Multi-parameter monitoring device and method for gas in coal mine boreholes

Abstract

This invention discloses a multi-parameter monitoring device for methane in coal mine boreholes, comprising: a clamp-type flow sensor assembly installed on a single-hole extraction branch pipe, a gas sampling valve assembly, and a data acquisition and detection device; the data acquisition and detection device includes a chassis and multiple inlet pipes within the chassis, a primary sensor arrangement pipe, a power module, a pumping pipe, a valve injector, a signal acquisition module, and a main control module; branch solenoid valves are installed on the multiple inlet pipes, which converge and connect to the pumping pipe, and a temperature sensor, a pressure sensor, and a main control solenoid valve are sequentially installed on the pumping pipe; one end of the pumping pipe is connected to the primary sensor arrangement pipe, and the other end is connected to the primary interface of the valve injector, and the other interfaces of the valve injector are connected to a carbon monoxide sensor, a methane sensor, and a roadway gas interface; the invention also discloses a corresponding detection method; it has the advantages of high accuracy, flexible switching, easy disassembly and maintenance, reliable detection, and low cost.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas detection, specifically a multi-parameter monitoring device and method for gas in coal mine boreholes. Background Technology

[0002] In recent years, with the gradual depletion of shallow coal resources, the scale of deep coal mining has been continuously expanding. Numerous scholars and experts, through in-depth research and extensive practical experience, have discovered that deep mining faces severe challenges related to gas hazards. Due to factors such as increased ground stress, reduced coal seam permeability, and complex gas occurrence conditions in deep well environments, the frequency of accidents such as gas outbursts and gas explosions has increased significantly. Improving gas drainage efficiency has become a top priority.

[0003] Currently, underground gas drainage suffers from several shortcomings in parameter monitoring. First, the coverage of intelligent gas parameter monitoring equipment is insufficient, and borehole gas drainage parameters still rely primarily on manual recording. This leads to problems such as delayed information acquisition, low frequency of manual inspections, and human error in recording, making it difficult for technicians to promptly identify abnormal drainage events. Second, existing gas parameter monitoring equipment is mainly used for single-hole detection, such as detecting gas concentration and flow rate in a single borehole. Installation typically requires significant modifications to the pipeline structure. When dealing with hundreds or thousands of boreholes in a working face, single-hole detection methods suffer from large-scale equipment requirements, excessively high economic costs, and extremely complex control procedures, failing to meet the needs of large-scale continuous monitoring and cost reduction for mining companies. Finally, existing gas parameter monitoring equipment needs to be directly connected to the drainage pipeline. Under the long-term influence of dust, water vapor, and other impurities, key sensing components become contaminated and difficult to clean and maintain, resulting in reduced reliability and accuracy, and failing to provide reliable data support for gas drainage operations.

[0004] In existing technologies, some researchers have developed gas parameter monitoring equipment. However, there are still problems such as insufficient consideration of the time required for gas pressure balance in each branch, the impact of residual pressure, pipeline cleaning, or the need for pipeline modification, as well as the safety hazards of connecting the extraction pipeline to the external environment. Summary of the Invention

[0005] In view of the problems or defects in the existing technology, the present invention aims to solve the problems of high parameter detection cost, complex management and control, low reliability and accuracy, and safety hazards in the existing underground gas extraction technology.

[0006] The present invention provides the following solution: a multi-parameter monitoring device for gas in coal mine boreholes, comprising: a flow sensor assembly, a gas sampling pipeline assembly, and a data acquisition and detection device, all mounted on a single-hole extraction branch pipe;

[0007] The gas sampling valve assembly includes a gas sampling pipeline connected to the outlet end of a plurality of single-hole extraction branch gas sampling valves. Each single-hole extraction branch gas sampling valve is provided with a corresponding gas sampling pipeline (including gas sampling pipeline No. 1, gas sampling pipeline No. 2, ..., gas sampling pipeline No. N). The other end of each gas sampling pipeline is connected to an inlet pipeline on the acquisition and detection device.

[0008] The data acquisition and detection device includes a chassis and multiple air inlet pipes, a power supply module, a pumping pipeline, a through-valve injector (e.g., a six-way valve), a signal acquisition module, and a main control module. Each air inlet pipe is equipped with a branch solenoid valve (including solenoid valve No. 1, solenoid valve No. 2, ..., solenoid valve No. N). The multiple air inlet pipes converge and connect to the pumping pipeline. The pumping pipeline is sequentially equipped with a temperature sensor, a pressure sensor, a main control solenoid valve, and an air pump. The other end of the pumping pipeline is connected to the first interface of the through-valve injector. The second, third, and fourth ports of the valve injector are connected to the exhaust port of the chassis, the methane sensor, and the carbon monoxide sensor, respectively; the fifth and sixth ports of the valve injector are connected to the first and second gas path interfaces on the chassis, respectively; the signal acquisition modules are all connected to the clamp-type flow sensor assembly, temperature sensor, pressure sensor, methane sensor, and carbon monoxide sensor via wired or wireless means; the main control module is connected to the signal acquisition module and the solenoid valve control module via wired or wireless means.

