Coal mine tunneling working face air curtain system

Abstract

The application discloses a kind of coal mine driving face air curtain systems, including air inlet pipe, air outlet pipe, air curtain generating device and dust removal device, the import of the air outlet pipe is equipped with first fan, the air curtain generating device is located in the driving face and is communicated with the air inlet pipe, the dust removal device is located in the driving face, to compensate the clean air that the air inlet pipe is transported to in the air curtain generating device.The coal mine driving face air curtain system of the application effectively isolates the dust generated when mining, reduces the dust concentration of working face, improves the breathing environment of workers, and reduces the occurrence of occupational diseases.Purification by dust removal device, part of the dust-containing air is converted into clean air and reused to supplement the air inlet pipe, effectively ensuring the amount of fresh air delivered by the air inlet pipe into the fully mechanized working face, avoiding the reduction of air supply to the driving face due to the existence of air distribution, effectively ensuring the working environment and work efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal mine ventilation technology, specifically to an air curtain system for fully mechanized coal mining faces. Background Technology

[0002] In coal mine tunneling operations, processes such as drilling, blasting, and loading generate large amounts of dust and harmful gases, seriously threatening the health and safety of workers. To reduce dust dispersion during coal mining, related technologies involve installing air curtains at the tunneling face to achieve dust isolation. However, the construction method of the air curtain at the tunneling face involves connecting the air curtain generator to the opening in the pressing section. Due to the air distribution effect, the amount of air supplied to the tunneling face is reduced, thus affecting the working environment and work efficiency. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an air curtain system for coal mine tunneling faces.

[0005] The coal mine tunneling face air curtain system of this invention includes an air inlet duct, an air outlet duct, an air curtain generating device, and a dust removal device. The inlet of the air inlet duct is used to communicate with clean air, and the outlet of the air inlet duct is used to deliver clean air toward the tunneling face. The inlet of the air outlet duct is provided with a first fan, which is used to introduce dust-laden air in the tunneling face into the air outlet duct and discharge it.

[0006] The air curtain generating device is located inside the tunneling face and is connected to the air intake duct so that some of the clean air in the air intake duct is transported to the air curtain generating device. The air curtain generating device is used to generate an air curtain to isolate the dust generated by the coal mining machine during coal mining. The dust removal device is located inside the tunneling face and is connected to the air outlet duct and the air inlet duct. The dust removal device is used to purify at least a portion of the dust-laden air in the air outlet duct into clean air and deliver it to the air inlet duct to compensate for the clean air delivered to the air curtain generating device by the air inlet duct.

[0007] In some embodiments, the outlet of the air intake duct is provided with a first electrically controlled air valve, which is used to control the flow rate of clean air delivered by the air intake duct to the tunneling face.

[0008] In some embodiments, a second electrically controlled air valve is provided between the air inlet duct and the air curtain generating device. The second electrically controlled air valve is used to control the flow rate of clean air delivered from the air inlet duct to the air curtain generating device.

[0009] In some embodiments, a third electrically controlled air valve is provided between the air outlet duct and the dust removal device, the third electrically controlled air valve being used to control the flow rate of dust-laden air delivered from the air outlet duct to the dust removal device.

[0010] In some embodiments, the coal mine tunneling face air curtain system of the present invention includes a gas concentration sensor. The gas concentration sensor is installed in the tunneling face to detect the gas concentration of the tunneling face. The gas concentration sensor is connected to the first fan, the first electrically controlled air valve, the second electrically controlled air valve and the third electrically controlled air valve through a controller. When the detected value of the gas concentration sensor exceeds a first preset value, the controller controls the first fan to increase its speed, the first electrically controlled air valve to increase its opening, the second electrically controlled air valve to decrease its opening and the third electrically controlled air valve to increase its opening.

[0011] In some embodiments, the coal mine tunneling face air curtain system of the present invention includes a dust concentration sensor. The dust concentration sensor is installed in the tunneling face to detect the dust concentration of the tunneling face. The dust concentration sensor is connected to the first fan, the first electrically controlled air valve, the second electrically controlled air valve, and the third electrically controlled air valve via a controller. When the detected value of the dust concentration sensor exceeds a second preset value, the controller controls the first fan to increase its speed, the first electrically controlled air valve to decrease its opening, the second electrically controlled air valve to increase its opening, and the third electrically controlled air valve to increase its opening.

