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

Abstract

The invention discloses a multi-parameter monitoring device for gas in a coal mine hole. The multi-parameter monitoring device comprises a caliper type flow sensor assembly arranged on a single-hole extraction branch pipe, a gas taking valve sampling pipeline assembly and a collecting and detecting device. The acquisition and detection device comprises a case as well as a plurality of air inlet pipelines, a first sensor arrangement pipeline, a power supply module, a pumping pipeline, a through valve sample injector, a signal acquisition module and a main control module which are arranged in the case; branch electromagnetic valves are arranged on the multiple air inlet pipelines, the branch electromagnetic valves are communicated with the pumping pipeline after being converged, and a temperature sensor, a pressure sensor and a master control electromagnetic valve are sequentially arranged on the pumping pipeline; one end of the pumping pipeline is communicated with the first sensor arrangement pipeline, the other end of the pumping pipeline is communicated with a first connector of the through valve sample injector, and other connectors of the through valve sample injector are connected with a carbon monoxide sensor, a methane sensor and a roadway gas path connector; the invention further discloses a corresponding detection method. The device has the advantages of high precision, flexible switching, convenient disassembly, convenient maintenance, reliable detection and low cost.

Description

Technical Field

[0001] The invention relates to the field of coal mine gas detection, and in particular to a multi-parameter monitoring device and method for gas in a coal mine hole. Background Art

[0002] In recent years, with the gradual reduction of shallow coal resources, the scale of deep-well coal mining has continued to expand. After in-depth research and extensive practice, many scholars and experts have found that deep-well mining faces severe challenges of gas disasters. Due to factors such as increased ground stress in deep-well environments, reduced coal seam permeability, and complex gas storage conditions, the frequency of accidents such as gas outbursts and gas explosions has increased significantly. Improving the effect of gas extraction has become a top priority.

[0003] At present, underground gas extraction has many shortcomings in parameter detection. First, the coverage of intelligent gas parameter monitoring equipment is insufficient, and the borehole gas extraction parameters still rely mainly on manual records. There are problems such as delayed information acquisition, low frequency of manual inspections, and human misoperation and misrecording, which make it impossible for technicians to judge abnormal extraction events in time. Secondly, the existing gas parameter monitoring equipment is mainly used for single-hole detection, such as detecting the gas concentration and flow rate in a single borehole. During installation, it is usually necessary to significantly modify the pipeline structure. When facing hundreds of boreholes on the working face, the single-hole detection method has problems such as large-scale supporting equipment, high economic costs, and extremely complex management and control procedures. It does not meet the needs of large-scale continuous monitoring and cost reduction for mining companies. Finally, the existing gas parameter monitoring equipment needs to be directly connected to the extraction pipeline. Under the long-term influence of impurities such as dust and water vapor, key sensor components are contaminated and difficult to clean and maintain, thereby reducing reliability and accuracy, and cannot provide reliable data support for gas extraction.

[0004] In the existing technology, some relevant technical researchers have developed gas parameter monitoring equipment. However, there are still problems such as not fully considering the time required for gas pressure balance of each branch, the impact of residual pressure, pipeline cleaning or pipeline modification, and the safety hazards of the connection between the extraction pipeline and the external environment. Summary of the invention

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

[0006] The scheme of the present invention is as follows: A multi-parameter monitoring device for gas in a coal mine hole, comprising: a flow sensor assembly arranged on a single-hole extraction branch pipe, a gas extraction valve sampling pipeline assembly and a collection and detection device;

[0007] The gas extraction valve sampling pipeline assembly includes a gas sampling pipeline connected to the outlet ends of multiple single-hole extraction branch pipe gas extraction valves, each single-hole extraction branch pipe gas extraction valve is correspondingly provided with a gas sampling pipeline (including No. 1 gas sampling pipeline, No. 2 gas sampling pipeline, ..., No. N gas sampling pipeline), and the other end of each gas sampling pipeline is connected to an air inlet pipeline on the collection and detection device;

