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EP2513676A1 - Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande - Google Patents

Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande

Info

Publication number
EP2513676A1
EP2513676A1 EP10784971A EP10784971A EP2513676A1 EP 2513676 A1 EP2513676 A1 EP 2513676A1 EP 10784971 A EP10784971 A EP 10784971A EP 10784971 A EP10784971 A EP 10784971A EP 2513676 A1 EP2513676 A1 EP 2513676A1
Authority
EP
European Patent Office
Prior art keywords
conveyor
belt
belt conveyor
detection device
foreign body
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Withdrawn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
EP10784971A
Other languages
German (de)
English (en)
Inventor
Uwe BÖCKER
Ulrich Binder
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp Foerdertechnik 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 ThyssenKrupp Foerdertechnik GmbH filed Critical ThyssenKrupp Foerdertechnik GmbH
Publication of EP2513676A1 publication Critical patent/EP2513676A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties

Definitions

  • the present invention relates to a detection device and a method for detecting an electrically conductive foreign body in a winninggutstrom a belt conveyor according to the preamble of the respective independent claim.
  • the detection device is either arranged in substantially metal-free areas of the belt conveyor or shielded with appropriate shielding consuming against the Störfeldum imagination.
  • a metal detection device with at least one metal detector with directional effect for the investigation of biowaste bins known.
  • the metal detection device operates in accordance with the so-called pulse induction method, whereby induction pulses are selectively emitted in the direction of the biotube via two transmitter coils arranged in the same plane with the transmitter coil and a received signal influenced by the metal parts possibly present in the biobin is received.
  • pulse induction method whereby induction pulses are selectively emitted in the direction of the biotube via two transmitter coils arranged in the same plane with the transmitter coil and a received signal influenced by the metal parts possibly present in the biobin is received.
  • a thick-walled and one-sided open metal box for receiving the metal detection device is provided.
  • a metal detection device for the detection of metal parts from a winning fabric dielectric materials is known, the baingutstrom is guided between a transmitting coil and two receiving coils and the receiving coils in an alternating electromagnetic field of the transmitting coil, which is acted upon by a predetermined frequency , are arranged.
  • a closed housing is provided which projects over the entire width of the belt conveyor and causes a shielding of the electromagnetic fields. At the bottom of the housing this is closed with a metallic lid, wherein the lid is formed so that it prevents leakage of electromagnetic alternating fields of the transmitting and / or receiving coils to the outside.
  • DE 199 21 224 B4 describes a method for monitoring an endlessly circulating belt of a corresponding belt conveyor.
  • the belt monitoring for damage is carried out using a belt-specific reference signal, the belt to be examined is scanned and recorded over its entire length and the signal is separated according to size of the amplitude, evaluated according to waveform and position assignment in the belt, so that a change in position or damage of Stahlseilzuarri within the belt or on the belt existing metal body (such as a forgotten tool od) are recognizable.
  • the object of the present invention is to specify a detection device for a belt conveyor with metallic components having structure, via which a detection of an electrically conductive foreign body in winningstrom is ensured with the simplest possible technical structure with improved detection reliability.
  • the electrical coil operating as a transmitter coil is controlled via a pulse generator, so that a time-varying primary magnetic field is generated via the pulse induction device formed in this way.
  • the electric coil operating as a transmitter coil can be used such that it temporarily works as a receiver coil instead of as a transmitter coil - in this case a total of two electrical coils would suffice for the provision of transmitter and receiver, at least one of the electrical coils being designed or should be used that they can work both as a transmitter coil and as a receiver coil.
  • at least two designed as a pure receiver coils / working coils also be a separate working exclusively as a transmitter coil further coil.
  • an installation-specific reference signal which is described in more detail below in the context of the second embodiment, can be generated and (for example) stored in the evaluation device.
  • this reference signal which is also "recorded” or detected with the help of at least one of the receiver coils, the properties of the belt conveyor with empty conveyor belt including the effect on the "measuring point" in the environment of the belt conveyor disturbing influences.
  • the properties of the belt conveyor at the (axial) position of the measuring / detecting conveyor belt position to be measured or determined with loaded conveyor belt and the deposited reference signal (the empty conveyor belt) position related to this ratio or subtracted.
  • Detection can be further improved by comparing the so-called signal signature of disturbing bodies in the conveyed material flow, corrected for speed, with stored disturbance reference signals.
