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Hello all,

I am involved in the online condition monitoring of equipment in my job role. I need to estimate the right amount of sensors that are needed to be installed on multistage gearboxes of rotary Kiln, Raw Mill, and separator. It would be great if some experienced guy can point out where are the measurement points located on the gearboxes or what is the standard location for measuring the vibration of the gearbox. I am hoping to use a tri-axial vibration sensor which will cover (2 radial and 1 axial direction).

Thank you. A quick response will be highly appreciated.

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@Registered Member posted:

Hello John, Thank you so much for your response. However, what do you mean by shaft extension, it is not obvious to me. Could you elaborate more and also e.g. Kiln gearbox should have how many tri-axial vibration sensors?

Extensions are the drive ends, the points where the shafts penetrate the housing.  But the graphic you have now posted already shows a nice complement of transducers.  Is this what you have and you are trying to go to triaxials?

@Registered Member posted:

Hey John,

How about planetary gears stages. For example , for one stage (including sun gear, planetary three gears and pionion shaft). Would One tri axial sensor suffice the requirements if place outside at the covering?

If you mean a true planetary arrangement (non-rotating ring or annulus), then a triaxial could be used.  Probably best to mount at the bottom if you have access.

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Last edited by Registered Member
@Registered Member posted:

thanks. I meant for this type of arrangement. Like 2 back to back rotating ring.

Just to clarify, I do not think you have a situation of a "back to back rotating ring".  First of all I would doubt that FLSmidth/Maag Gear would refer to the arrangement as a 2-stage planetary if the ring was rotating.  Specifically use of the word planetary refers to a very specific arrangement having a stationary ring gear (sometimes called annulus).  A planetary arrangement is one type of epicyclic.  See the PDF I posted earlier for the other types

I have attached another graphic from FLSmidth/Maag Gear that shows the 2-stage planetary arrangement.  I think it shows a bit more clearly the stationary ring gears for the 1st and 2nd stages.

As far as instrumentation, with a planetary arrangement you generally can only get instrumentation on the outside of the ring gear.  In your case about the best you can do is get it as near as possible to the ring gear.  I would suggest you approach FLSmidth/Maag for the anticipated frequencies and perhaps do a scan with a hand held device to see if you can find locations that seem more sensitive.  The other thing is to look back at the failure history of the vertical drive and make that determine the importantUntitled points to monitor.

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Last edited by Registered Member

Yeah that would be difficult as the part is rotating as well. However, around there is a catch here. I hope you will get my point and correct me if I am wrong. In this gearbox (like you attached). There are lubricating openings that inject the right amount of lubricant into the respective bearings/gears at each point. Do you think near that opening pipe if we install the sensor, we can get the information of that concern gear mechanism?

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