Hydraulic system maintenance

The quality of a hydraulic system not only depends on the rationality of the system design and the performance of the system components, but also because of the pollution protection and treatment of the system, the pollution of the system directly affects the reliability of the hydraulic system and the service life of the components, according to statistics, about 70% of the hydraulic system failures at home and abroad are caused by pollution.

The damage of folding oil contamination to the system is mainly as follows

1) Pollution wear of components

Various pollutants in the oil cause various forms of wear of the components, and solid particles enter the clearance of the moving pair, resulting in cutting wear or fatigue wear on the surface of the parts. The impact of solid particles on the surface of components in high speed liquid flow causes erosion wear. The water in the oil and the products of the oil oxidation and deterioration have a corrosive effect on the components. In addition, the air in the oil of the system causes cavitation, resulting in erosion and destruction of the component surface.

2) Component blockage and clamping failure

Solid particles block the gap and orifice of the hydraulic valve, causing the valve core to block and clamp, affecting the working performance, and even leading to serious accidents.

3) Accelerate the deterioration of oil performance

The heat energy of the water and air in the oil is the main condition for the oxidation of the oil, and the metal particles in the oil play an important catalytic role in the oxidation of the oil, in addition, the water and suspended bubbles in the oil significantly reduce the strength of the oil film between the moving pairs, so that the lubrication performance is reduced.

Folding a, the types of pollutants

Pollutants are substances that harm the system in the hydraulic system oil, which exist in different forms in the oil, and can be divided into solid pollutants, liquid pollutants, and gaseous pollutants according to their physical forms.

Solid pollutants can be divided into hard pollutants, including: diamond, cutting, silica sand, dust, wear metal and metal oxides; Soft pollutants include additives, water condensates, oil breakdown and polymers, and cotton silk and fibers brought in during maintenance.

Liquid pollutants are usually grooving oil, water, paint and chlorine and its halides that do not meet the requirements of the system, which are usually difficult for us to remove, so we should choose hydraulic oil that meets the system standards when choosing hydraulic oil to avoid some unnecessary failures.

Gaseous pollutants are mainly air mixed into the system.

These particles are often so small that they cannot settle down and are suspended in the oil, eventually being squeezed into the gaps in the various valves, whose limited control, importance, and accuracy are essential for a reliable hydraulic system.

Folding two, the source of pollutants

The sources of pollutants in the system oil mainly include the following aspects:

1) External intrusive pollutants: external intrusive pollutants are mainly grit or dust in the atmosphere, usually through the tank porosity, cylinder seal shaft, pump and motor shaft intrusion system. The main effect is the use of environment.

2) Internal pollutants: components in the processing, assembly, debugging, packaging, storage, transportation and installation of residual pollutants, of course, these processes are unavoidable, but can be reduced to a minimum, some special components in the assembly and debugging need to be carried out in the environment of clean room or clean table. 3) Pollutants produced by the hydraulic system: The particles produced by the wear of the components during the operation of the system, the sand particles falling off the castings, the metal particles falling off the pumps, valves and joints, the particles and colloids produced by the oxidation and decomposition of the oil in the pipeline, and the more serious is that the system pipeline has not been rinsed before the formal operation.