EP2092098A1 - Procédé et dispositif de détection et de séparation de substances étrangères - Google Patents

Procédé et dispositif de détection et de séparation de substances étrangères

Info

Publication number
EP2092098A1
EP2092098A1 EP06830019A EP06830019A EP2092098A1 EP 2092098 A1 EP2092098 A1 EP 2092098A1 EP 06830019 A EP06830019 A EP 06830019A EP 06830019 A EP06830019 A EP 06830019A EP 2092098 A1 EP2092098 A1 EP 2092098A1
Authority
EP
European Patent Office
Prior art keywords
material flow
receiving device
radiation
mirror
radiation 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.)
Withdrawn
Application number
EP06830019A
Other languages
German (de)
English (en)
Inventor
Armin Jossi
Andreas Meyenhofer
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.)
Jossi Holding AG
Original Assignee
Jossi Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jossi Holding AG filed Critical Jossi Holding AG
Publication of EP2092098A1 publication Critical patent/EP2092098A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/003—Detection and removal of impurities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material

Definitions

  • the invention relates to a method and a device for detecting and eliminating foreign substances in a pneumatically conveyed material flow of fibrous material according to the preamble of claim 1 and claim 6, respectively.
  • Such devices are primarily used in spinning mills for cleaning raw cotton. This raw cotton can often be interspersed with undesirable for the spinning process foreign matter.
  • Foreign substances are, for example, cords, jute or other tissue shreds, plastic films or metal particles.
  • This object is achieved according to the invention with a method which has the features in claim 1.
  • tion only the directional reflection to generate a separation signal is advantageously used the property of plastic particles, that their surface is formed shiny or specularly reflective. Since cotton and natural impurities such as trash either diffusely reflect or absorb the light radiation, plastic impurities can therefore be detected relatively easily.
  • An excretion signal is generated only with a signal of predetermined duration and intensity, as may be caused only by a directed reflection, wherein for detecting the directional reflection preferably a maximum duration and a minimum intensity is predetermined.
  • the foreign matter can be illuminated at an observation time, for example, by a point light source, wherein the reflections of (eg) cameras can be detected from different directions.
  • a plurality of radiation sources may be provided.
  • the material flow is irradiated at a time of observation only by a radiation source or by a group of radiation sources.
  • the material stream may be alternately irradiated in a predetermined order from radiation sources or groups of radiation sources. In this way it can be ensured that at least one reflection can be detected for foreign substances with almost any orientation of the reflective surface.
  • the foreign matter may be illuminated sequentially, each time being detected by a plurality of receiving devices from different directions. In this case, one or more point light sources can be controlled in different ways. It can be advantageous if a plurality of receiving devices is provided, wherein each receiving device receives an image at the time of observation. This arrangement has the advantage that the detection and separation effect can be significantly increased.
  • the detection of the foreign substances can be done with the help of a camera, in particular a flat or line-like alslosenden black and white camera (B / W camera) or a single sensor.
  • the sensor signals can be evaluated by means of an evaluation unit, which detects a foreign matter when a certain brightness value is exceeded and generates a control signal.
  • an arrangement of radiation source and recording device is provided, which is designed such that the reflected due to irradiation by the radiation source of the foreign substances beam can be detected by the receiving device. In this way, the specular reflection of the glossy surfaces of the foreign substances can be recognized.
  • Each receiving device may be provided with a plurality of radiation sources, which are arranged around the receiving axis of the receiving device.
  • the radiation sources can lie on a plane extending vertically to the recording axis.
  • the radiation sources can preferably be distributed uniformly on a circle or a spherical cap around the receiving axis.
  • Each radiation source may be provided with a plurality of recording devices, which are arranged around the radiation axis.
  • the radiation sources can be placed on a axis of the receiving device vertically extending plane lie.
  • the receiving devices can preferably be distributed uniformly on a circle around the radiation axis.
  • a plurality of receiving devices may be provided, which lie on a vertical plane to the radiation axis.
  • the receiving devices can preferably be arranged distributed uniformly on a circle around the radiation axis.
  • an LED arrangement with a multiplicity of LED lighting elements can be arranged as point light sources (radiation sources) at a distance from the presentation channel.
  • the point light sources can be controlled and activated individually, in groups or as a whole.
  • the device may have a control device for controlling the radiation sources, which is designed such that the radiation sources can be activated individually or in groups in a predetermined sequence.
  • the receiving device may be a camera or an electromagnetic single sensor.
  • each S / W camera is preferably assigned a color camera.