[0009] Furthermore, each gas sampling pipeline is equipped with a water dust filter.

[0010] Furthermore, it also includes a communication module, which includes a wireless communication module and a wired communication module.

[0011] Furthermore, it also includes a display module, which is connected to the main control module.

[0012] Furthermore, the flow sensor assembly includes clamp-type flow sensors disposed on multiple single-hole extraction branch pipes; at least one clamp-type flow sensor is disposed on each single-hole extraction branch pipe (including single-hole extraction branch pipe No. 1, single-hole extraction branch pipe No. 2, ..., single-hole extraction branch pipe No. N).

[0013] As another aspect of the present invention, a monitoring method for a multi-parameter monitoring device for gas in coal mine boreholes is also disclosed, including a method for controlling multiple solenoid valves. The specific method is as follows: the solenoid valve control module controls the opening and closing of solenoid valves No. 1, No. 2, ..., No. N, and the main control solenoid valve; when any one of the solenoid valves No. 1, No. 2, ..., No. N is open, the others are closed, and gas in one branch pipe is detected each time; when any one of the solenoid valves No. 1, No. 2, ..., No. N is open, the main control solenoid valve opens simultaneously, and the gas pump pumps the gas in the corresponding single-hole extraction branch pipe into the detection gas path; after sufficient gas exchange and washing away the residue from the previous detection, the main control solenoid valve closes, and the gas temperature and pressure are measured under conditions without pump interference; after completing the temperature and pressure measurements, the main control solenoid valve opens for subsequent methane and carbon monoxide concentration measurements; when all the solenoid valves No. 1, No. 2, ..., No. N are closed, the main control solenoid valve closes simultaneously.

[0014] Furthermore, the solenoid valve control module controls the opening and closing of solenoid valves No. 1, No. 2, ..., N through high and low voltage levels. The specific steps are as follows:

[0015] Step 1: The master control solenoid valve remains at a high level for a set period of time to allow for sufficient gas exchange and to wash away any residue from the previous test.

[0016] Step 2: After the gas washing is completed, set the main control solenoid valve to low level and maintain it for a set period of time, and measure the gas temperature and pressure under conditions without gas pump interference.

[0017] Step 3: After completing the temperature and pressure measurements, the main control solenoid valve is set to high level again and maintained for a period of time to perform subsequent methane and carbon monoxide concentration measurements.

[0018] Step 4: After completing the gas concentration test, set the No. 1 solenoid valve and the main control solenoid valve to low level. At this time, all solenoid valves are in the closed state.

[0019] Subsequently, the solenoid valves corresponding to the single-hole extraction branch pipe under test and the main control solenoid valve repeat steps one to four above to cyclically detect the parameters of each extraction branch pipe.

[0020] Furthermore, it also includes a borehole gas concentration detection method, the specific method of which is as follows: connect the No. 1 and No. 3 ports, the No. 2 and No. 4 ports, and the No. 5 and No. 6 ports on the through valve sampler; after completing the temperature and pressure measurements, the main control solenoid valve is opened, and the sampled gas passes through the No. 1 and No. 3 ports in turn, enters the methane sensor and carbon monoxide sensor in turn, and then passes through the No. 4 and No. 2 ports to the exhaust port and merges into the borehole gas manifold; the relevant passages of the No. 5 and No. 6 ports contain roadway gas.

[0021] Furthermore, it also includes a gas path purging and roadway gas concentration detection method. The specific method is as follows: the No. 1 interface is internally connected to the No. 2 interface, the No. 5 interface is internally connected to the No. 3 interface, and the No. 6 interface is internally connected to the No. 4 interface; the sampled gas passes through the No. 1 and No. 2 interfaces to the exhaust port and merges into the borehole gas manifold; since the roadway gas is at normal pressure and the sampled gas is at negative pressure, under the action of pressure difference, the roadway gas enters the methane sensor, carbon monoxide sensor and interconnected gas path through the No. 5 and No. 6 interfaces, realizing gas path purging and cleaning, as well as detection of methane and carbon monoxide concentrations in the roadway gas.

