CN212250151U

CN212250151U - Methane sensor for coal mine

Info

Publication number: CN212250151U
Application number: CN202020789798.3U
Authority: CN
Inventors: 赖建; 梁立勋; 邬自然; 黄洋; 唐雨; 刘帅; 严明; 郭小明; 岳伟; 杨阳; 苟林坤; 李多智
Original assignee: Sichuan Chuanmei Technology Co ltd
Current assignee: Sichuan Chuanmei Technology Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-12-29
Anticipated expiration: 2030-05-13

Abstract

The methane sensor for the coal mine comprises a multi-path detection device, a multi-path alarm device, a relay device and a wireless receiving device; the multi-path detection equipment has the same structure, and each path of the multi-path detection equipment comprises a voltage-stabilized power supply, a detection circuit, a wireless transmitting circuit and a probe which are arranged in the element box A and connected through a lead; the multiple alarm devices are consistent in structure, and each path of the multiple alarm devices comprises a storage battery, a charging socket, a power switch, a wireless receiving circuit, a buzzer and an eccentric motor which are arranged in the element box B and connected through a lead; the relay equipment comprises a stabilized voltage power supply, a wireless transmitting circuit and a wireless receiving circuit which are arranged in the element box C and connected through a lead; the wireless receiving device comprises a stabilized voltage power supply and a wireless receiving circuit which are arranged in the element box D and connected through a lead. This novel take place can indicate the operation personnel respectively when methane leaks, and relay equipment can also relay the transmission with the signal and give in the ground management room, has prolonged wireless alarm signal transmission distance, has reduced the secondary disaster that gas leakage brought.

Description

Methane sensor for coal mine

Technical Field

The utility model relates to a coal mine safety equipment technical field, especially a methane sensor for coal mine.

Background

In the process of underground mining of the coal mine, harmful gases gushing out from the coal rock mass are collectively called mine gas. The main components of the gas are methane and other combustible gases. Gas explosion is one of the most serious disasters in coal mine production, so that the prevention of gas accidents is the key point of coal mine safety production, and the development of a gas sensor system with high reliability and high stability has great significance for coal mine safety production. The existing gas sensor for the coal mine can only realize fixed-point alarm generally, namely, the alarm sensor is arranged in a fixed-point area, and because a plurality of operators and the sensing alarm are far away from each other, the underground environment of the coal mine is complex under the actual condition, various noises around the coal mine are large, and all underground personnel can not hear the alarm sound sent by the sensor when gas leakage occurs, so that serious potential safety hazards exist.

In order to realize effective monitoring, the existing underground gas alarm sensor for the coal mine adopts a wireless signal transmitting mode besides underground field alarm, and underground alarm is transmitted to an aboveground monitoring department or personnel, so that when gas leakage occurs, the underground and aboveground personnel linkage (such as aboveground personnel are ready for rescue in real time) is realized, and secondary disasters caused by the gas leakage are reduced to the minimum degree. Under the actual conditions, because the underground environment is complicated, and there are various consumer to produce electromagnetic interference, consequently, current colliery is with gas alarm sensor down in the pit can't effectively guarantee can transmit warning radio signal to ground, and then can't inform ground monitoring personnel or departments, when taking place gas leakage, just also can't form on the well and personnel's linkage in the pit, can't effectively reduce the secondary disaster that gas leakage brought.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that the prior gas alarm sensor for underground coal mines can not effectively prompt each operator when alarming on site, and can not effectively ensure that the alarm signal can be transmitted to the ground due to various reasons when the alarm signal is sent by wireless signals, thereby being incapable of effectively ensuring the safe production of the coal mine, the utility model provides a gas leakage monitoring in a plurality of directions under the coal mine can be realized under the combined action of various mechanisms and circuits, when the gas leakage occurs, not only can the alarm sound be generated on site, but also the alarm equipment carried by each operator can give out sound-light and vibration prompts, so that the underground personnel can know the alarm situation as soon as possible and take corresponding self-rescue measures, and after the alarm signal occurs, the relay equipment can relay and transmit the wireless alarm signal on site, thereby prolonging the transmission distance of the wireless alarm signal, the coal mine methane sensor ensures that ground monitoring department personnel can receive gas leakage alarm signals in time as far as possible, thereby achieving the linkage of personnel above and below the mine, taking rescue measures as soon as possible and reducing secondary disasters caused by gas leakage_。

