Real-time monitoring system and monitoring method for mine ventilation parameters

Abstract

This invention discloses a real-time monitoring system and method for mine ventilation parameters. The system includes sensors, optical cables, communication cables, network cables, monitoring substations, a power supply, intrinsically safe mine-use ring network switches, ground-based ring network switches, a server, and a coal mine ground monitoring center. Sensors are connected to monitoring substations via communication cables; monitoring substations are connected to the intrinsically safe mine-use ring network switches via optical cables; monitoring substations are connected to each other via optical cables; intrinsically safe mine-use ring network switches are connected to each other via optical cables; monitoring substations and intrinsically safe mine-use ring network switches are each connected to the power supply; the power supply is connected to the underground substation's power source via communication cables; the intrinsically safe mine-use ring network switches are connected to the ground-based ring network switches via optical cables; the ground-based ring network switches are connected to each other via optical cables; the ground-based ring network switches are connected to the server via network cables; and the server is connected to the coal mine ground monitoring center via network cables. This invention achieves digital and intelligent monitoring of mine ventilation parameters.

Description

Technical Field

[0001] This invention relates to the technical field of mine ventilation, and in particular to a real-time monitoring system and method for mine ventilation parameters. Background Technology

[0002] Ventilation is fundamental to ensuring safe and efficient coal mine production. The most important parameters for mine ventilation are wind speed, air volume, and ventilation resistance. Currently, coal mines mainly measure wind speed, air volume, and ventilation resistance manually, which is time-consuming, labor-intensive, inefficient, and the data obtained has a certain time lag.

[0003] The "Coal Mine Safety Regulations" stipulate that mines must establish a ventilation measurement system, conducting a comprehensive ventilation measurement at least once every 10 days; each mining area, wing return airway, and main return airway should have a wind speed sensor installed at its ventilation station; pressure sensors should be installed in the ventilation shafts of the main ventilation fans; and water column gauges (pressure gauges) must be installed in the main ventilation fan rooms. It is evident that the ventilation resistance measurement cycle stipulated in the "Coal Mine Safety Regulations" is too long, and the required locations for real-time monitoring of wind speed and air volume are too few. Furthermore, the ventilation parameter monitoring methods adopted by coal mines according to these regulations are no longer sufficient to meet the needs of current mine digitalization and intelligent construction.

[0004] Therefore, it is particularly necessary to propose a real-time monitoring system for ventilation parameters such as wind speed, air volume, and ventilation resistance throughout the entire mine. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To address this issue, the present invention proposes a real-time monitoring system and method for mine ventilation parameters, which solves the problems of low efficiency and lag in current methods of measuring mine ventilation parameters, and realizes digital and intelligent monitoring of mine ventilation parameters.

[0007] A real-time monitoring system for mine ventilation parameters according to an embodiment of the present invention includes sensors, optical cables, communication cables, network cables, monitoring substations, power supplies, intrinsically safe mine-use ring network switches, ground ring network switches, servers, and a coal mine ground monitoring center; the sensors are connected to the electrical interface of the monitoring substations via the communication cables; the monitoring substations are connected to the intrinsically safe mine-use ring network switches via the optical cables; the monitoring substations are connected to each other via the optical cables; the intrinsically safe mine-use ring network switches are connected to each other via the optical cables; the monitoring substations... The intrinsically safe ring network switch for mining is connected to the power supply, which supplies power to the monitoring substation and the intrinsically safe ring network switch. The power supply is connected to the underground substation power take-off point via the communication cable and is powered by AC power. The intrinsically safe ring network switch for mining is connected to the ground ring network switch via the optical cable. The ground ring network switches are connected to each other via the optical cable. The ground ring network switch is connected to the server via the network cable. The server is connected to the coal mine ground monitoring center via the network cable.

