Crushing, Screening & Conveying

Crushing, Screening & Conveying

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Cone Crusher Shaft Broken (4 replies)

S
balan@ce
4 years ago
balan@ce 4 years 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
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David
3 years ago
David 3 years ago
(unknown)
3 years ago
(unknown) 3 years 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.

Proman
11 months ago
Proman 11 months ago

There may be Non-uniform rotation of transmission shaft.

Causes:
-serious wear or damage of gears
-damage of connection keys
-breakage of spindle

Solution:
-stop and replace gears, and make meshing clearance meet the requirements
-change the connection keys
-change the spindle, strengthen iron removal work

S
Smilewei
10 months ago
Smilewei 10 months ago

There may be several reasons:
1. Fatigue failure
2. Overloading
3. Material issues
4. Improper maintenance
5. Foreign objects

In order to prevent the cone crusher shaft from breaking, the following points need to be done:
1. Make sure the crusher is operating within its recommended capacity and feed size limits.
2. Shaft construction using high quality materials and ensuring proper heat treatment.
3. Implement a regular maintenance and inspection program, including lubrication and component inspection.
4. Install effective metal detectors or magnetic separators to keep out ferrous or uncrushable materials.
5. Closely monitor the operation of the crusher, and deal with any abnormality or abnormal vibration in time.

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