Rack is the most important part in the jaw crusher, which weight covers the large proportion of the whole machine. Its stiffness and strength have great influence on the service life of the machine and the main components.
As long time running and the operators’ wrong operation, the rack of jaw crusher may crack suddenly. Following, let's talk about the cracking reason:
1. During fabricating, the casting technology or the welding does not meet the requirements that appearing the quality problem caused by machine self.
2. The bolts that installed on the bearing cap are loose.
3. The jaw plate is not fixed firmly during installation, which becomes loose after long time operation, and thus striking the front part of the rack to damage it.
4. The damaged eccentric shaft and pin or the loose expansion sleeve may lead the balancing weight of flywheel face to the wrong direction.
5. The stiffness of machine foundation is bad, or the level exceeds the tolerance or collapse, all these may cause the machine bouncing.
6. The fixed jaw plate and movable jaw plate are still used with the abrasion tooth.
7. The material of toggle plate and its pad is unqualified, which cannot bear the large impacting force. When the crusher received the high impacting force, the toggle plate does not break thus causing the rack vibrating.