CN112304719A - Pipeline gas sampler for coal mine and gas sampling method - Google Patents
Pipeline gas sampler for coal mine and gas sampling method Download PDFInfo
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- CN112304719A CN112304719A CN202011254529.8A CN202011254529A CN112304719A CN 112304719 A CN112304719 A CN 112304719A CN 202011254529 A CN202011254529 A CN 202011254529A CN 112304719 A CN112304719 A CN 112304719A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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Abstract
The invention belongs to the field of coal mine pipeline gas concentration detection equipment; the invention provides a pipeline gas sampler for a coal mine and a gas sampling method, wherein a miniature gas pump and a control circuit are arranged in a shell, gas sample extraction is carried out through a pressure acquisition circuit, a gas pump control circuit and other functional circuits, compared with the traditional manual air pump, the pipeline gas sampler is convenient to carry, the pressure in the pipeline is monitored and displayed in real time while the gas sample is acquired, secondary exhaust is prevented from being doped with other gases, and the detection result is more accurate.
Description
Technical Field
The invention relates to the technical field of coal mine pipeline gas concentration detection, in particular to a pipeline gas sampler for a coal mine and a gas sampling method.
Background
At present, a manual negative pressure gas extraction cylinder is adopted for collecting and exhausting gas samples in a gas pipeline in a coal mine, when the gas samples are collected, a piston pull rod is pulled, a one-way valve in an air suction end is opened, the gas in the pipeline is sucked into the gas cylinder, then the piston pull rod is pushed forwards and quickly, the one-way valve in an air exhaust end is opened, the gas in the gas cylinder is sent into a gas detector or a sampling bag, the operation is repeated for a plurality of times, the gas can be collected into the gas detector or the sampling bag, the method consumes time and labor, the working efficiency is greatly influenced, the gas samples are easily doped in the process of sending the gas samples into the gas detector, and the measurement result is inaccurate; the existing sampler cannot monitor the air pressure in the pipeline simultaneously when collecting a gas sample.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a pipeline gas sampler for a coal mine and a gas sampling method.
In order to achieve the purpose, the invention provides the following technical scheme:
a gas sampler for a pipeline for a coal mine comprises a shell, an exhaust interface and an air extraction interface of the sampler, wherein a display screen and a film button are arranged on the front surface of the shell; the exhaust interface and the air exhaust interface are positioned at the top of the shell; the control circuit comprises a main controller, an air pump circuit which is connected to the main controller and used for controlling the miniature air pump, and a pressure acquisition circuit which acquires air pressure signals in the pipeline, wherein the air pump control circuit is connected with a first signal output end of the main controller, and the pressure acquisition circuit is connected with a first signal input end of a column controller.
Furthermore, the control circuit also comprises a display circuit, a clock circuit, a key circuit, a power circuit and a data storage circuit which are connected to the main controller, wherein the display circuit and the key circuit are respectively connected with the display screen and the thin film keys.
Furthermore, a second signal output end of the main controller is connected with the display circuit, and a second signal input end of the main controller is connected with the key circuit.
Further, the casing side is equipped with the interface that charges.
Further, a battery box is arranged in the shell.
Further, the outer surface of the shell is provided with an equipment number coating.
Furthermore, the signal input end of the pressure acquisition circuit is connected with a pressure sensor, and the pressure sensor is arranged in the air exhaust interface.
A pipeline gas sampling method for a coal mine is based on the pipeline gas sampler for the coal mine and comprises the following steps:
and 3, after the gas sample is collected, closing the miniature air pump, displaying by a display screen to return to a working main interface, closing the pipeline gas sampler for the coal mine, and disconnecting the exhaust interface and the air extraction interface from the gas detector and the gas pipeline interface respectively for use after the next gas sample is extracted.
Further, the gas component detector is configured on the pipeline gas sampler for coal mines.
