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FMC Bin/Hopper/Chute Vibrators

Syntron Electric Rotary Bin Vibrators
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Selecting the Proper Syntron Rotary Bin Vibrator

Bins or Hoppers

In order to move material in a bin or hopper, the friction between the material and the bin wall must be broken. Once the friction is broken, the material cannot cling to the sides of the bin and it will flow out through the discharge. For most applications, the vibrator force needed to accomplish this simply calculated as follows:

Calculate the weight of the material in the transition or sloping part of the bin. Normally, this is the only place where the friction between the material and the bin side has to be broken. Do not calculate the total weight, only what is in the transition part of the bin.
For conical bins, calculate as follows:
.261 x dia.^2 x height x material density in lb/ft^3 (kg/m^3)
For rectangular bins, calculate as follows:
Length x width x height x 1/3 x material density

When the weight (lb) has been calculated, divide the weight by 10 to get the force or impact needed from the vibrator (lbf). If the weight is calculated in kg, divide the weight by 1.02 to get the force or impact needed from the vibrator (N). For example: The conical part of a 25-ton bin contains 7000 lb Divide 7,000 by 10 to get the force (lbf) or impact needed from the vibrator. Find a suitable vibrator on pages six or nine.

Additional considerations when sizing vibrators to bins:

If bin side angle is less than 30 degrees, select larger vibrator.
If bin has vertical section, select a larger vibrator.
If bin wall is extra thick (see tables pages 5,6, and 8), select a larger vibrator.
On very sticky and hard to move materials, it is better to use two small vibrators instead of one large one (size the two smaller ones by dividing the required force in half).

Vibrating Tables for Packing Materials
Dense materials respond best to high-frequency vibration (3600 rpm of more), while light, fluffy or flaky materials respond best to low-frequency vibration (1800 rpm or less).

For packing or settling materials, use a vibrator with an impact force of one-and-a-half to two times larger than the weight of the material plus container. Find a suitable vibrator in the tables on pages six or nine.

Vibrating Screens
For self-cleaning screen, use a vibrator with a centrifugal force (impact) four times the weight of the material plus the weight of the screen.

NOTE: Coarse, lumpy, sticky or wet materials respond best to high-frequency vibration; powdery and dry materials to low-frequency vibration.

Consolidating Concrete
For three-inch "slump" concrete, use a vibrator with the same force (impact) as the weight of concrete and form. For one- to two-inch slump concrete, and additional 30 to 50 percent impact is needed. For dry mixes (zero slump) increase the impact by 100 to 200 percent.

Chutes
The force required of the vibrator is equal to the weight of the chute plus the vibrator plus the maximum material in the chute.

Electric Rotary Bin Vibrator RPM Selection Guide


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