The utility model provides a technical scheme that its technical problem adopted is:

the methane sensor for the coal mine is characterized by comprising a multi-path detection device, a multi-path alarm device, a relay device and a wireless receiving device; the multi-path detection equipment has the same structure, each path of equipment comprises a voltage-stabilized power supply, a detection circuit, a wireless transmitting circuit and a probe, and the voltage-stabilized power supply, the detection circuit, the wireless transmitting circuit and the probe are arranged in the element box A; the detection circuit of the multi-path detection equipment comprises an operational amplifier of type NE5532, a resistor, an adjustable resistor, a diode, a PNP triode, a relay and a buzzer, and the operational amplifier, the resistor, the adjustable resistor, the diode, the PNP triode, the relay and the buzzer are connected through circuit board wiring; in each path of detection equipment, the signal output end of the probe is electrically connected with the signal input end of the detection circuit; the multi-path signal output end of the detection circuit of the multi-path detection equipment is electrically connected with the signal input end of the wireless transmitting circuit of the multi-path detection equipment respectively; the multi-channel alarm equipment has consistent structures, each channel comprises a storage battery, a charging socket, a power switch, a wireless receiving circuit, a buzzer and an eccentric motor, and the storage battery, the charging socket, the power switch, the wireless receiving circuit, the buzzer and the eccentric motor are arranged in an element box B; in each path of alarm equipment, two ends of an output power supply of a wireless receiving circuit are respectively and electrically connected with two ends of a signal sounder and a power supply input of an eccentric motor; the relay equipment comprises a voltage-stabilized power supply, a wireless transmitting circuit and a wireless receiving circuit, wherein the voltage-stabilized power supply, the wireless transmitting circuit and the wireless receiving circuit are arranged in the element box C; in the relay equipment, a multi-path signal output end of a wireless receiving circuit is electrically connected with a multi-path signal input end of a wireless transmitting circuit respectively; the wireless receiving equipment comprises a voltage-stabilized power supply and a wireless receiving circuit, wherein the voltage-stabilized power supply and the wireless receiving circuit are arranged in the element box D.

Furthermore, the stabilized voltage power supply of each path of detection equipment is an alternating current to direct current switching power supply module; the wireless transmitting circuit is a wireless transmitting circuit module.

Furthermore, the probe of each path of detection equipment comprises a probe body with the model number QM-N5, a resistor and an adjustable resistor, wherein the probe body, the resistor and the adjustable resistor are connected through a circuit board in a wiring mode, a first measuring electrode 3 pin of the probe body is connected with one end of the resistor, the other end of the resistor is connected with a positive power supply input end 1 pin of the probe body, a second measuring electrode 4 pin of the probe body is connected with the positive electrode of a diode, and the negative electrode of the diode is connected with one end of the adjustable resistor.

Furthermore, the wireless receiving circuit of each alarm device comprises a wireless receiving circuit module, a resistor, an NPN triode and a light emitting diode, wherein the wireless receiving circuit module, the resistor, the NPN triode and the light emitting diode are connected through circuit board wiring, the pulse output end of the wireless receiving circuit module is connected with one end of the resistor, the other end of the resistor is connected with the anode of the light emitting diode and the base of the NPN triode, and the emitting electrode of the NPN triode is connected with the cathode of the light emitting diode and the cathode power supply input end.

Furthermore, the stabilized voltage power supply of the relay equipment is an alternating current to direct current switching power supply module; the wireless transmitting circuit is a wireless transmitting circuit module; the wireless receiving circuit comprises a wireless receiving circuit module, resistors, NPN triodes and relays, wherein the wireless receiving circuit module and the resistors, the NPN triodes and the relays are connected through circuit board wiring, a positive power supply input end of the wireless receiving circuit module is connected with positive power supply input ends of the four relays, four high-level output ends of the wireless receiving circuit module are respectively connected with one ends of the four resistors, the other ends of the four resistors are connected with bases of the four NPN triodes, emitting electrodes of the four NPN triodes are respectively and electrically connected with negative power supply input ends of the four relays, and collecting electrodes of the four NPN triodes are connected with.

Furthermore, the stabilized voltage power supply of the wireless receiving equipment is an AC-to-DC switching power supply module; the wireless receiving circuit comprises a wireless receiving circuit module and resistors, light emitting diodes, a buzzer and an NPN triode, wherein four high-level output ends and pulse output ends of the wireless receiving circuit module are respectively connected with one end of five resistors, the other end of the five resistors is connected with anodes of the four light emitting diodes and bases of the NPN triode, a collector of the NPN triode is connected with a negative power supply input end of the buzzer, an emitting electrode of the NPN triode is connected with cathodes of the four light emitting diodes and a negative power supply input end of the wireless receiving circuit module, and a positive power supply input end of the wireless receiving circuit module is connected with a positive power supply input end of the buzzer.

