EP2885630A1 - Inspection de l'intérieur de récipients par le bas à travers le fond - Google Patents

Inspection de l'intérieur de récipients par le bas à travers le fond

Info

Publication number
EP2885630A1
EP2885630A1 EP13749981.0A EP13749981A EP2885630A1 EP 2885630 A1 EP2885630 A1 EP 2885630A1 EP 13749981 A EP13749981 A EP 13749981A EP 2885630 A1 EP2885630 A1 EP 2885630A1
Authority
EP
European Patent Office
Prior art keywords
container
hollow body
inspection device
camera
inspected
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.)
Withdrawn
Application number
EP13749981.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Schorn
Carsten Buchwald
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.)
KHS GmbH
Original Assignee
KHS 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 KHS GmbH filed Critical KHS GmbH
Publication of EP2885630A1 publication Critical patent/EP2885630A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9072—Investigating the presence of flaws or contamination in a container or its contents with illumination or detection from inside the container
    • 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
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • 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
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9054—Inspection of sealing surface and container finish
    • 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
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9081—Inspection especially designed for plastic containers, e.g. preforms

Definitions

  • Container inside inspection from below through the container bottom
  • the invention relates to an inspection device for checking containers according to the preamble of claim 1, wherein the inspection device comprises at least one transport path and at least one illumination unit, a camera and an optical structure, and wherein a rotatable about a central axis mounted, transparent hollow body is provided, which is arranged below a container to be inspected.
  • Containers according to the invention are, for example, bottles, cans, tubes, pouches, each made of glass and / or plastic, for example PET bottles, but also other packaging materials, in particular those which are suitable for filling liquid or viscous products.
  • EP 0 894 544 A discloses an inspection machine in which the containers, here bottles, are suspended by means of a lighting unit.
  • the lighting unit itself is a quasi-shaped block that transilluminates the containers from below. In principle, these devices are proven and suitable, need only be cleaned relatively often to ensure safe operation and meaningful readings.
  • EP 2 229 582 A1 discloses an inspection device for checking containers, in particular bottles, which comprises at least one transport path for feeding and discharging the containers, a lighting unit, an optical measuring unit and a control unit, wherein the lighting unit is mounted so as to be rotatable about the central axis and transparent hollow body is enclosed and the hollow body is driven by a motor directly or via suitable active compounds.
  • the hollow body is a tube made of a material or mixture of materials which is transparent to radiations of optical-visible, infrared and / or ultra-violet wavelengths, the material being at least partially permeable to these radiations.
  • This inspection device has proven itself in practice, with the camera, however, an internal inspection is carried out from above through the mouth of the container towards the ground. In such an embodiment, however, not all interior areas of the container, in particular the bottle, can be inspected, as shown, for example, by FIG. 1, which will be discussed below, so that not all faults or impurities F1 and F2 can be properly detected.
  • an inspection device with the features of claim 1, wherein the optical structure relative to the rotatable, transparent hollow body is rigidly disposed within the same so that the container to be inspected by means of at least one camera through the container bottom in the direction of Mouth opening are inspectable.
  • the invention thus provides an inspection device with which the containers, preferably bottles, are inspected from below through the closed bottom. In this way, the previously non-inspectable areas become accessible to the inspection device, so that a reliable and reliable statement regarding the inspection result is possible.
  • the lighting unit irradiates the container from the outside with light, with area lighting can be used.
  • errors in the inner side wall of the container or the bottle can be detected.
  • a ring light illumination is possible, which irradiates the container from below, so as ground fault to be able to detect, wherein the lighting unit is then arranged meaningful manner within the hollow body.
  • the lighting units or light sources may differ in their emitted light colors. It makes sense to inspect the floor in the so-called dark field method, which is why the lighting unit within the hollow body is designed accordingly.
  • the side wall inspection by means of the area lighting can be carried out in the so-called transmitted-light method.
