CN101988912B - Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines - Google Patents
Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines Download PDFInfo
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- CN101988912B CN101988912B CN201010274817XA CN201010274817A CN101988912B CN 101988912 B CN101988912 B CN 101988912B CN 201010274817X A CN201010274817X A CN 201010274817XA CN 201010274817 A CN201010274817 A CN 201010274817A CN 101988912 B CN101988912 B CN 101988912B
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Abstract
The invention provides a digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines, comprising a microcontroller unit, a signal conditioning unit, a communication interface unit, a keyboard display unit, a touch control unit and a gas circuit system; and in the invention, the communication connection is carried out on the units and modules of the checking instrument. In the invention, the existing checking instrument structure is improved, and the central processing unit (CPU) technology, the electronic technology and the control technology are taken as main technologies, thereby solving the problems of low speed, low accuracy and high labor intensity of the existing checking instrument and providing services for underground safety production of coal mines.
Description
Technical field
The present invention relates to a kind of gas sensor tester, especially a kind of mining gas sensor automatic calibrating instrument that is used for many concentration multichannel.
Background technology
Mining gas sensor is meant firedamp sensor, carbon monoxide transducer, negative pressure transducer and air velocity transducer.In coal mine safety monitoring system, be directly connected to the reliability and the sensitivity of coal mine safety monitoring system as the sensor that detects, to the monitoring decisive role.For the accuracy that guarantees that mining gas sensor is measured, need regularly carry out verification.In safety regulations in coal mine " the 162nd regulation; " methane transducer, portable methane detection alarming instrument etc. adopt the methane checkout equipment of carrier catalyst element; per 7 days must be with calibration gas appearance and the adjustment of air appearance once, must test the methane power down function that transfinites in per 7 days ".
Manual tester and remote control tester are adopted in existing colliery, and its manual tester mainly is made up of standard gas appearance steel cylinder, hose, flowmeter and reduction valve.During check sensor is connected standard gas appearance with hose and flowmeter; Whether make reduction valve standard airshed to 200ml/min through manual adjustments, it is consistent with standard gas concentration to observe measured value, if inconsistent; Regulate the sensor knob by screwdriver, make sensor readings identical with normal concentration.Manual adjustments standard airshed makes measurement result have artificial deviation, and once can only sensor of verification.Its remote control tester is on the basis of manually verification, to have increased distant control function, makes sensor readings identical with normal concentration through remote keying.
Existing notification number is: a kind of " the mining methane transducer tester " of CN201508341U; This utility model comprises the methane flow meter; Said methane flow meter is arranged on the telescopic lever; Said telescopic lever is provided with the pull bar fixed cover, is provided with a hook opening at the telescopic lever top and makes progress and a hook two hooks that Open Side Down.The utility model advantage is the methane flow meter is arranged on the telescopic lever, and said telescopic lever is provided with the pull bar fixed cover, is provided with a hook opening at the telescopic lever top and makes progress and a hook two hooks that Open Side Down; During methane checkout equipments such as detection methane transducer; With the telescopic lever elongation, the hook that makes progress with the hook opening can easily take off methane transducer, after connection and detection are accomplished; Hang back original position to methane transducer again and get final product, make the verification operation convenient and swift; Said methane flow meter is connected with telescopic lever through angle bar, installs and fixes easy and firm.
The tester that adopt in above-mentioned colliery; Be to adopt the sensor of single structure to carry out adjustment to single concentration; And manually tester is single owing to its structure with the remote control tester, exists problems such as labour intensity big and ineffective problem, particularly checking precision are low during verification.Therefore, designing the mining gas sensor tester of a kind of digital intelligent is the practical problems that presses for solution under the existing coal mine.
Based on this, the inventor improves existing manual tester and remote control tester based on DSP, has invented a kind of mining gas sensor intelligent checking appearance, and its summary of the invention is following:
Summary of the invention
The present invention provides a kind of mining gas sensor intelligent checking appearance based on DSP; Realize simultaneously automatic verification to the mining gas sensor of many concentration multichannel; To solve existing tester and remote control tester because its structure is single; Exist the low problem of the big and ineffective problem, particularly checking precision of labour intensity during verification.
