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Noknroll

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Anyone monitoring Buhler flour sifters?
I just got my first readings off two of these sifters yesterday and was surprised to see 27 mm/sec in axial orientation on both.
Sifters are suspended on cables with an eccentric belt driven weight. One of the readings we are taking is an axial reading on the fixed bearing supporting the vertical counter weight shaft. Accelerometer orientation is parallel to the counterweight shaft.
I was expecting a much lower number as the sifting motion is all radial, with an approximate "throw" of 150 mm.
pictured is a very similar machine
sifter.jpg   

Vibe-Rater

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Reply with quote  #2 
Hi Nok,

I have not dealt with these before at all.

Suspended and sifting flour, would you not expect these sort of levels? Wood chip screens are suspended as well and driven by eccentrics and produce enormous levels.

?? I don't know enough about them to be confident.  rgds
Noknroll

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Reply with quote  #3 
Thanks Vibe
Coming from the MDF industry, I've also dealt with wood chip shaker screens before but dont recall high axials like these?
Radials in velocity i dont even bother with at 400+ mm/sec
Walt Strong

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Reply with quote  #4 
I guess they really shake in all directions! All you need is a rule and a stop watch!



Walt
Noknroll

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Reply with quote  #5 
Thanks Walt, and a spirit level would be handy too......
Noknroll

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Reply with quote  #6 
Just thinking out loud, and an exagerated example might be a childs swing. If solid seat is swung side to side instead of the normal way you would get a slight lift of the seat off level as it moves through an arc and the rope suspending it effectively shortens at the end of the seats pendulum like travel
This lifting of the seat would be the axial motion.
Plausable?
MarkL

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Reply with quote  #7 
Might be something worth looking at.

The schenck 'vib2know' app is free to download for smartphones and tests vibration screen throw and severity. They have a special phone case for it that's free by mail if you contact them. I got it a few weeks back haven't had a chance to see what it can do yet.
vibe2know@schenckprocess.com



At start of video you can see guy put his phone in the case.



Walt Strong

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Reply with quote  #8 
Nice video, but the "music" wore me down!

Walt
MarkL

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Reply with quote  #9 
That's what the mute button is for sadly they have to pick unlicensed 'muzak' for these things and here's a reason why it never makes the charts lol.

As an aside have found the app works great to detect motor speed just take a reading with phone left on motor and it takes a decent reading compared it strobe.
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