The function of the hydraulic system is to increase the applied force by altering 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 power transmission systems and hydraulic control systems. The hydraulic power transmission system primarily functions to transmit power and motion. The hydraulic control system aims to ensure that the output of the hydraulic system meets specific performance requirements (especially dynamic performance). When we refer to the hydraulic system, it is generally the hydraulic power transmission system that is meant.

Maintenance:

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

Fault Diagnosis:

Hydraulic drive systems have gained increasingly widespread application across various fields due to their unique advantages, such as broad process adaptability, excellent control performance, and low cost. However, due to the unstable quality of components and accessories, improper use and maintenance, and the fact that all components and working fluids operate within a closed oil circuit, unlike mechanical equipment which is more直观 or electrical equipment that can be easily measured with various testing instruments, hydraulic systems rely solely on a limited number of pressure gauges, flowmeters, etc., 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 be of many kinds, which presents certain difficulties in diagnosing hydraulic system failures.

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 malfunctions; that maintenance staff utilize existing information and on-site technical conditions to minimize disassembly work, save on repair time and costs, and use straightforward technical methods to accurately locate the fault and its cause within the shortest possible time. They should then carry out repairs to restore the system to normal operation and strive to prevent similar faults 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 contaminants 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, the following steps should be followed 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 is 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 appropriate and connections are correct.

If the system utilizes electro-hydraulic servo valves, let me elaborate a bit further. The flushing plate of the servo valve must allow the oil to flow from the supply line to the collector and directly back into the oil tank. This allows for continuous circulation of the oil, thus flushing the system. It enables the oil filter to remove solid particles. During the flushing process, it is necessary to check the oil filter every 1 to 2 hours to prevent clogging by contaminants. Do not open the bypass at this time. If you notice the oil filter beginning to clog, replace it immediately.

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

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