1. Material issues
The material of flywheel and pulley is generally gray cast iron, because of its low cost and easy processing. However, the shortcomings of gray cast iron are brittleness, poor mechanical properties, and cracks easily caused by external forces.
2. Operating conditions
Affected by the mining process, the ore blocks entering the jaw crusher are relatively large, and the jaw crusher
or the ore-drawing machine is prone to be stuffy. Sometimes it has to be treated with explosives, which inevitably has an impact on the crusher and even the flywheel. , Cracks will appear over time.
3. Design and manufacturing process issues
The crack is at the transition of the casting fillet, the wall thickness difference is large, the transition fillet is small, stress concentration is prone to occur after pouring, and cracks are prone to appear after loading. The casting fillet is not suitable for selection, which will cause shrinkage and cracks during pouring, resulting in stress concentration. All of the above problems will gradually show up due to stress problems during operation and cracks will appear.
Due to the harsh working environment and medium conditions of the jaw crusher, some problems will inevitably occur during use. Flywheel cracks are often treated by welding repair methods, although its cannot be fully restored, but production can be resumed in a short time. However, if the crack reappears, it will be discarded, which is also what users need to pay attention to.