Method, system and apparatus for scraping a roll surface in a molten metal coating process
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United States of America Patent
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Oct 20, 2009
Issued Date -
N/A
app pub date -
Jan 10, 2008
filing date -
Feb 15, 2005
priority date (Note) -
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Abstract
A method is disclosed for scraping a roll surface rotating in a molten metal coating process comprising traversing a support assembly to one side, lifting the arms attached to said the assembly to a fully retracted position to disengage scraper blades from contact with a roll surface; initiating a scrape cycle by means of a trigger signal; lowering the arms and scraper blades in the mid-point of the sink roll; increasing the pressure reference from lifting pressure to approximately zero; energizing one or more directional valves; increasing the pressure value gradually to a preselected pressure; extending the cylinder in a controlled manner to engage the scraper head gently on to the sink roll; moving the engaged scraping head at controlled, predetermined speed from the sink roll mid point to the fully traversed out position; stopping the traversing means upon reaching the fully traversed out portion; and lifting the scraper head from the roll surface by removing pressure from the cylinder; then repeating the sequence until a predetermined number of cycles are completed.
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