As a kind of hydraulic parts, hydraulic filter is very important. Hydraulic filter is generally composed of filter element and shell, the role is to filter the hydraulic system in the emergence of various impurities. Its sources are mainly after cleaning still remain in the hydraulic system of mechanical impurities, such as rust, sand, welding slag, iron filings, paints, paint skins and cotton debris, etc., external impurities into the hydraulic system, such as through the refueling port and dust ring and other places into the dust; work process impurities. Thus protecting the safe operation of the equipment and extending the life of the equipment, so the hydraulic filter plays an important role in the entire hydraulic system, and timely replacement of the filter element can make the equipment run more well.
According to the installation position in the hydraulic system, the hydraulic system oil filter element is divided into suction line oil filter element, pressure line oil filter element and return line oil filter element.
(1) Suction line hydraulic oil filter element. Suction pipeline (tank a hydraulic pump inlet) or directly in the tank to install suction oil filter element is necessary for the protection of the hydraulic pump, its accuracy is generally 100 ~ 180μm.
(2) pressure line hydraulic oil filter element. Pressure line oil cartridge, not only to protect its downstream components, as a guarantee of the system oil pollution degree of the main oil filter, through its own efficient purification of the oil, the hydraulic pump also plays a good protective role, the filtration accuracy of 5 ~ 10μm.
(3)Return line hydraulic oil filter element. Various types of components in the working process, produced by the abrasive particles and other dirt can be intercepted by setting the return pipeline oil filter, to avoid returning to the tank again, once again by the hydraulic pump inhalation. The allowable differential pressure of the return line oil filter ranges from 0.3 to 0.5 MPa according to different pressure levels.
Selection of hydraulic filters should follow the correct method:
(1) Look at the filter material: high-quality filter material is generally made of glass fiber, with good anti-vibration and pressure resistance, and long service life, while the inferior filter material has a short service life and worse anti-vibration and pressure resistance.
(2) Poor quality filter element is not compact, good filter material between compact and even and neat.
(3) High-quality cartridge shields are larger in size and heavier in mass.
(4) In order to have a deeper understanding of the difference between the hydraulic system cartridge and the poor quality cartridge in use, the two cartridges will be put into the tank pressurized, so that the cartridge rotation, in the same work situation to observe the filtration of the two cartridges.
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