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| The several hydraulic parts common noise fault | | admin：admin issue：2012/11/20 8:22:17 cake：4101 | This paper WLYl00 hydraulic excavator hydraulic system, for example, the possible noise reasons, exclude the method described below.
1. Piston pump or motor noise
(1) The cavitation phenomenon is one of the main reasons causing the excessive noise of the hydraulic pump. When the fluid mixed with air, easy cavitation is formed at its high pressure zone and the form of the pressure wave propagation, resulting in the fluid oscillation, causes the system to produce cavitation noise. The main reason:
1 hydraulic pump oil filter inlet pipe is clogged or the oil viscosity is too high, can cause the pump inlet vacuum is too high, the air infiltration.
② hydraulic pump, pilot shaft end seal damage, or inlet pipe to seal bad, causing air to enter o
② oil tank level is too low, the hydraulic pump suction air inlet pipe directly.
Higher noise when the hydraulic pump work should be checked first of these parts, identify problems and timely treatment.
(2) the internal pump components excessive wear, such as piston pump cylinder block and valve plate, piston and plunger hole fitting wear and tear, injury, serious leak in the hydraulic pump, when the high pressure of the hydraulic pump output flow oil will flow pulsation, and lead to higher noise. May be appropriate to increase the agency's declination of the pilot system variables to improve the internal leakage of the pump output flow. Hydraulic pumps of the servo valve spool, the flow control piston, also because of partial wear, strain, so that the pulsation of the piston during the movement, causing the hydraulic pump output flow and pressure fluctuations, thus generating large vibration and noise at the pump outlet . At this time of serious wear and tear, strain components the brush plating spotting or replacement processing.
(3) hydraulic pump valve plate could lead to one of the important components of the noise. The valve plate in use due to open at the surface wear or sludge deposition in unloading tank will make unloading slot shorter and change the position of the unloading produce trapped oil phenomenon, sparking a high noise. Normal repair process by flat grinding repair the valve plate will appear shorter unloading tank consequences, if not timely to appropriate slender, will also have a larger noise. In the assembly process, the valve plate unloading tank must be installed in the high pressure chamber of the pump, and which the cusp direction of rotation of the cylinder shall be relative, otherwise the system will bring a large noise.
2. Relief valve noise
The relief valve is easy to produce high-frequency noise is mainly due to the performance of the pilot valve is unstable, namely, the front chamber of the pilot valve pressure high frequency oscillation caused by the noise of the air vibration generated. The main reason:
(1) oil mixed with air, before the pilot valve cavity to form the cavitation phenomenon caused by the high-frequency noise. At this point, should be promptly drained of air and prevent outside air to re-enter.
(2) the needle valve open during use due to frequent and excessive wear and tear, the needle valve cone and valve seat can not seal, instability caused by pilot flow generated pressure fluctuations caused by noise, you should promptly repaired or replaced.
(3) The pilot valve spring fatigue deformation caused by its regulator function instability, the pressure fluctuations caused by noise, you should replace the spring.
3. The noise of the hydraulic cylinder
(1) the oil mixed with air or hydraulic cylinder air is not completely drained, cavitation under high pressure and lead to greater noise. At this point, we must promptly drained the air.
(2) oil seal is too tight or the piston rod of the cylinder head bending, and also because of other fresh produce noise in the course of the campaign. At this point, to be timely to replace seals or straightening piston rod.
4. Piping noise
Pipe the dead bend too much or fixed clamp loose produce vibration and noise. Therefore, piping layout should avoid bending die the loose clamps must be tightened in a timely manner. | Previous：Steel pipe in the new energy automotive industry cited concern about the future
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