EP3456436B1 - 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
EP3456436B1
EP3456436B1 EP18194726.8A EP18194726A EP3456436B1 EP 3456436 B1 EP3456436 B1 EP 3456436B1 EP 18194726 A EP18194726 A EP 18194726A EP 3456436 B1 EP3456436 B1 EP 3456436B1
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EP
European Patent Office
Prior art keywords
camera
spray
image
laser light
light source
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.)
Active
Application number
EP18194726.8A
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German (de)
English (en)
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EP3456436A1 (fr
Inventor
Sergey Gorainov
Artemy Krasilnikov
Christoph Tischner
Christian Plociennik
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP3456436A1 publication Critical patent/EP3456436A1/fr
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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 a strand guide with an inspection system.
  • a device and a method for optically inspecting a spray nozzle in a continuous casting plant is in the prior art, for example from the German published patent application DE 10 2011 005 860 A1 known.
  • this publication discloses a device for testing a spray nozzle in a continuous casting plant, the device having a running member, e.g. B. has a roller checker or cold strand for passing through the continuous casting system.
  • An optoelectronic sensor in particular a video camera, is attached to the running member, with the help of which the properties of the spray nozzle can be measured. With the help of the optical sensor, the spray pattern of the spray nozzle is recorded and then evaluated using a preferably automatic image evaluation method.
  • nozzle parameters in particular the coolant pressure of the nozzle, are varied and then a recording of the spray pattern is also made in response to this variation of the nozzle parameters.
  • the published publication discloses that the light source is assigned a lamp in order to accordingly illuminate the cooling nozzles to be photographed.
  • the Chinese patent application CN 104722735 A and the Korean patent application KR 2009/0039 165 A describe the use of lasers and cameras to check the functionality of a spray nozzle in a continuous casting plant.
  • four lasers and four cameras are mounted at different points on a cold strand head.
  • the lasers and cameras take on different tasks, such as checking the surface of the mold, centering the guide roller or checking the functionality of the cooling nozzles.
  • the collected information is forwarded to a server in real time and then wirelessly forwarded to a monitoring system.
  • the invention is based on the object of developing a strand guide with a known inspection system in such a way that the checking of the functionality of the spray nozzle is further improved.
  • This task is solved by the subject matter of claim 1.
  • the first camera 120 and the first laser light source 130 are arranged to check the spray nozzles 110 on the loose side of the strand guide 220 and / or that the second camera and the second laser light source are arranged to check the spray nozzles on the fixed side of the strand guide ;
  • the laser light source is designed to emit a plurality of preferably parallel laser light beams 132, which span the projection surface 134 to generate the image of at least one spray spot 136 generated in the projection surface by the sprayed liquid 115; and that the projection surface 134 is arranged between the camera and the outlet opening of the spray nozzle 110.
  • the camera is positioned at a suitable location to record the image in the projection surface. It does not necessarily have to be arranged opposite 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 using subsequent image processing.
  • the projection surface is preferably formed between the outlet opening of the spray nozzles and the camera and is aligned perpendicular to the main spray direction of the spray nozzle.
  • the core feature of the present invention is therefore the generation of the projection surface by the laser beams.
  • This quasi-virtual projection surface which is formed only by the laser light beams, advantageously enables good imaging and visualization of the spray spots of the liquid sprayed by the spray nozzle, because due to the virtuality or transparency of the projection surface, the liquid can pass through the projection plane unhindered.
  • a material projection surface such as B. a screen, which would also represent an actual obstacle for the liquid
  • the spray spots in the projection surface according to the invention from laser light beams are not distorted or falsified by back-reflected liquid components. Represent the spray spots in the projection surface Therefore, the actual functionality of the respective spray nozzle is very accurate.
  • 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 image can be evaluated with regard to a defect or incorrect alignment of the spray nozzle either by an appropriately experienced operator or automatically.
  • the camera is designed as a digital camera and a module is provided, preferably a software module, for automatically evaluating the recorded image with regard to a defect and/or 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 spraying direction of the spray nozzle. This has the advantage that the image of the spray spot is not distorted by an inclined position of the projection surface.
  • the projection surface is arranged at a distance from the camera.
  • the camera can then advantageously be focused on the projection plane to record the image of the spray spot in the projection plane, so that a sharp image of the spray spot can then be recorded.
  • the space, especially within a cable guide, is limited, which is why the combination of camera and light source to create the projection surface should be as space-saving and compact as possible.
  • a certain minimum distance is required Focusing the camera helpful.
  • a distance value a between, for example, 1 - 2 cm has proven useful in practice as a compromise value.
  • the camera is designed as a digital camera and has a communication interface, preferably a read/write module.
  • the data from the captured images can then be exchanged very easily with other digital devices, especially in a cyber-physical environment.
