Greetings and salutations Sujeet from the frozen eastern wilderness @ 1140 fet above mean sea level.

The easier thing to do would be to see if a rubber coated screen is available for your application from your equipment vendor, it will save you a lot of headaches. ■

HERE We go......

1. Sounds overloaded to me, not moving down the deck.

2. Sounds like unit is too slow possibly.

3. Material stuck in openings actually backs up the material trying to move down the screen cloth

4. If I eliminate the plugging I eliminate the problem

5. If you used a crusher that did not produce ELONGATES or carrots, but did produce angular or cubical product, you would not have a problem plugging the screen.

6. You must be using a jaw or a cone crusher

7. Screen sound too small, should maybe be wider, which would handle more TONNAGE

8. Could try RUBBER decks, less OPEN area but, more self cleaning as the rubber kinda breathes to allow NEARSIZE to pass

9. YOUR SPEED STROKE AND SLOPE may be a misfit for the screening job you are doing

Good luck ■

Sujeet

You are runnning the screen at ~1.9 g - it is very low. I would think about increasing speed to 1000 rpm and then you will have ~4.5 g - this is a subject to natural frequency check before changing the speed. You can also change the stroke and speed but normally you should not go more than 5g. ■

I fooled around with this data you supplied:

1. 8mm stroke = .312" or nominal 5/16" circle size for STROKE

2. Stated RPM = 650

3. Accelerating Force or Operating G's: 1.9 agree with Ziggy

4. Screener size: 1600mmx4000mm or 5.3' wide x 13' long

5. Total screen area available: 68.9 square feet

6. TONS PER HOUR: UNKNOWN...important STPH OR MTPH

7. SCALPING SCREEN: installed at 20 degrees

8. Circuit: Raw Feed = 100% ROM limestone feed or otherwise stated 100% -24" blast rock containing nominal 44% of the total feed to the screener passing -50mm. HOW many TPH into the screen does it have to deal with?

9. Method of feed to the screen? Very important. Are we missing some of the screen when feeding onto it?

10. BIGGEST PROBLEM: blast rock is narly, carrot shaped, irregular shaped and fairly NON free flowing whilst trying to go thru an opening as undersize. The thin part of the arrowhead goes into the opening and stops and the FAT part of the stone trying to pass and stone passing over it SUPER JAMS IT.

11. The problem is arrowheads or carrots do not pass SQUARE OPENINGS they......JAM THEM.

12. What I notice in the description here is.......we are using the WORD SCREENING AND the word SCALPING in the same sentence and they are both completely different.

13. STROKE for this size of opening if on a grizzly feeder with a pan and a grizzly scalping section would be nominal 4" opening measured in the centre of the length of the grizzly bar. IE....a 5' long bar...you would measure the 4" at about 2.5' down the length...which means the last 2.5' would be slightly larger or SELF RELIEVING TO ALLOW arrowshaped pieces a chance to pass and clear.

14. THE SCREEN SETUP is wrong: for scalping or call it screening at this opening or -50mm (nominal 2" cut). The stroke is too small or non aggressive to statify the coarse fractions of the feed up ......so the small fraction of the feed can try to pass the aperture or opening. THE STROKE at 1.9 G's is NOT GOING TO DO THE JOB AT ALL. ....anything stuck in the hole will stay in the hole at 1.9 G.s....STROKE should be NOMINAL 3/8" minimum...could even be 1/2" by VSMA rules and the speed should be 840RPM.....this would plus minus equate to 3.8 G's plus minus and typical setup for coarse screening. 20 degrees is ok.

Attachments

step deck grizzly 84x16 (JPG)

■

This will not solve the problem you are having....stroke is too small to move the big fractions of the feed and speeding up.....will not improve that situtation unfortunately.

Best Regards, GB ■