CN212060109U - Low-concentration methane sensor for coal mine - Google Patents
Low-concentration methane sensor for coal mine Download PDFInfo
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- CN212060109U CN212060109U CN201922353404.XU CN201922353404U CN212060109U CN 212060109 U CN212060109 U CN 212060109U CN 201922353404 U CN201922353404 U CN 201922353404U CN 212060109 U CN212060109 U CN 212060109U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 239000003245 coal Substances 0.000 title claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000001174 ascending effect Effects 0.000 description 10
- 239000000523 sample Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model discloses a low-concentration methane sensor for coal mine, which comprises a sensor host and an infrared remote control board communicated with the sensor host; the sensor host comprises a square shell and a surface cover which is arranged on the front side of the shell and is sealed with the shell through a sealing ring; a control panel is arranged on the inner side of the shell; a hanging hook is arranged at the top of the shell; a four-core joint and a sensor mounting tube seat are fixed at the bottom of the shell; light alarm covers are arranged on two sides of the upper part of the face cover; a raised annular window is integrally formed in the middle of the face cover; a transparent plate is fixedly attached to the annular window on the inner surface of the face cover; the utility model discloses a low concentration methane sensor for colliery adopts infrared outside to adjust, and whole machine adopts totally enclosed structure, and the sensor does not have the part that the regulation hole and needs adjusted, and sealing performance is good, and job stabilization is reliable, and can cooperate the methane outage appearance to accomplish the environment allies oneself with the accuse.
Description
Technical Field
The utility model relates to a methane sensor, concretely relates to low concentration methane sensor for coal mine belongs to coal mine gas monitoring devices technical field.
Background
The methane sensor is applied to a coal mine safety detection system, is used for continuously monitoring the methane concentration in a coal mine roadway, a mining working face, a goaf, an air return roadway, an electromechanical chamber and the like, can automatically give out sound and light alarm when the methane concentration exceeds the limit, can be carried about by coal mine underground operators, methane detection personnel, underground management personnel and the like, and can also be fixedly used in the places; the existing methane sensor has poor sealing performance, can only carry out monitoring and alarming, and cannot carry out joint control.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a low concentration methane sensor for coal mine adopts infrared external adjustment, and whole machine adopts totally enclosed structure, and the sensor does not have the part that the regulation hole and needs adjusted, and sealing performance is good, and job stabilization is reliable, and can cooperate the methane outage appearance to accomplish the environment allies oneself with the accuse.
The low-concentration methane sensor for the coal mine adopts the thermal catalysis principle probe to monitor the low-concentration methane gas, and is suitable for measuring the methane concentration in the coal mine in the places with gas explosion danger; the sensor has the functions of semi-automatic zero setting, full degree setting, alarm point setting and power-off point setting, all functions can be set through infrared remote control, and the sensor has the functions of ultralimit acousto-optic alarm and ultralimit power-off signal output; the sensor has no adjusting hole and part needing to be adjusted, the sealing performance is good, and the work is stable and reliable; the sensor has various signal output forms and can be compatible with other coal mine monitoring systems; the fire detector can also be independently used for various mine fire detection systems; the control panel mainly comprises a power supply circuit, a methane gas-sensitive sensing element, a bridge circuit, an amplifying circuit, an A/D converter, an infrared receiver, a single-chip microcomputer minimum system, a three-position nixie tube circuit, an output control circuit and an alarm/power-off circuit; the power supply circuit stabilizes the direct current 9-18V power supply sent by the associated equipment into 5V voltage and supplies the voltage to the circuit of the whole machine for use; the methane gas-sensitive sensing element adopts a thermal catalysis principle probe (a black and white element), and the working principle is as follows: the black-and-white element is composed of a measuring element (black element) and a compensating element (white element), and the surface of the measuring element is coated with black catalyst; when the device works, the black-white element generates heat when working current flows through the black-white element, methane in the air generates flameless combustion under the action of a catalyst of the high-temperature measuring element, the higher the methane concentration is, the higher the temperature of the measuring element is, the larger the resistance value is, the temperature of the compensating element is unchanged, and the measuring bridge outputs a signal voltage which is in direct proportion to the methane concentration; the signal voltage output by the measuring bridge is amplified by an amplifying circuit and then sent to an A/D converter for conversion, the signal voltage is converted into a digital signal and sent to a single chip microcomputer for processing, a concentration value of methane is displayed by a display circuit, and a frequency signal corresponding to the concentration value of methane is output by an output control circuit; the alarm/power-off circuit consists of a light-emitting diode, a buzzer and a control driving circuit, when the concentration of methane exceeds a set alarm point, the sensor can send out sound and light alarm signals, and when the concentration of methane exceeds the set power-off point, the sensor outputs a power-off signal; after the methane concentration exceeds the power-off point, the sensor releases the power-off signal output only when the methane concentration is reduced to be below a set power-on