The document discusses belt conveyors and bucket elevators. It provides formulas to calculate the mass of various components per unit length of belt conveyors, including the belt, idlers, and solids. It lists typical density values and spacing for idlers. It also lists assumed chain speed and bucket spacing ranges for bucket elevators. The document concludes by stating it will solve lecture questions and problems from the sheet.

1. Common Mechanical Operation
Section 3
Eng. Kareem H. Mokhtar

2. Belt conveyor
F= 0.02 – 0.04
T3 = 1.1 T2
So we need to calculate mb (mass of belt), midlers (mass of idlers), and m(mass of solid)
Per unit length

3. Belt conveyor
Mb (mass of belt per unit length) = B * x * density of belt
1000 - 1500 kg/m3
(4 mm)
(2 mm)

4. Belt conveyor
Midlers (mass of idlers)
7800 kg/m3
Mass of idler per unit length =
𝑚𝑎𝑠𝑠 𝑜𝑓 𝑖𝑑𝑙𝑒𝑟 ∗ 𝑁𝑜.𝑜𝑓 𝑖𝑑𝑙𝑒𝑟
𝐿𝑒𝑛𝑔𝑡ℎ
Idlers spacing if 2000 kg/m3  1100 mm to 1500 mm
if heavier  1000, 1300 mm
Length / spacing

5. Belt conveyor
Mass of solids per unit length = mass flow rate / velocity
Velocity  assume 1 m/s if not stated

6. Bucket Elevator
Assume
Chain speed --> 0.2 – 1 m/s (usually 0.5m/s)
Spacing  300 mm to 450 mm

7. Let us solve
• A) Lecture questions
• B) The sheet

8. Sheet 3