DE689761C - Circuit for firedamp proof operation of photocells - Google Patents
Circuit for firedamp proof operation of photocellsInfo
- Publication number
- DE689761C DE689761C DE1938S0132213 DES0132213D DE689761C DE 689761 C DE689761 C DE 689761C DE 1938S0132213 DE1938S0132213 DE 1938S0132213 DE S0132213 D DES0132213 D DE S0132213D DE 689761 C DE689761 C DE 689761C
- Authority
- DE
- Germany
- Prior art keywords
- firedamp
- photocell
- circuit
- proof
- photocells
- 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.)
- Expired
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 7
- 230000001681 protective effect Effects 0.000 claims 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F9/00—Devices preventing sparking of machines or apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Amplifiers (AREA)
Description
Schaltung für schlagwettersicheren Betrieb von Fotozellen Im Bergbau unter Tage sollen vielfach Fotozelleneinrichtungen, die mit einer Vorspannungsquelle gespeist werden und mit Verstärkern zusammenarbeiten, z. B. für die BetätiguAg von Wettertüren, die Zählung von Loren, Bündigstellen von Fahrkörben o. dgl., verwendet werden. Derartige Einrichtungen können daher bei Zerstörung, zumal die Fotozelle lichtzugänglich sein muß, zur Entzündung von Schlagwettern führen. Die Verwendung von drucksicherem Glas vor der Fotozelle führt nicht ohne weiteres zum Ziele, weil infolge der starken Absorption des Glases die Anwendung desselben mit drucksicheren Stärken nicht ohne weiteres im Strahlengang der Fotozelle möglich ist. Allgemein läßt es sich wohl erreichen, daß z. B. die Verstärker-und Stromversorgungseinrichtung in einem nicht den Schlagwetterbestimmungen unterworfenen Raum untergebracht werden können. Das ist aber für die Fotozellen nach den hierüber gemachten Ausführungen nicht möglich. Ebenso ist aus den genannten Gründen eine Unterbringung in schlagwettergeschützten Behältern für die Fotozelle nicht möglich.Circuit for firedamp proof operation of photocells in mining Underground photocell devices with a bias voltage source should often be used are fed and cooperate with amplifiers, e.g. B. for the actuation of Weather doors, counting of carts, leveling of cars o. The like. Used will. Such devices can therefore be destroyed, especially the photocell must be accessible to light, lead to the ignition of firedamp. The usage of pressure-proof glass in front of the photocell does not necessarily lead to the goal, because due to the strong absorption of the glass, the use of the same with pressure-proof Strengthening is not easily possible in the beam path of the photocell. Generally can it be achieved that z. B. the amplifier and power supply device be accommodated in a room that is not subject to the firedamp regulations can. But that is for the photocells according to the explanations given above not possible. For the reasons mentioned, accommodation in firedamp-proof rooms is also essential Containers for the photocell not possible.
Nach der Erfindung wird die Schlagwettersicherheit der Fotozelle dadurch erreicht, daß in alle ihre Zuleitungen so .große Widerstände gelegt werden, daß eine Auftrennung oder ein Kurzschluß dieser Leitungen bei Zerstörung keine eine Entzündung von Schlagwettern herbeiführende Spannung oder Stromstärke zulassen. Die Widerstände, die diesen Bedingungen genügen, halten sich im allgemeinen in der Größenordnung der Koppelwiderstände der Fotozelle und begrenzen auch bei Kurzschließung der Fotozelle den auftretenden Strom auf wenige Mikroampere.According to the invention, the firedamp safety of the photocell is thereby achieved that in all their leads so .large resistances are placed that a disconnection or a short-circuit of these lines in the event of destruction is not one Allow ignition of fire weather causing voltage or amperage. The resistors that meet these conditions are generally in the range Order of magnitude of the coupling resistances of the photocell and also limit in the event of a short circuit the photocell reduces the current occurring to a few microamps.
