CN116026988A - Mine gas sensor concentration automatic standard detection test bench and test method - Google Patents

Abstract

The invention discloses a mining gas sensor concentration automatic standard test bench and a testing method, wherein the test bench comprises a data processing main control module, an industrial touch screen computer and a plurality of control modules which are sequentially connected with each other: gas pitcher, relief pressure valve, pneumatic electromagnetic directional valve, multichannel gas distributor have a plurality of passageways respectively for in the gas with the gas of gas pitcher evenly divide each passageway, the passageway is including setting gradually: the multi-channel combined standard gas meter controller is used for adjusting the air inlet angle, the high-precision standard gas meter is used for measuring the gas flow, and the gas sensor for the detected mine is used for detecting the gas flow; the data processing main control module is respectively and electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-path combined standard gas meter controller and the gas sensor for the detected mine. The invention does not need to use a remote controller necessary for the traditional technology, realizes the rapid calibration of the mining gas sensor, saves labor intensity, reduces working hours, and has the advantages of high control and calibration precision.

Description

Mine gas sensor concentration automatic standard detection test bench and test method

technical field

The invention relates to the field of calibration and verification of the concentration of a mine gas sensor, in particular to a test platform and a test method for automatic calibration of the concentration of a mine gas sensor.

Background technique

The mine gas sensor is a key component of the coal mine safety monitoring system. It is the front-end detection element of the coal mine safety monitoring system. It can detect the concentration of various toxic and harmful gases in the mine in real time. Common gas sensors use gas sensors as core components. , made on the principle of thermocatalysis. This type of instrument will produce zero point drift and range drift after a period of use. If it is not adjusted in time, the concentration of toxic and harmful gases will exceed the warning line, and the sensor will not issue a timely alarm. The stability and reliability of their work are extremely important for the entire monitoring system to judge whether the downhole concentration exceeds the limit. Therefore, it is necessary to carry out regular calibration and verification to ensure the reliable and stable operation of the production line monitoring equipment.

At present, the commonly used mine gas sensor concentration calibration and verification technology still has the following problems: because the concentration calibration and verification of mine gas sensor has been carried out manually through the remote control method, and the process of standard detection based on infrared remote control technology is cumbersome. The labor intensity is high, the work efficiency is low, and it is easy to cause harm to the human body. The accuracy of the standard inspection is also affected by human factors, and the infrared remote control calibration instrument can only calibrate a single sensor at the same time, and is not suitable for batch calibration of the same type of sensors. .

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a mine gas sensor concentration automatic calibration test bench and testing method, which can quickly improve the calibration efficiency of the mine gas concentration sensor, replace manual work, and can be calibrated and tested in batches. The standard detection accuracy is high, saving the time of frequent sensor replacement.

A mining gas sensor concentration automatic standard detection test bench, including a data processing main control module, an industrial touch screen computer, and sequentially connected: a gas tank, a pressure reducing valve, a pneumatic electromagnetic reversing valve, and a multi-channel gas distributor, wherein, The multi-channel gas distributor is respectively connected with several channels, which are used to divide the gas in the gas tank into each channel. The channels include: a multi-channel combined standard gas meter controller for adjusting the intake angle, for High-precision standard gas meters for measuring gas flow, and gas sensors for mines to be inspected;

The data processing main control module is electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-channel combination standard gas meter controller, and the gas sensor for the mine to be inspected.

Further, the data processing main control module uses the IO pin of the chip to drive the triode, the triode drives the optocoupler isolation chip, and then drives the thyristor chip through the optocoupler isolation chip to drive the pneumatic reversing valve;

The data processing main control module controls the multi-channel combined standard gas meter controller through the standard industrial level 4-20MA signal.

Further, the data processing main control module is provided with a CAN communication unit and a 485 communication unit, which are used to communicate with the detected mine gas sensor;

The industrial touch screen computer is also connected with a printing device for printing test results.

