The function of the hydraulic system is to increase the force by changing pressure. A complete hydraulic system consists of five components: power elements, actuating elements, control elements, auxiliary elements (accessories), and hydraulic oil. Hydraulic systems can be divided into two categories: hydraulic transmission systems and hydraulic control systems. The main function of a hydraulic transmission system is to transmit power and motion. A 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 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 wider application across various fields due to their unique advantages, such as broad process adaptability, excellent control performance, and low cost. However, the instability of raw and auxiliary parts quality, as well as improper use and maintenance, pose challenges. Since the system's components and working fluids operate within a closed oil circuit, they are not as直观 as mechanical equipment nor as easily measured with various testing instruments like electrical equipment. In hydraulic systems, only a limited number of pressure gauges and flowmeters can indicate the working parameters of certain parts of the system, making it difficult to measure other parameters. Moreover, the root causes of general malfunctions can be diverse, which adds to the difficulty of diagnosing hydraulic system issues.

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 maintenance time and costs, and use simple technical methods to accurately locate the fault and its cause within the shortest possible time, and repair it. This should restore the system to normal operation and strive to prevent the recurrence of similar faults in the future.

System Maintenance:

A system typically undergoes flushing before its formal deployment. The purpose of flushing is to remove pollutants, metal shavings, fiber compounds, cores, and other debris from within the system. During the initial two-hour operation, even if the system isn't completely damaged, it can cause a series of malfunctions. Therefore, follow these steps to clean the system's oil pathways:

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 flushing plate on the manifold instead of a precision valve, such as an electro-hydraulic servo valve.

5) Verify all pipeline dimensions are correct and connections are properly made.

If the electro-hydraulic servo valve is used in the system, I might as well add a few words about it. The flush plate of the servo valve must allow oil to flow from the supply line to the collector and then back to the oil tank, enabling the oil to circulate repeatedly to flush the system. This helps the oil filter remove solid particles. During the flush, check the oil filter every 1 to 2 hours to prevent clogging from contaminants. Do not open the bypass. If the oil filter begins to clog, replace it immediately.

The flushing cycle is determined by the system's design and the degree of system contamination. If the filter medium sample has little to no external contaminants, install a new oil filter, remove the flushing plate, and install the valve to operate!

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