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fburgos

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Reply with quote  #1 
In our plant we have four cranes critical to operation, Im given the task of monitoring this motors and gearboxes, but I've been avoiding monitoring because I don't want to climb up the crane dancing around the drum and do the measurements.


Im thinking whats the best way of monitoring this machines.

- Permanent Overall vibration display (4-20mA switches or similar)


- Permanent Sensors and labeles/panels for portable data collector.


any experience with both aproaches, pros/cons?
ruben

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Reply with quote  #2 
We have been monitoring Cranes for heavy Industry (steel) since 7 years ago.

The work method we use making routes with portable collectors.
1. Choose the real bottleneck.
2. To get all the possible documentatión about every motor and gearboxes (rpm,bearings, gears teeth, electrical etc)
3. Choose a good condition for measurement. We made a flat steel weight to hook in all the cranes (3 tons) to take advantage of the possible height of travel
4. Select the measuring points.
5. Account work hours for every crane in order to design the measurement frequency.
6. Measurement lifting and lowering the weight.

The Spectrum are usually of good quality. I use 1600 lines resolution even for the slow shafts to get the best quality for the spectrum, demodulation and wave form.

In parallel to this work we do oil analyzes to improve reliability with both techniques.

Danny Harvey

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Reply with quote  #3 
Ruben,

Very helpful tips. I'm not sure I understand item 1 in your list, though.

Do you work on the drive platform or do you have remote sensors?

Do you collect a complete set of data for both raising and lowering?

Do you see significant differences in the spectrum between raising and lowering?


fburgos

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Reply with quote  #4 
Quote:
Originally Posted by Danny Harvey

Do you collect a complete set of data for both raising and lowering?

Do you see significant differences in the spectrum between raising and lowering?




I was thinking is necesary to make both measurements and diferentiate each other, since this machines use both sides of the gear teeth.
John from PA

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Reply with quote  #5 
Quote:
Originally Posted by fburgos


I was thinking is necesary to make both measurements and diferentiate each other, since this machines use both sides of the gear teeth.


By the way, is this a worm gear drive or helical and/or bevel?  If it is a worm gear drive there is some special info needed to get the frequencies.
fburgos

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Reply with quote  #6 
This are "regular" gearboxes with helical or straight gears
MarkL

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Reply with quote  #7 
Had to look around a bit for this one, I knew I had seen it somewhere before. I think they are based in Australia....they have a system that allows you to remotely collect with an analyser over a wireless connection.

https://gvsensors.com.au/wp-content/uploads/2014/07/GV-700-VIBE-PORT-Inner-Race-Fault-WP.pdf

Maybe Nok, Vibe or Sinski are familiar with them? 
Noknroll

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Reply with quote  #8 
Quote:
Im thinking whats the best way of monitoring this machines.

- Permanent Overall vibration display (4-20mA switches or similar)


- Permanent Sensors and labeles/panels for portable data collector.


Permanent Overall isnt going to give you information to analyse.

i'd definitely go with option 2 for portable data collector, then you can apply the full range of analysis parameters required and in a safe location while collecting the data.

GV sensors, that MarkL linked to are a good mob to deal with, although I haven't researched wireless sensors in any great detail, the principal is sound though
OLi

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Reply with quote  #9 
There used to be some guys out of Knoxville that specialized in this they collected at a repeatablel speed going up and down to get good data and don't forget to load the crane so you get load on the gbx's and how about the "traction" wheel bearings? I have rarely done but did it this some time back with a old slow box and we used the test load for the crane and run up down as many times required to collect the data. Not perfect but better than nothing. I think 1 above is that you should first look at the crane that is most critical for the plant.

We have seen a couple of cases where outgoing shaft fatigue and fails in 30 years but that may be tricky to detect. In one case it was detected and in the data but the use of the crane did not stop in time, it was the unloading from a papermachine but it was ok, roll bounced a little and got compacted.....

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Shoveldr

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Reply with quote  #10 

I have a lot of experience in the mining industry dealing with shovel, draglines and cranes and actually developed an online solution for these, that I'm not going to try to sell you. 

Here is a Pdf that summarizes the systems on the crane, I apologize for specifying hardware, but it was written based on a specific solution.  https://drive.google.com/open?id=17Eod0eUSOj0IK1edJDxdWfRVd-4AKVKg

Here is a presentation I did on data collection on cyclic systems based on my experience with mining equipment, it directly correlates to bridge cranes.  https://drive.google.com/open?id=1hdoK5PFDBSN74-KcwujTab0aCQa430FM

fburgos

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Reply with quote  #11 
Thanks for the information I'll take a look at the computer.
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