DD249094A1

DD249094A1 - DEVICE FOR COLLECTING LEVELS IN STORES

Info

Publication number: DD249094A1
Application number: DD29014986A
Authority: DD
Inventors: Wolfgang Dymalla; Birgit Biermann; Gerhard Mosch; Axel Stock; Andreas Neumann; Harry Walther; Wilfried Hainemann
Original assignee: Sobottka Gustav Braunkohle
Priority date: 1986-05-12
Filing date: 1986-05-12
Publication date: 1987-08-26
Also published as: DD249094B3

Abstract

Die Erfindung betrifft eine Vorrichtung zum Erfassen von Fuellstaenden elektrisch leitfaehiger Schuettgueter oder Fluessigkeiten in Behaeltern. Erfindungsgemaess werden an einem isolierten Seil Fuellstandselektroden mit gemeinsamer Gegenelektrode oder der Behaelterwandung infolge der unterschiedlichen Leitfaehigkeit des Fuellgutes bei entsprechendem Fuellstand im Behaelter Spannungen ausgewertet und in Signale umgesetzt.The invention relates to a device for detecting Fuellstaenden electrically conductive Schuettgueter or liquids in containers. According to the invention, on an insulated cable, filling level electrodes with a common counterelectrode or the container wall are evaluated and converted into signals as a result of the different conductivity of the filling material at a corresponding filling level in the container.

Description

— 2 — Ausfuhrungsbeispiel- 2 - exemplary embodiment

Die Erfindung soll nachstehend an einem Ausfuhrungsbeispiel und einer Zeichnung naher erläutert werden Zum Erfassen definierter Fuüstandshohen von elektrisch leitfahigen Schüttgütern oder Flüssigkeiten, insbesondere Rohbraunkohle, wird an dem Behalter eine Vorrichtung, bestehend aus einem isolierten Seil 1, der Seilaufhängung 8, den Fullstandselektroden 2, der Gegenelektrode 3, der Behalterwandung 4, den Zuleitungen 9,10,11, der Auswerteeinheit 5, der Anzeigeeinheit 6 und der Koppe !einheit 7, angebracht Entsprechend des Füllstandes im Behalter erfolgt aufgrund des Einsatzes unterschiedlicher Werkstoffe fur die Fullstandselektroden 2 und die Gegenelektrode 3 oder der Behalterwandung 4 die Ausbildung galvanischer Elemente in Verbindung mit dem elektrisch leitfahigen Füllgut zwischen der in das Füllgut eingetauchten Fullstandselektroden 2 und der Gegenelektrode 3 oder der Behalterwandung 4 Über die Zuleitung 9 erfolgt die Kopplung zur Auswerteeinheit 5 Zur Vermeidung von Storbeeinflussungen ist bei der Auswahl der Werkstoffe fur die Elektroden 2, 3 oder die Behalterwandung 4 neben einer hohen Spannung entsprechend der elektrochemischen Spannungsreihe auch auf die Beeinflussung des Füllgutes als Elektrolyt auf die Elektroden zu achten In der Auswerteeinheit 5 erfolgt über geeignete Komparatorschaltungen die Auswertung der anliegenden Spannungen zwischen den Elektroden 2, 3The invention will be explained in more detail below to an exemplary embodiment and a drawing For detecting defined footprints of electrically conductive bulk materials or liquids, in particular raw lignite, is on the container a device consisting of an insulated rope 1, the cable suspension 8, the level electrodes 2, the Counter electrode 3, the Behalterwandung 4, the leads 9,10,11, the evaluation unit 5, the display unit 6 and the Koppe! Unit 7, mounted According to the level in the container is due to the use of different materials for the level electrodes 2 and the counter electrode 3 or the Behalterwandung 4 the formation of galvanic elements in conjunction with the electrically conductive filling material between the immersed in the filling material level electrode 2 and the counter electrode 3 or Behalterwandung 4 via the supply line 9, the coupling to the evaluation unit 5 to avoid Storbe In the selection of the materials for the electrodes 2, 3 or the Behalterwandung 4 in addition to a high voltage according to the electrochemical series of influences on the influence of the filling material as an electrolyte to the electrodes pay attention in the evaluation unit 5 via suitable comparator circuits, the evaluation of the adjacent Voltages between the electrodes 2, 3

