RU2364024C2 - Remote mine indication system with remote power source - Google Patents

Abstract

FIELD: communication facilities.

SUBSTANCE: invention concerns industrial communications and can be applied in operational dispatch management at coal mines. System of remote indication in mines operates over occupied phone pair when analogue speech signal in it disappears. Remote mechanical devices are connected to the common communication line automatically when voltage level in line changes. Speech signals have priority.

EFFECT: cost efficiency due to reduction of the number of communication lines set in complicated underground conditions.

1 dwg

Description

The invention relates to the field of industrial and technological communications in mining enterprises, in particular in coal mines, including hazardous gas and dust.

A device for mine telesignalization [1] is known, intended for collecting and transmitting compressed information to a central control center (control point) via a free two-wire communication line from on-off discrete yes-no sensors located at an underground controlled point. Separation of channels - temporary, with the help of clock distributors. An important feature of the equipment is the presence of remote power supply to the circuit of the controlled point via an information communication line.

There is also known a system of mine telesignals with remote power [2]. The system works on the principle of two-way (duplex) communication between the central device of the control point (PU) and the peripheral units of the controlled points (CP) with time separation of signals and has remote power supply to the control units. Information transmission and remote power supply are carried out via one dedicated (free) telephone pair.

At the same time, at the output of the control circuitry, a bipolar alternating voltage is supplied to the communication line, which is the clock frequency for all gearbox units connected to this line. Information signs of control signals are the same clock pulses, but with a 2–3 times longer duration, both positive and negative polarity. This voltage of clock pulses is also used to power the electrical circuits of the gearbox units.

The reverse transmission of information to the control panel (tele-signaling) is carried out according to the “current loop” principle by short-term short-circuiting of the communication line at certain distributor clock cycles.

The system comprises a control center diagram of the control unit and one or more control unit blocks connected in parallel to one communication line that is connected to the output of the control circuitry on the surface. Moreover, the control circuit contains a controlled source of alternating voltage, which in turn consists of a constant voltage source and a polarity switch for converting unipolar pulses into bipolar pulses supplied to the communication line, a threshold unit for receiving current signals from the control unit and a control circuit (control device), which in turn consists of the following elements: a distributor, an inverter, a clock generator, two keys, a delay unit, a pulse shaper, a parallel code converter serial, an OR gate, matching elements.

In addition, the underground part of the system contains a mine subscriber telephone set, which includes a bridge, a ringing device, a capacitor, a reed switch, and a handset with a dialer. In this case, the telephone set is connected directly to the telephone line of the automatic telephone exchange of the telephone exchange through its separate mine two-wire communication line on the surface.

The disadvantage of this tele-alarm system is the need for a free (unoccupied) wire pair between the underground control units and the surface control circuit of the control unit, which requires the laying of new wire lines in especially difficult mining conditions when putting the systems into operation.

To eliminate this drawback, it is proposed to use a busy telephone pair as a communication line by connecting one or more KP units to a busy telephone pair in parallel with an underground subscriber telephone, the voice signal of which is analog.

The purpose of the invention is cost savings by reducing the number of paved communication lines in difficult underground conditions.

The goal is achieved by the fact that the following is introduced into the surface circuit of the control room: an isolation transformer, the primary winding of which through the output circuit of the optoelectronic switch is connected to a two-wire telephone exchange line, in parallel with which the ring voltage detection circuit is connected, the first wire of the transformer secondary winding is supplied through threshold devices connected in series, to the first input of the voltage polarity switch, and the second wire of the secondary winding of the transformer through series-connected current regulator, voltage switch, the DC voltage source - the second input switch polarity voltages. Part of the control device is functionally similar to the control circuit of the prototype, but is implemented in the microcontroller with the corresponding program. In the underground part, zener diodes were introduced at the input of each control unit, and a threshold device was introduced into the telephone set.

The drawing shows a diagram of a mine telesignal system. The system consists of a surface control station and an underground part. The control point 1 of the system contains a circuit for determining the ring voltage 2, the inputs of which are connected in parallel to the two-wire line of the ATC 3, and the output is connected to the input of the control device 4, powered by the power supply 5, an isolation transformer 6 connected by the primary winding to one wire of the two-wire line of the ATC 3 and the output of the optoelectronic switch 7, the second output of which is connected to the other wire of the two-wire ATC 3 line, the secondary winding of the transformer 6 is connected between the pore inputs connected in series devices 8 and 9 and the output of the current stabilizer 10, the power of which is provided through the voltage switch 11 from the power supply 12 or 13. The negative outputs of the power supplies 12 and 13 are connected to the first switching input of the voltage polarity switch 14, the second switching input of which is connected to the threshold input devices 9, the switching outputs 14 are connected to the mine telephone line 15. The outputs of the threshold devices 8 and 9 are connected to the corresponding inputs of the control device 4, and the inputs of the switch are polar 14 and 11 and the switch voltages to the respective outputs of the control device 4 (microcontroller).

The underground part of the system includes one or more blocks of monitored points (KP) 16 and a mine telephone set 18. The KP 16 is connected in parallel to the mine telephone line 15 through zener diodes 17. The shaft telephone apparatus 18 includes a threshold device 19, the controlled input of which is connected to the positive output of the diode bridge 20, and the switching output is connected between the negative output of the bridge 20 and one of the power inputs of the calling device 21. The AC inputs of the diode bridge 20 are connected through ensator reed 22 and the lever shaft to the telephone line 15. Through the other terminal of the switch lever 23 is connected to the line with the handset 24 dialer.

