CN201106455Y - Flameproof and intrinsically safe signal isolator for coal mine - Google Patents

Abstract

The utility model discloses a flameproof and intrinsically safe signal isolator for coal mines, which is characterized in that it consists of a first transceiver, a second transceiver, a first controller, a second controller and first, second, The third and fourth isolators are composed, the first transceiver is connected to the first isolator in series with the second transceiver, and the second isolator in the second transceiver is connected to the first transceiver; the first transceiver The device receives the signal of the first controller, and the second transceiver receives the signal of the second controller; the first controller is connected with the third isolator in series with the second controller, and the second controller is connected with the fourth isolator in series with the first A controller connection. Its remarkable effects are: simple structure, small size, low price, reliable performance, and at the same time, to prevent the sudden increase of voltage and current due to non-intrinsically safe terminals, the fuse and varistor can ensure that the internal circuit of the isolator will not be burned out.

Description

Flameproof and intrinsically safe signal isolator for coal mine

technical field

The utility model belongs to a safety explosion-proof device for underground use, in particular to an explosion-proof and intrinsically safe signal isolator for coal mines.

Background technique

The safety standards of the high and low voltage switches on the market are only flameproof but not intrinsically safe. In this case, connecting the communication lines to the substation directly through the intrinsically safe junction box is not in line with the safety of coal mines. procedures. Therefore, an isolating device is needed to connect the power transmission substation of the power grid monitoring system with the communication line of the high and low voltage switch. At present, there is a JK-1 transmission interface used in the KJ91 coal mine safety monitoring system of Nanjing Fuye Technology Co., Ltd. on the market. Signal transmission between ZJB-30FD mining explosion-proof and intrinsically safe wind power locking devices (monitoring substations). There are also S2008 explosion-proof zener safety barriers in the S2000 series produced by Luoyang Yixing Petrochemical Electrical Instrument Equipment Co., Ltd., and the S800 series intrinsically safe zener safety barriers developed by Shanghai Anzhi Electric Development Co., Ltd., etc. The KJA9 safety isolator developed by Tiandi Technology Co., Ltd., Changzhou Automation Research Institute, General Academy of Coal Science Research, this safety isolator realizes the isolated transmission of non-intrinsically safe RS485 signals and intrinsically safe RS485 signals. However, these safety barriers all have the characteristics of large volume and high price.

The disadvantage of traditional technology is that there is no flameproof and intrinsically safe signal isolator suitable for small size and low price.

Utility model content

The purpose of this utility model is to provide a kind of simple structure, small size coal mine flameproof and intrinsically safe signal isolator.

In order to achieve the above purpose, the key of a flameproof and intrinsically safe signal isolator for coal mines described in the present invention is: a first transceiver, a second transceiver, a first controller, a second controller and The first isolator, the second isolator, the third isolator, and the fourth isolator are composed, wherein the input/output terminals A and B of the first transceiver and the second transceiver receive and send external signals respectively, and the first After the information output terminal RO of the transceiver is connected to the first isolator, it is connected to the information input terminal DI of the second transceiver. After the information output terminal RO of the second transceiver is connected to the second isolator, it is connected to the second isolator. The information input terminal DI of a transceiver is connected, and the communication information is transmitted between the first transceiver and the second transceiver;

The receiving enable terminal /RE and the output enabling terminal DE of the first transceiver are connected to the control output terminal Q3 of the first controller in parallel to receive the control signal of the first controller, and the second transceiver The receiving enabling terminal /RE and the output enabling terminal DE are connected to the control output terminal Q2 of the second controller in parallel to receive the control signal of the second controller;

The control output terminal /Q1 of the first controller is connected to the clear terminal /CLR2 of the second controller after the third isolator is connected in series, and the control output terminal /Q4 of the second controller is connected in series After the fourth isolator is connected, it is connected to the clear terminal /CLR1 of the first controller, and the first controller and the second controller transmit control information to each other.