[0008] The acquisition and detection device includes a chassis and multiple air inlet pipelines arranged in the chassis, a power supply module for power supply, a pumping pipeline, a valve injector (such as a six-way valve), a signal acquisition module and a main control module; each air inlet pipeline is provided with a branch solenoid valve (including a No. 1 solenoid valve, a No. 2 solenoid valve, ..., a No. N solenoid valve), and the multiple air inlet pipelines are connected to the pumping pipeline after merging. The pumping pipeline is sequentially provided with a temperature sensor, a pressure sensor, a master control solenoid valve and an air pump, and the other end of the pumping pipeline is connected to the No. 1 interface of the valve injector. The No. 2 interface, No. 3 interface and No. 4 interface of the valve injector are respectively connected to the chassis exhaust port, the methane sensor and the carbon monoxide sensor; the No. 5 interface and No. 6 interface of the valve injector are respectively connected to the No. 1 lane gas path interface and the No. 2 lane gas path interface on the chassis; the signal acquisition module is connected to the caliper flow sensor assembly, the temperature sensor, the pressure sensor, the methane sensor and the carbon monoxide sensor by wired or wireless means; the main control module is connected to the signal acquisition module and the solenoid valve control module by wired or wireless means.

[0009] Furthermore, each gas sampling pipeline is provided with a water and 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 caliper-type flow sensors arranged on multiple single-hole extraction branch pipes; at least one caliper-type flow sensor is arranged 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, it also relates to a monitoring method for a multi-parameter monitoring device for gas in a coal mine hole, including a control method for multiple solenoid valves, and the specific method is as follows: the solenoid valve control module controls the opening and closing of solenoid valve No. 1, solenoid valve No. 2, ..., solenoid valve No. N, and the master control solenoid valve; when any one of solenoid valve No. 1, solenoid valve No. 2, ..., and solenoid valve No. N is opened, the other paths are closed, and the gas in one branch pipe is detected each time; when any one of solenoid valve No. 1, solenoid valve No. 2, ..., and solenoid valve No. N is opened, the master control solenoid valve is opened synchronously, and the air 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 last detection, the master control solenoid valve is closed, and the gas temperature and pressure are measured without pump interference; after completing the temperature and pressure measurement, the master control solenoid valve is opened, and subsequent methane and carbon monoxide concentration measurements are performed; when solenoid valve No. 1, solenoid valve No. 2, ..., and solenoid valve No. N are all closed, the master control solenoid valve is closed synchronously.

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

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

[0016] Step 2: After the gas washing is completed, the main control solenoid valve is set to a low level and maintained for a set period of time, and the gas temperature and pressure are measured without interference from the air pump.

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

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

[0019] Thereafter, the solenoid valve corresponding to the single-hole extraction branch pipe to be tested and the master control solenoid valve repeat the above steps 1 to 4 to cyclically detect the parameters of each extraction branch pipe.

[0020] Furthermore, it also includes a method for detecting the concentration of drilling gas, and the specific method is as follows: connect the No. 1 interface on the valve injector with the internal of the No. 3 interface, connect the No. 2 interface with the internal of the No. 4 interface, and connect the No. 5 interface and the No. 6 interface; after completing the temperature and pressure measurement, the main control solenoid valve is opened, and the sampling gas passes through the No. 1 interface and the No. 3 interface in turn, enters the methane sensor and the carbon monoxide sensor in turn, and then passes through the No. 4 interface and the No. 2 interface to the exhaust port and merges into the drilling gas manifold; the related passages of the No. 5 interface and the No. 6 interface are tunnel gas.

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

[0022] Furthermore, a method for determining a normal parameter range in a drainage branch pipe is also included, which specifically includes the following steps:

[0023] Step 1: Data collection and integration

[0024] Monitor multiple extraction branches and collect parameter data of each branch at different time points, including but not limited to gas concentration, temperature, pressure, etc. The parameter data is obtained through flow sensors, temperature sensors, pressure sensors and other devices, and stored in the data acquisition system.

[0025] Step 2: Data preprocessing

[0026] The collected parameter data is preprocessed, including data cleaning, outlier removal, data normalization, etc., to ensure the accuracy and consistency of the data. The data preprocessing step is implemented by a data processing module.

[0027] Step 3: Statistical analysis

[0028] The preprocessed parameter data are statistically analyzed 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 the statistical analysis, the normal range of each parameter was determined. The normal range can be calculated by 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 is 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, humidity, etc.) may affect the normal range of parameters, the 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] Among them, E is calculated based on environmental monitoring data.

[0040] Step 6: Scope Verification

[0041] The accuracy and reliability of the determined normal parameter ranges are verified through additional experiments. The verification step includes comparing the new parameter data with the normal ranges, checking whether they are within the range, and analyzing the data points that are out of range to determine whether the normal ranges need to be adjusted.