  • a foreign body reference signal may be at subsequent Detection cycles (speed corrected) are included in the evaluation such that each detected foreign body is compared with the stored reference foreign body signals and is not closed in the event of a match on a foreign body to be detected.
  • the deposited foreign body reference signals may have to be adapted (speed-adjusted) to the present belt speed by a factor (since the foreign-body reference signals are at a specific conveyor belt speed, which is usually different from the present conveyor belt speed) have been generated).
  • the detection device comprises a pulse induction device for generating a force acting on the winninggutstrom the belt conveyor primary magnetic field (also referred to as the primary field) and an electrical coil and an evaluation device for detecting and evaluating a generated due to the primary field in the foreign body secondary magnetic field (also as Secondary field).
  • the detection device has at least one electrical coil. This then in turn must be designed such that it can temporarily work as a transmitter coil in the context of the generation of the primary magnetic field, and that it can temporarily work as a receiver coil for detecting the secondary magnetic field generated in the foreign body.
  • the evaluation device of the detection device is designed such that the detection of the electrically conductive foreign body in response to a comparison of the metallic environment of the belt conveyor in terms of their disturbing properties on electromagnetic fields reproducing (or correlating) reference signal with a detected by the receiver coil measurement signal he follows.
  • the reference signal is thus to be understood as plant-specific reference signal, wherein at a predetermined axial reference point of the belt conveyor, including the acting on this reference point with disturbing influences on the magnetic fields of the detection device system and environmental parts, the circumferential (also comprising metal parts) conveyor belt scanned over its entire length by the detection device and the generated reference signals (reference signal sequence) in the evaluation as a reference variable (reference signals) is stored (will).
  • the detection device is designed to be self-learning, such that a detected foreign body, which has led to a system stop, can be determined and stored by a corresponding program-technical confirmation of an authorized person as reference foreign body or foreign object reference signal.
  • the new reference body thus learned can thus be treated (depending on the determination) as a foreign body of a certain genus triggering a bandstop or as a foreign body that can be intentionally ignored and does not cause a bandstop.
  • the detection device can be designed in such a way that the electrical coil on the one hand serves to detect the secondary field emanating from the foreign body (ie as a receiver coil) and is likewise used as the transmitter coil of the pulse induction device.
  • the possibly single electric coil would be driven via a so-called pulse generator for generating the pulsed primary field, wherein the primary field is built up and maintained during the pulse duration and during which the impulse duration (n) and the short duration of the steeply sloping Pulse edge (s) (during which the primary field collapses) subsequent pulse break (s) takes place receiving the foreign body generated (and slowly degrading during the pulse break (s)) secondary field.
  • the transmission and reception times of the various electrical coils would have to be matched to one another accordingly.
  • the second embodiment of the detection device according to the first embodiment described above (which is why the features described below with respect to the two receiver coils at this point apply to the first embodiment) comprises at least two receiver coils, wherein these are arranged at the same axial position of the belt conveyor, preferably parallel to each other and at different distances to the conveyor belt level, in particular above the conveyor belt.
  • at least one electrical coil can be designed, controlled and evaluated in such a way that this electrical coil works or can work both as a transmitter coil and as a receiver coil.
  • the pulse induction method known per se in conjunction with a so-called differential arrangement with preferably at least two electric coils operating as receiver coils (and identically constructed - ie having the same parameters), which are located at an axially identical conveyor belt position above the winninggutstroms are advantageously parallel to each other and arranged at a predetermined distance from each other - apply or further develop it accordingly.
  • the lower receiver coil (the receiver coil with the shorter distance to the conveyed stream) primarily receives the signals from the metallic interfering components of the belt conveyor assembly (metallic sidewalls, metallic conveyor, etc.) including the signals of any electrically conductive foreign object
  • the upper receiver coil (Receiver coil with the greater distance from the conveyor belt level) primarily detects the signals of the metallic interference components of the belt conveyor direction structure.
  • a further improvement in the detection situation can be achieved by measuring the speed of the conveyor belt and comparing the speed-dependent signature of the signal from foreign bodies with previously recorded and deposited foreign body reference signals using a cross-correlation method. This significantly reduces the influence of constant signals or those that show the "wrong" signature.
