Often said that the seal is to maintain good lubrication NSK bearing, and to prevent the cooling water, scale, immerse the impurities of the work surface to extend the service life of bearing.
Because the rolling mill bearing seal, bearing damage is the most close to the body side bearing parts, often because of grease pollution, erosion, make parts work surface wear, spalling and fracture, especially for cold strip mill emulsion penetrates, the failure of grease faster.
NSK bearings seals with seal and outer seal two. External seal mainly uses the design of labyrinth and contact combination. Maze level more ( not less than two ) gap smaller seal effect to be better. Labyrinth clearance according to the bearing size and radial unilateral 0.6 ~ 1.5mm, 4 ~ 6mm; axial.
Contact skeleton oil seal in the mill is widely used, in order to increase the effect can be two or three parallel use. But it should be noted that the oil seal has the direction, can not hold against. The hot-rolling mill general attire two oil, two oil seal lip mouth must to the bearing seat outside, prevent the outside contamination to immersion. However, a seal lip usually installed three seals near bearing cold strip rolling mill 's mouth to inward, to prevent influencing the quality of rolled products grease overflow. Be careful to use the oil seal, avoid installs when the roller damaged lip, sealing effects.
RBR type sealing ring is a kind of rolling mill bearing special-purpose rubber lip type sealing ring, widely is applied in recent years. The RBR sealing ring using the axial sealing mode, the mouth is affixed to the cover surface, not by the old grease bearing internal influence of roll beating can overflow, impurity cooling water, scale, external is lip block access to, has the good seal effect. Easy to use, change when you roll into roller bearing without any influence.
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