Further, it also includes: an installation frame and a pendant of the tested sensor, wherein the installation frame is provided with: the installation beam of the tested meter and the gas tank installation frame for placing the gas tank, and the tested mine gas sensor passes through the tested sensor pendant Installed on the installation beam of the tested meter;

The data processing main control module and the industrial touch screen computer are respectively installed on the installation frame.

Furthermore, the test bench also includes:

The first meter pipe, the gas pipe is connected to the start electromagnetic reversing valve through the pressure reducing valve through the first meter pipe;

The second meter tube, the pneumatic electromagnetic reversing valve is connected to the multi-way gas distributor through the second meter tube;

The third meter tube, the multi-channel gas distributor is connected to the multi-channel combined standard gas meter controller through the third meter tube;

The fourth meter tube, the multi-channel combined standard gas meter controller is connected to the corresponding high-precision standard gas meter through the fourth meter tube;

The sensor is connected to the gas pipe, and the high-precision standard gas meter is connected to the corresponding detected mine gas sensor through the sensor connection gas pipe.

The present invention also discloses a method for automatically marking the concentration of a mine gas sensor. The method is based on the above-mentioned automatic marking test platform for the concentration of a mine gas sensor. The method includes:

S1: Control the opening of the pressure reducing valve and the pneumatic electromagnetic reversing valve;

S2: Obtain the current flow value detected by the high-precision standard gas meter, and control the multi-channel combined standard gas meter controller based on the current flow value to achieve stable flow control in the channel;

S3: Compare the acquired sensor concentration value of the detected mine gas sensor with the input gas tank concentration value, calculate the error value and synchronize it to the corresponding detected mine gas sensor;

S4: After the standard inspection, close the pressure reducing valve and start the reversing valve.

Further, the step S1 includes: inputting corresponding control instructions through an industrial touch screen computer to control and start the opening and closing of the electromagnetic reversing valve.

Further, the step S2 includes: determining the output signal by the following expression, which is used to quickly adjust the multi-channel combined standard gas meter controller to the corresponding position:

Y=(A*B*C*D/X) ^0.95 ;

Among them, A=0.95, B=1-1.3*(current flow value/1000), C=0.5+(current flow value)*0.02, D=350, X=set flow value-current flow value, calculated The Y value is the corresponding output analog voltage value.

Further, the step S3 includes:

Based on several corresponding sensor concentration values and gas tank concentration values, the values of the coefficients a, b, and c in the error correction expression are determined, and transmitted to the corresponding detected mine gas sensor. The error correction expression is:

Y=aX2+bX+c;

Among them, Y is the concentration value of the gas tank, and X is the concentration value of the sensor.

Further, the step S3 also includes:

Based on the calculated error value and according to the range range, determine whether the verification accuracy is qualified.

The present invention has at least the following beneficial effects:

The present invention realizes the rapid calibration and verification of the mine gas sensor through the interaction, calculation and control of the data processing main control module and the industrial touch screen computer. With the gas sensor, the present invention does not need to use the remote controller necessary for the traditional technology, which saves labor intensity, reduces working hours, and has the advantages of high control and standard detection precision.

Other beneficial effects of the present invention will be described in detail in the specific embodiments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the overall structure of the test bench disclosed in the present invention.

Fig. 2 is a schematic diagram of the test bench disclosed in the present invention.

Among them, 1-gas tank, 2-pressure reducing valve, 3-first meter tube, 4-pneumatic electromagnetic reversing valve, 5-second meter tube, 6-multi-channel gas distributor, 7-third meter tube, 8-multi-channel combined standard gas meter controller, 9-industrial touch screen computer, 10-fourth meter tube, 11-power control module, 12-high precision standard gas meter, 13-data processing main control module, 14-inspected Table installation beam, 15- sensor connecting air pipe, 16- tested mine gas sensor, 17- installation frame, 18- tested sensor pendant, 19- gas tank installation frame.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

The invention discloses a mine-used gas sensor concentration automatic standard detection test platform, which includes a data processing main control module, an industrial touch screen computer, and sequentially connected: a gas tank, a pressure reducing valve, a pneumatic electromagnetic reversing valve, and a multi-channel gas distribution Among them, the multi-channel gas distributor is respectively connected with several channels, which are used to divide the gas in the gas tank into each channel. Devices, high-precision standard gas meters for measuring gas flow, and gas sensors for mines under inspection. The data processing main control module is electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-channel combination standard gas meter controller, and the gas sensor for the mine to be inspected.

