Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Low shaft, which I assume you are referring to low speed couplings?
There are "features" and "benefits" to each type.
Considerations may include: cost, life, maintenance, allowable misalignment, capacity (strength), noise and is torsional displacement acceptable etc.
You local copy of "machine type handbook" etc provides an introduction to common types.
You may like to consult a supplier for their recommendations.
The couplings you appear to have referenced, would appear to not have any moment capacity (and or minimal shear capacity). You need to ensure this is your intention.
Regards,
Lyle ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
It is often necessary to tune the coupling to reduce torsional oscillations. Rubber inserts used to be easily interchanged to facilitiate damping. Perhaps modern spring couplings can provide the same damping.
As Lyle Brown observes this damping is not as important as torque capacity at low speeds. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Well noted! Dampening is another feature, that I didnt think of earlier. ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Mostly I have seen gear couplings applied between the output shaft of the gear reducer and the pulley shaft.
Steel grid & buffer types seem more common for the motor to reducer connection ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
I was implying my opinion that “commonly” "larger" drives are mounted to the pulley via a rigid low speed coupling of some description.
Helical type reducers or bevel helical units with “intermediate” shafts don’t lend themselves to this and I assume they could be an exception with the reducer / pulley connection requiring some form of tolerance to "misalignment".
Regards,
Lyle ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Dear wgbtransmission,
The widely used flexible couplings are pin and rubber bush type flexible couplings, geared type flexible couplings, grid type flexible couplings, tyre type flexible couplings and others. Each of these couplings has its own characteristics and one should look in to its behaviour on following points :
- Permissible radial misalignment
- Permissible angular misalignment
- Damping effect to torsional vibrations
- Vibrations created due to imbalance nature during start-up
- Noise level
- Economy, easy availability
- Restriction for weight / mass, if it is for mobile machine etc.
- Dimensional constraint for installations etc.
The last but not the least, the users preference. Many times users have preferred types, due to their liking or existing types in the plant.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25871916 ■
Coupling On Low Speed Shaft
I have used Gear Couplings on low speed shaft for 5 km long curved conv and 2.5 km long pipe conv.No probs.
Fluid , Spring grid couplings are used on high speed shaft. ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Hello all..
Here in South Africa, steelflex, gear and pin/bush couplings went out of fashion about 25 years ago. It's all shaft mounted drives via rigid steel low-speed couplings to avoid deflection and alignment problems.
I am even busy right now changing a mine's original (1983 vintage) drives from base mounted to shaft mounted.
Regards
LSL Tekpro ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Interesting technical discussion to watch even though the thread is decades old. I want to ask something, is there a coupling supplier that you can recommend to me? ■
Re: Flexible Couplings For Large Belt Conveyor's Low Shafts
Originally Posted by ashantydddhasandd
Not yours when you go around posting sneaky links to your site. That method of free advertising is frowned upon very heavily on this site. You want to advertise then contact the site owners they will be happy to set you up with an account. ■
Gary Blenkhorn
President - Bulk Handlng Technology Inc.
Email: garyblenkhorn@gmail.com
Linkedin Profile: http://www.linkedin.com/in/gary-blenkhorn-6286954b
Offering Conveyor Design Services, Conveyor Transfer Design Services and SolidWorks Design Services for equipment layouts.
Flexible couplings for large belt conveyor's low shafts
At present,two types flexible coupings,i.e. with eleastic buffers or steel springs, are applied at low shafts for large belt conveyors. But which type is more suitable for this application. Very appreciated to hear your comments.
Thanks. wgbtransmission ■