[0008] According to an embodiment of the present invention, the real-time monitoring method for mine ventilation parameters comprises the following steps: Step 1: Installing an air velocity sensor and a differential pressure sensor in the underground roadway where ventilation parameters need to be measured. The air velocity sensor is used to measure the air velocity in the mine ventilation parameters, which is the air velocity at the wind measurement station. The differential pressure sensor is used to measure the ventilation resistance in the mine ventilation parameters. Step 2: The air velocity sensor uploads the measured data to the server through a monitoring substation, a mine-use intrinsically safe ring network switch, and a ground ring network switch. The server calculates the average air velocity based on the data measured by the air velocity sensor. The air volume of the roadway where the air velocity sensor is installed is obtained by multiplying this average air velocity by the cross-sectional area of ​​the air velocity sensor installation location. The differential pressure sensor uploads the measured data to the server through a monitoring substation, a mine-use intrinsically safe ring network switch, and a ground ring network switch. The server calculates the static pressure difference and potential pressure difference based on the data measured by the differential pressure sensor.

[0009] According to an embodiment of the present invention, the real-time monitoring method for mine ventilation parameters comprises the following steps: Step 1: Installing a wind speed sensor and a multi-parameter sensor in the underground roadway where ventilation parameters need to be measured. The wind speed sensor is used to measure the wind speed in the mine ventilation parameters, including the wind speed at the wind measurement station and the wind speed of each individual roadway along the route with the maximum ventilation resistance. Step 2: The wind speed sensor uploads the measured data to the server through a monitoring substation, a mine-use intrinsically safe ring network switch, and a ground ring network switch. The server calculates the average wind speed based on the data measured by the wind speed sensor. Multiplying this average wind speed by the cross-sectional area of ​​the wind speed sensor installation location yields the air volume of the roadway where the wind speed sensor is located. Step 3: The multi-parameter sensor uploads the measured data to the server through a monitoring substation, a mine-use intrinsically safe ring network switch, and a ground ring network switch. The server calculates the static pressure difference based on the data measured by the multi-parameter sensor, and then, in conjunction with the wind speed sensor and ground database data, calculates the dynamic pressure difference and potential pressure difference to finally obtain the ventilation resistance.

[0010] According to the real-time monitoring method for mine ventilation parameters of the present invention, when the underground roadway is a regular roadway, the wind speed in the mine ventilation parameters is measured using a wind speed sensor, and the ventilation resistance in the mine ventilation parameters is measured using a differential pressure sensor; when the underground roadway is an irregular roadway, the wind speed in the mine ventilation parameters is measured using a wind speed sensor, and the static pressure, temperature and relative humidity at the intersection of each single roadway on the route of maximum ventilation resistance are measured using a multi-parameter sensor. The difference in static pressure between the two intersections of each single roadway is the static pressure difference. Then, the mine ventilation resistance is measured by combining the wind speed of each single roadway on the route of maximum ventilation resistance with the data in the ground database.

[0011] The beneficial effects of this invention are as follows: First, it solves the problem of the current limitation of the measurement area for mine wind speed and air volume, and realizes real-time wind measurement throughout the entire mine; second, it can realize real-time online monitoring of mine ventilation resistance, and can select an appropriate scheme according to the specific conditions of the roadway, thus solving the problems of data delay and low efficiency in traditional manual measurement of mine ventilation resistance.

[0012] To be further specific, in the above technical solution, the sensor is composed of a combination of a wind speed sensor and a differential pressure sensor installed in a regular underground roadway and used in conjunction with each other.

[0013] To be further specific, in the above technical solution, the sensor is composed of a combination of a wind speed sensor and a multi-parameter sensor installed in an irregular underground roadway and used in conjunction with each other.

[0014] To be further specific, in the above technical solution, the sensor, the monitoring substation, the power supply, and the intrinsically safe ring network switch for mining are installed underground.

[0015] To be further specific, in the above technical solution, the ground ring network switch and the server are located in the coal mine ground monitoring center.

[0016] To be further specific, in the above technical solution, the optical cable used is a mining flame-retardant single-mode optical cable.

[0017] To be further specific, in the above technical solution, the communication cable used is a mining flame-retardant communication cable.

[0018] To be further specific, in the above technical solution, the power supply is a mining explosion-proof and intrinsically safe multi-channel power supply.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the real-time monitoring system for mine ventilation parameters of the present invention;

[0023] Figure 2 This is a schematic diagram of Embodiment 1 of the present invention;

[0024] Figure 3 This is a layout diagram of Embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of Embodiment 2 of the present invention;

[0026] Figure 5 This is a layout diagram of Embodiment 2 of the present invention;

[0027] Figure 6 This is a schematic diagram of Embodiment 3 of the present invention.