[0012] In some embodiments, the air curtain generating device includes a mounting plate, a second fan, and a plurality of nozzles. The second fan is disposed on the mounting plate, and the plurality of nozzles are spaced apart on the mounting plate along a first direction. The air inlet of the second fan is connected to the air inlet duct, and the air outlet of the second fan is connected to the nozzles, so that the nozzles spray clean air to form an air curtain. The second electrically controlled valve is disposed between the second fan and the air inlet duct.

[0013] In some embodiments, a first filter is provided between the second fan and the nozzle, the first filter being used to filter impurities in the clean air.

[0014] In some embodiments, the mounting plate is provided with a humidity sensor and a wind speed sensor, the humidity sensor being used to monitor the humidity of the air curtain and the wind speed of the air curtain.

[0015] In some embodiments, a dryer is provided between the dust removal device and the air inlet duct.

[0016] The coal mine tunneling face air curtain system of this invention effectively isolates dust generated during coal mining by setting up air curtains, reducing dust concentration at the working face, improving the breathing environment for workers, and reducing the incidence of occupational diseases. The air curtain reduces the contamination of the working face by dust-laden air, allowing workers to focus more on their work and improving efficiency. Through the purification effect of the dust removal device, some of the dust-laden air is converted into clean air and reused to supplement the air intake duct, effectively ensuring the amount of fresh air delivered to the fully mechanized mining face by the air intake duct. This avoids a reduction in the air supply to the tunneling face due to air distribution, effectively guaranteeing the working environment and work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation of the air curtain system in a coal mine tunneling face according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the air curtain system for a coal mine tunneling face according to an embodiment of the present invention.

[0019] Figure label: 100. Tunneling face; 200. Coal mining machine; 300. Hydraulic support; 1. Inlet duct; 2. Outlet duct; 3. First fan; 4. Air curtain generator; 401. Mounting plate; 402. Second fan; 403. Nozzle; 5. Air curtain; 6. Dust removal device; 7. First electrically controlled air valve; 8. Second electrically controlled air valve; 9. Third electrically controlled air valve; 10. Gas concentration sensor; 11. Dust concentration sensor; 12. First filter; 13. Dryer. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figure 1 and Figure 2 As shown, the coal mine tunneling face air curtain system of this embodiment includes an air inlet duct 1, an air outlet duct 2, an air curtain generating device 4, and a dust removal device 6. The inlet of the air inlet duct 1 is used to communicate with clean air, and the outlet of the air inlet duct 1 is used to deliver clean air toward the tunneling face 100. The inlet of the air outlet duct 2 is equipped with a first fan 3, which is used to introduce dust-laden air in the tunneling face 100 into the air outlet duct 2 and then discharge it.

[0022] An air curtain generating device 4 is installed inside the tunneling face 100 and connected to the air intake duct 1, so that some of the clean air in the air intake duct 1 is transported to the air curtain generating device 4. The air curtain generating device 4 is used to generate an air curtain 5 to isolate the dust generated by the coal mining machine 200 during coal mining.

[0023] The dust removal device 6 is installed in the tunneling face 100 and is connected to the exhaust duct 2 and the intake duct 1. The dust removal device 6 is used to purify at least part of the dust-laden air in the exhaust duct 2 into clean air and deliver it to the intake duct 1 to compensate for the clean air delivered to the air curtain generator 4 by the intake duct 1.

[0024] In this embodiment of the coal mine tunneling face air curtain system, the inlet of the air intake duct 1 is connected to an external clean air source to introduce fresh air into the system. The outlet of the air intake duct 1 faces the tunneling face 100 and is used to deliver clean air to the tunneling face 100. A first fan 3 is installed inside the air outlet duct 2 to draw dust-laden air from the tunneling face 100 into the air outlet duct 2 and discharge it from the face, reducing the dust concentration at the face. An air curtain generating device 4 is installed inside the tunneling face 100 and is connected to the air intake duct 1. It receives a portion of the clean air from the air intake duct 1 and generates an air curtain 5 to isolate the dust generated by the coal mining machine 200 during coal mining, preventing it from spreading to other areas of the face. A dust removal device 6 is located inside the tunneling face 100 and is connected to both the air outlet duct 2 and the air intake duct 1. It purifies the dust-laden air in the outlet duct 2, converting at least a portion of the dust-laden air into clean air, and then sends it back to the inlet duct 1 to replenish the amount of clean air lost due to the use of the air curtain generator 4.

