EP3456436A1 - Système d'inspection et procédé de contrôle de la fonctionnalité d'une buse de pulvérisation, en particulier dans une machine de coulée continue - Google Patents

Système d'inspection et procédé de contrôle de la fonctionnalité d'une buse de pulvérisation, en particulier dans une machine de coulée continue Download PDF

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Publication number
EP3456436A1
EP3456436A1 EP18194726.8A EP18194726A EP3456436A1 EP 3456436 A1 EP3456436 A1 EP 3456436A1 EP 18194726 A EP18194726 A EP 18194726A EP 3456436 A1 EP3456436 A1 EP 3456436A1
Authority
EP
European Patent Office
Prior art keywords
spray
image
spray nozzle
camera
inspection system
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP18194726.8A
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German (de)
English (en)
Other versions
EP3456436B1 (fr
Inventor
Sergey Gorainov
Artemy Krasilnikov
Christoph Tischner
Christian Plociennik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
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SMS Group GmbH
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Filing date
Publication date
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Publication of EP3456436A1 publication Critical patent/EP3456436A1/fr
Application granted granted Critical
Publication of EP3456436B1 publication Critical patent/EP3456436B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the invention relates to an inspection system for monitoring the operability of at least one spray nozzle, in particular a spray nozzle in a continuous casting plant. Moreover, the invention relates to a strand guide with such an inspection system and a method for operating the inspection system.
  • An apparatus and a method for optical testing of a spray nozzle in a continuous casting plant is known in the art, for example, from the German patent application DE 10 2011 005 860 A1 known.
  • this publication discloses a device for testing a spray nozzle in a continuous casting, wherein the device is a running member, for. B. a Rollenchecker or cold strand has to go through the continuous casting.
  • An opto-electronic sensor in particular a video camera, is mounted on the running member with the aid of which the properties of the spray nozzle can be measured. With the aid of the optical sensor, the spray pattern of the spray nozzle is recorded and subsequently evaluated by means of a preferably automatic image evaluation method.
  • nozzle parameters in particular the coolant pressure of the nozzle, are varied and then also a recording of the spray pattern is made in response to this variation of the nozzle parameters.
  • the published patent application discloses that the light source is associated with a lighting means in order to illuminate the cooling nozzles to be photographed accordingly.
  • the invention is based on the object, a known inspection system and method for checking the functionality a spray nozzle and a strand guide with such an inspection system to the effect that the verification of the functionality of the spray nozzle is further improved.
  • the light source is a laser light source for emitting a plurality of preferably parallel laser light beams which span a projection surface for generating the image of at least one spray spot generated in the projection surface by the sprayed liquid.
  • the camera is positioned at a suitable location to capture the image in the screen. It need not necessarily be arranged opposite to the spray nozzle; rather, it can be installed at any angle to the projection surface in front of and behind it. The possibly slightly distorted image can - if necessary - be transformed by means of subsequent image processing.
  • the projection surface between the outlet opening of the spray nozzles and the camera is formed and aligned perpendicular to the main spray direction of the spray nozzle.
  • the core feature of the present invention is thus the generation of the projection surface by the laser beams.
  • This virtually virtual because only formed by the laser light beams projection surface advantageously allows a good imaging and visualization of the spray marks sprayed from the spray liquid, because due to the virtuality and transparency of the projection surface, the liquid can pass through the projection plane unhindered.
  • the spray marks in the projection surface of laser light beams according to the invention are not distorted or distorted by founded on the spray marks. Due to the more realistic spray marks a more accurate check of the functionality of the respective spray nozzle is possible.
  • Images of the spray marks can be reliably detected in particular a blockage or a complete failure of the respective spray nozzle. This is important to prevent the cast strand to be cooled in a continuous casting plant from being cooled sufficiently or only unevenly, which can lead to undesired thermal stresses in the strand, for example to longitudinal cracks in the strand surface.
  • the evaluation of the spray spot recorded by the camera represents an actual image of a cross section through the spray cone of the spray nozzle to be tested.