[0028] Figure 7 This is a diagram of an irregular alleyway. Figure 1 ;

[0029] Figure 8 This is a diagram of an irregular alleyway. Figure 2 .

[0030] The labels in the attached diagram are: 1. Differential pressure sensor; 2. Rubber hose; 3. Pitot tube; 4. Multi-parameter sensor; 5. Wind speed sensor; 6. Lane entrance. Detailed Implementation

[0031] To make the technical problems solved, the technical solutions, and the beneficial effects 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 of the invention and are not intended to limit the invention.

[0032] See Figure 1 The real-time monitoring system for mine ventilation parameters includes sensors, optical cables, communication cables, network cables, monitoring substations, power supplies, intrinsically safe mine-use ring network switches, ground ring network switches, servers, and a coal mine ground monitoring center. Ventilation parameters include three main components: wind speed, air volume, and ventilation resistance.

[0033] The sensors include wind speed sensors, differential pressure sensors, and multi-parameter sensors, with different sensors used depending on the method of measuring ventilation parameters. Sensors can be a combination of wind speed sensors and differential pressure sensors installed in regular underground roadways and used in conjunction with each other. Alternatively, sensors can be a combination of wind speed sensors and multi-parameter sensors installed in irregular underground roadways and used in conjunction with each other. The multi-parameter sensor can only measure the static pressure, temperature, and relative humidity at the intersection of each individual roadway. The difference in static pressure between the two intersections of each individual roadway is the static pressure difference. The multi-parameter sensor, in conjunction with the wind speed measured by the wind speed sensor in each individual roadway and data such as the installation elevation of the multi-parameter sensor in the ground database, calculates the dynamic pressure difference and potential pressure difference, and then measures the ventilation resistance of each individual roadway. The ventilation resistances of each individual roadway are then summed to obtain the mine ventilation resistance.

[0034] Sensors, monitoring substations, power supplies, and intrinsically safe ring network switches are located underground. The surface ring network switches and servers are located at the coal mine's surface monitoring center. The optical fiber used is mine-grade flame-retardant single-mode optical fiber. The communication cable is mine-grade flame-retardant communication cable. The power supply is a mine-grade explosion-proof and intrinsically safe multi-channel power supply. It should be noted that although the power supplies for the monitoring substations and the intrinsically safe ring network switches are all named "mine-grade explosion-proof and intrinsically safe multi-channel power supply," their models and power parameters are different; they are specialized equipment.

[0035] The sensors are connected to the electrical interface of the monitoring substation via a mine-use flame-retardant communication cable; the monitoring substation is connected to the mine-use intrinsically safe ring network switch via a mine-use flame-retardant single-mode optical fiber; monitoring substations are connected to each other via mine-use flame-retardant single-mode optical fiber; the mine-use intrinsically safe ring network switch is connected to each other via mine-use flame-retardant single-mode optical fiber; the monitoring substation and the mine-use intrinsically safe ring network switch are each connected to a mine-use explosion-proof and intrinsically safe multi-channel power supply, which supplies power to the monitoring substation and the mine-use intrinsically safe multi-channel power supply. The intrinsically safe ring network switch is used for power supply; the mine explosion-proof and intrinsically safe multi-channel power supply is connected to the underground substation power take-off point through a mine flame-retardant communication cable, and AC power is used to supply the mine explosion-proof and intrinsically safe multi-channel power supply; the mine intrinsically safe ring network switch is connected to the ground ring network switch through a mine flame-retardant single-mode optical cable; the ground ring network switches are connected to each other through a mine flame-retardant single-mode optical cable; the ground ring network switch is connected to the server through a network cable; the server is connected to the coal mine ground monitoring center through a network cable.