The utility model has the advantages that: the utility model discloses when taking place the methane leakage in the pit, radio signal can be launched after multichannel detection equipment detects, a plurality of borehole operation personnel bodyAfter the alarm equipment on receives the signal, the operator can be prompted through sound, light and vibration in time, so that the underground personnel can know the alarm condition as soon as possible and take corresponding self-rescue measures. After the alarm signal occurs, the relay equipment can relay and transmit the on-site wireless alarm signal to the wireless receiving equipment in the ground management room, the transmission distance of the wireless alarm signal is prolonged, and it is ensured that personnel in a monitoring department on the ground can receive the gas leakage alarm signal in time as far as possible, so that the personnel on the ground and the personnel in the ground are linked, rescue measures are taken as soon as possible, and secondary disasters caused by gas leakage are reduced. Based on the above, the novel device has good application prospect_。

Drawings

The present invention will be further explained with reference to the drawings and the embodiments_。

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a circuit diagram of the present invention, wherein the present invention is used for detecting devices of the same type_。

Fig. 3 is a circuit diagram of the alarm device of the present invention.

Fig. 4 is a circuit diagram of the relay device of the present invention.

Fig. 5 is a circuit diagram of the wireless receiving device of the present invention.

Detailed Description

As shown in fig. 1, the methane sensor for coal mine comprises four detection devices 1, a plurality of alarm devices 2, a relay device 3 and a wireless receiving device 4; the four detection devices are consistent in structure, each detection device comprises a stabilized voltage power supply 101, a detection circuit 102, a wireless transmitting circuit 103 and a probe 104, the stabilized voltage power supply 101, the detection circuit 102, the wireless transmitting circuit 103 and the probe 104 are arranged on a circuit board in an element box A105, and the element boxes A105 of the four detection devices are respectively arranged on four pit walls of an area where gas leakage easily occurs under a coal mine in a screw and nut mode; the plurality of paths of alarm equipment are consistent in structure, each path of alarm equipment comprises a storage battery 21, a charging socket 22, a power switch 23, a wireless receiving circuit 24, a buzzer 25 and an eccentric motor 26, the storage battery 21, the charging socket 22, the power switch 23, the wireless receiving circuit 24, the buzzer 25 and the eccentric motor 26 are arranged on a circuit board in an element box B27, and each underground worker carries one set of alarm equipment; the relay equipment comprises a stabilized voltage power supply 31, a wireless transmitting circuit 32 and a wireless receiving circuit 33, wherein the stabilized voltage power supply 31, the wireless transmitting circuit 32 and the wireless receiving circuit 33 are installed on a circuit board in an element box C34, and the element box C34 of the relay equipment is installed on a regional underground pit wall which is arranged in a coal mine and is spaced from a well mouth by a certain distance in a screw nut mode; the wireless receiving equipment comprises a stabilized voltage power supply 41 and a wireless receiving circuit 42, wherein the stabilized voltage power supply 41 and the wireless receiving circuit 42 are installed on a circuit board in an element box D43, and an element box D43 of the wireless receiving equipment is installed in a monitoring room which is not far away from a mine opening in a screw nut mode.

