Milling industry Diamondback Hopper

Milling industry products are among the toughest materials in the world to handle, whether its corn refuse, bran flakes, wheat germ, hominy, sticky midds, or hard and soft wheat flours. All are notorious for their ratholing, arching and high maintenance problems.

Achieving desirable flow rates that take advantage of plant and processing capabilities, or controlling dust that creates safety and cleanup nightmares, are often left to tinkering with vibrators, air pads, fickle valves, and even sledge hammers. Add to that the cost of running vibrating dischargers, air compressors or bin cleaning devices, and it spells E-X-P-E-N-S-I-V-E.

The one-dimensional convergence Diamondback Hopper, designed for the milling industry, can replace a leaking belly-band transition fastened to an over-compacting vibrating hopper using only a solid flanged connection. It easily replaces eight and 12-foot-diameter vibrating hoppers, or adapts to existing circular or rectangular stationary hoppers. When equipped with a sloping extension chute, it's possible to load trucks in seconds with minimal dust, and an optional DBT feeder adapter interface allows direct loading onto a belt or screw conveyor. Adding an air permeation unit (APU) increases load-out rates to as high as 11,000 lbs/min.

Typical retrofit applications
  • Existing conical bins with vibrating hoppers
  • Conical, square or rectangular stationary hoppers
  • Truck load-out bins
  • Transfer bins
  • New construction
  • Stainless steel, corrosion, wear-resistant construction
  • Optional epoxy-coated carbon steel construction
  • Standard 24-inch outlet size for truck loading
  • Optional smaller outlet sizes to fit all applications
  • Standard eight and 12-foot top diameter sizes
  • Customized transitions to square or rectangular bins
  • Sloping outlet chute attachments for high-speed
  • truck loading and dust containment
  • Optional oscillating interior plates for severely caked, high temperature and high moisture midds

We warrant all milling industry Diamondback Hoppers for a period of nine months or longer if we test a material's flow properties.

Milling hopper case history: cereal producer

A California milling company had two 21-foot-diameter silos, each equipped with a large 12-foot vibrated hopper connected to a 21-foot-diameter, 60-degree conical hopper. This hopper created a 10- to 12-foot stable midds rathole that had remained in the bin for months. When the company loaded trucks through the slide gate and chute, the dust from the vibrated hopper's leaky belly band and the top of the open truck was almost unbearable. Obviously, something needed to be done.

The solution consisted of replacing the existing 12-foot-diameter vibrated hopper with a series of three Arch-breaking Diamondback Hoppers equipped with air permeation. The existing gate remained unmodified except for a sloping 24-inch pipe section added under the valve to reduce dusting and to control the midds flow to just above the truck's open top. Material properties testing done prior to hopper recommendations indicated that the midds flow rate could be increased to about six times the existing rate by adding air injection.

Installation required a coordinated effort between the fabricator and the installer, because they needed to complete the work while the other bin was filling and trucks were not running. The most significant installation delay, however, was the time it took to jackhammer the midds out of the bin and clean the existing 60-degree conical hopper. After that, installation went smoothly.

Once in operation, the dust essentially disappeared during truck loading, and when the air permeation unit was activated, trucks could be loaded in about one-quarter of the time. A second identical bin installed speaks singularly for the success of the design and installation.

Contact us at

Diamondback Technology, Inc.
3851 McKay Drive
Langley, WA 98260
(360) 303-7763

Milling Industry Hopper

We have custom-engineered Diamondback Hoppers to meet the specific needs of the milling industry, to increase load out rates and minimize dust. These Diamondbacks retrofit or replace existing vibrating bins and stationary hoppers using standard and custom transitions for all applications.

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