[0022] Furthermore, it also includes a method for determining the normal parameter range within the extraction branch pipe, specifically including the following steps:

[0023] Step 1: Data Collection and Integration

[0024] Multiple extraction branches are monitored, and parameter data for each branch at different time points are collected. These parameters include, but are not limited to, gas concentration, temperature, and pressure. The parameter data is acquired through devices such as flow sensors, temperature sensors, and pressure sensors, and stored in the data acquisition system.

[0025] Step 2: Data Preprocessing

[0026] The collected parameter data undergoes preprocessing, including data cleaning, outlier removal, and data normalization, to ensure data accuracy and consistency. This data preprocessing step is implemented through a data processing module.

[0027] Step 3: Statistical Analysis

[0028] Statistical analysis is performed on the preprocessed parameter data to calculate the statistical characteristics of each parameter, including the mean μ, median, standard deviation σ, maximum value, and minimum value.

[0029] Step 4: Determine the normal parameter range

[0030] Based on the results of statistical analysis, the normal range for each parameter is determined. The normal range can be calculated using the following formula:

[0031] Normal range = [μ-k1·σ-k2·MAD, μ+k1·σ+k2·MAD]

[0032] Where: μ represents the average value of the parameter,

[0033] σ represents the standard deviation of the parameter.

[0034] MAD represents the median absolute deviation of the parameter.

[0035] k1 and k2 are constants to cover approximately 95% of the data.

[0036] Step 5: Environmental Factor Correction

[0037] Since environmental factors (such as temperature and humidity) may affect the normal range of parameters, an environmental correction term E is introduced to adjust the normal range:

[0038] Corrected normal range = [μ-k1·σ-k2·MAD-E,μ+k1·σ+k2·MAD+E]

[0039] E is calculated based on environmental monitoring data.

[0040] Step Six: Range Verification

[0041] The accuracy and reliability of the determined normal parameter range are verified through additional experiments. The verification steps include comparing the new parameter data with the normal range to check if it falls within the range, and analyzing data points that exceed the range to determine if the normal range needs adjustment.

[0042] Step 7: Range Adjustment

[0043] Based on the verification results, the normal parameter range is adjusted to adapt to different operating conditions or environmental changes. The adjustment steps include expanding or narrowing the normal range and updating statistical characteristic parameters.

[0044] Step 8: Application and Continuous Optimization

[0045] The finalized normal parameter range is applied to the pipeline monitoring system for real-time monitoring and anomaly detection. The application steps include setting alarm thresholds for the monitoring system and triggering alarms when parameters exceed the normal range; continuously optimizing the method for determining the normal parameter range and the performance of the monitoring system based on actual monitoring results and system operation; this allows for a more accurate determination of the normal parameter range for gas within the pipeline, providing a scientific basis for the safe operation and maintenance of the pipeline.

[0046] The beneficial effects and features of this invention are:

[0047] (1) The coal mine borehole gas multi-parameter monitoring device of the present invention connects a multi-hole parallel gas comprehensive parameter monitoring device to the existing gas valve interface of the extraction branch pipe, which can effectively avoid the high cost of large-scale deployment of single-hole gas parameter monitoring equipment and modification of existing extraction pipelines.

[0048] (2) The coal mine borehole gas multi-parameter monitoring device of the present invention can use a set of sensors to cyclically measure the temperature, negative pressure, methane concentration and carbon monoxide content of gas extraction in multiple boreholes by controlling the opening and closing of different solenoid valves. This helps to monitor key indicators of gas extraction in multiple boreholes in real time and greatly reduces monitoring costs.

[0049] (3) The coal mine borehole gas multi-parameter monitoring device of the present invention, a multi-hole parallel gas comprehensive parameter detection device, collects gas temperature, negative pressure, methane and carbon monoxide through the existing gas sampling valves of each branch pipe. The integrated clamp-type flow meter is clamped on the branch pipe for non-contact flow measurement, which does not require modification of the pipeline structure, greatly reducing the installation difficulty and cost, and avoiding the safety problems and construction delays that may be caused by modifying the extraction pipeline. At the same time, the present invention is flexible to disassemble, convenient to maintain, and can be reused, further improving the practicality and reliability of the equipment, saving coal mining enterprises a lot of manpower, material resources and time costs.

[0050] (4) The coal mine borehole gas multi-parameter monitoring device of the present invention adopts a valve-controlled sampler structure. By switching between different working modes, it can use the atmospheric pressure gas in the roadway to backflush and clean the dust and residual gas that may exist in the gas concentration detection gas path, thereby improving the reliability and accuracy of detection and effectively avoiding the safety hazards caused by the connection between the negative pressure environment and the atmospheric environment. In addition, this method can also monitor the concentration of methane and carbon monoxide in the roadway by switching the valve-controlled sampler, which is conducive to safe mining. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the installation position according to a preferred embodiment of the present invention.

