There is a phenomenon that you may already be familiar with: hydraulic systems working in loud noise. In industrial settings, machines inevitably produce noise when working, this is a common problem, but also can not be completely avoided at present, but we should pay attention to is that long-term work in a noisy environment will be detrimental to human hearing, and may even cause headaches, is not conducive to good health, so the study of the hydraulic system of the noise reduction measures, to maintain employees' physical and mental health, to protect the system's long-term stable work, to improve the system performance and other aspects of far-reaching significance. System performance and other aspects of far-reaching significance.
1.the reasons for noise in the hydraulic system
（1）Air intrusion into the hydraulic system. Air intrusion into the hydraulic system is the main reason for the noise generated by the hydraulic system. Hydraulic system intrusion of air, in the low-pressure area of its larger volume, when the flow to the high-pressure area by the compression, the volume suddenly shrinks, and when it flows into the low-pressure area, the volume of the sudden increase in the volume of this bubble volume of the sudden change, resulting in an “explosion” phenomenon, resulting in noise, this phenomenon is usually referred to as the “air pockets This phenomenon is usually called “air pockets”. This phenomenon is not only accompanied by a sharp whistling sound, causing harm to people, but also accompanied by large fluctuations in pressure, serious equipment can not work properly.
(2) Poor quality of hydraulic pump or motor. Hydraulic pump or motor quality is not good will also produce a lot of noise. Hydraulic pump manufacturing quality is not good, the precision does not meet the technical requirements, pressure and flow fluctuations, trapped oil phenomenon can not be eliminated, sealing is not good, as well as poor quality bearings and so on are the main causes of noise.
(3) Mechanical vibration. Mechanical systems, noise and vibration go hand in hand. Hydraulic system at work, hydraulic pumps, hydraulic valves, pipelines, etc. will be followed by vibration, which is inevitable. When the hydraulic system is not properly maintained and repaired, resulting in bending and deformation of the rotor shaft, pipeline loosening, the vibration sound will be abnormally large, so the daily need to do a good job of checking the work.
2. Methods to reduce noise
For the above reasons, the following methods can be used to reduce the noise generated by the hydraulic system.
(1) Ensure that the system is sealed. Due to the joint bolt preload is too small or sealing washer failure, the outside air into the system, exacerbating the phenomenon of air pockets. Therefore, it is necessary to frequently check the sealing situation, found that the seal failure, should be replaced in a timely manner.
(2) Check and determine the source of the noise, when the noise of the hydraulic system is too loud, we should first check if there is a problem with the hydraulic system, and then targeted solutions. For example, when loose piping causes excessive vibration sound, the piping path can be optimized and the installed piping can be as short as possible. When the long distance must be set, increase the number of pipeline support pieces or segmented settings, thereby reducing the amplitude of pipeline vibration at work; when the hydraulic pump parts are damaged resulting in excessive noise, the damaged parts should be replaced in a timely manner. It is also possible to use thin metal in the hydraulic system over a large area to effectively reduce the radiated noise, which can be reduced by strategically placing engineering reinforcement ribs or damping the metal surface.
(3) By adding “hydraulic silencers” to the hydraulic system, pressure fluctuations can be reduced, thus reducing noise in the hydraulic system.
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