
The Vibra Screw Continuous Loss In Weight Feeder provides unparalleled versatility in handling a broad range of feeding requirements. Feed rate from 20 pounds to 24,000 pounds per hour can be accomplished with accuracies of plus or minus 1/4-1% on a minute-to-minute basis at 2 sigma. Control of the feeder is through a microprocessor-based controller equipped with one million counts of resolution and exclusive disturbance elimination technology. The continuous weighing feeding devices can include pan or tube feeders, screw feeders and belt feeders. Vibra Screw is the only manufacturer to offer a controlled vibration feeder design for weigh feeding, This means minimal loss of accuracy during the volumetric refill cycle and unprecedented accuracy in the gravimetric mode.
How It Works
How does Loss In Weight Feeding Work?
A Loss In Weight feeding system includes a supply hopper or tank, a metering feeder or pump, a supporting scale system, and a microprocessor controller. The system electronically balances tare weight so the controller senses only the weight of the material in the supply hopper.
At time zero, the hopper is full (high weight), and the operator enters the set point or desired feed rate into the controller.
As time and discharge advance, the actual sensed “loss in weight” follows the decreasing scheduled weight ramp whose slope is a direct representation of the desired weight of delivered material per unit of time (set point). The controller makes frequent comparisons of sensed vs. desired rate and alters the feeder’s output, keeping it at the set point.
Once the sensed weight reaches the hopper refill level (low weight), the controller locks the feed system into volumetric control. The hopper is recharged, and the loss in weight cycle repeats.
The controller rate disturbance mode protects against any outside weight disturbance that might cause an upset and provides the unique ability to manually load the hopper at any time without disturbing the feed process.
Click the Play Button in the center of the video to view.
Schematics
Loss-In-Weight Feeders | |||
18026-SD | 1 1/2″ AccuFeeder, Loss-In-Weight 1.5-500-1.5 | ||
LIW-A-17845 | 3/4″ Mini Loss-In-Weight feeder | ||
LIW-A-17962 | 1-4″ Loss-In-Weight feeder | ||
LIW-17965 | 3″ Loss-In-Weight with 15 cu.ft. hopper & load cells | ||
LIW-17964A | 4″ Loss-In-Weight with 50 cu.ft. hopper & load cells | ||
LIW-17963A | 6″ Loss-In-Weight with 150 cu.ft. hopper & load cells | ||
S120 | Model 2160 continuous Loss-In-Weight controller | ||
S122 | Regenerative SCR motor controller | ||
S148 | Model 920I Loss-In-Weight / Gain-In-Weight Batch Controller |
EQUIPMENT TEST VIDEO
Modified Versi Feeder,
Continuous Loss-In-Weight System
Case Histories
Loss-In-Weight
C-264 Sulfur Dioxide, LIW
C-269 Lime,LIW
Product News
Accurately Weigh Grams Per Hour to Tons per Minute
With a broad product line that addresses everything from main silo discharge to micro-ingredient feeding, Vibra Screw offers a continuous or batching weighing solution for every dry bulk feeding problem.Accurate weighing of dry bulk solids requires reliable and consistent flow of material from storage into the feed mechanism itself. Vibra Screw’s unique use of controlled […]
Not Your Average Loss-In-Weight System
TOTOWA, NJ — One of the things that sets us apart from our competitors is the ability to supply a complete system for accurate, high rate loss in weight feeding of the most difficult materials. Cement and kiln dust have a tendency to pack solidly or aerate, and flush right through the system. This is […]
Vibra Screw Loss-In-Weight Feeders Combine Versatility and Accuracy with Unique Control Package
TOTOWA, NJ — Vibra Screw, Inc., a leader in solids processing and solids handling solutions, offers a versatile line of loss-in-weight batch feeders that provide accuracies to ± 1/4% to 1/2% with batches from ounces to tons, feeding materials from liquids and fine powders to fibrous or flaky materials. Control of batch size and feed […]
Loss-In-Weight System Controls Lime Dispersion In Snack Food Production
Vibra Screw, Inc., a leading manufacturer of equipment and systems for precision processing of dry bulk materials, is offering a new Case History No. C-269 describing how a major snack food manufacturer uses Loss-in-Weight Feeders to control line dispersion in production of corn-based products.The manufacturer had been adding a small but precise amount of lime […]