I have used a horizontal rake dryer for 2 years. What would be the reason if the shaft broke?
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There is a horizontal rake dryer that has been used for 2 years. 5-meter-long horizontal mixing shaft, the solid shaft is inserted into the hollow shaft 500mm. The solid shaft and the hollow shaft use expansion joints. After heating the hollow shaft, insert the solid shaft into it. Now the part where the solid shaft and the hollow shaft meet is broken. As shown in the yellow circle in the picture, what could be the reason for the shaft to break. Insufficient strength or fatigue fracture.
Usually caused by overload. The rotating speed of the stirring rotor is very slow, and there are no factors such as dynamic balance and vibration that can damage it. Only if the viscosity of the material exceeds the standard, foreign matter in the material, hardening of the material, and factors that can cause the rotor to get stuck may cause it to be damaged. It is recommended to check these aspects. If corrosion and metal fatigue occur, they will show up at the break marks. Oh, and bearing damage can also cause this kind of consequences.
Vibration leads to metal fatigue, thermal expansion and contraction, external force, and the combined results
Fracture is not a strength problem. There is no brittleness problem with 45# steel. It is usually caused by fatigue. When this happens, it is time to consider process improvement and equipment selection and modification.
It is obviously a stress concentration point and should be strengthened at this point.
It is a stress concentration point. Fatigue and overload can easily cause fracture. Can you analyze the cross-section?
This problem is usually caused by fatigue.
Fatigue fracture is very likely. You can see the fracture surface at a glance and it is easy to judge.