WO2020064936A1 - Dispositif ainsi que procédé pour la détermination d'une longueur de recouvrement de deux extrémités de matériau d'un objet apte à un mouvement circulaire, et utilisation du dispositif - Google Patents

Dispositif ainsi que procédé pour la détermination d'une longueur de recouvrement de deux extrémités de matériau d'un objet apte à un mouvement circulaire, et utilisation du dispositif Download PDF

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Publication number
WO2020064936A1
WO2020064936A1 PCT/EP2019/076042 EP2019076042W WO2020064936A1 WO 2020064936 A1 WO2020064936 A1 WO 2020064936A1 EP 2019076042 W EP2019076042 W EP 2019076042W WO 2020064936 A1 WO2020064936 A1 WO 2020064936A1
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WO
WIPO (PCT)
Prior art keywords
image
carrier means
imaging area
carrier
designed
Prior art date
Application number
PCT/EP2019/076042
Other languages
German (de)
English (en)
Inventor
Frank Schäfer
Michael Bach
Peter Fritz
Eugen WÄCHTER
Original Assignee
Cst Gmbh
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 Cst Gmbh filed Critical Cst Gmbh
Publication of WO2020064936A1 publication Critical patent/WO2020064936A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3007—Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the drum axis and joining the ends to form an annular element
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • G06T7/001—Industrial image inspection using an image reference approach
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/50—Depth or shape recovery
    • G06T7/55—Depth or shape recovery from multiple images

