Chain Conveyor Sprockets
Originally Posted by mohandes
Is there any standard for the profile of sprockets of chain conveyor?
I have seen below profiles in catalogs however they have not referred to any standard!
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Greetings Masoomeh Mohandes, as-salaam 'alaykum
I hope your first day of Ramadan is going well.
The chain conveyor sprocket has to exactly follow and fit/mate with the SAE measurements for the chain conveyor link that fits it. ■
Sprocket Profile
Salam Leon,
Thanks 
What do you mean by the "SAE measurements for the chain conveyor link"?
Of course the sprocket should be matched with the chain link pitch, however we need another dimensions for the sprocket such as outer diameter, inner diameter,...
I search for a standard or document which gives all dimensions for the profile of sprocket specifically for chain conveyors. ■
Re: Chain Conveyor Sprocket
Originally Posted by mohandesThanks
What do you mean by the "SAE measurements for the chain conveyor link"?
Of course the sprocket should be matched with the chain link pitch, however we need another dimensions for the sprocket such as outer diameter, inner diameter,...
I search for a standard or document which gives all dimensions for the profile of sprocket specifically for chain conveyors.
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Masoomeh,
The "Society for Automotive Engineers" for one source on international standards for sizing dr4ive and driven components of all types and TSURUBI chain is another-I think that is the one you are looking for as they have been making drag conveyor chains for almost a half century or more. ■
Re: Chain Conveyor Sprocket
Dear Leon,
SAE: I couldn't find any standard for sprocket.
TSURUBI chain: are you sure about dictation? Google couldn't find it! ■
More Answers Than Questions..
The more you find out the less you know.....There seem to be more sprocket profiles than there are chain manufacturers and confusion abounds. Over and above the ratio considerations is the need for hunting and chord effect. These might, but should not, interfere with the chains ability to correctly exit the sprocket. Even if the exit clearance is adequate there is often a need to introduce a plucker so that departing chain is forced from the sprocket if the link seizes. I have seen toothless sprockets in mining applications and they almost worked very well. I don't know of any reliable or consistent standard although many chain manufacturers offer sprockets and design advice. You are at the mercy of the chain makers: not least because their products are some of the highest wearing items encountered. Ask any motorcyclist on that score. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Chain Conveyor Sprocket
Pictures I have attached to my first post can be found in many catalogs, so it seems it should have standard. isn't it? ■
To Look Is To Start, To Ask Is To Find
Dear Mrs. Mohandes,
ad 1) TSUBAKI (chains etc.) is a really good address. Then IWIS or RUD may chip in a bit too.
ad 2) Yes, there's standards, e. g. ISO 606, however it is adviseable to follow Leon's advice and to approach a renowned supplier! There's lots of different chains in the market which each will require their specific sprocket, and then chain drives looking simple enough are a paradise error if not for experience and know-how, down to the small but deciding details ... to get a smooth running chain drive, talk to people and have them get the whole picture.
Kind Regards
R. ■
Re: Chain Conveyor Sprocket
Dear Roland,
Thanks for your attention.
Although there are many standards and documents for chains of transmission systems, I have not found a standard for sprockets of chain conveyors.
Chain conveyors which works with forged link chains as attached file, has different profile for sprockets.
Meanwhile I should say that we have a chain failure in a chain conveyor and I would like to find a reference to check if the sprocket can be the root cause of failure or not.
Attachments
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To Go On
Dear Mrs. Mohandes,
if anything, standards touch the issue of the sprocket - to - chain profile, the further execution as to hub, transmission element and so on are usually designed to fit.
I doubt whether such standard exist, but perhaps someone else chips in sthg.
In your case, the chain seems to be a trough conveyor chain, perhaps acc. DIN 8165 or 8167. Could you pls. find out the OEM? The OEM might on being approached be willing to assist! (Chain replacement etc. ;-)
As to the failure, one could proceed from common engineering assumptions (design of the conveyor) considering:
a) setup changes which have occured lately (replacements, take-up done)
b) wear / twear marks on chain / sprocket, specific outlook of the failure (broken link / other)
c) observations of the operating personnel
d) operational events (overloads, alien objects getting into the chain drive / flight)
Regards
R. ■
Pluck It & See
As shown in the photo the exigent link is carried into the PCD beyond horizontal. The centre rib of the link is/can often be grabbed by the inner side faces of the sprocket teeth and this improves the chance of failure. Fact is that your top track is acting as a poor plucker. Raising the track is one way to improve separation. Neither the chain nor
sprocket are guilty: only the track location. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Drag Chain And Drag Chain Sprockets
Originally Posted by mohandesSAE: I couldn't find any standard for sprocket.
TSURUBI chain: are you sure about dictation? Google couldn't find it!
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My apologies Masoomeh, here is the correct link.
It is the Tsubakimoto Chain Group www.tsubakimoto.com ■
Going On
Dear Mrs. Mohandes,
even though you received some input based on the photo, I for one would be very glad to receive some more substantial input, pls. refer my post of yesterday.
Then, additionally, I'd like to put forward some comments:
- Is the assumption of the direction of rotation and of the primary areas of contact sprocket to chain correct? Are these areas equally distributed around the wwrap angle?
- Are the blades pointing backwards (in rel. to direction of movement) already in delivery condition or only after operation?
- How / what is the tensioning cycle, and how the tensioning device is looking like?
Thank you in advance for any details you might be inclined to share,
Regards
R. ■
Re: Chain Conveyor Sprocket
Dears,
Please be informed that the photo I have attached to my previous email belongs to a catalog,
and I tried only to show what I mean about chain conveyor and its sprocket. ■
Slide On ... To Which Goal?
Dear Mrs. mohandes,
I / we understood your requirement as to input concerning a specific failure of one of your technical systems.
If this your request is reduced to the question whether a standard for sprockets exists or not, the goal of this thread may be considered achieved or rather trailing off & out.
If you are interested in specific input to you I'm sure you will be considering to provide specific input to us. The different comments ( & I think all of them) based on the photo are of a general nature and may in all probability be applicable to your chain conveyor too.
Regards
R. ■
Re: Chain Conveyor Sprocket
I wouldn't have put that photo in any catalog of mine. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Chain conveyor sprocket
Dears,
Is there any standard for the profile of sprockets of chain conveyor?
I have seen below profiles in catalogs however they have not referred to any standard!
Attachments
reversible pattern (PNG)
standard asymmetric pattern (PNG)
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