point; the concrete structure is as follows: the system comprises a sensor host and an infrared remote control board communicated with the sensor host; the sensor host comprises a square shell and a face cover arranged on the front side of the shell; a control panel is arranged on the inner side of the shell; a hanging hook is arranged at the top of the shell; a four-core joint and a sensor mounting tube seat are fixed at the bottom of the shell; light alarm covers are arranged on two sides of the upper part of the face cover; a raised annular window is integrally formed in the middle of the face cover; a transparent plate is fixedly attached to the annular window on the inner surface of the face cover; the lower part of the annular window of the face cover is pressed with an annular convex part; a plurality of sound through holes are formed in the annular convex part; a nameplate position is arranged at the bottom of the annular outer convex part of the face cover; an LED is fixedly attached to the inner surface of the light alarm cover; a three-position LED nixie tube is fixedly attached to the inner surface of the transparent plate; a buzzer is fixedly attached to the inner surface of the annular outer convex part; a methane gas-sensitive sensing element is arranged on the inner side of the sensor mounting tube seat; the LED, the three-position LED nixie tube, the buzzer and the methane gas-sensitive sensing element are electrically connected to the control panel.
Furthermore, the four-core plug is a power input interface and a signal output interface, and the four cores of the four-core plug are respectively a power supply plus pin, a signal output plus pin and a null pin.
Further, the control board includes a bridge circuit; the bridge arm of the bridge circuit is connected in series with the methane gas-sensitive sensing element; the bridge circuit output is electrically connected to a voltage amplifier, which is electrically connected to an AD converter; the AD converter is electrically connected to the minimum system of the single chip microcomputer; the minimum system of the single chip microcomputer is electrically connected with the LED, the three-position LED nixie tube and the buzzer through the LED driving circuit, the LED nixie tube driving circuit and the buzzer driving circuit respectively; the four-core joint is respectively and electrically connected to a power supply end of the control panel and the output control circuit; the single chip microcomputer minimum system is also electrically connected with an infrared receiver which is communicated with an infrared remote control board and is used for completing methane concentration detection, follow-up sound-light alarm driving and external output.
Furthermore, the infrared remote control board comprises a remote control board body, an infrared emission circuit arranged on the inner side of the remote control board body, and a switch key, an ascending key, a descending key, a conversion key and a setting key which are arranged on the remote control board body and are respectively and electrically connected with the infrared emission circuit; after the sensor is started stably, the infrared remote control board presses a switch key to the light alarm cover on the right side of the sensor, the sensor enters a zero setting state, and the decimal point of the single digit of the sensor nixie tube is displayed and flickers; the sensor is placed in fresh air or pure standard air is introduced into a sensor probe, the flow rate is 200mL/min, after the reading is stable, the sensor is in a zero setting state, a descending key of a remote controller is pressed, and the sensor automatically returns to zero; after the sensor enters a zero setting state, if the zero setting operation is cancelled, the on-off key of the remote controller is pressed; then, the fullness is adjusted; after the sensor enters the zero setting state, a conversion key of the remote controller is pressed, the sensor enters the full setting state from the zero setting state, the decimal point of the hundreds digit of the sensor flickers at the moment, and the decimal point of the single digit is not displayed; introducing 1.00-4.00% of methane standard gas into a sensor probe, wherein the flow rate is 200mL/min, and after the reading is stable, enabling the display value of the sensor to be consistent with the concentration of the used standard gas through a descending key and an ascending key of a remote controller; nullifying of fullness(too low a methane concentration of 0.5% or less CH)4Or exceeds the full adjustment range of the sensor by more than or equal to 4.00 percent CH4Or preheating time is less than or equal to 15 minutes), the sensor sends out acousto-optic prompt signals; after the fullness is set, pressing a switch key of the remote controller, and enabling the sensor to exit a remote control state; setting an alarm point, pressing a conversion key of the remote controller twice after the sensor enters a zero setting state, enabling the sensor to enter the alarm point setting state, displaying 'b' on the nixie tube hundred digits of the sensor at the moment, and setting the alarm point by pressing an ascending key and a descending key of the remote controller; after the alarm point is set, pressing the on-off key of the remote controller, and the sensor quits the remote control state; setting a power-off point, pressing a conversion key of the remote controller for three times after the sensor enters a zero setting state, and enabling the sensor to enter a power-off point setting state, wherein the hundred digits of the nixie tube of the sensor display'd'; the power-off point can be set by pressing the ascending key and the descending key of the remote controller; after the power-off point is set, pressing a switch key of the remote controller, and enabling the sensor to exit a remote control state; setting a power restoration point, pressing a conversion key of a four-key remote controller after a sensor enters a zero setting state, enabling the sensor to enter the power restoration point setting state, displaying 'F' on the hundred digits of a nixie tube of the sensor at the moment, and setting the power restoration point by pressing an ascending key and a descending key of the remote controller; after the reset point is set, the switch key of the remote controller is pressed, and the sensor exits the remote control state.
