The relevant structural design of the jaw crusher bearing includes: the position of the bearing relative to the frame, the axial positioning of the bearing, the bearing seal, and the bearing seat of the frame.
Bearing relative to frame position
In the height direction, the position of the eccentric shaft is called the suspension point of the moving jaw. In order to obtain a good movement path of the feeding jaw and the discharge port, low suspension or even zero suspension is usually recommended. In the width direction, the width center of the frame bearing should be as close as possible to the center of the thickness of the side frame plates.
Axial positioning of bearings
The inner side of the inner ring of the movable jaw bearing is positioned by the eccentric shaft shoulder, and the outer side is finally positioned by the shaft sealing cover with the aid of the frame bearing and tightened by the round nut. The inner side of the outer ring of the moving jaw bearing is not located, and the outer side is located by the sealing cover of the moving jaw. When the cover is tightened with bolts, the axial clearance can be adjusted with paper gasket to make it close. The cover bolts should be designed more and be as large as possible, and the axial force on the toothed plate is transmitted to the bearing through the moving jaw, which is mainly borne by the cover. It is learned from Hongxing heavy industry that once there are not enough or large bolts, the bolts here will be loose and unable to locate the moving jaw bearing. The inner side of the inner ring of the frame bearing of jaw crusher is located by the shaft seal cover on the eccentric shaft. The reliable design is that the outer side of the inner ring of the moving jaw bearing and the inner side of the inner ring of the frame bearing adopt the same seal cover. The cover span on the eccentric shaft must rotate with the shaft and will not heat up due to relative rotation.
Bearing seal
When the bearing is lubricated with grease, the jaw crusher generally adopts a labyrinth seal. According to the sealing position, the labyrinth can be radial or axial. Generally, radial seals are easier to arrange. For large-size jaw crushers, due to the large deflection of the eccentric shaft, it is easy to cause maze collision, and a larger gap is used. In order to strengthen the labyrinth sealing effect, a grease adding hole can be specially provided at the labyrinth, and hard grease can be added to seal the bearing.
Frame bearing
The movable jaw bearing is installed in the bearing hole of the movable jaw, and there is no single bearing seat, but there are two kinds of frame bearing seats: split type and integral type. Because the main stress direction of the frame bearing of the jaw crusher tends to deviate about 15 ° from the vertical line direction, it is not suitable to use the upper and lower split type bearing seats horizontally, especially the large-scale bearings, otherwise, under the inclined heavy impact load, split type bearing seats can be used The inner hole of the bearing pedestal will be deformed by the lateral force, which will destroy the bearing.
As a supplier with nearly 30 years' manufacturing, Shuguang Heavy Machinery also produces and sells hammer crushers, impact crushers, vertical shaft crushers, cone crushers, compound crushers, Raymond mills, high pressure mills. Powder machine, vertical mill, ultra-fine grinding machine, ball mill, double-shaft shredder and other heavy equipment crusher. Feel free to contact us for more details.
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