Double-windbreak automatic control device for adjusting oxygen concentration of upper corner

Abstract

The invention discloses an upper corner oxygen concentration adjusting double-windbreak automatic control device which comprises a PLC, an oxygen concentration monitoring array, a rough adjustment windbreak area assembly and a fine adjustment windbreak area assembly, the oxygen concentration monitoring array is arranged in an upper corner area, and the rough adjustment windbreak area assembly and the fine adjustment windbreak area assembly are both arranged in an open-off cut. The fine adjustment wind resistance area assembly is located between the coarse adjustment wind resistance area assembly and the upper corner, the signal output end of the oxygen concentration monitoring array is connected with the signal receiving end of the PLC, and the signal output end of the PLC is connected with the signal receiving end of the coarse adjustment wind resistance area assembly and the signal receiving end of the fine adjustment wind resistance area assembly. The wind resistance area can be automatically and finely adjusted according to field requirements, the intelligent degree of wind barrier setting parameters is improved, the problem of hypoxia of the upper corner is scientifically and efficiently solved, the safety of underground personnel is guaranteed, and a solid foundation is laid for safe production of a mine.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine safety production, and particularly relates to an automatic control device for double air barriers for regulating the oxygen concentration at the upper corner Background Technique

[0002] Regulations such as the Coal Mine Safety Regulations stipulate that when the oxygen concentration in the underground mining and excavation space is lower than 19.5%, it is a low-oxygen environment, which will form huge safety hazards. With the continuous increase in the depth and intensity of coal mine exploitation in China, affected by factors such as air leakage in the goaf and nitrogen injection in the goaf, the problem of low oxygen in the upper corner area of the U-shaped ventilation longwall face is prominent, which poses a hidden danger to the safety production of the mine. When treating the low-oxygen problem in the upper corner, the most commonly used treatment method in coal mines is the air barrier method, which is to arrange a transverse air barrier near the return air side in the open-off cut of the working face. The function of setting this air barrier is, on the one hand, to introduce fresh air flow into the upper corner area of the working face, improve the air flow intensity in the upper corner of the working face, and then effectively dilute and carry away the low-oxygen gas accumulated in this area by the fresh air flow; on the other hand, it can significantly increase the air flow pressure in the area from the intake airway to the windward side of the air barrier, thereby playing a role in preventing the high-concentration low-oxygen gas in the goaf from flowing into the upper corner area. The existing air barrier setting method has a certain effect on solving the low-oxygen problem in the upper corner, but some problems have also been exposed in the actual application process of this method, which are specifically manifested as follows: (1) The safety of the existing air barriers is poor, and there are safety hazards in the use process. The air barrier facilities used in coal mines are all simple types, made of materials such as air duct cloth and canvas, and adopt a suspended design, that is, one end of the air barrier is fixed to the side of the top beam of the support, and the other end is connected to the wire mesh on the roof through iron wire. If the hanging iron wire fixing the air barrier becomes loose and falls off, or the coal wall spalls due to the action of ground stress, problems such as the air barrier falling off and air flow disorder will occur. The on-site staff need to stand on the scraper conveyor to deal with the damaged air barrier. This will not only exacerbate the air flow disorder in the working face and is not conducive to safety production, but also directly expose the underground personnel to the potential danger of the coal wall in the working face spalling again, which undoubtedly greatly increases the risk of personal safety accidents and poses a serious threat to the overall safety of the mine.

[0003] (2) The existing simple air barriers only have a single air resistance area and cannot automatically adjust the air resistance area according to the on-site needs. When the working face conditions change, in order to avoid the occurrence of low-oxygen problems in the upper corner, it is necessary to manually adjust the air resistance area of the air barrier, which is time-consuming and laborious and extremely inconvenient.

[0004] (3) The degree of intelligence of the air barrier setting parameters is relatively low, and the scientificity of solving the low-oxygen problem in the upper corner is relatively poor. The adjustment of the air barrier resistance area mainly depends on the experience judgment of underground personnel, lacking scientificity and accuracy. This method cannot ensure that the adjusted air barrier resistance area can achieve the best treatment effect for the low-oxygen problem in the upper corner, and may even exacerbate the problem of over-limit in the upper corner.