[0025] The coal mine tunneling face air curtain system of this invention effectively isolates dust generated during coal mining by setting up air curtain 5, reducing the dust concentration at the working face, improving the breathing environment of workers, and reducing the occurrence of occupational diseases. The air curtain 5 reduces the pollution of the working face by dust-laden air, allowing workers to focus more on their work and improving work efficiency. Through the purification effect of the dust removal device 6, some of the dust-laden air is converted into clean air and reused to supplement the air intake duct 1, effectively ensuring the amount of fresh air delivered to the fully mechanized mining face by the air intake duct 1. This avoids a reduction in the air supply to the tunneling face 100 due to air distribution, effectively ensuring the working environment and work efficiency.

[0026] In some embodiments, such as Figure 2 As shown, the outlet of the air intake duct 1 is equipped with a first electrically controlled air valve 7, which is used to control the flow rate of clean air delivered from the air intake duct 1 to the tunneling face 100.

[0027] The first electrically controlled air valve 7 is a remotely controllable valve that can automatically or manually adjust the airflow according to the actual needs of the working face. Through the first electrically controlled air valve 7, operators can adjust the airflow in real time according to environmental changes at the tunneling face 100 (such as dust concentration, work intensity, etc.) to meet different ventilation requirements. The first electrically controlled air valve 7 makes the adjustment of the airflow more flexible and rapid, responding promptly to changes at the working face and ensuring a constant supply of clean air. Precise control of the airflow helps optimize ventilation, reduce unnecessary energy waste, and avoids a reduction in the effectiveness of the air curtain 5 due to excessive airflow. Precise control of the airflow also allows for better control of dust concentration at the working face, further improving the working environment and protecting miners' health.

[0028] In some embodiments, such as Figure 2 As shown, a second electrically controlled air valve 8 is provided between the air inlet duct 1 and the air curtain generating device 4. The second electrically controlled air valve 8 is used to control the flow rate of clean air delivered from the air inlet duct 1 to the air curtain generating device 4.

[0029] The second electrically controlled air valve 8 is specifically designed to regulate the flow rate of clean air supplied to the air curtain generator 4. Independent of the first electrically controlled air valve 7, it allows for more precise airflow control. The second electrically controlled air valve 8 can be adjusted automatically or manually to adapt to different working conditions and maintain the stability of the air curtain 5. Precise control of the airflow to the air curtain generator 4 allows for better formation of the air curtain 5, improving dust isolation. The second electrically controlled air valve 8 allows operators to adjust the airflow distribution between the air curtain generator 4 and other areas of the tunneling face 100 according to actual needs, achieving optimized airflow configuration. Precise airflow control helps reduce unnecessary energy consumption because only the required airflow to the air curtain generator 4 is supplied, avoiding over-supply. The second electrically controlled air valve 8 enhances the adaptability of the ventilation system to different working environments, enabling adjustments to airflow based on varying operating conditions.

[0030] In some embodiments, such as Figure 2 As shown, a third electrically controlled air valve 9 is provided between the air outlet duct 2 and the dust removal device 6. The third electrically controlled air valve 9 is used to control the flow rate of dust-containing air delivered from the air outlet duct 2 to the dust removal device 6.

[0031] The third electrically controlled air valve 9 is specifically used to regulate the flow rate of dust-laden air delivered from the outlet duct 2 to the dust removal device 6, ensuring the efficient operation of the dust removal device 6. Through the third electrically controlled air valve 9, the flow rate of dust-laden air can be adjusted in real time to adapt to different working environments and dust removal needs. By precisely controlling the flow rate of dust-laden air entering the dust removal device 6, dust removal efficiency can be improved, ensuring effective dust removal. Excessive dust-laden air may burden the dust removal equipment; the third electrically controlled air valve 9 helps avoid this, protecting the dust removal equipment and extending its service life. By adjusting the flow rate of dust-laden air, the effect of the air curtain 5 can be better maintained, while avoiding the impact of excessive or insufficient airflow on ventilation.

[0032] In some embodiments, the coal mine tunneling face air curtain system of this invention includes a gas concentration sensor 10, which is installed in the tunneling face 100 to detect the gas concentration in the tunneling face 100. The gas concentration sensor 10 is connected to a first fan 3, a first electrically controlled air valve 7, a second electrically controlled air valve 8, and a third electrically controlled air valve 9 via a controller. When the detected value of the gas concentration sensor 10 exceeds a first preset value, the controller controls the first fan 3 to increase its speed, the first electrically controlled air valve 7 to increase its opening, the second electrically controlled air valve 8 to decrease its opening, and the third electrically controlled air valve 9 to increase its opening.