To achieve these goals, the technical scheme that the present invention taked comprises micro controller unit, signal condition unit, communications interface unit, keyboard display unit, touch control module and air-channel system, wherein:
Described micro controller unit comprises CPU, the outer RAM of sheet, power supply, crystal oscillating circuit, jtag interface circuit, and the LCD pilot lamp reaches and wire jumper;
Described communications interface unit comprises the RS-232 driving circuit;
Described signal condition unit comprises the modulate circuit of frequency quantity signal and the modulate circuit of simulating signal;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit;
Described touch control module comprises main frame and touch-screen;
Described air-channel system comprises No. 16 pilot relays, flow controller and solenoid valve;
To each module of the above, communications interface unit is connected with microcontroller through serial communication interface module (SCI), and signal condition unit, keyboard display unit, air-channel system are connected with microcontroller through the I/O mouth; The outer RAM of sheet in the described micro controller unit is connected with DSP through 16 address data bus and chip select line; The serial communication modular of described communications interface unit DSP is connected with host computer through chip for driving MAX3232; The frequency quantity signal of described signal condition unit is connected with the IO mouth of DSP through light-coupled isolation and buffer circuit, and analog signals is connected with DSP through the ADC in the sheet through RC LPF, voltage follow and the conditioning of difference scale operation; Matrix keyboard end line in the described keyboard display unit is connected with the IO mouth of DSP, and LCD is connected with the I of DSP through level switch module; Described touch control module is connected with DSP through communications interface unit; Described air-channel system is the IO mouth output control signal through DSP, through light-coupled isolation, latch and driving circuit goes to control the break-make of No. 16 relays; Described flow control is that the voltage signal after D/A and conditioning is exported to the aperture that flow controller is controlled the solenoid-operated proportional variable valve; The size of its output voltage signal is to set according to the quantity of the sensor of want verification; I.e. 200 * N (ml/min); Wherein, N is a number of sensors, obtains stable flow rate 200ml/min to guarantee each sensor; Described flow is introduced the accuracy of closed-loop control with dependable flow.
The present invention is a kind of based on the mining gas sensor intelligent checking of DSP appearance; Through architecture advances to existing tester and remote control tester; And combine the CPU technology, and solved existing tester and remote control tester because its structure is single, exist the big and ineffective problem of labour intensity during verification; Especially low problems of equipment precision such as verification firedamp sensor, carbon monoxide transducer, negative pressure transducer and air velocity transducer under coal mine; Improved the precision of calibration equipment, guaranteed the reliability of inspection machine under the coal mine, for Safety of Coal Mine Production provides service.
Appearance of the present invention can be used keyboard operation, also can directly on touch-screen, control.Except that control, also can safeguard that the actual value that converts automatically shows to gas sensor type, range etc., very directly perceived.In addition, the flow value that feeds back to and the comparison of set-point, the aperture of constantly adjusting the solenoid-operated proportional variable valve through PREDICTIVE CONTROL is to realize the stable accurately control (N * 200ml/min, wherein N is a number of sensors) of flow.
Compare with existing tester, its major advantage and good effect are; (1) powerful compatibility is good.8 gas sensors of verification (quantity can be expanded) simultaneously, but the mining gas sensor of verification all kinds, various models; (2) verification speed is fast, and automaticity is high, and precision is high.Through automatic control enough flows can be provided, guarantee that when many gas sensors of verification each gas flow that obtains is stabilized in 200ml/min, has guaranteed adjusting accuracy; (3) can realize the adjustment of various ways, like the automatic adjustment of many concentration, the automatic adjustment of single concentration and the adjustment of individual choosing intelligence etc.; (4) system architecture is comparatively clear, ease for operation strong, the check results intuitive display; (5) more integrated, the portability of product, high, low, the long service life of cost of reliability.
Description of drawings
Fig. 1 is the theory diagram that the present invention is based on the mining gas sensor tester of DSP;
Fig. 2 is the structured flowchart that the present invention is based on the mining gas sensor tester of DSP;
Fig. 3 is a microcontroller schematic diagram of the present invention;
Fig. 4 is the modulate circuit of frequency quantity signal of the present invention;
Fig. 5 is the modulate circuit of analog signals of the present invention;
Fig. 6 is communication interface circuit figure of the present invention;
Fig. 7 is display circuit figure of the present invention.
Fig. 8 is a relay control chart of the present invention;
Fig. 9 is flow controller control circuit figure of the present invention.
Embodiment
These professional secondary technology personnel make further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention, so that can realize being as the criterion after having read this embodiment.
Of Fig. 1, a kind of mining gas sensor intelligent checking appearance based on DSP of the present invention comprises micro controller unit, signal condition unit, communications interface unit, keyboard display unit, touch control module and air-channel system.Wherein:
Described micro controller unit, promptly the minimum system of DSP comprises CPU, the outer RAM of sheet, power supply, crystal oscillating circuit, jtag interface circuit, LCD pilot lamp and necessary wire jumper.