[0052] Figure 2 This is a schematic diagram of the system composition of a preferred embodiment of the present invention.

[0053] Figure 3 This is a schematic diagram of the electromagnetic valve control level according to a preferred embodiment of the present invention.

[0054] Figure 4 This is a schematic diagram illustrating the principle of the borehole gas concentration detection mode in a preferred embodiment of the present invention.

[0055] Figure 5 This is a schematic diagram illustrating the principle of the gas path purging and roadway gas concentration detection mode in a preferred embodiment of the present invention.

[0056] The labels in the diagram represent: 1-Clamp-type flow sensor #1, 2-Clamp-type flow sensor #2, 3-Clamp-type flow sensor #N, 4-Water dust filter #1, 5-Water dust filter #2, 6-Water dust filter #N, 7-Solenoid valve #1, 8-Solenoid valve #2, 9-Solenoid valve #N, 10-Master control solenoid valve, 11-Solenoid valve control module, 12-Temperature sensor, 13-Pressure sensor, 14-Air pump, 15-Plugin, 15-Port valve, 15-1-Interface #1, 15-2-Interface #2, 15-3-Interface #3, 15-4-Interface #4, 15-5-Interface #5, 15-6-Interface #6, 15-7-Operating mode switching knob, 16-Methane sensor, 17-Carbon monoxide sensor, 18-Signal acquisition module, 19-Main control module, 20-Display module, 20-1- Display screen, 21-Wireless communication module, 22-Wired communication module, 23-Power supply module, 24-Chassis, 24-1-Chassis No. 1 air inlet, 24-2-Chassis No. 2 air inlet, 24-3-Chassis No. N air inlet, 24-4-Flow sensor signal interface, 24-5-Chassis air outlet, 24-6-No. 1 tunnel gas path interface, 24-7-No. 2 tunnel gas path interface, 25-No. 1 single-hole extraction. Branch pipe, 25-1-Gas valve for single-hole extraction branch pipe No. 1, 26-Gas valve for single-hole extraction branch pipe No. 2, 26-1-Gas valve for single-hole extraction branch pipe No. 2, 27-Gas valve for single-hole extraction branch pipe No. N, 27-1-Gas valve for single-hole extraction branch pipe No. N, 28-Gas sampling pipeline No. 1, 29-Gas sampling pipeline No. 2, 30-Gas sampling pipeline No. N, 31-Exhaust pipeline, 32-Breakhole gas manifold, 33-Pumping pipeline;

[0057] Note: In the above material, N is an integer greater than or equal to 3. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Please refer to Figure 1The embodiments of the present invention relate to a multi-hole parallel gas comprehensive parameter monitoring device, including a first clamp-type flow sensor 1, a second clamp-type flow sensor 2, ..., Nth clamp-type flow sensor 3, a first gas sampling pipeline 28, a second gas sampling pipeline 29, ..., Nth gas sampling pipeline 30, a first water dust filter 4, a second water dust filter 5, ..., Nth water dust filter 6, a multi-hole parallel gas comprehensive parameter monitoring host chassis 24, an exhaust pipeline 31, and its internal hardware and software.

[0060] The first clamp-type flow sensor 1 is clamped onto the first single-hole extraction branch pipe 25, the second clamp-type flow sensor 2 is clamped onto the second single-hole extraction branch pipe 26, and the Nth clamp-type flow sensor 3 is clamped onto the Nth single-hole extraction branch pipe 27, providing non-contact detection of gas flow in the branch pipes. The signal output terminals of the first clamp-type flow sensor 1, the second clamp-type flow sensor 2, and the Nth clamp-type flow sensor 3 are connected to the flow sensor signal interface 24-4 on the chassis 24.

[0061] One end of the No. 1 gas sampling pipeline 28 is connected to the No. 1 single-hole extraction branch pipe gas intake valve 25-1, and the other end is connected to the No. 1 water and dust filter 4. One end of the No. 2 gas sampling pipeline 29 is connected to the No. 2 single-hole extraction branch pipe gas intake valve 26-1, and the other end is connected to the No. 2 water and dust filter 5. One end of the No. N gas sampling pipeline 30 is connected to the No. N single-hole extraction branch pipe gas intake valve 27-1, and the other end is connected to the No. N water and dust filter 6 (the above water and dust filter includes a water filter and a dust filter).