[0005] (4) The existing basis for adjusting the air barrier is the measured value of an oxygen concentration sensor suspended in the upper corner area. However, relying solely on the measured value of a single oxygen concentration sensor to judge whether there is a low-oxygen problem in the upper corner area, whether the air barrier needs to be adjusted, and the air barrier adjustment parameters, there are problems such as poor reliability of the oxygen concentration measurement value, inability to comprehensively reflect the actual situation of the low-oxygen problem in the upper corner, resulting in misjudgment, and leading to the defect of unreasonable air barrier adjustment parameters, which may exacerbate the low-oxygen problem in the upper corner.

[0006] Therefore, it is necessary to develop an air barrier adjustment device that automatically controls the oxygen concentration in the upper corner. This device can automatically adjust the air barrier resistance area according to the oxygen concentration in the upper corner, safely, scientifically, efficiently, and can solve the low-oxygen problem in the upper corner by coarsely and finely adjusting the air volume; at the same time, it can avoid the danger brought to underground personnel by adjusting the air barrier, laying a solid foundation for the safe production of the mine. Summary of the Invention

[0007] In order to solve the frequent low-oxygen problems in the upper corner area and the deficiencies existing in the use of simple air barriers, the present invention provides a double air barrier automatic control device for adjusting the oxygen concentration in the upper corner, which can achieve the purpose of intelligently adjusting the air barrier resistance area according to the oxygen concentration in the upper corner, and effectively solve the safety hazards brought by the low-oxygen problem in the upper corner.

[0008] To achieve the above object, the present invention adopts the following technical solutions: The double air barrier automatic control device for adjusting the oxygen concentration in the upper corner includes a PLC controller, an oxygen concentration monitoring array, a coarse adjustment air barrier resistance area component, and a fine adjustment air barrier resistance area component. The oxygen concentration monitoring array is arranged in the upper corner area, the coarse adjustment air barrier resistance area component and the fine adjustment air barrier resistance area component are both arranged in the open-off cut, the fine adjustment air barrier resistance area component is located between the coarse adjustment air barrier resistance area component and the upper corner, the signal output end of the oxygen concentration monitoring array is connected to the signal receiving end of the PLC controller, and the signal output end of the PLC controller is respectively connected to the signal receiving ends of the coarse adjustment air barrier resistance area component and the fine adjustment air barrier resistance area component.

[0009] The coarse adjustment air resistance area assembly includes a first explosion-proof motor, a lead screw, an internal thread sleeve, a connecting rod mechanism, and a first air barrier. The main shaft of the first explosion-proof motor is coaxially driven and connected to one end of the lead screw through a first coupling. The lead screw is horizontally arranged and the length direction of the lead screw is perpendicular to the length direction of the open-off cut. The internal thread sleeve is threadedly connected to the lead screw. A connecting block is provided at the other end of the lead screw. A fixed rod parallel to the lead screw is fixedly provided on the side of the connecting block. A first fixed block is provided on the top of the first explosion-proof motor, and a second fixed block is provided on the top of the fixed rod. The tops of the first fixed block and the second fixed block are both fixed to the top end of the hydraulic support through stainless steel clamps. One end of the fixed rod and the internal thread sleeve are connected to the upper side of the first air barrier through the connecting rod mechanism. A counterweight block is fixedly provided on the lower side of the first air barrier.

[0010] The connecting rod mechanism includes a connecting rod and a first hanging cross bar. The center lines of the connecting rod, the first hanging cross bar, the lead screw, and the fixed rod are located on the same horizontal plane. One end of the connecting rod is connected to the side of the internal thread sleeve through a first hinge, and the other end of the connecting rod is connected to one end of the first hanging cross bar through a second hinge. The other end of the first hanging cross bar is connected to the end of the fixed rod adjacent to the connecting block through a third hinge. The upper side of the first air barrier is fixedly connected to the first hanging cross bar.