  • the data can then be transmitted very easily from the digital camera to the module for evaluating the recorded image as a digital device.
  • the image data can also be transferred 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 when servicing the segment, its assigned data memory can be read out and information about a possible defect or incorrect alignment of individual spray nozzles is then immediately available.
  • the recorded actual image of the spray spot can be evaluated by comparing this actual image with a predetermined target image for the spray spot when the spray nozzle is functioning properly. Any image deviation that may be detected during this comparison then allows conclusions to be drawn about a defect and/or incorrect alignment of the spray nozzle.
  • the specified target image of an optimally functioning spray nozzle can possibly be taken from the specification of the respective spray nozzle issued by the manufacturer or can be determined by recording the spray spot of the optimally functioning spray nozzle in the projection plane.
  • Figure 1 shows a continuous casting system 200 known in the prior art. It comprises a mold 210 for casting a casting strand and a strand guide 220 downstream of the mold 210 in the casting direction with a plurality of pairs of rollers for deflecting the casting strand cast in the mold 210 from the vertical to the horizontal.
  • the pairs of strand guide rollers can be combined in so-called strand guide segments 225.
  • FIG 2 shows a detailed view of the strand guide 220 Figure 1 .
  • a large number of pairs of rollers can be seen, of which a first strand guide roller is arranged on the loose side, ie further inside in relation to the curvature of the strand guide, and a second strand guide roller of the pair of rollers is arranged in each case on the fixed side, ie further outwards in relation to the curvature.
  • Spray nozzles 110 are clearly arranged in the casting direction between the strand guide rollers 228. These each spray a liquid 115, typically a coolant, onto a casting strand (not shown here) between the pairs of rollers via an outlet opening 112.
  • a preferably mobile carrier device 260 which carries the camera 120 according to the invention and the laser light source 130.
  • the carrier device can be, for example, a known roll testing device (roll checker) typically used for checking the strand guide, or a cold strand.
  • a module 140 for automatically evaluating the image recorded by the camera 120 with regard to a defect and/or incorrect alignment of the spray nozzle 110 can be arranged on the carrier device 260. Alternatively, this module can also be arranged away from the carrier device 260, for example. B. in a row of segments.
  • the camera 120 and the laser light source 130 are only arranged on the top of the carrier device 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 Figure 2 already known inspection system 100 according to the invention.
  • the spray nozzle 110 can be seen again with an outlet opening 112, from which the liquid 115 to be sprayed emerges in the form of a spray cone.
  • the liquid sprayed in this way hits 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 constellation of camera 120 and projection surface 134 shown, according to which the projection surface 134 is arranged between the camera and the outlet opening of the spray nozzle, is merely an example. Rather, the camera 120 can be installed at any other location from which the projection plane or the image therein can be recorded.
  • 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 can also be generated directly from the laser light source 130 as a laser light plane.
  • the spray spot in the projection plane 134 is ideally circular in terms of its contour and uniformly or harmoniously "colored” inside;
  • the uniform "coloring” indicates an even intensity distribution of the sprayed liquid.
  • the image of such an ideal spray spot recorded by the camera is also referred to below as the target image 138 of the spray spot.
  • spray nozzle 110 If the spray nozzle 110 is not functioning properly, its spray spots typically do not have a clean circular border or several spray spots form in the projection plane 134.
  • the camera 120 can be connected to one or more signal transmitters that give a command to record the spray spots of the spray cones.
  • Figure 4 shows examples of such different actual images of spray spots.
  • Figure 4 (a) shows an actual image 136 of a properly functioning spray nozzle 110.
  • the actual image 136 has a clean border, 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 inside homogeneous; There are no differences in density of the sprayed liquid.
  • Figure 4 (b) Here you can clearly see a deviation in the actual image 136 of the spray spot recorded by the camera from a spray nozzle 110 that does not function optimally compared to the target image 138 of an optimal spray nozzle. In particular, the edges of the actual image 136 do not correspond to the desired target contour.
  • Figure 4 (c) The actual image 136 shows two separate partial spray spots that should actually be connected. In addition, here too the edge is not designed according to the target image shown.
  • Figure 5 shows two actual images of spray spots from neighboring spray nozzles. Overlapping 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, with the communication interface then being designed to transmit the recorded actual image to the module 140, preferably wirelessly.
  • the digital device can be a digital data storage 252.
  • the communication interface 122 can also transmit image data to this data memory, then typically for storage, preferably also for long-term storage.
  • Storing 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 depending on the operating hours of the spray nozzle. From a given degree of deterioration, a replacement of the spray nozzle can then be recommended, for example.
  • the method according to the invention enables the dimensions of the spray spot to be measured as a cross section of the spray cone for each individual spray nozzle in a few millimeters above the plane of the strand surface.