  • the invention comprises a method (which can be carried out with both embodiments of a detection device described above) for detecting an electrically conductive foreign body in a conveyed material flow of a belt conveyor having a detection device.
  • a time-varying, acting on the winninggutstrom primary magnetic field is generated at a predetermined axial position of the belt conveyor by means of pulse induction, depending on a comparison of the at the predetermined axial position of the belt conveyor for a certain (determined) conveyor belt position of the loaded conveyor belt detected (and generated by pulse induction measurement signal) is closed with the associated at this axial position of the belt conveyor for the same conveyor belt position comparison signal on the presence or absence of an electrically conductive foreign body to be detected.
  • the comparison signal based on the two different embodiments of the detection device, either as second the winninggutstrom at the predetermined axial position (at a different distance) scanning the measuring signal of a second receiver coil and / or as previously generated and stored in the evaluation reference signal (a in unloaded conveyor belt state at the predetermined axial position measured belt conveyor) may be formed.
  • Fig. 1 shows a belt conveyor 2 with a metallic components W having structure (eg existing to essential parts of metal guide side walls, plate belt, drive or pulleys, conveyor belt steel cables, shoring, drive motors or the like).
  • the belt conveyor 2 is shown in fragmentary form in the illustrated embodiment, wherein as a conveyor configured as an endless belt conveyor belt FB is present, which is driven or deflected at its ends via corresponding drive and pulleys, and is held on the bottom side on corresponding holding racks.
  • the belt conveyor device 2 has guide side walls made of metal over wide axial regions (conveyor belt sections).
  • the metallic structural components W represent significant interference factors for electromagnetic detection devices for detecting electrically conductive foreign bodies K within the conveyed material flow F.
  • a detection device 1 For detection of electrically conductive foreign bodies K within the conveyed stream F to be transported on the conveyor belt FB, a detection device 1 is provided which advantageously a pulse induction device for generating a force acting on the winninggutstrom F primary magnetic field Ml and an electric coil 4; 40 and an evaluation device 6 for detecting and evaluating a secondary field M2 constructed by the eddy currents l w generated in the electrically conductive foreign body K due to the targeted collapse of the primary field M1.
  • the evaluation device 6 executes the detection of the electrically conductive foreign body K in a program-supported manner.
  • This detection takes place in a possible embodiment of the invention as a function of a comparison of the metallic environment of the belt conveyor 2 (with respect to the disturbing influences on an electromagnetic field (here: the secondary field M2)) reflecting (or correlating herewith) reference signal S Ref one through the electric coil 4; 40 detected or received measurement signal S measurement i.
  • an electromagnetic field here: the secondary field M2
  • a single electrical coil 4 - both as a transmitter coil for generating the primary field Ml and as a receiver coil for detecting the due to the primary field Ml in the electrically conductive foreign body K generated secondary field M2 (or a correlated parameters ) is operable - in connection with a (eg) stored in the evaluation unit 6 reference signal S Ref (eg reference value signal sequence of the belt conveyor 2 for a complete circulation of the empty conveyor belt FB) a detection device 1 for electrically conductive foreign bodies K in winninggutstrom F are created.
  • a detection device 1 for electrically conductive foreign bodies K in winningstrom F are created.
  • the detection takes place in response to a signal comparison of the two working as receiver coils, preferably parallel above the conveyor belt FB arranged electrical coils 4, 40.
  • a signal comparison of the two working as receiver coils preferably parallel above the conveyor belt FB arranged electrical coils 4, 40.
  • at least two electric coils 4, 40 for the Detection of an electrically conductive foreign body K required.
  • this can be dispensed with in a simple embodiment, the comparison or the inclusion of a stored reference signal S Ref of the empty conveyor belt FB.
  • the detection device 1 essentially comprises two annularly formed electrical coils 4 and 40 and at least one electrically connected to at least one of the two electrical coils 4, 40 Pulse generator G, G 'and one (in the example shown) with the two coils 4, 40 electrically connected evaluation device 6.
  • the two electric coils 4 and 40 are formed as toroidal coils with substantially square or rectangular running longitudinal section and (with its annular surface) arranged parallel to the conveyed material flow F at different distances II, 12 and at the same axial position X of the belt conveyor 2.
  • the two coils 4, 40 are arranged at a distance d (10-1000 mm, in particular 150-550 mm) spaced from each other.
  • the coils 4, 40 with a corresponding positioning drive (not shown), so that the distance d and / or the respective distance II, 12 of the coil 4, 40 can be adjusted correspondingly to the belt conveyor 2 is.
