The function of the hydraulic system is to increase the 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 drive systems and hydraulic control systems. The primary function of a hydraulic drive 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), with the term "hydraulic system" generally referring to the hydraulic drive system.

Maintenance:

The quality of a hydraulic system depends not only on the rationality of the system design and the performance of system components, but also on the system's protection against and handling 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 transmission systems have gained increasingly widespread application across various fields due to their unique advantages, such as broad process adaptability, excellent control performance, and cost-effectiveness. However, the instability of raw and auxiliary component 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 lack the directness of mechanical equipment and the ease of measuring various parameters with electrical equipment using various testing instruments. In hydraulic systems, the indication of working parameters at certain system locations relies solely on a limited number of pressure gauges and flowmeters, making it difficult to measure other parameters. Moreover, the root causes of general malfunctions can be diverse, which complicates fault diagnosis in hydraulic systems.

On the production floor, due to constraints from production schedules and technical conditions, it is required that fault diagnosis personnel accurately and simply identify issues with hydraulic equipment; maintenance staff are to utilize available information and on-site technical conditions to minimize disassembly work, save on maintenance time and costs, and accurately locate and repair faulted components using straightforward technical methods within the shortest possible time. This should restore the system to normal operation and strive to prevent recurrence of similar faults in the future.

System Maintenance:

A system typically undergoes flushing before being officially put into use. The purpose of flushing is to remove contaminants, metal shavings, fiber compounds, and iron cores that may be left 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 the solvent 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 that all pipeline dimensions are appropriate and connections are correct.

If the electro-hydraulic servo valve is used in the system, let me elaborate a bit. The flushing plate of the servo valve must allow oil to flow from the supply line to the accumulator and then back into the oil tank, allowing for continuous recirculation to flush the system. This ensures the oil filter can remove solid particles. During the flushing process, check the oil filter every 1 to 2 hours to prevent blockage by contaminants. Do not open the bypass at this time. If you notice the oil filter starting to block, change it immediately.

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

Planned maintenance: Establish a regular maintenance system for the hydraulic system

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