  • the at least one illumination unit is arranged within the rotatable, transparent hollow body, wherein expediently an embodiment is available as ring light illumination, which concentrically surrounds the optical axis of the optical structure.
  • the lighting unit is equally rigidly disposed within the hollow body, as the optical structure.
  • the optical structure has lens and mirror systems.
  • the mirror system (s) may also have semipermeable mirrors.
  • the camera (s) can still be preceded by optical filters, for example for the selection of specific wavelengths, colors or spectra thereof.
  • the optical structure is arranged so that its optical axis is arranged parallel or at times congruent to the central vertical axis of the container to be inspected.
  • the containers are continuously transported past the optical structure, so that its optical axis at a certain transport position is congruent otherwise parallel to the vertical axis of the container.
  • the container to be inspected is transported around its vertical axis in a rotating manner along the axial transport direction, which can be achieved, for example, with laterally arranged transport elements or lifting belts which have a different speed relative to one another, so that axis is rotated.
  • the mirrors or by means of the semitransparent mirror the optical beam path can be redirected, which is known per se.
  • An inspection from below means in the sense of the invention that the optical structure arranged rigidly in the hollow body is arranged below the container to be inspected, wherein mirrors or semitransparent mirrors redirect the beam path.
  • a camera with its optical axis can be congruent to a rotational axis of the hollow body.
  • the camera can be arranged laterally next to the hollow body.
  • the camera can also be arranged directly below the hollow body.
  • two cameras can be provided, of which a camera with its optical axis is congruent to the axis of rotation, wherein the second camera is disposed directly below the optical structure, but outside the hollow body.
  • a semitransparent mirror is then used, which redirects the beam path to the laterally arranged camera and at the same time allows the bottom of the camera passes.
  • the rotatable, transparent hollow body is in a preferred embodiment of a plastic, e.g. made of PTFE or acrylic glass or tempered glass, the materials are of course to be mentioned only as an example.
  • the target is when the hollow body, which can also be referred to as a glass cylinder is self-cleaning, what purpose convenient cleaning units can be used.
  • An improvement of the inspection device is that between the hollow body and the top of the lighting unit or the ring lighting a diffusion element is arranged, which leads to a homogenization of lighting means.
  • the upper side of the lighting unit is to be understood as that side which faces the inspecting container or the bottle to be inspected and via which the radiation takes place.
  • the underside is the corresponding counterpart.
  • the diffusion element may basically have a flat, planar shape, but it has been found that it is advantageously arched and arranged between the hollow body and the upper side of the illumination element, the materials and the manufacturing processes for such diffusion elements being known in principle. Zielen the diffusion element can be designed annular.
  • a further improvement of the inspection device can be achieved if a polarization filter is provided, which is ideally arranged between the hollow body and the upper side of the illumination unit and advantageously also has a curved but also annular shape.
  • polarization filters or circular polarizing filters for inspection machines is known and is used, for example, to achieve reliable detection of transparent solids, such as foils, in the container.
  • Suitable polarizing filters consist, for example, of a film of polyvinyl alcohol, which can be mechanically stabilized by means of a double-sided coating of a cellulose acetobutyrate.
  • Other materials are basically known and can be used depending on the application.
  • a cleaning unit can be arranged on the inspection device, which is ideally arranged below the illumination unit but outside the beam path of the optionally below arranged camera.
  • This cleaning unit may further comprise a feeding device.
  • the feeding device has outlets or nozzles for illuminating the outer surface of the hollow body and is suitable for gaseous or liquid media.
  • the cleaning unit comprises at least one pick-up device, the mechanical scrapers in the form of brushes, sealing lips a flexible material or suction elements to remove solid or liquid adhesions from the surface of the hollow body.
  • the adhesions are conveyed permanently or sequentially from the upper side, ie out of the inspection field, in the direction of the lower side.
  • the optionally arranged underneath camera is not present without taking into account the measuring and inspection process to take any suitable and required wet and / or dry cleaning done.
  • the cleaning unit is arranged offset in the peripheral portion outside the beam path of the camera or the optical structure.
