FLEXIBLE LANCE DRIVE APPARATUS WITH AUTOSTROKE FUNCTION
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United States of America Patent
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Issued Date -
Apr 13, 2017
app pub date -
Sep 20, 2016
filing date -
Oct 12, 2015
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Abstract
An apparatus for sensing an obstruction within a tube being cleaned and repetitively advancing and retracting a flexible high pressure fluid cleaning lance within the tube is disclosed. The method includes sensing a pneumatic supply pressure to a pneumatic lance drive motor at the motor during forward operation, sensing a pneumatic discharge pressure at the drive motor during forward operation, determining a difference between the pressures, comparing the difference to a predetermined difference threshold; reversing the drive motor direction for a predetermined time interval if the difference exceeds the threshold, and restoring forward operation after the predetermined time interval; and repeating the reversing and restoring operations until the difference no longer exceeds the predetermined difference threshold.
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