The pollution of hydraulic oil means that the hydraulic oil contains impurities such as water, air, solid particles, chemical substances and microorganisms. In addition, oil deterioration caused by changes in oil temperature is also a pollution.
1. Soft particle pollution (paint film): oil products due to high-temperature oxidation, “micro-burning”, spark discharge (when oil passes through small gaps such as valve cores, precision filter elements, intermolecular internal friction generates static electricity, and sudden discharge after accumulation, causing micro-area (High temperature above 10000℃) produces fine “soft particles” that account for more than 80% of the total particles in hydraulic system or turbine oil, and these particles are polar.
2. Solid particle pollution: There are both metal solid particles and non-metal solid particles in hydraulic oil, which will cause great damage to the system, such as material wear, and small particles will cause the gap between the friction pairs to expand, resulting in system failure; Erosion wear is caused by the impact of high-speed water flow; there is fatigue wear, fatigue peeling of the attached metal surface, and the gear pump* is prominent; there is adhesion wear, which is caused by the heating of the metal and the metal surface with too thin oil film. Contaminants can block orifices or nozzles and cause system failure.
3. Original pollutants: refers to pollutants hidden in components and pipelines. Mainly are system components, the contaminants remaining in the process of processing, assembly, packaging, storage and transportation of the components, including metal cutting, oxide scale, welding slag, sand and dust.
4. Invasive pollutants: refers to pollutants invaded by the outside world. For example, there is no dust ring on the surface of the piston rod of a hydraulic cylinder, which causes the intrusion of external pollutants; also, if you do not pay attention to cleaning during maintenance, it will bring pollutants to the surrounding environment; dirty oil drums are not strictly cleaned when they are used, which brings pollution Things etc.
5. Internal pollutants: pollutants generated during work. During the assembly, operation and commissioning of the system, the components produce metal wear, pipeline corrosion and peeling, seal wear and debris, oil oxidation and deterioration produce sediments and colloids; water in the oil corrodes metals and forms rust.
6. Gas pollution of hydraulic oil: bubbles and bubbles in hydraulic oil are invisible pollutants. It can reduce the rigidity of the oil itself, reduce the volumetric efficiency, reduce the performance, and instantly compress the bubbles in the oil, accelerate the oxidation of the oil, reduce the lubricity of the oil, and accelerate the aging of the seal. According to reports, after the hydraulic oil reaches the upper limit of the allowable temperature, when it exceeds 10°C, the oxidation rate doubles, and it is easy to form insoluble sludge, clogging the holes and passages of the filter screen and the hydraulic valve; on the other hand, it will vaporize the oil and make the oil Poor flow prevents the heat from being taken away and distributed in time, which further aggravates the temperature rise of the oil, which becomes a vicious circle and eventually leads to failure. The prevention method is to change the hydraulic oil regularly, or take samples for inspection regularly, and replace it in time if it is found to exceed the standard.
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Post time: Nov-29-2021