CN207231678U

CN207231678U - A kind of high accuracy coal mine gas outburst prediction instrument

Info

Publication number: CN207231678U
Application number: CN201720943388.8U
Authority: CN
Inventors: 张法全; 毕俊强; 肖海林; 王国富; 叶金才; 贾小波; 韦秦明
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2018-04-13
Anticipated expiration: 2027-07-31

Abstract

The utility model discloses a kind of high-precision coal mine gas outburst prediction instrument, including main control module, gas pressure sensor module, AD data conversion modules, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH memory modules, sram memory module and USB data interface, voice module is further included；The main control module is connected with AD data revolving dies block, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH memory modules, sram memory module, USB data interface and voice module respectively；AD data converters are also connected with gas pressure sensor.The prediction instrument acquisition speed is fast, high certainty of measurement, and stability and man-machine interaction are good, and low-power consumption is easy to operate.

Description

A kind of high accuracy coal mine gas outburst prediction instrument

Technical field

Coal mine gas outburst prediction instrument is the utility model is related to, is specifically a kind of high-precision coal mine gas outburst prediction instrument.

Background technology

Coal is the important basic energy resource and material in China, and huge contribution is made that for national economy.In the past 10 years, watt This accident accounts for colliery severe and great casualty nearly sixty percent.13 gas accidents, dead 142 people just occur for the whole nation within only 1 year 2016.Watt This accident is one of major casualty for threatening China's coal-mine safety.It can be seen that precisely prediction has weight to gas in safe coal production The meaning wanted.But the Instrument measuring precision of common measurement Gas Outburst is low both at home and abroad at present, data processing is cumbersome, processing time Slowly, the unfavorable conditions such as complicated influences and restricts accuracy and the operability of gas outbursts Prediction.Using wide WTC Gas Outburst Parameters Instruments, measure drilling cuttings desorption of mash gas pressure to calculate drilling cuttings desorption of mash gas amount, the instrument using constant volume manometric method Device has used 8-bit microprocessor to be controlled as core, can data acquisition and index meter using monochromatic LCD as display The functions such as calculation, data storage, but as embedded and Digital Signal Processing development, traditional gas outbursts Prediction instrument are deposited It is complicated acquisition speed is slow, measurement accuracy is low, stability and man-machine interaction are poor, consume energy the shortcomings of big.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, and a kind of high-precision coal mine gas is provided and is protruded in advance Instrument is surveyed, the prediction instrument acquisition speed is fast, high certainty of measurement, and stability and man-machine interaction are good, and low-power consumption is easy to operate.

Realizing the technical solution of the utility model aim is：

A kind of high accuracy coal mine gas outburst prediction instrument, including main control module, gas pressure sensor module, AD data turn Change the mold block, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH memory modules, in SRAM Storing module and USB data interface, further include voice module；The main control module respectively with AD data conversion modules, air/temperature Spend sensor, power module, keyboard input module, LCD display module, FLASH memory modules, sram memory module, usb data Interface is connected with voice module；AD data conversion modules are also connected with gas pressure sensor module.

The main control module, using the core controller of high-frequency ARM Cortex-M4, ensures the smoothness of system operatio Property and stability, and combine interface and phonetic function that full-color LCD and voice module are supplied to operating personnel close friend.

The gas pressure sensor module, including gas pressure sensor and current source circuit；Current source circuit is Gas pressure sensor is powered；The gas pressure sensor, is numeral gauge pressure type sensor MEAS 13A；

The current source circuit, including the first capacitance, the second capacitance, the 3rd capacitance, the 4th capacitance, the 5th capacitance, One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first MOSFET pipes, the 2nd MOSFET pipes, the first operational amplifier and the second operational amplifier；One end of first capacitance respectively with gas The D poles connection of No. 5 pins, the first MOSFET pipes of pressure sensor MEAS 13A chips, other end ground connection；The one of second capacitance End ground connection, the other end are connected with the D poles of the first MOSFET pipes；The S poles of first MOSFET pipes respectively with first resistor, second resistance One end connection, the G poles of the first MOSFET pipes are connected with one end of the 4th resistance；The other end of 4th resistance is put with the first computing The signal output part connection of big device；The one end of the signal output part of first operational amplifier also with the 3rd capacitance is connected, the first fortune The other end with the 3rd capacitance, the other end of second resistance are connected the negative input end of calculation amplifier respectively；First operational amplifier Positive input terminal one end with 3rd resistor, the D poles of the 2nd MOSFET pipes are connected respectively；First resistor and 3rd resistor it is another Terminate 5V analog powers；The G poles of 2nd MOSFET pipes are connected with one end of the 5th resistance, the S poles of the 2nd MOSFET pipes respectively with One end connection of 7th resistance, the 8th resistance；The other end ground connection of 7th resistance；The signal output part of second operational amplifier point One end of the other end, the 4th capacitance not with the 5th resistance is connected, the positive input terminal of the second operational amplifier and the 6th resistance One end connects, and the other end with the 4th capacitance, the other end of the 8th resistance are connected the negative input end of the second operational amplifier respectively； The one end of the other end of 6th resistance respectively with AD data conversion modules, the 5th capacitance is connected；The other end ground connection of 5th capacitance.

