WO2018219775A1 - Identification of dry areas on oiled steel strips by means of uv light - Google Patents

Identification of dry areas on oiled steel strips by means of uv light Download PDF

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Publication number
WO2018219775A1
WO2018219775A1 PCT/EP2018/063646 EP2018063646W WO2018219775A1 WO 2018219775 A1 WO2018219775 A1 WO 2018219775A1 EP 2018063646 W EP2018063646 W EP 2018063646W WO 2018219775 A1 WO2018219775 A1 WO 2018219775A1
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WO
WIPO (PCT)
Prior art keywords
sensor
light
belt
wetting
oil
Prior art date
Application number
PCT/EP2018/063646
Other languages
German (de)
French (fr)
Inventor
Jürgen Scharlack
Lorenz TIELSCH
Kersten FRIESE
Andreas WESTERFELD
Original Assignee
Thyssenkrupp Steel Europe Ag
Thyssenkrupp Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssenkrupp Steel Europe Ag, Thyssenkrupp Ag filed Critical Thyssenkrupp Steel Europe Ag
Publication of WO2018219775A1 publication Critical patent/WO2018219775A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging
    • G01N2021/646—Detecting fluorescent inhomogeneities at a position, e.g. for detecting defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8411—Application to online plant, process monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • G01N2021/8427—Coatings
    • G01N2021/8433—Comparing coated/uncoated parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/86—Investigating moving sheets
    • G01N2021/8609—Optical head specially adapted
    • G01N2021/8627—Optical head specially adapted with an illuminator over the whole width
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details
    • G01N2021/8908—Strip illuminator, e.g. light tube
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N2021/8918—Metal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging

Definitions

  • the present invention relates to a method for detecting the degree of wetting of the surface of a longitudinally moving strip of at least one material by irradiating the surface to be examined over its entire width with UV light and detecting the radiation reflected from the surface by means of a sensor over the entire width the surface, wherein the UV light source and the at least one sensor are mounted stationary to each other and to the moving belt, a corresponding device and the use of this device.
  • DE 10 2008 050 598 A1 discloses a system for detecting media, for example oil, on surfaces.
  • the surface is irradiated with radiation from a radiation source.
  • the reflected radiation is then detected by a sensor and evaluated, so as to be able to determine the wetting on the surface.
  • Radiation source and sensor are movably arranged in this process, so that they traverse over the surface during the measurement, since a complete detection of the entire surface with this method is not possible.
  • the present invention therefore has for its object to provide a method with which the degree of wetting of the surface of a strip, in particular a steel strip, can be detected so as to be able to detect whether a sufficient film of a medium, in particular an oil film, is present on the surface. is present. It should be possible to be able to continuously observe a section of a band across the entire width, so that the corresponding information is accessible as quickly as possible. Furthermore, it should be possible for the process to be carried out directly in an oil machine known to the person skilled in the art.
  • the present invention therefore relates to a method for detecting the degree of wetting of the surface of a longitudinally moving strip of at least one material by irradiating the surface to be examined over its entire width with UV light and detecting the radiation reflected from the surface via at least one sensor entire width of the surface, wherein the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt.
  • Essential to the invention is that the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt. These features of the present invention provide the advantages that the belt moving in the longitudinal direction can be observed continuously and over the entire width. On the one hand, this significantly increases the speed of the method according to the invention over prior art methods. Furthermore, the method according to the invention eliminates the step in which an image of the surface over the entire width must be created from a plurality of individual images, so that it is less prone to error. Furthermore, in comparison to the prior art less moving components are present, so that overall the maintenance costs and the accident risk are significantly reduced.
  • the band moving in the longitudinal direction is irradiated over the entire width with the UV light source, and the sensor detects the reflected radiation in the visible range over the entire width of the band.
  • the belt can be observed by the sensor at one time across the entire width and at each point of the belt.
  • the traverse speeds in prior art devices are 250 to 500 mm / s, i. in that at a standard belt speed of 120 m / min and a belt width of 2000 mm, 16 to 32 m of the belt move under the sensor until it is in the same position again, so that most of the belt is not detected by the sensor.
  • the degree of wetting of a belt moved in the longitudinal direction is determined from at least one material.
  • the at least one material is preferably metallic surfaces such as steel, aluminum, copper alloys or stainless steel.
  • the material is steel, d. H .
  • the surface of a flat steel product, in particular a steel strip is preferably determined.
  • the present invention therefore preferably relates to the method according to the invention, wherein the strip of at least one material is a flat steel product, more preferably a steel strip.
  • the width of the tape is preferably 550 to 2200 mm and the thickness of the tape 0.4 to 4.0 mm.
  • the present invention therefore preferably relates to the method according to the invention, wherein the width of the tape is 550 to 2200 mm and the thickness of the tape is 0, 4th to 4 mm.
  • the length of the band is for example 100 to 7000 m. It should be noted that the inventive method is preferably carried out continuously, d. H . a very long belt is moved in the longitudinal direction while the process according to the invention is carried out. Therefore, preferably only a section of the total length of the strip is observed with the method according to the invention.
  • the moving belt which is observed according to the invention, has been obtained in a preferred embodiment of the process according to the invention by appropriate methods known to the person skilled in the art, for example hot and / or cold rolling.
  • the process of the invention is preferably carried out after oiling the surface of the steel strip.
  • the process according to the invention very particularly preferably takes place in an oil machine known to the person skilled in the art directly after the oiling of the steel strip.
  • the degree of wetting of the surface is defined as the ratio of unwetted surface of the tape to the entire surface of the tape to be examined. According to the invention, it is thus preferably detected whether the surface to be examined is completely covered with a medium. Complete coverage of the surface with the oil corresponds to a degree of wetting of 1. If there are sites on the surface which are not covered with the medium, the degree of wetting is less than 1. Wetting degrees of less than 1 are undesirable and should be achieved by the process according to the invention be detected.
  • either only the upper side of the moving belt, or only the underside of the moving belt or both top and bottom of the moving belt, can be observed.
  • a comparison of the detected values can be carried out more preferably.
  • the skilled person refers to sites on the surface that are not completely wetted with the medium, in particular an oil, as so-called dry spots.
  • the process of the invention preferably serves to prevent dry spots, i. incompletely wetted sites, on the surface of a longitudinally moving belt of at least one material to detect.
  • the present invention therefore preferably relates to the process of the invention wherein dry spots, i. incompletely wetted sites are detected on the surface of a longitudinally moving belt of at least one material.
  • the layer thickness of the medium is determined by the inventive method, for example, the detected image of the medium film, in particular the oil film, be evaluated with a suitable software, so that the detected gray or color values inference to the Allow layer thickness.