  • the presentation channel and the receiving device can be arranged against the receiving device tapering cone, in particular a glass cone. In this way, unwanted, disturbing reflections can be prevented.
  • the device may comprise a rotatable mirror wheel for scanning the material flow with polygonal mirror surfaces, with which the radiation of the radiation source can be deflected in the direction of the flow of material.
  • a rotatable mirror wheel for scanning the material flow with polygonal mirror surfaces, with which the radiation of the radiation source can be deflected in the direction of the flow of material.
  • each mirror surface of the mirror wheel is provided with a polarization filter, wherein preferably at least two mirror surfaces have polarization filters with different polarization directions and wherein particularly preferably each mirror surface has a polarization filter with different polarization directions.
  • the mirror wheel can be, for example, a five-surface mirror wheel, on which a non-polarizing mirror surface as well as a respective mirror surface with polarization directions 0 °, 45 °, 90 ° and 135 ° would be mounted.
  • Such a mirror wheel can also be used for conventional devices for detecting and separating foreign substances in a pneumatically conveyed material flow of fibrous material, in particular raw cotton, in which, in an observation tion zone with the aid of at least one electromagnetic radiation source of material flow is irradiated, be advantageous.
  • the receiving device could be equipped with at least one polarizing filter.
  • the receiving device can, for example, have beam splitters with the aid of which a beam can be divided. Depending on a split beam may be assigned a single sensor, wherein at least one of the sensors would be equipped with a polarizing filter.
  • FIG. 1 shows a schematic representation of a device as part of a separation plant for cotton fibers
  • FIG. 2 shows a cross section through an arrangement with radiation source and receiving device in a first embodiment
  • FIG. 3 shows a second embodiment of the arrangement with a plurality of radiation sources and a receiving device
  • FIG. 4 shows the arrangement according to FIG. 3 in a further illustration
  • FIG. 5 shows a third embodiment of the arrangement with a light source and a plurality of receiving devices
  • Figure 6 shows a fourth embodiment of the arrangement with two
  • Radiation sources each radiation source are associated with two receiving devices,
  • FIG. 7 shows a further embodiment of the arrangement with a presentation channel containing a glass cone
  • FIG. 8 shows a further embodiment of the arrangement with an LED arrangement and two receiving devices
  • FIG 9 shows a seventh embodiment of the arrangement with a mirror wheel.
  • FIG. 1 shows a device, designated 1, for detecting and separating foreign substances in a pneumatically conveyed material stream of raw cotton.
  • This basic structure known per se consists essentially of an arrangement 2 of radiation source and receiving device, an evaluation unit 5 and a separation device 6 for separating foreign substances from the cotton stream.
  • the arrangement 2, which is arranged in the region of a presentation channel 7, can detect foreign substances.
  • colorless plastic impurities can be detected from the cotton stream in a particularly efficient manner. The operation and the structure of this arrangement will be described in detail in the following figures.
  • the detected foreign substance is later led away via a separating tube 16 or another derivative until it finally reaches a separating container (not shown).
  • the excretion is carried out by way of example by means of compressed air (indicated by compressed air source 17 and control valve 18) either directly by blowing out the foreign substance or by Acting a flapper.
  • compressed air indicated by compressed air source 17 and control valve 18
  • any separation process would be suitable for a material flow which is pneumatically required in a pipe 15.
  • the arrangement according to Figure 2 has a radiation source 3, with which particles of the material flow (the direction of which is indicated by an arrow) are irradiated.
  • the radiation source can be designed as a light source, in particular as a point light source.
  • a radiation source which emits the UV or infrared radiation in particular in the region of so-called “near infrared" (NIR, approximately 800-2,500 nm).
  • NIR near infrared
  • a point light source is selected as the radiation source by way of example.
  • the recording device 4 With the aid of the recording device 4, the beam reflected by the particles as a result of the illumination is detected in an observation zone B.
  • the recording device can be, for example, a B / W matrix camera.
  • electromagnetic (or optoelectronic) sensors are also suitable as recording devices.
  • the detection of the foreign particles by means of the S / W camera or an electromagnetic sensor is effected in that the image divided into pixels is evaluated with the aid of an evaluation unit which detects a foreign substance when a specific brightness value is exceeded.
  • a particle P is sequentially illuminated (stroboscopic effect). This is indicated in Figure 2 with Pl to Pn, where Pn relates to the particle at a time t n .
  • the recording device 4 is advantageously synchronized with the point light source 3 by means of a control unit and is operated such that of the same particle P several shots (ie just Pl .. Pn) are made.
  • the particle P is illuminated from a different direction each time, since the particle shifts from recording to recording with respect to the recording device and the point light source.