Based on the above-mentioned test bench, the present invention also provides more preferred solutions, see Embodiment 1 for details.

Embodiment one

As shown in Figure 1 and Figure 2, the mine gas sensor concentration automatic calibration test bench, the gas in the gas tank 1 is connected to the pneumatic electromagnetic reversing valve 4 through the pressure reducing valve 2 through the first meter tube 3, and the gas tank 1 indicates the gas concentration storage tank. The pressure reducing valve 2 has a pressure indicating structure, which can display the current output pressure of the gas tank 1. The output pressure can be adjusted through the adjustment valve knob of the pressure reducing valve 2, which is convenient for subsequent flow adjustment, limiting pressure output and overpressure alarm. The pneumatic electromagnetic reversing valve 4 is connected to the multi-channel gas distributor 6 through the second meter tube 5. The pneumatic electromagnetic reversing valve 4 is used to open and close the gas tank 1, which can facilitate batch replacement of sensors without frequent manual closing of the pressure reducing valve 2. The multi-channel gas distributor 6 is used to equally distribute the gas in the gas tank 1 to four channels, and the third meter tube 7 is connected to the multi-channel combined standard gas meter controller 8 respectively, and the multi-channel combined standard gas meter controller 8 It is mainly used to adjust the intake angle and adjust the gas flow through proportional distribution, so as to achieve a stable standard 200L/min flow control. In each channel, the multi-channel combined standard gas meter controller 8 is respectively connected to the high-precision standard gas meter 12 through the fourth meter tube 10, and the high-precision standard gas meter 12 measures the actual flow value of the current gas, in order to achieve a stable 200L/min The gas flow rate requires a multi-channel combined standard gas meter controller 8 and a high-precision standard gas meter 12 to realize closed-loop control and adjust the flow rate in real time. Each high-precision standard gas meter 12 is respectively connected to the corresponding detected mine gas sensor 16 through the sensor connection gas pipe 15 . The gas tank 1 is placed in the gas tank installation frame 19, and the gas sensors 16 for mines to be checked are respectively installed on the installation crossbeam 14 of the meter to be checked through the sensor pendant 18 to be checked.

The industrial touch screen computer 9 is installed on the aluminum alloy mounting frame 17 through a rotating cantilever, which can realize multi-angle rotation. Both the power control module 11 and the main data processing control module 13 are installed on the installation frame 17 . The power supply control module 11 contains a switching power supply and a voltage stabilization isolation module, which provide a voltage stabilization source for the system and the data processing main control module 13 .

The data processing main control module 13 mainly includes a data acquisition unit, a protocol conversion unit, a valve pipeline control unit and a core control unit, wherein the data acquisition unit is used to collect the flow data of the high-precision standard gas meter 12; the detected mine gas sensor 16 The current actual measurement value is transmitted to the core control unit through the protocol conversion unit. After internal core closed-loop calculation and processing, the actual analog value is obtained, and then the valve pipeline control unit outputs a standard industrial-grade 4-20MA signal to control the multi-channel combined standard gas. The meter controller 8 is used to adjust the valve angle. The protocol conversion module includes a CAN communication unit and a 485 communication unit, which are used to realize CAN communication and 485 communication mode conversion, and can simultaneously communicate with four mine gas sensors 16 under inspection.