Described communications interface unit comprises the RS-232 driving circuit.
Described signal condition unit comprises the modulate circuit of frequency quantity signal and the modulate circuit of simulating signal.
Described keyboard display unit comprises keyboard interface circuit (3 * 8 matrix keyboard) and LCD display circuit.
Described touch control module comprises main frame and touch-screen.
Of Fig. 2, described air-channel system comprises No. 16 pilot relays (8 tunnel gas concentrations and 8 road gas sensors), flow controller and solenoid valve.8 tunnel gas concentrations can be any gas or concentration, and the selection during with verification is as the criterion.
To each above-mentioned module, communications interface unit is connected with microcontroller through serial communication interface module (SCI).Frequency quantity signal condition unit, keyboard unit, display unit, air-channel system all are to be connected with microcontroller through the I/O mouth, and the modulate circuit of simulating signal meets the ADC of DSP.
Of Fig. 3; Micro controller unit CPU adopts the TMS320LF2407DSP chip of TI company; Expanded the RAM of a slice 64 * 16bit; Adopt the CY7C1021CV33 chip of Cypress company, it links to each other with DSP through 16 address data bus, chip select line, read-write line, and emulator is connected with DSP through the JTAG emulation interface.Power module is to adopt the Switching Power Supply of 12V to convert the 5V direct current to through the L7805 three terminal regulator.Voltage transitions adopts the 5V/3V high-performance voltage stabilizing chip TPS7333Q general+5V of TI company to convert to+3.3V confession DSP use, adopts 10mH inductance and 0 Ω resistance to isolate between modulus voltage and the modulus ground respectively.The MAX811 chip that reset circuit adopts MAXIM company to have the manual reset function is realized.Clock signal adopts the active crystal oscillator of 10M to provide.
As shown in Figure 4, the isolating, be connected with the IO mouth of DSP after the SN74LS244N buffering of the frequency quantity of signal condition unit (gas sensor output) signal through optocoupler TLP521-4.
As shown in Figure 5; The maintenance after A/D nurses one's health, samples, ADC send into DSP to analog quantity (flowmeter output and the output of gas sensor analog quantity transformation) through analog multichannel switch AD7506 gating successively; The A/D conditioning adopts RC LPF, voltage follow and difference scale operation to realize, the resource that the sampling maintenance becomes with ADC employing DSP chip integration.
Of Fig. 6, the SCI communications interface unit has adopted the chip for driving MAX3232 that meets rs-232 standard, realizes the communication between DSP and the host computer through the Modbus agreement.
Of Fig. 7, the display circuit Liquid Crystal Module adopts the CM128640-10SLYB LCD, uses the level translator SN74LVC4245DB of TI company to carry out the bus level conversion between DSP data-interface and the LCD data-interface.
Keyboard adopts 3 * 8 matrix keyboards, is connected with the IO mouth of DSP.
Of Fig. 8, the control signal of IO mouth output latchs and the ULN2803 Darlington drives the break-make that No. 16 relays are controlled in the back through light-coupled isolation TLP521-4, SN74LS273, and then the on off state of control electromagnetic valve.No. 16 relays are controlled the electrically-controlled valve (connect 8 tunnel gas concentrations, also can expand) of 8 road direct current 24V power supply, the solenoid valve (connect 8 road gas sensors, also can expand) of 8 road direct current 24V power supply respectively.
Of Fig. 9, analog-digital chip adopts the TLV5620DAC of TI company, and the D/A modulate circuit adopts voltage follower, according to the aperture of the voltage signal Control Flow controller after the D/A conditioning with control solenoid-operated proportional variable valve.The flow controller range that described air-channel system comprises is 0-2000ml/min; PREDICTIVE CONTROL stablizing with accurate with dependable flow adopted in the closed-loop control of the above flow.
During use, intelligent adjustment detector is installed at first, the personnel of its said technical field can both realize.Next is the use method of operating of intelligent adjustment detector.Intelligence adjustment detector can be used touch screen operation, also can use keyboard operation.