[0036] The monitoring method of the real-time monitoring system for mine ventilation parameters employs the following approach for wind speed and air volume monitoring: Wind speed sensors are installed in the roadways where wind speed needs to be measured. The data measured by the wind speed sensors is uploaded to the server via a monitoring substation, a mine-use intrinsically safe ring network switch, and a ground ring network switch. The server calculates the average wind speed from the data measured by the wind speed sensors. Multiplying this average wind speed by the cross-sectional area of ​​the wind speed sensor's installation location yields the air volume of the roadway where the wind speed sensor is located. The server uploads the calculated wind speed and air volume data for each roadway to the coal mine ground monitoring center, where the center displays and views the wind speed and air volume values ​​for each roadway in real time. The cross-sectional area of ​​the roadway where the wind speed sensor is located is measured manually during sensor installation, and this data is pre-entered into the host computer installed on the server for subsequent calculations. The wind speed sensors are installed at points representing the average wind speed of the roadway, and the measured data is uploaded to the server. It's important to note that the wind speed sensor measures the instantaneous wind speed at a specific point within the tunnel, not the average wind speed of the tunnel. However, according to the "average wind speed circle" theory, the wind speed is highest at the center of the tunnel and lowest at the tunnel wall. Therefore, on the connecting line from the center of the tunnel to the tunnel wall, there must exist a point where the wind speed is exactly equal to the average wind speed of the tunnel. Connecting these points on the countless connecting lines from the center of the tunnel to the surrounding tunnel walls forms the "average wind speed circle." Thus, the wind speed sensor is installed on the average wind speed circle, so theoretically, the instantaneous wind speed measured by the wind speed sensor is the average wind speed. However, in reality, the airflow in the tunnel is turbulent. One characteristic of turbulent flow is that the wind speed has turbulent fluctuations, meaning that the instantaneous wind speed at a certain point will fluctuate around the average wind speed at that point. Therefore, the server further fits the measured wind speed sensor data to calculate the average wind speed.

[0037] Depending on the measurement principle and the type of sensor used, different methods are employed for monitoring ventilation resistance.

[0038] It should be noted that the route with the greatest ventilation resistance consists of multiple roadways, and these roadways intersect with other roadways in the mine at intersection points. Additionally, for clarity, the intake shaft of the exhaust ventilation system, the return shaft of the forced ventilation system, and the connection point between the ventilation shaft and the main ventilation fan are also treated as intersection points. The roadway between two intersection points is defined as a single roadway.

[0039] Example 1:

[0040] See Figure 2 and Figure 3 A method for real-time monitoring of mine ventilation parameters, using a differential pressure sensor in conjunction with a wind speed sensor, is described below:

[0041] Step 1: Install the wind speed sensor and differential pressure sensor in the underground roadway where the ventilation parameters need to be measured. The wind speed sensor is used to measure the wind speed in the mine ventilation parameters, which is the wind speed of the wind measuring station; the differential pressure sensor is used to measure the ventilation resistance in the mine ventilation parameters.

[0042] Step 2: The wind speed sensor uploads its measured data to the server via the monitoring substation, the intrinsically safe mine ring network switch, and the ground ring network switch. The server calculates the average wind speed from the data measured by the wind speed sensor. Multiplying this average wind speed by the cross-sectional area of ​​the wind speed sensor's installation location gives the airflow in the roadway where the wind speed sensor is located. The differential pressure sensor uploads its measured data to the server via the monitoring substation, the intrinsically safe mine ring network switch, and the ground ring network switch. The server calculates the static pressure difference and potential pressure difference from the data measured by the differential pressure sensor. It should be noted that the wind speed sensor is used to measure wind speed, and then multiplying it by the cross-sectional area to obtain the airflow. At this point, the wind speed sensor's function is complete. The differential pressure sensor and the wind speed sensor are connected in parallel and do not interfere with each other. The differential pressure sensor measures ventilation resistance. Since the differential pressure sensor only measures static pressure difference and potential pressure difference, and does not measure dynamic pressure difference, and since the wind speed variation in a regular roadway is small, the dynamic pressure difference can be ignored, and therefore, it is not necessary to measure the dynamic pressure difference. Therefore, the roadway where the differential pressure sensor is installed must be regular.

