter every 1 to 2 hours to prevent it from being clogged by contaminants. Do not open the bypass, and if you notice the oil filter starting to clog, replace it immediately.

The cycle for flushing is determined by the system's construction and the degree of system contamination. If the sample of the filter medium lacks or has very few foreign contaminants, install a new oil filter, remove the flushing plate, and set the valve to work!

Scheduled Maintenance: Establish a regular maintenance system for the hydraulic system