FUNCTIONAL DESIGN OF SCREWS, BELTS and ROTARY FEEDERS

A feeder is essential for modulating the flow rate of bulk solids from silos, bins, and hoppers.

Jenike & Johanson engineers have the knowledge and experience to assist you. A feeder that has been “functionally” engineered means that it has been designed based on the flow characteristics of the bulk material to be handled and the requirements for the application (e.g., flow rate, space constraints, wear effects, pinching…etc.).

Our functional designs for screws, belts / aprons, rotary valves / airlocks include:

• General configuration – overall geometry with critical dimensions
• Feeder inlet size and shape – designed to prevent bridging and meet flow rate
• Feed rate (volumetric or gravimetric) and speed
• Power requirements
• Interface design with silo/hopper storage system
• Upstream hopper, valve, slide or pin gate integration
• Downstream chute integration

The feeder is an integral part of a storage system because it will have a major impact on the flow pattern in the storage vessel - it should not treated as a stand-alone piece of equipment. The feeder should be integrated into the storage system early in the design process.

Mass Flow Belt Feeder	Mass Flow Belt Feeder	Flow-of-Solids™ Pumps
Mass Flow Screw Feeder	2 ft x 12 ft Slidegate Over Mass Flow Screw Feeder	Stainless Steel Mass Flow Screws