  • the rotating hollow body of the inspection device may be open on at least one side for reasons of heat generation and for the power supply. In this way, deposits can reach the inner surface and be conveyed into the inspection field.
  • An improvement therefore consists in that the cleaning unit protrudes on or into the hollow body such that at least solid or liquid adhesions can be removed from the outer surface of the hollow body and, ideally, can also be removed from the inner surface.
  • a cantilever arm which has suitable wipers protrude into the interior and there do cleaning work.
  • the hollow body is also closed on the front side and connected to a gas line via which an inert gas, in particular compressed air, can be conducted into the interior of the hollow body during normal operation.
  • an inert gas in particular compressed air
  • the end faces are also transparent.
  • Defects on the container bottom or on the bottom of the bottle can be detected with the invention, which are difficult to detect in an inspection from above, that is to say in the case of a camera wire path through the outlet opening in the direction of the ground in the pure transmitted light method.
  • PET cracks, the age and wear of the container as well as soil corrugations and embossings can be recognized with the invention.
  • defects that could not be inspected during an inspection from above through the narrow region of the orifice due to the resulting beam path become visible. This applies in particular to the neck and shoulder area of the container or the bottle.
  • Next can be recognized with the inventionaugened so that they can be clearly excluded from a fault image.
  • the invention thus comprises a method for inspecting containers, comprising at least one or more lighting units and at least one camera, the camera being directed from below onto the bottom of the container. This can be done directly or via suitable mirrors. It is essential that the beam path of the camera takes place through the container bottom in order to detect the inner surface of the container (2), for the detection of dirt, defects or the like.
  • the container is ideally transported hanging by being clamped to lateral transport baths or fixed and guided in the neck area by means of a gripper or clamp.
  • this inspection method is performed with an inspection device according to one of the aforementioned embodiments.
  • FIG. 1 shows an inspection according to the prior art. The invention will be explained in more detail below with reference to the figures of an embodiment. Show it:
  • FIG. 3 the inspection device of Figure 2 in a plan view
  • Fig. 5 is a manufactured by means of the inspection device
  • Fig. 6 is a manufactured by means of the inspection device
  • FIGs 7a and 7b which show images of the container bottom, which was created by means of an inspection device according to Figure 1 (prior art).
  • FIG. 1 shows an inspection process according to the prior art, in which an optical structure 1 is used to inspect a container 2 through a mouth opening 3 in the direction of the container bottom 4. It can be seen on the basis of the beam path 5 drawn in principle that shoulder areas 6 and neck areas 7 can not be inspected. In this respect, the inspection according to the prior art involves the risk of an insufficient inspection result.
  • the defects and impurities (F1, F2) in the local areas are shaded.
  • Figure 2 shows an inspection device 8 according to the invention in side view, wherein the inspection device 8 is shown in Figure 3 in a plan view.
  • the inspection device 8 comprises at least one transport path 9 and has at least one illumination unit 10, a camera 12 and the optical structure 1.
  • the optical structure 1 is arranged rigidly within it so that the containers 2 to be inspected can be inspected by the at least one camera 12 through the container bottom 4 in the direction of the mouth opening 3.
  • the optical structure 1 within the hollow body 13 has lens systems 15, and mirror 16.
  • the mirror 16 is advantageously designed as a semitransparent mirror.
  • the hollow body 13 has a drive shaft 17 on which a drive engages in a suitable manner.
  • a first camera 12 Congruent to the central axis X, a first camera 12 is arranged with its optical axis.
  • the laterally arranged camera 12 is arranged below a zenith 14 of the hollow body 13.
  • a second camera 12 In the drawing plane below the hollow body 13, a second camera 12 is arranged, which coincides with its optical axis parallel or at times congruent to the vertical axis Y of the inspected decorating container 2 is.
  • the cameras 12 are each assigned optical filters 11.
  • a field diaphragm 18 is still arranged between the lens systems 15.
  • two illumination units 10 are provided, of which one illumination unit 10a is arranged within the hollow body 13.
  • the other lighting unit 10b is arranged outside the hollow body 13.
  • the arranged inside the hollow body 13 lighting unit 10 is designed as a ring light 10a, which summarizes the optical structure 1 concentrically.
  • the ring light illumination 10a is expediently arranged rigidly within the hollow body 13.
