When the hydraulic oil of four column hydraulic press is applied under high temperature and high pressure, it will gradually become brittle and moldy with the increase of time and place. The following situations occur.
① The oil situation has changed. This also refers to the embrittlement of finished oil, such as color tone, gas ambiguity and shape change of oil.
② The flash point of the opening is reduced, but note that this is also the case when different types of refined oil are mixed.
③ The acid value changes obviously.
④ Mechanical equipment residue lifting.
When hydraulic oil is applied under high temperature and high pressure, it will gradually become brittle and moldy with the increase of time and place. The following situations occur.
① The oil situation has changed. This also refers to the embrittlement of finished oil, such as color tone, gas ambiguity and shape change of oil.
② The flash point of the opening is reduced, but note that this is also the case when different types of refined oil are mixed.
③ The acid value changes obviously.
④ Mechanical equipment residue lifting.
⑤ Demulsification resistance and foam resistance decreased.
⑥ Reliability is affected.
The mildewed hydraulic oil of the four column hydraulic press cannot meet the requirements of the hydraulic transmission system and must be replaced. At this stage, it is clear that there are three ways to change the oil according to work experience, fixed cycle time and comprehensive exploration and analysis.
The first method is based on the working experience of the operator and on-site professional technicians, and according to the simple methods of "looking, smelling, touching and shaking", it is required to change the parking when the hydraulic oil turns black, black and turbid to a certain level.
The second method is to change the oil after more than half a year, one non operation or 1000 ~ 2000h operation according to different machinery and equipment and different product oil. The above two methods are widely used, but they are not scientific research and economic development.
The third method is to complete the inspection according to the oil samples taken on time, and measure the necessary new items, so as to facilitate the continuous monitoring of the liquid mildew condition. According to the specific situation of the transformation of the physical performance parameters of the hydraulic oil, it is clear when to change the oil. The method of hydraulic press is more scientific, but a set of physical and chemical testing instruments and equipment is required. This method is also called oil change oil method
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