In conclusion, the invention has the following beneficial effects:
the sampling chip controls the micro air pump to collect the pipeline gas sample, so that the operation is convenient, the time and the labor are saved, and the working efficiency of gas sampling is further improved; compared with the existing manual air suction type sampler made of stainless steel, the device is lighter and more convenient to carry, the pressure in the pipeline is monitored and displayed in real time through the display screen while the gas sample is collected, the collected gas sample is sent into the gas measuring device in real time through the exhaust joint, the secondary exhaust is prevented from being mixed with other gases, and the detection result is ensured to be more accurate.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a side cross-sectional view of the present invention;
FIG. 3 is a block diagram of the system of the present invention;
FIG. 4 is a power supply circuit diagram of the present invention;
FIG. 5 is a schematic diagram of a control circuit of the micro air pump of the present invention;
FIG. 6 is a schematic diagram of a pressure acquisition circuit of the present invention;
FIG. 7 is a schematic diagram of a display circuit of the present invention;
FIG. 8 is a schematic diagram of a clock circuit of the present invention;
FIG. 9 is a schematic diagram of a data storage circuit of the present invention;
FIG. 10 is a flow chart of a sampling method of the present invention.
In the figure: 1-exhaust interface, 2-air exhaust interface, 3-air pump chamber, 4-display screen, 5-thin film button, 6-battery box, 7-charging interface, 8-shell and 9-miniature air pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 9, the invention discloses a pipeline gas sampler for a coal mine, which comprises a shell 8 of the sampler, an exhaust interface 1 and an air extraction interface 2, wherein the front surface of the shell 8 is provided with a display screen 4 and a film key 5, and the outer surface of the shell 8 is provided with an equipment number coating which marks the equipment number; a battery box 6 is arranged in the shell 8, a micro air pump 9 and a control circuit are arranged in the shell 8, a charging interface 7 is arranged on the side surface of the shell 8, the air pump is charged by a charger, and an air outlet and an air suction port of the micro air pump 9 are respectively connected with the air exhaust interface 1 and the air suction interface 2; the control circuit comprises a main controller and an air pump circuit which is connected with the main controller and is used for controlling the micro air pump, and a pressure acquisition circuit for acquiring gas pressure signals in the pipeline, in the embodiment, the model of a main controller is STM32F103RCT6, the main controller is used as a core controller of the invention to control the working state of a micro air pump 9, extract a gas sample in gas management and send the gas sample into a gas tester through an exhaust interface 1, the air pump control circuit is connected with a first signal output end of the main controller, the pressure acquisition circuit is connected with a first signal input end of the main controller, a pressure sensor is arranged in an exhaust interface 2, and the signal input end of the pressure acquisition circuit is connected with the pressure sensor, the pressure sensor is used for acquiring a pressure signal in the pipeline, transmitting the pressure signal to the main controller through the pressure acquisition circuit and displaying the pressure in the pipeline through the display screen 4, and the model of the pressure sensor is XGZP 6867; the exhaust port 1 and the suction port 2 are located at the top of the housing 8.
The control circuit further comprises a display circuit, a clock circuit, a key circuit, a power circuit and a data storage circuit which are connected to the main controller, the display circuit and the key circuit are respectively connected with the display screen 4 and the film keys 5, a second signal output end of the main controller is connected with the display circuit, and a second signal input end of the main controller is connected with the key circuit.
As shown in the schematic diagram of the power circuit shown in fig. 4, in this embodiment, a nominal 3.7V rechargeable lithium manganate battery is used, the voltage after the power charging is completed is 4.2V, and the voltage passes through a voltage conversion chip, the model number of which is TPS79533, and the voltage of 3.3V is output to supply power to the power supply of the present invention, i.e., VCC3.3 in the diagram, and the input end and the output end of the voltage conversion chip are respectively connected in parallel with a coupling capacitor for filtering, so as to ensure the stability of the output voltage.
