Application of VIBCO Pneumatic Turbine Bin Vibrators
Vibrator selection and installation is based upon individual application requirements.
VIBCO is always available to assist with the selection of the best vibrator to suit your needs.
For distribution of the vibration, each pneumatic turbine vibrator should be securely mounted midway, on a length of channel, welded with its legs against the side of the bin. Hopper should not “Drum” as this flexing will cause cracking of the hopper walls.
All vibrator models can be mounted with the shaft in any position, from horizontal to near vertical however VIBCO recommends, if possible, to mount the vibrator with it’s shaft horizontal.
For maximum effectiveness, chutes requiring vibrators should be independently isolated. In addition, the vibrator should be mounted midway on a channel located underneath the length of the chute.
For free flowing materials applications, vibrators on hoppers should operate only when the hopper is open to flow otherwise, packing of the material can result.
Normally – Do not use a VIBCO vibrator on an empty bin other than for a short period to clean out residue from the bin.
CONICAL BINS OR HOPPERS
The VIBCO vibrator should be placed approximately 1/3 for coarse materials (1/4 for fine grain materials) of the distance from the discharge opening to the top.
Should a second vibrator be necessary, it should be mounted diametrically opposite; for coarse material, mount one vibrator 1/3 up the side, the other 1/2 up. For fine materials mount the first vibrator 1/4 up and the second one 1/3 up. Welding a channel Iron with toes to bin wall is recommended. Where possible the mounting plate on the channel iron should be ‘ placed 1/3 to 1/4 of the distance L on the bin. Tack weld channel iron in place, then weld intermittent welds (75-150mm) 3-6″ long with (750mm) 3′ between them. Note: Stop welds at least (25mm) 1’ from the ends of the channel iron — do not weld the ends. The heat concentration when welding the ends could cause crystallization of the metal and the start of fatigue cracks.
Also see below detail on interference vibration.
RECTANGULAR BINS AND HOPPERS. One VIBCO vibrator generally clears the walls; if the material still sticks in the corners, increase the vibration by first changing the impact of the vibrator, or change to a larger size or use a second unit mounted opposite the first.
Check out the actual valley angle, this where the product hangs up. To give an idea a rectangular hopper with 45° sides has 35° valleys, even with 60° sides valley is 51°, check if product flows at the valley angle.
PARABOLIC BINS OR HOPPERS. Normally only one VIBCO vibrator is needed for each discharge point.
BINS WITH SLOPING DISCHARGE. The VIBCO vibrator is best mounted close to the transition between chute and bin to give the chute sufficient vibration for a steady flow.
BIN OR HOPPER WITH VERTICAL SIDES
Reacts the same as paragraph 2
Vibrators should be placed 1/3 from front.
If 2 vibrators are used place 2nd one directly opposite 1/3 from back. Do not run back one until bin is empty in front. Stop front unit.
Belt conveyor feeds from the front. Vibrator.
As the product is feed from the front of the bin, place the vibrator 1/3 the way up the back face.
SHORT SCREW FEEDER
Standard Screw Feeders (with fixed pitch) feed from the back. Vibrator should be mounted as close as possible to feeder on the back face. If 2 vibrators are used place 2nd vibrator directly opposite 1/3L on front face. Do not run front one until bin is empty in back
LONG SCREW FEEDERS
As fixed pitch screws feed from the rear product in front does not move and therefore will be compacted if vibrated. fit vibrator as for short screw or on the side onto a channel 1/3 the way along the bin. If screw is variable pitch vibrator can be moved forward, but recommend running intermittently to avoid compacting.
For real tough materials, large bins, bins containing different particle sizes or on a bin used to store different materials, “Interference Vibration” will obtain a better result in moving the materials.
This is achieved by using two VIBCO vibrators on the bin with different frequencies (speed). The most common electric vibrator speeds are 3000 and 1400 rpm. For example., A bin containing 15,000 lbs. of material needs 1500 lbs. of vibration force. We elect to use two vibrators, one 1400 rpm 4P-700 with 700 lbs. of force max, and one 2P-450 3000 rpm with 900 lbs. half force. The 3000 rpm unit is mounted closest to the discharge, 1/3 up the bin side, the 4P-700, directly opposite and 1/2 way up the bin side. The two frequencies of the vibrators will “interfere” with each other and create a simulated vibration of 3000 + 1400 = 4400 vpm to 3000 – 1400 = 1600 vpm. The cycling between 4400 vpm and 1600 vpm will, in 90% of all materials, go through the materials “resonance” frequency. At “resonance” frequency, any material will flow easily and freely. This is the reason why at interference vibration you will move the most stubborn materials. Consult VIBCO for further details.
Air vibrators can also be used in the same way and they give a wider range of possible speeds.
For your initial enquiry on a Vibco product please contact below;
15 Doyle Avenue
Unaderra NSW 2526
T: 1300 585 069