  • the evaluation of the image with regard to a defect or an incorrect alignment of the spray nozzle can be carried out either by a correspondingly experienced operator or automatically.
  • the camera is designed as a digital camera and a module is provided, preferably a software module for the automatic evaluation of the recorded image with regard to a defect and / or an incorrect alignment of the spray nozzle.
  • the laser light source is arranged such that the projection surface extends as a projection plane perpendicular to the spray direction of the spray nozzle. This has the advantage that the image of the spray spot is not distorted by a skewed position of the projection surface.
  • the projection surface is arranged at a distance from the camera.
  • the camera can then be advantageously focused on the projection plane for taking the image of the spray spot in the projection plane, so that then a sharp image of the spray spot can be recorded.
  • the space, in particular within a strand guide, is limited, which is why the combination of camera and light source for generating the projection surface should be built as compactly as possible in a space-saving manner.
  • a certain minimum distance to focus the camera is helpful.
  • a distance value a between, for example, 1 to 2 cm has proven itself in practice.
  • the camera is designed as a digital camera and has a communication interface, preferably a read-write module.
  • the data of the recorded images can then be exchanged very easily with other digital devices, in particular in a cyber-physical environment.
  • the data can then be very easily transmitted from the digital camera to the module for evaluating the recorded image as a digital device.
  • the image data can also be transmitted to a digital memory, preferably wirelessly for storage.
  • the data memory can be arranged, for example, on a segment of the strand guide. This has the advantage that in the maintenance of the segment whose assigned data memory can be read and then immediately available information about a possible defect or a misalignment of individual spray nozzles.
  • the evaluation of the recorded actual image of the spray spot can be done by comparing this actual image with a predetermined target image for the spray spot with proper operation of the spray nozzle. A possibly detected in this comparison image deviation then allows conclusions about a defect and / or incorrect alignment of the spray nozzle.
  • the predetermined target image of an optimally functioning spray nozzle may possibly be taken from the specification issued by the manufacturer of the respective spray nozzle or determined by recording the spray spot of the optimally functioning spray nozzle in the projection plane.
  • FIG. 1 It shows a continuous casting machine 200 known in the prior art. It comprises a mold 210 for casting a cast strand and a strand guide 220 downstream of the mold 210 in the casting direction, with a multiplicity of pairs of rolls for deflecting the cast strand cast in the mold 210 from the vertical to the horizontal.
  • the pairs of strand guide rollers can be summarized in so-called strand guide segments 225.
  • FIG. 2 shows a detailed view of the strand guide 220 after FIG. 1 .
  • There are a plurality of pairs of rollers to recognize of which in each case a first strand guide roller on the lot side, ie relative to the curvature of the strand guide further inboard, and a second strand guide roller of the roller pair respectively on the fixed side, ie based on the curvature further outboard.
  • each spray nozzles 110 are arranged recognizable.
  • a mobile carrier device 260 which carries the camera 120 according to the invention and the laser light source 130.
  • the carrier device may be, for example, a known roller test device (roller checker) typically used for testing the strand guide or a cold strand.
  • a module 140 for automatic evaluation of the image taken by the camera 120 with regard to a defect and / or an incorrect alignment of the spray nozzle 110 can be arranged on the carrier device 260. Alternatively, however, this module can also be arranged away from the carrier device 260, for. B. in segment row.
  • the camera 120 and the laser light source 130 are arranged only on the upper side of the support 260 for checking the spray nozzles 110 on the loose side of the strand guide.
  • a camera 120 and a laser light source 130 can also be mounted on the underside of the carrier device 260 in order to be able to check the functionality of the spray nozzles 110 on the fixed side of the strand guide 220.
  • FIG. 3 shows a detailed view of the FIG. 2
  • the liquid sprayed in this way strikes a projection surface 134 generated by the laser light source 130.
  • This projection surface preferably extends as a plane perpendicular to the main spray direction of the spray nozzle 110.
