Re: Article About Dimensioning Bin Openings Having A Horizontal…
I am still doing the same research, but i solved most of the problems i encountered.
A very nice article to get information about dimensioning the hopper is :
An overview of feeder design focusing on belt and apron feeders
(bulk solids handling volume 21, number 1 , january/february 2001)
Mr A.W. Roberts wrote this article and has a big knowledge of this subject. Most of the questions for dimensioning the hopper will most likely be answered in this article. ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
This question arises, due to the fact that i want to "design" the outlet of a mammoth silo for a certain coal in theory. Underneath the flat bottom mammoth silo, an extra hopper needs to be placed, which has a trapeziod outlet shape to assure use of the whole area of this "sub"-hopper. Funnel flow occurs in the mammoth silo and mass flow occurs in the "sub"-hopper. I already calculated the needed outlet at the bottom of the mammoth silo, minimum required material channel diameter and pressures. This knowledge, together with the properties of the material being stored known, i should be able to design a proper outlet/sub-hopper, which transports the material to the belt underneath.
If i am not able to retrieve the article, mentioned earlier in this topic, does some1 know usefull articles on this subject?
thanks in advance
chris ■
Bin Openings
Chris,
you may want to contact:
Chefredakteurin AT Aufbereitungs Technik
Katja Duddek
+49 5241 80-89367
katja.duddek@springer.com
Reinhard H. Wöhlbier ■
Apron Feeders
I'd like to see that too.
There are plenty of articles on design of apron feeders - try CM Ramos - Design of Apron Feeders - Bulk Solids Handling Vol 7 No 6, 1987.
Otherwise try CEMA - Conveyor Equipment Manufacturers Association, or Feeder Equipment Vendors.
On Mammoth Bins try - Bulk Solids Handling - Silos, Hoppers, Bins & Bunkers - Trans Tech Publications A/86 ■
Untitled
Hi john,
tx for mentioning CM Ramos - Design of Apron Feeders - Bulk Solids Handling Vol 7 No 6, 1987 . It indeed is a very usefull article, but doesnt contain the actual designing of the sub hopper 
.
Nontheless I am very sure i can use this article in the near future. ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I found a copy of the article in rademacher's archive.
Unfortunately, its not really about dimensioning a sub hopper for use with an apron feeder. This article has a more in depth review about calculating the resultant force acting on the rupture plane.
John, if you want this article, i might be able to send a fax to you.
Interesting to see is that both articles assume a known geometry of the sub hopper.
My main question:
If a minimum desired outlet diameter for the flat bottom mammoth silo has been calculated (jenike / janssen theory) , which steps must be taken to come to a working trapeziod sub hopper geometry in order to have continuous flow from the main silo to the apron feeder, while having mass flow in the sub hopper?
Maybe somebody knows an article with information about this subject?
I am already aware and familiar with the calculations to determine the hopper angle in order to attain mass flow within the sub hopper. ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I think Mr Mulani covers this subject in his book:
Belt Feeder Design and Hopper Bin Silo
Anyway, try and contact him here: parimul@pn2.vsnl.net.in ■
Rademacher: Gestaltung Von Bunkerausläufen ...
Chris,
Have you check the eLibrary at http://www.bulk-online.com/ELIB/index.php?inc=3
on this Portal?
There is also an article by Fritz Rademacher on Apron Feeders published in "bulk solids handling", 1982.
If you search for "Rademacher", you find 10 articles all published in "bulk solids handling".
Reinhard ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I got all those articles indeed.
These articles contain very usefull information, but do not cover the subject mentioned above 
.
I also contacted Mr mulani btw 
■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
Chris
What happened to Rademachers...he gave a presentation to IE Aust some years back...he gave me a copy of the design loads article which U mention
With the sub hopper design - there are others who have done works on this - some Aussies...try Trans Tech Publications.
I presume that U are looking to determine
min slot width at rear
slot width to lenght ratio - minimum
slot opening angle - plan view
gate height opening
Cheers
James ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
Hi James,
those are indeed the dimensions i want to determine.
Unfortunately, Rademacher's archive does not cover the trans tech articles .
