How does this piezo transducer couple?

Discussion in 'Electrical Engineering' started by DaveC, Aug 10, 2013.

  1. DaveC

    DaveC Guest

    <
    http://www.ebay.com/itm/100W-28KHz-Ultrasonic-Piezoelectric-Cleaning-
    Transducer-Ultrasonic-Cleaner-
    /171095661313?pt=LH_DefaultDomain_0&hash=item27d6189b01>

    The bolt running through the center appears (repeat: appears) to bolt the
    ends of this transducer together. Which defeats the goal of a transducer of
    this type (to vibrate in the axial direction).

    How does this transducer couple the brown ceramic disc piezos to the
    "business end" (upper, in the main photo)?

    Someone suggested that the bolt is actually a threaded tube with some kind of
    driver stud in the center (if you look closely there does appear to be 2
    separate pieces that make up what looks like the "bolt").

    ??
     
    DaveC, Aug 10, 2013
    #1
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  2. DaveC

    DaveC Guest

    > I would think the bolt is to mount it and the energy coupled by inertia.

    I agree with your assumption. But if the bolt goes completely through the
    transducer, it cannot allow piezo (mechanical) movement in the axial
    direction.

    Note:
    1. The non-business end is very heavy, steel or such
    2. What you see protruding from the cone end (the "business end") is just a
    short stud. This can be welded or otherwise adhered to whatever you want to
    drive with this transducer and the transducer screwed onto the stud. I think
    this stud is not the other end of the bolt head you see at the heavy end.
    3. The bolt begins at the back (steel end) and goes... where? This is the
    conundrum. It can't go all the way through.
    4. The heavy end acts as the large mass (I think of it like an anchor)
    against which the piezo works the other end (the "business end") of the
    transducer.

    But the question remains: where does the allen bolt thread into? ::

    <http://tinyurl.com/mxkg9t8>
     
    DaveC, Aug 10, 2013
    #2
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  3. DaveC

    Joerg Guest

    DaveC wrote:
    > <
    > http://www.ebay.com/itm/100W-28KHz-Ultrasonic-Piezoelectric-Cleaning-
    > Transducer-Ultrasonic-Cleaner-
    > /171095661313?pt=LH_DefaultDomain_0&hash=item27d6189b01>
    >
    > The bolt running through the center appears (repeat: appears) to bolt the
    > ends of this transducer together. Which defeats the goal of a transducer of
    > this type (to vibrate in the axial direction).
    >
    > How does this transducer couple the brown ceramic disc piezos to the
    > "business end" (upper, in the main photo)?
    >
    > Someone suggested that the bolt is actually a threaded tube with some kind of
    > driver stud in the center (if you look closely there does appear to be 2
    > separate pieces that make up what looks like the "bolt").
    >


    One guess is that the bolt might be supposed to go through the surface
    you want to insonicate and continues into some sort of support post or
    structure. It's probably not to be torqued down with gusto, only meant
    to hold the transducer in place.

    Alternatively, the device may be mountable using a large soft washer and
    insonication occurs by using its large mass, as Rheilly wrote. That
    washer would have to be able to tolerate a lot of stress.

    The red stuff around the bolt could be some sort of spacer material that
    makes sure the bolt won't touch the PZT.

    Why not ask the seller about the manufacturer's name?

    --
    Regards, Joerg

    http://www.analogconsultants.com/
     
    Joerg, Aug 10, 2013
    #3
  4. In article
    <-september.org>,
    DaveC <> wrote:

    > <
    > http://www.ebay.com/itm/100W-28KHz-Ultrasonic-Piezoelectric-Cleaning-
    > Transducer-Ultrasonic-Cleaner-
    > /171095661313?pt=LH_DefaultDomain_0&hash=item27d6189b01>
    >
    > The bolt running through the center appears (repeat: appears) to bolt the
    > ends of this transducer together. Which defeats the goal of a transducer of
    > this type (to vibrate in the axial direction).
    >
    > How does this transducer couple the brown ceramic disc piezos to the
    > "business end" (upper, in the main photo)?
    >
    > Someone suggested that the bolt is actually a threaded tube with some kind of
    > driver stud in the center (if you look closely there does appear to be 2
    > separate pieces that make up what looks like the "bolt").
    >
    > ??


    Various poorly translated web pages say that the bolt is a spring and
    the metal cone is for impedance matching. It sounds like you shouldn't
    mess with the bolt.

    It looks like you need some high grade epoxy adhesive:
    http://bluewaveinc.com/ultrasonic-cleaning-101/
    http://hessonic.com/wp-content/uploads/2012/02/fundamentals.pdf
     
    Kevin McMurtrie, Aug 11, 2013
    #4
  5. DaveC

    Shaun Guest

    "DaveC" wrote in message
    news:-september.org...

    <
    http://www.ebay.com/itm/100W-28KHz-Ultrasonic-Piezoelectric-Cleaning-
    Transducer-Ultrasonic-Cleaner-
    /171095661313?pt=LH_DefaultDomain_0&hash=item27d6189b01>

    The bolt running through the center appears (repeat: appears) to bolt the
    ends of this transducer together. Which defeats the goal of a transducer of
    this type (to vibrate in the axial direction).

    How does this transducer couple the brown ceramic disc piezos to the
    "business end" (upper, in the main photo)?

    Someone suggested that the bolt is actually a threaded tube with some kind
    of
    driver stud in the center (if you look closely there does appear to be 2
    separate pieces that make up what looks like the "bolt").

    ??


    Stick it up your ass, I'm sure it will couple to the inside of you colon!!
     
    Shaun, Aug 15, 2013
    #5
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