Re: Angle Of Repose Of Drag Chain Conveyor
When considering trough chain conveyors two areas must be understood by the conveyor designer,
1) the properties of the bulk material to be conveyed, of which angle of repose is just one
2) the operational characteristics of the particular design of 'trough chain conveyor' that is being considered for the application.
It's always best to test representative sample of the material to be handled to establish it's properties. But having the material properties alone will not necessarily enable you to design a trough chain conveyor unless you have the experience of designing the conveyors and knowing their characteristics.
When it comes to elevating, en-masse elevators have been use for 70 years and their use over the years has demonstrated that close clearance plate flights are not necessary, skeleton flights with clearance to the casing will happily elevate material vertically.
As with so much in bulk materials handling knowledge resides with machine manufacturers, if they didn't understand what they were doing they'd be out of business. Equally, they tend to keep hard won knowledge to themselves. ■
He Knows You Know - Hilda Baker
Manufacturers of Stamler reclaimers, MMD stage loaders and the like use a maximum angle of 30 degrees which is less the the angle of repose of the materials they handle. I have never heard of coal not moving under that inclination with those machines which is why, as previously stated, those manufacturers are still in business.
Why do you youngsters not just specify a figure in the equipment enquiry, send the enquiry and see what turns up?
I think you are getting into deep clag if you talk about vertical chain flights etc. If you split the trough, (What do you mean by trough anyway?) and maintain minumum clearances then there wasn't mush point in splitting the trough in the first place, was there? ■
Re: Angle Of Repose Of Drag Chain Conveyor
Dear Mr. Designer,
Thank you very much for your reply, lets split the topic into two
1. Inclined Drag chain conveyor
2. Vertical En Masse Elevator.
1. First of all i would Like to Know that how one can decide for perticular material say cement of bulk density 0.9 to 1 tone per meter cube. can be conveyed at what maximum inclination lets put some values as per Mr.louispanjang Request.
Material Handled :- Cement,
Capacity:- 50 TPH,
Bulk density :- 1 T/m^3,
Shaft C-C 35 m,
Inclination :- 0 degrees (but if there some inclination required whats maximum Possible)
As per above specification i have calculated following confrigation of conveyor for Horizontal Profile of Trough chain conveyor.
Conveyor Width : - 450 mm, Flight Width of 400 mm, Fliglt Hight of 75 mm,
no of chain strand : 1,
Chain size and type 142 mm pitch forged ;link chain of 300 kN breaking load,
Speed of conveyor 0.2 m/sec.
Material bed hight of aprox 200 mm
please suggest what will be maximum inclination i can use for same confrigration of conveyor
and your recomdation as per above application.
2. vertical En masse conveyor skelton flight you mean is flight with double U flight of Square bar ■
Re: Angle Of Repose Of Drag Chain Conveyor
Just a couple of points -
Chain elevators with solid plates that occupy the full cross section of the elevating trough section can elevate material vertically.
What really matters in regard to the material being handled are the properties when it is inside the machine which may not be the same as when tested in a laboratory.
En-masse elevators may have a variety of flight styles.
Regarding the machine you are designing you haven't specified the te/hr you are designing for (or m3/hr), I would infer from the data provided that you are actually designing and en-masse conveyor. I might suggest a conservative value for the inclination of 5 degrees. Might be more if the cement is 'dead' and has lost any entrained air that can make cement 'fluid'.
But be cautious, it's not always wise to believe everything see on the web or read in a book. ■
Re: Angle Of Repose Of Drag Chain Conveyor
yes i have forgoted the value for capacity but have edited the value its it is 50 tone per hour. ■
Re: Angle Of Repose Of Drag Chain Conveyor
@ 50 te/hr you are designing an en-masse conveyor 
■
Steep Angle Conveying - Cement 50 Tph
for 50 TPH - Why are you not using a vertical screw conveyor or bucket elevator for vertical movement? ■
Re: Angle Of Repose Of Drag Chain Conveyor
Originally Posted by Vinayak
Because he needs to move it horizontally not just vertically. Why use two machines when you can use just one. ■
Re: Angle Of Repose Of Drag Chain Conveyor
Originally Posted by designerYes, Sir
I want to know incase if above mention same straight profile or ascending profile (as per VDI 2320 for drag chain conveyor ) is used for same task what is the maximum inclination i can use.
Thanks in advance. ■
Re: Angle Of Repose Of Drag Chain Conveyor
VDI 2320
Never heard of it. 
(Well not suprising really, it's German and I'm not 
)
Post the relevant pages so we can look at them. ■
Re: Angle Of Repose Of Drag Chain Conveyor
Dear Shri Panchal,
It seems you are asking the influence of inclination on the capacity of drag chain conveyor (drag flight conveyor). For the inclination upto surcharge angle, the filling is considered parallel to the trough bottom. For inclination more than the surcharge angle, a surcharge angle line is drawn from the top of the flight, and it will intersect either to the flight ahead or to the bottom of the trough. The area contained between the flight, surcharge line, trough (or trough and the flight ahead) signifies the filling of the material being conveyed. Possibly this is the calculation procedure for drag chain conveyor. As far as cleated belt conveyor is concerned, I am sure about it.
Subsequently suitable fill factor is applied according to the evenness of the feeding at the feed point.
Regards,
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.
Pune, India.
Tel.: 0091 (0)20 25871916
Email: parimul@pn2.vsnl.net.in ■
Angle of Repose of Drag Chain Conveyor
Importance of Angle of repose and angle of incliantion of drag chain conveyor
Dear All,
Do you have any information about relation ship between angle of Repose of bulk goods say cement and angle of inclination maximum we can use for transporting it by a Trough chain conveyor.
as per my information its also posible to us Trough chain conveyor upto 90 degrees by spliting the trough in to two halfs and keeping mimium gap between bottom, side and top wall and drag flight.
any information in this regards would be helpfull
Thanks in Advance,
Panchal ■