The noise of the hydraulic pump is mainly caused by the following three reasons. Dalan Hydraulics will analyze it with you.
1. Suction is one of the main causes of excessive noise of hydraulic pumps.
When air is mixed into the oil, it is easy to form cavitation in its high pressure zone and propagate in the form of pressure waves, causing oil to oscillate, causing cavitation noise.
The main reasons are:
1 The oil filter of the hydraulic pump, the oil inlet pipe is blocked or the viscosity of the oil is too high, which can cause the vacuum at the pump inlet to be too high, so that the air penetrates.
2 The oil seal of the hydraulic pump and the pilot pump shaft is damaged, or the inlet pipe is poorly sealed, causing air to enter.
3 The oil level of the oil tank is too low, so that the hydraulic pump inlet pipe is directly sucked.
When there is high noise in the operation of the hydraulic pump, the above parts should be inspected first, and the problem should be dealt with in time.
2. The internal components of the hydraulic pump are excessively worn.
1 If the cylinder of the plunger pump and the fitting plate, the plunger and the plunger hole wear and tear, the leakage of the hydraulic pump will cause serious leakage. When the hydraulic pump outputs high pressure and small flow of oil, flow pulsation will occur. Causes higher noise.
At this time, the deflection angle of the pilot system variable mechanism can be appropriately increased to improve the influence of internal leakage on the pump output flow.
2The servo valve spool of the hydraulic pump and the piston that controls the flow will also cause the piston to pulsate during the movement due to local wear and strain, causing fluctuations in the output flow and pressure of the hydraulic pump, resulting in greater vibration at the pump outlet. noise.
At this point, the components that are severely worn or strained can be brushed and replaced or replaced.
3. The hydraulic pump distribution plate is also one of the important components that easily cause noise.
1 When the distribution plate is in use, due to surface wear or sludge deposition on the opening of the unloading groove, the unloading groove will be shortened and the unloading position will be changed, resulting in a trapped oil phenomenon, which in turn will cause higher noise.
2 In the normal repair process, the flat-repaired distribution plate will also have the effect of shortening the unloading groove. If it is not properly lengthened, it will generate more noise.
3 During the assembly process, the large unloading groove of the distribution plate must be installed in the high pressure chamber of the pump, and its sharp angle direction must be opposite to the direction of the cylinder, otherwise it will bring greater noise to the system.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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