The proper use of the hydraulic oil - bearing knowledge

1, the factors influencing the quality of the hydraulic oil ( 1) Water. Water content of oil in water quantity according to the national standard GB/T1118. 1 - 94 technical standards, to test its quality indicators should be no greater than traces. If excess moisture in the oil, it must be replaced; Otherwise, will not only damage the bearings, also can make the rust on the surface of the steel, thus makes the hydraulic oil emulsification, metamorphism and sediment, hamper the cooler heat conduction, affect the valve working, reducing the oil filter with effective working area, increasing the abrasive action of the oil. ( 2) Oxidation. General mechanical working temperature of hydraulic oil for the 30 - 80 ℃, the service life of hydraulic oil and its working temperature is closely related to experience tells us that when the working oil temperature above 60 ℃, every 8 ℃, increase the service life of oil will be halved, which is 90 ℃ oil is the life of a 60 ℃ oil 10%, because the oil by oxidation. Oxygen and oil hydrocarbons in reaction, make the oil oxidation, color black, viscosity rise slowly, and finally may seriously to oxide can't dissolve in oil, with brown mucous layer deposition somewhere in the system, easy to plug components of the control oil duct, make the ball bearing, valve core, such as hydraulic pump piston wear, affect normal operation of system. Will a corrosive acid oxidation. Oxidation process started slowly, when after reaching a certain stage, oxidation rate suddenly accelerated, viscosity will follow suddenly rise, as a result, working oil temperature is high, the oxidation process faster, accumulated sediment and acid more and finally make the oil cannot reoccupy. ( 3) Impurities. Impurities not only can wear all the moving parts, and once got stuck in the valve core or other motion pair, will affect the normal operation of the whole system, resulting in failure of machine to produce. ( 4) The air. If gas is contained in hydraulic circuit, when the bubble overflow to form cavitation effect on pipe wall and components, the system does not work, a long time can also lead to damage of components. ( 5) The physical and chemical reactions. The tank clean paint, etc, can lead to oil chemical changes. 2, the oil inspection and maintenance of water content: 2 - release 3 cm3 oil to a test tube, stand for a few minutes to make the bubbles disappear, then the oil heating, ( If use lighter) , at the top of the tube mouth at the same time listen to whether there is water vapor slight 'peng' sound, if yes, explain oil contains water. General system of oil water content inspections on no condition, the most simple inspection method is the machine after a night of quiet place, open the oil drain screw at the bottom of the tank, let out a little oil into a container, field observation in the oil contains water. Smell and appearance: will not the used oil and all kinds of used oil sample a, in the same temperature and glass dish, if the color of the oil have a special smell, difference is very big, or instructions of used oil is bad, need to change. If there was no evident difference of two kinds of sample color and smell, the two kinds of sample can be placed one night at the same time, if precipitation appears at the bottom of the containers of oil has been used, then the system the oil must be through the fine oil filter, filter, and clean the tank. In addition, also should pay attention to oil for the following items: ( 1) , check the oil level before starting, check the oil in in the correct standby state. ( 2) Machine idle running around 5 min, check whether there are air bubbles in the liquid level meter oil exists, if it is a new car or a new change of the hydraulic oil, oil when idle in the bubble is a normal, such as bubble disappear to allow machine operation. ( 3) Pay close attention to the temperature of the oil. When the machine work after a period of time, if the oil temperature on the high side is best can stop to rest, to work again after the oil temperature is normal, to extend the service life of system with oil. ( 4) Hydraulic system should be paid attention to the various parameters of the numerical value is normal, also must pay attention to system external characteristics - - - - - - - Sound. If the air intake in the system, such as water or oil poorly, send out sound. Meter reading value abnormal fluctuations at the same time, should stop in time, at this time. ( 5) Hydraulic oil filter on a regular basis. Impurity particles in the oil control within the prescribed scope. ( 6) Replace the hydraulic oil regularly. Oil change regularly according to the requirements of machine instructions, at the same time, replace the oil filter, the conditional test, should according to the results to determine whether an oil change; Can also according to the mechanical device use space and system requirements to make oil change cycle, and the oil change period in equipment technical files. Note: when an oil change new oil with the old oil should be the same brand the same specifications, oil change, should put out all the old oil and rinse, put out of the place such as valve, hydraulic cylinder and reach of the flushing, but will return pipe road apart into temporary cans, after adding new oil, with the engine running the new oil to come out, replacement of the old oil principle is to inject new oil by not less than the oil filter system filtration precision filter, if the site is unconditional, should be in add new oil run 1 h or so after the replacement oil filter in the system; Machine after change new oil idle running, should check the oil level again, add new oil when necessary. ( 7) In the car wash or machine issue need not when, fuel tank should be covered, in case of moisture in the air to enter.