FIG. 5 is a schematic diagram of a control circuit of a miniature air pump, which is controlled by a voltage-stabilizing adjustable circuit, and the national standard of a motor allows 10% error in the rotating speed of the motor, so that the invention adopts the voltage-stabilizing adjustable circuit, a gas sampler has flow limitation when extracting a gas sample, the flow is controlled by controlling the flow to make the flow of the extracted gas sample consistent with that of the extracted gas sample, and the flow is controlled by voltage change, so that the invention can conveniently collect the gas sample, and the voltage output VOUT = VREF (1 + R2/R1) + IadJR2; the voltage adjustable chip model LM1117, resistance R1 select adjustable resistance for use, accomplish voltage control flow through the resistance of adjusting resistance R1.
FIG. 6 is a schematic diagram of a pressure acquisition circuit, which performs digital compensation on the offset, sensitivity, temperature drift and nonlinearity of a pressure sensor, and generates a standard voltage signal after calibration and temperature compensation by using the output value VCC3.3 of a power supply circuit as a reference; the pressure sensor is connected with the main processor in an I2C mode, the pressure sensor transmits acquired voltage signals to the main controller through an I2C _ SDA signal line, and the main controller converts the voltage signals into corresponding pressure values through calculation and analysis.
Fig. 7 is a schematic diagram of a display circuit, in this embodiment, an OLED display is selected, a backlight lamp is not required for self-illumination, the thickness is small, the weight is light, the viewing angle range is large, the resolution ratio is high, the driving voltage is low, the power consumption is lower, a 1.54-inch OLED display screen is selected, the OLED display screen is connected with a main controller in a Serial Peripheral Interface (SPI) connection mode, and meanwhile, the main controller transmits collected pressure values, time values and control instructions of a micro air pump to the display screen 4 through an SPI1_ MOSI signal line for display.
Fig. 8 shows a clock circuit for time management according to the present invention, which provides time recording including the time for collecting gas samples and the time for various operations, and the clock uses a PCF8563T clock chip to provide hardware calendar functions in BCD mode, communicates with the host controller using I2C serial bus, and transmits time data to the host controller via I2C1_ SDA data lines.
FIG. 9 is a data storage circuit, realizes the time of sample gas collection of sample gas, the storage of pipeline negative pressure value, and memory chip adopts the model to be FM25V 02A's EEPROM, through SPI interface and main control unit communication, and main control unit transmits the time data and the pressure data of gathering to memory chip through SPI1_ MOSI data line and saves.
As shown in fig. 10, the invention also discloses a method for sampling gas in a coal mine pipeline, which is based on the gas sampler in the coal mine pipeline and comprises the following steps:
And 2, selecting the starting time of the micro air pump 9 and the flow of the extracted gas sample from the starting options of the micro air pump 9 displayed on the working main interface, starting the micro air pump 9 to start to collect the gas sample, detecting the current gas pressure of the pipeline for collecting the gas sample through a pressure sensor positioned in the gas extraction interface 2, and simultaneously displaying the gas pressure in the display screen 4.
And 3, after the gas sample is collected, closing the micro air pump 9, displaying on the display screen 4 to return to the main working interface, closing the gas sampler of the coal mine pipeline, disconnecting the exhaust interface 1 and the air extraction interface 2 from the gas detector and the gas pipeline interface respectively, and using the gas sample after next gas sample extraction.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. The utility model provides a pipeline gas sample thief for coal mine which characterized in that: the sampler comprises a shell (8), an exhaust interface (1) and an air extraction interface (2), wherein the front surface of the shell (8) is provided with a display screen (4) and a membrane key (5), a micro air pump (9) and a control circuit are arranged inside the shell (8), and an exhaust port and an air extraction port of the micro air pump (9) are respectively connected with the exhaust interface (1) and the air extraction interface (2); the exhaust interface (1) and the air exhaust interface (2) are positioned at the top of the shell (8);
the control circuit comprises a main controller, an air pump circuit which is connected to the main controller and used for controlling the miniature air pump, and a pressure acquisition circuit which acquires air pressure signals in the pipeline, wherein the air pump control circuit is connected with a first signal output end of the main controller, and the pressure acquisition circuit is connected with a first signal input end of a column controller.
2. The coal mine pipeline gas sampler of claim 1, wherein: the control circuit further comprises a display circuit, a clock circuit, a key circuit, a power circuit and a data storage circuit which are connected to the main controller, and the display circuit and the key circuit are respectively connected with the display screen (4) and the film keys (5).