  • the light detected by the sensor is converted in the visible range into corresponding gray values. These gray values can then be used to determine how complete or strong the wetting of the tape is.
  • the conversion of the signal detected by the sensor into corresponding gray values can be carried out by methods known to the person skilled in the art respectively. Low gray values correspond to low wetting by the medium, high gray values correspond to high wetting by the medium.
  • a medium is preferably understood as meaning a liquid which is applied as a film to the surface of the strip.
  • the film thickness is preferably 0.30 ⁇ to 2.5 ⁇ , more preferably 0.33 ⁇ to 2.2 ⁇ .
  • Preferred media according to the invention are selected, for example, from hydrophobic media, for example oils, or aqueous compositions, for example emulsions.
  • the medium present on the surface is a hydrophobic medium, preferably an oil.
  • the present invention therefore preferably relates to the process according to the invention, wherein the surface is wetted with a hydrophobic medium, preferably an oil.
  • the amount of medium, preferably oil, which is present on the surface is not limited according to the invention, preferably 0.3 to 2 g / m 2 of the medium, preferably of the oil, is present on the surface.
  • the surface to be examined is irradiated over its entire width with UV light. More preferably, the entire width of the tape is irradiated as uniformly as possible with UV light, i.
  • the intensity of the UV light differs in individual sections of the width of the belt by no more than 5% with respect to the maximum value of the intensity during the measurement.
  • the surface to be examined is irradiated with UV light, in particular with UV-A light, UV-B light or UV-C light.
  • the present invention preferably relates to the method according to the invention, wherein the surface to be examined is irradiated with UV-A light.
  • the preferred type of radiation UV-A light according to the invention is known per se to a person skilled in the art.
  • UV-A light has a wavelength of 380 to 315 nm.
  • the surface to be examined is irradiated with UV-C light.
  • UV-C light is known per se to the person skilled in the art.
  • UV-C light has a wavelength of 10 to 280 nm.
  • Suitable radiation sources for UV light, in particular UV-A light are known to the person skilled in the art, for example UV LEDs, in particular UV-A LEDs or standard UV lamps, in particular standard UV lamps.
  • the surface to be examined is irradiated with UV light and the radiation reflected or emitted by the surface is then detected by means of at least one sensor over the entire width of the surface.
  • light is detected in the range from 300 to 600 nm with the sensor.
  • Suitable sensors are known per se to those skilled in the art, for example photosensors.
  • a camera is preferably used.
  • the present invention therefore preferably relates to the method according to the invention, wherein a camera is used as at least one sensor. The method according to the invention can therefore be realized particularly easily.
  • the reflected radiation means the part of the radiation applied to the surface, which is reflected by the medium present on the surface or by the surface.
  • the emitted radiation is understood to mean the radiation which is emitted by the medium present on the surface or by the surface after excitation by irradiation with UV light.
  • This emission is preferably fluorescence according to the invention. Fluorescence is known per se to the person skilled in the art. The fluorescence is excited by irradiation of the medium present on the surface, for example of the oil, with UV light. If this UV light strikes a medium, for example oil, depending on the medium and the amount of medium applied, part of the emitted UV light is absorbed and emitted again as fluorescence.
  • a sensor is used, which can simultaneously measure reflected and emitted radiation.
  • two sensors can also be used, one of which can detect the reflected radiation and the second the emitted radiation.
  • the detection of the radiation reflected or emitted by the surface of the strip by the at least one sensor is preferably followed by an evaluation of the data obtained.
  • the present invention therefore preferably relates to the method according to the invention, wherein an evaluation is followed by the detection of the radiation reflected by the surface.
  • Methods for the evaluation of corresponding data are known to the person skilled in the art and are preferably carried out with a corresponding evaluation software. Is determined by the inventive method that the degree of wetting on the surface of the tape is not sufficient, i.
  • a further process step may be initiated, for example stopping the belt and oiling in order to be able to correct the error that has occurred; For example, by flushing the Olmaschine, in particular the oil beam in the Olmaschine an improvement, ie an increased degree of wetting without dry spots can be obtained.
  • the UV light source and the at least one sensor are fixedly attached to one another and to the moving belt.
  • "stationary to one another and to the moving belt” means that the UV light source and at least one sensor are mounted such that the UV light source and at least one sensor are arranged statically, and the belt moves past them,
  • This feature according to the invention has the advantage that the detection with a static measuring arrangement is simpler and more accurate.
  • the at least one sensor and the UV light source is mounted on a support which is arranged to the moving belt, that the tape can move freely and it is simultaneously possible that the entire width of the tape through irradiated the UV light source and can be observed with the at least one sensor.
  • Methods of attaching the UV light source and the at least one sensor to a support and attaching it to the moving belt according to the present invention are known to those skilled in the art.
  • the UV light source and the at least one sensor more preferably on a common carrier, in the immediate vicinity of the Olmaschine, preferably mounted directly in the Olmaschine, so that the inventive method directly after the application of the medium, in particular the B ⁇ L , can be done.
  • the inventive method is carried out so that a protective housing against extraneous light is present around the UV light source and the at least one sensor.
  • This preferred embodiment has the advantage that the measurement accuracy is significantly increased by the absence of extraneous light.
  • Another advantage of the method according to the invention is that it can be carried out in comparison with the methods known from the prior art with significantly less effort and therefore is considerably less expensive.
  • the present invention also relates to a device for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material comprising a UV light source which irradiates the entire width of the belt and at least one sensor which detects the entire width of the surface the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt. Details and preferred embodiments of the device according to the invention have already been mentioned with respect to the method according to the invention and apply here accordingly.
  • the device according to the invention is preferably mounted in the immediate vicinity of, for example, after the oil machine, or directly in an oil machine known to those skilled in the art.
  • the present invention therefore preferably relates to the device according to the invention, wherein it is in close proximity to, for example, after the oil machine, or mounted directly in an oil machine.
  • the present invention also relates to the use of the device according to the invention for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material. Details and preferred embodiments of the use according to the invention have already been mentioned with respect to the method according to the invention and apply here accordingly.
  • the method according to the invention and the device according to the invention can advantageously be used in quality control in the coating of steel strips and in the deformation of oiled steel strips.
  • FIG. 1 shows a preferred device according to the invention for carrying out the method according to the invention.
  • the reference numerals have the following meanings:

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  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The invention relates to a method for detecting the wetting degree of the surface of a strip (5) moved in the longitudinal direction (1) and to a corresponding device. The surface of the strip (5) is irradiated by a UV light source (2), over the entire width of the strip, and the light emitted by or reflected on the surface is measured by means of at least one sensor (3) over the entire width. The method and the device are used to determine a wetting degree of steel strips by oil.