[0062] The No. 1 water-dust filter 4 is connected to the No. 1 air inlet 24-1 of the chassis, the No. 2 water-dust filter 5 is connected to the No. 2 air inlet 24-2 of the chassis, and the No. N water-dust filter 6 is connected to the No. N air inlet 24-3 of the chassis. The sampled gas is tested for temperature, negative pressure, methane concentration, and carbon monoxide concentration in the multi-hole parallel gas comprehensive parameter monitoring host, and the final test results are displayed on the display screen 20-1. After testing, the gas enters the borehole gas manifold 32 through the exhaust pipe 21 via the exhaust port 24-5 of the chassis.

[0063] Please refer to Figure 2 Inside the multi-hole parallel gas integrated parameter monitoring host box 24 shown, one end of the No. 1 solenoid valve 7 is connected to the No. 1 air inlet 24-1 of the box, controlling the gas inlet and outlet from the No. 1 single-hole extraction branch pipe 25; one end of the No. 2 solenoid valve 8 is connected to the No. 2 air inlet 24-2 of the box, controlling the gas inlet and outlet from the No. 2 single-hole extraction branch pipe 26; one end of the N solenoid valve 9 is connected to the N air inlet 24-3 of the box, controlling the gas inlet and outlet from the N single-hole extraction branch pipe 27.

[0064] The outlets of solenoid valve 7, solenoid valve 8, and solenoid valve 9 converge and are connected to temperature sensor 12 and pressure sensor 13 respectively. The outlet of pressure sensor 13 is connected to the master control solenoid valve 10. The solenoid valve control module 11 controls the opening and closing of the master control solenoid valve 10.

[0065] Please refer to Figure 3 The solenoid valve control module 11 controls the opening and closing of solenoid valves 7 (number 1), 8 (number 2), ..., and 9 (number N). When any one of these solenoid valves is open, the others are closed, and gas in one branch pipe is detected each time. When any one of these solenoid valves is open, the main control solenoid valve 10 opens simultaneously, and the gas pump 14 pumps the gas from the corresponding single-hole extraction branch pipe into the detection gas path. After sufficient gas exchange and washing away the residue from the previous detection, the main control solenoid valve 10 closes, and the gas temperature and pressure are measured under pump-free conditions. After the temperature and pressure measurements are completed, the main control solenoid valve 10 opens again for subsequent methane and carbon monoxide concentration measurements. When all solenoid valves are closed, the fourth solenoid valve 10 closes simultaneously.

[0066] On the other hand, the solenoid valve control module 11 controls the opening and closing of solenoid valves 7, 8, ..., 9, and the main control solenoid valve 10. When solenoid valves 7, 8, ..., 9, and the main control solenoid valve 10 are at a high level, the solenoid valves open; when solenoid valves 7, 8, ..., 9, and the main control solenoid valve 10 are at a low level, the solenoid valves close. When solenoid valve 7 is at a high level, the main control solenoid valve 10 is simultaneously at a high level, while solenoid valves 8 and 9 are at a low level. The air pump 14 pumps the gas in the single-hole extraction branch pipe 25 into the detection gas path for extraction parameter detection. The specific steps are as follows:

[0067] Step 1: The master control solenoid valve 10 remains at a high level for a set period of time to allow for sufficient gas exchange and to wash away any residue from the previous test.

[0068] Step 2: After the gas washing is completed, the main control solenoid valve 10 is set to low level and maintained for a set period of time. Under conditions without gas pump interference, the gas temperature and pressure are measured.

[0069] Step 3: After completing the temperature and pressure measurements, the main control solenoid valve 10 is set to high level again and maintained for a set period of time to perform subsequent methane and carbon monoxide concentration measurements.

[0070] Step 4: After completing the gas concentration test, set solenoid valve 7 (number 1) and main control solenoid valve 10 to low level. At this time, all solenoid valves are in the closed state.

[0071] Subsequently, the solenoid valves corresponding to the single-hole extraction branch pipe under test and the main control solenoid valve 10 repeat steps one to four above to cyclically detect the parameters of each extraction branch pipe.

[0072] Those skilled in the art should understand that Figure 3 The valve control levels and timing shown are for illustrative purposes only. Actual control methods can be set appropriately based on the solenoid valve's operating mode, sensor detection time, etc.

[0073] Those skilled in the art should understand that the number of extraction branch pipes, flow sensors, gas sampling gas paths, water and dust filters, and solenoid valves in the specific embodiments described herein are merely examples, and the actual number may be increased or decreased depending on equipment expansion and communication capabilities, on-site deployment environment, etc.

[0074] Please refer to Figure 2 As shown, the sampled gas is sent into the through-valve sampler 15 via the gas pump 14. Interface 15-1 connects to the outlet of the gas pump 14; interface 15-2 connects to the exhaust port 24-5 of the chassis; interface 15-3 connects sequentially to the methane sensor 16 and the carbon monoxide sensor 17; the outlet of the carbon monoxide sensor 17 is connected to interface 15-4; and interfaces 15-5 and 15-6 connect to interface 24-6 (chassis to tunnel) and interface 24-7 (chassis to tunnel), respectively.