Both the first isolator and the second isolator are optocouplers, the first transceiver and the second transceiver are 485 communication interface chips, and when one of the two communication chips is a sending end 485 communication interface chip, the other It is the receiving end 485 communication interface chip, the information output terminal RO of the sending end 485 communication interface chip is connected to the cathode of the optocoupler input end, the anode string resistor of the optocoupler input end is connected to the positive pole of the power supply; the emitter of the optocoupler output end is grounded , the collector of the output terminal of the optocoupler is connected to the positive power supply through a pull-up resistor, and the collector of the output terminal is connected to the DI pin of the information input terminal of the 485 communication interface chip at the receiving terminal.

The third isolator and the fourth isolator are optocouplers, the first controller and the second controller are monostable triggers, and one of the two controllers (U3, U4) is to control the 485 communication sending end chip When the monostable trigger is used, the other is to control the monostable trigger of the 485 communication receiving end chip, wherein the negative pulse output terminal /Q1 or /Q2 of the monostable trigger controlling the 485 communication sending end chip is connected to the The cathode of the optocoupler input terminal, the anode series resistor of the optocoupler input terminal is connected to the positive pole of the power supply, the emitter of the optocoupler output terminal is grounded, and the collector series resistor of the optocoupler output terminal is connected to a high level. The CLR connection of the clearing end of the monostable flip-flop at the receiving end is connected.

A piezoresistor D is connected between the input/output terminals A and B of the first transceiver, and the input/output terminals A and B are respectively connected in series with fuses to be connected to the outside world.

The power isolation module DC3 is used in the isolator. The power isolation module (DC3) provides a power supply for the first transceiver (U1) and the first controller (U3), and provides a power supply for the second transceiver (U2) and the second controller. The device (U4) provides another power supply. The power supplies at the two ends of the first isolator, the second isolator, the third isolator and the fourth isolator are isolated to enhance the anti-interference ability of the utility model.

This design adopts a combination of fuse type and photoelectric isolation structure. In order to ensure the accurate transmission of the RS485 signal of the signal isolator, the models of the first transceiver and the second transceiver are 75LBC184 chips, and the two are connected back to back. The first controller and The model of the second controller is 74HC123 monostable flip-flop, which controls two 75LBC184 chips respectively.

Between the two 75LBC184 chips and between the control signals of the 74HC123 monostable trigger, optocouplers are used for signal isolation, so as to ensure that the communication signals and control signals are less interfered. At the same time, to prevent the sudden increase of the voltage and current of the non-intrinsically safe terminal, connect two fuses in series and a varistor in parallel at both ends of the RS485 incoming line, so that when the non-intrinsically safe terminal has an abnormal overvoltage and current increases, it is guaranteed The internal circuit of the isolator will not be burned out. At the same time, the power isolation module is adopted to enhance the anti-interference ability of communication information.

The remarkable effects of the utility model are: simple structure, small size, low price, reliable performance, and at the same time, preventing the sudden increase of the voltage and current of the non-intrinsically safe terminal, the fuse and the piezoresistor can ensure that the internal circuit of the isolator will not be burned out .

Description of drawings

Fig. 1 is the schematic circuit diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1, a flameproof and intrinsically safe signal isolator for coal mines consists of a first transceiver U1, a second transceiver U2, a first controller U3, a second controller U4, a first isolator, a second Composed of two isolators, a third isolator, and a fourth isolator, wherein the input/output terminals A and B of the first transceiver U1 and the second transceiver U2 receive and send external signals respectively, and the first transceiver U1 After the information output terminal RO is connected to the first isolator in series, it is connected to the information input terminal DI of the second transceiver U2. After the information output terminal RO of the second transceiver U2 is connected to the second isolator, it is connected to the first isolator. The information input terminal DI of the transceiver U1 is connected, and the first transceiver U1 and the second transceiver U2 transmit communication information to each other;

The receiving enable terminal /RE and the output enabling terminal DE of the first transceiver U1 are connected in parallel to the control output terminal Q3 of the first controller U3 to receive the control signal of the first controller U3, and the first The receiving enabling terminal /RE and the output enabling terminal DE of the second transceiver U2 are connected to the control output terminal Q2 of the second controller U4 in parallel to receive the control signal of the second controller U4;

The control output terminal /Q1 of the first controller U3 is connected to the clearing terminal /CLR2 of the second controller U4 after the third isolator is connected in series, and the control output terminal /Q1 of the second controller U4 After connecting the fourth isolator in series, Q4 is connected to the clearing terminal /CLR1 of the first controller U3, and the first controller U3 and the second controller U4 transmit control information to each other.