Description

Erkennung von trockenen Fehlstellen auf beölten Stahlbändern mittels UV-Licht Technisches Gebiet  Detection of dry defects on oiled steel strips using UV light Technical Field
Die vorliegende Erfindung betrifft ein Verfahren zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material durch Bestrahlen der zu untersuchenden Oberfläche über ihre gesamte Breite mit UV-Licht und Detektion der von der Oberfläche reflektierten Strahlung mittels eines Sensors über die gesamte Breite der Oberfläche, wobei die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind, eine entsprechende Vorrichtung und die Verwendung dieser Vorrichtung. The present invention relates to a method for detecting the degree of wetting of the surface of a longitudinally moving strip of at least one material by irradiating the surface to be examined over its entire width with UV light and detecting the radiation reflected from the surface by means of a sensor over the entire width the surface, wherein the UV light source and the at least one sensor are mounted stationary to each other and to the moving belt, a corresponding device and the use of this device.
Es ist bekannt, Stahlbänder nach ihrer Herstellung und bevor sie zu einem sogenannten Coil aufgewickelt werden, einzuölen. Dies geschieht im Allgemeinen, indem die Stahlbänder kurz vor dem Aufwickeln auf der Ober- und Unterseite durch zwei Düsenbalken kontinuierlich mit Öl besprüht werden. Als zusätzlicher Korrosionsschutz wirkt die BeÖlung bevorzugt der vorzeitigen Alterung des Materials entgegen und kann in der weiteren Verarbeitung als Verformungshilfe beim Umformen zu entsprechenden Bauteilen hilfreich sein . Die Menge an Öl auf dem Stahlband liegt im Allgemeinen bei 0,3 bis 2,0 g/m2. Dabei ist es gewünscht, dass der Ölfilm sowohl über die gesamte Bandlänge und -breite vollständig ist, d. h. ein möglichst hoher Benetzungsgrad vorliegt und es keine trockenen Stellen gibt. Des Weiteren soll der Ölfilm möglichst gleichmäßig, d. h . in möglichst gleicher Dicke, aufgetragen werden. Außerdem ist es zu vermeiden, dass zu viel Öl auf das Band aufgetragen wird. Diese so genannte Überölung kann beispielsweise durch das Sprühverfahren in den Ölmaschinen erfolgen , insbesondere sind Überölungen in den Randbereichen des Bandes möglich. It is known to oil steel strips after their manufacture and before they are wound into a so-called coil. This is generally done by spraying the steel strips continuously with oil just before winding on the top and bottom through two nozzle bars. As an additional corrosion protection, the coating preferably counteracts the premature aging of the material and may be helpful in further processing as a deformation aid during forming into corresponding components. The amount of oil on the steel strip is generally 0.3 to 2.0 g / m 2 . It is desirable that the oil film is complete over the entire length and width of the strip, ie the highest possible degree of wetting is present and there are no dry spots. Furthermore, the oil film as evenly as possible, d. H . in the same thickness as possible, are applied. It is also important to avoid putting too much oil on the belt. This so-called over-oiling can be done for example by the spray process in the oil machines, in particular over-oiling in the edge regions of the belt are possible.
Verfahren zur Überwachung einer solchen Ölschicht sind aus dem Stand der Technik bekannt. In der DE 10 2008 050 598 AI wird ein System zur Detektion von Medien , beispielsweise Öl, auf Oberflächen offenbart. Dazu wird die Oberfläche mit Strahlung aus einer Strahlungsquelle bestrahlt. Die reflektierte Strahlung wird dann mit einem Sensor detektiert und ausgewertet, um so die Benetzung auf der Oberfläche feststellen zu können . Strahlungsquelle und Sensor sind in diesem Verfahren beweglich angeordnet, damit sie während der Messung über die Oberfläche traversieren, da eine vollständige Erfassung der gesamten Fläche mit diesem Verfahren nicht möglich ist. Methods for monitoring such an oil layer are known in the art. DE 10 2008 050 598 A1 discloses a system for detecting media, for example oil, on surfaces. For this purpose, the surface is irradiated with radiation from a radiation source. The reflected radiation is then detected by a sensor and evaluated, so as to be able to determine the wetting on the surface. Radiation source and sensor are movably arranged in this process, so that they traverse over the surface during the measurement, since a complete detection of the entire surface with this method is not possible.
Bei dem Fachmann bekannten Ölmaschinen ist es möglich, dass auf der Oberfläche trockene, d.h . ölfreie, Streifen oder Bereiche verbleiben . Des Weiteren können sich von vorangegangenen Arbeitsschritten Rest- Emulsionen (Wasser-Ölgemische) auf der Oberfläche befinden, die zu unerwünschten Unregelmäßigkeiten in der Ölauflage führen. Bei derartigen Unregelmäßigkeiten , d.h. bei ölfreien Stellen oder unregelmäßig benetzten Stellen , handelt es sich um Prozessfehler. Derartige Prozessfehler mindern die Qualität der zu verarbeitenden Oberfläche und sind daher zu vermeiden. In oil machines known to those skilled in the art, it is possible that on the surface dry, i. oil-free, stripes or areas remain. Furthermore, residual emulsions (water-oil mixtures) may be present on the surface from previous work steps, which lead to undesirable irregularities in the oil layer. In such irregularities, i. in oil-free areas or irregularly wetted areas, it is a process error. Such process errors reduce the quality of the surface to be processed and should therefore be avoided.
Die vorliegende Erfindung hat daher die Aufgabe, ein Verfahren bereitzustellen , mit dem der Benetzungsgrad der Oberfläche eines Bandes, insbesondere eines Stahlbandes, detektiert werden kann , um so erkennen zu können, ob auf der Oberfläche ein ausreichender Film aus einem Medium, insbesondere ein Ölfilm, vorliegt. Dabei soll es möglich sein, einen Ausschnitt eines Bandes über die gesamte Breite kontinuierlich beobachten zu können, damit möglichst schnell die entsprechenden Informationen zugänglich sind. Weiterhin soll es möglich sein, dass das Verfahren direkt in einer dem Fachmann bekannten Ölmaschine durchgeführt werden kann . The present invention therefore has for its object to provide a method with which the degree of wetting of the surface of a strip, in particular a steel strip, can be detected so as to be able to detect whether a sufficient film of a medium, in particular an oil film, is present on the surface. is present. It should be possible to be able to continuously observe a section of a band across the entire width, so that the corresponding information is accessible as quickly as possible. Furthermore, it should be possible for the process to be carried out directly in an oil machine known to the person skilled in the art.