[0042] Step 7: Scope Adjustment

[0043] According to the verification results, the normal parameter range is adjusted to adapt to different operating conditions or environmental changes. The adjustment step includes expanding or reducing the normal range and updating the statistical characteristic parameters.

[0044] Step 8: Application and continuous optimization

[0045] The final determined normal parameter range is applied to the pipeline monitoring system for real-time monitoring and anomaly detection. The application steps include setting the alarm threshold of the monitoring system and triggering an alarm when the parameter exceeds the normal range; continuously optimizing the determination method of the normal parameter range and the performance of the monitoring system based on the actual monitoring results and system operation; the normal parameter range of the gas in the pipeline can be determined more accurately, providing a scientific basis for the safe operation and maintenance of the pipeline.

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

[0047] (1) The multi-parameter monitoring device for gas in coal mine boreholes of the present invention connects a multi-hole parallel gas comprehensive parameter monitoring device to the existing gas extraction valve interface of the extraction branch pipe, which can effectively avoid the high cost of deploying single-hole gas parameter monitoring equipment over a large area and transforming the existing extraction pipeline.

[0048] (2) The multi-parameter monitoring device for gas in coal mine boreholes 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 from multiple boreholes by controlling the opening and closing of different solenoid valves, which helps to monitor the key indicators of gas extraction from multiple boreholes in real time and greatly reduce the monitoring cost.

[0049] (3) The multi-parameter monitoring device for gas in coal mine holes of the present invention and the multi-hole parallel gas comprehensive parameter detection device collect gas through the existing gas extraction valves of each branch pipe to measure temperature, negative pressure, methane and carbon monoxide. The integrated caliper flowmeter is clamped on the branch pipe to measure the flow in a non-contact manner. There is no need to modify the pipeline structure, which greatly reduces the difficulty and cost of installation and avoids 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, easy to maintain, and can be reused repeatedly, which further improves the practicality and reliability of the equipment and saves a lot of manpower, material resources and time costs for coal mining enterprises.

[0050] (4) The multi-parameter monitoring device for gas in coal mine holes of the present invention adopts a valve injector structure. By switching between different working modes, the dust and residual gas that may exist in the gas concentration detection gas path can be back-blown and cleaned with the help of the normal pressure gas in the tunnel, thereby improving the detection reliability and accuracy, and effectively avoiding the safety hazards caused by the connection between the negative pressure environment and the atmospheric environment. In addition, the method can also monitor the concentrations of methane and carbon monoxide in the tunnel by switching the valve injector, which is conducive to safe mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Schematic diagram of the installation position of a preferred embodiment of the present invention.

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

[0053] Figure 3 Schematic diagram of solenoid valve control level according to a preferred embodiment of the present invention.

[0054] Figure 4 Schematic diagram of the principle of the borehole gas concentration detection mode of a preferred embodiment of the present invention.

[0055] Figure 5 Schematic diagram of the principles of the gas path purge and tunnel gas concentration detection mode of a preferred embodiment of the present invention.

[0056] The reference numerals in the figure represent: 1-caliper flow sensor No. 1, 2-caliper flow sensor No. 2, 3-caliper flow sensor No. N, 4-water and dust filter No. 1, 5-water and dust filter No. 2, 6-water and dust filter No. N, 7-solenoid valve No. 1, 8-solenoid valve No. 2, 9-solenoid valve No. N, 10-master control solenoid valve, 11-solenoid valve control module, 12-temperature sensor, 13-pressure sensor, 14-air pump, 15-valve injector, 15-1-interface No. 1, 15-2-interface No. 2, 15-3-interface No. 3, 15-4-interface No. 4, 15-5-interface No. 5, 15-6-interface No. 6, 15-7-working 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 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 lane gas line interface, 24-7-No. 2 lane gas line interface, 25-No. 1 single hole extraction Branch pipe, 25-1-No. 1 single-hole extraction branch pipe gas valve, 26-No. 2 single-hole extraction branch pipe, 26-1-No. 2 single-hole extraction branch pipe gas valve, 27-N single-hole extraction branch pipe, 27-1-N single-hole extraction branch pipe gas valve, 28-No. 1 gas sampling pipeline, 29-No. 2 gas sampling pipeline, 30-N gas sampling pipeline, 31-exhaust pipeline, 32-borehole gas manifold, 33-pumping pipeline;