As shown in fig. 1 and 2, in the present invention, one of four paths of detection devices, one of a plurality of paths of alarm devices, combines with one path of relay device and wireless receiving device, and the working principle and process are completely the same, and all the following contents are representatively described by using one path of detection device, one path of alarm device, combines with one path of relay device and wireless receiving device. Each set of detection circuit of the four-path detection equipment comprises an operational amplifier A2 with the model NE5532, resistors R1 and R2, an adjustable resistor RP, a diode VD1, a PNP triode Q, a relay J and a buzzer B3, the circuit board is connected with the adjustable resistor RP, one end of the adjustable resistor RP is connected with the pin 3 of the non-inverting input end of the operational amplifier A2 and one end of the first resistor R1, the other end of the first resistor R1 is connected with the power input end of the negative pole of the relay J, the power input end of the negative pole of the buzzer B3 and the pin 4 of the power input end of the negative pole of the operational amplifier A2, the other end of the adjustable resistor RP is connected with a pin 8 of an anode power supply input end of the operational amplifier A2 and an emitting electrode of a PNP triode Q, a pin 1 of an output end of the operational amplifier A2 is connected with a negative electrode of a diode VD1, a positive electrode of the diode VD1 is connected with one end of a second resistor R2, the other end of the second resistor R2 is connected with a base electrode of the PNP triode Q, and a collecting electrode of the PNP triode Q is connected with a power supply input end of a positive electrode of a relay J and a buzzer B3. The stabilized voltage power supply A of each path of detection equipment is a finished product of a switching power supply module with the power of 100W and the model of S-60-6 for converting alternating current 220V into 6V; the wireless transmitting circuit A3 is a finished product of a wireless transmitting circuit module with model SF15000, the transmitting distance of wireless signals is 1500 meters, a coding circuit is arranged in the wireless transmitting circuit module, the wireless transmitting circuit module with the same model and without the same code can be prevented from transmitting the wireless signals to interfere with each other through coding of the coding circuit, the wireless transmitting circuit A3 is provided with four keys S1, S2, S3 and S4, and the wireless transmitting circuit A3 can transmit four paths of wireless signals with different instructions when being pressed respectively. The probe of each path of detection equipment comprises a combustible gas leakage probe body T with the model QM-N5, a resistor R and an adjustable resistor RP1 which are connected by a circuit board in a wiring way, and the front end of the detection surface of the probe body is positioned at the rear side of an opening in the middle of the front end of the element box A; the first measuring electrode 3 pin of the probe body T is connected with one end of a resistor R, the other end of the resistor R is connected with the positive power input end 1 pin of the probe body T, the second measuring electrode 4 pin of the probe body T is connected with the positive electrode of a diode VD, and the negative electrode of the diode VD is connected with one end of an adjustable resistor RP 1. In each path of detection equipment,

pins

1 and 2 of a power supply input end of a stabilized voltage supply A and two poles of an alternating current 220V power supply are respectively connected through leads,

pins

3 and 4 of a power supply output end of the stabilized voltage supply A, PNP triode Q emitting electrodes at two ends of a power supply input end of a detection circuit and a negative power supply input end of a relay J,

pins

1 and 2 of a power supply input end of a wireless transmitting circuit A3, the other end of a resistor R at two ends of the power supply input end of a probe body T and a pin 2 of a negative power supply input end of the probe body T are respectively connected through leads, and the other end of a signal output end adjustable resistor RP1 of the probe body and a pin 2 of a reverse input end; the detection circuit of the four-way detection device is characterized in that a control contact end and a normally open contact end of a four-way signal output end relay J of the detection circuit of the four-way detection device are respectively connected with two contacts under a transmission key S1, two contacts under a transmission key S2, two contacts under a transmission key S3 and two contacts under a transmission key S4 through leads.

As shown in FIGS. 1 and 3, the storage battery G of each alarm device is a 6V/3Ah lithium storage battery; the charging socket CZ is a coaxial power socket; the power switch S is a toggle power switch; the wireless receiving circuit comprises a wireless receiving circuit module finished product A9 of SF1500 type, a resistor R12, an NPN triode Q6 and a light emitting diode VL5 which are connected through circuit board wiring, a coding circuit is arranged in the wireless receiving circuit module A9, the wireless receiving circuit modules of the same type and without the same code can be prevented from receiving wireless signals to interfere with each other through coding of the coding circuit, the coding of the wireless receiving circuit module A9 is consistent with the coding of a wireless transmitting circuit A3 of four-way detection equipment, the wireless receiving circuit module A9 is provided with four

output ends

3, 4, 5 and 6 pins, a pulse output end 2 pin, when any one of the four output ends outputs a high-level signal, the pulse output end 2 pin of the pulse output end is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the anode of the light emitting diode VL5 (the light emitting surface is positioned outside a first opening hole in front of the, The base electrode of the NPN triode Q6 is connected, and the emitter electrode of the NPN triode Q6 is connected with the cathode of the light emitting diode VL5 and the pin 2 of the cathode power supply input end of the wireless receiving circuit module A9. In each alarm device, two poles of a storage battery G and two ends of a charging socket CZ (a jack is positioned outside a second opening in front of an element box B) are respectively connected through leads (the storage battery G is charged by being inserted into the charging socket CZ through a plug of an external 6V power charger), the positive pole of the storage battery G is connected with one end of a power switch S through leads, the other end of the power switch S, the negative pole of the storage battery G and two

ends

1 and 3 of the power input end of a wireless receiving circuit module A9 are respectively connected through leads, and the collector electrodes of an NPN triode Q6 at two ends of the output power of a wireless receiving circuit are respectively connected with a signal sounder B1 and two ends of the power input end of.