[0075] Specifically, the power supply module 23 is connected to the main control module 19, the solenoid valve control module 11, the first solenoid valve 7, the second solenoid valve 8, the third solenoid valve 9, the main control solenoid valve 10, the temperature sensor 12, the pressure sensor 13, the air pump 14, the methane sensor 16, and the carbon monoxide sensor 17 to provide power.

[0076] The main control module 19 is connected to the solenoid valve control module 11, the signal acquisition module 18, the display module 20, the wireless communication module 21, and the wired communication module 22 to realize functions such as clock unification, signal transmission and reception, result display, and external communication.

[0077] The main control module 19 can control the flow sensor, temperature sensor 12, pressure sensor 13, methane sensor 16 and carbon monoxide sensor 17 to switch on and off, enabling real-time or timed detection.

[0078] The wireless communication module 21 can communicate via methods including but not limited to Wi-Fi, LoRa, etc., and can upload monitoring results to higher-level devices, such as underground signal acquisition substations and surface monitoring platforms. The specific implementation method is set according to the mine environment and surface requirements.

[0079] The wired communication module 21 can communicate via methods including but not limited to RS485, CAN, and optical fiber, and can upload monitoring results to higher-level devices, such as underground signal acquisition substations and surface monitoring platforms. The specific implementation method is set according to the mine environment and surface requirements.

[0080] The signal acquisition module 18 is connected to the signal interfaces of the flow sensor 24-4, temperature sensor 12, pressure sensor 13, methane sensor 16, and carbon monoxide sensor 17 to acquire flow rate, temperature, pressure, methane concentration, and carbon monoxide concentration.

[0081] As another implementation, oxygen sensors, carbon dioxide sensors, and other devices can be added to the gas path where the methane sensor 16 and the carbon monoxide sensor 17 are located. These modifications, changes, or substitutions do not depart from the essence of this method and should be covered within the protection scope of this invention.

[0082] Please refer to Figure 1 The chassis 24 is equipped with a valve injector working mode switching knob 15-7, which enables borehole gas concentration detection, gas path purging and roadway gas concentration detection by switching the working mode.

[0083] Please refer to Figure 4 When the valve-operated sampler operates in borehole gas concentration detection mode, interfaces 15-1 and 35-3 are internally connected, interfaces 15-2 and 45-4 are internally connected, and interfaces 15-5 and 65-6 are internally connected. The sampled gas passes through interfaces 15-1 and 35-3, then enters the methane sensor 16 and carbon monoxide sensor 17, and then through interfaces 45-4 and 25-2 to the exhaust port 24-5, converging into the borehole gas manifold 32. The pathways for interfaces 5-5 and 6-6 contain roadway gas.

[0084] Please refer to Figure 5 When the valve sampler operates in gas path purging and roadway gas concentration detection mode, interfaces 15-1 and 15-2 are internally connected, interfaces 15-5 and 15-3 are internally connected, and interfaces 15-6 and 15-4 are internally connected. The sampled gas passes through interfaces 15-1 and 15-2 to exhaust port 24-5, where it merges into the borehole gas manifold 32. Since the roadway gas is at atmospheric pressure and the sampled gas is at negative pressure, under the pressure difference, the roadway gas enters the methane sensor 16, carbon monoxide sensor 17, and the interconnecting gas path through interfaces 15-5 and 15-6, achieving gas path purging and detection of methane and carbon monoxide concentrations in the roadway gas.

[0085] After the multi-hole parallel gas comprehensive parameter monitoring device is installed, turning on the instrument and opening the gas intake valves of each extraction branch pipe can realize comprehensive monitoring of gas flow, temperature, pressure, methane, and carbon monoxide.

[0086] In some other embodiments, the present invention also relates to an explosion-proof structural design for a monitoring device. This design includes a protective outer shell made of pressure-resistant steel plate, which has sufficient strength to withstand the maximum pressure generated by an internal gas explosion without rupturing. Inside the shell, multiple isolation plates made of high-temperature resistant material are installed, dividing the internal space into multiple compartments. Each compartment houses corresponding components of a multi-parameter gas monitoring device for coal mine boreholes. In the event of a gas explosion, the isolation plates effectively limit the propagation of the blast wave and flames, protecting other unaffected compartments and allowing them to continue operating normally. Furthermore, a safety valve is installed on the shell; when the internal pressure exceeds a preset value, the safety valve automatically opens to release the pressure, further reducing the risk of explosion. This explosion-proof structural design ensures the safety and reliability of the monitoring device in high-risk environments such as coal mines, extends the equipment's service life, and protects the lives of miners.