The valve pipeline control unit in the data processing main control module 13 controls the pneumatic electromagnetic reversing valve 4. The technology on the market generally adopts the relay control mode. The relay is easy to generate arc when it operates, and it is not suitable for use in combustible gases such as methane. , and the relay also has a mechanical action life, and the pneumatic electromagnetic reversing valve 4 needs frequent actions during the standard inspection process. In this regard, the valve pipeline control unit in the data processing main control module 13 uses the IO pin of the chip to drive the triode, the triode drives the optocoupler isolation chip, and then drives the thyristor chip through the optocoupler isolation chip to drive the pneumatic electromagnetic reversing valve 4. Advantages There is no fire arc generated during the action, and it is not affected by the mechanical life, the switching frequency is high, and the quality is reliable.

The protocol conversion unit contains four 485 communication units and two CAN isolation units, so that it can automatically identify the detected mining gas sensor that is currently connected to the 485 interface or the CAN interface through hardware transmission data.

The data acquisition unit cooperates with the valve pipeline control unit to control the multi-channel combined standard gas meter controller 8. The data acquisition unit adopts a 16-bit AD conversion chip AD7606, and uses SPI bus high-speed communication with the core CPU to collect the data of the high-precision standard gas meter 12. After processing and core calculation, the corresponding output voltage value is obtained. Since the CPU output voltage is up to 3.3V, and the control signal is 4-20MA, it needs to pass the 4-20MA signal corresponding to the non-inverting amplifier and triode constant current control output to control multiple Road combined standard gas meter controller 8.

The industrial touch-screen computer 9 can communicate with the data processing main control module 13 to display the current flow value of the high-precision standard gas meter 12 and the current actual measured value of the detected mine gas sensor 16. The industrial touch-screen computer is provided with an operation panel for Input the concentration value of the gas tank, and manually click the corresponding button to open/close the pneumatic electromagnetic reversing valve 4, switch the angle of the multi-channel combination standard gas meter controller 8, and input the timing time of gas ventilation during the calibration or verification process. The timing time is The venting time of the detected mine gas sensor 16 is generally 5-10 minutes according to the verification regulations or process confirmation time, and the corresponding calibration or verification button can also be clicked according to the process, so as to realize the detection of multiple channels of the same type according to the preset conditions. The gas sensor 16 for mine inspection performs automatic calibration and verification, automatically collects and saves the calibration process data and other functions. The calibration process can be displayed through the curve of the operation panel, and the calibration data can be saved in the database, which is convenient for browsing and printing.

The overall working process of this embodiment is as follows: after each detected mine gas sensor 16 is connected to the corresponding channel, the test bench is powered on, the appropriate gas pressure value is adjusted through the pressure reducing valve 2, and the industrial touch screen computer 9 is operated to turn on the pneumatic electromagnetic commutation Valve 4, the data processing main control module 13 collects the gas flow value in the test bench, the data processing main control module 13 automatically adjusts the flow of each channel to make it evenly distributed, the data processing main control module 13 automatically counts the ventilation time, and the operator can Input the gas tank concentration value on the industrial touch screen computer 9, which is shown on the signboard of the gas tank 1, check the detection data of four checked mine gas sensors 16, and compare with the input gas tank concentration value, The error value is automatically calculated and communicated synchronously to the detected mine gas sensor 16 to correct the instrument value. After the standard inspection, the gas cylinder can be quickly replaced by closing the pneumatic reversing valve and pressure reducing valve.

The present invention also discloses a method for automatically marking the concentration of a mine gas sensor. The method adopts the above-mentioned automatic test bench for detecting the concentration of a mine gas sensor. The method specifically includes:

S1: Control the opening of the pressure reducing valve and the pneumatic electromagnetic reversing valve;

S2: Obtain the current flow value detected by the high-precision standard gas meter, and control the multi-channel combined standard gas meter controller based on the current flow value to achieve stable flow control in the channel;

S3: Compare the acquired sensor concentration value of the detected mine gas sensor with the input gas tank concentration value, calculate the error value and synchronize it to the corresponding detected mine gas sensor;

S4: After the standard inspection, close the pressure reducing valve and start the reversing valve.

Preferably, the step S1 includes: inputting corresponding control instructions through an industrial touch screen computer to control and start the opening and closing of the electromagnetic reversing valve.

