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OLi

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Reply with quote  #1 
Anybody having followed XNip "shoe press" vibration trend increase? It is 5-6 years so I have limited data. It once broke some internal bolts and fell down w/o warning in the readings a couple of months before (ouch!). I have limited info on what is inside the black box. Signature is one peak that increased in driveside data. Anybody seen that before? It is the first time vibration made any change in this thing.
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Sinski

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Reply with quote  #2 
Is this a "Shoe Press" from a paper machine?

We have a Voith Flexo Nip on the machine I work on but never had any issues with it. We have had with its mating roll though.
OLi

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Yes it's a tissue machine so it runs against the Yankee with a standard suction roll beside it. It is a like 5+ years old machine and this is the first sign of vibration on it. I think it is a Voith device also but the machine is from Austria. I am a bit curios about what's inside the black box are there rotating things? A lot of cables and hydraulics anyway.
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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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Sinski

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Nothing rotates inside the roll. It is a series of shoes inside a sleeve that pushes against the Yankee. Hydraulics are there to control the oil to and from the shoes to achieve the correct pressure. We have no cables coming from our roll and only hydraulic hoses so not sure what else would be controlled on the one you are looking at. 

View the attached link to a Voith video that explains its operation. 

http://www.voith.com/en/products-services/paper/nipcoflex-t-44509.htm

OLi

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Reply with quote  #5 

Thank's now I understand, it was something like that I expected. Yes we have a multi wire connector going inside that totally broke once.

We do have a long term problem with the hydraulic pumps that maybe will be able to get out there if they really go bad, who knows.
They are 1 set with a back up set shifting every machine restart. In each set one pump is fine one is half bad and one is real bad.
Replacing and pampering the coupling on the bad ones make them half bad for a while. So if some pump is having real problems maybe it can 
propagate. They were replaced by bigger units when machine was new as the first set was to small.

There are some material inside that is against the tissue, maybe it can get worn, should be some friction?
Machine is Andritz but I don't find the square box type of device they put there but they work about the same I guess. Electrics may be a profile measurement system of some kind.


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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
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