What factors determine the speed stability of a single-column hydraulic press

In the hydraulic system of the single-column hydraulic press, when the three-position and four-position reversing valves are in the neutral position, the oil circuit leading to the hydraulic cylinder is blocked, the two chambers of the hydraulic cylinder are interconnected, and return to the oil circuit, so that part of the oil is under the effect of potential energy. Back to the oil tank, when the reversing valve changes direction, one cavity of the hydraulic cylinder is connected to the pressure oil, and the other cavity is caused by the lack of back pressure, so that the movement of the hydraulic cylinder presents a forward rush, and the initial speed is unstable.

The single-column hydraulic press is in the double-rod hydraulic cylinder, because the leakage of the two chambers is not equal, and the frictional resistance of the reciprocating motion is different, which also makes the speed unstable.

The hydraulic system design of the single-column hydraulic press is not perfect, the selection of components does not match, the channel is blocked when the channel is saved, the leakage is serious inside and outside the system, excessive air enters the oil, and the frictional resistance changes, etc., which will also cause the speed of the actuator to be unstable at low speed. , even showing a creeping scene.

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