[0057] Note: In the above materials, N is an integer greater than or equal to 3. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Please refer to Figure 1An embodiment of the present invention relates to a multi-porous parallel gas comprehensive parameter monitoring device, including a No. 1 caliper flow sensor 1, a No. 2 caliper flow sensor 2, ..., a No. N caliper flow sensor 3, a No. 1 gas sampling pipeline 28, a No. 2 gas sampling pipeline 29, ..., a No. N gas sampling pipeline 30, a No. 1 water and dust filter 4, a No. 2 water and dust filter 5, ..., a No. N water and dust filter 6, a multi-porous parallel gas comprehensive parameter monitoring host chassis 24, an exhaust pipeline 31 and its internal hardware and software.

[0060] The No. 1 caliper flow sensor 1 is clamped on the No. 1 single-hole extraction branch pipe 25, the No. 2 caliper flow sensor 2 is clamped on the No. 2 single-hole extraction branch pipe 26, and the No. N caliper flow sensor 3 is clamped on the No. N single-hole extraction branch pipe 27 to non-contactly detect the branch pipe gas flow. The signal output ends of the No. 1 caliper flow sensor 1, the No. 2 caliper flow sensor 2, and the No. N caliper 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 gas extraction 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 gas extraction 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 gas extraction valve 27-1, and the other end is connected to the No. N water and dust filter 6 (the above-mentioned water and dust filter includes a water filter and a dust filter).

[0062] The No. 1 water and dust filter 4 is connected to the No. 1 air inlet 24-1 of the chassis, the No. 2 water and dust filter 5 is connected to the No. 2 air inlet 24-2 of the chassis, and the No. N water and 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 the test, the gas enters the borehole gas manifold 32 through the chassis outlet 24-5 and the exhaust pipeline 21.

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

[0064] The outlet ends of the first solenoid valve 7, the second solenoid valve 8 and the Nth solenoid valve 9 are connected to the temperature sensor 12 and the pressure sensor 13. The outlet end of the 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 the solenoid valve No. 1 solenoid valve 7, No. 2 solenoid valve 8, ..., and No. N solenoid valve 9. When any one of the No. 1 solenoid valve 7, No. 2 solenoid valve 8, ..., and No. N solenoid valve 9 is opened, the other ones are closed, and the gas in one branch pipe is detected each time. When any one of the No. 1 solenoid valve 7, No. 2 solenoid valve 8, ..., and No. N solenoid valve 9 is opened, the master control solenoid valve 10 is opened synchronously, and the air pump 14 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 of the previous detection, the master control solenoid valve 10 is closed, and the gas temperature and pressure are measured without pump interference; after completing the temperature and pressure measurement, the master control solenoid valve 10 is opened to perform subsequent methane and carbon monoxide concentration measurements; when the No. 1 solenoid valve 7, No. 2 solenoid valve 8, ..., and No. N solenoid valve 9 are all closed, the fourth solenoid valve 10 is closed synchronously.

[0066] On the other hand, the solenoid valve control module 11 controls the opening and closing of the No. 1 solenoid valve 7, the No. 2 solenoid valve 8, ..., the No. N solenoid valve 9, and the master control solenoid valve 10. When the No. 1 solenoid valve 7, the No. 2 solenoid valve 8, ..., the No. N solenoid valve 9, and the master control solenoid valve 10 are set to a high level, the solenoid valve is opened; when the No. 1 solenoid valve 7, the No. 2 solenoid valve 8, ..., the No. N solenoid valve 9, and the master control solenoid valve 10 are set to a low level, the solenoid valve is closed. When the No. 1 solenoid valve 7 is set to a high level, the master control solenoid valve 10 is synchronously set to a high level, the No. 2 solenoid valve 8 and the No. N solenoid valve 9 are set to a low level, and the air pump 14 pumps the gas in the No. 1 single-hole extraction branch pipe 25 into the detection gas circuit to perform extraction parameter detection. The specific steps are as follows:

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

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

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

[0070] Step 4: After the gas concentration test is completed, the No. 1 solenoid valve 7 and the master control solenoid valve 10 are set to a low level, and all the solenoid valves are in a closed state.