The AD data conversion modules, including signal conditioning circuit, AD data converters and reference voltage circuit.

The AD data converters, are 24AD data converter of the type based on AD7768 chips, can be high-precision The measurement measured signal of degree and by gain control in condition and range, and utilize the sinc5 carried inside AD data converters Digital filter is filtered, the other end connection of No. 59 pins of AD7768 chips and the 6th resistance of current source circuit.

The signal conditioning circuit, including the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd Resistance, the 14th resistance, the 6th capacitance, the 7th capacitance, the 8th capacitance and the 3rd operational amplifier；One end of 9th resistance and gas No. 4 pins connection of pressure sensor MEAS 13A chips；One end of tenth resistance and gas pressure sensor MEAS 13A No. 10 pins connection of chip；The negative input end of 3rd the operational amplifier other end with the 9th resistance, the 11st resistance respectively One end connection, the other end with the tenth resistance, one end of the 12nd resistance are connected positive input terminal respectively；3rd operational amplifier Positive output end the other end with the 11st resistance, one end of the 13rd resistance are connected respectively；3rd operational amplifier it is negative defeated The other end with the 12nd resistance, one end of the 14th resistance are connected outlet respectively；The other end of 13rd resistance is respectively with One end of six capacitances, No. 63 pins connection of one end of the 7th capacitance, AD7768 chips；The other end of 14th resistance respectively with One end of 7th capacitance, No. 64 pins connection of one end of the 8th capacitance, AD7768 chips；6th capacitance and the 8th capacitance it is another One end is grounded.

The reference voltage circuit, including four-operational amplifier, ADR4540 chips, the 25th capacitance, the 20th Six capacitances, the 27th capacitance；The signal output part of four-operational amplifier respectively the negative input end with itself, the 25th electricity One end of appearance, No. 5 pin REF- interfaces connection of AD7768 chips；The positive input terminal of four-operational amplifier is respectively with the 20th One end of six capacitances, No. 3 pins connection of ADR4540 chips；No. 1 pin of ADR4540 chips respectively with+5V voltages, second One end connection of 17 capacitances；No. 2 pins of ADR4540 chips, the other end of the 25th capacitance, the 26th capacitance it is another One end, the other end ground connection of the 27th capacitance.

The voice module, including NY3P016BS8 chips, the 28th capacitance, the 18th resistance, the 19th resistance, 20th resistance, the 21st resistance, the 22nd resistance and the 23rd resistance；No. 1 pin of NY3P016BS8 chips with One end connection of 28th capacitance, No. 2 pins meet SPEAK2, and No. 3 pins meet SPEAK1, and No. 4 pins connect+3.3V voltages, No. 5 Pin is grounded, and one end with the 20th resistance, one end of the 23rd resistance are connected No. 6 pins respectively, and No. 7 pins are respectively with the One end of 19 resistance, one end connection of the 22nd resistance, No. 8 pins one end with the 18th resistance, the 21st respectively One end connection of resistance；28th capacitance, the 18th resistance, the 19th resistance, the other end ground connection of the 20th resistance；Second The other end of 11 resistance, the other end of the 22nd resistance, the other end of the 23rd resistance are connected with main control module.