  • colorless (white or transparent) plastic impurities can be easily recognized by taking advantage of their shiny surface character.
  • FIGS. 3 and 4 show an arrangement 2 with a receiving device 4 and a plurality of point light sources 3.
  • the cotton material stream is illuminated per shot by one or a group of point light sources, with different point light sources activated for each shot.
  • the recording device 4 for example an S / W camera
  • the recording device 4 is operated in such a way that several pictures are taken of the same particle.
  • the material flow is irradiated at a time of observation only by a radiation source or by a group of radiation sources.
  • the arrangement according to FIG. 3 has the advantage over the arrangement according to FIG. 2 that a larger number of different arbitrary angular positions can be covered.
  • the point light sources 3 are arranged uniformly distributed on a circle K. This circle K lies on a plane which extends vertically to the receiving axis A of the receiving device 4, wherein the center of the circle is predetermined by the axis A.
  • the arrangement 2 can have a plurality of receiving devices 4 and only one single point light source 3.
  • the recording devices 4 are aligned with respect to the observation zone in the presentation channel 7 with respect to the axis of the light cone L of the point light source.
  • Analogous to FIG. arranged receiving devices 4 on a circle, wherein the center of the circle is here, however, given by L.
  • a particle is thus simultaneously recorded by a plurality of (here: four) recording devices at a specific observation time.
  • recording devices for example, S / W matrix or line scan cameras can be used.
  • a plurality of (here: two) point light sources 3 are provided.
  • Each point light source 3 is associated with an S / W camera 4 'and a color camera 4' '.
  • Such a combination of cameras has the advantage that in addition to the detection of plastic impurities and textile contaminants are recognizable (see Fig. 8).
  • a camera is enclosed in the region of the narrow end of a glass cone 9.
  • a glass cone can prevent undesirable reflections and impurities, such as may occur in a disk located between the camera and the transport channel (see, for example, Fig. 2).
  • air-conditioning or other precautions must generally be taken.
  • point light sources can be arranged in an LED arrangement.
  • This LED array denoted by 8 has a plurality of LED lighting elements 3 as point light sources.
  • the advantages of a black-and-white camera and a color camera can be combined with each other.
  • all LED light elements are activated, whereby a surface (diffuse) illumination source arises without interfering shadow effects and reflexes for the color recognition.
  • the LED lighting elements are only individually or possibly groupwise controlled and activated.
  • Optimal detection of plastic contaminants and textile contaminants can be achieved by alternately operating the LED array and synchronized receptacles 4 'and 4 ". That is, at an observation time, the camera 4 'picks up the reflections, and in a subsequent observation time, the camera 4''takes color images.
  • Figure 9 shows an embodiment of an arrangement in which a rotatable mirror wheel is used.
  • Directed light of a point light source 3 (for example of a laser) is guided via a - preferably with the beam path of the associated sensor - beam coupling 19 to the mirror wheel 10 and deflected by a mirror surface 12 in the direction of the present in the presentation channel 7 material flow.
  • a point light source 3 for example of a laser
  • the mirror wheel 10 deflected by a mirror surface 12 in the direction of the present in the presentation channel 7 material flow.
  • a concave mirror 13 and a planar auxiliary mirror can be seen for this purpose, with the aid of which the light beam can be moved almost vertically to the presentation channel 7 at a suitable entry angle.
  • the mirror surfaces 12 are advantageously equipped with differently oriented polarization filters, whereby each observation object (particles) can be observed in succession under different polarization conditions.
  • each observation object particles
  • FIG. 9 a five-surface mirror wheel is shown which can be used with particular preference.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • 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 procédé de détection et de séparation de substances étrangères dans un écoulement de coton brut transporté pneumatiquement, dans lequel l'écoulement de matière est éclairé dans une zone d'observation à l'aide d'au moins une source (3) de lumière ponctuelle. Le procédé est caractérisé en ce que le rayon réfléchi par les substances étrangères suite à l'éclairage est détecté au moyen d'au moins un dispositif d'enregistrement et est converti en un signal de commande au moyen d'une unité d'évaluation et en ce qu'un dispositif de séparation qui sépare des substances étrangères, disposé en aval de la zone d'observation dans la direction du transport, est activé. L'unité d'évaluation est programmée de telle sorte qu'un signal de séparation ne soit formé que pour une réflexion orientée d'une durée et d'une intensité prédéterminées. Dans ce but, plusieurs sources d'irradiation (3) sont prévues et l'écoulement de matière n'est irradié à un instant d'observation que par une source d'irradiation (3) ou par un groupe de sources d'irradiation (3).
EP06830019A 2006-11-16 2006-11-16 Procédé et dispositif de détection et de séparation de substances étrangères Withdrawn EP2092098A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/068552 WO2008058573A1 (fr) 2006-11-16 2006-11-16 Procédé et dispositif de détection et de séparation de substances étrangères

