Introduction of impurity sources and hazards of hydraulic filter

It is very important for the hydraulic system to maintain the cleanliness of oil and prevent oil pollution.

1. Mechanical impurities remaining in the hydraulic system after cleaning, such as rust, casting sand, welding slag, iron filings, paint, paint skin and cotton yarn filings, and impurities entering the hydraulic system externally, such as dust entering through the oil filler and dust ring;
2. Impurities produced in the working process, such as the fragments formed by the hydraulic action of the seal, the metal powder produced by the relative wear of the movement, the colloid, asphaltene, carbon slag produced by the oxidative deterioration of the oil, etc.

After the above impurities are mixed into the hydraulic oil, with the circulation of the hydraulic oil, they will play a destructive role everywhere, which will seriously affect the normal operation of the hydraulic system and make a small gap between the relatively moving parts in the hydraulic components (calculated by μ m) And the throttle hole and gap are stuck or blocked; Destroy the oil film between the relatively moving parts, scratch the gap surface, increase internal leakage, reduce efficiency, increase heating, intensify the chemical action of the oil, and deteriorate the oil. According to production statistics, more than 75% of the faults in the hydraulic system are caused by impurities mixed in the hydraulic oil. Therefore, it is very important to maintain the cleanliness of the oil and prevent oil pollution.