As shown in fig. 1 and 4, a voltage-stabilized power supply a4 of the relay device is a finished product of a switching power supply module of type S-60-6, converting alternating current 220V into direct current 6V, and has power of 100W; the wireless transmitting circuit A6 is a wireless transmitting circuit module finished product with the model SF 15000; the wireless receiving circuit comprises a finished wireless receiving circuit module A5 of a model SF1500, resistors R3, R4, R5 and R6, NPN triodes Q1, Q2, Q3 and Q4, relays J1, J2, J3 and J4 which are connected through circuit board wiring, the code of the finished wireless receiving circuit module A5 is consistent with that of a wireless transmitting circuit A3 of a four-way detection device, a pin of a positive power supply input end of the wireless receiving circuit module A5 is connected with positive power supply input ends of four relays J1, J2 and J2, four high-

level output ends

4, 5, 6 and 7 of the wireless receiving circuit module A2 are connected with four resistors R2, one ends of R2 and R2 respectively, four resistors R2, another end of the triode Q2, a base of the resistor J2, a base of the NPN 2, a collector of the NPN 2, a transistor J2, a collector of the NPN 2 and the NPN 2 are connected with the NPN 2 and the NPN 2, the emitter electrodes of the four NPN triodes Q1, Q2, Q3 and Q4 are connected with the pin 3 of the negative power supply input end of the wireless receiving circuit module A5. In the relay equipment,

pins

1 and 2 of a power input end of a regulated power supply A4 and two poles of an alternating current 220V power supply are respectively connected through leads,

pins

3 and 4 of a power output end of a regulated power supply A4,

pins

1 and 2 of a power input end of a wireless transmitting circuit A6, a positive power input end of a relay J1 at the power input end of a wireless receiving circuit and an emitting electrode of an NPN triode Q1 are respectively connected through leads, the wireless receiving circuit four-way signal output end relay J1 control contact end and normally open contact end, relay J2 control contact end and normally open contact end, relay J3 control contact end and normally open contact end, relay J4 control contact end and normally open contact end and wireless transmitting circuit A6 signal input end transmit key S1 key two contacts, transmit key S2 key two contacts, transmit key S3 key two contacts, transmit key S4 key two contacts are respectively connected through wires.

As shown in fig. 1 and 5, a regulated power supply a7 of the wireless receiving device is a finished product of a model S-60-6 alternating current 220V-to-6V direct current switching power supply module with power of 100W; the wireless receiving circuit comprises a wireless receiving circuit module finished product A of type SF1500, resistors R, light emitting diodes VL, a buzzer B and an NPN triode Q which are connected through circuit board wiring, the codes of the wireless receiving circuit module A are consistent with the codes of a wireless transmitting circuit A of relay equipment, four high-

level output ends

4, 5, 6 and 7 of the wireless receiving circuit module and a pulse output end 2 pin are respectively connected with one ends of five resistors R, R and R, the other ends of the five resistors R, NPN R and the other ends of the NPN resistors VL, VL and VL are connected with an triode Q base, an NPN triode Q collector is connected with a negative power supply input end of the sounder B, an NPN triode Q emitter is connected with four light emitting diodes VL, VL and VL (a light emitting surface is positioned outside four holes at the front end of the element box D), a negative pole, the 3-pin connection of the negative power input end of the wireless receiving circuit module A8 is realized, and the 1-pin connection of the positive power input end of the wireless receiving circuit module A8 is connected with the positive power input end of the annunciator B. In the wireless receiving equipment,

pins

1 and 2 of a power input end of a stabilized voltage power supply A7 and two poles of an alternating current 220V power supply are respectively connected through leads, and

pins

3 and 4 of a power output end of a stabilized voltage power supply A7 and two pins of a power input end of a wireless receiving circuit are respectively connected with a positive power input end of a buzzer B and an emitting electrode of an NPN triode Q5 through leads.