Publications (1)

Publication Number Publication Date
EP2092098A1 true EP2092098A1 (fr) 2009-08-26

Family

ID=38121473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06830019A Withdrawn EP2092098A1 (fr) 2006-11-16 2006-11-16 Procédé et dispositif de détection et de séparation de substances étrangères

Country Status (2)

Country Link
EP (1) EP2092098A1 (fr)
WO (1) WO2008058573A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008031199B4 (de) * 2008-07-03 2024-06-13 Trützschler Group SE Vorrichtung in der Spinnereivorbereitung, Ginnerei o. dgl. zum Erkennen von Fremdteilen aus Kunststoff, wie Polypropylen o. dgl.
DE102008034385A1 (de) * 2008-07-23 2010-01-28 TRüTZSCHLER GMBH & CO. KG Vorrichtung in der Spinnereivorbereitung, Ginnerei o. dgl. zum Erkennen von Fremdstoffen in oder zwischen Fasermaterial, insbesondere Baumwolle
EP2942114B1 (fr) 2014-05-09 2019-02-27 Baumer Inspection GmbH Procédé de reconnaissance de corps étrangers
DE102015118847A1 (de) * 2015-11-03 2017-05-04 TRüTZSCHLER GMBH & CO. KG Vorrichtung zur Fremdteilerkennung in der Spinnereivorbereitung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2129038A1 (de) * 1971-06-11 1972-12-21 Licentia Gmbh Vorrichtung zur Prüfung bewegter Matenalbahnen oder bogen
ATE103069T1 (de) * 1988-10-11 1994-04-15 Rieter Ag Maschf Erkennung von fremdgut in textilfasern.
CH674379A5 (fr) * 1989-05-26 1990-05-31 Hans Juergen Scheinhuette
EP0652432A1 (fr) * 1993-11-04 1995-05-10 BARCO nv/Automation Dispositif de détection des impuretés, notamment des fibres étrangères dans des textiles en mouvement
DE29719245U1 (de) * 1997-10-29 1998-03-12 Jossi Holding Ag, Islikon Vorrichtung zum Erkennen und Ausscheiden von Fremdstoffen in Fasermaterial
DE19939711B4 (de) * 1999-08-21 2015-03-12 Saurer Germany Gmbh & Co. Kg Verfahren und Vorrichtung zur Detektierung von Fremdkörpern in einem längsbewegten Faden

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008058573A1 *

Also Published As

Publication number Publication date
WO2008058573A1 (fr) 2008-05-22

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