DE3441742A1 - Conductor loops for monitoring conveyor cables which are prone to fraying - Google Patents
Conductor loops for monitoring conveyor cables which are prone to frayingInfo
- Publication number
- DE3441742A1 DE3441742A1 DE19843441742 DE3441742A DE3441742A1 DE 3441742 A1 DE3441742 A1 DE 3441742A1 DE 19843441742 DE19843441742 DE 19843441742 DE 3441742 A DE3441742 A DE 3441742A DE 3441742 A1 DE3441742 A1 DE 3441742A1
- Authority
- DE
- Germany
- Prior art keywords
- conductor loops
- twisted
- prone
- fraying
- monitoring
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
Landscapes
- Ropes Or Cables (AREA)
Abstract
Description
Die Erfindung betrifft Leiterschleifen aus MetalldrahtseilenThe invention relates to conductor loops made from metal wire ropes
mit verdrillten Litzenenden für die Überwachung von aufschlitzgefährdeten Fördergurten, wobei die Drillverbindungen anschliessend mit einem leitenden Überzug versehen werden.with twisted wire ends for monitoring those at risk of being slashed Conveyor belts, the twisted connections then with a conductive coating be provided.
Die gattungsbildende DE-OS 22 46 139 schlägt vor, die Drillverbindungen so auszubilden, daß in gegenseitigen Abständen aus dem Seil herausragende, miteinander verdrillte Litzenenden zu einer Endloslitze verbunden sind. Zur Verbesserung der stoffschlüssigen Haftung in dem Gurtkörper wird die Leiterschleife nach Herstellung der Drillverbindungen mit einem Messingüberzug versehen.The generic DE-OS 22 46 139 suggests the twisted connections to be trained so that protruding from the rope at mutual distances, with each other twisted strand ends are connected to form an endless strand. To improve the material adhesion in the belt body becomes the conductor loop after manufacture the twisted connections are provided with a brass coating.
Verbindungen durch verdrillte Litzenenden haben sich jedoch nicht bewährt, da, wie Untersuchungen unter dem Elektronenmikroskop zeigten, beim Vulkanisieren oder während des Setriebes durch den die Drillverbindung umschließenden Gummi die Kontaktstelle der entsprechenden Litze unterwandert wird, was zum Ausfall der Leiterschleife führt. Dadurch wurden Phänomene erklärlich, daß eine als defekt erkannte Leiterschleife - vergleichbar einem Wackelkontakt - nach dem Herauspräparieren aus dem Gummigurt plötzlich wieder leitfähig war. Durch die starke Walkarbeit beim Herauslösen haben sich die isolierend zwischen den verdrillten Litzen befindlichen Partikel verlagert und den metallischen Kontakt wieder hergestellt.However, connections through twisted wire ends do not have to be Tried and tested because, as investigations under the electron microscope have shown, during vulcanization or during operation through the rubber surrounding the twisted joint Contact point of the corresponding strand is infiltrated, which leads to failure of the conductor loop leads. This made it possible to explain phenomena that a conductor loop recognized as defective - comparable to a loose contact - after dissection from the rubber belt suddenly became conductive again. Due to the heavy flexing work when removing the insulating particles between the twisted strands are displaced and the metallic contact is restored.
Der in der DE-OS 22 46 139 zur Verbesserung der Haftung vorgeschlagene Messingüberzug bietet ebenfalss keinen Schutz, da der Überzug zu dünn ist.The proposed in DE-OS 22 46 139 to improve adhesion The brass coating also offers no protection because the coating is too thin.
Obwohl diese Ausgestaltung der Leiterschleifen zu guten Anfangsergebnissen führt, hat sie sich in der Praxis als störanfällig gezeigt, da nach kurzer Zeit durch den Walkprozeß im Fördergurt der Überzug abgerieben und das Metall freigelegt wird. Das führt alsbald zu einer chemischen Reaktion des Metalls mit Beistoffen der Gummimischung des Fördergurtes, vorwiegend Schwefel, und einer alsbaldigen Selbstzerstörung der Leiterschleife wegen fehlender Leitfähigkeit.Although this design of the conductor loops leads to good initial results leads, it has shown itself to be prone to failure in practice, since after a short time the coating rubbed off by the flexing process in the conveyor belt and the metal exposed will. This soon leads to a chemical reaction between the metal and the additives in the rubber compound of the conveyor belt, predominantly sulfur, and an imminent self-destruction of the Conductor loop due to lack of conductivity.
Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu vermeiden und eine Leiterschleife zu schaffen, die eine dauerhafte elektrische Verbindung garantiert und damit genügend leitfähig ist, um ein Signal ausreichender Stärke zu erzeugen.The invention is based on the object of avoiding these disadvantages and to create a conductor loop that provides a permanent electrical connection guaranteed and therefore sufficiently conductive to generate a signal of sufficient strength to create.
Diese Aufgabe wird gemäß der Erfindung durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1 solved.