In the four-way detection device shown in fig. 1, 2, 3, 4 and 5, after the 220V ac power supply enters the

pins

1 and 2 of the regulated power supply a, the

pins

3 and 4 of the regulated power supply a will output stable 6V power supply to enter the detection circuit and the power input terminals of the probe and the wireless transmission circuit, so that the circuits are in the power-on working state. In the relay device, after the 220V alternating current power supply enters the

pins

1 and 2 of the stabilized voltage supply A4, the

pins

3 and 4 of the stabilized voltage supply A4 can output stable 6V power supply to enter the power input ends of the wireless transmitting circuit and the wireless receiving circuit, and then the circuits are in a power-on working state. In the wireless receiving device, after the 220V alternating current power supply enters the

pins

1 and 2 of the regulated power supply A7, the

pins

3 and 4 of the regulated power supply A7 can output stable 6V power supply to enter the two ends of the power supply input of the wireless receiving circuit, and then the wireless receiving circuit is in a power-on working state. In the plurality of paths of alarm equipment, after the power switch is turned on, the wireless receiving circuit is in a power-on working state.

In the four-path detection device shown in fig. 1 and 2, after a 6V power supply output by a voltage-stabilized power supply enters

pins

1 and 2 of an air-sensitive device T (a resistor R1 reduces voltage and limits current), a heating wire inside the air-sensitive device T is powered on to work; when methane gas leakage does not occur on site and air is fresh, internal resistance between a first measuring electrode pin 3 and a second measuring electrode pin 4 of the gas sensitive device T is large, voltage of the second measuring electrode pin 4 is low, and voltage of a pin 2 of the power supply entering the operational amplifier A2 is low after the power supply is subjected to unidirectional conduction through a diode VD and voltage reduction and current limitation through an adjustable resistor RP 1. When methane gas leakage occurs on site, after the gas sensitive device T detects the methane gas leakage, the internal resistance between the pin 3 of the first measuring electrode and the pin 4 of the second measuring electrode is reduced, the output voltage of the pin 4 of the second measuring electrode is increased, and the voltage of the pin 2 of the power supply entering the operational amplifier A2 is increased after the voltage is reduced and limited by the adjustable resistor RP. In the four-path detection device, the potential of the pin A3 of the non-inverting input end of the operational amplifier A2 is obtained by dividing the voltage by an adjustable resistor RP and a resistor R1 and is set to be slightly higher than 0.7V, when no methane leakage occurs on site, the voltage of the pin 2 of the inverting input end of the operational amplifier A2 is lower than the voltage of the pin 3 of the non-inverting input end, so under the action of an internal circuit of the operational amplifier A2, the pin 1 of the output end of the operational amplifier A2 outputs a high level to enter the cathode of a diode VD1, and due to the reverse blocking action of the diode VD1, the base electrode of a PNP triode Q has no low level input and is in a blocking state, a subsequent sounder B cannot sound, and a wireless transmitting. When methane leakage occurs on site, the voltage of the 2-pin of the inverting input end of the operational amplifier A2 is higher than the voltage of the 3-pin of the non-inverting input end, under the action of an internal circuit of the operational amplifier A2, the 1-pin of the output end of the operational amplifier A2 stops outputting high level, the 1-pin of the output end of the operational amplifier A2 outputs low level, the low level enters the cathode of a diode VD1, the low level enters the base of a PNP triode Q through one-way conduction of the diode VD and through voltage reduction and current limitation of a resistor R2, then the PNP triode Q conducts the collector of the PNP triode Q to output high level, the high level enters the positive power input ends of a relay J and a signal sounder B3, the relay J is electrified to attract the control power input end and a normally open contact end to be closed. Because, the detection circuit four-way signal output end relay J control contact end and the normally open contact end of four ways of detection equipment and the wireless transmitting circuit A3 signal input end transmission button S1 key two contacts, the transmission button S2 key two contacts, the transmission button S3 key two contacts, the transmission button S4 key two contacts respectively through the wire connection, so, when specifically using, when there are four monitoring areas corresponding respectively take place methane leakage, wireless transmitting circuit A3 can send out four different wireless closed signals respectively.

As shown in fig. 1 and 3, in the plurality of alarm devices, when methane leaks in the field, any one wireless transmitting circuit A3 transmits a wireless signal, and after receiving a wireless closing signal, the wireless receiving circuit module a9 outputs a pulse power signal (when the wireless transmitting circuit A3 does not stop outputting the wireless signal, the pulse signal is always output)) through the resistor R12, the current is reduced and limited, and the current enters the base of the NPN triode Q6 and the anode of the light emitting diode VL5 (higher than 0.7V), so that the light emitting diode VL5 is powered on to emit light. After the NPN triode Q6 is conducted, the collector of the NPN triode Q6 outputs low level to enter the negative power supply input end of the buzzer B and the vibrating eccentric motor M, and then the buzzer B and the vibrating eccentric motor M are electrified to work. Therefore, after methane leakage occurs on site, the alarm device carried by each underground operator can give out sound, light and vibration prompts to warn the site personnel of methane leakage and timely dispose or escape.

