Triple deck horizontal vibrating screen

Posted in: , on 11. Jan. 2007 - 07:49

Dear all

I have this maintenance problem with my new 3 decks horizontal vibrating screen.

Problem 1. Blinding of middle (5mm aperture) and bottom deck (3mm aperture)

Problem 2. Not enough space to service/change the middle and bottom deck.

i attached a photo of top and middle deck for your reference.

Can you all suggest any economic and practical ways of problem 1 & 2.

rgds

Attachments

b15mm (JPG)

Tight Deck Clearances On Horizontal

Erstellt am 12. Jan. 2007 - 03:27

Hello Faisal: Your situation is completely typical with horizontal screens.

1. I assume this unit is NEW?

2. Spacing between decks can be as tight as 9" between and this is to keep the height down to fit into low headroom spaces

3. YOU MUST remove the top deck to change the wirecloth in the second and same...remove 2nd to get to third

4. Special hand holes could have been built into the sideplate on original build to allow easier removal

5. It is important when installing one of these to design enough space around ends to work the sections out of the machine

6. Chutework on discharge ends should be DESIGNED to flop the top platework OFF on a hinge system or even SLIDE the total chute sideways out of the way on RAILS..to allow mtce access

........................................

PLUGGING AND BLINDING:

1. Sounds like you do not have enough STROKE length or G force to move particles out of the holes.

2. May have STROKE too big....clears the top deck but, just keeps material stratified up in the air on the 2 bottom decks

3. What is the actual operating SPEED by tachometer? may not be fast enough

4. The wirecloth may not be SMALL ENOUGH DIAMETER wires. This would make the OPEN AREA too small and cause deep bed depth of material which would press nearsize into the openings

5. How small are the OPENINGS? may need T304 stainless steel vs abrasion resistant wirecloth

6. You may need cross slots.........or FLEXMAT special non blinding wirecloth

7. Check FEED sieve analysis....may be a lot of nearsize to openings causing this problem

8. Check particle shape of infeed....is it from a crusher??? is it ARROW SHAPED? this will plug or blind openings.

9. I assume you machine is STATIONARY AT ZERO degrees flat?

Let me know how things check out..

Plugging along in 2007...

Best Regards, George Baker Regional Sales Manager - Canada TELSMITH Inc Mequon, WI 1-519-242-6664 Cell E: (work) [email]gbaker@telsmith.com[/email] E: (home) [email] gggman353@gmail.com[/email] website: [url]www.telsmith.com[/url] Manufacturer of portable, modular and stationary mineral processing equipment for the aggregate and mining industries.

5mm And 3mm Plugging

Erstellt am 12. Jan. 2007 - 03:31

ANOTHER point:

these openings are VERY TIGHT, VERY SMALL AND very prone to plugging. This is tough screening and the setup must be absolutely proper for the screen to work properly.

Lots of people have problems with screening this fine.

Do you have wirecloth that has cross slots by chance? if so how long are the slots and type of wirecloth.........is it nice and tight?

Best Regards, George Baker Regional Sales Manager - Canada TELSMITH Inc Mequon, WI 1-519-242-6664 Cell E: (work) [email]gbaker@telsmith.com[/email] E: (home) [email] gggman353@gmail.com[/email] website: [url]www.telsmith.com[/url] Manufacturer of portable, modular and stationary mineral processing equipment for the aggregate and mining industries.

Re: Triple Deck Horizontal Vibrating Screen

Erstellt am 19. Jan. 2007 - 03:30

1.I assume this unit is NEW?

Yes, it is new and is in operation since July last year.

2. Spacing between decks can be as tight as 9" between and this is to keep the height down to fit into low headroom spaces

It is 9” spacing. Can’t you all designer think of something better? Should not let the user like myself worry about this…

3. YOU MUST remove the top deck to change the wirecloth in the second and same...remove 2nd to get to third

Yeah..no option! We have to do that if we have to replace the bottom deck. But we are considering using water jet to clear the blinding.

4. Special hand holes could have been built into the sideplate on original build to allow easier removal

I cannot imagine this special hand holes, can you sketch?

5. It is important when installing one of these to design enough space around ends to work the sections out of the machine

6. Chute work on discharge ends should be DESIGNED to flop the top platework OFF on a hinge system or even SLIDE the total chute sideways out of the way on RAILS..to allow mtce access

PLUGGING AND BLINDING:

1. Sounds like you do not have enough STROKE length or G force to move particles out of the holes.

My supplier showed me how to check the amplitude. It looks like a “wall clock” (I don’t know what is the correct term for this gadget) except that replacing the number with variable dot diameters ranging from 1mm to 12mm. We placed the “wall clock” on the side plate to measure the amplitude. This diameter represents the amplitude when they are overlapped. The measured amplitude varies from 8 to 8.5 (from feed end to discharge end). I hope this answer your question.

2. May have STROKE too big....clears the top deck but, just keeps material stratified up in the air on the 2 bottom decks

I don’t know how to measure the stroke because I don’t know what the stroke is! I guess the stroke is X-axis while the amplitude is Y-axis of the screen movement (it is something like ellipse when I saw the screen start to move). Tell me more about this.

3. What is the actual operating SPEED by tachometer? may not be fast enough

Do you mean the rotating shaft speed? I can measure that. But from the manual, the shaft should rotate around 1014 rpm (1445 rpm x 247 / 352)

4. The wirecloth may not be SMALL ENOUGH DIAMETER wires. This would make the OPEN AREA too small and cause deep bed depth of material which would press nearsize into the openings

2nd Deck : #5.0mm X 1220mm X 2050mm (Plain)

3rd Deck : #4.0mm X 1200mm X 2050mm (Ondumat)

They are like noodles not like the top wire cloth, which is woven type.

5. How small are the OPENINGS? may need T304 stainless steel vs abrasion resistant wirecloth

6. You may need cross slots.........or FLEXMAT special non blinding wirecloth

7. Check FEED sieve analysis....may be a lot of nearsize to openings causing this problem

Screen opening

Top deck Feed end 15 mm Discharge end 10 mm

Middle deck5 mm

Bottom Deck3 mm

And this is the sieve analysis

+9.5 ~ 2542

+4.8 ~ 9.520

+3.4 ~ 4.05

+2.0 ~ 3.48

-224

8. Check particle shape of infeed....is it from a crusher??? is it ARROW SHAPED? this will plug or blind openings.

What can I do to change this arrow shape? The product is from a Gyratory crusher.

9. I assume you machine is STATIONARY AT ZERO degrees flat?

Yes, it is zero degree @ flat.

Let me know how things check out..

Plugging along in 2007...

ANOTHER point:

these openings are VERY TIGHT, VERY SMALL AND very prone to plugging. This is tough screening and the setup must be absolutely proper for the screen to work properly.

Please help me with the set up.

Lots of people have problems with screening this fine.

Do you have wirecloth that has cross slots by chance? if so how long are the slots and type of wirecloth.........is it nice and tight?

No idea! I have to comeback to the supplier.