The main cause of noise in the hydraulic system of the excavator

- Nov 13, 2018-

When the hydraulic system is mixed with air, it will definitely affect the pressure of the system. There will be bubbles in the oil, the action of the actuator will be unstable, and the pipeline and equipment will vibrate.


Then there is air corrosion and dry friction on the hydraulic components, which affects the service life of the components.


The main reasons for the noise generated by the hydraulic system and the solutions are as follows:


1. The quality of the hydraulic pump or motor is not good, and it is usually the main part of the noise generated in the hydraulic transmission. The quality of the hydraulic pump is not good, and the accuracy does not meet the technical requirements.


The pressure and flow fluctuations are large, the trapped oil phenomenon is not well eliminated, the seal is not good, and the bearing quality is poor, which are the main causes of noise. in use,


Due to the wear of the hydraulic pump parts, the gap is too large, the flow is insufficient, and the pressure is fluctuating, which also causes noise.


2. Air intrusion into the hydraulic system is the main cause of noise. Because the hydraulic system invades the air, it is bulky in the low pressure zone and is subject to flow to the high pressure zone.


Compression, the volume suddenly shrinks, and when it flows into the low-pressure zone, the volume suddenly increases, and the sudden change of the bubble volume causes an "explosion" phenomenon.


Noise is generated, which is often referred to as "holes." For this reason, an exhaust device is often provided on the hydraulic cylinder for the gas to be discharged.


3, the hydraulic system vibration, such as the slender oil pipe, the elbow is more and not fixed, in the oil circulation process, especially when the flow rate is high, it is easy to cause the pipe to shake;


The rotating parts of the motor and the hydraulic pump are unbalanced, or they are not properly installed during installation, or the connecting wires are loose, etc., which can generate vibration and noise. In this regard


The measures to be taken are: long oil pipes should be separated from each other and separated from the machine tool wall, and appropriate support pipe clamps should be added; the installation accuracy of the motor and hydraulic pump should be adjusted;


Reinstall couplings, etc.


4. The misalignment valve is improperly adjusted, so that the spool of the reversing valve moves too fast, causing a reversing impact, thus generating noise and vibration of the hydraulic system. In this case, if


If the reversing valve is a hydraulic reversing valve, the throttling element in the control oil circuit should be adjusted to make the commutation smooth and shock-free. At work, the spool of the hydraulic valve supports the bomb


On the sprung, when the frequency is close to the pulsation frequency of the hydraulic pump oil delivery rate or the frequency of other vibration sources, it will cause vibration and generate noise. At this time, by changing


The natural frequency of the piping system, the position of the control valve or the proper storage of the accumulator can prevent vibration and noise.


5. The relief valve is unstable, such as due to improper matching of the spool valve and the valve hole or the dirt at the contact between the cone valve and the valve seat, the damping hole is blocked, the spring is skewed or invalid.


The spool is stuck or does not move within the valve bore, causing pressure fluctuations and noise in the hydraulic system. In this regard, attention should be paid to cleaning and dredging the negative hole;


Inspection, if found to be damaged, or due to wear and tear exceeds the regulations, it should be repaired or replaced in time.