Metalfab PLBB Posibin

The Metalfab PLBB Posibin is a low vibration transmission (LVT) bin activator that utilizes threaded rod isolators as hanger arms to reduce vibration


TYPE: Silo/Hopper Discharge Vibration Aeration Equipment

MODEL: Metalfab PLBB Posbin

The Metalfab PLBB Posibin is a low vibration transmission (LVT) bin activator.  The model PLBB is based on the same principles as our standard Posibin bin activator, and uses threaded rod isolators to reduce vibration.

Ideal for sensitive scaling equipment and scaling systems, or for use in loss in weight gravimetric feeders, the PLBB is a smaller sized static cylindrical bin fitted with an LVT bin activator.

The low vibration motorized unit provides continuous movement of product within the bin.  A primary conical baffle, mounted within the LVT bin activator, moves recumbently with the unit to keep the contents in continuous motion aiding steady flow of material and eliminating potential flow arrestment.

A secondary adjustable baffle, located at the final outlet, moves at a different range to prevent jamming and compaction in the exit area.

How Do Bin Activators Work?

Positive discharge or First In First Out (FIFO) flow of a silo is accomplished by the internal cone-shaped baffle which is rigidly attached to the body of the bin activator.

This vibrating cone replaces a major portion of the standard fixed cone. The bin activator unit moves horizontally by the unbalanced weights of an attached vibrator. The cone baffle relieves the weight of the material from the lower section of the bin activator and acts like a wedge as it moves beneath the material and pushes it in all areas adjacent to the cone's surfaces. This powerful force is also transmitted to the material in the upper portion of the bin as the motion is carried from particle to particle. Product discharges around the periphery of the baffle toward the outlet of the Metalfab bin activator.


Used in bulk solids material handling systems, Bin Activators, also known as Live Bottom Bins, Shaker Bins, or Vibrating Silo Bottoms, are used to create a flow of dry bulk solids from vertical storage bins. The Live Bottom will overcome sporadic or irregular discharge problems created by arching, bridging, and ratholing. The typical geometry on a standard 4:1 vertical round bin is a live bottom that is half the diameter of the silo.

Products Handled

  • Alumina
  • Carbon Black
  • Clay
  • Diatomaceous Earth
  • Magnesium Oxide
  • Salt
  • Soda Ash
  • Titanium Dioxide
  • Zinc Oxide
  • Semolina
  • Calcium Carbonate
  • Lime
  • Limestone
  • Flour
  • Sugar
  • Starch
  • Activated Carbon
  • 3-A Dairy


  • Five models are available
  • Nearly silent operation
  • Diameters: five models accommodate 20" - 30"
  • Capacity: 3 to 15 cu. ft.
  • Bulk Density: to 50 lbs./cu. ft.
  • Construction: Carbon steel, 304 or 316 stainless steel, special coatings
  • Uses the low vibration transmission (LVT) bin activator.  Ideal for use with sensitive scaling systems and equipment or for loss in gravimetric feeding


  • Other Metalfab upstream/downstream feeders, bulk bag unloaders and hoppers


Posibin 5 to 15 cu. ft. Capacity
Model Capacity BD OD A B C D E F HP
PLBB 20-3 3FT3 20 23 7 1/2 22 41 23 1/2 26 1/2 16 7/8 1/2
PLBB 20-5 5FT3 20 23 19 1/2 34 53 23 1/2 26 1/2 16 7/8 1/2
PLBB 24-8 8FT3 24 28 19 34 1/2 53 28 31 1/2 19 3/4  1/2
PLBB 28-10 10FT3 28 32 16 32 51 32 35 1/2 21 3/4 1/2
PLBB 30-15 15FT3 30 34 24 1/2 41 60 34 37 1/2 22 3/4  1/2

For more information on a MetalFab PLBB Posbin and how it can improve your silo discharge processes, please contact a Thomas Conveyor & Equipment Pneumatic Engineer or call us today! 

QUESTIONS? CALL 844-220-0086

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