[0011] The oxygen concentration monitoring array includes a number of oxygen concentration sensors. The number of oxygen concentration sensors are arranged in a rectangular array in the upper corner area. The number of oxygen concentration sensors are arranged in the upper corner area at a position not more than 30 cm close to the roof. Each oxygen concentration sensor transmits the oxygen concentration data of the upper corner area it monitors to the PLC controller. The PLC controller comprehensively judges the oxygen concentration of each monitor through the built-in dynamic trend analysis algorithm, and automatically determines the oxygen concentration distribution in the upper corner area.

[0012] The fine adjustment air resistance area assembly includes a second explosion-proof motor, a winding rod, a second hanging cross bar, and a second air barrier. The length directions of the winding rod and the second hanging cross bar are both perpendicular to the length direction of the open-off cut. The winding rod is located above the second hanging cross bar. The second explosion-proof motor is arranged on the upper part of one end of the second hanging cross bar. Both ends of the winding rod are rotatably connected to the second hanging cross bar through bearing seats. The main shaft of the second explosion-proof motor is coaxially driven and connected to one end of the winding rod through a second coupling. Third fixed blocks are provided on the tops of both bearing seats, and the third fixed blocks are fixed to the top end of the hydraulic support through stainless steel clamps. The upper side of the second air barrier is fixedly connected to the second hanging cross bar, and the lower side of the second air barrier is fixedly connected to the bottom of the hydraulic support. A number of air vents arranged in a rectangular array are provided on the second air barrier. A wind volume adjustment mechanism for controlling the size of the air vents is connected to the winding rod.

[0013] A number of air volume adjusting mechanisms are arranged at intervals along the length direction of the wire winding rod. Each group of air volume adjusting mechanisms includes a pulling rope and a number of adjusting plates arranged at intervals vertically. Each adjusting plate is arranged corresponding to a ventilation opening. The upper part of the pulling rope is wound around the wire winding rod. The lower side edge of each adjusting plate is rotatably connected to the leeward surface of the second wind barrier through a hinge. Each hinge is located at the lower side edge of the corresponding ventilation opening. The upper parts of the adjusting plates are all connected to the pulling rope.

[0014] A partition board is arranged between adjacent two pulling ropes on the wire winding rod.

[0015] Both the adjusting plate and the ventilation opening are triangular. The area of the adjusting plate is larger than that of the ventilation opening. The upper part of the adjusting plate is connected to the pulling rope through a wire rope buckle.