[0043] Differential pressure sensor 1 is used to monitor the mine ventilation resistance in real time. For each individual roadway, differential pressure sensor 1 is placed in the middle of the roadway. The hose connection of differential pressure sensor 1 is connected to two hoses 2, which are respectively connected to pitot tubes 3. The static pressure difference and potential pressure difference measured by differential pressure sensor 1 for each individual roadway are uploaded to the monitoring substation via a communication cable. The underground monitoring substation uploads the data signals from each connected sensor to the intrinsically safe ring network switch in the mine via optical fiber. The intrinsically safe ring network switch in the mine uploads the data signals from each connected monitoring substation to the ground ring network switch via optical fiber. The ground ring network switch uploads the data signals from each connected intrinsically safe ring network switch in the mine to the server via optical fiber. After the server performs unified calculations on the differential pressure sensor data, it sends the calculation results to the coal mine ground monitoring center via optical fiber. The formula used by the server to calculate the sensor data is as follows:

[0044]

[0045] Where h represents the mine ventilation resistance; h i This represents the ventilation resistance of the i-th tunnel.

[0046] The ventilation resistance h of the i-th tunnel i The calculation formula is:

[0047] h i =P i +E i

[0048] Among them, P i E represents the static pressure difference in the i-th roadway; i The differential pressure difference in the i-th roadway is directly measured by the differential pressure sensor. Since the air volume and velocity in each individual roadway do not change significantly, the dynamic pressure difference can be ignored. The above formula can be used to calculate the ventilation resistance of each individual roadway, and the sum of these values ​​represents the overall mine ventilation resistance. It should be noted that differential pressure sensor 1 directly measures the static pressure difference and the differential pressure difference.

[0049] In this embodiment 1, only one differential pressure sensor 1 needs to be configured in each single roadway, which has a low cost and a relatively smaller measurement error than multi-parameter sensors. However, its applicability is poor and it is generally suitable for roadways with relatively regular cross-sections.

[0050] Example 2:

[0051] See Figure 4 and Figure 5 A method for real-time monitoring of mine ventilation parameters, using multiple parameter sensors in conjunction with a wind speed sensor, is described below:

[0052] Step 1: Install the wind speed sensor and multi-parameter sensor in the underground roadway where the ventilation parameters need to be measured. The wind speed sensor is used to measure the wind speed in the mine ventilation parameters. The wind speed includes the wind speed at the wind measurement station and the wind speed in each individual roadway on the route with the maximum ventilation resistance. The wind speed sensor needs to be placed not only in the wind measurement station, but also in each individual roadway on the route with the maximum ventilation resistance.

[0053] Step 2: The wind speed sensor uploads the measured data to the server through the monitoring substation, the intrinsically safe ring network switch for mining, and the ground ring network switch. The server calculates the average wind speed based on the data measured by the wind speed sensor. Based on this average wind speed, the air volume of the roadway where the wind speed sensor is installed can be obtained by multiplying the cross-sectional area of ​​the wind speed sensor installation location.

[0054] Step 3: The multi-parameter sensor uploads the measured data to the server through the monitoring substation, the intrinsically safe ring network switch for mining, and the ground ring network switch. The server calculates the static pressure difference based on the data measured by the multi-parameter sensor, and then uses the wind speed sensor and ground database data to measure the dynamic pressure difference and potential pressure difference, finally obtaining the ventilation resistance.

[0055] It should be noted that since the ventilation resistance measured by the multi-parameter sensor scheme includes static pressure difference, potential pressure difference, and dynamic pressure difference, wind speed is required. Therefore, the wind speed measured by the wind speed sensor not only represents the wind speed in the roadway but is also used to calculate the air volume. Finally, it is necessary to combine the difference in static pressure measured by two adjacent multi-parameter sensors and the elevation of the multi-parameter sensor installation position to calculate the dynamic pressure difference and potential pressure difference. Finally, the system adds the static pressure difference, potential pressure difference, and dynamic pressure difference together to obtain the mine ventilation resistance.