The USB data interface, including the 29th capacitance, USB interface, diode, the 24th resistance, the 20th Five resistance and PRTRV0U2X chips；No. 1 pin of USB interface connects the input terminal of diode, and No. 2 pins are respectively with the 24th One end of resistance, No. 2 pins connection of PRTRV0U2X chips, No. 3 pins respectively with the 25th resistance, PRTRV0U2X chips The connection of No. 3 pins, No. 4 pins connect digitally；One end with the 29th capacitance, 5V power supplys connect the output terminal of diode respectively Connect, another termination of the 29th capacitance is digitally；No. 1 pin of PRTRV0U2X chips connects digitally, and No. 4 pins connect 5V electricity Source, the 24th resistance, the other end of the 25th resistance are connected with main control module.

Beneficial effect：A kind of high-precision coal mine gas outburst prediction instrument provided by the utility model, can high precision collecting solution Inhale gas pressure, accurately measure environment temperature and live atmospheric pressure, by software correction algorithm reduce temperature band come environment Influence measurement relative error can be reduced to 0.368%, there is very big practical value.Good operation interface and voice prompt work( The operation error rate of operating personnel can be effectively reduced, effectively reduces what unnecessary repetitive operation and manual operation were brought Data error.The stability for further increasing reliability, accuracy and instrument that Gas Outburst detects could be more accurately pre- The degree of danger that driving face protrudes is surveyed, and then reduces and avoid the generation of gas burst accident.

Brief description of the drawings

Fig. 1 is the block diagram of the utility model；

Fig. 2 is gas pressure sensing module circuit diagram；

Fig. 3 is the a/d converter circuit diagram of signal condition and AD7768 chips；

Fig. 4 is reference voltage circuit figure；

Fig. 5 is voice module circuit diagram；

Fig. 6 is USB data interface circuit diagram.

Embodiment

The utility model is further elaborated with reference to the accompanying drawings and examples, but is not the limit to the utility model It is fixed.

Embodiment：

As shown in Figure 1, a kind of high accuracy coal mine gas outburst prediction instrument, including main control module, gas pressure sensor mould Block, AD data conversion modules, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH storages Module, sram memory module and USB data interface, further include voice module；The main control module respectively with AD data conversions Module, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH memory modules, sram memory Module, USB data interface are connected with voice module；AD data conversion modules are also connected with gas pressure sensor module.

System principle：Tested coal sample is positioned in measurement hermetically sealed can first, then with pipe special by hermetically sealed can with it is high The baroceptor MEAS13A connections of the gas pressure sensing module of precision gas in mine outburst forecast instrument, baroceptor meeting The pressure value discharged during coal sample desorption of mash gas is converted into analog electrical signal, afterwards by the AD7768 cores of AD data conversion modules Piece converts analog signals into digital data transmission of the gain in condition and range to main control module.Similarly, live atmospheric pressure temperature Sensor is spent also to calculate the digital data transmission of live atmospheric pressure and temperature parameter to main control module, these digital quantities by K1 values Method carries out calculating processing, you can calculates the drilling cuttings gas K for gas outbursts Prediction₁Index.FLASH modules can be used for storing Drill hole information, K under working face₁The indexs such as value, coal powder quantity of bore.LCD can implement to show in gatherer process by the form of drawing Operator's data acquisition situation is given, voice module can remind the item that operator should be noted and operation wrong in each operation False information.USB data interface transmits data to host computer, and host computer can be analyzed in detail measurement data, upper Machine also can carry out system reparation by USB data interface to the detector.SRAM is cached for system data, system power supply module Working power is provided for system, Keysheet module provides human-computer interaction for operator.

As shown in Fig. 2, the gas pressure sensor module, including gas pressure sensor and current source circuit；Electricity Current source circuit is powered for gas pressure sensor；The gas pressure sensor, is digital gauge pressure type sensor MEAS 13A, Working frequency is provided by 32MHz crystal oscillators；

