Electromagnetic Vibrator for powerful vibration



Questionnaire For Electro-Magnetic Vibrators

INTRODUCTION


`ELEKTROMAG' Eletromagnetic Vibrators are used to maintain free flow of stubborn materials through Bins, Hoppers, Chutes etc. They find wide applications in various industries such as Chemicals, Fertilizer, Steel, Coal, Washeries etc.

The Vibrators are of a simple design and robust construction to ensure long, trouble-free operation. The intensity of vibration is variable over a wide range through a suitable controller which ensures a steady uninterrupted flow of material under varying conditions.

The use of `ELEKTROMAG' Vibrators will eliminate unnecessary repetitive manual efforts to push and prod the material, resulting in considerable savings in costly manpower, avoiding the hazards arising there from and also preventing likely damage to the Bins and Hoppers.

The absence of the any major moving parts such as bearings, eccentrics, belts, motors etc. is another major advantage and consequently only minimum preventive maintenance is required.

Each Vibrator is supplied with a separate control unit consisting of a switch, fuse, rectifier rheostat. A.C. input to the rectifier is converted to pulsating D.C. which is then supplied to the Vibrator coil thus generating powerful Vibrations at a frequency of 3000 vibrations per minute. The Vibrators are designed for continuous operation. Vibrators can also be supplied into a dust-proof housing at extra cost.



THE CHOICE OF THE PROPER SIZE VIBRATOR DEPENDS UPON


  1. PURPOSE OF VIBRATION : To flow material or to compact or settle it
  2. CHARACTER OF MATERIAL : Whether dry and free or moist and sticky.
  3. THE WEIGHT OF MATERIAL : To be vibrated
  4. THE RIGIDITY : i.e. thickness of the hopper, chute or form.

The size of vibrator required to promote the flow of material in a hopper depends on many factors such as :
size, shape, construction (inclination of hopper face, thickness of hopper plate, number and stiffness of supports), kind of material in the hopper, the condition of the material whether wet or dry and grain size. A coarse grained material in 200 mesh or in large chunks would require considerably more vibration.

 
Vibrator Type Approx.
Capacity
Thickness Hopper Metal Power Consumption Approx. Weight of Vibrator
Normal Max. Watts / Volts Amps. Kgs.
EM 7511 0.85 Cu.Mt. 1.5 mm  3 mm   45 (220V)  0.7  10
EM   355 1 Cu. Mt. 3 mm  5 mm  132 (220V)  2.0  35
EM   315 2 Cu. Mt. 5 mm  8 mm  145 (220V)  2.2  45
EM   375 1 Vibrator / 20 Tons 7 mm 10 mm  198 (220V)  3.0  70
EM   842 1 Vibrator / 20 Tons 8 mm 12 mm  383 (415V)  5.5 110
EM   843 1 Vibrator / 40 Tons 12 mm 16 mm  460 (415V)  7.0 200
EM   845 1 Vibrator / 75 Tons 16 mm 25 mm 1500(415V) 12.5 385


 


APPLICATION OF "ELEKTROMAG" IMPACT VIBRATORS ON BINS, HOPERS, CHUTES


PARABOLIC HOPPERS

Hoppers of this shape should have the vibrators mounted within 12" of the outlet frame much closer to the discharge than on the other containers. Mount on centre line utilizing a channel for mounting.



RECTANGULAR HOPPERS


Mount same as above and on the centre line. One Vibrator will vibrate 3 sites of a hopper of this shape, to a degree which is generally sufficient. If additional vibration is required, a second unit can be mounted on the opposite side a different height.



RECTANGULAR BIN WITH HOPPER BOTTOM


Mount same as for rectangular Hopper. Possibly a larger unit will be required because of superimposed load. This style container is easily vibrated, for the hopper portion is generally smaller for a corresponding quantity of material than where all of the material is held in a hopper portion.



RECTANGULAR OR CYLINDRICAL BIN WITH FLAT BOTTOM AND CENTRE DISCHARGE


Bins with a flat bottom and centre discharge usually have a dead material storage which forms a hopper type discharge. The Vibrator should be mounted on the side of the bin just above where the angle of repose intersects the sides. The motion will prevent material from forming a material wall around the outside of the bin and reduce dead space to a minimum.



CONICAL HOPPERS


Sheet metal containers in the form of an inverted frustrum of a cone are ideal for providing efficient vibration. The Vibrator should be mounted directly to the hopper face about 1/4 to 1/3 a distance from the discharge to the top. When two units are necessary they should be mounted diamatrically opposite but at a slightly different height and properly phased.



HOPPER WITH CHUTE DISCHARGE


Mount Vibrator at a very bottom of this hopper, next to bottom side of sloping chute discharge. This will vibrate the hopper as well as the discharge chute.




HOPPER WITH VERTICAL SIDE


The Vibrator should be mounted on the slopping portion of the hopper, opposite the vertical side. It should be 1/4 to 1/3 or less from discharge to top of slopping side (area).



CONCRETE HOPPERS


Vibrators can be mounted on concrete hoppers, providing a heavy steel liner is used. The liner should extend from the discharge opening of the entire side to which the vibrator is to be mounted. The liner should be held down fast and rest on longitudinal ribs welded along the edge of the plate close enough, so material will not be able to seep underneath. At about 1/4 or less of the distance from the discharge to the top of the sloping side a hole should be cut large enough to allow the Vibrator to be mounted directly to the steel liner. Mount same as on steel hopper.



WOODEN HOPPERS


Wooden hoppers do not respond to vibration nearly as well as metal hoppers. Vibration cannot be transmitted around corners to other side or to as great distance. If construction is of planking supported on joists, then same instructions apply as for steel hoppers. Bolt direct to planking and make sure you use a large enough unit. If wooden hopper is lined with metal plate (as with concrete hopper) the Vibrator will be mounted on stilts going through the plate but clearing the wooden planking.



INCLINED CHUTES



Inclined chutes not steep enough to produce an easy flow of material, are benefited by the use of Vibrator. One Vibrator usually will handle a 10" to 14" length.

The unit should be mounted below the centre, so the lower portion receives the most provision for slight adjustment in both direction, for many times a slight position change will greatly enhance vibration efficiency.

On tubular chutes, the vibrator should be mounted to a flat or channel-shaped plate which in turn, is clamped to the chute by means of "U" bolts.

When using more than on Vibrator on along chutes, mount the first one within 2' of the discharge, the next halfway between first Vibrator and upper end of chute.


Vibrating Equipment