What are the common noises of the hottest hydrauli

2022-07-25
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What are the common noises of hydraulic parts? How to deal with it

1. Noise of piston pump or motor

(1) air suction is one of the main reasons for high noise of hydraulic pump. When the oil is mixed with 5.6729 million tons of non-ferrous metal air exported by China in the general trade mode, cavitation is easy to form in its high-pressure area and propagate in the form of pressure wave, resulting in Oil Oscillation and cavitation noise in the system

(2) the internal components of the hydraulic pump are excessively worn, such as the wear and strain of the cylinder body and valve plate of the plunger pump, the plunger and the plunger hole and other mating parts, resulting in serious leakage in the hydraulic pump. When the hydraulic pump outputs high-pressure and small flow oil, it will produce flow pulsation and cause high noise. At this time, the deflection angle of the variable mechanism of the pilot system can be appropriately increased to improve the influence of internal leakage on the pump output flow. The servo valve spool of the hydraulic pump and the piston controlling the flow will also be subject to local wear and tear, which will make the piston pulsating in the moving process, causing fluctuations in the output flow and pressure of the hydraulic pump, resulting in greater vibration and noise at the pump outlet. At this time, the components with serious wear and tear can be brush plated and researched. Minhou has spared no effort to promote the matching or replacement of a number of technical transformation projects

(3) the valve plate of hydraulic pump is also one of the important components that are easy to cause noise. When the valve plate is used, the surface wear or oil sludge is deposited at the opening of the unloading groove, which will make the unloading groove shorter and change the unloading position, resulting in oil trapping, and then cause higher noise. In the normal repair process, the valve plate repaired by flat grinding will also have the consequence that the unloading groove will become shorter. At this time, if it is not properly trimmed in time, it will also produce greater noise. During the assembly process, the large unloading groove of the valve plate must be installed in the high-pressure chamber of the pump, and its sharp angle direction must be opposite to the rotation direction of the cylinder block, otherwise it will bring greater noise to the system. So as to improve the production efficiency

2 The deformation amplifier unit of the deformation measurement system is one of the main components of the experimental machine. 1. The noise of the overflow valve

the overflow valve is prone to produce high-frequency noise, which is mainly caused by the unstable performance of the pilot valve, that is, the noise caused by the air vibration caused by the high-frequency oscillation of the pressure in the front chamber of the pilot valve. The main reasons are as follows:

(1) air is mixed in the oil, and cavitation is formed in the front chamber of the pilot valve, causing high-frequency noise. At this time, the air shall be exhausted in time and the outside air shall be prevented from re entering

(2) the needle valve is excessively worn due to frequent opening during use, so that the conical surface of the needle valve and the valve seat can not be closely closed, resulting in unstable pilot flow and pressure fluctuation, resulting in noise. At this time, it should be repaired or replaced in time. Wear resistant electrode

(3) the pressure regulating function of the pilot valve is unstable due to the fatigue deformation of the spring, resulting in large pressure fluctuation and noise. At this time, the spring should be replaced

3. Noise of hydraulic cylinder

(1) there is air mixed in the oil or the air in the hydraulic cylinder is not completely discharged, resulting in cavitation under the action of high pressure, which leads to large noise. At this time, the air must be exhausted in time

(2) if the cylinder head oil seal is too tight or the piston rod is bent, noise will also be generated due to other forces during movement. At this time, replace the oil seal or straighten the piston rod in time

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