  • the measurement of the spray cones can be carried out for a single nozzle, but also for a row of nozzles or the entire carpet of nozzles on the loose and/or fixed side of the strand guide with just a single measuring run of the carrier device.
  • the evaluation of the actual images also makes it possible to determine the percentage spray performance of each individual nozzle in relation to a specified target spray performance for each individual nozzle type with regard 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 entire 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 reduced performance, replacing the spray nozzles is recommended.
  • the device generates ad hoc images of the spray spot of the entire row of nozzles.
  • the area of the depicted spray spot is compared with the calculated target area of the spray spot using the opening angles (in the casting direction and across the strand width) noted in the specification of the system and the nozzle carpet, for each individual nozzle or nozzle type.
  • a percentage comparison of the measured actual and target areas of the spray spot can be recorded as an index of the nozzle condition.
  • An average (or deviation) of all calculated states of the nozzles of a segment and the entire nozzle carpet can serve as an index of the state of the strand guide segment.
  • the image recording can easily be seen as an explanation and proof of the measured values achieved, including outliers.
  • the overlap of the spray spots and the size of the spray spot created by the individual spray nozzle can be evaluated using design data instead of the previous evaluation using reference values.
  • the splash water formed at the edge of the spray spot or on the roller underneath will not prevent the measurement results from being recorded.
  • the condition of the nozzle can be clearly identified based on the spray spot of each individual spray nozzle.
  • the device is able to verify any positioning of the nozzles in the width direction with the same degree of evaluation.
  • the incorrectly oriented spray cones of the installed nozzles can be easily identified if the results of the individual nozzle measurement in the segment workshop and in the continuous casting machine differ.
  • the camera of the inspection device is not only designed to determine the functionality of spray nozzles, but also to record the condition of mold plates and strand guide rollers within a continuous casting plant. Compared to a new condition, in particular contamination, limescale deposits or wear can be detected, each of which represents a deteriorated condition or a defect.
  • Figure 6 shows such detected defects or contamination on a strand guide roller 228. Such defects lead to different errors in the dimensions or the surface of the cast strand produced during casting. The defects identified in this way can then be used as an opportunity to replace the corresponding components.
  • the current actual state of a spray nozzle 110, a segment 225, or a mold 210 is regularly documented in order to recognize its changes over time.
  • Figure 7 shows the changes in defects or contamination on a strand guide roller 228. These changes in conditions or defects over time can also be a decision criterion for changing a spray nozzle, strand guide roller, segment or mold.
  • the provision of the laser light source and the formation of the projection planes are not necessary.
  • the camera is preferably used during dry test runs, i.e. H. when 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 image recordings then represent very well the current condition of the continuous casting system, but also possible roller misalignments or roller rotations, possible roller runout, possible roller deflection or outliers in the jaw width measurements.
  • Figure 9 Images of the mold surface on the fixed or loose side of the strand guide taken during a measurement run, as shown in Figure 9 are shown in the module for image evaluation according to the above-mentioned plausibility check algorithm evaluated. For example, an evaluation of Figure 9 You can see how closely the mold was adjusted or mounted to the foot roller during setup.
  • the recorded actual images of a strand guide segment, of the mold or of a strand guide roller can be supplemented with measured values, such as those determined during a roller checker measurement run, for example. These measured values are, for example, values from a crack, spray spot or limescale analysis.
  • Figure 8 shows an image of a strand guide roller 228, which is available to the viewing operator with various measured values, e.g. B. Mouth width 249.4 mm, roller misalignment 0.7 mm or roller mobility 3/6 was enriched.
  • the images supplemented with these values can then be transmitted to the personnel in the workshop, the casting platform or the control center within an augmented reality AR application.
  • the images or the supplemented images can be assigned to a digital profile of a specific component, a cyber twin of the component in a CP system and other applications, e.g. B. for condition monitoring, can be submitted for evaluation.
  • a collection of images created in this way represents a detailed visual documentation of the changes in the condition of individual components of a continuous casting plant during its operating time.
  • the resulting and collected life records of the individual components for example segments of the strand guide, can be used as a template for a subsequent analysis of changes serve the individual components. For example, the formation of cracks on the mold surface with different coatings and the formation of limescale deposits on the roll surface in the area of the strand guide with different formats of the casting strand can be documented.
  • a cyber-physical CP module of the respective individual component e.g. B. of a segment or the mold, the images are sent with the component to the relevant workshop and are then available to the staff there for repairs and work preparation.
  • the carrier device 260 or the roll checker can be expanded by installing an electric motor for rotating strand guide rollers in the segment. With it is possible to check the entire roller surface for cracks, wear of the coating or deflection of the rollers.
  • a remote control can be provided for the mobile carrier device 260 in order to control its passage through the continuous casting plant in the desired manner.
  • the camera on the carrier device can be used as a high-resolution endoscope for a careful inspection of the individual components of the continuous casting system.