[0033] A gas concentration sensor 10 is installed inside the tunneling face 100 to detect the gas concentration in the air in real time. The gas concentration sensor 10 is connected to a controller, which is in turn connected to the first blower 3, the first electrically controlled air valve 7, the second electrically controlled air valve 8, and the third electrically controlled air valve 9 to form an automatic control system.

[0034] Specifically, when the methane concentration exceeds the first preset value, the controller automatically triggers a series of response mechanisms to increase the speed of the first fan 3, thereby quickly extracting the high-concentration methane from the tunneling face 100. The second electrically controlled air valve 8 is reduced in opening, while the first electrically controlled valve 7 and the third electrically controlled air valve 9 are increased in opening, so that the dust removal device 6 outputs a large amount of clean air after dust removal and enters the air intake duct 1. Most of the clean air in the air intake duct 1 is used to transport to the tunneling face 100, and only a small portion of the clean air is transported to the air curtain generating device 4 to form an air curtain 5. While effectively ensuring the generation of the air curtain 5, the methane concentration in the tunneling face 100 can be quickly diluted, effectively ensuring the working environment within the tunneling face 100 and preventing the coal mining machine 200 from shutting down due to increased methane concentration.

[0035] Therefore, by monitoring gas concentration in real time, the system can respond immediately upon detecting excessive gas concentration, reducing the risk of gas accumulation and preventing gas explosions. The automatic control system can respond instantly upon detecting excessive gas concentration, improving the speed of emergency response. The system adjusts the fan speed and damper opening based on the gas concentration, more effectively controlling airflow and direction to optimize ventilation. Under normal conditions, the system maintains economical ventilation; when the gas concentration exceeds the limit, it increases ventilation, thus saving energy. The automatic control system reduces the need for manual monitoring and operation, lowering labor intensity and minimizing the possibility of human error. The system's automatic adjustment ensures a stable working environment, thereby improving work efficiency.

[0036] In some embodiments, the coal mine tunneling face air curtain system of this invention includes a dust concentration sensor 11, which is installed within the tunneling face 100 to detect the dust concentration at the tunneling face 100. The dust concentration sensor 11 is connected to a first fan 3, a first electrically controlled air valve 7, a second electrically controlled air valve 8, and a third electrically controlled air valve 9 via a controller. When the detected value of the dust concentration sensor 11 exceeds a second preset value, the controller controls the first fan 3 to increase its speed, the first electrically controlled air valve 7 to decrease its opening, the second electrically controlled air valve 8 to increase its opening, and the third electrically controlled air valve 9 to increase its opening.

[0037] The dust concentration sensor 11 is installed inside the tunneling face 100 to detect the dust concentration of the face in real time. The dust concentration sensor 11 is connected to the controller, which is then connected to the first fan 3, the first electrically controlled air valve 7, the second electrically controlled air valve 8, and the third electrically controlled air valve 9 to form an automated dust control system.

[0038] Specifically, when the dust concentration exceeds a first preset value, the controller automatically triggers a series of response mechanisms to increase the speed of the first fan 3, thereby quickly extracting the high-concentration dust from the tunneling face 100. The first electrically controlled air valve 7 is opened less to reduce the amount of clean air blown into the tunneling face 100 by the air intake duct 1, preventing further dust diffusion. Meanwhile, the second electrically controlled air valve 8 and the third electrically controlled air valve 9 are opened more to allow a large amount of clean air after dust removal from the dust removal device 6 to enter the air intake duct 1. Most of the clean air in the air intake duct 1 is then transported to the air curtain generator 4, forming a thicker air curtain 5, improving the protective effect of the air curtain 5 and preventing the diffusion of high-concentration dust from the tunneling face 100. Only a small portion of clean air is delivered to the tunneling face 100 for working environment and breathing purposes. While effectively ensuring coal mining, it can quickly dilute the dust concentration in the tunneling face 100, effectively ensuring the working environment inside the tunneling face 100 and avoiding the shutdown of the coal mining machine 200 due to increased dust concentration.

[0039] Therefore, real-time monitoring and adjustment of dust concentration helps to reduce dust concentration at the working face in a timely manner, improving the breathing environment for workers. This reduces the risk of dust inhalation, protects miners' health, and reduces the incidence of occupational diseases. The control system can automatically adjust airflow and direction based on changes in dust concentration, improving ventilation and dust removal efficiency. When dust concentration exceeds the standard, adjusting the opening of the air valves and the fan speed can enhance the isolation effect of the air curtain 5, preventing dust diffusion. When the dust concentration is low, the system can maintain a low ventilation volume, saving energy; when the dust concentration exceeds the standard, the ventilation volume is increased to achieve rational energy utilization. The automated control system reduces the need for manual monitoring and operation, lowering labor intensity and the possibility of human error. Effectively controlling dust concentration not only improves workplace safety but also increases production efficiency.