Both the first isolator and the second isolator are optocouplers, the first transceiver U1 and the second transceiver U2 are 485 communication interface chips, and one of the two communication chips U1 and U2 is a 485 communication interface at the sending end chip, the other is the receiving end 485 communication interface chip, the information output terminal RO of the sending end 485 communication interface chip is connected to the cathode of the optocoupler input end, and the anode string resistor of the optocoupler input end is connected to the positive pole of the power supply; the optocoupler The emitter of the output end is grounded, the collector of the optocoupler output end is connected to the positive power supply through a pull-up resistor, and the output end collector is connected to the DI pin of the information input end of the 485 communication interface chip at the receiving end.

The third isolator and the fourth isolator are optocouplers, the first controller U3 and the second controller U4 are monostable triggers, and one of the two controllers U3 and U4 is to control the 485 communication sending end chip When the monostable trigger is used, the other is to control the monostable trigger of the 485 communication receiving end chip, wherein the negative pulse output terminal /Q1 or /Q2 of the monostable trigger controlling the 485 communication sending end chip is connected to the The cathode of the optocoupler input terminal, the anode series resistor of the optocoupler input terminal is connected to the positive pole of the power supply, the emitter of the optocoupler output terminal is grounded, and the collector series resistor of the optocoupler output terminal is connected to a high level. The CLR connection of the clearing end of the monostable flip-flop at the receiving end is connected.

A piezoresistor D is connected between the input/output terminals A and B of the first transceiver U1, and the input/output terminals A and B are respectively connected in series with fuses to connect to the outside world.

A power isolation module is used in the isolator, the power isolation module (DC3) provides a power supply for the first transceiver (U1) and the first controller (U3), and provides a power supply for the second transceiver (U2) and the second controller (U4) provides another power supply. And the power supply at the two ends of the first isolator, the second isolator, the third isolator and the fourth isolator is isolated, which enhances the anti-interference ability of the utility model.

This design adopts a combination of fuse type and photoelectric isolation structure. In order to ensure the accurate transmission of the RS485 signal of the signal isolator, the models of the first transceiver U1 and the second transceiver U2 are 75LBC184 chips, and the two are connected back to back. The first control The model 74HC123 monostable flip-flops of the controller U3 and the second controller U4 control two 75LBC184 chips respectively.

Between the two 75LBC184 chips and between the control signals of the 74HC123 monostable trigger, optocouplers are used for signal isolation, so as to ensure that the communication signals and control signals are less interfered. At the same time, to prevent the sudden increase of the voltage and current of the non-intrinsically safe terminal, connect two fuses in series and a varistor in parallel at both ends of the RS485 incoming line, so that when the non-intrinsically safe terminal has an abnormal overvoltage and current increases, it is guaranteed The internal circuit of the isolator will not be burned out. At the same time, the power isolation module is adopted to enhance the anti-interference ability of communication information.

The signal isolator needs +5V power supply, so it can be imported from the power substation, because the power supply of the power substation is an intrinsically safe power supply, so it is very safe and convenient.

Its working principle is:

The first transceiver U1 is connected to the non-intrinsically safe end, the second transceiver U2 is connected to the intrinsically safe end, and the signal of the non-intrinsically safe end is sent to the first optocoupler U6B for isolation through the first transceiver U1, and then sent to the second The second transceiver U2, the second transceiver U2 sends information to the intrinsically safe terminal, similarly, the signal of the intrinsically safe terminal is sent to the second optocoupler U5B for isolation after the second transceiver U2, and then sent to the first transceiver U1, the second A transceiver U1 then sends information to the non-intrinsically safe end.