  • the distance a between the projection surface 134 and the at least one camera 120 is for example 1-2 cm.
  • the camera 120 may be installed at any other location from which the projection plane or image may be received therein.
  • the projection surface 134 is generated from a plurality of parallel laser light beams, which are emitted by a laser light source 130.
  • the projection surface 134 as a laser light plane can also be generated directly by the laser light source 130.
  • the spray spot in the projection plane 134 is ideally circular with respect to its contour and "evenly colored” in its interior.
  • the uniform "coloration” indicates a uniform intensity distribution of the sprayed liquid.
  • the image taken by the camera of such an ideal spray spot is also referred to below as the target image 138 of the spray spot.
  • the camera 120 may be connected to one or more signalers that give an instruction to receive the spray spots of the spray cones.
  • FIG. 4 shows examples of such different actual images of spray marks.
  • FIG. 4 (a) shows an actual image 136 of a properly functioning spray nozzle 110.
  • the actual image 136 is clearly bordered, its contour corresponds exactly to the contour of a target image 138 of an optimally functioning spray nozzle 110.
  • the actual image 136 is also in its interior homogeneous; There are no differences in the density of the sprayed liquid.
  • FIG. 4 (b) Here, a deviation of the actual image 136 of the spray spot of a non-optimally functioning spray nozzle 110 compared to the target image 138 of an optimum spray nozzle can be clearly seen. In particular, the edges of the actual image 136 do not correspond to the desired target contour.
  • FIG. 4 (c) The actual image 136 shows two separate partial spray spots, which should actually be connected. In addition, here too, the edge is not formed according to the shown target image.
  • FIG. 5 shows two actual images of spray spots of adjacent spray nozzles.
  • the overlap of the spray spots may or may not be desired.
  • the camera 120 in particular if it is designed as a digital camera, can be assigned a communication interface 122 for preferably wireless communication with other digital devices, in particular in a cyber-physical system.
  • the digital device can be, for example, the module 140 for evaluating the recorded image, wherein the communication interface is then designed to transmit the recorded actual image, preferably wirelessly, to the module 140.
  • the digital device may be a digital data memory 252.
  • the communication interface 122 can also transmit image data to this data memory, then typically for storage, preferably also for long-term storage.
  • the storage of the actual images of spray spots advantageously offers the possibility of documenting the change in the spray spots of one and the same spray nozzle 110 as a function of the operating hours of the spray nozzle. From a given degree of deterioration, replacement of the spray nozzle, for example, may then be recommended.
  • the inventive method allows the measurement of the dimensions of the spray spot as a cross section of the spray cone for each spray nozzle in a few millimeters above the level of the strand surface.
  • the measurement of the spray cone can, as I said, for a single nozzle but also for a row of nozzles or the entire nozzle carpet on the loose and / or fixed side of the strand guide alone already be carried out with a single test drive the carrier.
  • the evaluation of the actual images also allows the determination of the percentage spraying power of each individual nozzle in relation to a predetermined desired spraying power for each individual nozzle type with respect to the respective installation position in the strand guide. This is done by evaluating the respective cross section or the respective cross sectional area of the respective spray spot. If the total area of the actual image of a spray spot is smaller than the area of the target image of the spray spot, then this indicates a reduced spray performance of the spray nozzle. Depending on the extent of the underpowered replacement of the spray nozzles is recommended.
  • the device generates ad hoc images of the spray spot of the entire nozzle row.
  • the area of the imaged spray spot is compared with the calculated target area of the spray spot on the basis of the opening angle (in the casting direction and over the strand width) noted in the specification of the equipment and the nozzle carpet, for each individual nozzle or nozzle type.
  • a percentage comparison of the measured actual and desired areas of the spray spot can be included as an index of the nozzle condition.
  • An average value (or deviation) of all calculated states of the nozzles of a segment and of the complete nozzle carpet can serve as an index of the state of the segment of the strand guide.
  • the image acquisition can easily be regarded as an explanation and proof of the obtained measured values including outliers.