[0040] In some embodiments, such as Figure 2 As shown, the air curtain generating device 4 includes a mounting plate 401, a second fan 402, and multiple nozzles 403. The second fan 402 is mounted on the mounting plate 401, and the multiple nozzles 403 are spaced apart on the mounting plate 401 along a first direction. The air inlet of the second fan 402 is connected to the air inlet duct 1, and the air outlet of the second fan 402 is connected to the nozzles 403, so that the nozzles 403 spray clean air to form an air curtain 5. A second electrically controlled valve is located between the second fan 402 and the air inlet duct 1.

[0041] Mounting plate 401 serves as the base for air curtain generator 4, used to fix the second fan 402 and nozzles 403. The second fan 402, located on mounting plate 401, generates air pressure to draw clean air from air inlet duct 1 and eject it through nozzles 403. Multiple nozzles 403 are spaced apart along a first direction on mounting plate 401 to eject the air generated by the second fan 402, forming an air curtain 5. A second electrically controlled valve is located between the second fan 402 and air inlet duct 1, used to control the airflow entering the second fan 402.

[0042] The design of multiple nozzles 403 can form a more uniform air curtain 5, effectively isolating dust and preventing its diffusion. The second electrically controlled valve allows for flexible adjustment of the airflow entering the second fan 402, thereby controlling the intensity and range of the air curtain 5. Through the design of the second fan 402 and nozzles 403, clean air can be delivered to the tunneling face 100 more effectively, improving ventilation efficiency. The air curtain generating device 4 can be adjusted according to different working face sizes and shapes to adapt to different ventilation needs.

[0043] In some embodiments, a first filter 12 is provided between the second fan 402 and the nozzle 403, and the first filter 12 is used to filter impurities in the clean air.

[0044] The filter installed between the second fan 402 and the nozzle 403 filters impurities from the clean air entering the nozzle 403. The filtered air is cleaner, which helps improve the isolation effect of the air curtain 5 and prevents dust from entering the work surface through the air curtain 5. The filter protects the nozzle 403 from damage by dust and other particles, extending its service life. Cleaner air allows for a more stable formation of the air curtain 5, reducing unevenness caused by impurities. The use of the filter reduces the maintenance frequency of the nozzle 403 and air curtain 5 system, lowering maintenance costs. Cleaner air helps reduce dust concentration at the work surface, reducing the risk of occupational diseases and safety accidents.

[0045] In some embodiments, the mounting plate 401 is provided with a humidity sensor and a wind speed sensor. The humidity sensor is used to monitor the humidity of the air curtain 5 and the wind speed of the air curtain 5.

[0046] A humidity sensor is used to monitor the humidity of air curtain 5, ensuring that the humidity of air curtain 5 is maintained within a suitable range. An anemometer is used to monitor the wind speed of air curtain 5, ensuring that the wind speed of air curtain 5 meets design requirements.

[0047] By monitoring the humidity and wind speed of the air curtain 5 in real time, the operating status of the air curtain generating device 4 can be adjusted promptly to maintain the optimal performance of the air curtain 5. Appropriate humidity and wind speed can improve the comfort of the working surface and reduce worker discomfort. Adjusting humidity and wind speed can maintain the stability and uniformity of the air curtain 5, improving its dust isolation effect. Appropriate humidity and wind speed help prevent static electricity buildup, reducing the risk of dust explosions. Monitoring and adjusting humidity and wind speed can avoid unnecessary energy waste, achieving energy conservation and emission reduction.

