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Thread: Vibrating Screen Calculations

  1. #1
    ktooley Guest

    Vibrating screen calculations

    Hi
    I am trying to design a new machine and I am wondering if anyone could helpl me check if the screen size will be big enough for the job.
    It will be a 3 deck screen screening topsoil down to 10mm. due to the design of the machine each deck will be a different size.
    The top deck will be 2.1m X 2.1m second deck 2.1m X 1.85m and the final deck would measure 2.1m X 1.7m.
    There will be approx 950 tons per hour going over it.
    Any help would be appreciated greatly
    Regards
    Keith

  2. Dear Keith,

    In order to get a meaningful answer, I suggest that you please specify incoming material, its characteristics and its size distribution. Please also mention the screen out size for each deck.

    At a glance, the size 2.1m x 2.1m for rate of 950 tonnes/hr looks to be inadequate. However, it depends upon the aperture size in deck. If the apertures are very big then possibly your size may be right. The size is also related to the screening efficiency.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  3. #3
    ktooley Guest
    Hi Ishwar
    Thanks for the reply
    The material will be topsoil (earth) and it will be very dry so will be very free flowing, particle size will vary greatly but maximum particle size will be approx 4 inch.
    I suspect that the screen size will be inadequate, however due to machine design there is not a lot of room. The feed elevator will also be 2.1m so the full width of the screen deck will be utilized, I only need to get aproximately 25% final sized material.
    The screen appertures I thought would be 2" on top deck then 1" then going down to a final half inch finished size.

    Regards
    Keith

  4. #4
    Ken Tuckey Guest

    Question screen sizing

    Hi Keith,

    Multotec is a Group with eight operating Companies, dealing in the minerals processing field. One of the companies specialises in screen cloth and is a manufacturer with many OEM clients. The screen you are proposing is an interesting challenge. Can you supply a full size distribution of the feed material and the moisture content? We may then be able to help with ideas.

    regards

    Ken

  5. #5
    George Baker

    George Baker

    Vice President- Corporate Communications

    Assinck Ltd. [eDir]

    Assinck Ltd.

    Professional Experience 39 Years / 9 Month George Baker has 39 Years and 9 Month professional experience

    Discussions 883 George Baker acceded to 883 discussions, Articles 0 George Baker wrote 0 articles, Publications 0 George Baker Baker released 0 publications

    Searching nothing specified

    Know-How Screening (373) George Baker used this tag 373 times, Manufacturer (110) George Baker used this tag 110 times, Conveying (28) George Baker used this tag 28 times

    Vibrating Screen Sizing Formula

    Hello: This data is the base data - I use for sizing vibrating screens. The formula starts with basic assumptions applied into a formula by VSMA to have a start point to begin with.


    Here is the mathematical formula to select and size the proper type of vibrating screen. Pretty much self explanatory. BUT, This data works on 7 big vibrating screen companies collection of basic INFIELD DATA, collected by actual EXPERIENCE. This equation is the "GENERAL rule of thumb" if you will. The BED DEPTH calculation is very very important to cross check after doing the sizing formula and double checking you are NOT working with too much material depth of the screen cloth.

    All of this data at the very end is once again subject to EXPERIENCE in the field, on the material being screened by EXPERIENCED operators imput.

    Important NOTE: This formula starts with a basic plug in EFFICIENCY of 95% assuming screening on the TOP DECK opening. If you only need 25% efficiency - the equation with give you a variable effiency factor adjustment value. This will make the machine smaller vs larger. More moisture = less free flowing = bigger deck needed to maintain efficiency, etc, etc.

    Lastly: Trommel type screens - Rotating drums quite often used here due to MOISTURE, NON FREE FLOW characteristics of top soil, clayey and compacting nature of material at times. Earth is very seldom dry free flowing in my experience.

    I am available to do FULL ONSITE "Generic Seminars in full detail on these topics if this is of interest. I have been doing this since 1977.

    8 attach pages included.

    Please let me know if more questions.

    George Baker - MODERATOR Aug 3, 2003
    bael@golden.net

  6. #6
    davidw Guest
    the screen you propose seems far too small regards from my experience

  7. #7
    George Baker

    George Baker

    Vice President- Corporate Communications

    Assinck Ltd. [eDir]

    Assinck Ltd.

    Professional Experience 39 Years / 9 Month George Baker has 39 Years and 9 Month professional experience

    Discussions 883 George Baker acceded to 883 discussions, Articles 0 George Baker wrote 0 articles, Publications 0 George Baker Baker released 0 publications

    Searching nothing specified

    Know-How Screening (373) George Baker used this tag 373 times, Manufacturer (110) George Baker used this tag 110 times, Conveying (28) George Baker used this tag 28 times

    How big should it be?

    if too small..........pls advise correct sizing. TKS....GEORGE

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