[0071] Thereafter, the solenoid valve corresponding to the single-hole extraction branch pipe to be tested and the master control solenoid valve 10 repeat the above steps 1 to 4 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 sequences shown are only examples. The actual control method can be reasonably set according to the solenoid valve working mode, sensor detection time, etc.

[0073] Technicians in the field should understand that the number of extraction branches, flow sensors, gas sampling circuits, water and dust filters, and solenoid valves in the specific embodiments described here are only examples, and the actual number can be increased or decreased according to 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 valve injector 15 through the air pump 14. Interface 15-1 is connected to the outlet of the air pump 14, interface 15-2 is connected to the exhaust port 24-5 of the chassis, interface 15-3 is connected to the methane sensor 16 and the carbon monoxide sensor 17 in sequence, the outlet of the carbon monoxide sensor 17 is connected to interface 4-4, interface 15-5 and interface 15-6 are connected to the chassis and the interface 24-6 of the lane 1 and the interface 24-7 of the lane 2, respectively.

[0075] Specifically, the power supply module 23 is respectively connected to the main control module 19, the solenoid valve control module 11, the No. 1 solenoid valve 7, the No. 2 solenoid valve 8, the No. 3 solenoid valve 9, the master 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 electromagnetic 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 reception and transmission, result display and external communication.

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

[0078] The communication mode of the wireless communication module 21 includes but is not limited to WiFi, LORA and the like, and the monitoring results can be uploaded to the upper level equipment, such as the underground signal acquisition substation and the surface monitoring platform. The specific implementation mode is set according to the mine environment and surface requirements.

[0079] The communication mode of the wired communication module 21 includes but is not limited to RS485, CAN, optical cable, etc., and the monitoring results can be uploaded to the upper-level equipment, such as the underground signal acquisition substation and the surface monitoring platform. The specific implementation method is set according to the mine environment and surface requirements.

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

[0081] As other implementations, oxygen sensors, carbon dioxide sensors and other equipment may be added to the gas path where the methane sensor 16 and the carbon monoxide sensor 17 are located. These modifications, changes or replacements do not deviate from the essence of the method and should be included in the scope of protection of the present invention.

[0082] Please refer to Figure 1 The chassis 24 is provided with a valve injector working mode switching knob 15-7, and drilling gas concentration detection, gas path purging and tunnel gas concentration detection are realized by switching the working mode.

[0083] Please refer to Figure 4 When the valve injector works in the borehole gas concentration detection mode, the No. 1 interface 15-1 is internally connected to the No. 3 interface 15-3, the No. 2 interface 15-2 is internally connected to the No. 4 interface 15-4, and the No. 5 interface 15-5 is internally connected to the No. 6 interface 15-6. The sampled gas passes through the No. 1 interface 15-1 and the No. 3 interface 15-3, enters the methane sensor 16 and the carbon monoxide sensor 17, and then passes through the No. 4 interface 15-4 and the No. 2 interface 15-2 to the exhaust port 24-5 and merges into the borehole gas manifold 32. The passages related to the No. 5 interface 15-5 and the No. 6 interface 15-6 are tunnel gas.

[0084] Please refer to Figure 5 When the valve injector works in the gas path purging and tunnel gas concentration detection mode, the No. 1 interface 15-1 is internally connected to the No. 2 interface 15-2, the No. 5 interface 15-5 is internally connected to the No. 3 interface 15-3, and the No. 6 interface 15-6 of the valve injector is internally connected to the No. 4 interface 15-4. 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 merges into the borehole gas manifold 32. Since the tunnel gas is at normal pressure and the sampled gas is at negative pressure, under the action of the pressure difference, the tunnel gas enters the methane sensor 16, the carbon monoxide sensor 17 and the connected gas path through the No. 5 interface 15-5 and the No. 6 interface 15-6, realizing gas path purging and cleaning, as well as methane and carbon monoxide concentration detection in the tunnel gas.

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

[0086] In some other embodiments, the present invention also relates to an explosion-proof structural design of a monitoring device, which includes a protective shell made of a pressure-resistant steel plate, which has sufficient strength to withstand the maximum pressure generated by the internal gas explosion without breaking. Inside the shell, a plurality of isolation plates made of high-temperature resistant materials are arranged, and these isolation plates divide the internal space into a plurality of small chambers, each of which is equipped with corresponding parts of a multi-parameter monitoring device for gas in a coal mine hole. When a gas explosion occurs, the isolation plates can effectively limit the propagation of the explosion shock wave and the flame, and protect other unaffected small chambers from continuing to work normally. In addition, a safety valve is arranged on the shell, and when the internal pressure exceeds the preset value, the safety valve automatically opens to release the pressure, further reducing the risk of explosion. The explosion-proof structural design ensures the safety and reliability of the monitoring device in high-risk environments such as coal mines, prolongs the service life of the equipment and protects the lives of miners.