The step S2 includes: determining the output signal by the following expression, which is used to quickly adjust the multi-channel combined standard gas meter controller to the corresponding position:

Y＝(A*B*C*D/X) ^0.95 (1)

Among them, A=0.95, B=1-1.3*(current flow value/1000), C=0.5+(current flow value)*0.02, D=350, X=set flow value-current flow value. For the power function 0.95 in the expression (1), it can be judged according to the X value. When the X value is smaller, the value is closer to 0. If oscillation occurs, the power function 0.95 can be adjusted to make it smaller. The adjustment range is 0.55～ 0.95, the constant D is the adjustable range of 350~850. The final calculated Y value is the corresponding output analog voltage value, which forms a curved trajectory with time.

For example, set the flow rate (the stable gas flow rate expected to be achieved during the test) to 200ML/min, collect the current flow rate as 50ML/min, and determine the parameters as: A=0.95, B=0.935, C=1.5, D=350 , X=150, substitute and get expression (2):

Y＝(0.95*0.935*1.5*350/150) ^0.95 (2)

The calculated voltage Y value is 2.937V, then the output analog value is 2.937V, and there is a high-precision resistor R=250Ω in the circuit. Convert to current value see expression (3):

Y/R＝2.937V/250Ω＝11.748mA (3)

Thereby controlling the multi-channel combined standard gas meter controller of the test bench to turn out the corresponding angle.

Described step S3 comprises:

Based on the sensor concentration value and the gas tank concentration value, determine the values of the coefficients a, b, and c of Y=aX2+bX+c polynomial fitting, and transmit them to the detected mine gas sensor;

The step S3 also includes:

Based on the calculated error value and according to the range range, determine the verification accuracy.

Embodiment two

For the control method adopted in the step S2, it is different from the commonly used PID algorithm, referring to the above expression (1), the Y value finally calculated is a curved track, and the output signal can quickly adjust the multi-channel combined standard gas When the meter controller reaches the corresponding position, run the standard controller first fast and then slow to adjust with high precision, without overshooting and then returning and oscillating adjustment like PID adjustment, saving adjustment time;

For the method adopted in the step S3, the standard concentration value and the concentration value detected by the detected mine gas sensor 16 can be automatically recorded, and after a plurality of detection points are recorded, the following expression (4) polynomial fitting is automatically generated Values of the coefficients a, b, c of :

Y＝aX2+bX+c (4)

Wherein, Y=aX2+bX+c is a quadratic equation of one yuan, and X is the concentration value (sensor concentration value) that the detected mine gas sensor currently detects, and Y is a standard concentration value (gas tank concentration value), so X, Y The values are known, and the values of a, b, and c are reversely deduced, which becomes a ternary linear equation. After at least 3 test record points are substituted, and then eliminated by addition and subtraction, that is, the ternary The linear equation is converted into a binary linear equation, and then converted into a one-dimensional linear equation, so as to obtain the values of a, b, and c and transmit them to the detected mining gas sensor. The detected mining gas sensor uses the values of a, b, and c , correct the current concentration error, and the automatic calibration is successful.

After calibration, the tested mining gas sensor needs to verify whether it meets the accuracy, that is, it is qualified within the accuracy range, and the calculation expression of the verification accuracy is:

A＝(Y-X)/Z*100％ (5)