Definitions

  • the invention relates to a device and a method for determining an overlap length of two material ends of a circularly movable object.
  • Form overlap length greater than zero If the material strip is shorter than a circumferential length of the building drum, the two material ends are arranged at a distance from one another which is free of material strips, in which case there is an overlap length of less than zero.
  • the two material ends run parallel to each other. However, it is also conceivable that they run in a tilted manner with respect to one another and / or are turned over or folded at the end. Previous devices do not form and capture these special cases in a satisfactory manner.
  • a known chain of elements for determining overlap length thus comprises a high-precision rotary encoder or a proximity sensor for detecting the position of the building drum by means of a mechanical signal and for generating and sending a corresponding electrical signal to a camera, and the high-precision camera for generating three-dimensional images of the overlap.
  • a period of time between the detection of the mechanical signal and the exposure of the camera sensor usually should be kept as small as possible.
  • This period of time can also be referred to as jittering and describes a temporal clock jitter during the transmission of signals and a slight fluctuation in accuracy in the transmission clock. With the shortening of this period, the cost of the corresponding devices increases due to necessary precision requirements.
  • DE 10 2008 038 316 A1 already describes that a distance measure between a start and an end of a material strip wound in a tangential direction on a body can be determined by covering a start and end of the wound material strip in the tangential direction Height profile of a surface of the material strip is created. If a position value of the beginning of the material strip is determined in the created height profile, the distance measure can be determined using this position value and the height profile covering the end of the material strip.
  • DE 10 2012 016 587 A1 also already describes a method for splicing control in the production of green tires.
  • a strip-shaped tire building material is placed on a drum. The beginning of the tire building material is determined. During the
  • the tire building material is moved under a laser source, the laser source projecting a light surface onto the tire building material.
  • a camera aimed at the light surface determines the height profile (H) of the surface of the tire building material, which is evaluated by means of a computer.
  • the invention is therefore based on the object of overcoming the problems of the prior art, in particular to provide an inexpensive device which does not require the highest precision and which is nevertheless designed for the exact determination of an overlap length of two material ends of a circularly movable object.
  • the invention is based on the idea that the specific measurement of a surface profile to record a frontal impact, a positive overlap or a negative overlap, as well as the use of high-precision equipment required for this purpose, can be dispensed with by creating images of the two material ends and superimposing them congruently. From this congruent overlap, an overlap length can now be measured in a software-assisted or manual manner.
  • a device for determining an overlap length of two material ends of a circularly movable object comprising a carrier means, designed for carrying and moving the object in circular fashion, a position detection means, designed for detecting a position of the carrier means, an image detection means, designed for detecting a first image a relevant imaging area, in which a first material end of the object can be arranged, at the time of a first position of the carrier means, and for capturing a second image of a relevant imaging area, in which a second
  • Material end of the object can be arranged, at the time of a second position of the carrier means, a control means, designed for congruent superimposition of the first image and the second image with the aid of a reference present in the imaging area for creating an image stack and for measuring one
  • the reference originates from or is identified in the first and second image or image of the object itself. So no marking or the like is made or arranged neither outside nor in or on the object. Instead, the image contents of the images of the object itself form the reference.
  • the workload in the context of the use of the device according to the invention is significantly reduced, since no arrangement and removal of additional markers is necessary.
  • control means are also designed to recognize and / or identify one and the same reference as the image content of the first and second image of the object.
  • Known image recognition and / or processing processes and devices can be used for this purpose.
  • Circular is understood to mean that there is a cyclical movement. This circular movement can be realized, for example, by a building drum or else in a belt device that moves the object in the manner of a conveyor belt.
  • the object can be, for example, a material web, preferably a raw material for a tire ply.
  • the object can be arranged in a known manner on the carrier means in order to wind it up.
  • the image capturing means which can be a matrix camera, recorded a first two-dimensional image which shows the first material end of the object.
  • This first image can be transmitted to the control means.
  • the carrier means then rotates in the winding direction, the position detection means, when the carrier means rotates, sending a signal either to the control means for actuating the image capture means or directly to the image capture means in order to record a second two-dimensional image.
  • This second image shows the second material end of the object and possibly the first material end.
  • the highest precision requirements do not have to be placed on the position detection means, since the angle window for image acquisition does not have to be determined exactly.
  • the second image can also be transmitted to the control means.
  • a reference to the object can be, for example, a characteristic surface profile or a surface structure. Other optically detectable and / or recognizable, in particular Automatically recognizable object properties can be used as object-inherent references.
  • the control means can be designed to use the light line. It is conceivable that the light section method is used here.
  • the control means can then mark the recognized edges and measure the distance between the two material ends of the circularly movable object in the stack of images in order to determine an overlap length.
  • the control means can be designed to measure a plurality of distances between edges of the material ends parallel to the direction of rotation of the carrier means. In this way, for example, a tilted course to one another can be determined.
  • the control means can determine a material thickness on the basis of the light line and thus recognize an end turn or a kink.
  • the result of the measurement can be "zero”, in which case the two ends of the material meet on the front.
  • the result of the measurement can also be “positive”, in which case the two material ends overlap, or the second material end rests on the first material end.
  • the result of the measurement can, however, also be “negative”, in which case the two ends are spaced apart from one another without material strips and form a negative overlap.
  • the detection of the material ends or edges and a check of the material thickness can also take place, for example, by means of a known light section method with which a material end thickness is used checked and / or edges or material ends can be found.
  • the light line generating means can project a stripe projection onto the object in a known manner. It is conceivable that a row signature is assigned to each picture, which clearly defines the first picture and the second picture as such.
  • the control means can easily recognize the first material end in the image stack, which can form the starting point of the measurement.
  • the position detection means is designed as a trigger.
  • a trigger can be designed as a proximity sensor.
  • the carrier means is a building drum or a belt device.
  • a building drum is commonly used in tire manufacturing and is used for concentric and coaxial building of a green tire.
  • a belt device is understood to be a device which comprises at least two deflection rollers via which a belt-like material can be conveyed cyclically.
  • the light line generating means is an LED projector.
  • laser projectors are usually used, which project a laser line as a light line into the imaging area.
  • the laser projector does not emit an actual line but an elongated point cloud, formed from so-called laser speckles. These individual points must first be recorded and offset into a line. If this laser line from the If control means is recognized at all, additional computing power is therefore required to process the light line in a usable manner.
  • an LED projector creates an actual closed line that is easily recognizable and can be processed by the control means without additional computing power.
  • the device used does not have to be sorted into a laser protection class or a protection class which is considerably lower than that of known systems can be used for photobiological safety, as a result of which considerable safety measures can be dispensed with.
  • the device comprises at least two image capturing means, preferably three image capturing means, which are arranged adjacent to one another and transversely to the direction of rotation of the carrier means.
  • image capturing means preferably three image capturing means, which are arranged adjacent to one another and transversely to the direction of rotation of the carrier means.
  • Limiting factors here are, for example, the illuminance, the resolution of the image capturing means or the extent of the carrier means.
  • the multiple image capturing means then capture several first and several second (partial) images per position and transmit these to the control means. This can assemble or stitch the multiple first and multiple second (partial) images into a first and a second image.
  • a method for determining an overlap length of two material ends of a circularly movable object comprising at least the following steps:
  • the method according to the invention essentially has the advantages of the device, to which reference is hereby made.
  • the image capturing means only captures the first image and the second image.
  • image capturing means are known which continuously produce series recordings, it being possible to select images from this series to measure an overlap.
