CN
In the hydraulic system, most of the faults are caused by hydraulic oil pollution and impurities in the oil. Therefore, the control of oil pollution in the hydraulic system can basically ensure the normal and stable operation of the system. To prevent oil pollution in the hydraulic system, on the one hand to prevent external impurities into the hydraulic system, on the other hand, choose a suitable hydraulic oil filter device, do a good job hydraulic oil filter. To prevent external impurities from entering the hydraulic system, the first thing to note is that the hydraulic tank is well sealed, using good performance of the air filter. Try to avoid direct contact with the external environment hydraulic oil.
Before the hydraulic system is assembled, thoroughly clean the fuel tank, installation line, tubing and fittings to avoid residual processing iron filings. When injecting new hydraulic fluid, it must be filtered before it is added to the tank. The filter in the hydraulic system is an important device to remove impurities in the system and ensure the cleanliness of hydraulic oil. According to the installation location, working environment and so on, when choosing the hydraulic oil filter should pay attention to the following aspects: in the hydraulic oil pump suction port location should choose the filter accuracy slightly lower, the flow of large filter, if the flow of the filter is insufficient, easy to cause the position of oil absorption hole. The position of the filter arranged in the hydraulic pipeline is generally upstream of the more sensitive hydraulic components such as the solenoid valve. And to ensure that the accuracy of the filter is higher than the hydraulic components with clearance. At the same time consider the pressure of the hydraulic system, select enough pressure filtration equipment. The pressure resistance of return oil filter is generally low. When selecting the type, the return oil flow of hydraulic system should be fully considered to avoid the back pressure phenomenon caused by insufficient flow of filter equipment. In the hydraulic system, such as solenoid valve and other internal mechanical movement of the components, its spool and the valve body shoulder clearance is very precise. Once there is a small impurity into the fit gap, it is easy to cause solenoid valve spool in the round-trip movement of the surface wear, and once wear occurs, the surface gap increases, will soon lead to further serious friction, can lead to rapid failure of solenoid valve. Therefore, the selection of hydraulic filter should fully meet the hydraulic components of the filtering accuracy requirements.
The main function of the hydraulic oil filter oil is the direct medium of the hydraulic system, all the power and operation control of the hydraulic system are transmitted by the hydraulic oil, the main parts that cause the deterioration of hydraulic oil are the impurities caused by the wear and tear of the hydraulic oil filter element of the hydraulic oil tank and the hydraulic parts (such as the hydraulic pump, the hydraulic motor, the various control valves, etc.) , the analysis is as follows: 1, hydraulic oil tank is to provide hydraulic oil, cooling, precipitation impurities and discharge hydraulic system air place: first, insufficient supply of hydraulic oil will lead to hydraulic oil, pump suction, suction first will make the hydraulic oil pump oil supply insufficient, directly lead to hydraulic oil pump wear and tear, soon make the hydraulic oil pump seriously damaged to scrap; The volume efficiency of the hydraulic oil pump and other working devices is reduced, and the working efficiency of the whole hydraulic system is reduced. At the same time, the air in the hydraulic oil is compressed in the work of the oil pump and the working device to form the compressed gas, when the explosion reaches a certain pressure, the formation of air pockets will cause damage to the sealing surface, but also make the oil pump and working device wear very quickly. The method of prevention is to always check the hydraulic oil in the hydraulic oil tank, to ensure that the amount of hydraulic oil in the normal range.2. The filter element of hydraulic oil in the hydraulic oil tank overruns the time, the impurity in the hydraulic oil adsorbs on the filter element surface, which causes the filter element to be blocked and also causes the oil pump to absorb the insufficient oil to produce the vacuum. Regular replacement of hydraulic oil filter element is the most effective preventive method. 3, the use of hydraulic oil is too long not to replace, hydraulic oil impurities (iron chips, copper chips, dust, etc.) will accumulate more and more, at the same time the fine particle size will be smaller and smaller, such impurities are sometimes invisible to the naked eye and are very small, and can easily pass through the hydraulic oil filter, and the hydraulic oil is used for too long, the various characteristics of hydraulic oil, such as lubrication, viscosity, anti-wear, stiffness, etc. , will be reduced a lot, the impurities in hydraulic oil, through the working cycle to the various working devices and control elements, directly lead to the whole hydraulic system hydraulic components of the rapid wear.
The method of prevention is the regular replacement of hydraulic oil, or regular sampling test, found that the standard should be replaced in a timely manner. Oil filter element classification and function oil filter element is mainly used in the hydraulic system of oil filtration, installed in the hydraulic system of the filter and oil filter. According to the installation position in the hydraulic system, the hydraulic oil filter element is divided into oil filter element of suction pipeline, oil filter element of pressure pipeline and oil filter element of return pipeline. The classification and different uses of oil filter element: 1) oil suction pipeline hydraulic oil filter element oil suction pipeline (hydraulic pump inlet) or directly installed in the oil tank oil filter element is the necessary measure to protect the hydraulic pump, its accuracy is generally 100-180 microns, depending on the pump self-suction capacity to determine, the flow resistance is too large to cause cavitation pump. 2) oil filter element of pressure pipeline hydraulic oil filter element of pressure pipeline is not only to protect its downstream components, as the main oil filter to ensure the system oil pollution degree, through its own highly efficient purification of oil, also plays a very good protection role to the hydraulic pump, the filtering precision is 5-10 microns, the pressure of the filter is big, the vibration is also very harmful, the allowable pressure difference of oil filter element of pressure pipeline, according to different pressure levels, in the range of 0.3-0.7 mpa.