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Vibrator Selection, Vibrator Selection For Bin, Hopper and Silo Dischargers, Motor Vibrators, Vibrating Motor, Mumbai, India

 

Selection and Usage of Motor Vibrators :

Importance of vibrator selection need not be over emphasized. However good a range of vibrators available may be, unless a right model is chosen and applied correctly, no good and efficient results can be obtained. Therefore we, Sinex Prime movers present below at your, our valued customers' disposal, all the data, information and experience gathered during our over a decade long working on this subject.

Industrial uses of motor vibrators could be categorized into two types based on amplitudes involved ; (1) Tremors - micron level vibrations and (2) Large oscillations, in several millimeters. The former are encountered in silo and bin discharge applications and promoting material flow down chutes, ducts etc. while the later are found in equipment such as feeders, conveyors, spiral elevators, screens, vibratory tables etc.

Vibrator Selection for Bin, Hopper & Silo Discharge Application :

Years of experience and data collection have shown that force applied to bin walls should be 10 to 20% of material weight in the lower convergent part for satisfactory activation, dechoking and discharge.

Figure-1: Positioning Vibrators for Material Discharging

Taking into consideration the above in conjunction with bin sizes and wall thickness recommendations are tabulated at Table-2 to facility easy selection. Since tremors are at high frequencies it is appropriate to use 3000 rpm vibrators hence recommended force values correspond to this speed.

Table-2 : Vibrator Force values for Bin, Hopper & Silo Discharge

Bin Wall Thickness up to Bin dia./ diagonal up to Material Weight to be activated Kg.s
Recommended Vibrator Force in Newtons
Remarks
Single Two Three
2 450
560
700
25
40
70
400
560
900
500   Use Pneumatic Turbine Vibrators
3.2 630
800
1000
50
100
200
1000
1600
2500
1250   Pneumatic Piston Vibrators may also be considered
5 900
1100
1400
150
270
550
2800
3600
4500
1800
2250
1600
6.3 1250
1600
2000
400
825
1600
4500
5600
7100
3200
4000
2750 For difficult to flow materials & to gate uniform discharge other flow aids like Bin activator etc. may be considered
8 1800
2250
2800
1200
2300
4500
7100
9600
5600
7100
5000
10 2500
3200
4000
3200
6400
12500
12500
16000
8000
10000
12500
7100
9000
.

The above assumes material bulk density of 800 Kg s / cu.mt., bin walls not heavily stiffened and discharge openings not too small, which as a rule should be largest practically feasible. Forces may be varied in direct proportion to densities and in cubic 
to wall thickness.

Location of vibrators on storage vessel is very important from the view point of obtaining reliable discharge with minimum detrimental effect of brute force on the bin structure. Recommendations in this regards based on experience are shown in Figure-1

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