DE102010017801A1 - Device for monitoring a conveyor system using an electrode component for detecting damage to a conveyor belt - Google Patents

Abstract

The invention relates to a device for continuous and non-destructive monitoring of a conveyor system (1) with at least the following components: an endlessly closed conveyor belt (2) with a support-side cover plate (3) and running-side cover plate (4) each made of a polymeric material with elastic properties and a mixed-in electrically conductive filler and with an embedded tension member; - Drums (5), support rollers (6) and support frames, the aforementioned components in connection with the conveyor belt (2) forming a material-conveying upper run (A) and a material-free lower run (B); and - a monitoring system (7) for detecting damage to the conveyor belt (2), which is provided with at least one scanning unit (8), which contactlessly the surface of the carrying-side cover plate (3) within a material-free area and / or the surface of the running-side cover plate (4) of the conveyor belt (2) running past, the scanning unit (8) corresponding to a measuring unit (9) and evaluation unit (10), namely by recording the actual values when compared with the target values. The device according to the invention is characterized in that, within the scope of a dielectric measuring system, the scanning unit (8) is an electrode component which consists of at least a first electrode and a second electrode and a gap between these two electrodes, which comprises a medium generates an electric field, with which changes in the structure of the support-side cover plate (3) and / or the running-side cover plate (4) of the conveyor belt (2) can be detected.

Description

• – einem endlos geschlossenen Fördergurt mit einer tragseitigen Deckplatte und laufseitigen Deckplatte aus jeweils einem polymeren Werkstoff mit elastischen Eigenschaften und einem eingemischten elektrisch leitfähigen Füllstoff sowie mit einem eingebetteten Zugträger;
• – Trommeln, Tragrollen und Traggerüste, wobei die vorgenannten Bauteile in Verbindung mit dem Fördergurt ein materialförderndes Obertrum und ein materialfreies Untertrum bilden; sowie
• – einem Überwachungssystem zur Erfassung von Schäden des Fördergurtes, das mit wenigstens einer Abtasteinheit versehen ist, die berührungslos die Oberfläche der tragseitigen Deckplatte innerhalb eines materialfreien Bereiches und/oder die Oberfläche der laufseitigen Deckplatte des vorbeilaufenden Fördergurtes erfasst, wobei die Abtasteinheit mit einer Messeinheit und einer Auswerteeinheit korrespondiert, und zwar unter Erfassung der Ist-Werte bei Abgleich mit den Soll-Werten.

The invention relates to a device for continuous and non-destructive monitoring of a conveyor system with at least the following components:

• - An endlessly closed conveyor belt with a support-side cover plate and running side cover plate each having a polymeric material having elastic properties and a mixed electrically conductive filler and with an embedded tensile member;
• - Drums, carrying rollers and shoring, wherein the aforementioned components in conjunction with the conveyor belt form a material-promoting upper strand and a material-free lower strand; such as
• - A monitoring system for detecting damage to the conveyor belt, which is provided with at least one scanning unit, the non-contact surface of the support-side cover plate within a material-free area and / or the surface of the running side cover plate of the passing conveyor belt detected, wherein the scanning unit with a measuring unit and a The evaluation unit corresponds with the acquisition of the actual values when compared with the setpoint values.

As regards the construction of a conveyor belt, reference is made in particular to the following patent documents: DE 25 20 943 A1 DE 38 01 120 A1 DE 25 32 190 A1 DE 43 33 839 A1 DE 44 36 042 A1 EP 0 753 471 A1 EP 0 336 385 A1 WO 2008/034483 A1

The load-side cover plate and the run-side cover plate usually each consist of a rubber mixture comprising a rubber component or a rubber component blend, a crosslinking agent or a crosslinking system comprising a crosslinking agent and an accelerator, and usually further Mischingingredienzien, in particular a filler and / or a processing aid and / or a Anti-aging agents and / or a plasticizer and / or other additives (eg fibers, color pigments). The relevant rubber base is in particular:
Natural rubber (NR)
Butadiene rubber (BR)
Chloroprene rubber (CR)
Styrene butadiene rubber (SBR)
Nitrile rubber (NBR)
Butyl rubber (IIR)
Ethylene-propylene rubber (EPM)
Ethylene-propylene-diene rubber (EPDM)
SBR / BR blend
NR / BR blend

Of particular importance to date is CR, which is characterized by high resistance to fire, weathering and aging, in particular for conveyor belts used in underground mining. NR has also become more important in surface mining.

