Single column hydraulic press working medium

The function of the working medium used in the single-column hydraulic press is not only to transmit pressure, but also to ensure that the working parts of the machine are sensitive, reliable, long-lived and less leaking. The basic requirements for the working medium of a single-column hydraulic press are:

①Have suitable fluidity and low compressibility to improve the efficiency of transmission;

② can prevent rust;

③ have good lubricating performance;

④Easy to seal;

⑤Stable performance, long-term work without deterioration.

The hydraulic press initially used water as the working medium, and later switched to an emulsion made by adding a small amount of emulsified oil to the water to increase lubricity and reduce rust. In the late 19th century, hydraulic presses using mineral oil as the working medium appeared. Oil has good lubricity, anti-corrosion and moderate viscosity, which is beneficial to improve the performance of single-column hydraulic press. In the second half of the 20th century, a new type of water-based emulsion appeared, and its emulsification form was 'water-in-oil' instead of the original 'oil-in-water'. The external phase of 'water-in-oil' emulsion is oil, its lubricity and anti-corrosion properties are close to oil, and its oil content is very small, and it is not easy to burn. However, the water-based emulsion is expensive, which limits its promotion.

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