The magnetic filter is composed of strong magnetic material with high coercivity and blocking filter mesh. Its adsorption force is ten times as much as that of ordinary magnetic material. It has the ability to absorb micron-sized ferromagnetic pollutants under instantaneous liquid flow impact or high flow velocity, and can overcome the re-absorption of ferromagnetic pollutants under high-speed and high-impact. Attachment, thus avoiding the jamming or abrasion of hydraulic components, prolonging the service life of hydraulic components and hydraulic systems, and enhancing the reliability of hydraulic systems. Its center is a cylindrical permanent magnet. The outer part of the magnet is a cover made of non-magnetic material. There are several iron rings around the outer part of the cover. The iron rings are connected by copper bars, and each iron ring keeps a certain gap between them. When the ferromagnetic impurities in the hydraulic medium pass through the gap between the iron rings, they are absorbed on the iron rings, thus playing a filtering role. In order to facilitate cleaning, the iron ring is divided into two halves. When impurities block the gap, the iron ring can be removed and cleaned, and then installed for repeated use. The magnetic filter element can also be combined with other filter materials to form a filter element for paper filter on the oil return road. The filter cartridge is made of inner and outer cartridges and oil filter paper clamped in the middle. The inner and outer barrels are rolled up with thin steel plates and punched with many oil-permeable round holes. The filter paper is folded into stars to increase the flow area. The central pull rod of the filter element is equipped with a magnetic filter element composed of many magnetic rings and nylon separators.
In recent years, with the increasing development of China's automobile industry and household appliances industry, most domestic automobile and household appliances manufacturers have begun to pay more and more attention to the surface cleanliness of steel plate. Cold rolling and degreasing cleaning are two main production processes affecting strip surface cleanliness. In cold rolling, in order to lubricate and cool the rolls, emulsifiers (mainly rolling oil) are sprayed on the surface of strips and rolls. On the other hand, due to the grinding of rolls on the surface of strips, a large amount of iron powder will be produced and adhered to the strips. But in the cold rolling process, the residual rolling oil can be easily removed by using suitable rolling oil and optimizing rolling process. The residual iron powder is difficult to remove because of its inherent characteristics. Therefore, the control and removal of the residual iron powder on the strip surface is the cleanliness of the strip surface. Difficulties in control. Practice has proved that in the process of cold rolling production and degreasing cleaning, there are many ways and means to control and remove the residual iron powder; in the process of degreasing, the proper rolling oil should be selected, the reduction rate of each stand (or pass) should be reasonably allocated, the working mechanism of roll chromium plating and magnetic filter should be selected; and in the process of degreasing, the working mechanism of roll chromium plating and magnetic filter should be selected. Suitable degreasing fluid, strengthening brush roll brush, adjusting cleaning temperature and speed, and working mechanism of magnetic filter, etc.