Solution to noise generated by hydraulic system

The main reasons and solutions for noise generation in hydraulic systems are as follows:

1. The poor quality of hydraulic pumps or motors is usually the main part that generates noise in hydraulic transmission. The main causes of noise are poor manufacturing quality of hydraulic pumps, inaccurate accuracy that does not meet technical requirements, large fluctuations in pressure and flow rate, failure to effectively eliminate trapped oil, poor sealing, and poor bearing quality. In use, due to wear and tear of hydraulic pump components, excessive clearance, insufficient flow rate, and pressure fluctuations, it can also cause noise.
2. Air intrusion into the hydraulic system is the main cause of noise generation. When the hydraulic system invades the air, its volume is relatively large in the low-pressure area. When it flows to the high-pressure area, it is compressed and the volume suddenly decreases. However, when it flows into the low-pressure area, the volume suddenly increases. This sudden change in bubble volume produces an “explosion” phenomenon, which is commonly referred to as “cavitation”. For this reason, exhaust devices are often installed on hydraulic cylinders to facilitate gas discharge bladder accumulator definition.
3. Hydraulic system vibration, such as thin and long oil pipes, multiple bends without fixing, can easily cause pipe shaking during oil flow, especially when the flow rate is high; The rotating parts of the electric motor and hydraulic pump are unbalanced, or are not properly installed during installation, or the connecting screws are loose, which can cause vibration and noise. The measures to be taken for this include: the longer oil pipes should be separated from each other and separated from the machine tool wall, and appropriate support pipe clamps should be added; Adjust the installation accuracy of the motor and hydraulic pump; Reinstall the coupling, etc
4. Improper adjustment of the directional valve causes the valve core of the directional valve to move too quickly, resulting in directional imhttps://zp-accumulator.com/productspact and generating noise and vibration in the hydraulic system. In this case, if the directional valve is a hydraulic directional valve, the throttle element in the control oil circuit should be adjusted to ensure smooth and shock free directional control. When working, the valve core of the hydraulic valve is supported on the spring. When its frequency is bladder type accumulator diagram similar to the pulsating frequency of the hydraulic pump oil delivery rate or other vibration source frequencies, it will cause vibration and generate noise. At this point, by changing the natural frequency of the pipeline system, adjusting the position of the control valve, or adding an accumulator appropriately, vibration and noise reduction can be achieved.
5. The overflow valve is unstable, such as due to improper matching between the slide valve and the valve hole, or the contact between the cone valve and the valve seat being stuck by dirt, the damping hole being blocked, the spring being skewed or ineffective, causing the valve core to get stuck or move poorly in the valve hole, resulting in pressure fluctuations and noise in the hydraulic system. In this regard, attention should be paid to cleaning and unblocking the genital pores; Inspect the relief valve and if any damage is found or if the wear exceeds the specified limit, it should be repaired or replaced in a timely manner bladder type accumulator design .