Metalfab Sanitary Bin Activator

Metalfab Sanitary Bin Activators feature stainless steel construction and other features making them suitable for food processing and other sanitary applications.

TYPE: Silo/Hopper Discharge Vibration Aeration Equipment

MODEL: Metalfab Sanitary Bin Activator

Food Grade Safe Icon

Sanitary bin activators incorporate all of the same features found in Metalfab's standard bin activator models.  Sanitary bin activators showcase a number of added features including various polished finishes, a seamless food grade sleeve and continuous welds, making the sanitary models suitable for food products and other sanitary applications.

A bin activator provides continuous flow of dry bulk materials; it is a vibrating cone attached beneath a silo. Discharge is assisted by the cone/unit vibration and the centifugal force generated by the activator.

Built to withstand the repetitive vibratory motion and forces from the product load above them, Metalfab bin activator offer unique design features including dual baffle design, solid steel suspension arms, an endless beaded flexible sleeve, and unitized vibrator/motor all combine to make this product a leader in bin activators/bin dischargers.

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 rat holing. 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


  • Designed for food and other sanitary applications
  • White BUNA N Seamless Food Grade Sleeve
  • Ground smooth, continuous contact welds
  • 304 or 316 stainless steel construction with a variety of polished finishes
  • Wide range of sizes, 2' to 16' diameter
  • The unique dual baffle design features a primary and suspended secondary baffle that delivers continuous flow of dry materials without plugging, jamming or bridging. 
    The secondary baffle moves at a different range than the bin activator body, which creates a motion in the product at the outlet which, in most cases, eliminates the need to "cycle" the vibrator.
  • Endless beaded flexible sleeve, 7/16" thick with 3-ply reinforcement that will not puncture, slip or leak
  • Solid steel suspension arms are bolted 90° and can each support up to 500,000 lbs. to ensure that the bin activator will always remain attached to the bin and will not move off-center
  • A unitized vibrator and motor combines the vibrator and motor in a single, sealed enclosure with no belts to slip or break. The heavy duty, spherical, roller style bearings are sealed, eliminating the need to remove the unit when making force adjustments.
  • Performance guarantee: Every Metalfab bin activator is guaranteed to perform in accordance with specifications or the purchase price will be refunded


  • 304 or 316 stainless steel
  • Sizes/Diameters: 2', 3', 4', 5', 6'. 7', 8', 10', 12' 14' and 16' (See chart below)


  • Maintenance slide gate
  • Explosion proof
  • Positive or negative pressures
  • Other Metalfab upstream/downstream bin activators, Covey-All™ Conveyors, bulk bag unloaders, Posibins™ and hoppers


DiameterO.D.I.D.A*BNo. of
BA-2 2' 28 1/2 23 1/2 11 22 5/8 4 0.4
BA-3 3' 41 35 1/2 20 5/8 29 3/4 3 1.5
BA-4 4' 54 47 1/2 27 1/2 36 4 1.5
BA-5 5' 65 59 1/2 34 3/16 42 4 1.5
BA-6 6' 78 71 1/2 41 1/8 49 1/4 6 3.0
BA-7 7' 90 83 1/2 48 55 3/4 6 3.0
BA-8 8' 102 95 1/4 54 7/8 61 3/4  8 3.0
BA-10 10' 126 119 67 1/2 78 7/8 16 4.0
BA-12 12' 151 143 79 90  20 7.2 
BA-14 14' 176 167 1/4 92 5/8 105 1/4 20 9.3
BA-16 16' 199 191 105 117 1/4 24 9.3

*Will vary based on outlet diameter

Metalfab Silo Bin Activator for Discharging Lime

Application 1:  Bin Activator Mounted on Silo Discharge/Cone Hopper

Very few silo projects are successful without the use of a Live Bottom Bin Activator. We engineer the proper size Bin Activator to:

  • Match the bulk solid being stored in the silo
  • The diameter of the silo
  • The height of the silo
  • Recommend the slope of the silo hopper angle
  • Design the correct discharge opening to obtain the product flow capacity for your operation

Metalfab Posibin Surge Bin Day Hopper with Vibrating Bin Bottom Bin Activator, Continuous Discharge

Application 2: Silo Hopper / Bin Activator with Dual Volumetric Screw Feeders,  Continuous Discharge

This is a typical industrial bulk solids application to provide continuous metered flow of sluggish, non-free flowing powders.

  • The live bottom bin provides first in first out flow pattern into the volumetric crew feeder.
  • The screw feeder will only provide +/- 1% to 2% continuous output if the volumetric screw flighting is 100% filled.
  • These (2) pieces of equipment working in tandem will allow you to feed your process in an uninterrupted fashion.

Metalfab Bin Activator with Dual Volumetric Screw Feeders, Continuous Discharge

Lime hopper with Metalfab Bin Activator with Rotary Valve Feeder

Application 3: Silo Hopper / Bin Activator with Rotary Valve Feeder, Continuous Discharge

Silo Discharge to Pressure or Vacuum pneumatic conveying line applications for non-free flowing powders require rotary valve feeders to meter bulk solids into the conveying line.

  • The live bottom bin provides first in first out flow pattern into the rotary vane feeder.
  • The bin activator with full the vanes of the rotary valve to provide continuous output.
  • These (2) pieces of equipment working in tandem will allow you to feed your process in an uninterrupted fashion.

For more information on a MetalFab Sanitary Bin Activator 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

Related Products

  • Metalfab Bin Activators are used to create flow of dry bulk solids from vertical storage bins.
    Metalfab Standard Bin Activator / Silo Discharger

    Metalfab Bin Activator

    view now