Hazards of pollution sources in hydraulic system
Hydraulic system pollution will have greater harm and impact on machinery and equipment, then the hydraulic system in the production of these hazards, we should be how to deal with it?
Hazards caused by contamination of Hydraulic System 2.1 sudden failure. When a large particle contaminant is brought into a pump or valve, such as a particle stuck in the rotor slot, the result may be the pump or motor is completely stuck; in a slide valve, into a large particle of pollutants can prevent spool movement.
Intermittent failure. If the valve entering the valve can prevent the valve correctly homing. If the valve seat is very hard and the particles can not be embedded in the valve seat, the particles may be washed away when the valve is opened again. After that, another particle may enter the seat valve again and stop completely closed, and then be washed away. So the seat valve intermittent failure occurs.
Degenerative failure. Results from particle wear, corrosion, cavitation, gas mixing, erosion wear or surface fatigue. Particle wear and surface fatigue account for about 90%., which increases leakage in the system components, reduces efficiency and accuracy, but these changes are difficult to detect at the beginning, and the final results, especially for pumps, may be sudden failure.
The particles in the gap are most likely to cause wear because of the interaction with the two surfaces. Due to the existence of excessive pollution, it will directly act with oil to make it deteriorate. It is worth noting that air, water and impurities have a strong catalytic effect on the deterioration of hydraulic oil.
The analysis of hydraulic system pollution control shows that the pollution of hydraulic system is very serious. Therefore, we should try to reduce the pollution of the system, of course, it is best to completely eliminate pollution, in order to mitigate or eliminate hazards. However, due to the cause of pollution is that related to the design, production, storage, use, maintenance and many other aspects and departments; moreover, the hydraulic equipment used in the process to produce the total pollution, therefore, not only difficult to completely eliminate the pollution, but also from the economic point of view, also is paltrily. Therefore, the pollution can only be controlled according to the specific requirements of the hydraulic system accuracy, within the allowable range.
Filter。 With the development of modern hydraulic technology, higher requirements for the cleanliness of the system oil are put forward. At present, the high precision filter with filter accuracy of 3 ~5m has been widely used in industrial hydraulic system, and the oil pollution is effectively controlled. In recent years, 1um (=200) high precision filters have been developed and used in highly polluting systems, such as aviation, aerospace, and aerospace.
The filtering precision and average filtering ratio by classification precision according to the value of groups tips, not only solved the problem of unified evaluation groups tips value as the standard, and reflects the filter performance differences, so that the user can choose according to different needs.
Set the target cleanliness level goals of cleanliness, is based on the investigation and analysis of the hydraulic system test widely pollution status and usage, for the United States Vickers according to the research results of hydraulic components cleanness grade suggestions, to set up the system target for cleaning degree. The specific method is: first according to the type of hydraulic components in the system in the search target cleanliness, selection of hydraulic components that require the highest degree of clean oil cleanliness as the goal of clean degree, and then according to the nature of work and work environment factors such as amended.
To achieve the cleanliness of the target, in the hydraulic system or lubrication system, by reasonable arrangement and selection of filters, the system oil can meet the requirements of target cleanliness.
Filtration system. The ability and effectiveness of pollution control in hydraulic systems depend not only on the accuracy of the filter, but also on the overall design of the filter system (location, type and number of filters) and the degree of control of contamination invasion. At present, the more perfect filtration system includes oil absorption Road, pressure oil circuit and return circuit filter, and some of them also use external circulation filter as auxiliary and supplement. For the medium contamination rate, the selection of filter accuracy and the expected cleanliness of the filter can be listed in the table.
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