  • misalignments of the rollers can be detected, which could not be detected using a traditional test method in which the measurement of the cast strand is used to determine whether the rollers are misaligned.
  • the images can provide important information about replacing individual segments the next time the strand guide is repaired.
  • the digital camera system can be expanded by setting up a reading and writing module in order to save 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 expansion, the measuring system can establish active communication with other intelligent devices on, for example, the segments, the mold or the cold bar car, or with a cyber-physical environment.
  • the CP system, the CP environment, decentralized data processors and the measurement system described can also optionally be connected to a cloud.
  • the decentralized data storage described does not exclude a connection to a cloud service. All captured images, measurement and calculation results can be stored in a cloud-based data storage for later use using 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)

Claims (7)

  1. Guide de barre (220) destiné à guider une barre de coulée après avoir quitté une lingotière (210) dans une installation de coulée continue (200), comprenant :
    des buses de pulvérisation (110) comportant un orifice de sortie (112) permettant de pulvériser un liquide (115) afin de refroidir la barre de coulée ; et
    un système d'inspection (100) pour vérifier le bon fonctionnement des buses de pulvérisation (110), comprenant :
    au moins une caméra (120) pour capturer une image dans une surface de projection ; et
    une source lumineuse (130) associée à la caméra, sous la forme d'une source lumineuse laser ;
    dans lequel une première caméra (120) et une première source lumineuse laser (130) du système d'inspection sont montées sur la face supérieure d'un dispositif de support mobile (260) et/ou une seconde caméra et une seconde source lumineuse laser sont montées sur la face inférieure du dispositif de support mobile (260) ; et
    dans lequel le dispositif de support est conçu, par exemple, sous la forme d'un dispositif d'inspection à rouleaux ou d'une barre froide ;
    caractérisé en ce que
    la première caméra (120) et la première source lumineuse laser (130) sont agencées de façon à contrôler les buses de pulvérisation (110) sur le côté libre du guide de barre (220) et/ou en ce que la seconde caméra et la seconde source lumineuse laser sont agencées de façon à contrôler les buses de pulvérisation sur le côté fixe du guide de barre ;
    la source lumineuse laser est conçue pour émettre une pluralité de faisceaux de lumière laser (132), de préférence parallèles, qui couvrent la surface de projection (134) pour générer l'image d'au moins une tache de pulvérisation (136) générée dans la surface de projection par le liquide pulvérisé (115) ; et la surface de projection (134) est disposée entre la caméra et l'orifice de sortie de la buse de pulvérisation (110).
  2. Guide de barre (220) selon la revendication 1, caractérisé en ce que le système d'inspection comporte en outre un module (140) pour l'évaluation automatique de l'image enregistrée en vue de détecter un défaut et/ou un mauvais alignement de la buse de pulvérisation (110).
  3. Guide de barre (220) selon la revendication 1, caractérisé en ce que la source lumineuse laser (130) est disposée de telle sorte que la surface de projection (134) s'étend comme plan de projection perpendiculairement à la direction d'injection principale de la buse de pulvérisation (110).
  4. Guide de barre (220) selon l'une des revendications précédentes, caractérisé en ce que la surface de projection (134) est formée à une distance a, avec par exemple 1cm < a < 2 cm, par rapport à la caméra (120).
  5. Guide de barre (220) selon l'une des revendications précédentes, caractérisé en ce que la caméra (120) comporte une interface de communication (122), de préférence avec un mode de lecture et d'écriture, pour l'échange de données, de préférence sans fil, avec au moins un autre dispositif numérique, en particulier dans un environnement cyber-physique.
  6. Guide de barre (220) selon la revendication 5,
    caractérisé en ce que
    le dispositif numérique est un module (140) d'évaluation de l'image capturée ; et en ce que
    l'interface de communication (122) est conçue pour transmettre l'image capturée par la caméra (120), de préférence sans fil, au module (140) d'évaluation des images capturées, en particulier lorsque le module est disposé à distance de la caméra (120).
  7. Guide de barre selon au moins l'une des revendications 5 ou 6,
    caractérisé en ce que
    le dispositif numérique est une mémoire de données numériques (252), par exemple conçue sous la forme d'un nuage et/ou sous la forme d'une mémoire de données décentralisée agencée sur un segment de guidage de barre (225) ; et
    l'interface de communication (122) est conçue de façon à transmettre l'image capturée par la caméra (120), de préférence sans fil, à la mémoire de données (252) en vue de son stockage.
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)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BY20170350 2017-09-19

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Publication Number Publication Date
EP3456436A1 EP3456436A1 (fr) 2019-03-20
EP3456436B1 true EP3456436B1 (fr) 2023-11-08

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EP18194726.8A Active EP3456436B1 (fr) 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

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Family Cites Families (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

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