[0087] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. A multi-parameter monitoring device for gas in coal mine holes, characterized in that: include: A flow sensor assembly, a gas extraction valve sampling pipeline assembly and a collection and detection device are arranged on the single-hole extraction branch pipe; The gas extraction valve sampling pipeline assembly includes a gas sampling pipeline connected to the outlet ends of multiple single-hole extraction branch pipe gas extraction valves, each single-hole extraction branch pipe gas extraction valve is correspondingly provided with a gas sampling pipeline, and the other end of each gas sampling pipeline is connected to an air inlet pipeline on the collection and detection device; The acquisition and detection device comprises a chassis (24) and a plurality of air inlet pipelines arranged in the chassis, a power supply module (23) for power supply, a pumping pipeline (33), a valve injector (15), a signal acquisition module and a main control module; each air inlet pipeline is provided with a branch electromagnetic valve, and the plurality of air inlet pipelines are connected to the pumping pipeline (33) after merging; the pumping pipeline (33) is provided with a temperature sensor (12), a pressure sensor (13), a master control electromagnetic valve (10) and an air pump (14) in sequence; the other end of the pumping pipeline (33) is connected to a 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 connected to the pumping pipeline (33); The first and second interfaces (15-3 and 15-4) are connected to the chassis exhaust port (24-5), the methane sensor (16) and the carbon monoxide sensor (17) respectively; the fifth interface (15-5) and the sixth interface (15-6) of the valve injector (15) are connected to the first lane gas path interface (24-6) and the second lane gas path interface (24-7) on the chassis (24) respectively; the signal acquisition module (18) is connected to the caliper flow sensor assembly, the temperature sensor, the pressure sensor, the methane sensor and the 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 holes according to claim 1 is characterized in that: Each gas sampling pipeline is provided with a water and dust filter.

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

5. The multi-parameter monitoring device for gas in coal mine holes according to claim 1, characterized in that: The flow sensor assembly comprises caliper-type flow sensors arranged on a plurality of single-hole extraction branch pipes; at least one caliper-type flow sensor is arranged on each single-hole extraction branch pipe.

6. The monitoring method of the multi-parameter monitoring device for gas in coal mine holes according to claim 1 is characterized in that: The invention comprises a control method for a plurality of electromagnetic valves, and the specific method is as follows: an electromagnetic valve control module (11) controls the opening and closing of a No. 1 electromagnetic valve (7), a No. 2 electromagnetic valve (8), ..., a No. N electromagnetic valve (9), and a master control electromagnetic valve (10); when any one of the No. 1 electromagnetic valve (7), the No. 2 electromagnetic valve (8), ..., and the No. N electromagnetic valve (9) is opened, the other ones are closed, and the gas in one branch pipe is detected each time; when any one of the No. 1 electromagnetic valve (7), the No. 2 electromagnetic valve (8), ..., and the No. N electromagnetic valve (9) is opened, the gas in one branch pipe is detected each time; When the gas is fully exchanged and the residues from the previous test are washed away, the master control solenoid valve (10) is closed, and the gas temperature and pressure are measured without pump interference. After the temperature and pressure measurements are completed, the master control solenoid valve (10) is opened to perform subsequent methane and carbon monoxide concentration measurements. When the No. 1 solenoid valve (7), the No. 2 solenoid valve (8), ..., and the No. N solenoid valve (9) are all closed, the master control solenoid valve (10) is closed synchronously.