Diese Aufgaben werden durch das erfindungsgemäße Verfahren gelöst. Des Weiteren werden die Aufgaben durch eine entsprechende erfindungsgemäße Vorrichtung und durch die erfindungsgemäße Verwendung gelöst. These objects are achieved by the method according to the invention. Furthermore, the objects are achieved by a corresponding device according to the invention and by the use according to the invention.
Die vorliegende Erfindung betrifft daher ein Verfahren zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material durch Bestrahlen der zu untersuchenden Oberfläche über ihre gesamte Breite mit UV-Licht und Detektion der von der Oberfläche reflektierten Strahlung mittels wenigstens eines Sensors über die gesamte Breite der Oberfläche, wobei die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. The present invention therefore relates to a method for detecting the degree of wetting of the surface of a longitudinally moving strip of at least one material by irradiating the surface to be examined over its entire width with UV light and detecting the radiation reflected from the surface via at least one sensor entire width of the surface, wherein the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt.
Erfindungswesentlich ist, dass die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. Diese erfindungsgemäßen Merkmale ergeben die Vorteile, dass das sich in Längsrichtung bewegende Band kontinuierlich und über die gesamte Breite beobachtet werden kann . Zum einen wird dadurch die Geschwindigkeit des erfindungsgemäßen Verfahrens gegenüber Verfahren des Standes der Technik deutlich erhöht. Des Weiteren entfällt bei dem erfindungsgemäßen Verfahren der Schritt, in dem aus mehreren Einzelbildern ein Bild der Oberfläche über die gesamte Breite erstellt werden muss, so dass es weniger fehleranfällig ist. Des Weiteren liegen im Vergleich zum Stand der Technik weniger bewegte Bauteile vor, so dass insgesamt der Wartungsaufwand und das Unfallrisiko deutlich reduziert sind. Erfindungsgemäß bevorzugt wird das sich in Längsrichtung bewegende Band über die gesamte Breite mit der UV-Lichtquelle beschienen, und der Sensor detektiert über die gesamte Breite des Bands die reflektierte Strahlung im sichtbaren Bereich. Im Vergleich zu den aus dem Stand der Technik bekannten Verfahren, in denen sich ein Sensor traversierend über das sich bewegende Band bewegt, kann somit erfindungsgemäß das Band zu einem Zeitpunkt über die gesamte Breite und jede einzelne Stelle des Bands durch den Sensor beobachtet werden. Bei einer traversierenden Bewegung kann immer nur ein Ausschnitt des Bands durch den Sensor beobachtet werden . Beispielsweise betragen die Traversiergeschwindigkeiten bei Vorrichtungen gemäß Stand der Technik 250 bis 500 mm/s, d.h. , dass sich bei einer üblichen Bandgeschwindigkeit von 120 m/min und einer Bandbreite von 2000 mm 16 bis 32 m des Bands unter dem Sensor wegbewegen bis dieser wieder an der gleichen Position ist, so dass ein Großteil des Bands durch den Sensor nicht erfasst wird. Essential to the invention is that the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt. These features of the present invention provide the advantages that the belt moving in the longitudinal direction can be observed continuously and over the entire width. On the one hand, this significantly increases the speed of the method according to the invention over prior art methods. Furthermore, the method according to the invention eliminates the step in which an image of the surface over the entire width must be created from a plurality of individual images, so that it is less prone to error. Furthermore, in comparison to the prior art less moving components are present, so that overall the maintenance costs and the accident risk are significantly reduced. According to the invention, the band moving in the longitudinal direction is irradiated over the entire width with the UV light source, and the sensor detects the reflected radiation in the visible range over the entire width of the band. Thus, in comparison with prior art methods in which a sensor moves traversingly over the moving belt, the belt can be observed by the sensor at one time across the entire width and at each point of the belt. In a traversing motion, only a section of the tape can ever be observed by the sensor. For example, the traverse speeds in prior art devices are 250 to 500 mm / s, i. in that at a standard belt speed of 120 m / min and a belt width of 2000 mm, 16 to 32 m of the belt move under the sensor until it is in the same position again, so that most of the belt is not detected by the sensor.
Durch das erfindungsgemäße Verfahren wird der Benetzungsgrad eines in Längsrichtung bewegten Bandes aus wenigstens einem Material bestimmt. Erfindungsgemäß bevorzugt handelt es sich bei dem wenigstens einem Material um metallische Oberflächen wie Stahl, Aluminium, Kupferlegierungen oder Edelstahl. Bevorzugt ist das Material Stahl, d. h . erfindungsgemäß wird bevorzugt die Oberfläche eines Stahlflachproduktes, insbesondere eines Stahlbandes, bestimmt. Die vorliegende Erfindung betrifft daher bevorzugt das erfindungsgemäße Verfahren, wobei es sich bei dem Band aus wenigstens einem Material um ein Stahlflachprodukt, weiter bevorzugt ein Stahlband, handelt. By the method according to the invention, the degree of wetting of a belt moved in the longitudinal direction is determined from at least one material. According to the invention, the at least one material is preferably metallic surfaces such as steel, aluminum, copper alloys or stainless steel. Preferably, the material is steel, d. H . According to the invention, the surface of a flat steel product, in particular a steel strip, is preferably determined. The present invention therefore preferably relates to the method according to the invention, wherein the strip of at least one material is a flat steel product, more preferably a steel strip.
Die Abmessungen des zu untersuchenden Bandes sind erfindungsgemäß nicht kritisch . Erfindungsgemäß bevorzugt betragen die Breite des Bandes 550 bis 2200 mm und die Dicke des Bandes 0,4 bis 4,0 mm Die vorliegende Erfindung betrifft daher bevorzugt das erfindungsgemäße Verfahren , wobei die Breite des Bandes 550 bis 2200 mm und die Dicke des Bandes 0,4. bis 4 mm betragen. Die Länge des Bandes beträgt beispielsweise 100 bis 7000 m. Dabei ist zu beachten , dass das erfindungsgemäße Verfahren bevorzugt kontinuierlich durchgeführt wird, d. h . ein sehr langes Band wird in Längsrichtung bewegt, während das erfindungsgemäße Verfahren durchgeführt wird. Daher wird mit dem erfindungsgemäßen Verfahren bevorzugt nur ein Ausschnitt der Gesamtlänge des Bandes beobachtet. The dimensions of the band to be examined according to the invention are not critical. According to the invention, the width of the tape is preferably 550 to 2200 mm and the thickness of the tape 0.4 to 4.0 mm. The present invention therefore preferably relates to the method according to the invention, wherein the width of the tape is 550 to 2200 mm and the thickness of the tape is 0, 4th to 4 mm. The length of the band is for example 100 to 7000 m. It should be noted that the inventive method is preferably carried out continuously, d. H . a very long belt is moved in the longitudinal direction while the process according to the invention is carried out. Therefore, preferably only a section of the total length of the strip is observed with the method according to the invention.
