Without seeing your set-up it is pretty hard to say. Is it possibe to install deflectors to get the flow to the area where you want? Failing that you will need to have the chute properly deigned by someone that truly understands transfer flows. ■

Yes, we have studied this effect. See our website: www.conveyor-dynamics.com Look at ROCKY DEM simulations. ROCKY allows a close up view of flow mechanics - pick your flow, material, discharge pulley and belt, and vibrating screen features. Various spreader plate shapes can be applied to study distribution efficiency.

See demo: http://conveyor-dynamics.com/rocky%2...g%20Screen.mp4 Unfortunately the mp4 takes a minute to download.

I can send an example with deflector concept - not optimized.

You can call CDI with information given below for clarifications. Ask for Mr. Jason Aldrich. ■

check this out for more general information:

http://www.ckit.co.za/secure/conveyo...i2-paper10.htm

lots of folks manfacture pantleg chutes to split feed 2 screens LEFT AND RIGHT....with sliding doors to increase or decrease the amount of total feed to the screen deck WIDTH.

LOTS of folks put inverted V's welded onto the FEED PLATE to their screen.... with the wide side or open side actually is open to the oncoming FEED MATERIAL coming onto the screen feed plate. Folks space em out across the width and it forces the material to spread out to the edges or full width of the screen deck. Open side fills up with material...theoreticdally does not wear out. POINTY end of the V......faces the discharge end of the screen. Material is forced to move out and around these V's

Plate steel...1-2" high x 3/8 or 1/2" thick plate kinda stuff. It does work.

Some fine material screeners ......very fine cuts ...will actually use a AUGER TYPE FEEDER Which drags the material to be FED TO THE SCREEN FEEDPLATE...across the width and fully feeds the screening device. J&H high frequency screen use this.

i will dig up some pics......later. ■

As Gary says, it is difficult to say without more specific information.

It sounds from your description like you are getting segregation within the transfer chute but it is not really clear.

There are many designs to help spread the feed across a screen surface. We have modelled a few different sorts and the results depend not only on the feed chute design but on the type of screen being fed. The choice of design will depend on the nature of the material as well as the configuration of the feed source in relation to the screen. It is not uncommon to see segregation from feed bins being reflected in screen loadings as well. ■

attached pictures maybe useful

Attachments

spreading before screen (PDF)

■

The British Coal Utilisation Researcg Association at Leatherhead developed a spread chute for generating a wide and even flow stream, I think, in was in the early 60's. It essentially forms the surface as a sector of a shallow cone, so that the material flows out in a radial manner. This can lead on to a chute with a flat surface if a straight 'waterfall' flow is required or, as a compromise, the end can be cut back to end straight across. Strictly, this allows slightly more material to run off the centre of the chute than at the sides, but the profile can be made with a tighter radius to compensate if you like a geometric challange. ■