The invention relates to an oil filtering method adopting
magnetization, adsorption, a
rotating magnetic field and centrifuging and used for a hydraulic
system. According to the oil filtering method, a U-shaped
particle separation module is used for achieving separation of
solid particles so that the
solid particles in oil liquid can move towards the
pipe wall, at the position of an outlet of the U-shaped
particle separation module, oil liquid, rich in
solid particle, nearby the
pipe wall flows back to an
oil tank after entering an oil return
barrel through an oil inlet
pipe of an oil return
barrel module, oil liquid, containing a micro quantity of small-particle-size particles, at the center of a pipeline enters an inner
barrel through an oil inlet pipe of the inner barrel to be subjected to high-precision filtering, the service life of a
filter element is prolonged, and the filtering cost is reduced; the oil liquid entering the oil inlet pipe of the inner barrel flows into a
spiral flow channel of the inner barrel in a tangent inflow manner, the inner barrel wall is provided with the
filter element, filter liquor is closely attached to the
filter element to flow under the effect of
centrifugal force, the filter liquor fast flows parallel to the surface of the filter element, and filtered hydraulic oil flows out to an outer barrel in the direction perpendicular to the surface of the filter element; and
pollution particles deposited at the bottom of the inner barrel are discharged to the oil return barrel through an electronic control
check valve, and the service life of the filter element is prolonged.