  • the pulse induction device comprises in the illustrated embodiment, a pulse generator G for generating a pulse-shaped signal sequence i (eg rectangular signal sequence) and controlled by the pulse generator G acting as a transmitter coil electric coil 4.
  • a pulse generator G for generating a pulse-shaped signal sequence i (eg rectangular signal sequence) and controlled by the pulse generator G acting as a transmitter coil electric coil 4.
  • several pulse generators G, G 'for controlling different arranged at axially same position X, parallel spaced electrical coils 4, 40 may be present, wherein the individual generated primary magnetic fields then additively overlap to a resulting total primary magnetic field.
  • the or each electrical coil 4, 40 can be operated both as a transmitter coil and as a receiver coil.
  • the respective coil 4, 40 would work as transmitter coil during the pulse duration Ti and during the i.W. immediately after the pulse duration Ti (or its downstream falling edge) subsequent pulse interval Tp work as a receiver coil.
  • electrical coils 4, 40 may be present in addition to an exclusively operating as a transmitter coil.
  • a short current pulse i of a few microseconds (in particular 10-2000 ps) pulse duration (or a corresponding pulse signal sequence) is fed into the coil 4 via the pulse generator G.
  • the rising current generates in the electric coil 4 a corresponding primary magnetic field Ml. If the current is abruptly switched off (the expiration of the pulse duration Ti) at the end of the current pulse, this results in a very rapid collapse of the primary field M 1 (essentially during the period of the falling pulse edge).
  • the electrical coil 4 (transmitter / receiver coil) can be switched to receive or another electrical coil 40 can be activated as a receiver coil.
  • the eddy currents l w produced in the foreign body by the collapse of the primary field M1 become a further, the so-called secondary field generated M2, which is emitted from the foreign body K and from the respective receiver coil 4; 40 is detected.
  • the time-varying (degrading over time) secondary field M2 induced in the working as a receiver coil electric coil 4; 40 a (small) voltage, which is then amplified and evaluated.
  • a detection device 1 with at least one (then working as a transmitter / receiver coil) electrical coil 4 and an evaluation device 6 with deposited reference signal S Ref is detected by the single electrical coil 4 measurement signal S Me ssi of the secondary field M2 by Comparison with the stored reference signal S Ref evaluated.
  • the detection device 1 has at least two electrical coils 4, 40 operating at least as a receiver coil
  • the different received signals due to the different distance (II, 12) to the conveyed product flow F or to the foreign body K (measurement signals: S meas , S MeS s2) with each other and concluded on the basis of this comparison on the presence or absence of a foreign body K closed.
  • a difference signal from the two detected measurement signals S MeS si. S Me ss2 generated and this compared with a stored reference signal S ef .
  • the solid line field Ml solid lines and the foreign body K induced eddy currents l w generated during shutdown illustrate the transmit phase during the pulse duration Ti, including the very short duration of the primary field breakdown during the time of the edge fall.
  • the dashed line field lines of the generated (due to the eddy currents) secondary field M2 is essentially the temporally iW immediately adjacent to the pulse duration Ti reception phase illustrated within the pulse interval Tp.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Control Of Conveyors (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un dispositif de détection (1) pour un dispositif de transport à bande (2) pourvu d'une structure présentant des éléments constitutifs métalliques et un procédé de reconnaissance d'un corps étranger (K) électroconducteur dans un flux de produit transporté (F) d'un tel dispositif de transport à bande. Le dispositif de détection comporte avantageusement un dispositif d'induction d'impulsion destiné à générer un champ magnétique primaire (M1) agissant sur le flux de produit transporté (F), une bobine électrique (4) et un dispositif d'évaluation (6) servant à détecter et évaluer un champ magnétique secondaire (M2) produit par le corps étranger (K) électroconducteur en raison du champ magnétique primaire (M1). La reconnaissance du corps étranger (K) électroconducteur dans le flux de produit transporté a lieu en fonction d'une comparaison d'un signal de référence (SRef) reproduisant l'environnement métallique du dispositif de transport à bande (2) pour ce qui est des influences parasites sur le champ électromagnétique ou d'un signal de mesure d'une deuxième bobine réceptrice (40) détectant l'environnement métallique avec un signal de mesure (SMess) déterminé par la bobine électrique (4) du dispositif de détection.
EP10784971A 2009-12-17 2010-11-11 Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande Withdrawn EP2513676A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910058549 DE102009058549A1 (de) 2009-12-17 2009-12-17 Detektionseinrichtung für eine Bandfördereinrichtung und Verfahren zur Detektion von elektrischen leitfähigen Fremdkörpern im Fördergut einer Bandfördereinrichtung
PCT/EP2010/006886 WO2011082728A1 (fr) 2009-12-17 2010-11-11 Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande

Publications (1)

Publication Number Publication Date
EP2513676A1 true EP2513676A1 (fr) 2012-10-24

Family

ID=43589410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10784971A Withdrawn EP2513676A1 (fr) 2009-12-17 2010-11-11 Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande

Country Status (3)

Country Link
EP (1) EP2513676A1 (fr)
DE (1) DE102009058549A1 (fr)
WO (1) WO2011082728A1 (fr)

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ES2535246T3 (es) 2012-08-16 2015-05-07 Tomra Sorting As Método y aparato para analizar objetos metálicos considerando los cambios en las propiedades de las cintas
FR3001643B1 (fr) * 2013-02-07 2015-02-20 Grs Valtech Procede de tri en flux continu de matieres contaminees et dispositif correspondant
CA2970327C (fr) * 2014-12-09 2023-10-10 Cmte Development Limited Procede et systeme pour la detection d'objets conducteurs
DE102015209589A1 (de) 2015-05-26 2016-12-01 Wacker Chemie Ag Vorrichtung zur Förderung eines Produktstroms aus Polysiliciumbruch oder Polysiliciumgranulat
CN108722903B (zh) * 2018-04-23 2024-01-12 周志明 一种基于胶带输送机的金属检测分离装置及方法
NL2023193B1 (nl) * 2019-05-24 2020-12-02 Univ Delft Tech Inrichting en werkwijze voor het vanaf een vlak uitnemen van objecten
EP3976281A1 (fr) * 2019-05-24 2022-04-06 Technische Universiteit Delft Appareil et procédé de ramassage d'objets sur une surface
DE102021000157A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se lnduktive Annäherungssensoreinheit und Verfahren zur Störungsüberprüfung bei einer induktiven Annäherungssensoreinheit
DE102021000156A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se lnduktive Annäherungssensoreinheit und Verfahren zur Bestimmung einer Objekteigenschaft eines metallischen Erfassungskörpers
CN113546859A (zh) * 2021-07-30 2021-10-26 惠州光弘科技股份有限公司 车载电子产品生产用质量检测装置及其使用方法
CN114721057A (zh) * 2022-05-06 2022-07-08 山东协成机电科技有限公司 一种识别循环运行载具自有金属物体的探测方法及其装置

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Also Published As

Publication number Publication date
WO2011082728A1 (fr) 2011-07-14
DE102009058549A1 (de) 2011-06-22

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