7. The monitoring method of the multi-parameter monitoring device for gas in coal mine holes according to claim 6 is characterized in that: The solenoid valve control module (11) controls the opening and closing of the No. 1 solenoid valve (7), the No. 2 solenoid valve (8), ..., and the No. N solenoid valve (9) by means of the high and low states of the electrical levels. The specific steps are as follows: Step 1: The master control solenoid valve (10) maintains a high level for a set period of time to allow for sufficient gas exchange and to wash away the residues from the previous test; Step 2: After the gas washing is completed, the master control solenoid valve (10) is set to a low level and maintained for a set period of time, and the gas temperature and pressure are measured without interference from the gas pump; Step 3: After the temperature and pressure measurements are completed, the master control solenoid valve (10) is set to a high level again and maintained for a set period of time to perform subsequent methane and carbon monoxide concentration measurements; Step 4: After the gas concentration test is completed, the No. 1 solenoid valve (7) and the master control solenoid valve (10) are set to a low level, and at this time all the solenoid valves are in a closed state; Thereafter, the solenoid valve corresponding to the single-hole extraction branch pipe to be tested and the master control solenoid valve (10) repeat the above steps 1 to 4 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 holes according to claim 6 is characterized in that: The invention also includes a method for detecting the concentration of drilling gas, which is specifically as follows: connecting the No. 1 interface (15-1) and the No. 3 interface (15-3) on the valve injector (15), connecting the No. 2 interface (15-2) and the No. 4 interface (15-4), and connecting the No. 5 interface (15-5) and the 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 the No. 3 interface (15-3) in turn, enters the methane sensor (16) and the carbon monoxide sensor (17), and then passes through the No. 4 interface (15-4) and the No. 2 interface (15-2) to the exhaust port (24-5) and merges into the drilling gas manifold (32); the passages related to the No. 5 interface (15-5) and the No. 6 interface (15-6) are tunnel gas.

9. The monitoring method of the multi-parameter monitoring device for gas in coal mine holes according to claim 6 is characterized in that: The invention also includes a method for gas path purging and tunnel gas concentration detection, and the specific method is as follows: the No. 1 interface (15-1) is internally connected to the No. 2 interface (15-2), the No. 5 interface (15-5) is internally connected to the No. 3 interface (15-3), and the No. 6 interface (15-6) is internally connected to the No. 4 interface (15-4); the sampling gas passes through the No. 1 interface (15-1) and the No. 2 interface (15-2) to the exhaust port (24-5) and is merged into the borehole gas manifold (32); since the tunnel gas is at normal pressure and the sampling gas is at negative pressure, under the action of the pressure difference, the tunnel 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), thereby achieving gas path purging and cleaning, as well as methane and carbon monoxide concentration detection in the tunnel gas.

10. The monitoring method of the multi-parameter monitoring device for gas in coal mine holes according to any one of claims 6 to 8, characterized in that: The method for determining the normal parameter range in the extraction branch pipe is also included, which specifically includes the following steps: Step 1: Data collection and integration Monitor multiple extraction branch pipes and collect parameter data of each branch pipe at different time points, the parameters including but not limited to temperature and carbon monoxide; the parameter data is obtained through temperature sensors and carbon monoxide sensor devices and stored in a data acquisition system; Step 2: Data preprocessing Preprocess the collected parameter data, including data cleaning, outlier removal, data normalization, etc., to ensure the accuracy and consistency of the data; The data preprocessing step is implemented by a 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 value and minimum value; Step 4: Determine the normal parameter range Based on the results of the statistical analysis, the normal range of each parameter was determined; the normal range can be calculated by the following formula: Normal range = [μ-k1·σ-k2·MAD, μ+k1·σ+k2·MAD] Where: μ represents the average value of the parameter, σ is 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 influence of environmental factors on the normal range of parameters, the environmental correction term E is introduced to adjust the normal range: Corrected normal range = [μ-k1·σ-k2·MAD-E, μ+k1·σ+k2·MAD+E], where E is calculated based on environmental monitoring data; Step 6: Scope Verification Verifying the accuracy and reliability of the determined normal parameter ranges through additional experiments; the verification step includes comparing the new parameter data with the normal ranges to check whether they are within the ranges, and analyzing the data points outside the ranges to determine whether the normal ranges need to be adjusted; Step 7: Scope Adjustment According to the verification results, the normal parameter range is adjusted to adapt to different operating conditions or environmental changes; the adjustment step includes expanding or reducing the normal range and updating the statistical characteristic parameters; Step 8: Application and continuous optimization The finally determined normal parameter range is applied to the pipeline monitoring system for real-time monitoring and anomaly detection; the application steps include setting the alarm threshold of the monitoring system and triggering an alarm when the parameter exceeds the normal range; and continuously optimizing the method for determining the normal parameter range and the performance of the monitoring system according to the actual monitoring results and system operation conditions.

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