Durch das erfindungsgemäße Verfahren ist es weiter bevorzugt auch möglich, Ober- und Unterseite eines benetzten Bandes gleichzeitig zu beobachten, wobei in dieser Ausführungsformen an der Ober- und an der Unterseite jeweils eine entsprechende erfindungsgemäße Vorrichtung angebracht sein muss. By means of the method according to the invention, it is further preferably also possible to simultaneously observe the top and bottom of a wetted band, wherein in these embodiments a respective device according to the invention must be attached to the top and bottom sides.
Das bewegte Band, welches erfindungsgemäß beobachtet wird, ist in einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens durch entsprechende, dem Fachmann bekannte Verfahren erhalten worden , beispielsweise Warm- und/oder Kaltwalzen . Das erfindungsgemäße Verfahren wird bevorzugt nach dem Beölen der Oberfläche des Stahlbandes durchgeführt. Ganz besonders bevorzugt erfolgt das erfindungsgemäße Verfahren in einer dem Fachmann bekannten Ölmaschine direkt nach dem Beölen des Stahlbandes. The moving belt, which is observed according to the invention, has been obtained in a preferred embodiment of the process according to the invention by appropriate methods known to the person skilled in the art, for example hot and / or cold rolling. The process of the invention is preferably carried out after oiling the surface of the steel strip. The process according to the invention very particularly preferably takes place in an oil machine known to the person skilled in the art directly after the oiling of the steel strip.
Erfindungsgemäß ist der Benetzungsgrad der Oberfläche definiert als das Verhältnis von unbenetzter Oberfläche des Bandes zu gesamter zu untersuchter Oberfläche des Bandes. Erfindungsgemäß bevorzugt wird somit detektiert, ob die zu untersuchende Oberfläche vollständig mit einem Medium bedeckt ist. Eine vollständige Bedeckung der Oberfläche mit dem Öl entspricht einem Benetzungsgrad von 1. Liegen auf der Oberfläche Stellen vor, die nicht mit dem Medium bedeckt sind, so liegt der Benetzungsgrad unter 1. Benetzungs- grade von unter 1 sind unerwünscht und sollen durch das erfindungsgemäße Verfahren detektiert werden. According to the invention, the degree of wetting of the surface is defined as the ratio of unwetted surface of the tape to the entire surface of the tape to be examined. According to the invention, it is thus preferably detected whether the surface to be examined is completely covered with a medium. Complete coverage of the surface with the oil corresponds to a degree of wetting of 1. If there are sites on the surface which are not covered with the medium, the degree of wetting is less than 1. Wetting degrees of less than 1 are undesirable and should be achieved by the process according to the invention be detected.
Durch das erfindungsgemäße Verfahren kann/können entweder nur die Oberseite des bewegten Bands, oder nur die Unterseite des bewegten Bands oder beide, Ober- und Unterseite des bewegten Bands, beobachtet werden. Bei gleichzeitiger Beobachtung der Ober- und Unterseite kann weiter bevorzugt ein Vergleich der detektierten Werte erfolgen. Der Fachmann bezeichnet Stellen auf der Oberfläche, die nicht vollständig mit dem Medium, insbesondere einem Öl, benetzt sind, als sogenannte trockene Stellen. Das erfindungsgemäße Verfahren dient bevorzugt dazu, trockene Stellen , d.h. nicht vollständig benetzte Stellen, auf der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material zu detektieren. By the method according to the invention, either only the upper side of the moving belt, or only the underside of the moving belt or both top and bottom of the moving belt, can be observed. With simultaneous observation of the top and bottom, a comparison of the detected values can be carried out more preferably. The skilled person refers to sites on the surface that are not completely wetted with the medium, in particular an oil, as so-called dry spots. The process of the invention preferably serves to prevent dry spots, i. incompletely wetted sites, on the surface of a longitudinally moving belt of at least one material to detect.
Die vorliegende Erfindung betrifft daher bevorzugt das erfindungsgemäße Verfahren, wobei trockene Stellen, d.h. nicht vollständig benetzte Stellen, auf der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material detektiert werden. The present invention therefore preferably relates to the process of the invention wherein dry spots, i. incompletely wetted sites are detected on the surface of a longitudinally moving belt of at least one material.
Es ist erfindungsgemäß auch möglich, dass durch das erfindungsgemäße Verfahren die Schichtdicke des Mediums bestimmt wird, beispielsweise kann das detektierte Bild des Mediumfilms, insbesondere des Ölfilms, mit einer geeigneten Software ausgewertet werden, so dass die detektierten Grau- bzw. Farbwerte einen Rückschluss auf die Schichtdicke zulassen. Erfindungsgemäß bevorzugt wird dazu das durch den Sensor detektierte Licht im sichtbaren Bereich in entsprechende Grauwerte umgewandelt. Durch diese Grauwerte kann dann bestimmt werden, wie vollständig bzw. stark die Benetzung des Bands ist. Die Umrechnung des durch den Sensor detektierten Signals in entsprechende Grauwerte kann durch dem Fachmann bekannte Verfahren erfolgen. Dabei entsprechen niedrige Grauwerte einer niedrigen Benetzung durch das Medium, hohe Grauwerte entsprechen einer hohen Benetzung durch das Medium. It is according to the invention also possible that the layer thickness of the medium is determined by the inventive method, for example, the detected image of the medium film, in particular the oil film, be evaluated with a suitable software, so that the detected gray or color values inference to the Allow layer thickness. Preferably, according to the invention, the light detected by the sensor is converted in the visible range into corresponding gray values. These gray values can then be used to determine how complete or strong the wetting of the tape is. The conversion of the signal detected by the sensor into corresponding gray values can be carried out by methods known to the person skilled in the art respectively. Low gray values correspond to low wetting by the medium, high gray values correspond to high wetting by the medium.