[0056] Mine ventilation resistance is monitored in real time using a multi-parameter sensor 4 and a wind speed sensor. The multi-parameter sensor 4 is positioned at the intersection of each individual roadway along the route with the greatest ventilation resistance. The wind speed sensor 5 is positioned on the sidewall of each roadway at least 10 meters from any roadway entrance 6. The absolute pressure, temperature, and relative humidity measured by the multi-parameter sensor 4, and the wind speed at the roadway entrance measured by the wind speed sensor 5, are transmitted via cable to the monitoring substation. The underground monitoring substation transmits the data signals from each connected sensor to a mine-use intrinsically safe ring network switch via fiber optic cable. The mine-use intrinsically safe ring network switch transmits the data signals from each connected substation to a ground-based ring network switch via fiber optic cable. The ground-based ring network switch transmits the data signals from each connected mine-use intrinsically safe ring network switch to a server via fiber optic cable. The server performs unified calculations on the sensor data and transmits the results to the ground monitoring center via fiber optic cable. The formula used by the server to calculate the sensor data is as follows:

[0057]

[0058] Where h represents the mine ventilation resistance; h i This represents the ventilation resistance of the i-th tunnel.

[0059] The ventilation resistance h of the i-th tunnel i The calculation formula is:

[0060] h i =P i +E i +h vi

[0061] Among them, P i The static pressure difference in the i-th roadway is determined by the difference in static pressure values ​​measured by the multi-parameter sensor 4 at the two intersections of each individual roadway; E i The pressure difference in the i-th tunnel is calculated from the temperature, relative humidity, and static pressure at each intersection measured by the multi-parameter sensor 4, combined with table data such as the partial pressure of saturated water vapor at the same temperature in the server database; h vi The dynamic pressure difference in the i-th roadway is calculated from the average wind speed measured by six wind speed sensors 5 at the entrance of each roadway, the temperature and humidity measured by the multi-parameter sensor 4, and the water vapor partial pressure at the same temperature obtained from a table on the server. It should be noted that the multi-parameter sensor measures the static pressure, and the static pressure difference is obtained by subtracting the static pressure measured by two adjacent multi-parameter sensors.

[0062] This embodiment 2 has strong applicability, especially suitable for vertical shafts and tunnels with irregular cross-sections caused by tunnel confinement, support, etc. However, the cost of arranging two multi-parameter sensors and one wind speed sensor in each single tunnel is relatively high.

[0063] Example 3:

[0064] See Figure 6A real-time monitoring method for mine ventilation parameters is proposed. When the underground roadways are regular, an anemometer is used to measure the wind speed, and a differential pressure sensor is used to measure the ventilation resistance. When the underground roadways are irregular, anemometers are used to measure the wind speed, and multi-parameter sensors are used to measure the static pressure, temperature, and relative humidity at the intersections of each individual roadway along the route with the maximum ventilation resistance. The difference in static pressure between the two intersections of each individual roadway is the static pressure difference. This static pressure difference is then used in conjunction with the wind speed data of each individual roadway along the route with the data from the surface database to measure the mine ventilation resistance. It should be noted that although using differential pressure sensors combined with anemometers for real-time monitoring of mine ventilation parameters is simple and requires fewer sensors, it lacks dynamic pressure difference, and not every roadway is perfectly regular, thus limiting its applicability. Furthermore, while using multi-parameter sensors combined with anemometers for real-time monitoring of mine ventilation parameters has better applicability, it is more cumbersome and costly to operate. Therefore, it is necessary to consider the actual situation and select the appropriate method in the appropriate place; when the underground roadways are regular, differential pressure sensors in conjunction with wind speed sensors can be used to monitor mine ventilation parameters in real time; see Figure 7 and Figure 8 In the case of irregular underground roadways, multi-parameter sensors are used in conjunction with wind speed sensors to monitor mine ventilation parameters in real time.

[0065] Real-time monitoring of mine ventilation resistance is achieved using multi-parameter sensors, wind speed sensors, and differential pressure sensors. On the route of maximum ventilation resistance, for a single roadway, if its cross-section is relatively regular (i.e., the wind speed variation within the roadway is small), a differential pressure sensor is used to monitor the ventilation resistance of that roadway. If the cross-section of the single roadway is irregular (i.e., the wind speed variation within the same roadway is significant), a multi-parameter sensor combined with a wind speed sensor is used to monitor the ventilation resistance of that roadway. In other words, after determining the stability of airflow and wind speed in each single roadway along the route of maximum ventilation resistance, appropriate sensors are selected to form an online monitoring system for ventilation resistance. The server records the sensor type used for each single roadway, selects the corresponding calculation formula, and then accumulates the ventilation resistance of each single roadway along the route of maximum ventilation resistance to obtain the mine ventilation resistance.