The system has two operating modes: a telephone communication mode, which is set if the tube of the mine telephone set 18 is picked up or a call signal is received on a two-wire line, and a telealarm signal transmission mode.

In the transmission mode of the telealarm system, the system operates as follows: the control device 4 controls the voltage switch 11, which forms a high logic level at the input of the circuit, which corresponds to the connection of the power source 12, the output of which is set to +48 V. With the receiver of the mine telephone set 18 to line 15 through the reed switch lever 23 connected to the calling device, therefore, the current telephone 18 is not consumed. On line 15, a voltage of 48 V is set, which is sufficient to open the zener diodes 17, the stabilization voltage of which is 24 V. Thus, a 24 V supply voltage is set at the inputs of the KP 16. The control device 4 controls a polarity switch 14, which generates control pulses that ensure the formation of in the line of the mine telephone line 15, clock pulses and polling pulses of the CP of different polarity in accordance with the logic of the system. KP generates current pulses of current 3 ... 4 mA in the corresponding polling cycles. These pulses trigger the threshold device 8 and are transmitted to the input of the control device 4. At the same time, the threshold device 9 does not work, because it is set to a current greater than 10 mA. The threshold device 19 also does not work, since it is set to a voltage level above 50 V.

In telephone mode, the system operates as follows: when the handset is removed from the telephone 18, the reed switch is activated 23 and current flows through line 24 through line 24. Since the current on line 15 is limited by a current regulator 10 at 20 mA, the voltage on the line drops to 12 ... 18 V, the zener diodes 17 are closed and no power is supplied to the inputs of the KP 16. At the same time, a threshold device 9 is triggered, which transmits a line occupancy signal to the control device 4. In accordance with the program, the control device 4 stops the generation of synchronization and polling pulses of the control unit and generates a high logic level at the input of the voltage switch circuit 11, which corresponds to the connection of the power supply 13, the output of which is set to +72 V. At the same time, a high logical level is set at the input of the optoelectronic switch 7, when triggered, the loop of the two-wire exchange ATS 3 is closed. The conversation signal is transmitted from the exchange 3 via a matching trans formator 6 to the mine communication line 15. Thus, a conversation path is formed between the telephone exchange line 3 and the telephone telephone 18. When a ring voltage is received from the telephone exchange 3, a low level signal is generated at the output of the ring voltage determination circuit 2, the control device 4 To the program through the switches 11 and 14, an alternating voltage with an amplitude of 72 V is generated. In the mine telephone set 18, a threshold device 19 is activated that is tuned to a voltage level above 50 V, which in turn q leads to the operation of the calling device 21 and the formation of a call signal to the subscriber from the side of the PBX line 3.

Thus, it becomes possible to carry out telephone communication with underground sections of the mine and transmit telemechanical information on one common two-wire line. This will save a significant amount of money by reducing the number of newly laid communication lines in difficult coal mine conditions.

The operation of this communication system is controlled automatically without the participation of a dispatcher or operator.

Information sources

1. A.S. USSR No. 919108.

2. A.S. USSR No. 1243141.

Claims (1)

A remote-powered shaft mine alarm system containing a constant voltage source for remote power supply and information transmission via a communication line in the control room, a threshold device, a voltage polarity switch and a control device, the first and second control outputs of which are connected to the control inputs of the voltage polarity switch, and in underground part - one or more blocks of controlled points connected in parallel to the communication line, and a mine telephone set containing a diode a bridge, the AC voltage inputs of which are connected through a capacitor and a contact of a reed switch to a communication line, to which a telephone handset with a dialer is also connected via another contact of a reed switch, and the positive and negative terminals of the diode bridge are connected to a call device, characterized in that, with In order to save money by reducing laid communication lines in difficult underground conditions, an isolation transformer and a primary winding were introduced at the control point which through the output circuit of the optoelectronic key is connected to the automatic telephone exchange communication line of the telephone exchange, a ring voltage determination circuit, the inputs of which are connected in parallel to the telephone exchange of the telephone exchange, and its output is connected to the first input of the control device, a current stabilizer, a voltage switch, a second DC voltage source and a second a threshold device, while the positive terminals of both voltage sources are connected through the corresponding switches of the voltage switch to the input of the current stabilizer, the output to through the secondary winding of the isolation transformer and serially connected first and second threshold devices are connected to the first input of the voltage polarity switch, and the negative terminals of both voltage sources are combined and connected to the second input of the voltage polarity switch, the third and fourth outputs of the control device are connected to the corresponding inputs of the voltage switch and the fifth output of the control circuit is connected to the input of the optoelectronic switch, the outputs of the first and second threshold devices are connected respectively to the second and third inputs of the control device, the outputs of the voltage polarity switch are connected respectively to the first and second wires of the communication line, and zener diodes are introduced in the underground part, through which each unit of the controlled point is connected to the communication line, a third threshold is introduced into the telephone circuit a device whose controlled input is connected to the positive terminal of the diode bridge, and the switching element is connected between the negative terminal of the diode bridge and one of the power inputs of the calling device, the telephone is connected to the communication line in parallel with the blocks of the controlled point.