Erfindungsgemäß bevorzugt wird unter einem Medium eine Flüssigkeit verstanden, die als Film auf die Oberfläche des Bandes aufgebracht wird. Die Filmdicke beträgt dabei bevorzugt 0,30 μηι bis 2,5 μηι, besonders bevorzugt 0,33 μηι bis 2,2 μηι. Erfindungsgemäß bevorzugte Medien sind beispielsweise ausgewählt aus hydrophoben Medien, beispielsweise Ölen , oder wässrigen Zusammensetzungen, beispielsweise Emulsionen. Bevorzugt ist das auf der Oberfläche vorhandene Medium ein hydrophobes Medium, bevorzugt ein Öl. According to the invention, a medium is preferably understood as meaning a liquid which is applied as a film to the surface of the strip. The film thickness is preferably 0.30 μηι to 2.5 μηι, more preferably 0.33 μηι to 2.2 μηι. Preferred media according to the invention are selected, for example, from hydrophobic media, for example oils, or aqueous compositions, for example emulsions. Preferably, the medium present on the surface is a hydrophobic medium, preferably an oil.
Die vorliegende Erfindung betrifft daher bevorzugt das erfindungsgemäße Verfahren, wobei die Oberfläche mit einem hydrophoben Medium, bevorzugt einem Öl, benetzt ist. The present invention therefore preferably relates to the process according to the invention, wherein the surface is wetted with a hydrophobic medium, preferably an oil.
Die Menge an Medium, vorzugsweise Öl, die der Oberfläche vorliegt, ist erfindungsgemäß nicht beschränkt, bevorzugt liegen 0,3 bis 2 g/m2 des Mediums, bevorzugt des Öls, auf der Oberfläche vor. The amount of medium, preferably oil, which is present on the surface is not limited according to the invention, preferably 0.3 to 2 g / m 2 of the medium, preferably of the oil, is present on the surface.
Erfindungsgemäß wird die zu untersuchende Oberfläche über ihre gesamte Breite mit UV-Licht bestrahlt. Weiter bevorzugt wird die gesamte Breite des Bandes möglichst gleichmäßig mit UV-Licht bestrahlt, d.h. bevorzugt unterscheidet sich die Intensität des UV-Lichts in einzelnen Abschnitten der Breite des Bandes um nicht mehr als 5% bezüglich des Maximalwertes der Intensität während der Messung. According to the invention, the surface to be examined is irradiated over its entire width with UV light. More preferably, the entire width of the tape is irradiated as uniformly as possible with UV light, i. Preferably, the intensity of the UV light differs in individual sections of the width of the belt by no more than 5% with respect to the maximum value of the intensity during the measurement.
Erfindungsgemäß wird die zu untersuchende Oberfläche mit UV-Licht, insbesondere mit UV-A-Licht, UV-B-Licht oder UV-C-Licht, bestrahlt. Die vorliegende Erfindung betrifft bevorzugt das erfindungsgemäße Verfahren, wobei die zu untersuchende Oberfläche mit UV-A-Licht bestrahlt wird. Die erfindungsgemäß bevorzugte Strahlungsart UV-A-Licht ist dem Fachmann an sich bekannt. UV-A-Licht weist eine Wellenlänge von 380 bis 315 nm auf. In einer weiteren bevorzugten Ausführungsform wird die zu untersuchende Oberfläche mit UV-C- Licht bestrahlt. UV-C-Licht ist dem Fachmann an sich bekannt. UV-C-Licht weist eine Wellenlänge von 10 bis 280 nm auf. Geeignete Strahlungsquellen für UV-Licht, insbesondere UV-A-Licht, sind dem Fachmann bekannt, beispielsweise UV-LED, insbesondere UV-A-LED oder Standard-UV-Lampen, insbesondere Standard-UV-ALampen . According to the invention, the surface to be examined is irradiated with UV light, in particular with UV-A light, UV-B light or UV-C light. The present invention preferably relates to the method according to the invention, wherein the surface to be examined is irradiated with UV-A light. The preferred type of radiation UV-A light according to the invention is known per se to a person skilled in the art. UV-A light has a wavelength of 380 to 315 nm. In a further preferred embodiment, the surface to be examined is irradiated with UV-C light. UV-C light is known per se to the person skilled in the art. UV-C light has a wavelength of 10 to 280 nm. Suitable radiation sources for UV light, in particular UV-A light, are known to the person skilled in the art, for example UV LEDs, in particular UV-A LEDs or standard UV lamps, in particular standard UV lamps.
Erfindungsgemäß wird die zu untersuchende Oberfläche mit UV-Licht bestrahlt und die von der Oberfläche reflektierte oder emittierte Strahlung wird dann mittels wenigstens eines Sensors über die gesamte Breite der Oberfläche detektiert. Erfindungsgemäß bevorzugt wird mit dem Sensor Licht im Bereich von 300 bis 600 nm, detektiert. Geeignete Sensoren sind dem Fachmann an sich bekannt, beispielsweise Fotosensoren . Erfindungsgemäß bevorzugt wird eine Kamera eingesetzt. Die vorliegende Erfindung betrifft daher bevorzugt das erfindungsgemäße Verfahren, wobei als wenigstens ein Sensor eine Kamera eingesetzt wird. Das erfindungsgemäße Verfahren kann daher besonders einfach realisiert werden. According to the invention, the surface to be examined is irradiated with UV light and the radiation reflected or emitted by the surface is then detected by means of at least one sensor over the entire width of the surface. According to the invention, light is detected in the range from 300 to 600 nm with the sensor. Suitable sensors are known per se to those skilled in the art, for example photosensors. According to the invention, a camera is preferably used. The present invention therefore preferably relates to the method according to the invention, wherein a camera is used as at least one sensor. The method according to the invention can therefore be realized particularly easily.
Unter der reflektierten Strahlung wird erfindungsgemäß der Teil der auf die Oberfläche aufgebrachten Strahlung verstanden, die von dem auf der Oberfläche vorhandenen Medium oder von der Oberfläche reflektiert wird. Unter der emittierten Strahlung wird erfindungsgemäß die Strahlung verstanden, die von dem auf der Oberfläche vorhandenen Medium oder von der Oberfläche nach Anregung durch Bestrahlen mit UV-Licht emittiert wird. Bei dieser Emission handelt es sich erfindungsgemäß bevorzugt um Fluoreszenz. Fluoreszenz ist dem Fachmann an sich bekannt. Die Fluoreszenz wird durch Bestrahlung des auf der Oberfläche vorhandenen Mediums, beispielsweise des Öls, mit UV-Licht angeregt. Trifft dieses UV-Licht auf ein Medium, beispielsweise Öl, so wird in Abhängigkeit von dem Medium sowie der Menge des aufgetragenen Mediums, ein Teil des ausgestrahlten UV-Lichtes absorbiert und als Fluoreszenz wieder emittiert. Somit wird in dem erfindungsgemäßen Verfahren bevorzugt ein Sensor eingesetzt, der gleichzeitig reflektierte und emittierte Strahlung messen kann. Erfindungsgemäß können auch zwei Sensoren eingesetzt werden, wobei einer die reflektierte und der zweite die emittierte Strahlung detektieren kann. According to the invention, the reflected radiation means the part of the radiation applied to the surface, which is reflected by the medium present on the surface or by the surface. According to the invention, the emitted radiation is understood to mean the radiation which is emitted by the medium present on the surface or by the surface after excitation by irradiation with UV light. This emission is preferably fluorescence according to the invention. Fluorescence is known per se to the person skilled in the art. The fluorescence is excited by irradiation of the medium present on the surface, for example of the oil, with UV light. If this UV light strikes a medium, for example oil, depending on the medium and the amount of medium applied, part of the emitted UV light is absorbed and emitted again as fluorescence. Thus, in the method according to the invention preferably a sensor is used, which can simultaneously measure reflected and emitted radiation. According to the invention, two sensors can also be used, one of which can detect the reflected radiation and the second the emitted radiation.
