Re: Maximum Permissible Troughing Angle
Flaring the skirt board so that the clearance to the belt is greater at the discharge than at the inlet is standard practice in good chute design to prevent material from being trapped at the skirt. You don't need much - 10 to 12 mm over the length of the skirt would be good. I would start with that modification before going through the expense of changing out the idlers with higher trough angle.
Increasing the trough angle would not help material being trapped. ■
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.
Re: Maximum Permissible Troughing Angle
Reply by Lyle Brown:
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There may be a bit more to it than this, though if you are solely concerned with trough ability the belt supplier can provide guidance or refer standards (such as AS1334.4 etc).
http://www.apexfenner.com.au/pdf/ConveyorHandbook.pdf
http://infostore.saiglobal.com/store...oductID=224134
Regards,
Lyle
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Re: Maximum Permissible Troughing Angle
Belt feeders are only rarely up to the job. Clients' apply pressure for reduced CAPEX and then naturally whine when the equipment demanda a lot of attention. Whomsoever promised you an 8 year life for a short belt is presumably now well disappeared along with the cheque. Even 1-2 years is very good life in your application since you are probably handling a lot of limestone.
As Gary says, flaring slightly will help but there will always be some lumps getting trapped and you have to live with that. Changing the trough angle will just cost a bit of money and confuse the design.
There is more to it than this. there was at the procurement stage and it hasn't gone away yet. ■
Maximum Permissible Troughing Angle Of A 2400mm Belt Width Belt…
Dear Sir,
Thanks for your reply. This belt feeder is our existing one. Our main cargo is coal. In a month we are only handling two lime stone vessels. We have to keep our main cargo as the prime business.
So we want to have some modification in the existing belt feeder which will allow both coal and lime stone in a techno-profitable way. In this course we assume that the troughing angle might be helpful in this regard as this belt feeder receives material directly from the hopper. Our thought is by increasing the troughing angle the tendency of lump will be towards center of belt feeder during discharge from grab.
In normal conveyor, the troughing angle is 35 degree. In this belt feeder the troughing angle is 10 degree. Now the query is how much we can increase the troughing angle of this belt feeder of 2400mm belt width so that both the cargo can be handled in a techno-profitable way.
Best Regards
Rohit Kumar Swain
The Dhamra Port Company Limited ■
Simplicity That Worx In Background
Dear Sir,
pls. consider, as collegues stated, that there's a deeper technical background to be sounded. Pls. consider, that in significantly reducing the projected belt area by "folding up the edges", you
a) concentrate the impact on a smaller area (forces / impact distribution)
b) need a higher bulk column in order to achieve throughput
... and so on!
You require a full investigation into current state + feasible prospects --> that needs expertise. I think no simple answer will arrive just like that and you perhaps could consider giving the job to some professional with a standard & a record of nondisappearing.
As if not said: If there' s ONE feeder, i'd take care as if it is the only one ;-) and only listen to professional advice under contract.
Regards
R. ■
Re: Maximum Permissible Troughing Angle
Originally Posted by rohit kumar swain
Dear All,
In our Port, we are having Ship Unloaders for import of Coal and Lime stone. The Ship Unloaders are equipped with belt feeder just below the hopper which feeds the cargo to the succeeding conveyor. During coal conveying, the feeder is working very well. But during lime stone conveying through the same feeder, we are facing a lot of problem like belt surface damage, belt deep cut at the edges of skirt. In this way the belt life reduces to 1-2 years only instead of 8-10 years.
...............................
Best Regards
Rohit Kumar Swain
The Dhamra Port Company Limited
Dear Mr.Rohit Kumar Swain,
If you have belt feeders, which could give 8-10 years life, you can get clues from those conveyors, to increase the life of your problematic conveyors which give only 1-2 years. Please post the differences.
Thanks a lot & Many regards, ■
Belt Feeders
Belt feeders have a totally different function to belt conveyors, they are much more sensitive to the physical properties of the bulk material being handled and the feed hopper/loading chute is an integral feature of the design that affects their performance. Like many items of solids handling plant, they are sensitive to fine points of design, so it is not possible to assess the best way forward without detailed drawings of the equipment. There are various possible causes of belt surface and edge damage, such as impact loading, high shear loads, skirt trapping. If drawings of the equipment and details of the limestone were provided, it would offer a better opportunity to evaluate the problem. ■
Maximum Permissible Troughing Angle
maximum permissible troughing angle for belt feeder of 2400mm belt width
Dear All,
In our Port, we are having Ship Unloaders for import of Coal and Lime stone. The Ship Unloaders are equipped with belt feeder just below the hopper which feeds the cargo to the succeeding conveyor. During coal conveying, the feeder is working very well. But during lime stone conveying through the same feeder, we are facing a lot of problem like belt surface damage, belt deep cut at the edges of skirt. In this way the belt life reduces to 1-2 years only instead of 8-10 years.
What we observe, due to trapping of lime stone particles as well as small lumps in between the skirt and belt, the surface of the belt is damaging by deep cuts. On brainstorming, we have some options like flaring of skirt board with little taper, increased troughing angle of belt feeder etc.
The existing belt feeder is with 10 degree troughing angle. We want to confirm that what should be the maximum permissible troughing angle for this belt feeder of 2400mm belt width.
Best Regards
Rohit Kumar Swain
The Dhamra Port Company Limited ■