  • the overlap of the spray spots and the size of the spray spot generated by the individual spray nozzle can be evaluated on the basis of design data, instead of the previous evaluation by means of reference values.
  • the formed splash water at the edge of the spray spot or on the underlying roll will not prevent the recording of the measurement results.
  • the condition of the nozzle can be clearly identified.
  • the device is capable of verifying any position of the nozzles in the width direction with the same degree of evaluation.
  • the misaligned spray cones of the built-in nozzles can be easily identified if the results of the single nozzle measurement differ in the segment workshop and in the continuous casting machine.
  • the camera of the inspection device is not only designed to determine the functionality of spray nozzles, but also to detect the state of mold plates and strand guide rollers within a continuous casting. In contrast to a new condition, it is possible in particular to detect contamination, calcification or wear, which in each case represent a deteriorated state or a defect.
  • FIG. 6 shows such detected defects or soils on a strand guide roll 228. Such defects result in different errors in the dimensions or surface of the cast strand produced during casting. The defects thus detected can then be taken as an opportunity to replace the corresponding components.
  • the respective current actual state of a spray nozzle 110, a segment 225, or a mold 210 is regularly documented to detect its change over time.
  • FIG. 7 Figure 10 shows the changes of defects or soils on a strand guide roller 228. Again, these changes in conditions or defects over time may be a deciding criterion for a spray nozzle, strand guide roll, segment or mold change.
  • the provision of the laser light source and the formation of the projection planes is not required.
  • the use of the camera is preferably carried out in dry test drive, d. H. if the secondary cooling is switched off.
  • the camera then provides good photo and / or video recordings of the mold plates or the strand guide rollers. These images then represent very well the current state of the continuous casting, but also possible role misalignments or role rotations, a possible roll impact, a possible Rollen shedbiegung or outliers in the measurements of mouth widths.
  • FIG. 9 During a test drive taken pictures of the mold surface on the fixed or Losseite the strand guide, as in FIG. 9 are displayed in the module for image evaluation according to the above algorithm the plausibility check evaluated. For example, an evaluation of FIG. 9 Recognize how tightly the mold was adjusted or mounted when setting up the caster.
  • the recorded actual images of a strand guide segment, of the mold or of a strand guide roller can be supplemented after their evaluation with measured values, as they were determined in, for example, a Rollchecker test drive. These measurements are, for example, values from a crack, spray mark, or limescale deposition analysis.
  • FIG. 8 shows an image of a strand guide roller 228, which for the viewing operator with different readings, eg. B. jaw width 249.4 mm, roller misalignment 0.7 mm or rollability 3/6 was enriched.
  • the images supplemented with these values can then be transmitted within an augmented reality AR application to the staff in the workshop, the casting floor or the control desk.
  • the images or the supplemented images may be associated with a digital profile of a particular component, a cyber-twin of the component in a CP system, and other applications, e.g. For condition monitoring, for evaluation.
  • a resulting collection of images represents a detailed visual documentation of the changes in the state of individual components of a continuous casting during their operating time.
  • the resulting life records of the individual components such as segments of strand management, can be used as a template for a subsequent analysis of changes serve the individual components.
  • the formation of cracks on the mold surface in various coatings, the formation of limescale deposits on the roll surface in the strand guide at different formats of the cast strand can be documented.
  • a cyber-physical CP module of the respective individual component eg. B. a segment or the mold, the images with the component in the respective responsible workshop mitüberstofft and they are then the local staff in the repair and work preparation available.
  • the carrier device 260 or the roller checker can be expanded by the installation of an electric motor for rotating strand guide rollers in the segment. In order to it is possible to test the entire roll surface for cracks, wear of the coating or deflection of the rolls.
  • the camera on the support means can be used as a high resolution endoscope for a careful inspection of the individual components of the continuous casting machine.
  • roller misalignments can be detected in this way, which could not be detected in a traditional test method, in which it is inferred from the measurement of cast cast strand on misalignment of the roles.
