Why the hydraulic cylinder of construction machinery will be cavitation       

 The air into the hydraulic cylinder fault will cause you know? Cavitation is produced, we should prevent from what? That's what this article is going to talk about.

Hydraulic cylinder cavitation damage is quite large, it will lead to the surface of the black, and even support ring, sealing ring burning phenomenon, resulting in hydraulic cylinder internal discharge. When cavitation and other types of corrosion together, will be several times or even several times to accelerate the corrosion speed of the main parts of the hydraulic cylinder, thereby seriously affecting the normal use of construction machinery. Therefore, the cavitation corrosion of hydraulic cylinder for the prevention, it is necessary to.

The analysis of the essence of cavitation

Cavitation is mainly caused by a certain amount of air mixed into the oil between the piston and guide sleeve during the working process of the hydraulic cylinder. 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 the 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 frequency of oil pressure is too high and too high, which will directly lead to the formation of bubbles and accelerate the bubble rupture velocity. The test proved that the high frequency parts of the pressure change will accelerate the rate of appearance of cavitation. Such as hydraulic cylinder inlet, return port, etc., due to the relatively high frequency of pressure change, cavitation degree is relatively higher than other parts. In addition, oil overheating will also increase the risk of the occurrence of cavitation.

The improper manufacturing and maintenance lead to cavitation

In the assembly or maintenance, the hydraulic system is not fully discharged, resulting in the existence of gas in the system, under high temperature and high pressure can produce cavitation.

The coolant quality problems cause cavitation

When the coolant contains corrosive medium, such as a variety of ions and oxidants, are prone to chemical and electrochemical corrosion, in their combination, will accelerate the speed of cavitation; if the cooling system maintenance well, can prevent the occurrence of cavitation. For example, if the pressure cap of the radiator of the cooling system is maintained well, the coolant pressure of the radiator will always be higher than the vapor pressure, so as to prevent cavitation. Again, the thermostat of the cooling system; a good thermostat can keep the coolant in a suitable temperature range and reduce the energy released by the bubble rupture.

The prevention of cavitation, it starts from the causes. Strict hydraulic oil selection, to prevent the oil temperature is too high, reduce hydraulic impact, keep the hydraulic components of the joint surface normal clearance, maintenance should pay attention to the exhaust, these can effectively avoid cavitation phenomenon.