  • rigid means that the hollow body 13 rotates about its axis of rotation X or about its central axis X, while the optical structure 1 and the ring light illumination 10a do not rotate. In this respect, the hollow body 13 rotates relative to the optical structure 1 and the ring light illumination 10a.
  • the exterior illumination unit 10 is designed as area illumination 10b. Both cameras 12 can be accommodated in a preferably transparent housing.
  • the container 2 or the bottle 2 is located on a conveyor belt 20, which conveys the container 2 or the bottle 2 in the direction of arrow 19.
  • the container 2 or the bottle 2 is already in the effective range of vertical lifting straps 21 and directly in front of or already partially over a gap 22 formed between the conveying conveyor 20 and the conveying conveyor belt 23.
  • Under this gap 22 is the schematically illustrated hollow body 13, which includes the ring light illumination 10b and the optical structure 1.
  • the laterally arranged camera 12 is also recognizable.
  • the container 2 is hovered past the optical unit 1.
  • the endlessly circulating, laterally arranged lifting straps 21 are driven at different speeds, so that the container 2 located in the effective region of the lifting straps 21 rotates about its central vertical axis Y.
  • the shoulder region 6 and the neck region 7 can also be inspected on the basis of the inspection from below.
  • the hollow body 13 which may also be referred to as a glass cylinder, may still be arranged a cleaning unit.
  • a surveillance camera can be provided which, for example, inspects the outer circumference of the hollow body and, if necessary, generates a signal for the necessary cleaning, which is forwarded to the cleaning unit via a control unit.
  • the viewing angle ie in the case of the opening angle of the objective also has an influence on the "reflection image". With fixed focal length the opening angle is constant, whereas with zoom lenses the opening angle is changeable, thus zooming in zooming in or out, so that a picture size change results.
  • the inner diameter of the hollow body 13, that is to say the free passage or rather the inactive lighting part in the lighting unit designed as ring illumination 24, is ideally chosen to be at least as large or even slightly larger depending on the bottle bottom curvature. Otherwise, it may be that's reflected fletationen from the ring illumination 24 in the interior of the smooth bottom region than Re- the lighting means such as LED. However, this smooth / curved area from the container bottom 4 should remain dark / black due to the required contrasts for the purpose of fault detection.
  • FIG. 5 to 7 show real images of the container inner wall and the container bottom, wherein Figures 5 and 6 were made with the aforementioned inspection device and Figures 7a and 7b were made by means of an inspection device known in the art. For better illustration, the reference lines were designed as black and white double arrows, which, however, point to the same feature.
  • the container 2 shown in Figure 5 has two embossings.
  • a Halsembos- sing 25 and a Bauchembossing 26 which are arranged on the container 2 in 180 ° offset positions.
  • F1, F2 the two faults or soiling
  • FIG. 5 the relative position of the two embryo bosses 25, 26 relative to each other or to the container seam 28 can likewise be seen in sharp contrast. This makes it possible to inspect and monitor them, for example with regard to their position relative to each other or the size.
  • the device allows this inspection in combination with the defect inspection or solely for embossing or suture control.
  • this data can advantageously be transmitted to a downstream unit or a processing machine, for example to control the required direction for an angular rotation for a subsequent alignment in connection with a labeling .
  • the holding straps 21 or another suitable carrier element can be accelerated or slowed by means of this data for the angular position of the embossings such that the containers 2 are released from the straps 21 in a desired orientation.
  • the container seam 28 can be seen as a shadow line.
  • FIG. 6 shows the ground control in parallel or offset by milliseconds in a dark-light method. Good to see is a broken piece 27 and the sharp contoured bottom ring 29. The shape of the bottom ring 29 and its surface geometry is so well displayed and recorded that this can even be used as a measure of the degree of wear of a container 2. This means that if the pattern is lost or changed, the container 2 can be discarded.
  • the device is also ideally suited for detecting embossing and markings which are arranged very close to the bottom rim, as for example play with markings that are made only for quality assurance reasons, but which should not affect the appearance of the container.
  • the inspection device is ideally suited to grasp and evaluate the axial symmetry of the entire bottle, such as the position of the mouth opening 3 to the center of the container bottom or the center seam of a plastic bottle, as in a PET bottle, to the mouth opening 3 or the position the bottom middle seam of a plastic bottle to the other container bottom or bottom ring 29.