  • the images can provide important clues for replacing individual segments in the next strand guide repair.
  • the digital camera system can be extended by setting up a read and write module to store the recorded images in so-called smart labels, which are assigned to the individual components of the strand guide, such as the segments or the mold. With this extension, the measuring system can establish active communication with other intelligent devices on, for example, the segments, the mold or the cold extruder carriage, or with a cyber-physical environment.
  • the CP system, the CP environment, decentralized data processors and the measurement system described can also optionally be coupled to a cloud.
  • the described decentralized data storage does not exclude a connection to a cloud service. All recorded images, measurement and calculation results can be stored in a cloud-based data storage for later use by means of the IoT technologies.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP18194726.8A 2017-09-19 2018-09-17 Système d'inspection et procédé de contrôle de la fonctionnalité d'une buse de pulvérisation, en particulier dans une machine de coulée continue Active EP3456436B1 (fr)

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EP3456436B1 EP3456436B1 (fr) 2023-11-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113290218A (zh) * 2021-05-19 2021-08-24 日照钢铁控股集团有限公司 一种连铸机扇形段喷嘴的设计方法
WO2021224377A1 (fr) 2020-05-07 2021-11-11 Sms Group Gmbh Système d'inspection et procédé de vérification simultanée de l'aptitude fonctionnelle d'une pluralité de buses de pulvérisation dans une installation de coulée continue, en particulier des buses de pulvérisation disposées entre deux rouleaux de guidage de brin

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004041671A1 (de) * 2004-08-27 2006-03-02 Linde Ag Überwachung von Spritzprozessen
US20070242871A1 (en) * 2006-03-23 2007-10-18 Pratt & Whitney Canada Corp. Method of computing spray parameters from optical patternation
KR20090039165A (ko) * 2007-10-17 2009-04-22 (주)윈티앤에스 비접촉식 세그먼트 롤 체커
DE102011005860A1 (de) 2011-02-17 2012-08-23 Sms Siemag Ag Vorrichtung und Verfahren zur Prüfung einer Stranggießanlage
CN104722735A (zh) * 2015-04-08 2015-06-24 安徽工业大学 一种利用激光检测连铸二冷区喷嘴工作状况的装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004041671A1 (de) * 2004-08-27 2006-03-02 Linde Ag Überwachung von Spritzprozessen
US20070242871A1 (en) * 2006-03-23 2007-10-18 Pratt & Whitney Canada Corp. Method of computing spray parameters from optical patternation
KR20090039165A (ko) * 2007-10-17 2009-04-22 (주)윈티앤에스 비접촉식 세그먼트 롤 체커
DE102011005860A1 (de) 2011-02-17 2012-08-23 Sms Siemag Ag Vorrichtung und Verfahren zur Prüfung einer Stranggießanlage
CN104722735A (zh) * 2015-04-08 2015-06-24 安徽工业大学 一种利用激光检测连铸二冷区喷嘴工作状况的装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021224377A1 (fr) 2020-05-07 2021-11-11 Sms Group Gmbh Système d'inspection et procédé de vérification simultanée de l'aptitude fonctionnelle d'une pluralité de buses de pulvérisation dans une installation de coulée continue, en particulier des buses de pulvérisation disposées entre deux rouleaux de guidage de brin
DE102020205740A1 (de) 2020-05-07 2021-11-11 Sms Group Gmbh Inspektionssystem und Verfahren zum gleichzeitigen Überprüfen der Funktionsfähigkeit von mehreren Spritzdüsen in einer Stranggießanlage, insbesondere von den zwischen zwei Strangführungsrollen angeordneten Spritzdüsen
CN113290218A (zh) * 2021-05-19 2021-08-24 日照钢铁控股集团有限公司 一种连铸机扇形段喷嘴的设计方法
CN113290218B (zh) * 2021-05-19 2022-07-01 日照钢铁控股集团有限公司 一种连铸机扇形段喷嘴的设计方法

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