The current source circuit, including the first capacitance C1, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance C4, the 5th Capacitance C5, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th Resistance R7, the 8th resistance R8, the first MOSFET pipes, the 2nd MOSFET pipes, the first operational amplifier U1 and the second operational amplifier U2；The D of one end of first capacitance C1 No. 5 pins with gas pressure sensor MEAS 13A chips, the first MOSFET pipes respectively Pole connects, other end ground connection；One end ground connection of second capacitance C2, the other end are connected with the D poles of the first MOSFET pipes；First The one end of the S poles of MOSFET pipes respectively with first resistor R1, second resistance R2 is connected, the G poles of the first MOSFET pipes and the 4th electricity Hinder one end connection of R4；The other end of 4th resistance R4 is connected with the signal output part of the first operational amplifier U1；First computing The one end of the signal output part of amplifier U1 also with the 3rd capacitance C3 is connected, the negative input end of the first operational amplifier U1 respectively with The other end connection of the other end, second resistance R2 of 3rd capacitance C3；The positive input terminal of first operational amplifier U1 is respectively with One end of three resistance R3, the D poles connection of the 2nd MOSFET pipes；Another termination 5V simulation electricity of first resistor R1 and 3rd resistor R3 Source；The G poles of 2nd MOSFET pipes are connected with one end of the 5th resistance R5, the S poles of the 2nd MOSFET pipes respectively with the 7th resistance R7, One end connection of 8th resistance R8；The other end ground connection of 7th resistance R7；The signal output part difference of second operational amplifier U2 One end of the other end, the 4th capacitance C4 with the 5th resistance R5 is connected, the positive input terminal of the second operational amplifier U2 and the 6th electricity Hinder one end connection of R6, the negative input end of the second operational amplifier U6 other end with the 4th capacitance C4, the 8th resistance R8 respectively The other end connection；The other end of 6th resistance R6 respectively No. 59 pins with AD data converter AD7768 chips, the 5th electricity Hold one end connection of C5；The other end ground connection of 5th capacitance C5.

The AD data conversion modules, including signal conditioning circuit, AD data converters and reference voltage circuit；

The AD data converters, are 24AD data converter of the type based on AD7768 chips, can be high-precision Measurement measured signal and gain is controlled in condition and range, and utilize the sinc5 numbers carried inside AD data converters Word wave filter is filtered, the other end connection of No. 59 pins of AD7768 chips and the 6th resistance R6 of current source circuit.

As shown in figure 3, the signal conditioning circuit, including the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8 and the 3rd operational amplifier U3；One end of 9th resistance R9 connects with No. 4 pins of gas pressure sensor MEAS 13A chips Connect；One end of tenth resistance R10 is connected with No. 10 pins of gas pressure sensor MEAS 13A chips；3rd operational amplifier The other end with the 9th resistance R9, one end of the 11st resistance R11 are connected the negative input end of U3 respectively, and positive input terminal is respectively with One end connection of the other end, the 12nd resistance R12 of ten resistance R10；The positive output end of 3rd operational amplifier U3 is respectively with One end connection of the other end, the 13rd resistance R13 of 11 resistance R11；The negative output terminal of 3rd operational amplifier U3 respectively with One end connection of the other end, the 14th resistance R14 of 12nd resistance R12；The other end of 13rd resistance R13 is respectively with the 6th One end of capacitance C6, No. 63 pins connection of one end of the 7th capacitance C7, AD7768 chips；The other end of 14th resistance R14 One end with the 7th capacitance C7, one end of the 8th capacitance C8, No. 64 pins of AD7768 chips are connected respectively；6th capacitance C6 and The other end ground connection of 8th capacitance C8.

As shown in figure 4, the reference voltage circuit, including four-operational amplifier U4, ADR4540 chip, the 20th Five capacitance C25, the 26th capacitance C26, the 27th capacitance C27；The signal output part of four-operational amplifier U4 respectively with The negative input end of itself, No. 5 pin REF- interfaces connection of one end of the 25th capacitance C25, AD7768 chips；4th computing One end with the 26th capacitance C26, No. 3 pins of ADR4540 chips are connected the positive input terminal of amplifier U4 respectively； The one end of No. 1 pin of ADR4540 chips respectively with+5V voltages, the 27th capacitance C27 is connected；No. 2 of ADR4540 chips Pin, the other end of the 25th capacitance C25, the other end, the other end of the 27th capacitance C27 of the 26th capacitance C26 Ground connection.

The working frequency of gas pressure sensor is provided by 32MHz crystal oscillators, the output reference voltage of AD data conversion modules There is provided by ADA4841 and ADR4540 modules.The output difference signal of sensor is via signal conditioning circuit and AD data converters Differential interface connects, and differential signal can disturb and reach low noise acoustic sensitivity with suppression common mode, improve measurement accuracy.Concrete analysis As follows, sensor is Gas Outburst pressure conversion into electric signal, Full-span output 100mV, by controlling AD data conversion moulds The gain register and imbalance register of block, measured signal gain can be controlled in suitable scope, simplify and passed with exterior The interface circuit of sensor.The sinc5 digital filters that selection AD data converters carry carry out highly-precise filtering, improve data and turn The precision changed and switching rate is ensured.

