Method of and Device for Cleaning a Metal Sheet
The invention relates to a method of a cleaning a metal strip ( 1 ). In order to improve the cleaning of the strip, according to the invention, it is provided that the metal strip ( 1 ) is first subjected to a first high-pressure cleaning ( 4 ) with at least one liquid jet in a first region ( 2 ) of a cleaning device ( 3 ), and in that the metal strip ( 1 ) thereafter is subjected to an ultrasonic cleaning ( 6 ) in a second region off the cleaning device ( 3 ), at which the metal strip ( 1 ) is displaced through a container filled with liquid. The invention further relates to a device for cleaning a metal strip.
1 - 22 . (canceled)
23 . A method of cleaning a metal strip ( 1 ),
characterized in that
the metal strip ( 1 ) is first subjected to a first high-pressure cleaning ( 4 ) with at least one liquid jet in a first region ( 2 ) of a cleaning device ( 3 ), and in that the metal strip ( 1 ) thereafter is subjected to an ultrasonic cleaning ( 6 ) in a second region of the cleaning device ( 3 ), at which the metal strip ( 1 ) is displaced through a container filled with liquid, and that the metal strip ( 1 ) is subjected, upon completion of the ultrasonic cleaning process ( 6 ), to a second high-pressure cleaning ( 8 ) with at least one liquid jet in a third region ( 7 ) of the cleaning device ( 3 ).
24 . A method according to claim 23 ,
characterized in that
the first region ( 2 ) is spaced from the second region ( 5 ), and that
the third region ( 7 ) is spaced from the second region ( 5 ).
25 . A method according to claim 23 ,
characterized in that
the first and, if necessary, the second high-pressure cleaning process ( 4 , 8 ) is effected with at least one liquid jet covering the width of a to-be-cleaned metal strip ( 1 ) and applied with a pressure between 50 bar and 200 bar, preferably, between 100 bar and 120 bar to the surface of the metal strip ( 1 ).
26 . A method according to claim 23 ,
characterized in that
the metal strip ( 1 ) is displaced vertically at least during one of the high-pressure cleanings ( 4 , 8 ) and/or during ultrasonic cleaning ( 6 ).
27 . A method according to claim 23 ,
characterized in that
during the first high-pressure cleaning ( 4 ) and, if necessary, during the second high-pressure cleaning ( 8 ) the used liquid is heated to a temperature of at least 60° C., preferably, to a temperature of more than 80° C.
28 . A method according to claim 23 ,
characterized in that
at the first high-pressure cleaning ( 4 ), at the ultrasonic cleaning ( 6 ), and if necessary, at the second high-pressure cleaning ( 8 ), the used liquid contains surface-active agents for bonding removable impurities.
29 . A method according to claim 23 ,
characterized in that
at the first high-pressure cleaning ( 4 ), at the ultrasonic cleaning ( 6 ), and, if necessary, at the second high-pressure cleaning ( 8 ), the used liquid contains surface-active agents and/or phosphate.
30 . A method according to claim 23 ,
characterized in that
at the first high-pressure cleaning ( 4 ), at the ultrasonic cleaning ( 6 ), and, if necessary, at the second high-pressure cleaning ( 8 ), the used liquid is alcaline.
31 . A method according to claim 23 ,
characterized in that
before the first high-pressure cleaning ( 4 ), a spray degreasing of the metal strip ( 1 ), in particular in an immersion or spray container, is effected.
32 . A method according to claim 31 ,
characterized in that
the spray degreasing of the metal strip ( 1 ) is carried out with a medium, in particular with a cleaning medium, that has a temperature of at least 60° C., preferably, above 80° C.
33 . A method according to claim 23 ,
characterized in that
after the second high-pressure cleaning ( 8 ), rinsing, in particular cascade rinsing with water, of the metal strip ( 1 ) is carried out.
34 . A device ( 3 ) for cleaning a metal strip ( 1 ),
characterized by
a first region ( 2 ) in which a high-pressure cleaning device ( 4 ) is located, a second region ( 5 ) which is arranged downstream, in the feeding direction (F) of the metal strip ( 1 ) and in which an ultrasonic cleaning device ( 6 ) is located, wherein the ultrasonic cleaning device ( 6 ) has a container ( 9 ) which is filled with liquid and in which ultrasound-emission means ( 10 , 11 ) is arranged, and a third region ( 7 ) which is arranged downstream, in the feeding direction (F) of the metal strip ( 1 ), of the ultrasonic cleaning device ( 6 ), and in which a second high-pressure cleaning device ( 8 ) is located.
35 . A device according to claim 34 ,
characterized in that
the ultrasound-emitting means ( 10 , 11 ) is arranged in a respective housing ( 12 ), in particular in a stainless steel housing, in the interior of the container ( 9 ) on both sides of the metal strip ( 1 ).
36 . A device according to claim 34 ,
characterized in that
the high-pressure cleaning devices ( 4 , 8 ) and the ultrasonic cleaning device ( 6 ) have separate containers ( 13 , 9 , 15 ) through which the metal strip ( 1 ) is displaced.
37 . A device according to claim 34 ,
characterized in that
the high-pressure cleaning devices ( 4 , 8 ) have at least one high-pressure nozzle beam ( 14 ) extending over an entire width of the strip ( 19 ).
38 . A device according to claim 34 ,
characterized in that
in the feeding direction (F) of the metal strip ( 1 ), in front of the first high-pressure cleaning device ( 4 ), means for spray degreasing of the metal strip ( 1 ) is arranged.
39 . A device according to claim 34 ,
characterized in that
in the feeding direction (F) of the metal strip ( 1 ), behind the second high-pressure cleaning device ( 4 ), means for rinsing of the metal strip ( 1 ) is arranged.
40 . A device according to claim 34 ,
characterized in that
the high-pressure cleaning devices ( 4 , 8 ) have a Pitot-tube pump ( 20 ) for producing high pressure of the liquid.