[0087] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-parameter monitoring device for gas in coal mine boreholes, characterized in that, include: Flow sensor assembly, gas sampling valve assembly and data acquisition and detection device installed on single-hole extraction branch pipe; The gas sampling pipeline assembly includes a gas sampling pipeline connected to the outlet end of a plurality of single-hole extraction branch gas sampling valves. Each single-hole extraction branch gas sampling valve is provided with a corresponding gas sampling pipeline, and the other end of each gas sampling pipeline is connected to an inlet pipeline on the acquisition and detection device. The acquisition and detection device includes a chassis (24) and multiple air inlet pipes, a power supply module (23) for power supply, a pumping pipe (33), a valve injector (15), a signal acquisition module, and a main control module. Each air inlet pipe is equipped with a branch solenoid valve. After multiple air inlet pipes converge, they are connected to the pumping pipe (33). The pumping pipe (33) is equipped with a temperature sensor (12), a pressure sensor (13), a main control solenoid valve (10), and an air pump (14) in sequence. The other end of the pumping pipe (33) is connected to the first interface (15-1) of the valve injector (15). The second interface (15-2) and the third interface (15-3) of the valve injector (15) are also connected to the main control module. 5-3) and No. 4 interface (15-4) are respectively connected to the exhaust port (24-5) of the chassis, the methane sensor (16) and the carbon monoxide sensor (17); the No. 5 interface (15-5) and No. 6 interface (15-6) of the valve injector (15) are respectively connected to the No. 1 roadway gas path interface (24-6) and the No. 2 roadway gas path interface (24-7) on the chassis (24); the signal acquisition module (18) is connected to the clamp-type flow sensor assembly, temperature sensor, pressure sensor, methane sensor and carbon monoxide sensor by wired or wireless means; the main control module is connected to the signal acquisition module (18) and the solenoid valve control module (11) by wired or wireless means.

2. The multi-parameter monitoring device for gas in coal mine boreholes according to claim 1, characterized in that, Each gas sampling pipeline is equipped with a water dust filter.

3. The multi-parameter monitoring device for gas in coal mine boreholes according to claim 1, characterized in that, It also includes a communication module, which includes a wireless communication module (21) and a wired communication module (22).

4. The multi-parameter monitoring device for gas in coal mine boreholes according to claim 1, characterized in that, It also includes a display module (20), which is connected to the main control module (19).

5. The multi-parameter monitoring device for gas in coal mine boreholes according to claim 1, characterized in that, The flow sensor assembly includes clamp-type flow sensors installed on multiple single-hole extraction branch pipes; at least one clamp-type flow sensor is installed on each single-hole extraction branch pipe.

6. The monitoring method of the multi-parameter monitoring device for gas in coal mine boreholes according to claim 1, characterized in that, The method includes control of multiple solenoid valves, specifically as follows: The solenoid valve control module (11) controls the opening and closing of solenoid valve 1 (7), solenoid valve 2 (8), ..., solenoid valve N (9), and the main control solenoid valve (10); when any one of solenoid valve 1 (7), solenoid valve 2 (8), ..., solenoid valve N (9) is open, the other ones are closed, and the gas in one branch pipe is detected each time; when any one of solenoid valve 1 (7), solenoid valve 2 (8), ..., solenoid valve N (9) is open At the same time, the main control solenoid valve (10) opens synchronously, and the gas pump (14) pumps the gas in the corresponding single-hole extraction branch into the detection gas path; after sufficient gas exchange and washing away the residue from the previous detection, the main control solenoid valve (10) closes, and the gas temperature and pressure are measured under conditions without pump interference; after the temperature and pressure measurement is completed, the main control solenoid valve (10) opens, and subsequent methane and carbon monoxide concentration measurements are performed; when the first solenoid valve (7), the second solenoid valve (8), ..., the Nth solenoid valve (9) are all closed, the main control solenoid valve (10) closes synchronously.

7. The monitoring method of the multi-parameter monitoring device for gas in coal mine boreholes according to claim 6, characterized in that, The solenoid valve control module (11) controls the opening and closing of solenoid valves 1 (7), 2 (8), ..., N (9) by adjusting their voltage levels. The specific steps are as follows: Step 1: The master control solenoid valve (10) remains at a high level for a set period of time to allow for sufficient gas exchange and to wash away any residue from the previous test. Step 2: After the gas washing is completed, the main control solenoid valve (10) is set to low level and kept for a set period of time. Under the condition of no gas pump interference, the gas temperature and pressure are measured. Step 3: After completing the temperature and pressure measurements, the main control solenoid valve (10) is set to high level again and maintained for a set period of time to perform subsequent methane and carbon monoxide concentration measurements; Step 4: After completing the gas concentration test, set the No. 1 solenoid valve (7) and the main control solenoid valve (10) to low level. At this time, all solenoid valves are in the closed state. Subsequently, the solenoid valves corresponding to the single-hole extraction branch pipe under test and the main control solenoid valve (10) repeat the above steps one to four to cyclically detect the parameters of each extraction branch pipe.

