Both APRON AND VGF can handle the job.....TPH rate is zero problem but,

Probably a bit more detail would be helpful here......is this a primary DUMP position......what is MAXIMUM TOPSIZE of the material?

Both APRON ON brute force VGF....are xl as primary FEED POSITON FEEDERS....can gang load ......deep bed depth......and both types will FEED by positive force from under the load no problem.

APRON IS more bits and pieces MECHANICAL components....more mtce intensive....chains, sprockets, cleated segments, all moving....

VGF......is more heavy duty.....RAM FEED DUMP ABUSE into it.....and vibrate out from under that load.....basically no problem ...meant to do this..

BUT, if live bottom feed from under a bin......you may well consider the use of ELECTROMAGNETIC PAN FEEDERS, which if sized properly....no biggie.....will easily handle this TONS PER HOUR AND MORE.......simple device, 10 deg slope....flow controlled by hopper arrangement ontop of it. IE: FMC style JEFFREYS....or many other of the same type.

Hoping feeding you some good information.........Cheers ■

As a general answer to a general question.....to be fair........both apron and vgf are good well proven heavy duty feeder devices.

The answer if you ask 10 people will probably be 50 50 for each......and every one is actually right for their own reasons.

Maximum feed size would help me to help you......even if 5 different locations or applications. ■

Vibrating feeders involve vibrating members. Their maintenance may need little bit more expertise and understanding compared to apron feeders. Since you have mentioned humidity, there may be sticking problems in the vibrating pans.

The final decision will be left to end users after considering the commercial issues. ■

As George suggested, both devices will work. Being a supplier of vibratory equipment, I am obviously biased, but a properly designed vibratory feeder should have little maintenance in comparison to an apron conveyor for the mere fact of having no mechanical parts in contact with the product.

A two-mass vibratory feeder offers the capability of a higher stroke output than a brute force feeder, which should solve any sticking issues. They also operate with considerably less horsepower than typical brute force feeders, which is a positive any way you look at it.

As far as capacity, vibratory feeders, again, properly designed, should excel at anything you are trying to accomplish.

Here is a link to General Kinematics two-mass feeders... if you have any questions as to the operation of these devices, please let me know.

http://www.generalkinematics.com/us/...m/productid/37

Thank you,

Thomas Musschoot

Director of R&D / Marketing

General Kinematics Corp.

www.generalkinematics.com ■

the information does not show me anything OVERLY pointedly problematic for the type of feeders being used.

THE only problem might appear if one of these feeders WAS PLUGGING, or not moving material FREE FLOWINGLY....on and off due to the small amount of moisture at 6%. 6% is no problem by the way.

DID YOU know that 6% moisture by VSMA rules.....is considered DRY? IT Is.

My friend from G-K who replied is very valid with his comment......and I still strongly believe, given the choice between and APRON feeder and a properly designed VGF feeder or BRUTE FORCE......brute force would win as the choice, assuming it is properly "SIZED" complete with a proper "BED DEPTH" caluculation to do the job.

MANY MANY MANY MORE PARTS are in contact with material and possible breakdown items with a BIG MECHANICAL CHAIN DRIVEN APRON FEEDER than a VGF. Clearance around a VGF is critical but, a standard design parameter, if you a tight around a VGF.....yes.......you will have problems. ■

To handle 1200 tph will need a heavy duty machine. We supply these as Electromagnetic type feeders with heavy duty power units & 100% variable speed. WE would need some more detail such as

Bulk Density

TPH

Max product size. transit length from outfeed to discharge

do you need a hopper interface section

Are there any limitations on feeder pan size (length or width)

Otherwise this should not be a problem

Regards

Allan Thompson

07788 105174

Rotex ■

The real advantage of an Apron feeder is it's speed range - easily 20:1 , sometimes more - say 150 Hz to 5 Hz in a motor of good condition .

The config you described - Bin/ Apron / Grizzly / Crusher is a commonly used crusher Optimisation scheme. The end objective is to feed the Crusher in Choke Feed to get the max thruput. The choke condition feedrate depends on the grain mix at a given time, the crushability of the ore at that time , fines content etc. Usually a control system senses the material level above the crusher and the crusher current to optimise the system by controlling the output of the Apron feeder..

In this application , a vibrofeeder in lieu of the Apron feeder may not be good - they are seldom better than 5:1 range - more often 3:1 . In this config , a fixed speed grizzly fed by an upstream variable speed Apron is usually the practice . ■