Die Enden der Litzen eines verzinkten Stahlseils werden in an sich bekannter Weise durch Verdrillen miteinander verbunden und die Drillverbindungen vollständig in niedrigschmelzende Metalllegierungen oder leitend gemachte Kunststoffe eingebettet, um so dauerhafte und gegen äußere chemische Einflüsse resistente Verbindungen zu schaffen, die darüber hinaus nicht durch Gummi unterwandert werden können.The ends of the strands of a galvanized steel cable are in itself known way connected to each other by twisting and the twisted connections completely in low-melting metal alloys or plastics made conductive embedded, all the more durable and resistant to external chemical influences to create which, moreover, cannot be infiltrated by rubber.
Aus Gründen der Nachgiebigkeit werden die Leiterschleifen in flexibler Ausführung hergestellt. In der Praxis haben sich daher verzinkte Stahlseile geringen Durchmessers bewährt. Sie zeichnen sich durch hohe Festigkeit und chemische Resistenz aus.For reasons of flexibility, the conductor loops are more flexible Execution made. In practice, therefore, galvanized steel cables have proven to be very low Proven diameter. They are characterized by high strength and chemical resistance the end.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigt die Figur 1 die Anordnung der Drillverbindungen in einem verzinkten Stahlseil.An embodiment of the invention is shown in the drawing and is described in more detail below. It shows the figure 1 the arrangement of Twist connections in a galvanized steel cable.
Die Figur 1 zeigt einen Teilabschnitt der Leiterschleife, die aus einem verzinkten Stahlseil 5 besteht, das in einer bevorzugten Ausführungsform aus sieben Litzen gebildet wird. Die Drillverbindungen 1, 2 und 3 sind durch eine Ummantelung 4 geschützt, die z.B. aus Zinn besteht. Selbstverständlich werden auch die restlichen Litzen auf die gleiche Art verbunden und geschützt, so daß sich eine Endlos-Litze ergibt.Figure 1 shows a section of the conductor loop, which from a galvanized steel cable 5, which in a preferred embodiment consists of seven strands is formed. The twisted connections 1, 2 and 3 are sheathed 4, which is made of tin, for example. Of course, the rest of them will too Strands connected and protected in the same way, so that there is an endless strand results.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843441742 DE3441742C2 (en) | 1984-11-15 | 1984-11-15 | Conductor loops for monitoring conveyor belts at risk of slitting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843441742 DE3441742C2 (en) | 1984-11-15 | 1984-11-15 | Conductor loops for monitoring conveyor belts at risk of slitting |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3441742A1 true DE3441742A1 (en) | 1986-05-15 |
DE3441742C2 DE3441742C2 (en) | 1996-01-11 |
Family
ID=6250363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19843441742 Expired - Fee Related DE3441742C2 (en) | 1984-11-15 | 1984-11-15 | Conductor loops for monitoring conveyor belts at risk of slitting |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3441742C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4013764A1 (en) * | 1990-04-28 | 1990-12-13 | Raetz Walter | Shading ring - for electronic check of slits in conveyor belts |
DE3927746A1 (en) * | 1989-08-23 | 1991-02-28 | Raetz Walter | Built-in short circuit ring for monitoring conveyor belts - connects strand ends of metal wire cable at distance from each other and respectively any two ends are soft soldered parallel together |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19722673B4 (en) * | 1997-05-30 | 2004-08-05 | Contitech Transportbandsysteme Gmbh | Conductive loop for embedding in a belt, belt, conveyor belt |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7023445U (en) * | 1971-02-25 | Phoenix Gummiwerke Ag | Electrical conductor loop for conveyor belts | |
DE7113513U (en) * | 1971-07-22 | Phoenix Gummiwerke Ag | Spiral wire insert for steel cord conveyor belts | |
DE2246139A1 (en) * | 1972-09-20 | 1974-03-28 | Continental Gummi Werke Ag | ELECTRICAL CONDUCTOR FOR SLIT PROTECTION MONITORING ON CONVEYOR BELTS |
-
1984
- 1984-11-15 DE DE19843441742 patent/DE3441742C2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7023445U (en) * | 1971-02-25 | Phoenix Gummiwerke Ag | Electrical conductor loop for conveyor belts | |
DE7113513U (en) * | 1971-07-22 | Phoenix Gummiwerke Ag | Spiral wire insert for steel cord conveyor belts | |
DE2246139A1 (en) * | 1972-09-20 | 1974-03-28 | Continental Gummi Werke Ag | ELECTRICAL CONDUCTOR FOR SLIT PROTECTION MONITORING ON CONVEYOR BELTS |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3927746A1 (en) * | 1989-08-23 | 1991-02-28 | Raetz Walter | Built-in short circuit ring for monitoring conveyor belts - connects strand ends of metal wire cable at distance from each other and respectively any two ends are soft soldered parallel together |
DE3927746C2 (en) * | 1989-08-23 | 1999-02-11 | Raetz Walter | Installation short-circuit ring for slit monitoring on conveyor belts |
DE4013764A1 (en) * | 1990-04-28 | 1990-12-13 | Raetz Walter | Shading ring - for electronic check of slits in conveyor belts |
DE4013764C2 (en) * | 1990-04-28 | 1999-04-01 | Raetz Walter | Installation short-circuit rings for electronic slit monitoring on conveyor belts |
Also Published As
Publication number | Publication date |
---|---|
DE3441742C2 (en) | 1996-01-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: STAHLGRUBER OTTO GRUBER GMBH & CO., 85586 POING, D |
|
8339 | Ceased/non-payment of the annual fee |