CS198528B1 - Connection of control center for communication with intrinsically safe telephones - Google Patents

Abstract

Connection of a dispatching exchange for communication with intrinsically safe telephones. The invention is from the field of connection technology in a deep mine. The invention relates to the connection of a dispatching exchange for communication with intrinsically safe telephones, particularly suitable for a dispatching position in a deep mine with a risk of methane explosion. The essence lies in the fact that the subscriber lines are connected via a switching field to electrical signaling circuits, while the vertical outputs of the switching field are connected to electronic supervisory circuits and a switching field of the line to the automatic telephone exchange and are terminated by the intercom sets of the control stations, equipped with occupancy signaling, as can be seen from the figure.

Description

The invention relates to the connection of a control center for communication with intrinsically safe telephones, in particular suitable for control stations of underground mines and the risks of methane explosion.

To date, a number of different wiring of dispatching exchanges are known which, however, only allow communication with conventional telephone sets. They do not allow the use as intrinsically safe phone stations. The control panel has not yet been designed for these terminals. The usability of intrinsically safe telephones, which are a desirable call link especially for environments with a risk of methane explosion, has been greatly limited and these devices could not be used, for example, to dispatch control of the safety of underground mines.

These disadvantages are reduced by the use of the intrinsically safe communication center of the present invention in that the subscriber lines are connected via a switch box to electronic signal circuits, wherein the vertical outputs of the switch box are connected to the electronic supervisory circuits and the switch box to the automatic telephone exchange and are terminated by speech sets of control workplaces equipped with busy signaling and is connected via the switching circuit to the ringing circuit, the lines to the automatic telephone exchange connected to the horizontal inputs of the switching field are terminated by signaling circuits and connected to the subscriber wiring through coupling circuits.

The advantage of the circuitry according to the invention is that it makes it possible to establish commutative conversations between the dispatcher, the subscribers of the automatic telephone or automatic telephone exchange, and the network of intrinsically safe subscriber stations. This greatly extends the applicability of intrinsically safe telephones, especially for the purposes of production control and safety at the mine with the risk of methane explosion. Furthermore, it is possible to operate the network of intrinsically safe subscriber stations from one or more service workstations, while assuring that the subscriber is occupied with calls from other workstations and their signaling. The connection according to the invention also allows the maximum use of speech links by allowing on the line occupied by the subscriber call to still have an independent dispatcher call to the subscriber of an automatic telephone or league network. Finally, the appropriate design of the signaling and supervisory circuit, together with the alignment and the ringing unit, allow for standard type stations to be connected to the control panel in addition to intrinsically safe subscriber stations.

In the drawing, one exemplary embodiment of the wiring of a control center for communication with intrinsically safe telephones according to the invention is shown in block diagram.

The subscriber lines 10 of the intrinsically safe stations pass in the switch box 6 through a chain of switch contacts of the subscriber relays belonging to the n-subscriber and k-connections and terminated by electronic signaling circuits 2. Similarly, the lines 11 are arranged in the switch signal circuits 6. The electronic signal circuit J consists essentially of a switching transistor provided with an isolating and matching transformer, an amplitude limiter, a rectifier

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198 528 and a sensitivity adjustment circuit. The vertical exits of the switch boxes 4 and 6 form call lines and are connectable to the respective operator sets 2 each separately, the interconnection of the line and automatic lines being interconnected by means of coupling circuits 8. In addition, the vertical exits circuits 2 and arranged in such a way that besides the intrinsically safe one can also use telephones of common type in the dedicated part of the PBX in addition to intrinsically safe, they are divided by switching contacts of ringing relays into two parts. the ring circuit 6 and the called party, to the second part, the call set and the calling party. At rest both parts are connected to each other and to the electronic supervisory circuit 2.

The electronic ring circuit 6 produces a ring signal for ringing both intrinsically safe phones and conventional telephone stations. Since the arrangement of the call lines allows the subscriber station system to be operated from one or more service stations 2, in the block diagram the kth and nth subscribers are indicated by dashed lines, all the workstations are equipped with signaling circuits 6 for signaling the occupation of the subscriber given workplace. This signaling is triggered only upon request when the operator of one of the workstations presses the subscriber button of the speaking subscriber.

Claims (1)

Connection of a control panel for communication with intrinsically safe telephones, characterized in that the subscriber lines (10) are connected via a switching field (4) to the electronic signaling circuits (1), the vertical outputs of the switching field (4) being connected to electronic monitoring circuits (2) and a switching field (5) of the line (11) to the automatic telephone exchange and are terminated by speech sets (7) of control workplaces provided with busy signaling (9) and further the switching circuit (4) is connected to the ringing circuit (3); wherein the lines (11) to the automatic telephone exchange connected to the horizontal inputs of the switching field (5) are terminated by signal circuits (6) and connected to subscriber lines (10) via coupling circuits (8).