  • the random creation of images is superfluous. This leads to a significantly reduced storage space requirement and a significantly lower need for calculation resources.
  • Such an embodiment is particularly suitable for material edges that run largely parallel to one another.
  • the circular movement of the object through the carrier means from a first position to a second position of the carrier means is only one complete revolution of the carrier means.
  • the second position is formed by an angular range from 337.5 ° to 382.5 ° in relation to a zero position defined by the first position.
  • An angle window of 45 ° width is thus selected, in which at least one image capturing means takes serial images.
  • This embodiment is particularly suitable for tilted material edges. If there is no material edge on these pictures, they will be discarded.
  • Fig. 1 is a schematic view of the invention
  • FIG. 2 shows a schematic view according to FIG. 1 with the carrier means in a second position
  • Fig. 4 shows a detail from Fig. 3 with two material ends of the
  • FIG. 5 shows a detail similar to Fig. 4 with two material ends of the
  • Object in push position, 6 shows a detail similar to FIG. 4 with two material ends of the object in a negative overlap position
  • Fig. 7 is a schematic view of the invention
  • Fig. 8 composite second images.
  • the device 2 comprises a build-up drum 4, through which a rotation axis 6 extends, about which the build-up drum 4 rotates in the direction of rotation 8 for winding a material web 10.
  • a trigger element 12 is arranged for a trigger 14 immovably mounted relative to the building drum 4.
  • the trigger element 12 and the trigger 14 are parts of a trigger device or a proximity sensor.
  • the trigger 14 registers a rotation of the building drum 4 by 360 ° compared to a previous approximation.
  • the trigger 14 is connected via cable to a control means 18 via a data line 16. However, it can also be connected wirelessly to the control means 18.
  • an image capturing means 20 Arranged in the periphery of the building drum 4 is an image capturing means 20 which is aligned with the building drum 4 such that a first material end 22 of the material web 10 lies in an imaging region 26 of the image capturing means 20 at the time of a first position of the building drum 4 (see FIG. 1 ) and such that at least a second material end 24 (see FIG. 2) of the material web 10 at the time of a second position of the building drum 4 in the imaging area 26 of the image capture means 20.
  • the image capturing means 20 is connected to the control means 18 via a data line 32.
  • a light line generating means in the form of an LED projector 28 is arranged in relation to the building drum 4 such that its emitted light line pattern 30 shines in the direction of the direction of rotation 8.
  • the emission direction of the light line pattern 30 and the viewing direction of the image capturing means 20 can preferably be oriented at right angles to one another.
  • the LED projector 28 is connected to the control means 18 via a data line 34.
  • a drive motor of the building drum 4 can also be connected to the control means 18 via a data line.
  • the material web 10 can have colored markings 36 which serve as an optical reference.
  • the markings 36 are part of the material web 10 and are not only attached or arranged for marking purposes. Alternatively, characteristic optical image contents or the material web itself can serve as marking 36.
  • the first material end 22 of the material web 10 is arranged in a known manner, at least temporarily, in a rotationally fixed manner on a peripheral surface of the building drum 4.
  • the control means 18 immediately causes the acquisition of a first image 38 of the relevant imaging area via the data line 32, in which the first material end 22 of the material web 10 is arranged.
  • the light line pattern 30 can either be designed to be permanently emitting or can only be switched on for each image recording. It is conceivable that the control means 18, together with the signal for acquiring an image, also transmits a signal to the LED projector 28 via the data line 34 to emit the light line pattern 30. In this case, the light line pattern 30 is also only for the period broadcast when the picture was taken.
  • the first image 38 captured by the image capturing means 20 is transmitted to the control means 18 via the data line 32.
  • the building drum 4 continues to rotate about the axis of rotation 6 in the direction of rotation 8.
  • the trigger 14 detects this full revolution and transmits a proximity signal to the control means 18 via the data line 16.
  • the control means 18 causes a second image 40 to be recorded.
  • the material web 10 has wrapped around the circumference of the material drum 4.
  • the second image 40 can also be transmitted to the control means 18 via the data line 32.
  • a row signature is assigned to each of the two images 38 and 40, which clearly defines the first image 38 as the first image and the second image 40 as the second image.
  • the control means 18 now, as described above, detects edges of the material web ends 22 and 24 and marks them. The control means 18 then congruently overlaps the two images 38 and 40, as shown in FIG. 3. In pictures 38 and 40 and in the Imaging area 26 of the image capturing means 20, the material web 10 can be seen with colored markings 36. In addition, the light line pattern 30 is visible in the images 38 and 40.
  • the imaging area 26 is an area that is defined or determined by the optical properties of the image capturing means 20. For the sake of clarity, the imaging area is shown in FIGS. 1 and 2 only on the basis of two boundary lines of the actually four or more boundary lines.
  • control means 18 equalizes the two images 38 and 40, for example to compensate for the curved structure of the building drum 4.
  • images 38 and 40 may be barrel-shaped, i.e. all lines that do not run through the middle are bent outwards.
  • control means 18 checks the two images 38 and 40 for identical structures.
  • the colored markings 36 are therefore recognized by the control means 18 as identical structures and can thus serve the control means 18 as anchor points.
  • Surface structures 44 can also be identical structures.
  • the two images 38 and 40 are superimposed congruently, that is to say that the identified identical structures overlap directly, as indicated by arrows of a reference coverage 42.
  • the superimposition can include tilting about an axis parallel to the axis of rotation 6 and / or tilting about an axis orthogonal to the axis of rotation 6 and / or rotating about a normal axis in the image plane and / or a side length reduction and / or a side length extension and / or a shift along the axis parallel to the axis of rotation 6 and / or Moving along the axis orthogonal to the axis of rotation 6 and / or moving along the normal axis in the image plane.
  • the two pictures 38 and 40 are superimposed congruently.
  • the control unit 18 can completely hide one of the two images in order to recognize an end edge of a material end 22, 24 of the material web 10. After recognition, this image is faded out and the previously faded out image is faded in, in order to recognize at least one material edge of the other material end 22, 24 of the material web there too.
  • the light section method can be used since the surface of the material web 10 also serves as a reference.
  • the edge search is carried out by means of a search for a characteristic jump in the light line pattern 30.
  • the material edges of the material ends 22, 24 are also recognizable thereby. Since the individual images 38 and 40 are provided with a series signature, it is known which of the recognized material edges is that of the first material end 22. Depending on the position of the second material edge, it is now also known whether there is a positive overlap length, a frontal abutment or a negative overlap length.
  • the overlaying image preferably the second image 40, is now faded out 50%, so that both images 38 and 40 are visible in the same way and with the same intensity.
  • the distance between the two detected material edges is automatically measured in the direction of rotation 8 of the building drum 4 by means of the control means 8.
  • FIG. 4 shows a section B according to FIGS. 1 to 3.
  • Fig. 4 also shows a distance L with a positive value, since in this case the two Overlay material ends 22 and 24.
  • the hidden end edge of the material end 22 is shown in dashed lines.
  • FIG. 5 shows a further possibility of aligning the material ends 22 and 24, in which case the length of the distance between the two end edges of the material ends 22 and 24 is “zero”.
  • the two material ends 22 and 24 abut one another on the end face.
  • 6 now shows a third case in which the determined overlap length L has a negative value. In this case, the two material ends 22 and 24 are arranged at a distance from one another that is free of material strips.
  • FIG. 7 shows a further embodiment, similar to FIG. 1, but with two image capturing means 20.
  • a separate imaging area 26 is assigned to each of the two image capturing means 20.
  • the left side of the material web 10 in the direction of rotation 8 and in the plane of the drawing lies in the imaging area 26 (see FIG. 1) of the one image capturing means and the other outer edge of the material web 10 lies in the imaging area 26 of the other image capturing means 20.
  • the building drum 4 is on an exemplary device rotatably mounted in the direction of rotation 8, which device also has the control means 18 and an output unit 46 and an input unit 48. Data exchange with a user 50 is made possible via the output unit 46 and the input unit 48.
  • FIG. 8 shows the second (partial) images 40a, 40b, 40c and 40d generated by the image acquisition means 20 shown in FIG. 7, which are combined by the control means 18 to form a second image 40.
  • a (single) image can now be created using the (partial) images 40a, 40b, 40c and 40d. While images 40a and 40b were captured by imaging means 20, images 40c and 40d created by the other of the two image acquisition means 20. The lines of the light line pattern 30 and the jumps in the lines can be clearly seen in the images 40a to 40d. It can also be seen that the edges of the material ends 22 and 24 are tilted relative to one another.
  • the (part) images 40a, 40b, 40c and 40d transmitted to the control means 18 are checked for their relevance before the linkage by the control means 18.
  • a relevance criterion can be, for example, whether an edge of a material end 22 and / or 24 is depicted in one of the (partial) images.
  • (part) Figure 40a would be rejected because it does not meet the relevance criterion.
  • Figure 40a is shown in composite second image 40 for demonstration purposes only.

