Re: Screening Holes Design
where is the photo? ■
Forgotten Picture
Sorry that I forgot to attach the picture, here it is
Attachments
15-06-07_0947resized para forum (JPG)
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Screening Media Recommendation
Some observations and comments:
First of all, thankyou for your question.
1. Note this is perf plate.......Why? Is this separation impact abusive? HOT or?
2. The thickness of the plate causes reduced open area and reduced screening efficiency
3. CONFIRM the hole opening please. Size. Clear opening or mesh size.
4. What is the material description? Cubical, elongated, wgt per cu ft, friable, non free flowing, hot, cold, etc?
5. Do have the sieve analysis TO THE SCREEN media....like ....is there lots of near size to the actual opening trying to pass also?
6. If lots of nearsize.......can you change the opening a little bigger or a little smaller? This may help.
7. Try a nice piece of FLEXMAT stainless steel wirecloth, this wirecloth is SELF RELIEVING in nature and will help itself stay clean. GOTTA like that........:>) It really works.
8. That perf probably does not have 40% open area.....by the pic...which of course means 60% restriction.
Some feedback would be excellent. Tks George Moderator ■
Any Answer To My Questions?
igortorrealba: how is your problem progressing? ■
Re: Screening Media Recommendation
Good Morning Mr. George, I am sorry that I didn't get back to you before, ok I will try to answer your questions one by one...
1. Note this is perf plate.......Why? Is this separation impact abusive? HOT or?
There is no much information provided by the fabricant about the plates, but some of what we have is that this is a cast iron plate, resistant to high temperatures, the particles get to the plate at about 700°C, so that's what makes it complicated. When you talk about separation impact, do you refer to the height from which the particle falls to the screen, if so, it is more o less than 12 cm.
2. The thickness of the plate causes reduced open area and reduced screening efficiency
The thickness of the plate is 15mm
3. CONFIRM the hole opening please. Size. Clear opening or mesh size.
Area of the hole: 318,578 mm2, size of one plate (there are two put together): 1115mm*760mm
I have calculated the total opening area and it is only 24% of the total screen area.... so I guess that there is one of the big problems..., the machine manage aproximately 35 Ton/hr, but the fisrt screen (for the briquettes) takes away a lot of that.
4. What is the material description? Cubical, elongated, wgt per cu ft, friable, non free flowing, hot, cold, etc?
the material that comes to the screen is one of an irregular shape, like rocks, mostly elongated, hot, non friable, with a density of about 5 gr/cm3, the same as the briquettes.
5. Do have the sieve analysis TO THE SCREEN media....like ....is there lots of near size to the actual opening trying to pass also?
Well I have taken out all the chips from the screen of the picture, and most of their sizes are lower than the actual opening size, I'd say about 98%.
6. If lots of nearsize.......can you change the opening a little bigger or a little smaller? This may help.
I think that the size of the opening could be reduced, the rolling machine accepts chips with a maximun of 6mm, well I am not completely sure of that but I'll get you that info too.
7. Try a nice piece of FLEXMAT stainless steel wirecloth, this wirecloth is SELF RELIEVING in nature and will help itself stay clean. GOTTA like that........:>) It really works.
8. That perf probably does not have 40% open area.....by the pic...which of course means 60% restriction.
answered after question 3. OK Mr George, thanks for your interest...
Some feedback would be excellent. Tks George Moderator [/B][/QUOTE] ■
Re: Screening Holes Design
Igor:
me gustara que nos comuniquemos
escrbeme podemos prestarnos mutua utilidad.
saludos
adolfo.barrios@gmail.com ■
Screening holes design
Goog Morning, I am an Undergraduate student of mechanical engineering in Venezuela and I am doing my graduate project on the optimization of a screening preccess in a iron reduction plant. We have Schenck vibrating screen machines, and we separate the briquettes at first without a problem, but the we have to separate the chips and the fines, the fine is for recycling to the briquetting machine, but most of it is leaving the machine with the chip. We have found when the plant stops and we open the machine that the lower screening area is reduced by the chips thats stayed stucked in the holes. I have been looking for information on these type of screen so we can come up with a different geometry of the holes, maybe soften the edges or something, but anyway, I would like to receive your opinion or recommendation on these thread. Also some screening theory for calculating the efficiency of the screening would be very appreaciated. I am attaching a picture of the screen to show you what I am talking about and excuse my english, I need some practice! thank you in advance!
Note: To have a reference the screen on the picture is 1.00 m long ■