Among them, Y is the current standard concentration value, X is the current concentration value of the detected mine gas sensor, Z is the maximum value of the input range, and the verification accuracy is automatically calculated. If the calculation accuracy is within the known accuracy range, it is qualified , otherwise it fails. It is also possible to print out the form.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. A mining gas sensor concentration automatic standard detection test bench is characterized in that it includes a data processing main control module, an industrial touch screen computer, and sequentially connected: a gas tank, a pressure reducing valve, a pneumatic electromagnetic reversing valve, a multi-channel Gas distributor, among them, the multi-channel gas distributor is connected with several channels, which are used to divide the gas in the gas tank into each channel. Meter controllers, high-precision standard gas meters for measuring gas flow, and gas sensors for mines to be inspected; The data processing main control module is electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-channel combination standard gas meter controller, and the gas sensor for the mine to be inspected. 2. The gas sensor concentration automatic standard detection test platform according to claim 1, wherein the data processing main control module adopts the chip IO pin to drive the triode, and the triode drives the optocoupler isolation chip, and then drives the optocoupler isolation chip The thyristor chip drives the pneumatic reversing valve; The data processing main control module controls the multi-channel combined standard gas meter controller through the standard industrial level 4-20MA signal. 3. The mine gas sensor concentration automatic standard detection test platform according to claim 1, characterized in that, the data processing main control module is provided with a CAN communication unit and a 485 communication unit for communication connection with the detected mine gas sensor ; The industrial touch screen computer is also connected with a printing device for printing test results. 4. The mine gas sensor concentration automatic standard detection test bench according to claim 1, is characterized in that, also comprises: installation frame, tested sensor pendant, wherein, is provided with on the installation frame: tested meter installation crossbeam and use The gas tank installation frame for placing the gas tank, the detected mine gas sensor is installed on the installation beam of the tested meter through the tested sensor pendant; The data processing main control module and the industrial touch screen computer are respectively installed on the installation frame. 5. the mine gas sensor concentration automatic standard detection test-bed according to claim 1, is characterized in that, this test-bed also comprises: The first meter pipe, the gas pipe is connected to the start electromagnetic reversing valve through the pressure reducing valve through the first meter pipe; The second meter tube, the pneumatic electromagnetic reversing valve is connected to the multi-way gas distributor through the second meter tube; The third meter tube, the multi-channel gas distributor is connected to the multi-channel combined standard gas meter controller through the third meter tube; The fourth meter tube, the multi-channel combined standard gas meter controller is connected to the corresponding high-precision standard gas meter through the fourth meter tube; The sensor is connected to the gas pipe, and the high-precision standard gas meter is connected to the corresponding detected mine gas sensor through the sensor connection gas pipe. 6. An automatic standard detection test method for gas sensor concentration for mines, characterized in that, the method is based on the automatic standard detection test platform for gas sensor concentration for mines according to any one of claims 1 to 5, the method comprising: S1: Control the opening of the pressure reducing valve and the pneumatic electromagnetic reversing valve; S2: Obtain the current flow value detected by the high-precision standard gas meter, and control the multi-channel combined standard gas meter controller based on the current flow value to achieve stable flow control in the channel; S3: Compare the acquired sensor concentration value of the detected mine gas sensor with the input gas tank concentration value, calculate the error value and synchronize it to the corresponding detected mine gas sensor; S4: After the standard inspection, close the pressure reducing valve and start the reversing valve. 7. the mine gas sensor concentration automatic standard detection test method according to claim 6, is characterized in that, described step S1 comprises: Input the corresponding control command through the industrial touch screen computer to control the opening and closing of the electromagnetic reversing valve. 8. The automatic standard detection and testing method of gas sensor concentration for mines according to claim 6, wherein said step S2 comprises: determining the output signal by the following expression, for rapidly adjusting the multi-channel combined standard gas meter controller to the corresponding location: Y＝(A _* B ^{*C*D/X) 0.95 ;} Among them, A=0.95, B=1-1.3*(current flow value/1000), C=0.5+(current flow value)*0.02, D=350, X=set flow value-current flow value, calculated The Y value is the corresponding output analog voltage value. 9. the mine gas sensor concentration automatic standardization test method according to claim 6, is characterized in that, described step S3 comprises: Based on several corresponding sensor concentration values and gas tank concentration values, the values of the coefficients a, b, and c in the error correction expression are determined, and transmitted to the corresponding detected mine gas sensor. The error correction expression is: Y=aX2+bX+c; Among them, Y is the concentration value of the gas tank, and X is the concentration value of the sensor. 10. the mine gas sensor concentration automatic marking test method according to claim 9, is characterized in that, described step S3 also comprises: Based on the calculated error value and according to the range range, determine whether the verification accuracy is qualified.

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