Rademacher himself has some troubles with his health.
At the moment he suffers a very light form of memory loss, i have been told. ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I added an attachment with information about the sub hopper in pdf format.
I want to determine its dimensions, in order to have mass flow in the sub hopper, while transporting the material to the feeder by using some sort of guideline/calculation method. ■
Fax Number
Thanks Chris,
My fax number is on the webpage. My technical German is very poor - I hope I may understand it.
John.Rz
http://www.mets.net.au/ ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I added an attachment with information about the sub hopper in pdf format. ( forgot it the first time )
I want to determine its dimensions, in order to have mass flow in the sub hopper, while transporting the material to the feeder by using some sort of guideline/calculation method.
Attachments
■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
Dear Chris,
I have your e-mail messages, and I would be also responding to you for the same. Meanwhile, following reply had been already prepared and has been put in this forum for your information and also for the benefits of other readers.
As I can understand, you have flat bottom (bottomless) cylindrical silo. At the bottom opening of this silo, you have flange connection to conveying hopper, which will feed to belt feeder. The belt feeder, converging hopper and vertical portion of silo (or hopper) forms a continuous entity for material storage / flow. In this context, I would like to mention as below :
1) Are there ‘flow dead zone’ at junction of “vertical silo cylindrical bottom” and “converging portion of hopper”? Such dead zone may not be permitted when it can result into fire hazard, explosion or objectionable degradation (contamination) of material. For the climate in India (ranging from 4 deg C to 38 deg C) the spontaneous fire in a coal is issue of practical concern and one avoids the dead zone subjected to repetitive impact. I do not have data on this issue for coal behaviour in a very cold climate country.
2) The dead zone as above can be eliminated by cone diameter equal to silo bottom diameter.
3) The dead zones are not objectionable for inert materials like sand, stone, many of the ores, etc.
4) One is to decide vertical pressure in material at interface of vertical portion and converging portion.
5) The vertical pressure as above is input to pressure formula for converging portion. For converging portion, I use DIN formula. This will allow you to calculate material pressure at outlet of converging portion. This outlet pressure is input to belt feeder design, in specific pattern / mode.
6) The converging portion outlet minimum size to be more than minimum to prevent cohesive arch and mechanical arch. If you are using expanding type skirt board, then minimum size will be applicable to hopper outlet towards tail end of belt feeder.
7) The minimum dimension to prevent cohesive arch would need certain input into formula. These input are dependent on pressure value and of course on material characteristics specific to this application. If your material is not uncommon then one may get these data by reference or one has to conduct / organise tests.
8) The interface at hopper and belt feeder demands specific arrangement which is too lengthy to narrate here. Improperly designed interface would result into less optimum performance (I would not like to use harsh word like inferior performance).
9) Finally, the converging portion outlet dimension would be as needed to prevent arching or as needed by belt feeder to achieve capacity (whichever is more of the two).
I think the above information / hints will be useful to you for your project.
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 25882916 ■
Re: Article About Dimensioning Bin Openings Having A Horizontal…
I got a pdf, which contains rademacher's article.
People who are interested can say so ofc, but its to big to post on this forum. ■
Article about dimensioning bin openings having a horizontally positioned belt
Hi,
.
i am a student from the TU Delft in Holland and i am doing some investigation on belt feeders. Atm i am busy with the analysis on dimensioning bin openings having a horizontally positioned belt.
Rademacher published several articles about this topic and i happen to have 1 of them (Reclaim Power and geometry of bin interfaces in belt and apron feeders), since i have acces to Rademacher's archive.
However, in this article, Rademacher refers to a previous made article with in depth analysis of dimensioning bin openings having a horizontally positioned belt. This article contains exactly the information i need atm, since it explains the theory + calculation of the dimensioning of bin openings. However, this article can't be found in Rademachers archive
Any1 at this forum that happens to have this article i am referring to in a pdf format maybe?
Article :
Rademacher : Gestaltung von Bunkerauslaufen fur den austrag mit abzugsbandern , Aufbereitungs-tech , 1978 , no 8 , page 350 - 353
Thanks in advance
kind regards
chris ■