WORLD power press machine manufacturer and supplier 

Tel: 86-15696788493   Email:  sales3@worldpowerpress.com

Noise Analysis of Hydraulic Press

by:WORLD     2022-11-30


Noise Analysis of Hydraulic Press




(1) The needle valve is excessively worn due to frequent opening during use, so that the cone surface of the needle valve and the valve seat cannot be tightly fitted, resulting in undisturbed pilot flow and pressure fluctuations that cause noise. At this moment, it should be repaired or replaced in time. Therefore, dead bends should be avoided as far as possible in the installation of pipelines, and the loose clips must be tightened in time. During the installation process, the large unloading groove of the valve plate must be installed in the high pressure chamber of the pump, and the direction of the sharp corner must be opposite to the rotation direction of the cylinder, otherwise it will bring more noise to the system.



(2) The oil seal of the cylinder head is too tight or the piston rod is twisted, and noise will also occur due to tension during the movement.



When the hydraulic pump of the hydraulic press has high noise during operation, the above-mentioned parts should be checked first, and the problem should be dealt with in time. In the normal repair process, the distribution plate repaired by flat grinding will also show the result that the unloading groove is shortened.



The piston that controls the flow of the hydraulic pump will also be worn and strained due to some parts, which will cause the piston to pulsate during the movement process, resulting in the fluctuation of the output flow and pressure of the hydraulic pump, resulting in greater oscillation and noise at the pump outlet. At this time, the deflection angle of the variable structure of the pilot system can be appropriately increased to improve the influence of internal leakage on the output flow of the pump.







1. Noise of hydraulic pump or motor



(1) The phenomenon of air suction is one of the main reasons for the high noise of the hydraulic pump.



2. The oil seal at the shaft end of the hydraulic pump and the pilot pump is damaged, or the oil inlet pipe is poorly sealed, causing air to enter o 3. The oil level of the oil tank is too low, so that the oil inlet pipe of the hydraulic pump is directly sucked empty.



3. Noise of hydraulic cylinder



(1) The oil is mixed with air or the air in the hydraulic oil cylinder is not completely exhausted, and a large noise occurs due to the phenomenon of cavitation under the high pressure effect. When the valve plate is in use, due to surface wear or sludge deposits on the open part of the unloading groove, the unloading groove will be shortened and the unloading position will be changed, which will cause oil trapping and cause higher noise.



The main reasons are:



(1) Air is mixed into the oil, which forms cavitation in the front cavity of the pilot valve and causes high-frequency noise.



The main reasons are:



The oil filter of the hydraulic pump, the oil inlet pipe obstruction or the oil viscosity is too high, which can cause the vacuum at the oil inlet of the pump to be too high, allowing air to penetrate. At this moment, the air must be exhausted in time.



2. Noise of hydraulic pressure relief valve



The overflow valve of the hydraulic press is prone to high-frequency noise, which is mainly caused by the undisturbed function of the pilot valve, which is the noise caused by the high-frequency oscillation of the pressure in the front chamber of the pilot valve caused by the air oscillation.



3. The pressure regulating function of the pilot valve is stable due to the fatigue deformation of the tension spring, which makes the pressure fluctuate greatly and causes noise. At this time, the tension spring should be replaced. At this moment, it is necessary to replace the oil seal or straighten the piston rod in time.







4. Pipeline noise



Vibration and noise can also occur due to excessive dead bends in the pipeline or loose fixed clips.



(1) Excessive wear and tear of the internal components of the hydraulic pump, such as wear and tear of the hydraulic pump cylinder block and distribution plate, rotor and vane fittings, which cause serious leakage in the hydraulic pump. When the hydraulic pump outputs high pressure and small flow of oil, it will Flow pulsation occurs, causing higher noise. At this point, the air should be exhausted in time and the outside air should be prevented from entering from the beginning.



(2) The hydraulic pump distribution plate is also one of the important components that is easy to cause noise. When air is mixed into the oil, it is easy to form cavitation in its high-pressure area, and it propagates in the form of pressure waves, resulting in oil oscillation, resulting in cavitation noise in the system. At this point, brush-plating, grinding, or alternative treatment can be performed on worn and severely damaged components. This article is from the official website of the manufacturer WORLD Press Machine www.pressmachine-world.com, please indicate the source for reprinting!



Shanghai Yingxin World Machinery Co., Ltd. promises that we will manufature our products in accordance with the strictest quality standards.
You can get a of any specification from Shanghai Yingxin World Machinery Co., Ltd. as we have varied specifications to suit different automatic power press machine needs and cater to a wide client base existing in both domestic and overseas market. please feel free to enquire us at World Press Machine.
have three basic components.
Custom message
Chat Online 编辑模式下无法使用
Leave Your Message inputting...