工程机械液压缸气蚀故障的预防（Prevention of cavitation erosion in hydraulic cylinder of construction machinery）.docVIP

工程机械液压缸气蚀故障的预防（Prevention of cavitation erosion in hydraulic cylinder of construction machinery） Prevention of cavitation erosion in hydraulic cylinder of construction machinery 6-26 We are in the maintenance of engineering machinery hydraulic cylinder, often can see the inner wall of the hydraulic cylinder piston or piston rod has some honeycomb holes, which are caused by cavitation. Hydraulic cylinder cavitation damage is quite large, it will lead to the surface with black, and even support ring, sealing ring burning phenomenon, resulting in hydraulic cylinder leakage. When cavitation and other types of corrosion work together, will be several times or even several times to accelerate the main parts of the hydraulic cylinder corrosion rate, thereby seriously affecting the normal use of construction machinery. Therefore, it is very necessary to prevent the cavitation of hydraulic cylinder. 1., the main cause of cavitation The analysis of the essence of cavitation Cavitation is mainly due to the hydraulic cylinder in the work process in the piston and guide sleeve between the oil mixed with a certain amount of air. With the gradual increase in pressure, gas oil will become the bubble, when the pressure increases to a certain limit, these bubbles will burst under high pressure, high temperature and high pressure gas can be quickly applied to parts of the surface, resulting in cylinder gas corrosion, caused by corrosive damage to parts. The hydraulic oil unqualified cause cavitation To ensure the quality of hydraulic oil is an important factor to prevent cavitation. If the foam resistance of the oil is poor, it is easy to produce foam, resulting in cavitation. Secondly, the change of the oil pressure is too high and too high, which will directly lead to the formation of bubbles and accelerate the bursting speed of bubbles. Tests have shown that the pressure changes in a high frequency of cavitation erosion will accelerate. Such as hydraulic cylinder inlet, oil return