Based on concept of dynamic closed chamber, the calculation formula for oil compression power on hydraulic system of concrete pump is educed in this paper. The main factor that influences compression power has also been discussed. According to that, the oil compression power for high pressure and large flow hydraulic system has been calculated. Then, the flexible reversing control technology for pumping is put forward to eliminate the influence induced by compression power. The conclusion of the paper could be guidance for design of the hydraulic system of concrete pump to some extent.
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