In the relay device shown in fig. 1 and 4, when methane leaks underground, the wireless transmitting circuit A3 transmits one or more different wireless signals, and the wireless receiving circuit a5 receives the wireless close signal. When the wireless transmitting circuit A3 respectively transmits four paths of wireless signals,

pins

4, 5, 6 and 7 of the wireless receiving circuit A5 respectively output high levels, the high levels are subjected to current limiting through resistors R3, R4, R5 and R6 and then respectively enter bases of NPN triodes Q1, Q2, Q3 and Q4, then the NPN triodes Q1, Q2, Q3 and Q4 respectively conduct collectors and respectively output low levels to enter negative power input ends of relays J1, J2, J3 and J4, and relays J1, J2, J3 and J4 are respectively electrified to attract a control contact end and a normally open contact end of the relays to be respectively closed. Because, the control contact end and the normally open contact end of wireless receiving circuit four ways signal output end relay J1, relay J2 control contact end and normally open contact end, relay J3 control contact end and normally open contact end, relay J4 control contact end and normally open contact end and wireless transmitting circuit A6 signal input part transmission button S1 key two contacts down, transmission button S2 key two contacts down, transmission button S3 key two contacts down, transmission button S4 key two contacts down are respectively through the wire connection, so after the methane leakage takes place in different positions in the pit, wireless transmitting circuit A6 can launch four ways different wireless closed signals respectively. Because the relay equipment is positioned near the underground wellhead and between the four sets of detection equipment and the wireless receiving equipment, the relay function is realized, the transmitting distance of the underground wireless alarm signal is prolonged by one time, and the wireless alarm signal can be transmitted to the ground wireless receiving equipment after the underground methane leakage occurs.

As shown in fig. 1 and 5, in the wireless receiving device, when methane leaks from different positions in the well, the wireless transmitting circuit a6 of the relay device transmits one or more different wireless closed signals, and after the wireless receiving circuit A8 receives the signals, its 4, 5, 6, and 7 pins will output high levels respectively, and after current limitation is performed through resistors R7, R8, R9, and R10, the signals respectively enter the positive power input terminals of four light emitting diodes VL1, VL2, VL3, and VL4, so that one or more of the four light emitting diodes VL1, VL2, VL3, and VL4 are powered to give clear indications to the monitoring room, specifically, which position methane leaks (each light emitting diode represents a leaking methane position in one azimuth). When the wireless receiving circuit A8 receives the wireless signal, the 2 feet of the wireless receiving circuit A8 can output a pulse power supply signal (when the wireless transmitting circuit A6 does not stop outputting the wireless signal, the pulse signal can be output all the time), the pulse power supply signal is reduced in voltage and limited in current through the resistor R11, the pulse power supply signal enters the base electrode of the NPN triode Q5, then the collector electrode of the NPN triode Q5 outputs low level after being conducted, the low level power supply signal enters the negative power supply input end of the buzzer B, and the X buzzer B. Therefore, after methane leakage occurs on site, monitoring department personnel on the ground can receive the gas leakage alarm signal in time, so that the personnel on the well and the personnel in the well are linked, rescue measures are taken as soon as possible, and the occurrence of disasters caused by gas leakage is reduced.

In fig. 1, the diodes VD, VD1 are model numbers 1N 4007; the resistances of the resistors R, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12 are respectively 80 Ω, 10K, 1K and 600 Ω; the specifications of the adjustable resistors RP and RP1 are 47K and 4.7K respectively; model numbers of NPN triodes Q1, Q2, Q3, Q4, Q5 and Q6 are 9013; relays J, J1, J2, J3, J4 are DC4100 type 6V relays; the beepers B, B1 and B3 are active continuous sound high decibel alarm finished products of model BJ-1; the light emitting diodes VL1, VL2, VL3, VL4, VL5 are red light emitting diodes; the eccentric motor M consists of a small motor with the working voltage of 6V and the power of 2W and an eccentric wheel, and the eccentric wheel is arranged on a rotating shaft of the motor; the model of the PNP triode Q is 9012.

