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'[OT] Position Sensor'
2002\12\23@004740 by 1?q?Carlos=20Marcano?=

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Hi... I am trying to build a closed loop system to
control de alignment of a transportation belt
(transporting iron mineral)... I have had some trouble
finding out about a good position sensor for it... I
don4t want to use limit switches, I want something
more precise, please tell me about your suggestions...
Thanx,

*Carlos*

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2002\12\23@013648 by Wagner Lipnharski

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Carlos Marcano wrote:
> Hi... I am trying to build a closed loop system to
> control de alignment of a transportation belt
> (transporting iron mineral)... I have had some trouble
> finding out about a good position sensor for it... I
> don4t want to use limit switches, I want something
> more precise, please tell me about your suggestions...
> Thanx,
>
> *Carlos*


Rotational sensors right outside the belt moving area. If the belt moves
out of position, it will spin the sensor wheel by dragging force, wheel
rotating indicates the belt is out of alignment and some shaft should be
twisted to force the belt back to its alignment.  Many ways to sense a
rotating wheel, not magnetic of course, you will have many iron particles
around, perhaps optical or even mecanical.  A special shaft with several
dumb wheels installed below the belt, exactly the two wheels outside the
belt would be the sensors.

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2002\12\23@025557 by Josh Koffman

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An infrared beam sensor can be made very precise with added optics. Have
the belt break a beam of light if it wanders to either side. A harder
option would be some sort of computer vision system. It would be harder
to achieve, but if you will have lots of ore falling everywhere, might
be more reliable. You could mount the camera higher up so it wouldn't be
effected if something fell off the side of the conveyor.

Josh
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Carlos Marcano wrote:
> Hi... I am trying to build a closed loop system to
> control de alignment of a transportation belt
> (transporting iron mineral)... I have had some trouble
> finding out about a good position sensor for it... I
> don4t want to use limit switches, I want something
> more precise, please tell me about your suggestions...

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2002\12\23@090456 by Gordon Niessen

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Have two light emitters on a top board, and two detectors on a bottom board
so that they are clear of the belt.  Then cant the angle of the board
so  that one of the emitter/detectors is at the inner limit of the belt,
and the other is at the outer limit (this makes calibration easy by
adjusting the angle).  If the inner detector lights, then the belt is
drifted in too far.  If the outer detector is blocked, then the belt is out
too far.  Depending on the distance apart, you may need to use lens to
focus the beams.  And set the threshold so that you don't get false
readings as it gets dirty.

You might need to mount this on a follower device that moves it away from
the actual belt.  And don't forget to debounce the signals.

At 11:46 PM 12/22/2002, you wrote:
{Quote hidden}

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2002\12\23@095625 by Chris Loiacono

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If you have, or can place a sprocket or gear on a shaft, a limit switch and
a reluctance sensor will cost pennies and give you nearly incredible
position accuracy. I did this on a printing machine and was able to start
and stop auxiliary processes at tiny incremental points on each printed
page....
> Hi... I am trying to build a closed loop system to
> control de alignment of a transportation belt
> (transporting iron mineral)... I have had some trouble
> finding out about a good position sensor for it... I
> don4t want to use limit switches, I want something
> more precise, please tell me about your suggestions...
> Thanx,
>
> *Carlos*

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2002\12\23@111306 by 1?q?Carlos=20Marcano?=

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Thanx everyone for the ideas, I really apprreciate
them!

*Carlos*

_________________________________________________________
Do You Yahoo!?
Informacisn de Estados Unidos y Amirica Latina, en Yahoo! Noticias.
Vismtanos en http://noticias.espanol.yahoo.com

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