Four-column hydraulic press hydraulic cylinder load efficiency

Four-column hydraulic press hydraulic cylinder load efficiency

The total efficiency of the hydraulic cylinder of the four-column hydraulic press should include mechanical efficiency and volumetric efficiency. However, it is difficult to measure the weaving efficiency, so the efficiency test of the hydraulic cylinder only considers the mechanical efficiency, that is, its load efficiency is measured. The load efficiency can be expressed by the following formula:

When carrying out the load efficiency test of the four-column hydraulic press, first install the dynamometer on the piston rod, gradually increase the hydraulic pressure p, and at the same time the output force also increases, and then calculate the pressure value p and the corresponding hydraulic cylinder output force w Record it and draw it into a graph (solid 4-1) 0 According to the requirements, the load efficiency of the hydraulic cylinder should be above 90%.

The efficiency of the hydraulic cylinder of the four-column hydraulic press is different at each stage of the movement process. When starting, the hydraulic cylinder has to overcome the static friction of the sealing device, so the efficiency is low. When moving at high speed, the sealing friction force is small, so the efficiency is high. However, since the start-up time of the hydraulic cylinder is very short, it can generally be ignored.

In addition, the hydraulic cylinder of the four-column hydraulic press is less efficient when the hydraulic pressure is low, and the efficiency is the lowest when working at the lowest starting pressure, because a lot of the piston thrust generated at this time needs to be used to overcome the friction of the seal.

In the load efficiency test, the hydraulic pressure should be measured at the oil inlet of the hydraulic cylinder, and the back pressure of the hydraulic cylinder oil should be zero, otherwise the test results cannot accurately reflect the real load efficiency. This article is from the official website of the manufacturer WORLD Press Machine www.pressmachine-world.com, please indicate the source for reprinting!

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