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

Abstract

L'invention concerne un dispositif d'inspection (8), comprenant au moins une ligne de transport (9) et comportant au moins un module d'éclairage (10, 10a, 10b), une caméra (12) ainsi qu'un ensemble optique (1), par exemple un miroir. Un corps creux (13) transparent, supporté de manière à pouvoir tourner sur un axe (X), est disposé en dessous d'un récipient (2) à inspecter de telle façon que l'ensemble optique (1) se trouve à l'intérieur du corps creux (13) transparent pouvant tourner, en position fixe par rapport à ce dernier, afin de pouvoir inspecter les récipients (2) à inspecter au moyen de la ou des caméras (12) à travers le fond (4) des récipients en direction de leur goulot (3).
EP13749981.0A 2012-08-20 2013-08-08 Inspection de l'intérieur de récipients par le bas à travers le fond Withdrawn EP2885630A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012016342.8A DE102012016342A1 (de) 2012-08-20 2012-08-20 Behälterinneninspektion von unten durch den Boden hindurch
PCT/EP2013/002382 WO2014029470A1 (fr) 2012-08-20 2013-08-08 Inspection de l'intérieur de récipients par le bas à travers le fond

Publications (1)

Publication Number Publication Date
EP2885630A1 true EP2885630A1 (fr) 2015-06-24

Family

ID=48986077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13749981.0A Withdrawn EP2885630A1 (fr) 2012-08-20 2013-08-08 Inspection de l'intérieur de récipients par le bas à travers le fond

Country Status (7)

Country Link
US (1) US9541506B2 (fr)
EP (1) EP2885630A1 (fr)
CN (1) CN104662411B (fr)
DE (1) DE102012016342A1 (fr)
MX (1) MX339523B (fr)
RU (1) RU2594604C1 (fr)
WO (1) WO2014029470A1 (fr)

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JP6518911B2 (ja) 2015-05-19 2019-05-29 キリンテクノシステム株式会社 容器検査装置及び検査方法
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JP6761377B2 (ja) * 2017-06-07 2020-09-23 株式会社 日立産業制御ソリューションズ 異物検査装置及び方法
DE102018126865A1 (de) * 2018-10-26 2020-04-30 Krones Ag Vorrichtung und Verfahren zum Inspizieren von Behältnissen
CN110470234B (zh) * 2019-07-24 2021-09-21 楚天科技股份有限公司 一种灯检机摆动间隙的检测方法及灯检机
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Also Published As

Publication number Publication date
DE102012016342A1 (de) 2014-05-15
WO2014029470A1 (fr) 2014-02-27
CN104662411A (zh) 2015-05-27
RU2594604C1 (ru) 2016-08-20
MX2015002202A (es) 2015-05-08
MX339523B (es) 2016-05-30
US9541506B2 (en) 2017-01-10
CN104662411B (zh) 2017-06-06
US20150308964A1 (en) 2015-10-29

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