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  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Dispositif pour la détermination d'une longueur de recouvrement de deux extrémités de matériau (22, 24) d'un objet apte à un mouvement circulaire, comprenant un moyen de support, conçu pour le support et le déplacement circulaire de l'objet, un moyen de détection de position, conçu pour la détection d'une position du moyen de support, un moyen d'acquisition d'image (20), conçu pour l'acquisition d'une première image (38) d'une zone d'image (26) pertinente, dans laquelle une première extrémité de matériau (22) de l'objet peut être disposée au moment d'une première position du moyen de support, et pour l'acquisition d'une deuxième image (40) de la zone d'image (26) pertinente, dans laquelle une deuxième extrémité de matériau (24) de l'objet peut être disposée au moment d'une deuxième position du moyen de support, un moyen de commande, conçu pour la superposition coïncidente de la première image (38) et de la deuxième image (40) au moyen d'une référence présente dans la zone d'image (26) pour la génération d'un empilement d'images ainsi que pour la mesure d'une longueur de recouvrement de deux extrémités de matériau (24) d'un objet apte à un mouvement circulaire dans l'empilement d'image, et un moyen de génération de lignes lumineuses, conçu pour la génération d'au moins une ligne lumineuse sur l'objet dans la zone d'image (26) pertinente. L'invention concerne aussi un procédé et l'utilisation du dispositif.
PCT/EP2019/076042 2018-09-27 2019-09-26 Dispositif ainsi que procédé pour la détermination d'une longueur de recouvrement de deux extrémités de matériau d'un objet apte à un mouvement circulaire, et utilisation du dispositif WO2020064936A1 (fr)

