Ring Granulator vibration problem

We have a 750 KW Ring Granulator Crusher. The Crusher was undergoing heavy vibration. It was discovered that the ND Bearing radial clearance had increased abnormally. The bearing was replaced and the machine was put into operation. At no load the following vibration readings were taken in mm/sec:

ND End

H-10

V-5.4

A-5.4

Drive End

H-5.4

V-2.4

A-4.8

However when the machine was run under load the following readings were taken:

ND End

H-9.4

V-6.9

A-10.3

Drive End

H-6.9

V-4.7

A-12.8

What is the probable cause of this sudden increase in vibration in the axial direction when Machine was run under load.

 

 

 

 

 

Original Post

Dear sir ,

you have replaced bearing but what if the clearance increased due to Bearing plummer block wear in inside .You need to check the clearances once again and need to place a shim between bearing outer race and plummer block inside area .And need to check Bearings tightness on shaft .

If you have the spectrum ,please post here .So that we can understand the problem clearly .At this point according to your data , i suspect bearing looseness .

Please post your findings .

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