[0016] With the above technical solution, the upper corner is located at the intersection of the return airway and the open-off cut. The air flow direction in the roadway is: intake airway → open-off cut → upper corner → return airway. In the present invention, a double air barrier structure for regulating the oxygen concentration is arranged inside the open-off cut, including a coarse-tuning air resistance area component and a fine-tuning air resistance area component. An oxygen concentration monitoring array (including several oxygen concentration sensors arranged in an array) is arranged inside the upper corner area. Each oxygen concentration sensor transmits the oxygen concentration data monitored in the upper corner area to the PLC controller. The PLC controller comprehensively judges the signals of each oxygen concentration sensor through the built-in dynamic trend analysis algorithm. When the judgment result shows that the oxygen concentration in the upper corner area is lower than the set lower threshold or threatens the safety of underground workers, and it is necessary to increase the fresh air flow in the upper corner area to increase the oxygen concentration in this area, the PLC controller sends a start signal to the first explosion-proof motor and the second explosion-proof motor. The first explosion-proof motor drives the lead screw to rotate forward through the first coupling. The internally threaded sleeve threadedly connected to the lead screw moves along the axial direction of the lead screw as the lead screw rotates. The internally threaded sleeve drives the first hanging crossbar and the first air barrier to approach the first explosion-proof motor through the connecting rod, so that the angle between the first hanging crossbar and the fixed rod becomes smaller, and the air flow channel between the vertical side of the first air barrier adjacent to the second hinge and the side wall of the open-off cut gradually increases, and the air flows towards the second air barrier. The second explosion-proof motor started simultaneously with the first explosion-proof motor drives the winding rod to rotate forward through the second coupling, and the pulling rope on the winding rod slowly relaxes. Under the combined action of the self-weight of the regulating plate and the wind pressure on the regulating plate, the regulating plates of multiple air volume regulating mechanisms are rotated downward around the hinge at the same time, and the air vents are opened, and fresh air quickly enters the upper corner through the air vents, supplementing the fresh air in the upper corner area and eliminating the low-oxygen problem in this area. When the oxygen concentration in the upper corner decreases and the oxygen concentration sensor monitors that the oxygen concentration in the upper corner area reaches the set lower threshold, a signal is sent to the PLC controller, and the PLC controller commands the first explosion-proof motor and the second explosion-proof motor to shut down; as the fresh air flow continuously dilutes the low-oxygen gas in the upper corner, when the oxygen concentration sensor monitors that the oxygen concentration in the upper corner area reaches the set upper threshold, a signal is sent to the PLC controller, and the PLC controller commands the first explosion-proof motor and the second explosion-proof motor to start. The first explosion-proof motor rotates in the reverse direction, driving the lead screw to rotate. The internally threaded sleeve threadedly connected to the lead screw moves along the lead screw close to the connecting block as the lead screw rotates. The internally threaded sleeve drives the first hanging crossbar and the first air barrier to rotate with the third hinge as the fulcrum. The angle between the first hanging crossbar and the fixed rod becomes larger, and the air flow channel between the vertical side of the first air barrier adjacent to the second hinge and the side wall of the open-off cut gradually decreases, and the first air barrier blocks the air flow; the second explosion-proof motor started simultaneously with the first explosion-proof motor drives the winding rod to rotate in the reverse direction through the second coupling, and the pulling rope is wound around the winding rod. The pulling rope simultaneously pulls and rotates the regulating plates of multiple air volume regulating mechanisms upward around the hinge, and the air vents are slowly reduced, and a smaller air flow passes through the air vents and enters the upper corner and the return airway.According to the above process, each oxygen concentration sensor monitors the oxygen concentration in the upper corner in real time. The PLC controller uses the built-in dynamic trend analysis algorithm to comprehensively judge the data collected by each oxygen concentration sensor in the oxygen concentration monitoring matrix, and transmits the judgment result to the PLC controller. The PLC controller controls the opening and closing of the first explosion-proof motor and the second explosion-proof motor, so as to adjust the air resistance area of the open-off cut by the coarse air resistance area adjustment component and the fine air resistance area adjustment component, and then adjust the air volume entering the upper corner area, effectively solving the problem of low oxygen in the upper corner to ensure the safety of the upper corner.

[0017] The coarse air resistance area adjustment component uses the first explosion-proof motor to drive the internal thread sleeve to axially move on the lead screw, drives the connecting rod to rotate through the third hinge by the internal thread sleeve, and then drives the first hanging cross bar and the first air barrier to adjust the air resistance of the open-off cut cross section. The counterweight block ensures that the first air barrier remains vertical, thereby improving the air volume adjustment effect.

[0018] The fine air resistance area adjustment component uses the second explosion-proof motor to drive the wire winding rod to rotate, so that the pulling rope wound on the wire winding rod rotates vertically for a plurality of vertically arranged triangular air volume adjustment plates to adjust the ventilation area of the ventilation port, and then realizes the fine adjustment of the air volume entering the upper corner.

[0019] In summary, through the mutual cooperation of the oxygen concentration monitoring array, the PLC controller, the coarse air resistance area adjustment component and the fine air resistance area adjustment component, the device can automatically adjust the air resistance area according to the on-site needs. Through the double fine adjustment of the coarse air resistance area and the fine air resistance area, the intelligent degree of the air barrier setting parameters is improved, and the problem of low oxygen in the upper corner is solved safely, scientifically and efficiently. At the same time, it can also ensure the safety of underground personnel and lay a solid foundation for the safe production of the mine. Brief Description of the Drawings

[0020] Figure 1 is the floor plan of the present invention; Figure 2 is Figure 1 the specific structure diagram of the coarse air resistance area adjustment component in Figure 3 is Figure 2 the view in the direction of A in Figure 4 is Figure 1 the specific structure diagram of the fine air resistance area adjustment component in Figure 5 is Figure 1 the layout diagram of several oxygen concentration sensors in the upper corner in Detailed Description of the Invention