Due to the vulcanization of a rubber mixture of the type mentioned above, the conveyor belt undergoes the necessary elastic properties.

As embedded tension members, steel or aramid ropes running in the longitudinal direction of the conveyor belt are used, ropes made of steel being of particular importance. In particular, in connection with steel cable conveyor belts, an embedded transverse reinforcement made of synthetic cords, for example of polyamide (PA), is additionally used for slot protection ( WO 2008/034483 A1 ). The tension member may also be a textile fabric, in particular a single- or multi-ply fabric, for example a polyester-polyamide fabric.

In most cases, the leadership of a conveyor belt takes place in a conveyor system in an open form, in the context of a domed carrying roller chair.

In the last 20 years, however, the closed conveyor system has been further developed using a tubular conveyor belt. The plant components are in the closed conveyor system next to the Drums (drive drum, reversing drum), carrying rollers and shoring usually still correction rollers and a hold-down roller when closing the conveyor belt. In this regard, reference is made in particular to the following patent literature: DE 36 06 129 A1 DE 10 2009 003 552 A1 DE 36 12 765 A1 EP 0 336 385 A1 DE 43 33 839 B4

Further components of a conveyor system may be a feed chute within the upper run, deflection rollers in the region of the lower run and conveyor belt profiles made of a polymeric material, for example edge profiles.

Conveyor belts are heavily stressed when impacting the conveying material, for example ores. This often causes damage to the support-side cover plate of the conveyor belt, in the form of cuts, material chipping or other damage. These are critical for the life of the conveyor belt and must therefore be recognized as early as possible. Wear due to abrasion can also occur in the run-side cover plate with contact with the drums and idlers and optionally to other roller components mentioned above. Moreover, in the case of a steel cable conveyor belt, the load-bearing and / or run-side cover plate can be slit open under extreme loads by the steel cables, the already presented synthetic cord transverse reinforcement providing a slot protection, albeit not always sufficient. Ultimately, the tension member can be damaged in a continuous operation, which can have a negative impact on the tensile force of a conveyor belt.

• – Die Druckschriften DE 44 44 264 C1 , DE 197 15 703 A1 und WO 02/40 384 A1 beschreiben einen Ansatz, bei der die Fördergurte mit Leiterschleifen in regelmäßigen Abständen versehen werden, deren Beschädigungen durch elektroinduktive Messverfahren detektiert werden können. Anstelle der Leiterschleifen oder in Kombination mit diesen können auch Transponder zum Einsatz gelangen. Nachteilig bei diesem Überwachungskonzept ist die Empfindlichkeit der Systeme auf die Einsatzbedingungen und die notwendige Modifikation der Gurtaufbauten mit den Leiterschleifen und/oder Transpondern. Insbesondere die Transponder sind äußerst störanfällig.
• – Die Druckschriften DE 195 39 980 A1 und EP 0 787 669 B1 beschreiben eine Überwachungseinrichtung unter Verwendung von quer zur Förderrichtung in den Fördergurt eingebauten Überwachungselementen und Identifikationselementen, die bei Vorbeiführen an ortsfesten Leseeinrichtungen sowohl den Zustand als auch die Position meldet. Dieses Überwachungskonzept ist jedoch in seiner Umsetzung sehr aufwendig.
• – Die Offenlegungsschrift DE 198 40 081 A1 stellt ein System zur Überwachung einer einem Verschleiß unterworfenen Schicht vor. So wird beispielsweise eine ferromagnetische Schicht in die tragseitige und/oder laufseitige Deckplatte eingebettet, die das Signal eines darunter liegenden Transponders abschirmt, es sei denn, dass diese Schicht beschädigt ist. Auch dieses Überwachungskonzept ist sehr aufwendig und nur auf speziell ausgerüstete Fördergurte anwendbar.
• – Die Kontrolle des Zustandes der Stahlseile in Fördergurten erfolgt durch ein außen vorbeigeführtes induktives Feld ( DE 199 21 224 A1 ) oder durch ein magnetisches Feld ( DE 10 2006 036 668 A1 ). Nachteilig ist, dass hiermit nur Beschädigungen der Stahlseilstrukturen erfassbar sind.
• – Bei der Überwachung der Beschädigungen der tragseitigen und/oder laufseitigen Deckplatte kommen opto-elektronische Systeme, insbesondere in Form einer Zeilen- oder Flächenkamera, zum Einsatz, wobei diesbezüglich insbesondere auf folgende Patentliteratur verwiesen wird:

DE 24 13 543 A1 DE 101 29 091 A1 DE 42 40 094 A1 DE 101 40 920 A1 DE 100 29 545 A1 EP 1 187 781 B1 DE 100 48 552 A1 WO 2005/023688 A1 DE 101 00 813 A1 WO 2008/031648 A1 Die hier dokumentierten umfangreichen Entwicklungsarbeiten unterstreichen die zunehmende Bedeutung dieser Überwachungseinrichtung. Neben dem großen technischen Aufwand ist dieses Überwachungskonzept jedoch von einer Gurtoberfläche ohne wesentliche Verschmutzung abhängig. Aus diesem Grunde wird das opto-elektronische System zusätzlich mit einer Freiblasvorrichtung versehen, was jedoch die Grenzen der Wirtschaftlichkeit aufzeigt.

• – Ferner ist eine Einrichtung zur zerstörungsfreien Inspektion eines Fördergurtes mittels energiereicher Strahlen, insbesondere Röntgenstrahlen, bekannt, wobei diesbezüglich insbesondere auf folgende Patentliteratur verwiesen wird:

DE 35 17 314 A1 JP 04158208 A (Patent Abstracts of Japan) WO 2006/066519 A1 JP 2000292371 A (Patent Abstracts of Japan) Nachteilig ist, dass bei derartigen Strahlen aus Sicherheitsgründen das Überwachungssystem in ein Gehäuse integriert werden muss, was ebenfalls die Grenzen der Wirtschaftlichkeit aufzeigt.
Ferner wird bei diesem Überwachungseinrichtung vorrangig das Innenleben eines Fördergurtes, insbesondere die eingebetteten Stahlseile, erfasst.In addition to the regular visual inspection, there are various systems for monitoring the state of the conveyor belt during operation of a conveyor system. An outline of the related art is given below:

• - The pamphlets DE 44 44 264 C1 . DE 197 15 703 A1 and WO 02/40 384 A1 describe an approach in which the conveyor belts are provided with conductor loops at regular intervals, the damage of which can be detected by electro-inductive measuring methods. Instead of the conductor loops or in combination with these, transponders can also be used. A disadvantage of this monitoring concept is the sensitivity of the systems to the conditions of use and the necessary modification of the belt structures with the conductor loops and / or transponders. In particular, the transponders are extremely susceptible to interference.
• - The pamphlets DE 195 39 980 A1 and EP 0 787 669 B1 describe a monitoring device using transversely to the conveying direction in the conveyor belt built-in monitoring elements and identification elements, which reports both the state and the position when passing on stationary reading devices. However, this monitoring concept is very complicated in its implementation.
• - The publication DE 198 40 081 A1 presents a system for monitoring a layer subject to wear. Thus, for example, a ferromagnetic layer is embedded in the support-side and / or run-side cover plate, which shields the signal of an underlying transponder, unless this layer is damaged. This monitoring concept is very complex and only applicable to specially equipped conveyor belts.
• - The condition of the steel cables in conveyor belts is controlled by an inductive field ( DE 199 21 224 A1 ) or by a magnetic field ( DE 10 2006 036 668 A1 ). The disadvantage is that hereby only damage to the steel cable structures can be detected.
• - When monitoring the damage of the support side and / or running side cover plate opto-electronic systems, in particular in the form of a line or area camera, are used, in which reference is made in particular to the following patent literature:

DE 24 13 543 A1 DE 101 29 091 A1 DE 42 40 094 A1 DE 101 40 920 A1 DE 100 29 545 A1 EP 1 187 781 B1 DE 100 48 552 A1 WO 2005/023688 A1 DE 101 00 813 A1 WO 2008/031648 A1 The extensive development work documented here underlines the increasing importance of this monitoring device. In addition to the great technical effort, this monitoring concept However, depending on a belt surface without significant contamination. For this reason, the opto-electronic system is additionally provided with a blow-off device, which, however, shows the limits of cost-effectiveness.

• Furthermore, a device for non-destructive inspection of a conveyor belt by means of high-energy radiation, in particular X-rays, is known, reference being made in this regard in particular to the following patent literature:

DE 35 17 314 A1 JP 04158208 A (Patent Abstracts of Japan) WO 2006/066519 A1 JP 2000292371 A (Patent Abstracts of Japan) The disadvantage is that with such beams for safety reasons, the monitoring system must be integrated into a housing, which also shows the limits of cost-effectiveness.
Furthermore, the inner life of a conveyor belt, in particular the embedded steel cables, is primarily detected in this monitoring device.

In the background of the above-mentioned overall problem, the object is to provide a generic device for monitoring a conveyor system, in which the damage of the supporting side and / or running side cover plate, in particular the support side cover plate, can be detected early and also wear-free, low maintenance and at economical as possible.

This object is achieved in that, in the context of a dielectric measuring system, the scanning unit is an electrode component consisting of at least one first electrode and second electrode and a gap between these two electrodes comprising a medium, thereby generating an electric field, which changes in the construction of the support-side cover plate and / or running side cover plate of the conveyor belt can be detected.

The polymeric materials typically used in conveyor belts for the support-side and / or running-side cover plate are generally elastomer formulations on the above-mentioned rubber base with a significant proportion of carbon black as filler in the formulation. These are polymeric materials with good conductive fillers in an insulating polymer matrix. This polymer matrix usually has a significant polarizability, as described by the dielectric constant. The dielectric constant describes how much under the influence of an electric field charges can shift within the material, for example by training and / or alignment of existing dipoles. Bringing such a material in an electric field, it causes a change in the capacitance measurable at the electrodes. The change is material-specific and depends on the amount of polarizable polymer material in the field.

This effect is now exploited in the device according to the invention by passing the conveyor belt on an electric field, which is monitored continuously with respect to its capacity. If, for example, there are breakouts or damage to the support-side cover plate, the amount of polymer material in the electric field is changed and this can be observed in a changed capacitance in the electrical measurement.

Also, this measuring principle reacts to changes in the polymeric material, for example in relation to the mechanical aging, but which are not expected in the conveyor belt to this extent. Here, the amount of polymeric material in the electric field is crucial for the measurement signal.

The publication WO 2007/109896 A1 also describes a dielectric measurement approach for monitoring drive belts in use, but in contrast to the device according to the invention, changes in the polymer material are pursued.

The publication WO 2009/003853 A2 describes the use of dielectric measurement of polymer materials to track aging and fatigue processes.

With regard to the arrangement of the electrode component close to the passing conveyor belt, three variants are presented below:

- Variant I

The electrode component is arranged such that the electric field covers the entire conveyor belt width. This is preferably the case when the conveyor belt is not too wide, for example up to 1000 mm.

- Variant II

The electrode component is arranged such that the electric field substantially only covers the central region of the conveyor belt, which is particularly affected by impact damage with regard to the support-side cover plate. For example, if the conveyor belt is 2000 mm wide, the center area is detected with a dimension of about 1000 mm.

