Crushing, Screening & Conveying

Crushing, Screening & Conveying

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Cone Crusher Shaft Broken (2 replies)

S
balan@ce
8 months ago
balan@ce 8 months ago

Hello,

The shaft in question is very similar to the Metso GP100S and the shaft has broken as in the attached picture. The vitals were good and the crusher was beginning to give some odd sounds before the operator found that the shaft was broken. Any expert advice on how to proceed failure analysis would be greatly appreciated.

img-20200921-wa0006
https://www.911metallurgist.com/wp-content/uploads/2020/09/IMG-20200921-WA0006.jpg
David
7 months ago
David 7 months ago
(unknown)
3 months ago
(unknown) 3 months ago

1. The structure design is unreasonable. If the interference between the main shaft and the moving cone is too large, there is no unloading groove, and the transition fillet is too small, the main shaft is prone to stress concentration, resulting in fatigue damage to the main shaft. Or the diameter of the main shaft is small, and the main shaft is more prone to break when there is "over-iron" phenomenon in the equipment.

2. The manufacturing quality is not good. In the process of manufacturing the main shaft, the failure of heat treatment reduces the fatigue strength of the main shaft material, and it is easy to produce resistance when encountering unbreakable objects, causing the section to gradually crack, and the main shaft may break in unexpected situations.

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