Furthermore, the four-core connector is respectively and electrically connected with a power supply and a control signal end of the methane power-off instrument through a plug cable.
In a preferred embodiment, a dustproof film is arranged inside the annular convex part.
Compared with the prior art, the utility model discloses a low concentration methane sensor for colliery adopts infrared outside to adjust, and whole machine adopts totally enclosed structure, and the sensor does not have the part that the regulation hole and needs adjusted, and sealing performance is good, and job stabilization is reliable, and can cooperate the methane outage appearance to accomplish the environment allies oneself with the accuse.
Drawings
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the structure of the control panel of the present invention.
Fig. 3 is a schematic diagram of a methane gas sensor according to the present invention, and its acquisition and amplification circuit.
Detailed Description
Example 1:
as shown in fig. 1 and 2, the low-concentration methane sensor for coal mines of the present invention uses a thermal catalysis principle probe to monitor low-concentration methane gas, and is suitable for measuring methane concentration in places with gas explosion danger in coal mines; the sensor has the functions of semi-automatic zero setting, full degree setting, alarm point setting and power-off point setting, all functions can be set through infrared remote control, and the sensor has the functions of ultralimit acousto-optic alarm and ultralimit power-off signal output; the sensor has no adjusting hole and part needing to be adjusted, the sealing performance is good, and the work is stable and reliable; the sensor has various signal output forms and can be compatible with other coal mine monitoring systems; the fire detector can also be independently used for various mine fire detection systems; the control panel mainly comprises a power supply circuit, a methane gas-sensitive sensing element, a bridge circuit, an amplifying circuit, an A/D converter, an infrared receiver, a single-chip microcomputer minimum system, a three-position nixie tube circuit, an output control circuit and an alarm/power-off circuit; the power supply circuit stabilizes the direct current 9-18V power supply sent by the associated equipment into 5V voltage and supplies the voltage to the circuit of the whole machine for use; the methane gas-sensitive sensing element adopts a thermal catalysis principle probe (a black and white element), and the working principle is as follows: the black-and-white element is composed of a measuring element (black element) and a compensating element (white element), and the surface of the measuring element is coated with black catalyst; when the device works, the black-white element generates heat when working current flows through the black-white element, methane in the air generates flameless combustion under the action of a catalyst of the high-temperature measuring element, the higher the methane concentration is, the higher the temperature of the measuring element is, the larger the resistance value is, the temperature of the compensating element is unchanged, and the measuring bridge outputs a signal voltage which is in direct proportion to the methane concentration; the signal voltage output by the measuring bridge is amplified by an amplifying circuit and then sent to an A/D converter for conversion, the signal voltage is converted into a digital signal and sent to a single chip microcomputer for processing, a concentration value of methane is displayed by a display circuit, and a frequency signal corresponding to the concentration value of methane is output by an output control circuit; the alarm/power-off circuit consists of a light-emitting diode, a buzzer and a control driving circuit, when the concentration of methane exceeds a set alarm point, the sensor can send out sound and light alarm signals, and when the concentration of methane exceeds the set power-off point, the sensor outputs a power-off signal; after the methane concentration exceeds the power-off point, the sensor releases the power-off signal output only when the methane concentration is reduced to be below a set power-on point; the concrete structure is as follows: the system comprises a sensor host and an infrared remote control board communicated with the sensor host; the sensor host comprises a square shell 1 and a face cover 2 arranged on the front side of the shell; a control panel is arranged on the inner side of the shell 1; the top of the shell 1 is provided with a hanging hook 3; a four-core joint 4 and a sensor mounting tube seat 5 are fixed at the bottom of the shell 1; two sides of the upper part of the face cover 2 are provided with an optical alarm cover 6; a raised annular window 7 is integrally formed in the middle of the face cover 2; a transparent plate 8 is fixedly attached to the annular window on the inner surface of the face cover 2; the lower part of the annular window of the face cover 2 is pressed with an annular outer convex part 9; a plurality of sound through holes 10 are formed in the annular convex part 9; a nameplate position 11 is arranged at the bottom of the annular outer convex part of the surface cover 2; an LED12 is fixedly attached to the inner surface of the light alarm cover 6; a three-position LED nixie tube 13 is fixedly attached to the inner surface of the transparent plate 8; a buzzer 14 is fixedly attached to the inner surface of the annular outer convex part 9; a methane gas-sensitive sensing element 15 is arranged on the inner side of the sensor mounting tube seat 5; the LED12, the three-position LED nixie tube 13, the buzzer 14 and the methane gas-sensitive sensing element 15 are electrically connected to the control board.