[0066] The structural features of this embodiment 3 are the same as those of embodiments 1 and 2. Specifically, for each single tunnel, depending on the type of sensor selected, its installation method, system connection method, and ventilation resistance measurement principle are the same as those of embodiments 1 or 2.

[0067] All three methods for measuring mine ventilation resistance can achieve real-time online monitoring of mine ventilation resistance, overcoming the problems of time-consuming, labor-intensive, inefficient, and data-delayed traditional manual measurement of ventilation resistance. This is beneficial for ensuring safe and efficient mine ventilation and promoting the development of mine ventilation resistance measurement towards digitalization and intelligence.

[0068] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A real-time monitoring system for mine ventilation parameters, characterized in that: This includes sensors, optical cables, communication cables, network cables, monitoring substations, power supplies, intrinsically safe ring network switches for mining, ground ring network switches, servers, and coal mine ground monitoring centers; The sensor is connected to the electrical interface of the monitoring substation via the communication cable; The monitoring substation is connected to the intrinsically safe ring network switch for mining via the optical cable; The monitoring substations are connected to each other via the optical cable; The intrinsically safe ring network switch for mining is connected to the intrinsically safe ring network switch for mining via the optical cable; The monitoring substation and the intrinsically safe ring network switch for mining are respectively connected to the power supply, and the power supply provides power to the monitoring substation and the intrinsically safe ring network switch for mining. The power source is connected to the power take-off point of the underground substation through the communication cable, and AC power is used to supply the power source; The intrinsically safe ring network switch for mining is connected to the ground ring network switch via the optical cable; The ground ring network switches are connected to each other by the optical cable; The ground ring network switch is connected to the server via the network cable; The server is connected to the coal mine ground monitoring center via the network cable; The sensor is composed of a wind speed sensor (5) and a differential pressure sensor (1) installed in a regular underground roadway and used in conjunction with each other. The specific monitoring method is as follows: Step 1.1: Install the wind speed sensor (5) and the differential pressure sensor (1) in the underground roadway where the ventilation parameters need to be measured. The wind speed sensor (5) is used to measure the wind speed in the mine ventilation parameters, which is the wind speed of the wind measuring station; the differential pressure sensor (1) is used to measure the ventilation resistance in the mine ventilation parameters. For each single roadway, the differential pressure sensor (1) is placed in the middle of the roadway. The rubber hose connection port of the differential pressure sensor (1) is connected to two rubber hoses (2). 2) Connect the Pitot tubes (3) respectively, with the Pitot tubes (3) arranged in the direction of airflow; Step 1.2, the wind speed sensor (5) uploads the measured data to the server through the monitoring substation, the intrinsically safe ring network switch for mining, and the ground ring network switch. The server calculates the average wind speed based on the data measured by the wind speed sensor (5). Based on this average wind speed, multiplying it by the cross-sectional area of ​​the installation location of the wind speed sensor (5) will give the air volume of the roadway where the wind speed sensor (5) is located; the differential pressure sensor (1) uploads the measured data to the server through the monitoring substation, the intrinsically safe ring network switch for mining, and the ground ring network switch. The data monitored by the differential pressure sensor (1) is the ventilation resistance of the roadway; When the underground roadway is a regular roadway, the wind speed in the mine ventilation parameters is measured by the wind speed sensor (5), and the ventilation resistance in the mine ventilation parameters is measured by the differential pressure sensor (1).

2. The real-time monitoring system for mine ventilation parameters according to claim 1, characterized in that: The sensors, the monitoring substation, the power supply, and the intrinsically safe ring network switch for mining are installed underground.

3. The real-time monitoring system for mine ventilation parameters according to claim 1, characterized in that: The ground ring network switch and the server are located in the coal mine ground monitoring center.

4. The real-time monitoring system for mine ventilation parameters according to claim 1, characterized in that: The optical cable used is a mining flame-retardant single-mode optical cable.

5. The real-time monitoring system for mine ventilation parameters according to claim 1, characterized in that: The communication cable used is a flame-retardant communication cable for mining.

6. The real-time monitoring system for mine ventilation parameters according to claim 1, characterized in that: The power supply used is a mining-grade explosion-proof and intrinsically safe multi-channel power supply.

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