The first controller U3 controls the first transceiver U1 to work, the second controller U4 controls the second transceiver U2 to work, and at the same time, the first controller U3 sends control information to the second controller U4 via the third optocoupler U6A, The second controller U4 sends the control information to the first controller U3 via the fourth optocoupler U5A to coordinate the control functions between the two.

Claims (5)

1, a kind of colliery Flameproof intrinsically safe signal isolator, it is characterized in that: by first transceiver (U1), second transceiver (U2), first controller (U3), second controller (U4) and first isolator, second isolator, the 3rd isolator, the 4th isolator is formed, I/O end (the A of first transceiver (U1) and second transceiver (U2) wherein, B) receive and send external information respectively, the information output RO of described first transceiver (U1) goes here and there behind described first isolator, information input terminal DI with second transceiver (U2) is connected again, the information output RO of second transceiver (U2) goes here and there behind described second isolator, information input terminal DI with first transceiver (U1) is connected again, mutual transmission communication information between first transceiver (U1) and second transceiver (U2);

Reception Enable Pin/the RE of described first transceiver (U1) and output enable end DE are attempted by on the control output end Q3 of described first controller (U3), receive the control signal of first controller (U3), reception Enable Pin/the RE of described second transceiver (U2) and output enable end DE are attempted by on the control output end Q2 of described second controller (U4), receive the control signal of second controller (U4);

Control output end/the Q1 of described first controller (U3) goes here and there behind described the 3rd isolator, removing end/CLR2 with described second controller (U4) is connected again, control output end/the Q4 of described second controller (U4) goes here and there behind described the 4th isolator, removing end/CLR1 with described first controller (U3) is connected again, transmission control information mutually between described first controller (U3) and second controller (U4).

2, colliery according to claim 1 Flameproof intrinsically safe signal isolator, it is characterized in that: described first isolator, second isolator are optocoupler, described first transceiver (U1) and second transceiver (U2) are 485 communication interface chips, in two communication chips (U1, U2) one when being transmitting terminal 485 communication interface chips, another is receiving terminal 485 communication interface chips, the information output RO of described transmitting terminal 485 communication interface chips connects the input negative electrode of described optocoupler, connects positive source behind the input anode series resistance of this optocoupler; The grounded emitter of optocoupler output, optocoupler output colelctor electrode is connected with positive supply through pull-up resistor, and this output colelctor electrode connects the information input terminal DI pin of described receiving terminal 485 communication interface chips.

3, colliery according to claim 1 Flameproof intrinsically safe signal isolator, it is characterized in that: described the 3rd isolator, the 4th isolator is an optocoupler, described first controller (U3) and second controller (U4) are monostable flipflop, two controller (U3, U4) one is when controlling the monostable flipflop of 485 communication transmitting terminal chips in, another is the monostable flipflop of control 485 communication receiving terminal chips, wherein control 485 communication transmitting terminal chips monostable flipflop negative pulse output/Q1 or/Q2 connects the negative electrode of described optocoupler input, connect positive source after the anode series resistance of optocoupler input, the grounded emitter of optocoupler output, connect high level after the collector series resistance of optocoupler output, the colelctor electrode of this optocoupler output also is connected with the removing end/CLR of described receiving terminal monostable flipflop.

4, colliery according to claim 1 Flameproof intrinsically safe signal isolator, it is characterized in that: be connected with piezo-resistance D between the I/O end of described first transceiver (U1) (A, B), described I/O end (A, B) also is serially connected with fuse respectively and links to each other with the external world.

5, colliery according to claim 1 Flameproof intrinsically safe signal isolator, it is characterized in that: also be provided with power isolation module (DC3), this power isolation module (DC3) is that first transceiver (U1) and first controller (U3) provide one road power supply, is that second transceiver (U2) and second controller (U4) provide another road power supply.

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