[0048] In some embodiments, such as Figure 2 As shown, a dryer 13 is installed between the dust removal device 6 and the air inlet duct 1. Dust in humid air may adhere to the dust removal equipment, reducing dust removal efficiency. The dryer 13 can remove moisture and improve the dust removal effect. Reducing air humidity can reduce the corrosion and damage of moisture to the dust removal equipment and extend its service life. Dry air helps prevent dust agglomeration, maintains dust flowability, and facilitates subsequent processing and discharge. Dry air can more effectively form the air curtain 5, improving the dust isolation effect. Reducing moisture can reduce the risk of dust explosion and improve workplace safety.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A coal mine tunneling face air curtain system, characterized in that, include: An air inlet duct (1) and an air outlet duct (2) are provided. The inlet of the air inlet duct (1) is used to communicate with clean air, and the outlet of the air inlet duct (1) is used to deliver clean air toward the tunneling face (100). The inlet of the air outlet duct (2) is provided with a first fan (3), which is used to introduce dusty air in the tunneling face (100) into the air outlet duct (2) and discharge it. An air curtain generating device (4) is provided in the tunneling face (100) and connected to the air intake duct (1) so that some clean air in the air intake duct (1) is transported to the air curtain generating device (4). The air curtain generating device (4) is used to generate an air curtain (5) to isolate the dust generated by the coal mining machine (200) during coal mining. A dust removal device (6) is provided in the tunneling face (100) and connected to the air outlet duct (2) and the air inlet duct (1). The dust removal device (6) is used to purify at least part of the dust-laden air in the air outlet duct (2) into clean air and deliver it to the air inlet duct (1) to compensate for the clean air delivered by the air inlet duct (1) to the air curtain generator (4).

2. The air curtain system for coal mine tunneling faces according to claim 1, characterized in that, The outlet of the air intake duct (1) is provided with a first electrically controlled air valve (7), which is used to control the flow rate of clean air delivered by the air intake duct (1) to the tunneling face (100).

3. The air curtain system for coal mine tunneling faces according to claim 2, characterized in that, A second electrically controlled air valve (8) is provided between the air inlet duct (1) and the air curtain generating device (4). The second electrically controlled air valve (8) is used to control the flow rate of clean air delivered from the air inlet duct (1) to the air curtain generating device (4).

4. The air curtain system for coal mine tunneling faces according to claim 3, characterized in that, A third electrically controlled air valve (9) is provided between the air outlet duct (2) and the dust removal device (6). The third electrically controlled air valve (9) is used to control the flow rate of dust-containing air delivered from the air outlet duct (2) to the dust removal device (6).

5. The air curtain system for coal mine tunneling faces according to claim 4, characterized in that, The system includes a gas concentration sensor (10), which is installed in the tunneling face (100) to detect the gas concentration of the tunneling face (100). The gas concentration sensor (10) is connected to the first blower (3), the first electrically controlled air valve (7), the second electrically controlled air valve (8), and the third electrically controlled air valve (9) through a controller. When the detected value of the gas concentration sensor (10) exceeds a first preset value, the controller controls the first blower (3) to increase its speed, the first electrically controlled air valve (7) to increase its opening, the second electrically controlled air valve (8) to decrease its opening, and the third electrically controlled air valve (9) to increase its opening.

6. The air curtain system for coal mine tunneling faces according to claim 5, characterized in that, The device includes a dust concentration sensor (11), which is installed in the tunneling face (100) to detect the dust concentration of the tunneling face (100). The dust concentration sensor (11) is connected to the first fan (3), the first electrically controlled air valve (7), the second electrically controlled air valve (8), and the third electrically controlled air valve (9) through a controller. When the detected value of the dust concentration sensor (11) exceeds a second preset value, the controller controls the first fan (3) to increase its speed, the first electrically controlled air valve (7) to decrease its opening, the second electrically controlled air valve (8) to increase its opening, and the third electrically controlled air valve (9) to increase its opening.

7. The air curtain system for coal mine tunneling faces according to claim 3, characterized in that, The air curtain generating device (4) includes a mounting plate (401), a second fan (402) and a plurality of nozzles (403). The second fan (402) is mounted on the mounting plate (401), and the plurality of nozzles (403) are spaced apart on the mounting plate (401) along a first direction. The air inlet of the second fan (402) is connected to the air inlet duct (1), and the air outlet of the second fan (402) is connected to the nozzles (403) so that the nozzles (403) spray clean air to form an air curtain (5). The second electrically controlled valve is located between the second fan (402) and the air inlet duct (1).

8. The air curtain system for coal mine tunneling faces according to claim 7, characterized in that, A first filter (12) is provided between the second fan (402) and the nozzle (403), and the first filter (12) is used to filter impurities in the clean air.

9. The air curtain system for coal mine tunneling faces according to claim 8, characterized in that, The mounting plate (401) is provided with a humidity sensor and a wind speed sensor. The humidity sensor is used to monitor the humidity of the air curtain (5) and the wind speed of the air curtain (5).

10. The air curtain system for coal mine tunneling faces according to claim 3, characterized in that, A dryer (13) is provided between the dust removal device (6) and the air inlet duct (1).

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