Fine Screening Special Features
Here are some interesting tips from an actual user:
Was fine screening sand at 2mm range in long slot END TENSION WIRECLOTH, was using a POWERSCREEN before this unit.
SPECIAL FEATURES built in for customer wish list:
- Variable Speed belt feeder, running very slow onto feed belt to screener (Key is to AVOID SURGES from hopper to feed belt)
- Special user friendly - easy in, easy out END TENSION FRAMES by use of rectangular access holes in sideplates of DILLON Screen
- PICKING IDLER style roller used on feed belt up to screen VS standard 35 deg idlers. 35 deg causes deep surge load onto centre line of screener and also causes more carryover and more INEFFICIENCY
- Special BATWING design feedplate vs a standard FLAT PLATE at top of conveyor. This wing is a V shaped feed plate tapering off to a thin edge at the outer edges. This makes the sand hit the plate and SPREAD OUT to the full width of the screen box and this makes for full use of the full OPEN AREA and more efficient screening. And you know what? It actually does work.
-Adjustable stroke range is greater on this unit than most sand screeners in the marketplace = FLEXIBILITY and availability to put more accelerating force or shake and bake into the box when the weather is a little damp or humid in particular. When it is a little more plugging or non free flowing....we can give the box a bit more vibration force.
-Adjustable screener angle from say 20 degrees to 40 degrees for dealing with days when the sand is very dry and free flowing to days when the sand is very damp, moist or slow flowing and in need of help from MOTHER NATURE with a titch more gravity or slope to increase the FOOT TRAVEL PER MINUTE.
This guy screens at 2mm.....to make winter sand and specialty sands for concrete boys and old his old unit would have to put in around 1/4" opg to try and get close to his 2mm specification.
JUST SOME INTERESTING TIPS on how to optimize when we are fine screening........Fine screening is tough stuff.
Comments or hints from the field would be appreciated.
Keep Smiling..........George Baker
Attachments
dillon portable 6x12 2 deck (ZIP)
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Bed Depth Tip
A tip towards more efficient screening:
When picking a belt for under a crusher position: think twice and act once.
Generally, you want to bump the width of the conveyor up a size to handle surge capacities....say jump from a 36" wide to a 42" wide belt width.
Now to improve efficiency........especially if loading from a secondary or tertiary stage of crushing (say concrete sand) try going to a 20 deg idler pick..........vs 35 degree.
WHY? This will actually have the material lay out flatter on the belt feeding the next screener in line in the circuit. It will feed the material more across full width of the screener and more importantly .........in a THINNER BED DEPTH off the belt onto the screener. More humane, more chance of getting the coarse out of the fine fraction.....typically more efficient product at the end of the day.
We just did this week........with another circuit we were laying out for a client .
Regards, George Baker ■