Rill Gates
Graham,
What I presume U are talking about is RILL gates.
The gates fit to a outlet and can be lowered down for operation and the material rills out onto the belt - when the belt is stop...the material will not spill out over the belt due to the rill (surcharge) angle.
When the belt starts, the material is feed out of the gate by gravity flow.
We have these installed under clinker storage sheds (halls) - cheap was of reclaiming along a long shed.
The gates downstream of the feeding rill gate have to be up - to prevent addtional flow plus prevent ploughing. If U are smart, U could design so that 2 gates could "blend".
The flow rate is a function of the belt speed and the material flowing thru the gate. As such, rill gates are typ used for free flowing materials.
Our rill gates are small..feeding a 900mm belt.
I believe that rill gates are also used in the grain industry.
Cheers
James Morrish ■
Re: Luffing (Lowering) Chutes
Graham,
For coal, did U look at stockpile dischargers eg Halley and Mellows, Malco etc. They are common - round inlet under the pile with a ring type vibrating section - intermittent vibratioins to re active the coal pile.
Underneath, there are 2 clam shell/arc gates to control the flow out onto the belt....the col usually floods onto the belt and to control the belt fill...there is an adjustable shear gate to prfile the load.
The belt speed is around 3m/sec to get high reclaim rates....wide belts as well.
Cheers
James ■
Re: Luffing (Lowering) Chutes
Dear James
Thank you for your reply telling me about your "Rill" gates.
The principle you describe seems correct for the application we have.
Where are these being used at present?
Regarding the other systems you mention, we do not really want to control the flow by introducing any restriction, clam-shell gate or otherwise, as the ROM coal is mainly small, but has a few very big lumps in it. To allow the lumps to pass would mean that the opening would be too big for the small stuff to be controlled.
Therefore a controlled flood-load onto the belt through a large aperture would be ideal. Also, we have far too many outlets to serve, and therefore we don't really want anything expensive or fancy. ■
Re: Luffing (Lowering) Chutes
James and Jonathon..
Many thanks for the information and the photos on the luffing (Rill) chutes.
It is exactly what I was looking for
Cheers ■
Luffing (lowering) Chutes
We have designed a luffing chute system to discharge ROM coal (minus 500mm) from a 10 000 ton bunker. It consists of 10 chutes in series over a 2100mm slow moving deep trough belt.
In the horizontal position the bunker outlet is covered and there is no coal flow, but as the end of the chute is lowered, the belt below is flood loaded to the correct load profile though a variable (but setable) aperture.
Before we build the system, our client is keen to see similar chutes operating on a similar application.
We have used luffing chutes many times before to load rail wagons and haul trucks, but never straight onto a belt.
Can anyone please advise where we can visit a plant with such a system?
Thank you.
Graham Spriggs ■