1. The pre-management pre-management mainly refers to the management work before the hydraulic system is officially put into use, including the production, installation, commissioning and transportation of the hydraulic system. In these processes, chips, burrs, sand, paint, welding slag, rust, dust, etc., may all “hiddle†in the hydraulic system. If they are not taken care of, they will inevitably cause pollution in the future hydraulic system. Therefore, in order to prevent the early pollution of the hydraulic system, the following protective measures must be taken:
(1) Strictly inspect the degree of contamination of purchased parts and processed parts. All oil ports must be covered and sealed during the transportation and storage of hydraulic valves, pumps and filters, and high-pressure hoses to prevent intrusion of contaminants.
(2) Before installation of the hydraulic system, all hydraulic components and parts must be thoroughly cleaned, especially the impurities of thin tubes, blind holes, and blind corners should be cleaned, and the cleaned parts should be dried with a clean gas to prevent the cleaning fluid. Mix in the hydraulic oil of the hydraulic system. Pre-installation cleaning includes mechanical cleaning and chemical cleaning (if cleaning in trichloroethylene, then drying with compressed air; if pickling is used, neutralization should be performed and rinsed, and the tube should be sealed in a clean plastic bag until Dry can be installed). The components are washed with kerosene before assembly, but scrubbing with fabrics with fibers is prohibited.
(3) The hydraulic oil should be stored in a clean place in a sealed place to prevent high temperature contact and open storage.
(4) The hydraulic oil tank should be sealed reasonably and the air filter should be installed in the atmosphere. The seal must be reliable. It is forbidden to use oil-resistant seals and hoses.
2. Late-stage management (1) During the maintenance of the hydraulic system, it is necessary to prevent the contamination of the outside of the system and the impurities such as cotton thread into the system.
(2) All assembly, test equipment, oil fillers, strainers, etc. must be kept clean to prevent dirt from being carried into the hydraulic system.
(3) In the course of use, components such as hydraulic pumps and hydraulic valves will generate metal particles due to wear. The wear or destruction of rubber seals will produce rubber particles. The oxidation of hydraulic oil will form colloidal precipitates. Therefore, the hydraulic oil in use should be regularly filtered with a special filter.
(4) It is not possible to mix several types of hydraulic oils with different properties, and it is impossible to mix new hydraulic oils into hydraulic oils that are about to deteriorate or have been degraded.
(5) Before the oil change in the hydraulic system, the residual oil in the entire system should be removed.
(6) Change the hydraulic oil regularly. The used hydraulic oil should be cleaned. Clean the filter on time. The filter and copper pads must not be damaged during cleaning.
Second, the determination of hydraulic oil pollution
1. Determination of solid particle contaminants. The particle size, shape and surface characteristics of the hydraulic oil contaminants can roughly reflect the type and source of contaminants. Spectral analysis, X-ray line spectrometry, X-ray spectroscopy, and ferrography analysis can be used to identify the contaminant components. And content. It can also be measured using the gravimetric method, particle counting method or deposition index method.
2, the determination of water content. The water content of hydraulic oil is usually expressed in percentage or parts per million (ppm). Since the boiling point and conductivity constant of water and oil are not the same, the distillation method and the electricity method can be used for the determination. Higher, up to 1ppm.
3, the determination of air content. After the hydraulic oil is mixed with different amounts of air, the turbidity and bulk modulus of the oil are not the same. Therefore, we can use the oil erodometer method and the oil compression method to determine the air content.
Through the above determination and oil sampling tests (such as measuring the oil viscosity, acid value, flash point, ignition point, density and corrosion indicators) analysis to determine whether the hydraulic system should change the oil, in order to ensure the normal operation of the hydraulic system.
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