- Variant III

Large overland conveyor belts, for which monitoring is of particular importance, are generally up to 2800 mm wide. From these points of view, it is advantageous if the conveyor belt is divided into longitudinal strips. For example, if the conveyor belt has a width of 2000 mm, it is divided into 20 longitudinal strips, each with a width of 100 mm. After each revolution, the electrode component is displaced by 100 mm as a scanning unit. A 2000 mm wide conveyor belt would then be completely recorded in 20 rounds. In this way, you can work with smaller electrode components, for example, with the dimensions of 100 × 100 mm.

• – Das detektierbare Element ist ein Metallstreifen.
• – Das detektierbare Element umfasst eine Polymermatrix, vorzugsweise auf der Basis des Deckplattenwerkstoffes, wobei in diese Polymermatrix möglichst gleichmäßig verteilt kleinstückige Metallteilchen, beispielsweise in Pulverform, eingearbeitet sind.

Furthermore, it is advantageous if, in order to localize the damage at regular intervals, for example at a distance of 20 m, detectable elements are integrated in the conveyor belt, to form a respective section mark. Each section is assigned a unique address, for example, in a number or letter sequence. The detectable element is completely embedded in the conveyor belt or attached to the belt surface. The preferred variant is the complete embedding, specifically to protect the detectable element. This detectable element consists in particular of a dielectrically active material. Examples are given in particular:

• - The detectable element is a metal strip.
• - The detectable element comprises a polymer matrix, preferably on the basis of the cover plate material, wherein in this polymer matrix evenly distributed small-sized metal particles, for example in powder form, are incorporated.

Further design variants of the monitoring device as well as design forms of the Elekrodenbauteils as a scanning unit are presented in more detail in the description of the figures.

The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it:

1 a conveyor system with an electrode component as a scanning unit, which corresponds to a measuring unit and evaluation unit;

2 an annular shaped electrode component;

3 an electrode component in a combing construction.

1 shows a conveyor system 1 with a conveyor belt 2 comprising a support-side cover plate 3 and a running cover plate 4 each of a polymeric material having elastic properties, for example, a vulcanized rubber compound based on CR, and an embedded Zuträger, for example in the form of steel cables. In the vulcanized rubber mixture, an electrically conductive filler in the form of carbon black is added.

In the running direction (maintenance direction) is the conveyor belt 2 around a drum 5 guided, wherein within the upper strand A, the material promotion takes place. The drum 5 , which has no contact with the conveying material, is usually the drive drum. The reversing drum, where the conveyor belt 2 is transferred from the upper strand A in the lower strand B, and that with simultaneous ejection of the conveying material is not shown here. With regard to details of this reference is made to the aforementioned state of conveyor technology. The running side cover plate 4 supports itself within the upper run A and the upper run B on idlers 6 from.

The conveyor system 1 is with a surveillance system 7 equipped, comprising a scanning unit 8th , Measuring unit 9 and an evaluation unit 10 , The scanning unit 8th touches contactlessly the surface of the support-side cover plate 3 within the lower run B, where no material promotion takes place. Because the drum 5 is also free of material, the scanning can be arranged within this drum area. The distance of the scanning unit 8th to the passing conveyor belt 2 is ≤ 10 mm, in particular 2 to 5 mm. This preferred small distance is in a principle of arrangement of the scanning unit 8th within the lower run B or within the range of the drum 5 realizable.

As part of the examination of the running side cover plate, the scanning unit can be arranged both in the upper run and in the lower run. However, the arrangement of the scanning unit within the lower strand is also preferred here.

In the direction of the conveyor belt 2 can before the scanning unit 8th , For example, at the position X, nor a brush or a scraper be arranged, which cleans the belt surface.

In most cases, a single scanning unit is sufficient 8th , In large-scale conveyor systems, several scanning units can be arranged at certain intervals.

