construction machinery hydraulic cylinder cavitation prevention

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The quality of the hydraulic cylinder has an important effect on the use of

efficiency of construction machinery. In the hydraulic cylinder for construction

machinery, maintenance, and we often can see the hydraulic cylinder wall, piston or

piston rod s urface some of the honeycomb of cavities, which are caused by

cavitation.hydraulic hose cutting machine
The hydraulic cylinder of the hazards of cavitation is quite large, it will lead to

the mating surface is black, even the support ring, the ring of burnt phenomenon,

resulting in the hydraulic cylinder to produce within the vent. Will be times when

cavitation and other forms of corrosion common even several times to accelerate the

corrosion rate of the hydraulic cylinder parts, which can seriously affect the

normal use of construction machinery. Therefore, the hydraulic cylinder cavitation

for targeted prevention is essential.hydraulic machines
A. The main reason for a cavitation
(1) cavitation substantive analysis
Cavitation generatio n, mainly due to the hydraulic cylinder in the course of their

work in a certain amount of air mixed with the oil between the piston and the guide

sleeve. As the pressure gradually increased, the gas oil which will turn into

bubbles, these bubbles occur in the high-pressure role of rupture when the pressure

rises to a certain limit, and thus the rapid effect of high temperature, high

pressure gas to the surface of the parts, resulting in the hydraulic cylinders to

produce cavitation, resulting in corrosion damage to the parts.hose crimping machine
(2) of hydraulic oil of inferior quality lead to cavitation
Ensure the quality of hydraulic oil, is an important factor to prevent cavitation.

If the anti-foaming of the oil, it is prone to bubbles, resulting in the occurrence

of cavitation. Second, the rapid changes in frequency of the fluid pressure is too

high, will also be a direct result of the formation of bubbles, to accelerate the

rupture speed of the bubbles. The test proved that the site of high frequency

pressure changes will accelerate the speed of the cavitation. Such as hydraulic

cylinder into the return oil port at a relatively high frequency of pressure

changes, the extent of cavitation is relatively higher than other parts. In

addition, oil overheating will increase the probability of occurrence of cavitation.
(3) the manufacture and improper maintenance lead to cavitation
Not pay attention to the hydraulic system, full exhaust, resulting gases present in

the system can produce cavitation in the high temperature, high pressure role in the

assembly or maintenance.
(4) the quality of coolant cause cavitation
When the coolant containing corr osion media, such as a variety of radical ion,

oxidants, and are prone to chemical, electrochemical corrosion, in their joint

effect will accelerate the speed of the cavitation; if the cooling system is well

maintained, can be prevent the occurrence of cavitation. For example, the cooling

system radiator pressure cap, well maintained, you can make the radiator coolant

pressure is always higher than the vapor pressure, thus preventing the generation of

cavitation. Again, the thermostat of the cooling system; a good performance of the

thermostat allows the coolant maintained at a suitable temperature range, we can

reduce the energy released when the bubbles burst.
 

Two. Measures to prevent cavitation

Although the causes of cavitation are many, but to take the necessary measures to

actively prevent the phenomenon of cavitation or avoided. The following causes

cavitation, talk about the precautionary measures.
(1) strict hydraulic oil selection off
In strict accordance with the hydraulic oil standard oil. The selection of good

quality hydraulic oil, can effectively prevent the hydraulic system, air bubbles

appear in the course of their work. In the selection of oil should be selected

according to different regions of minimum temperature, and filling hydraulic oil

dipstick standard, should also keep the hydraulic system clean (filling hydraulic

oil should be to prevent moisture and other impurities into the ), regular checks of

hydraulic oil, oil, oil level and oil color, blisters, bubbles, or fluid becomes

milky white, should be carefully find the source of oil in the air, and in a timely

manner to eliminate hydraulic oil.
(2) oil temperature is too high, reduce hydraulic shock
Ration al design of the cooling system to prevent the oil temperature is too high, is

the key to keep the hydraulic oil temperature normal. If an exception occurs, you

should find out the reasons, and remove. Manipulation of the hydraulic joystick and

distribution of valves, we should strive to smooth, not too fast, too fast, and it

is not frequently increase the engine throttle to minimize the impact of the

hydraulic oil hydraulic components. Also, in a timely manner to maintain the cooling

system, cooling system temperature maintained at the proper range in order to reduce

the energy released when the bubbles burst. Does not affect the normal circulation

of the coolant at the same time, you can add certain quantities of anti-corrosion

additives to inhibit corrosion.
(3) of the hydraulic components of the normal gap of the joint surface in the

manufacture or repair of the hydraulic cylinder parts (such as cylinder, piston rod,

etc.) should be in accordance with the lower limit of the tolerances of the assembly

size.