Having shown and described the basic principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. The methane sensor for the coal mine is characterized by comprising a multi-path detection device, a multi-path alarm device, a relay device and a wireless receiving device; the multi-path detection equipment has the same structure, each path of equipment comprises a voltage-stabilized power supply, a detection circuit, a wireless transmitting circuit and a probe, and the voltage-stabilized power supply, the detection circuit, the wireless transmitting circuit and the probe are arranged in the element box A; the detection circuit of the multi-path detection equipment comprises an operational amplifier, a resistor, an adjustable resistor, a diode, a PNP triode, a relay and a buzzer, and the detection circuit is connected with the relay through circuit board wiring; in each path of detection equipment, the signal output end of the probe is electrically connected with the signal input end of the detection circuit; the multi-path signal output end of the detection circuit of the multi-path detection equipment is electrically connected with the signal input end of the wireless transmitting circuit of the multi-path detection equipment respectively; the multi-channel alarm equipment has consistent structures, each channel comprises a storage battery, a charging socket, a power switch, a wireless receiving circuit, a buzzer and an eccentric motor, and the storage battery, the charging socket, the power switch, the wireless receiving circuit, the buzzer and the eccentric motor are arranged in an element box B; in each path of alarm equipment, two ends of an output power supply of a wireless receiving circuit are respectively and electrically connected with two ends of a signal sounder and a power supply input of an eccentric motor; the relay equipment comprises a voltage-stabilized power supply, a wireless transmitting circuit and a wireless receiving circuit, wherein the voltage-stabilized power supply, the wireless transmitting circuit and the wireless receiving circuit are arranged in the element box C; in the relay equipment, a multi-path signal output end of a wireless receiving circuit is electrically connected with a multi-path signal input end of a wireless transmitting circuit respectively; the wireless receiving equipment comprises a voltage-stabilized power supply and a wireless receiving circuit, wherein the voltage-stabilized power supply and the wireless receiving circuit are arranged in the element box D.

2. The coal mine methane sensor according to claim 1, wherein the regulated power supply of each detection device is an AC-to-DC switching power supply module; the wireless transmitting circuit is a wireless transmitting circuit module.

3. The coal mine methane sensor according to claim 1, wherein the probe of each detection device comprises a probe body of type QM-N5, a resistor and an adjustable resistor, which are connected by a circuit board, a first measuring electrode of the probe body is connected with one end of the resistor, the other end of the resistor is connected with a positive power supply input end of the probe body, a second measuring electrode of the probe body is connected with a positive electrode of a diode, and a negative electrode of the diode is connected with one end of the adjustable resistor.

4. The coal mine methane sensor according to claim 1, wherein the wireless receiving circuit of each alarm device comprises a wireless receiving circuit module, a resistor, an NPN triode and a light emitting diode, which are connected through a circuit board, a pulse output end of the wireless receiving circuit module is connected with one end of the resistor, the other end of the resistor is connected with a positive electrode of the light emitting diode and a base electrode of the NPN triode, and an emitting electrode of the NPN triode is connected with a negative electrode of the light emitting diode and a negative power supply input end of the wireless receiving circuit module.

5. The coal mine methane sensor according to claim 1, wherein the stabilized voltage power supply of the relay device is an AC-to-DC switching power supply module; the wireless transmitting circuit is a wireless transmitting circuit module; the wireless receiving circuit comprises a wireless receiving circuit module, resistors, NPN triodes and relays, wherein the wireless receiving circuit module and the resistors, the NPN triodes and the relays are connected through circuit board wiring, a positive power supply input end of the wireless receiving circuit module is connected with positive power supply input ends of the four relays, four high-level output ends of the wireless receiving circuit module are respectively connected with one ends of the four resistors, the other ends of the four resistors are connected with bases of the four NPN triodes, emitting electrodes of the four NPN triodes are respectively and electrically connected with negative power supply input ends of the four relays, and collecting electrodes of the four NPN triodes are connected with.

6. The coal mine methane sensor according to claim 1, wherein the regulated power supply of the wireless receiving device is an AC-to-DC switching power supply module; the wireless receiving circuit comprises a wireless receiving circuit module and resistors, light emitting diodes, a buzzer and an NPN triode, wherein four high-level output ends and pulse output ends of the wireless receiving circuit module are respectively connected with one end of five resistors, the other end of the five resistors is connected with anodes of the four light emitting diodes and bases of the NPN triode, a collector of the NPN triode is connected with a negative power supply input end of the buzzer, an emitting electrode of the NPN triode is connected with cathodes of the four light emitting diodes and a negative power supply input end of the wireless receiving circuit module, and a positive power supply input end of the wireless receiving circuit module is connected with a positive power supply input end of the buzzer.