As shown in figure 5, the voice module, including NY3P016BS8 chips, the 28th capacitance C28, the 18th electricity Hinder R18, the 19th resistance R19, the 20th resistance R20, the 21st resistance R21, the electricity of the 22nd resistance R22 and the 23rd Hinder R23；No. 1 pin of NY3P016BS8 chips is connected with one end of the 28th capacitance C28, and No. 2 pins meet SPEAK2, No. 3 Pin meets SPEAK1, and No. 4 pins connect+3.3V voltages, No. 5 pins ground connection, No. 6 pins respectively one end with the 20th resistance R20, One end connection of 23rd resistance R23, No. 7 pins one end with the 19th resistance R19, the 22nd resistance R22 respectively One end connects, and one end with the 18th resistance R18, one end of the 21st resistance R21 are connected No. 8 pins respectively；28th Capacitance C28, the 18th resistance R18, the 19th resistance R19, the other end ground connection of the 20th resistance R20；21st resistance R21 The other end, the other end, the other end of the 23rd resistance R23 of the 22nd resistance R22 be connected with main control module.

As shown in fig. 6, the USB data interface, including the 29th capacitance C29, USB interface, diode D1, second 14 resistance R24, the 25th resistance R25 and PRTRV0U2X chip；No. 1 pin of USB interface connects the input of diode D1 End, one end with the 24th resistance R24, No. 2 pins of PRTRV0U2X chips are connected No. 2 pins respectively, No. 3 pin difference It is connected with No. 3 pins of the 25th resistance R25, PRTRV0U2X chip, No. 4 pins connect digitally；The output terminal of diode D1 One end with the 29th capacitance C29,5V power supplys are connected respectively, and another termination of the 29th capacitance C29 is digitally； No. 1 pin of PRTRV0U2X chips connects digitally, and No. 4 pins connect 5V power supplys, the 24th resistance R24, the 25th resistance The other end of R25 is connected with main control module.

Claims

1. a kind of high accuracy coal mine gas outburst prediction instrument, it is characterised in that including main control module, gas pressure sensor mould Block, AD data conversion modules, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH storages Module, sram memory module and USB data interface, further include voice module；The main control module respectively with AD data conversions Module, air/temperature sensor, power module, keyboard input module, LCD display module, FLASH memory modules, sram memory Module, USB data interface are connected with voice module；AD data conversion modules are also connected with gas pressure sensor module；

The main control module, using the core controller of high-frequency ARM Cortex-M4, ensure system operatio fluency and Stability, and the full-color LCD of combination and voice module are supplied to interface and the phonetic function of operating personnel close friend；

The AD data converters, are 24AD data converter of the type based on AD7768 chips, high-precision can be surveyed Measure measured signal and by gain control in condition and range, and utilize the sinc5 numeral filters carried inside AD data converters Ripple device is filtered, the other end connection of No. 59 pins of AD7768 chips and the 6th resistance of current source circuit.

A kind of 2. high-precision coal mine gas outburst prediction instrument according to claim 1, it is characterised in that the current source Circuit, including the first capacitance, the second capacitance, the 3rd capacitance, the 4th capacitance, the 5th capacitance, first resistor, second resistance, the 3rd Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first MOSFET are managed, the 2nd MOSFET is managed, First operational amplifier and the second operational amplifier；One end of first capacitance respectively with gas pressure sensor MEAS 13A chips No. 5 pins, the first MOSFET pipes D poles connection, the other end ground connection；One end ground connection of second capacitance, the other end and first The D poles connection of MOSFET pipes；The one end of the S poles of first MOSFET pipes respectively with first resistor, second resistance is connected, and first The G poles of MOSFET pipes are connected with one end of the 4th resistance；The other end of 4th resistance and the signal output of the first operational amplifier End connection；The one end of the signal output part of first operational amplifier also with the 3rd capacitance is connected, the first operational amplifier it is negative defeated Entering end, the other end with the 3rd capacitance, the other end of second resistance are connected respectively；The positive input terminal difference of first operational amplifier One end, the D poles of the 2nd MOSFET pipes with 3rd resistor are connected；Another termination 5V of first resistor and 3rd resistor simulation electricity Source；The G poles of 2nd MOSFET pipes are connected with one end of the 5th resistance, the S poles of the 2nd MOSFET pipes respectively with the 7th resistance, the 8th One end connection of resistance；The other end ground connection of 7th resistance；The signal output part of second operational amplifier respectively with the 5th resistance The other end, the 4th capacitance one end connection, the positive input terminal of the second operational amplifier is connected with one end of the 6th resistance, second The other end with the 4th capacitance, the other end of the 8th resistance are connected the negative input end of operational amplifier respectively；6th resistance it is another The one end of one end respectively with AD data conversion modules, the 5th capacitance is connected；The other end ground connection of 5th capacitance.

