The moving cone of the cone crusher does not have the normal number of swings and strokes, and the rotation per minute exceeds the specified number of rotations. These are all signs of failure of the crusher, and the oil in the spherical bearing will be thrown out and enter. The ore in the crushing cavity will collide everywhere and cannot operate normally, and the crusher cannot play the role of crushing the ore. In severe cases, the spindle and other components will be damaged, affecting normal work.

The main reasons for the above failures are as follows:

• 1. Poor fit between the bowl tile and the conical spherical surface

Because the crusher works in a dusty and vibrating environment for a long time, the spherical body of the moving cone wears the bowl tile for a long time, so that the thickness of the bowl tile gradually decreases, the inner ring of the bowl tile contacts, and the moving cone descends, thus destroying the moving cone Stable working conditions change the normal running trajectory of the cone.

• 2. Poor contact between taper spindle and taper bushing

The contact between the taper bushing and the main shaft is characterized by large upper journal and small assembly clearance, small lower shaft diameter and large assembly clearance, and the main shaft and the taper bushing are in uniform contact along the entire length or along the upper half of the taper bushing. At this time, the cone can run stably and normally. When the eccentric bushing is deflected in the straight bushing and the contact between the main shaft and the tapered bushing is poor, the flying cone and the bushing will be broken.

• 3. The gap between the components is not properly sized

The main installation clearance of the crusher includes the clearance between the body sleeve and the vertical shaft, the main shaft and the cone bushing. During the normal operation of the crusher, a reliable lubricating oil film should be formed between the friction surfaces to compensate for the manufacturing and assembly errors of the components to prevent thermal expansion and deformation, and there must be appropriate clearances between the surfaces.

• 4. Poor lubrication

During the operation of the crusher, the friction between the surfaces that are in contact with each other and move relatively requires the intervention of lubricating oil to form hydrodynamic lubrication. Sufficient lubrication of the machine will improve the friction between parts, reduce wear and ensure the normal operation of the machine. However, if the oil temperature, oil pressure and oil volume of the lubricating system are not enough, especially if the working environment of the crusher is harsh and the dust is large, if the dust-proof system cannot play its due role, it will seriously pollute the lubricating oil and cannot form an oil film, so that the lubricating oil cannot be formed. Not only does it not play a lubricating role, but it will aggravate the wear of the contact surface.