The understanding of several harmful in hydraulic baling press hydraulic phenomenon
In our daily work to choose a system is stable and highefficiency of hydraulic machinery, hydraulic baling press, it is very importantfor us. Because the words are referred to as the "to do a good job, will be agood first". So to ensure our efficient hydraulic machinery operation, there areseveral hydraulic harmful phenomenon, for our staff is very important tous.
A: we want to understand the phenomenon that the hydraulic impact ofhydraulic shock this harmful phenomenon is caused by mutations that cause thehydraulic oil hydraulic components work instantaneous has risen sharply, producethe high hydraulic pressure peak, a shock wave passing, this phenomenon iscalled hydraulic impact or call it "wataer hammer"
In daily work to ensurethat the mechanical properties of the good we have a better way to reduce thehydraulic impact is good method to provide good service to our customers.
1.To extend the time of the closing of the valve, reducing the speed of thereversing valve core.
2. Appropriate increase pipe diameter in order toreduce the flow velocity (pressure line is commonly 3-5 m/s).
3. Set limitpressure relief valve.
4. Set the hydraulic buffer device, reduce the speedof the large inertia in the moving parts of the runtime changes.
5. The useof accumulator and rubber hose to absorb hydraulic impact energy.
2:cavitation
According to Bernoulli equation can know through the valve for thehydraulic medium mouth contraction cross section, the pressure to reduce, thepressure drops and bubbles generated in the hydraulic oil.
For example, whenpressure is reduced to the medium of saturated steam pressure, will producecavitation phenomenon, thus forming a large number of steam bubble.
Whenpressure reduce to medium air separation will have a lot of air is sucked outfrom the liquid to form a large number of air bubbles.
3. The cavitationphenomenon:
Bubbles with high flow was brought to the downstream, the bubblevolume shrinking dramatically or breaking, bubbles of air or steam or condensedliquid back into the liquid. At the instant of the bubble breaking, the bubblesbreaking out of the local high temperature and high pressure, resulting in ahydraulic impact and with noise and vibration. The hydraulic oil oxidation.Bubbles breaking such as occurred in hydraulic components of the solid surfaceis generated when the bubble breaking the jet erosion, high temperature,chemical corrosion effect of joint action. Eventually lead to hydrauliccomponents surface spalling and bad corrosion phenomena.
May occur in thehydraulic system of air-pocket and the parts of the corrosion phenomena aremainly:
Pump oil suction mouth, overflow valve valve mouth, with largeinertia load of actuators, etc.
So how do we reduce and prevent cavitationand erosion phenomenon?
1. The right design line, limit pump oil suctionmouth from the fuel tank of liquid level height (shortened as much as possibleand improve the suction characteristic).
2. Improve the pipeline sealing toprevent air infiltration.
3. Select cavitation resistant material, improvethe quality of components of surface (overflow valve, throttle valve,etc.)