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Automatic vertical moving systems and control methods therefor

  • US 5,965,994 A
  • Filed: 03/10/1998
  • Issued: 10/12/1999
  • Est. Priority Date: 06/20/1997
  • Status: Expired due to Term
First Claim
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1. An automatic vertical moving system for vertically moving an object in order to analyze water quality continuously and monitor the vertical change of water quality, the moving system comprising:

  • a floating means for floating on the surface of water so as to be retained at a desired position thereon;

    a winch means mounted on the floating means, rotatable in opposite directions to lower and raise the object, and provided with a wire rope to be wound or rewound around the winch means according to the rotational directions thereof, the wire rope being connected at its free end to the object; and

    a forward-and-backward rotation means for rotating the winch means between a forward direction to lower the object and a backward direction to raise the object, said forward-and-backward rotation means including(a) an electric motor connected to the winch means which rotates in opposite directions,(b) an electric power supply means for supplying electricity, and(c) a motor control means for controlling the motor to be regularly activated or deactivated and to be changed in the rotational directions thereof,wherein said motor control means includesa driving control means for switching the electric power supply means to the motor on and off,a timer means connected to the driving control means for switching the electric power supply means to the motor on to activate the motor at predetermined suspending time intervals whenever the motor is deactivated,a plurality of guide rollers for guiding the wire rope to be wound or rewound steadily and for providing tension on the wire rope so that one of the guide rollers can not be rotated when the wire rope is loosened during the lowering,a counter means coupling with the one guide roller for detecting a rotational displacement thereof, and electrically connected to the driving control means for switching the motor off to deactivate the motor whenever the rotational displacement of the counter means is equal to a multiple of a predetermined rotational displacement interval corresponding to a predetermined unit depth during the lowering of the object and whenever the counter means is reset due to the raising of the object, anda direction control means connected to the counter means for converting the rotational direction of the motor when the rotational displacement of the counter means is not changed during the lowering of the object thereby raising the object, and when the counter means is reset thereby being capable of lowering the object after the predetermined suspending time by means of the timer means.

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