The shaft of the granulator has broken; the cause is unknown. I hope experts can offer some guidance
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As shown in the diagram, this shaft has lasted about a week, while the previous shaft only lasted half a month. Initially, it was suspected to be a quality issue, but it seems that the problem lies not with the shafts themselves.
The load is too large, exceeding the shaft’s bearing capacity. First, check whether the material selection is appropriate and whether it is made from low-quality materials; second, verify whether the shaft diameter is reasonable!
Stress concentration; fracture occurs at the step, with a clean fracture surface.
Is it because the edges at the steps don’t have rounded corners?
Granulator? That’s too general – is it a polyethylene plant? Polypropylene plant? Which manufacturer produced it?
The material appears to have an issue based on the color of its end face