[0021] As Figure 1-5As shown in the figure, the automatic control device for regulating the oxygen concentration at the upper corner of the invention includes a PLC controller 1, an oxygen concentration monitoring array 2, a coarse adjustment air resistance area component 3, and a fine adjustment air resistance area component 4. The oxygen concentration monitoring array 2 is arranged in the upper corner 5 area, and both the coarse adjustment air resistance area component 3 and the fine adjustment air resistance area component 4 are arranged in the open-off cut 6. The fine adjustment air resistance area component 4 is located between the coarse adjustment air resistance area component 3 and the upper corner 5. The signal output end of the oxygen concentration monitoring array 2 is connected to the signal receiving end of the PLC controller 1, and the signal output end of the PLC controller 1 is respectively connected to the signal receiving ends of the coarse adjustment air resistance area component 3 and the fine adjustment air resistance area component 4.

[0022] The coarse adjustment air resistance area component 3 includes a first explosion-proof motor 7, a lead screw 8, an internal thread sleeve 9, a connecting rod mechanism, and a first air barrier 10. The main shaft of the first explosion-proof motor 7 is coaxially driven and connected to one end of the lead screw 8 through a first coupling 11. The lead screw 8 is horizontally arranged and the length direction of the lead screw 8 is perpendicular to the length direction of the open-off cut 6. The internal thread sleeve 9 is threadedly connected to the lead screw 8. A connecting block 12 is provided at the other end of the lead screw 8. A fixed rod 13 parallel to the lead screw 8 is fixedly provided on the side of the connecting block 12. A first fixed block 14 is provided on the top of the first explosion-proof motor 7, and a second fixed block 15 is provided on the top of the fixed rod 13. The tops of the first fixed block 14 and the second fixed block 15 are both fixed to the top end of the hydraulic support through stainless steel clamps. One end of the fixed rod 13 and the internal thread sleeve 9 are connected to the upper side edge of the first air barrier 10 through the connecting rod mechanism, and a counterweight block 16 is fixedly provided on the lower side edge of the first air barrier 10.

[0023] The connecting rod mechanism includes a connecting rod 17 and a first hanging cross bar 18. The center lines of the connecting rod 17, the first hanging cross bar 18, the lead screw 8, and the fixed rod 13 are located on the same horizontal plane. One end of the connecting rod 17 is connected to the side of the internal thread sleeve 9 through a first hinge 19. The other end of the connecting rod 17 is connected to one end of the first hanging cross bar 18 through a second hinge 20. The other end of the first hanging cross bar 18 is connected to the end of the fixed rod 13 adjacent to the connecting block 12 through a third hinge 21. The upper side edge of the first air barrier 10 is fixedly connected to the first hanging cross bar 18.

[0024] The oxygen concentration monitoring array 2 includes a plurality of oxygen concentration sensors 22. The plurality of oxygen concentration sensors 22 are arranged in a matrix at the upper corner 5. The plurality of oxygen concentration sensors 22 are arranged at a position not more than 30 cm close to the roof in the upper corner 5 area. Each oxygen concentration sensor 22 monitors the oxygen concentration in the upper corner 5 area in real time and transmits the monitoring signal to the PLC controller 1 in real time. The PLC controller 1 comprehensively judges the oxygen concentration distribution in the upper corner 5 area according to the data of the plurality of oxygen concentration sensors 22.

