Rulmeca Corporation Video #5
Hopper Feeder Design – Part Two

Part Two of the “Hopper Feeder Design” series explains:

● Arching Theory
● How to Calculate Hopper Drag Load
● Pressure Relief Tips


Mike Gawinski explains that arching theory enables hopper feeder designers to ignore much of the weight contained within a hopper while focusing on material contained within the parabolically shaped “active volume” of material to be removed through the hopper bottom opening.

He explains how a parabolic shape may be conservatively approximated by a rectangular prism and how to convert the weight of material within the prism into a cutting force parallel to the direction of belt travel. He illustrates how to do that with an example, showing how to convert the hopper drag into required drive power.

He demonstrates how to automatically perform these calculations using the Rulmeca hopper feeder drive calculation program, available on the company’s website.




Finally, he shows how pressure relief structures may be added to hopper openings to decrease hopper drag load and required hopper feeder drive power. He illustrates the technique manually and with the company’s hopper feeder drive power calculation program. He demonstrates the effect of converting one hopper opening to two openings and then makes a dramatic comparison with a hopper opening conversion to four openings.

The conclusion of the lesson is that converting one hopper opening into four openings may cut required hopper feeder drive power in half.


RULMECA Corporation Videos
shown on Powder Bulk Videos:

1. RULMECA Corporation:
Introduction to Motorized Pulleys – Video #1

2. RULMECA Corporation:
The Rulmeca Advantage

3. RULMECA Corporation:
How To Calculate Belt Pull and Power – Video #3

4. RULMECA Corporation:
Hopper Feeder Drive Design Part One – Video #4

5. RULMECA Corporation:
Hopper Feeder Drive Design Part Two – Video #5