Nach weiterer Erfindung müssen größere Kapazitäten, die aus irgendwelchen schalttechnischen Gründen parallel zur Fotozellenleitung liegen, zwischen Widerstand und Verstärker eingeschaltet werden; überhaupt muß die Zuleitung zur Fotozelle in an sich bekannter Weise durch ,ein kapazitätsarmes Kabel erfolgen, damit nicht die Kapazitäten über die hohen Widerstände auf größere Energiebeträge aufgeladen werden können.According to a further invention, larger capacities must come from any for technical reasons are parallel to the photocell line, between the resistor and amplifiers are switched on; at all, the lead to the photocell must be in In a manner known per se, a low-capacitance cable is carried out, so that not the Capacities can be charged to larger amounts of energy via the high resistances can.
In den Fig. i und a ist eine Schaltungsanordnung nach der Erfindung dargestellt. In Fig. i ist i die Fotozelle, die durch das Kabel mit dem in einen den Schlagwetterbestimmungen nicht unterworfenen Raum oder in einen schlagwettersicheren Kasten untergebrachten Verstärker 3 bzw. mit dessen Verstärkerrohr q. verbunden ist. Datei erfolgt erfindungsgemäß die Zuleitung zur Fotozelle je über die Reihenwiderstände 5 und 6 in jeder der Zuleitungen. Wenn der Ankopplungswiderstand 7 etwa i o Megohm wie üblicherweise beträgt, so ist die Größenordnung der Widerstände 5 und 6 etwa i Megohm.In Figs. I and a is a circuit arrangement according to the invention shown. In Fig. I i is the photocell that is connected to the in one by the cable The room not subject to firedamp regulations or in a firedamp-proof room Box housed amplifier 3 or with its amplifier tube q. tied together is. According to the invention, the feed line to the photocell takes place via the series resistors 5 and 6 in each of the leads. If the coupling resistance 7 is about 10 megohms as is usually the case, the order of magnitude of the resistors 5 and 6 is approximately i megohms.
In der Fig. 2 sind die beiden Reihen-Widerstände 5i1 und 6a innerhalb einer Durchführung untergebracht.In Fig. 2, the two series resistors 5i1 and 6a are inside housed in an implementation.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1938S0132213 DE689761C (en) | 1938-05-18 | 1938-05-18 | Circuit for firedamp proof operation of photocells |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1938S0132213 DE689761C (en) | 1938-05-18 | 1938-05-18 | Circuit for firedamp proof operation of photocells |
Publications (1)
Publication Number | Publication Date |
---|---|
DE689761C true DE689761C (en) | 1940-04-02 |
Family
ID=7538998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1938S0132213 Expired DE689761C (en) | 1938-05-18 | 1938-05-18 | Circuit for firedamp proof operation of photocells |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE689761C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1008159B (en) * | 1956-03-05 | 1957-05-09 | Landis & Gyr Ag | Intrinsically safe control circuit in potentially explosive systems for remote pulse measuring devices |
DE1014888B (en) * | 1956-06-30 | 1957-08-29 | Funke Huster Elektrizitaets | Signaling device for mining |
DE1029712B (en) * | 1954-08-31 | 1958-05-08 | Siemens Ag | Gas remote metering system working with current pulses |
DE1030428B (en) * | 1955-02-02 | 1958-05-22 | Licentia Gmbh | Scanning head for register controller |
DE1099074B (en) * | 1956-12-07 | 1961-02-09 | Gilbert & Barker Mfg Co | Device for monitoring the earthing device of a fuel tank |
-
1938
- 1938-05-18 DE DE1938S0132213 patent/DE689761C/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1029712B (en) * | 1954-08-31 | 1958-05-08 | Siemens Ag | Gas remote metering system working with current pulses |
DE1030428B (en) * | 1955-02-02 | 1958-05-22 | Licentia Gmbh | Scanning head for register controller |
DE1008159B (en) * | 1956-03-05 | 1957-05-09 | Landis & Gyr Ag | Intrinsically safe control circuit in potentially explosive systems for remote pulse measuring devices |
DE1014888B (en) * | 1956-06-30 | 1957-08-29 | Funke Huster Elektrizitaets | Signaling device for mining |
DE1099074B (en) * | 1956-12-07 | 1961-02-09 | Gilbert & Barker Mfg Co | Device for monitoring the earthing device of a fuel tank |
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