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stroke check troubleshooting inclined screen (ZIP)
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Re: Coarse In The Fines??? Why???
George
Chute work should be relatively easy to correct - I presume your screen has a proper discharge lip so there is enough space for chutes.
Are you running the screen forward or backwards - if you running backwards and the distance between fine and coarse chutes is small that could be another reason.
Test cards do not look good to me - possibly local frequency at the feed end ( bending horizontal).
Discharge end left hand side - shape of the stroke indicate some problems - the stroke above you marked is also small and out of shape.
If the screen was OK in the workshop you have to recheck if anything has happened during transport and there is a chance that the supporting structure has a natural frequency very close to the running speed of the screen.
Have the changes you've made in the field corrected all the problems? ■
Re: Coarse In The Fines??? Why???
George,
Thanks for the insight. I've not yet come across the situation but it was so lucidly explained that folk will know exactly what to look for & rectify when it happens. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Problem Was Solved By Correction
ZIGGY: this change fixed the problem with overs in the fines...most economically.
IE: adding piece of conveyor belting onto the discharge lip and removing the hard rubber which was causing the stroke to be wonky.
this screener has a small stroke to begin with...
Best Regards. ■
Coarse in the fines??? WHY???
TROUBLESHOOTING a customer complain of coarse in the 2nd unders FINES.
1. We were commissioning a new vibrating screen startup. Unit was a 2 bearing, circle throw, inclined screen with 1/2" over 6mm wirecloth.
2. Sieve analysis revealed their 2nd deck unders was contaminated or off spec....due to COARSE particles showing up in the product sieve bend.
3. See the STROKE CHECK card I did in the field for the SOLUTION.
4. Customer was having coarse go over the 2nd deck, onto the discharge lip and fall into a GAP opening at the customer installed chutework. Coarse would curl under the lip and drop into the fines.
5. Customer had installed a HARD PIECE of rubber into this gap, tight to the underside of the discharge lip and this caused the machine to show UNEQUAL CIRCLES due to the restriction.
6. Had customer remove hard rubber gap filler and instead had him install a light piece of rubber ontop of the 2nd deck discharge lip to lay onto the stationary CHUTEWORK....no more gap equals no more COARSE in the fines.
Attachments
stroke check troubleshooting inclined screen (JPG)
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