The four-core plug 4 is a power input interface and a signal output interface, and the four cores are a power supply plus pin, a signal output plus pin and a null pin respectively.
As shown in fig. 2, the control board includes a bridge circuit 16; the bridge arm of the bridge circuit 16 is connected in series with the methane gas-sensitive sensing element 15; the output end of the bridge circuit 16 is electrically connected to a voltage amplifier 17, and the voltage amplifier 17 is electrically connected to an AD converter 18; the AD converter 18 is electrically connected to a singlechip minimum system 19; the single chip microcomputer minimum system 19 is electrically connected with the LED12, the three-position LED nixie tube 13 and the buzzer 14 through the LED drive circuit 20, the LED nixie tube drive circuit 21 and the buzzer drive circuit 22 respectively; the four-core joint 4 is respectively and electrically connected to a power supply end of a control panel and an output control circuit 23; the single-chip microcomputer minimum system 19 is also electrically connected with an infrared receiver 24 which is communicated with an infrared remote control board and is used for completing methane concentration detection, subsequent sound-light alarm driving and external output; as shown in fig. 3, the black-and-white element generates a weak signal proportional to the content of methane by the measuring element, generates an output signal after being amplified by the multi-stage amplifying circuit, and converts the amplified analog signal into a digital signal through an external a/D converter or an a/D conversion input port of the single chip; then the single chip computer processes the signal and realizes the functions of displaying, alarming and the like.
The infrared remote control board comprises a remote control board body 25, an infrared emission circuit arranged on the inner side of the remote control board body, and a switch key 26, an ascending key 27, a descending key 28, a conversion key 39 and a setting key 30 which are arranged on the remote control board body and are respectively and electrically connected with the infrared emission circuit; after the sensor is started stably, the infrared remote control board presses a switch key to the light alarm cover on the right side of the sensor, the sensor enters a zero setting state, and the decimal point of the single digit of the sensor nixie tube is displayed and flickers; the sensor is placed in fresh air or pure standard air is introduced into a sensor probe, the flow rate is 200mL/min, after the reading is stable, the sensor is in a zero setting state, a descending key of a remote controller is pressed, and the sensor automatically returns to zero; after the sensor enters a zero setting state, if the zero setting operation is cancelled, the on-off key of the remote controller is pressed; then, the fullness is adjusted; after the sensor enters the zero setting state, a conversion key of the remote controller is pressed, the sensor enters the full setting state from the zero setting state, the decimal point of the hundreds digit of the sensor flickers at the moment, and the decimal point of the single digit is not displayed; introducing 1.00-4.00% of methane standard gas into a sensor probe, wherein the flow rate is 200mL/min, and after the reading is stable, enabling the display value of the sensor to be consistent with the concentration of the used standard gas through a descending key and an ascending key of a remote controller; the fullness regulation is ineffective (the methane concentration is too low and less than or equal to 0.5 percent CH)4Or exceeds the full adjustment range of the sensor by more than or equal to 4.00 percent CH4Or preheating time less than or equal to 15 minutes), transferringThe sensor sends out acousto-optic prompt signals; after the fullness is set, pressing a switch key of the remote controller, and enabling the sensor to exit a remote control state; setting an alarm point, pressing a conversion key of the remote controller twice after the sensor enters a zero setting state, enabling the sensor to enter the alarm point setting state, displaying 'b' on the nixie tube hundred digits of the sensor at the moment, and setting the alarm point by pressing an ascending key and a descending key of the remote controller; after the alarm point is set, pressing the on-off key of the remote controller, and the sensor quits the remote control state; setting a power-off point, pressing a conversion key of the remote controller for three times after the sensor enters a zero setting state, and enabling the sensor to enter a power-off point setting state, wherein the hundred digits of the nixie tube of the sensor display'd'; the power-off point can be set by pressing the ascending key and the descending key of the remote controller; after the power-off point is set, pressing a switch key of the remote controller, and enabling the sensor to exit a remote control state; setting a power restoration point, pressing a conversion key of a four-key remote controller after a sensor enters a zero setting state, enabling the sensor to enter the power restoration point setting state, displaying 'F' on the hundred digits of a nixie tube of the sensor at the moment, and setting the power restoration point by pressing an ascending key and a descending key of the remote controller; after the reset point is set, the switch key of the remote controller is pressed, and the sensor exits the remote control state.
