 |
       
|
 |
The Non-Consolidating "MOVING HOLE" Feeder
The patented Moving Hole feeder essentially consists of slots which traverse back and forth, without any friction between the stored material and the feeder deck. As the deck is traversed back and forth, the belts on the deck sections are held stationary relative to the stored material, thus creating frictionless "moving holes". Lack of friction between the stored material and the feeder avoids compaction of the material. Unlike commonly used feeders that must shear material from a head load and push it forward, the "Moving Hole" feeder relies only on gravity. The slots traverse the entire hopper outlet area, resulting in a fully "effective" discharge irrespective of the length of the hopper. The feeder provides reliable flow of even very difficult flowing materials without "hang-ups". 
Drive and Controls Normally a hydraulic power unit (HPU) is used to drive the feeder, although, air can also be used. With the hydraulic system, a directional proportional flow control valve regulates the flow and direction of the fluid to the cylinders, and, hence, the discharge rate of the material. Metering is done under the moving slots - volumetric discharge is proportional to the speed which can be remotely controlled. Storage ConfigurationsThe feeder system is applicable for a range of bin configurations:
Tall Bins and Silos Tall bins and silos provide economical storage of a large volume of material with minimum floor space. Mass flow requires that the hopper walls be sufficiently steep and smooth such that the stored material slides down the sloping walls instead of funneling ("rat-holing") through the center core of the bin. A first-in-first-out flow pattern results with Kamengo's design. Structural design of the bin is done using Kamengo"s bin wall pressure program, which calculates wall pressures in different areas of the bin. The bin wall thickness and the sizes and locations of the stiffeners are determined to arrive at an economical design. "Formed" stiffeners instead of standard structural members used typically requires 40% less steel. 
Reclaiming via Long Feeders With the "Moving Hole" feeder system, the hopper and feeder can be made 30 m+ long, and still discharge material effectively and uniformly along the full length. This feature makes our system well suited to reclaiming from under large storage piles, domes and bulk cargo ships and barges. For domes and ships, "funnel flow" hopper design is used to maximize storage capacity and at the same time, have a self-emptying hopper without manual intervention. 
Open Storage Piles A long feeder under an open storage pile can provide significant amount of storage. By exceeding the "piping" dimension for the stored material, a shallow "draw-down" angle of material in the pile is obtained. Feeder length of over 30 m (100') can be used for significant amount of "live" storage. Also, several feeders can be installed end to end, as is done on a ship, to cover a long length of pile. 
Bulk Storage Domes "Effective" discharge from a long opening makes the "Moving Hole" feeder well suited to reclaiming from under a storage dome. The dome can have a flat floor or sloping walls as illustrated, depending on the "live" storage desired, and material flow characteristics. 
Home | Our Approach | Products & Services |
Moving Hole Feeder | Applications
|
|
 |
 |
 |
© 2001 Kamengo Technology Inc. |
 |
 |