8. The monitoring method of the multi-parameter monitoring device for gas in coal mine boreholes according to claim 6, characterized in that, It also includes a borehole gas concentration detection method, the specific method is as follows: Connect the No. 1 interface (15-1) and No. 3 interface (15-3) on the valve sampler (15), connect the No. 2 interface (15-2) and No. 4 interface (15-4) internally, and connect the No. 5 interface (15-5) and No. 6 interface (15-6) internally; after completing the temperature and pressure measurement, the main control solenoid valve (10) is opened, and the sampled gas passes through the No. 1 interface (15-1) and No. 3 interface (15-3) in sequence, enters the methane sensor (16) and carbon monoxide sensor (17) in sequence, and then passes through the No. 4 interface (15-4) and No. 2 interface (15-2) to the exhaust port (24-5) and merges into the borehole gas manifold (32); the relevant passages of the No. 5 interface (15-5) and No. 6 interface (15-6) are roadway gas.

9. The monitoring method of the multi-parameter monitoring device for gas in coal mine boreholes according to claim 6, characterized in that, It also includes a gas path purging and roadway gas concentration detection method. The specific method is as follows: the No. 1 interface (15-1) and the No. 2 interface (15-2) are internally connected, the No. 5 interface (15-5) and the No. 3 interface (15-3) are internally connected, and the No. 6 interface (15-6) and the No. 4 interface (15-4) are internally connected; the sampled gas passes through the No. 1 interface (15-1) and the No. 2 interface (15-2) to the exhaust port (24-5) and flows into the borehole gas manifold (32); since the roadway gas is at normal pressure and the sampled gas is at negative pressure, under the action of pressure difference, the roadway gas enters the methane sensor (16), the carbon monoxide sensor (17) and the interconnected gas path through the No. 5 interface (15-5) and the No. 6 interface (15-6) to realize gas path purging and cleaning, as well as methane and carbon monoxide concentration detection in the roadway gas.

10. The monitoring method of the multi-parameter monitoring device for gas in coal mine boreholes according to any one of claims 6-8, characterized in that, It also includes a method for determining the normal parameter range within the extraction branch pipe, specifically including the following steps: Step 1: Data Collection and Integration Multiple extraction branches are monitored, and parameter data of each branch at different time points are collected. The parameters include, but are not limited to, temperature and carbon monoxide. The parameter data are acquired by temperature sensors and carbon monoxide sensors and stored in the data acquisition system. Step 2: Data Preprocessing The collected parameter data is preprocessed, including data cleaning, outlier removal, and data normalization, to ensure the accuracy and consistency of the data. The data preprocessing step is implemented through the data processing module; Step 3: Statistical Analysis Perform statistical analysis on the preprocessed parameter data, and calculate the statistical characteristics of each parameter, including the mean μ, median, standard deviation σ, maximum and minimum values; Step 4: Determine the normal parameter range Based on the results of statistical analysis, the normal range for each parameter is determined; the normal range can be calculated using the following formula: Where: μ represents the average value of the parameter, σ represents the standard deviation of the parameter. MAD represents the median absolute deviation of the parameter. k1 and k2 are constants to cover at least 95% of the data; Step 5: Environmental Factor Correction Considering the impact of environmental factors on the normal range of parameters, an environmental correction term E is introduced to adjust the normal range: E is calculated based on environmental monitoring data; Step Six: Range Verification The accuracy and reliability of the determined normal parameter range are verified through additional experiments; the verification steps include comparing the new parameter data with the normal range to check whether it is within the range, and analyzing data points that are outside the range to determine whether the normal range needs to be adjusted. Step 7: Range Adjustment Based on the verification results, the normal parameter range is adjusted to adapt to different operating conditions or environmental changes; the adjustment steps include expanding or narrowing the normal range and updating the statistical characteristic parameters. Step 8: Application and Continuous Optimization The finalized normal parameter range is applied to the pipeline monitoring system for real-time monitoring and anomaly detection. The application steps include setting alarm thresholds for the monitoring system and triggering alarms when parameters exceed the normal range. Based on actual monitoring results and system operation, the method for determining the normal parameter range and the performance of the monitoring system are continuously optimized.

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