64-channel mine gas sensor intelligent calibrator based on single-chip microcomputer

Abstract

The invention relates to a mining gas sensor calibration system, and particularly relates to a 64-path multi-concentration mining gas sensor intelligent calibration system. The system comprises a microcontroller unit, a signal conditioning unit, a communication interface unit and a gas path system, wherein the microcontroller unit comprises a singlechip, a mated power source, a crystal oscillator and a reset circuit; the communication interface unit comprises an RS-232 serial communication module; the signal conditioning unit comprises an acquisition circuit for sensor output signal and an analog signal conditioning circuit for gas flow control; the gas path system comprises a 64-path control relay, a flow controller and a solenoid valve; and the signal conditioning unit, the gas path system and a gas sensor outage signal are connected with the singlechip by an I / O (input / output) interface, and the gas path system controls eight cascaded shifting registers to output the control signal of a 64-path relay via the I / O interface. The system reduces investment of the coal mine on the calibration and maintenance of the mining gas sensor and reduces accumulation of calibration errors of the sensor caused by different equipment errors.

Description

Technical field [0001] The invention relates to a mine gas sensor calibration system, in particular to a 64-channel multi-concentration mine gas sensor intelligent calibration system. Background technique [0002] Mine gas sensors, as the main device that can reflect the concentration of various flammable, explosive, toxic and harmful gases in the underground working environment, are widely used in coal mine safety monitoring and monitoring systems. The main categories include gas sensors, carbon monoxide sensors, and oxygen. The detection accuracy of these sensors is directly related to the reliability of the entire coal mine safety monitoring system, and plays a decisive role in the real-time and accuracy of detection and monitoring. At present, the gas sensors used in coal mines are based on thermal It is made of catalytic principle and can output a current signal or a frequency signal that characterizes the concentration of the detected gas. Due to the characteristics of the ...

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Problems solved by technology

[0002] As the main device that can reflect the concentration of various flammable, explosive, toxic and harmful gases in the underground working environment, mine gas sensors are widely used in coal mine safety monitoring and monitoring systems. The main categories included are gas sensors, carbon monoxide sensors, and oxygen sensors. Sensors, hydrogen sulfide sensors, etc. The detection accuracy of these sensors is directly related to the reliability of the entire coal mine safety monitoring system, and plays a decisive role in the real-time and accuracy of detection and monitoring. At present, the gas sensors used in coal mines are based on thermal Made of catalytic principle, it can output the current signal or frequency signal representing the concentration of the gas to be detected. Due to the characteristics of the thermal catalytic gas sensor, there will inevitably be zero point drift and range drift during use, which will not accurately reflect the detected gas concentration. Therefore, it must be regularly calibrated to meet the requirements of coal mine safety production. Article 162 of the "Coal Mine Safety Regulations" stipulates that "methane detection equipment such as methane sensors and portable methane detection and alarm devices that use carrier catalytic components, Calibration gas samples and air samples must be used for calibration every 7 days, and the methane over-limit power-off function must be tested every 7 days”

[0003] At present, the automatic calibration device can calibrate up to 8 sensors at the same time. For coal mines that need to adjust a large number of gas sensors, it is necessary to purchase 5-8 mine gas calibrators at the same time to meet the needs of mine safety production. The cost of equipment increases the workload of calibration. Based on this, we have developed an automatic calibrator that can simultaneously calibrate 64 sensors. Automatic adjustment of various concentrations, and save and print the calibration data, and at the same time, the change of the calibration data can be monitored in real time during the calibration process

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