Über die Zuleitung 10 erfolgt in der Anzeigeeinheit 6 die optische Darstellung des Füllstandes entsprechend den definierten FullstandshohenAbout the supply line 10 is carried out in the display unit 6, the optical representation of the level corresponding to the defined full-height

UberdieZuleitungH erfolgt die Weiterleitung derSignaleandie Koppelet η heit 7, mit deren Hilfe die Ankopplung beispielsweise eines Mikrorechners, einer Fernanzeige möglich istVia the feed line, the signals are forwarded to the coupling unit 7, with the aid of which the coupling of, for example, a microcomputer, a remote display is possible

Zu den Vorteilen der erfindungsgemaßen Losung gehört der einfache mechanische Aufbau, die Unempfindlichkeit gegenüber extremen Einsatzbedingungen (Temperatur), der geringe Wartungsaufwand, eine hohe Funktionssicherheit und die einfache Verarbeitung der elektrischen Signale Die Festlegung der Anzahl der Fullstandselektroden 3 sowie deren Positionierung an dem isolierten Seil 1 hat entsprechend der Abmessungen des Behalters sowie der angewandten Technologie zu erfolgenAmong the advantages of the solution according to the invention is the simple mechanical structure, the insensitivity to extreme conditions of use (temperature), low maintenance, high reliability and ease of processing the electrical signals The determination of the number of level electrodes 3 and their positioning on the insulated rope. 1 shall be made according to the dimensions of the container and the technology used

Claims

Invention claim:

Apparatus for detecting different filling levels of electrically conductive bulk materials or liquids in containers, characterized by the arrangement of a plurality of height-offset level electrodes on an insulated rope mounted in the container, the application of different materials in terms of the electrochemical series for the level electrodes to a counter electrode or the container wall, the Formation of galvanic elements at the level of the immersed fill level electrode in conjunction with the product as electrolyte and the counter electrode or the container wall, the evaluation of the applied voltages of the galvanic elements via a suitable electronic evaluation unit, the visual representation of the level via a display unit and the forwarding the level signal via a Koppeieinheit.

For this 1 page drawing

Field of application of the invention

The invention relates to a device for detecting fill levels of electrically conductive bulk materials and / or liquids in containers.

Characteristic of the known technical solutions

It is known to scan the level of electrically conductive substances next to other measuring devices in containers with staggered mounted electrical probes by means of the electrical conductivity of the respective bulk material or the liquid and evaluate, for example by means of an electronic circuit and / or display. The measuring probes are thereby switched in a circuit passing through a common electrode or the container wall, which is closed by raising the filling level to the electrode of the probes, which are otherwise insulated from contact. In connection with dry, normally flowing bulk materials with constant electrical conductance, this principle has already proven itself many times. Difficulties arise in the detection of the levels of bridging or charging inclined bulk goods and bulk materials whose electrical conductivity changes in large areas, such as lignite coal. It comes in many cases to incorrect measurements by not suitable evaluation technique for bridging and large changes in the electrical conductivity, when solving large caking in containers for the deformation of probes and when using multiple probes to their contact with each other. Other known measuring devices are based on a submerged insulated probe, which scans the surface of the bulk material or the liquid by means of a tracking control.

Such measuring devices mean a high structural complexity and multiple disturbances under harsh operating conditions such as dust, temperature fluctuations, humidity. Furthermore, in many known measuring devices, digital measured values are converted by appropriate evaluation units into a quasi-analog signal, thus for digital further processing, such as e.g. the input into a microcomputer can not be used.

Object of the invention

The aim of the invention is to develop a device for detecting different filling levels of electrically conductive substances in containers with particular attention to harsh operating conditions, easy maintenance and servicing and the disadvantages of known technical solutions.

Explanation of the essence of the invention

The invention has for its object to develop a device for detecting levels in containers, which scans and displays various defined level levels.

According to the invention the object is achieved by the attached to an insulated rope level electrodes in conjunction with a common counter electrode or the container wall due to the different metals on the electrically conductive filling of the container as an electrolyte at a corresponding level form a galvanic element. The voltages of these galvanic elements are converted into quasi-digital signals via an electronic evaluation unit. By means of an electronic display unit, the visual representation of the level takes place. For further processing of the level information z. As microcomputer coupling, remote display, a coupling unit is arranged.