Applications Claiming Priority (2)

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DE102018123966.1 2018-09-27
DE102018123966.1A DE102018123966A1 (de) 2018-09-27 2018-09-27 Vorrichtung sowie Verfahren zur Ermittlung einer Überlappungslänge zweier Materialenden eines kreisläufig bewegbaren Gegenstandes

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WO2020064936A1 true WO2020064936A1 (fr) 2020-04-02

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DE102020120737A1 (de) 2020-08-06 2022-02-10 Cst Gmbh Verfahren und Vorrichtung zur Überwachung eines, bevorzugt mehrlagigen, Wicklungsprozesses mit einem optischen Kontrollsystem
DE102020120734A1 (de) 2020-08-06 2022-02-10 Cst Gmbh Verfahren und Vorrichtung zur Überwachung eines, bevorzugt mehrlagigen, Wicklungsprozesses mit einem optischen Kontrollsystem
DE102021203199A1 (de) * 2021-03-30 2022-10-06 Continental Reifen Deutschland Gmbh Verfahren zur Prüfung von gravierten Codes auf Oberflächen von Reifenteilen

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EP2613122A1 (fr) * 2010-09-03 2013-07-10 Kabushiki Kaisha Bridgestone Procédé et dispositif pour détecter une forme d'un élément en forme de bande, et capteur de déplacement en deux dimensions
DE102012016587A1 (de) 2012-08-20 2014-02-20 Harburg-Freundenberger Maschinenbau Gmbh Verfahren zur Spleißkontrolle
CN106483136A (zh) * 2016-10-13 2017-03-08 青岛软控机电工程有限公司 带束层缺陷检测方法及系统
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DE3926721A1 (de) * 1989-08-12 1991-02-14 Krupp Maschinentechnik Verfahren zur ermittlung der groesse des spleisses, spleissversatzes bzw. der spleissueberlappung beim aufbau von radialreifen und vorrichtung zur durchfuehrung des verfahrens
JPH095246A (ja) * 1995-06-20 1997-01-10 Mitsubishi Heavy Ind Ltd タイヤ成形機のゴム接合状態監視装置
US5982922A (en) * 1996-02-16 1999-11-09 Mitsui Mining & Smelting Co., Ltd. Pattern inspection apparatus and method
DE102008038316A1 (de) 2008-08-19 2010-03-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Bestimmen eines Abstandsmaßes an aufgewickelten Materialien
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EP2613122A1 (fr) * 2010-09-03 2013-07-10 Kabushiki Kaisha Bridgestone Procédé et dispositif pour détecter une forme d'un élément en forme de bande, et capteur de déplacement en deux dimensions
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CN106483136A (zh) * 2016-10-13 2017-03-08 青岛软控机电工程有限公司 带束层缺陷检测方法及系统

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