The conveyor system 1 can also be equipped with an additional component in the form of an audible and / or visual warning, which then reacts when a critical condition regarding the damage of the support-side cover plate 3 and / or running side cover plate 4 is reached. An automatic shutdown of the conveyor system upon reaching such a critical state is possible. In this context, reference is made in particular to the prior art mentioned at the outset for the monitoring of a conveyor system by means of opto-electronic systems.

In the context of the device according to the invention is now the scanning unit 8th an electrode component. The electrode component is designed in terms of area so that a significant capacity of the polymer mixture in question can be measured. For example, the standard electrode can be inserted DIN 53483 ,

In conjunction with the 2 and 3 Now two preferred electrode components are presented in more detail.

2 shows an electrode component 11 in an annular design. The first electrode 12 forms the core and is of the sleeve-shaped second electrode 13 surround. Between these two electrodes is an annular air gap 14 , Between the two electrodes now an alternating electric field is applied. With a corresponding measuring electronics behind it, for example by means of a dielectric network channel, the capacitance signal and thus the dielectric constant can be evaluated.

The measurement is preferably carried out at a fixed frequency. Medium frequencies of 10 to 200 kHz have proven to be ideal.

The penetration depth of the electric field in the sample can be controlled by the distance between the two electrodes to each other. With a distance of several millimeters, the penetration depth is large enough so that the field also interacts with the cover layer of the conveyor belt to be measured.

The typically conveyed bulk materials are so low in their dielectricity that residues still adhering to the surface are negligible. However, it is beneficial if in conjunction with the 1 featured additional cleaning measure the belt surface is made by a running bust or a scraper.

3 shows an electrode component 15 in a combing construction. The crest tips 18 the first electrode 16 and the crest tips 19 the second electrode 17 form here under formation of an air gap 20 an interdigitated electrode system. With such an electrode construction, the capacitance signal can be increased. Otherwise, it is here in accordance with in the embodiment according to 2 Said directed.

LIST OF REFERENCE NUMBERS

1

conveyor system

2

conveyor belt

3

load-bearing cover plate

4

running side cover plate

5

drum

6

idlers

7

monitoring system

8th

scanning

9

measuring unit

10

evaluation

11

Electrode component in annular design

12

first electrode

13

second electrode

14

Gap in the form of an air gap

15

Electrode component in comb-shaped design

16

first electrode

17

second electrode

18

Comb tip of the first electrode

19

Comb tip of the second electrode

20

Gap in the form of an air gap

A

obertrum

B

strand

X

Position of a brush or a scraper

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2520943 A1 [0002]
• DE 3801120 A1 [0002]
• DE 2532190 A1 [0002]
• DE 4333839 A1 [0002]
• DE 4436042 A1 [0002]
• EP 0753471 A1 [0002]
• EP 0336385 A1 [0002, 0008]
• WO 2008/034483 A1 [0002, 0006]
• DE 3606129 A1 [0008]
• DE 102009003552 A1 [0008]
• DE 3612765 A1 [0008]
• DE 4333839 B4 [0008]
• DE 4444264 C1 [0011]
• DE 19715703 A1 [0011]
• WO 02/40384 A1 [0011]
• DE 19539980A1 [0011]
• EP 0787669 B1 [0011]
• DE 19840081 A1 [0011]
• DE 19921224 A1 [0011]
• DE 102006036668 A1 [0011]
• DE 2413543 A1 [0011]
• DE 10129091 A1 [0011]
• DE 4240094 A1 [0011]
• DE 10140920 A1 [0011]
• DE 10029545 A1 [0011]
• EP 1187781 B1 [0011]
• DE 10048552 A1 [0011]
• WO 2005/023688 A1 [0011]
• DE 10100813 A1 [0011]
• WO 2008/031648 A1 [0011]
• DE 3517314 A1 [0011]
• JP 04158208 A [0011]
• WO 2006/066519 A1 [0011]
• JP 2000292371 A [0011]
• WO 2007/109896 A1 [0017]
• WO 2009/003853 A2 [0018]