In another embodiment, the four-core connector 4 is electrically connected to a power supply and a control signal terminal of the methane power-off instrument through a plug cable.
Wherein, the inner side of the annular outer convex part 9 is provided with a dustproof film.
The above-mentioned embodiment is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles of the present invention are included in the claims of the present invention.
Claims (6)
1. A low concentration methane sensor for coal mine is characterized in that: the system comprises a sensor host and an infrared remote control board communicated with the sensor host; the sensor host comprises a square shell and a surface cover which is arranged on the front side of the shell and is sealed with the shell through a sealing ring; a control panel is arranged on the inner side of the shell; a hanging hook is arranged at the top of the shell; a four-core joint and a sensor mounting tube seat are fixed at the bottom of the shell; light alarm covers are arranged on two sides of the upper part of the face cover; a raised annular window is integrally formed in the middle of the face cover; a transparent plate is fixedly attached to the annular window on the inner surface of the face cover; the lower part of the annular window of the face cover is pressed with an annular convex part; a plurality of sound through holes are formed in the annular convex part; a nameplate position is arranged at the bottom of the annular outer convex part of the face cover; an LED is fixedly attached to the inner surface of the light alarm cover; a three-position LED nixie tube is fixedly attached to the inner surface of the transparent plate; a buzzer is fixedly attached to the inner surface of the annular outer convex part; a methane gas-sensitive sensing element is arranged on the inner side of the sensor mounting tube seat; the LED, the three-position LED nixie tube, the buzzer and the methane gas-sensitive sensing element are electrically connected to the control panel.
2. The low-concentration methane sensor for coal mines according to claim 1, wherein: the four-core plug is a power input interface and a signal output interface, and the four cores of the four-core plug are respectively a power supply plus pin, a signal output plus pin and a null pin.
3. The low-concentration methane sensor for coal mines according to claim 1, wherein: the control board comprises a bridge circuit; the bridge arm of the bridge circuit is connected in series with the methane gas-sensitive sensing element; the bridge circuit output is electrically connected to a voltage amplifier, which is electrically connected to an AD converter; the AD converter is electrically connected to the minimum system of the single chip microcomputer; the minimum system of the single chip microcomputer is electrically connected with the LED, the three-position LED nixie tube and the buzzer through the LED driving circuit, the LED nixie tube driving circuit and the buzzer driving circuit respectively; the four-core joint is respectively and electrically connected to a power supply end of the control panel and the output control circuit; the single chip microcomputer minimum system is also electrically connected with an infrared receiver communicated with an infrared remote control board.
4. The low-concentration methane sensor for coal mines according to claim 1, wherein: the infrared remote control board comprises a remote control board body, an infrared transmitting circuit arranged on the inner side of the remote control board body, and an on-off key, a rising key, a falling key, a conversion key and a setting key which are arranged on the remote control board body and are respectively and electrically connected with the infrared transmitting circuit.
5. The low-concentration methane sensor for coal mines according to claim 1, wherein: the four-core connector is electrically connected with a power supply and an input signal end of the methane power-off instrument through a plug cable respectively.
6. The low-concentration methane sensor for coal mines according to claim 1, wherein: and a dustproof film is arranged on the inner side of the annular outer convex part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922353404.XU CN212060109U (en) | 2019-12-25 | 2019-12-25 | Low-concentration methane sensor for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922353404.XU CN212060109U (en) | 2019-12-25 | 2019-12-25 | Low-concentration methane sensor for coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212060109U true CN212060109U (en) | 2020-12-01 |
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ID=73512526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922353404.XU Expired - Fee Related CN212060109U (en) | 2019-12-25 | 2019-12-25 | Low-concentration methane sensor for coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212060109U (en) |
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2019
- 2019-12-25 CN CN201922353404.XU patent/CN212060109U/en not_active Expired - Fee Related
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Granted publication date: 20201201 |