FUME EXTRACTION SYSTEM WITH AUTOMATIC FUME HOOD POSITIONING

  • US 20120111845A1
  • Filed: 07/16/2010
  • Published: 05/10/2012
  • Est. Priority Date: 07/17/2009
  • Status: Active Grant
First Claim
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1. A fume extraction system capable of automatically following an electric welding arc, the system including:

  • a base;

    a fume hood;

    an articulated exhaust duct robotic arm mounted between the base and the fume hood;

    a first pair of photoelectric sensors provided on the fume hood to sense the presence of the electric welding arc, the photoelectric sensors of the first pair being spaced apart from one another along a first axis;

    a second pair of photoelectric sensors provided on the fume hood to sense the presence of the electric welding arc, the photoelectric sensors of the second pair being spaced apart from one another along a second axis;

    a third pair of photoelectric sensors provided on the fume hood to sense the presence of the electric welding arc, the photoelectric sensors of the third pair being spaced apart from one another along a third axis, which third axis is substantially parallel to the first axis; and

    a control unit that generates command signals for the articulated exhaust duct robotic arm so as to automatically position the fume hood over the electric welding arc and maintain a predetermined height distance between the fume hood and the electric welding arc, the command signals being based on signals received from the three pairs of photoelectric sensors, the control unit including;

    a first control subunit that generates command signals for a motion of the fume hood along a first path above the electric welding arc based on the signals received from the photoelectric sensors of the first pair;

    a second control subunit that generates command signals for a motion of the fume hood along a second path above the electric welding arc based on the signals received from the photoelectric sensors of the second pair; and

    a third control subunit that generates command signals for a motion of the fume hood along a third path based on the signals received from the photoelectric sensors of the first pair and the photoelectric sensors of the third pair, the motion along the third path substantially corresponding to a height distance variation between the fume hood and the electric welding arc.

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