An die Detektion der von der Oberfläche des Bandes reflektierten oder emittierten Strahlung durch den wenigstens einen Sensor schließt sich erfindungsgemäß bevorzugt einen Auswertung der erhaltenen Daten an . Bevorzugt betrifft die vorliegende Erfindung daher das erfindungsgemäße Verfahren , wobei sich an die Detektion der von der Oberfläche reflektierten Strahlung eine Auswertung anschließt. Verfahren zur Auswertung entsprechender Daten sind dem Fachmann bekannt und werden bevorzugt mit einer entsprechenden Auswertesoftware durchgeführt. Wird durch erfindungsgemäße Verfahren ermittelt, dass der Benetzungsgrad auf der Oberfläche des Bandes nicht ausreicht, d.h . unter einem bestimmten vorher festzulegenden Wert liegt, beispielsweise mindestens 0,90, bevorzugt mindestens 0,93 , weiter bevorzugt mindestens 0,97 , kann ein weiterer Verfahrensschritt eingeleitet werden , beispielsweise Anhalten des Bandes und des Beölens, um den aufgetretenen Fehler korrigieren zu können ,, beispielsweise kann durch Spülen der Olmaschine, insbesondere des Öl-Balkens in der Olmaschine eine Verbesserung, d.h. ein erhöhter Benetzungsgrad ohne trockene Stellen, erhalten werden. The detection of the radiation reflected or emitted by the surface of the strip by the at least one sensor is preferably followed by an evaluation of the data obtained. The present invention therefore preferably relates to the method according to the invention, wherein an evaluation is followed by the detection of the radiation reflected by the surface. Methods for the evaluation of corresponding data are known to the person skilled in the art and are preferably carried out with a corresponding evaluation software. Is determined by the inventive method that the degree of wetting on the surface of the tape is not sufficient, i. is below a certain predetermined value, for example at least 0.90, preferably at least 0.93, more preferably at least 0.97, a further process step may be initiated, for example stopping the belt and oiling in order to be able to correct the error that has occurred; For example, by flushing the Olmaschine, in particular the oil beam in the Olmaschine an improvement, ie an increased degree of wetting without dry spots can be obtained.
Erfindungswesentlich ist des Weiteren, dass die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. Im Rahmen der vorliegenden Erfindung bedeutet„ortsfest zu einander und zu dem bewegten Band", dass UV-Lichtquelle und wenigstens ein Sensor so angebracht sind, dass UV-Lichtquelle und wenigstens ein Sensor statisch angeordnet sind, und das Band sich an diesen vorbei bewegt, sich bevorzugt unter ihnen hinweg bewegt. Dieses erfindungsgemäße Merkmal ergibt den Vorteil, dass die Detektion mit einer statischen Messanordnung einfacher und genauer möglich ist. It is furthermore essential to the invention that the UV light source and the at least one sensor are fixedly attached to one another and to the moving belt. In the context of the present invention, "stationary to one another and to the moving belt" means that the UV light source and at least one sensor are mounted such that the UV light source and at least one sensor are arranged statically, and the belt moves past them, This feature according to the invention has the advantage that the detection with a static measuring arrangement is simpler and more accurate.
Dabei ist es bevorzugt, dass der wenigstens ein Sensor und die UV-Lichtquelle auf einem Träger angebracht wird, der so zu dem bewegten Band angeordnet wird, dass sich das Band frei bewegen kann und es gleichzeitig möglich ist, dass die gesamte Breite des Bandes durch die UV-Lichtquelle bestrahlt und mit dem wenigstens einen Sensor beobachtet werden kann. Methoden, die UV-Lichtquelle und den wenigstens einen Sensor auf einem Träger zu befestigen und entsprechend der vorliegenden Erfindung bezüglich des bewegten Bandes anzubringen, sind dem Fachmann bekannt. Bevorzugt werden die UV-Lichtquelle und der wenigstens eine Sensor, weiter bevorzugt auf einem gemeinsamen Träger, in unmittelbarer Nähe zu der Olmaschine, bevorzugt direkt in der Olmaschine, angebracht, damit das erfindungsgemäße Verfahren direkt im Anschluss an das Aufbringen des Mediums, insbesondere der BeÖlung, erfolgen kann. It is preferred that the at least one sensor and the UV light source is mounted on a support which is arranged to the moving belt, that the tape can move freely and it is simultaneously possible that the entire width of the tape through irradiated the UV light source and can be observed with the at least one sensor. Methods of attaching the UV light source and the at least one sensor to a support and attaching it to the moving belt according to the present invention are known to those skilled in the art. Preferably, the UV light source and the at least one sensor, more preferably on a common carrier, in the immediate vicinity of the Olmaschine, preferably mounted directly in the Olmaschine, so that the inventive method directly after the application of the medium, in particular the BÖL , can be done.
Weiter bevorzugt wird das erfindungsgemäße Verfahren so durchgeführt, dass um die UV-Lichtquelle und den wenigstens einen Sensor ein Schutzgehäuse gegen Fremdlicht vorhanden ist. Diese bevorzugte Ausführungsform hat den Vorteil, dass die Messgenauigkeit durch Abwesenheit von Fremdlicht deutlich erhöht wird. Ein weiterer Vorteil des erfindungsgemäßen Verfahrens ist, dass es im Vergleich mit den aus dem Stand der Technik bekannten Verfahren mit deutlich weniger Aufwand durchgeführt werden kann und daher erheblich kostengünstiger ist. Die vorliegende Erfindung betrifft auch eine Vorrichtung zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material, umfassend eine UV- Lichtquelle, die die gesamte Breite des Bandes bestrahlt und wenigstens einen Sensor, der die gesamte Breite der Oberfläche detektiert, wobei die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. Details und bevorzugte Ausführungsformen der erfindungsgemäßen Vorrichtung sind bereits bezüglich des erfindungsgemäßen Verfahrens genannt worden und gelten hier entsprechend. More preferably, the inventive method is carried out so that a protective housing against extraneous light is present around the UV light source and the at least one sensor. This preferred embodiment has the advantage that the measurement accuracy is significantly increased by the absence of extraneous light. Another advantage of the method according to the invention is that it can be carried out in comparison with the methods known from the prior art with significantly less effort and therefore is considerably less expensive. The present invention also relates to a device for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material comprising a UV light source which irradiates the entire width of the belt and at least one sensor which detects the entire width of the surface the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt. Details and preferred embodiments of the device according to the invention have already been mentioned with respect to the method according to the invention and apply here accordingly.