A kind of 3. high-precision coal mine gas outburst prediction instrument according to claim 1, it is characterised in that the signal tune Manage circuit, including the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 6th Capacitance, the 7th capacitance, the 8th capacitance and the 3rd operational amplifier；One end of 9th resistance and gas pressure sensor MEAS 13A No. 4 pins connection of chip；One end of tenth resistance is connected with No. 10 pins of gas pressure sensor MEAS 13A chips；The The other end with the 9th resistance, one end of the 11st resistance are connected the negative input end of three operational amplifiers respectively, positive input terminal point One end of the other end, the 12nd resistance not with the tenth resistance is connected；The positive output end of 3rd operational amplifier is respectively with the tenth One end connection of the other end of one resistance, the 13rd resistance；The negative output terminal of 3rd operational amplifier respectively with the 12nd resistance The other end, the 14th resistance one end connection；The other end of 13rd resistance one end with the 6th capacitance, the 7th capacitance respectively One end, AD7768 chips No. 63 pins connection；The other end of 14th resistance respectively one end with the 7th capacitance, the 8th electricity One end of appearance, No. 64 pins connection of AD7768 chips；The other end of 6th capacitance and the 8th capacitance is grounded.

A kind of 4. high-precision coal mine gas outburst prediction instrument according to claim 1, it is characterised in that the reference electricity Volt circuit, including four-operational amplifier, ADR4540 chips, the 25th capacitance, the 26th capacitance, the 27th capacitance； The signal output part of the four-operational amplifier negative input end with itself, one end of the 25th capacitance, AD7768 chips respectively No. 5 pin REF- interfaces connection；The positive input terminal of four-operational amplifier respectively one end with the 26th capacitance, No. 3 pins connection of ADR4540 chips；No. 1 pin of ADR4540 chips respectively with+5V voltages, the 27th capacitance one End connection；No. 2 pins of ADR4540 chips, the other end of the 25th capacitance, the other end of the 26th capacitance, the 20th The other end ground connection of seven capacitances.

A kind of 5. high-precision coal mine gas outburst prediction instrument according to claim 1, it is characterised in that the voice mould Block, including NY3P016BS8 chips, the 28th capacitance, the 18th resistance, the 19th resistance, the 20th resistance, the 21st Resistance, the 22nd resistance and the 23rd resistance；No. 1 pin of NY3P016BS8 chips and one end of the 28th capacitance connect Connect, No. 2 pins meet SPEAK2, and No. 3 pins meet SPEAK1, and No. 4 pins connect+3.3V voltages, No. 5 pin ground connection, No. 6 pin difference One end of one end, the 23rd resistance with the 20th resistance is connected, No. 7 pins one end with the 19th resistance, second respectively One end connection of 12 resistance, one end with the 18th resistance, one end of the 21st resistance are connected No. 8 pins respectively；Second 18 capacitances, the 18th resistance, the 19th resistance, the other end ground connection of the 20th resistance；The other end of 21st resistance, The other end of 22 resistance, the other end of the 23rd resistance are connected with main control module.

A kind of 6. high-precision coal mine gas outburst prediction instrument according to claim 1, it is characterised in that the USB numbers According to interface, including the 29th capacitance, USB interface, diode, the 24th resistance, the 25th resistance and PRTRV0U2X cores Piece；No. 1 pin of USB interface connects the input terminal of diode, No. 2 pins one end with the 24th resistance, PRTRV0U2X respectively No. 2 pins connection of chip, No. 3 pins of No. 3 pins respectively with the 25th resistance, PRTRV0U2X chips are connected, No. 4 pipes Foot connects digitally；One end with the 29th capacitance, 5V power supplys are connected the output terminal of diode respectively, the 29th capacitance it is another One termination is digitally；No. 1 pin of PRTRV0U2X chips connects digitally, and No. 4 pins connect 5V power supplys, the 24th resistance, second The other end of 15 resistance is connected with main control module.