Claims (2)
1. the mining gas sensor intelligent checking appearance based on DSP includes micro controller unit, signal condition unit, communications interface unit, keyboard display unit, touch control module and air-channel system, wherein:
Described micro controller unit comprises that CPU is the outer RAM of DSP, sheet, power supply, crystal oscillating circuit, jtag interface circuit, and the LCD pilot lamp reaches and wire jumper;
Described signal condition unit comprises frequency quantity signal conditioning circuit and analog signal conditioner circuit;
Described communications interface unit comprises the RS-232 driving circuit;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit;
Described touch control module comprises main frame and touch-screen;
Described air-channel system comprises No. 16 pilot relays, flow controller and solenoid valve;
Described communications interface unit is connected with micro controller unit DSP through the serial communication interface module, and signal condition unit, keyboard display unit and air-channel system are connected with the DSP of micro controller unit through the I/O mouth;
Outer RAM is connected with DSP through 16 bit address data buss and chip select line to the sheet in the micro controller unit of the above;
Communications interface unit DSP serial communication modular to the above is connected with host computer through chip for driving MAX3232;
The frequency quantity signal of signal condition unit to the above is connected with the I/O mouth of DSP through light-coupled isolation and buffer circuit, and analog signals is connected with DSP through the ADC in the sheet through RC LPF, voltage follow and the conditioning of difference scale operation;
Matrix keyboard end line in the keyboard display unit of the above is connected with the I/O mouth of DSP, and LCD is connected with parallel I/O mouth of DSP through level switch module;
Touch control module to the above is connected with DSP through communications interface unit;
To the I/O mouth output control signal of air-channel system through DSP of the above, through light-coupled isolation, latch and driving circuit goes to control the break-make of No. 16 relays; The voltage signal of flow control signal after D/A and conditioning exported to the aperture that flow controller is controlled the solenoid-operated proportional variable valve; The size of its output voltage signal is to set according to the quantity of the sensor of want verification; Promptly be that several sensors adjustment simultaneously can guarantee that all each sensor all obtains stable flow rate 200ml/min; The flow of 200 * Nml/min is provided altogether, and wherein, N is a number of sensors;
The flow of the above is introduced the accuracy of closed-loop control with dependable flow.
2. the mining gas sensor intelligent checking appearance based on DSP as claimed in claim 1, wherein:
The frequency quantity signal of described signal condition unit be the frequency of gas sensor become send output, simulating signal be the voltage of flowmeter output with gas sensor change send the voltage or the electric current of output;
Described communications interface unit is the RS-232 serial ports of full duplex;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit, and its keyboard control function and touch-screen control function are compatible fully;
Described touch control module comprises main frame and touch-screen, and its computing machine can safeguard that adjustment is stored, analyzed and prints to data to adjustment system;
Described air-channel system comprises that 16 tunnel controls are respectively solenoid control 8 tunnel gas concentrations of 8 road direct current 24V power supply, solenoid control 8 road gas sensors of 8 road direct current 24V power supply;
The flow controller range that described air-channel system comprises is 0-2000ml/min;
PREDICTIVE CONTROL stablizing with accurate with dependable flow adopted in the closed-loop control of the above flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010274817XA CN101988912B (en) | 2010-09-04 | 2010-09-04 | Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines |
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| CN201010274817XA CN101988912B (en) | 2010-09-04 | 2010-09-04 | Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines |
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| CN101988912A CN101988912A (en) | 2011-03-23 |
| CN101988912B true CN101988912B (en) | 2012-09-26 |
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| CN102279328B (en) * | 2011-05-09 | 2013-10-02 | 惠州市马可尼电子有限公司 | Mining comprehensive detection equipment |
| CN102435221B (en) * | 2011-09-16 | 2015-07-01 | 山西科致成科技有限公司 | Unattended intelligent calibrator for mine gas sensors |
| CN102998421B (en) * | 2012-11-08 | 2016-02-10 | 山西科致成科技有限公司 | SCM Based 64 railways and mineies gas sensor intelligent checking instrument |
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| CN110907598A (en) * | 2019-11-06 | 2020-03-24 | 太原科技大学 | One-network communication detection system for coal mine safety instrument and meter detection center equipment |
| CN112505246B (en) * | 2020-11-11 | 2023-05-02 | 山西科致成科技有限公司 | Digital mining gas sensor calibration and verification device and method |
| CN112505245B (en) * | 2020-11-11 | 2023-02-14 | 山西科致成科技有限公司 | Multi-path standard gas flow control device for detecting mine gas sensor |
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| JPH11345386A (en) * | 1998-05-29 | 1999-12-14 | Denso Corp | Device for detecting gas concentration |
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| US4884435A (en) * | 1987-11-17 | 1989-12-05 | Katsuo Ehara | Odor identifying apparatus and method |
| CN101169345A (en) * | 2006-10-27 | 2008-04-30 | 北京康斯特仪表科技有限公司 | Digital pressure testers |
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