Die erfindungsgemäße Vorrichtung wird bevorzugt in unmittelbarer Nähe zu, beispielsweise nach der Öl- maschine, oder direkt in einer dem Fachmann bekannten Ölmaschine angebracht. Die vorliegende Erfindung betrifft daher bevorzugt die erfindungsgemäße Vorrichtung, wobei diese in unmittelbarer Nähe zu, beispielsweise nach der Ölmaschine, oder direkt in einer Ölmaschine angebracht ist. The device according to the invention is preferably mounted in the immediate vicinity of, for example, after the oil machine, or directly in an oil machine known to those skilled in the art. The present invention therefore preferably relates to the device according to the invention, wherein it is in close proximity to, for example, after the oil machine, or mounted directly in an oil machine.
Die vorliegende Erfindung betrifft auch die Verwendung der erfindungsgemäßen Vorrichtung zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material. Details und bevorzugte Ausführungsformen der erfindungsgemäßen Verwendung sind bereits bezüglich des erfindungsgemäßen Verfahrens genannt worden und gelten hier entsprechend. The present invention also relates to the use of the device according to the invention for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material. Details and preferred embodiments of the use according to the invention have already been mentioned with respect to the method according to the invention and apply here accordingly.
Gewerbliche Anwendbarkeit Industrial Applicability
Das erfindungsgemäße Verfahren und die erfindungsgemäße Vorrichtung können vorteilhaft in der Qualitätskontrolle bei der BeÖlung von Stahlbändern und bei der Verformung von beölten Stahlbändern eingesetzt werden. The method according to the invention and the device according to the invention can advantageously be used in quality control in the coating of steel strips and in the deformation of oiled steel strips.
Figuren characters
In Figur 1 ist eine bevorzugte erfindungsgemäße Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens abgebildet. Dabei haben die Bezugszeichen die folgenden Bedeutungen : FIG. 1 shows a preferred device according to the invention for carrying out the method according to the invention. The reference numerals have the following meanings:
1 Richtung des Bandlaufs 1 direction of tape run
2 UV-Flächenpaneel  2 UV surface panels
3 Kamera mit UV-Sensor  3 camera with UV sensor
4 Schutzgehäuse gegen Fremdlicht  4 protective housing against ambient light
5 Stahlband  5 steel strip

Claims

Patentansprüche claims
1. Verfahren zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material durch Bestrahlen der zu untersuchenden Oberfläche über ihre gesamte Breite mit UV-Licht und Detektion der von der Oberfläche reflektierten oder emittierten Strahlung mittels wenigstens eines Sensors über die gesamte Breite der Oberfläche, dadurch gekennzeichnet, dass die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. 1. A method for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material by irradiating the surface to be examined over its entire width with UV light and detection of the surface reflected or emitted radiation by means of at least one sensor over the entire width the surface, characterized in that the UV light source and the at least one sensor are mounted stationary to each other and to the moving belt.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Benetzungsgrad das Verhältnis von unbenetzter Oberfläche des Bandes zu gesamter untersuchter Oberfläche des Bandes ist. 2. The method according to claim 1, characterized in that the wetting degree is the ratio of unwetted surface of the tape to the entire examined surface of the tape.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Oberfläche mit einem hydrophoben Medium, bevorzugt einem Öl, benetzt ist. 3. The method according to claim 1 or 2, characterized in that the surface is wetted with a hydrophobic medium, preferably an oil.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es sich bei dem Band um ein Stahlflachprodukt handelt. 4. The method according to any one of claims 1 to 3, characterized in that it is the strip is a flat steel product.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die zu untersuchende Oberfläche mit UV-A- Licht bestrahlt wird. 5. The method according to any one of claims 1 to 4, characterized in that the surface to be examined is irradiated with UV-A light.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass als wenigstens ein Sensor eine Kamera eingesetzt wird. 6. The method according to any one of claims 1 to 5, characterized in that as at least one sensor, a camera is used.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sich an die Detektion der von der Oberfläche reflektierten Strahlung eine Auswertung anschließt. 7. The method according to any one of claims 1 to 6, characterized in that adjoining the detection of the radiation reflected from the surface of an evaluation.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Breite des Bandes 550 bis 2200 mm und die Dicke des Bandes 0,4 bis 4 mm betragen. 8. The method according to any one of claims 1 to 7, characterized in that the width of the belt 550 to 2200 mm and the thickness of the belt are 0.4 to 4 mm.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass trockene Stellen, d. h. nicht vollständig benetzte Stellen, auf der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material detektiert werden . 9. The method according to any one of claims 1 to 8, characterized in that dry spots, d. H. incompletely wetted sites are detected on the surface of a longitudinally moving belt of at least one material.
10. Vorrichtung zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material, umfassend eine UV-Lichtquelle, die die gesamte Breite des Bandes bestrahlt und wenigstens einen Sensor, der die gesamte Breite der Oberfläche detektiert, dadurch gekennzeichnet, dass die UV-Lichtquelle und der wenigstens eine Sensor ortsfest zu einander und zu dem bewegten Band angebracht sind. Apparatus for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material, comprising a UV light source irradiating the entire width of the belt and at least one sensor detecting the entire width of the surface, characterized in that the UV light source and the at least one sensor are fixedly attached to each other and to the moving belt.
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass diese in unmittelbarer Nähe zu oder direkt in einer Ölmaschine angebracht ist. 11. The device according to claim 10, characterized in that it is mounted in close proximity to or directly in an oil machine.
12. Verwendung der Vorrichtung nach Anspruch 10 oder 11 zur Detektion des Benetzungsgrades der Oberfläche eines in Längsrichtung bewegten Bandes aus wenigstens einem Material. 12. Use of the device according to claim 10 or 11 for detecting the degree of wetting of the surface of a longitudinally moving belt of at least one material.
PCT/EP2018/063646 2017-05-30 2018-05-24 Identification of dry areas on oiled steel strips by means of uv light WO2018219775A1 (en)

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