It depends on the design optimization process (idler selection and spacing, lubrication, belt speed, loading, ...... ), type of belt tension member fabric construction and type of bottom rubber "low energy loss" compound used.

You say nothing about your design and design criteria including:

a) tonnage - peak and nominal

b) bulk density wet and dry - per tonnage

c) maximum lumps size

d) idler roll diameter

e) idler spacing

f) idler bearings

g) idler trough angle

h) drive system and distribution

i) type of take-up

j) temperature operating range

k) elevations negotiated

l) ......... additionals

You can split the take-up travel into a fixed section for permanent stretch, spares & splice repair installed in loop, vs. gravity travel in another take-up station for dynamic motios & thermal expansion variations. This should split the motion into two more or less equal lengths. This is a common practice we use for large and long low modulus conveyors. ■

2000 m length is easy for most fabric belt suppliers up to 2000 t/h. Steel cord belts do not need to be used in this size range. Steel cord belts will consume less power. A EP-800 N/mm belt will do fine.

Since you did not nominate capacity and sizes, I made a brief review. ■

Hello Mattsec,

The take-up travel will depend on your tension in the belt due to your design and elastic modulus of your belt. Mr. Nordel listed most of the factor that effect the tension. You can adjust your design to reduce the tension.

Besides, you may use sth. like this arrangemt or sth. more creative.

href="https://forum.bulk-online.com/attachment.php?attachmentid=29261&d=1313577202" title="Name: Untitled.bmpViews: 271Size: 83.3 KB">Untitled.bmp ■

Expensive? No. The tail pulley can already act as one or both. You just need to install a track system to maintain tail pulley alignment for the range of movement.

Your conveyor design is less than ideal. Not offering an alternative, I still comment on size of lump being way too large for the km transport. You only need the exessive width because of the hugh lump.

The 45 degree trough is also not in character. Try 35 degree. Also 178 mm diameter idlers are not needed. There is insufficient roller pressure to consider their benefits. A 3 m carry x 6 m return idler spacing would be more like a modern design.

Wound Rotor motor? Why not a simple primary voltage starter or simple fixed level fluid coupling when you are considering $$$$? ■

A 900 mm wide belt is more than ample. However, we do not design within this forum. ■