[0025] The fine-tuning wind resistance area assembly 4 includes a second explosion-proof motor 23, a winding rod 24, a second hanging cross bar 25, and a second wind barrier 26. The length directions of the winding rod 24 and the second hanging cross bar 25 are perpendicular to the length direction of the opening eye 6. The winding rod 24 is located above the second hanging cross bar 25. The second explosion-proof motor 23 is arranged at the upper part of one end of the second hanging cross bar 25. The two ends of the winding rod 24 are rotatably connected to the second hanging cross bar 25 through the bearing seat 27. The main shaft of the second explosion-proof motor 23 is connected to the second hanging cross bar 25 through the second coupling. The shaft 28 is coaxially connected to one end of the winding rod 24, and a third fixing block 29 is provided on the top of the two bearing seats 27. The two third fixing blocks 29 are fixed to the top of the hydraulic support through stainless steel clamps. The upper side of the second wind barrier 26 is fixedly connected to the second hanging cross bar 25, and the lower side of the second wind barrier 26 is fixedly connected to the bottom of the hydraulic support. The second wind barrier 26 is provided with a plurality of air vents arranged in a rectangular array, and the winding rod 24 is connected to an air volume adjustment mechanism for controlling the size of the air vents.

[0026] Several groups of air volume regulating mechanisms are arranged at intervals along the length direction of the winding rod 24, and each group of air volume regulating mechanisms includes a pulling rope 30 and several adjusting plates 31 arranged at intervals vertically. Each adjusting plate 31 is arranged corresponding to an air vent. The upper part of the pulling rope 30 is wound around the winding rod 24, and the lower side of each adjusting plate 31 is rotatably connected to the leeward side of the second wind barrier 26 through a hinge 32. Each hinge 32 is located at the lower side of the corresponding air vent, and the upper part of the adjusting plate 31 is connected to the pulling rope 30.

[0027] A partition plate 33 is provided between two adjacent pulling ropes 30 on the winding rod 24 .

[0028] The adjustment plate 31 and the air vent are both triangular in shape. The area of ​​the adjustment plate 31 is larger than that of the air vent. The upper portion of the adjustment plate 31 is connected to the pulling rope 30 via a wire rope buckle 34 .

[0029] The upper corner 5 is located at the intersection of the return airway 35 and the cutting roadway 6. The air flow direction in the roadway is: intake airway 36 → cutting roadway 6 → upper corner 5 → return airway 35. In the present invention, a double air barrier structure for oxygen concentration adjustment is arranged inside the cutting roadway 6, including a coarse adjustment air resistance area component 3 and a fine adjustment air resistance area component 4. An oxygen concentration monitoring array 2 (including a number of oxygen concentration sensors 22 arranged in an array) is arranged inside the upper corner 5 area. Each oxygen concentration sensor 22 transmits the monitored oxygen concentration data of the upper corner 5 area to the PLC controller 1. The PLC controller 1 makes a comprehensive judgment on the signals of each oxygen concentration sensor 22 through the built-in dynamic trend analysis algorithm. When the judgment result shows that the oxygen concentration in the upper corner 5 area is lower than the set lower threshold or threatens the safety of underground workers, and it is necessary to increase the fresh air flow in the upper corner 5 area to increase the oxygen concentration in this area, the PLC controller 1 sends a start signal to the first explosion-proof motor 7 and the second explosion-proof motor 23. The first explosion-proof motor 7 drives the lead screw 8 to rotate forward through the first coupling 11. The internal thread sleeve 9 threaded on the lead screw 8 moves along the axial direction of the lead screw 8 as the lead screw 8 rotates. The internal thread sleeve 9 drives the first hanging cross bar 18 and the first air barrier 10 to approach the first explosion-proof motor 7 through the connecting rod 17, so that the angle between the first hanging cross bar 18 and the fixed rod 13 becomes smaller, and the air flow channel between the vertical side of the first air barrier 10 adjacent to the second hinge 20 and the side wall of the cutting roadway 6 gradually increases, and the air flows to the second air barrier 26. The second explosion-proof motor 23 started simultaneously with the first explosion-proof motor 7 drives the winding rod 24 to rotate forward through the second coupling 28, and the pulling rope 30 on the winding rod 24 slowly relaxes. Under the combined action of the self-weight of the adjusting plate 31 and the wind pressure on the adjusting plate 31, the adjusting plates 31 of a plurality of air volume adjusting mechanisms rotate downward around the hinge 32 at the same time, and the air vents are opened. Fresh air flows through the air vents and quickly enters the upper corner 5 to supplement the fresh air in the upper corner 5 area and eliminate the low-oxygen problem in this area.The oxygen concentration at the upper corner 5 decreases. When the oxygen concentration sensor 22 detects that the oxygen concentration in the area of the upper corner 5 reaches the set lower threshold, it sends a signal to the PLC controller 1. The PLC controller 1 commands the first explosion-proof motor 7 and the second explosion-proof motor 23 to shut down. As the air flow continuously dilutes the low-oxygen gas in the upper corner 5, when the oxygen concentration sensor 22 detects that the oxygen concentration in the upper corner area 5 reaches the set upper threshold, it sends a signal to the PLC controller 1. The PLC controller 1 commands the first explosion-proof motor 7 and the second explosion-proof motor 23 to start. The first explosion-proof motor 7 rotates in the reverse direction, driving the lead screw 8 to rotate. The internal thread sleeve 9 threadedly connected to the lead screw 8 moves along the lead screw 8 close to the connecting block 12 as the lead screw 8 rotates. The internal thread sleeve 9 drives the first hanging cross bar 18 and the first air barrier 10 to rotate with the third hinge 21 as the fulcrum through the connecting rod 17. The included angle between the first hanging cross bar 18 and the fixed rod 13 becomes larger, and the air flow channel between the vertical side of the first air barrier 10 adjacent to the second hinge 20 and the side wall of the starting cut 6 gradually decreases. The first air barrier 10 blocks the air flow. The second explosion-proof motor 23 started simultaneously with the first explosion-proof motor 7 drives the winding rod 24 to rotate in the reverse direction through the second coupling 28, and the pulling rope 30 winds around the winding rod 24. The pulling rope 30 simultaneously pulls up and rotates the adjusting plates 31 of multiple air volume adjusting mechanisms with the hinge 32 as the center, and the air vents are slowly narrowed. A smaller air flow passes through the air vents and enters the upper corner 5 and the return airway 35. According to the above process, each oxygen concentration sensor 22 monitors the oxygen concentration at the upper corner 5 in real time. The PLC controller 1 uses the built-in dynamic trend analysis algorithm to comprehensively judge the data collected by each oxygen concentration sensor in the oxygen concentration monitoring matrix, and transmits the judgment result to the PLC controller 1. The PLC controller 1 controls the opening and closing of the first explosion-proof motor 7 and the second explosion-proof motor 23, so as to adjust the air resistance area of the thick and fine air resistance area components 4 and the fine air resistance area component 4 for the air passing through the starting cut 6, and then adjust the air volume, effectively solving the problem of low oxygen in the upper corner and ensuring the safety of the upper corner 5.