3. The coal mine pipeline gas sampler of claim 2, wherein: and a second signal output end of the main controller is connected with the display circuit, and a second signal input end of the main controller is connected with the key circuit.
4. The coal mine pipeline gas sampler of claim 1, wherein: the side surface of the shell (8) is provided with a charging interface (7).
5. The coal mine pipeline gas sampler of claim 4, wherein: a battery box (6) is arranged in the shell (8).
6. A coal mine pipeline gas sampler as claimed in any one of claims 1 to 5 wherein: and an equipment number coating is arranged on the outer surface of the shell (8).
7. The coal mine pipeline gas sampler of claim 1, wherein: the signal input end of the pressure acquisition circuit is connected with a pressure sensor, and the pressure sensor is arranged in the air exhaust interface (2).
8. A coal mine pipeline gas sampling method is based on the coal mine pipeline gas sampler of claim 1, and is characterized in that: the method comprises the following steps:
step 1, an exhaust interface (1) of a pipeline gas sampler for a coal mine is connected with a gas detector, an air exhaust interface (2) is connected with a gas pipeline interface, initialization self-checking is carried out after starting up, whether the pipeline gas sampler is in a charging state or not is judged after the self-checking is finished, a charging interface is displayed on a charging state display screen (4), and the pipeline gas sampler enters a working main interface after charging is finished or a charger is removed; the pipeline gas sampler for the coal mine directly enters a working main interface without being in a charging state;
step 2, selecting the starting time of the micro air pump (9) and the flow of the extracted gas sample from the starting options of the micro air pump (9) displayed on the working main interface, starting the micro air pump (9) to collect the gas sample, and simultaneously displaying the real-time gas pressure in the pipeline for collecting the gas sample in the display screen (4);
and 3, after the gas sample is collected, closing the miniature air pump (9), displaying by the display screen (4) to return to the working main interface, closing the gas sampler of the coal mine pipeline, disconnecting the exhaust interface (1) and the air extraction interface (2) from the gas detector and the gas pipeline interface respectively, and using the gas sample after next air sample extraction.
9. The method for sampling gas in a coal mine pipeline according to claim 8, wherein: the pipeline gas sampler for coal mines is provided with a gas component detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254529.8A CN112304719A (en) | 2020-11-11 | 2020-11-11 | Pipeline gas sampler for coal mine and gas sampling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254529.8A CN112304719A (en) | 2020-11-11 | 2020-11-11 | Pipeline gas sampler for coal mine and gas sampling method |
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| CN112304719A true CN112304719A (en) | 2021-02-02 |
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| CN202011254529.8A Pending CN112304719A (en) | 2020-11-11 | 2020-11-11 | Pipeline gas sampler for coal mine and gas sampling method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216878A (en) * | 2021-12-02 | 2022-03-22 | 山西晋煤集团技术研究院有限责任公司 | Methane telemeter based on tunable laser |
| CN114487473A (en) * | 2021-12-28 | 2022-05-13 | 山西晋煤集团技术研究院有限责任公司 | Non-contact type wind speed measuring device |
| CN114837728A (en) * | 2022-05-10 | 2022-08-02 | 重庆大学 | Disaster prevention and control method and system for closing mine gas leakage |
-
2020
- 2020-11-11 CN CN202011254529.8A patent/CN112304719A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216878A (en) * | 2021-12-02 | 2022-03-22 | 山西晋煤集团技术研究院有限责任公司 | Methane telemeter based on tunable laser |
| CN114487473A (en) * | 2021-12-28 | 2022-05-13 | 山西晋煤集团技术研究院有限责任公司 | Non-contact type wind speed measuring device |
| CN114837728A (en) * | 2022-05-10 | 2022-08-02 | 重庆大学 | Disaster prevention and control method and system for closing mine gas leakage |
| CN114837728B (en) * | 2022-05-10 | 2023-01-10 | 重庆大学 | Disaster prevention and control method and system for closing mine gas leakage |
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