Cited non-patent literature

• DIN 53483 [0036]

Claims (16)

Device for continuous and non-destructive monitoring of a conveyor system ( 1 ) comprising at least the following components: - an endlessly closed conveyor belt ( 2 ) with a support-side cover plate ( 3 ) and running side cover plate ( 4 ) each of a polymeric material having elastic properties and a mixed electrically conductive filler and with an embedded tensile member; - Drums ( 5 ), Carrying rollers ( 6 ) and shoring, wherein the aforementioned components in conjunction with the conveyor belt ( 2 ) form a material-promoting upper strand (A) and a material-free lower strand (B); and - a surveillance system ( 7 ) for detecting damage to the conveyor belt ( 2 ), which is connected to at least one scanning unit ( 8th ), the non-contact the surface of the support-side cover plate ( 3 ) within a material-free area and / or the surface of the running-side cover plate ( 4 ) of the passing conveyor belt ( 2 ), wherein the scanning unit ( 8th ) with a measuring unit ( 9 ) and an evaluation unit ( 10 ) corresponds, under detection of the actual values in comparison with the desired values; characterized in that in the context of a dielectric measuring system, the scanning unit ( 8th ) an electrode component ( 11 . 15 ), which consists of at least one first electrode ( 12 . 16 ) and second electrode ( 13 . 17 ) and from a gap existing between these two electrodes ( 14 . 20 ), which comprises a medium, and thereby generates an electric field, whereby changes in the structure of the support-side cover plate ( 3 ) and / or running side cover plate ( 4 ) of the conveyor belt ( 2 ) are detectable. Device according to claim 1, characterized in that the electrode component ( 11 ) is annular. Device according to claim 1, characterized in that the electrode component ( 15 ) is formed in a meshing construction by the first electrode ( 16 ) and the second electrode ( 17 ) with their respective comb tips ( 18 . 19 ) mesh. Device according to one of claims 1 to 3, characterized in that the gap ( 14 . 20 ) between the first electrode ( 12 . 16 ) and the second electrode ( 13 . 17 ) is an air gap. Device according to one of claims 1 to 4, characterized in that the electrode component ( 11 . 15 ) when detecting the damage of the support-side cover plate ( 3 ) of the conveyor belt ( 2 ) in the area of that drum ( 5 ), where no conveying material is dropped, or within the lower run (B) of the conveyor ( 1 ) is arranged. Device according to one of claims 1 to 5, characterized in that the electrode component ( 11 . 15 ) is arranged such that the electric field covers the entire Fördergurtbreite. Device according to one of claims 1 to 5, characterized in that the electrode component ( 11 . 15 ) is arranged such that the electric field the center region of the conveyor belt ( 2 ) detected. Device according to one of claims 1 to 5, characterized in that a displaceable electrode component ( 11 . 15 ) a longitudinal strip system of the conveyor belt ( 2 ) detected. Device according to one of claims 1 to 8, characterized in that the electrode component ( 11 . 15 ) at a distance ≤ 10 mm to the passing conveyor belt ( 2 ) is arranged. Device according to claim 9, characterized in that the electrode component ( 11 . 15 ) at a distance of 2 to 5 mm to the passing conveyor belt ( 2 ) is arranged. Device according to one of claims 1 to 10, characterized in that the electrode component ( 11 . 15 ) works at a fixed frequency. Device according to claim 11, characterized in that the electrode component ( 11 . 15 ) operates at a frequency of 10 to 200 kHz. Device according to one of claims 1 to 12, characterized in that in order to localize the damage at regular intervals detectable elements in the conveyor belt ( 2 ) are integrated, forming a respective section mark. Device according to claim 13, characterized in that the detectable element completely in the conveyor belt ( 2 ) or attached to the belt surface. Device according to claim 14, characterized in that the detectable element consists of a dielectrically active material. Device according to one of claims 1 to 15, characterized in that in the running direction of the conveyor belt ( 2 ) in front of the scanning unit ( 8th ) a brush or a scraper is arranged.

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