Unbalanced Condition
dear Rek: Your comments and concerns re installing this gate midway down the feeder is a real one.
These devices are designed to move material from point A to B and the key word being move.....
If we stall or back the material up on the feeder device, a few things happen........BED DEPTH INCREASES and we now have created a STATIC load backed up on the feeder and the stroke in the feeder will now be struggling to do its job.....
Hoping this helps......George Baker ■
Re: Controlling Discharge From Vibro Feeder
Dear Shri Rekhawar,
There is an inclined feed chute (mouth piece with gate) to feed on to vibrating feeder tray. Generally, the gate is located on above mentioned inclined feed chute (mouth piece). Such gate is only for setting and to create opening most suitable for the material behaviour and flow. This gate does not control (vary) the flow rate. The flow rate is controlled from the power supply to vibrator (frequency variation, voltage variation, etc). I have not come across any control gate across a vibrating feeder tray.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Controlling Feeder Discharge
Check this out, typical rule applied to CHUTEWORK controlling the feed flow out of a ELECTRO MAGNETIC FEEDER DEVICE.
http://www.jeffreycorp.com/feeders/HopperGuide.cfm
Basically when we install these in the field.......it is absolutely critical that the hopper design above these feeders....are designed correctly. IF NOT the material flows basically uncontrolled and can cause problems further down the process.
HOPING this theory is of help.......
George Baker - MODERATOR
Attachments
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Control Feeding From Unballanced Mass Feeder
Dear Mr. Rekhawar,
Apart from gate please provide VVVF controller for controlling the flow.
Regards.
A.Banerjee ■
Material Degradation In Vibro Feeders
Dear all,
Does a Vobro Feeder add to the Fines in the Material handled, because of the Vibration? Is there any study done to verify this?
What is the way out? ■
Creation Of Fines By Use Of Vibro Feeder
Hello:
First, I agree that the use of a variable speed drive on these type of feeders is desirable and in fact, the norm in many operations. On the ELECTROMAGNETIC feeder I mentioned in an earlier post, you can vary the speed easily by the use of a POTENTIOMETER DIAL to give more material or less.
Secondly, Creation of extra fines on these small units is typically a NON FACTOR.......as the stroke is typically very MINUTe or small and not particularly aggressive or strong enough to make more fines in these applications.
GEORGE Baker ■
Fines Generation By Vibro Feeder
Dear Mr. Rekhawar,
Yes, it leads to generation of fines due to vibration ( mechanical feeder), if the material is burnt lime ( manufactured from bad quality LIME STONE). But the extent of fines generation is too small.I think no test is required to measure the same.
Regards.
A.Banerjee ■
Controlling Discharge from Vibro Feeder
Dear all,
Is it desirable to control the discharge from Vibro Feeder by installing a slide gate at the middle of trough, vertically? The Feeder has unbalanced mass motors as excitors.
The Gate will be mounted on the top skirt cover of the feeder.
The Gate supplier has suggested this arrangement, however I apprehend that it may cause uneven bed depth in Feeder trough before and after the Slide gate. This will result in unbalance load at the rear & front end of the Feeder.
The Vibro Feeder is mounted below the bunker and a horizontal slide gate below the bunker will not operat due heavy column load of material.
The Feeder is 62.5 TPH for coke (0 to 80 mm) with Bulk Density 0.6 T/m3.
Regards ■