Re: Static Pretension For Belt Feeder
Dear Mr. Ditto,
You have a belt feeder which is reversible in nature and is equipped with screw take-up i.e. functionally it is a system wherein the belt length remains constant during operation (this should not be confused with the periodic take-up adjustment). In such type of system, belt tension diagram area remains constant. So, you have to calculate the belt tension in varied situations and tension diagram in each of these cases. Finally one has to make adjustment considering the maximum area of tension diagram. It is not possible to further elaborate the detailed design procedure or various steps, in the forum.
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: Static Pretension For Belt Feeder
Hello Ditto
We have designed and built many many belt feeders from light duty 500mm wide up to extremely heavy duty 3000mm wide, but none have a drive at each end, because they do not need it.
Although it is a fairly easy calculation to make, I use my own computer programme to calulate the pre-tension which is very high on the big feeders, and achieved using manual hydraulic jack 20 ton) assisted screws.
The secret is that the shorter the feeder's high tension bit, the lower the pre tension.
Belt feeder design is an art that you get over the years, especially the calculation of initial break away forces and running forces, and how to cope with them and design a reliable feeder that is easy to maintain.
It took me about ten years to develop what in my opinion is now the perfect belt feeder.
Regards
LSL Tekpro ■
Re: Static Pretension For Belt Feeder
Further to my earlier reply, I would like to add small information. As you say, you have take-up device and also one drive unit at that location. In such case, you may consider using shaft mounted drive unit, which would suit better in conjunction with take-up device.
Also, if you use only one drive unit at head end instead of two drive units, the only difference that will arise will be that the high tension T1 will also pass through take-up device. Accordingly, it will require somewhat heavier size of take-up device.
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 ■
Static Pretension for Belt Feeder
I am working on a reversible belt feeder. The drive pulleys are located each end (The power is shared by two drive pulleys.) and the fix take-up is used at one of drive pulleys. I don't know how to define the static pretenion for this feeder. Does anyone have any experience in this setup? ■