[0030] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; still can modify the present invention or make equivalent replacements, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. Double air barrier automatic control device for regulating oxygen concentration at the upper corner, characterized in that: It includes a PLC controller, an oxygen concentration monitoring array, a coarse air resistance area adjusting component, and a fine air resistance area adjusting component. The oxygen concentration monitoring array is arranged in the upper corner area. Both the coarse air resistance area adjusting component and the fine air resistance area adjusting component are arranged in the open-off cut. The fine air resistance area adjusting component is located between the coarse air resistance area adjusting component and the upper corner. The signal output end of the oxygen concentration monitoring array is connected to the signal receiving end of the PLC controller. The signal output end of the PLC controller is respectively connected to the signal receiving ends of the coarse air resistance area adjusting component and the fine air resistance area adjusting component.

2. The automatic control device for double air barriers for adjusting the oxygen concentration at the upper corner, according to claim 1, is characterized in that: The coarse air resistance area adjusting component includes a first explosion-proof motor, a lead screw, an internally threaded sleeve, a linkage mechanism, and a first air barrier. The main shaft of the first explosion-proof motor is coaxially driven and connected to one end of the lead screw through a first coupling. The lead screw is horizontally arranged and the length direction of the lead screw is perpendicular to the length direction of the open-off cut. The internally threaded sleeve is threadedly connected to the lead screw. A connecting block is provided at the other end of the lead screw. A fixed rod parallel to the lead screw is fixedly provided on the side of the connecting block. A first fixed block is provided on the top of the first explosion-proof motor. A second fixed block is provided on the top of the fixed rod. The tops of the first fixed block and the second fixed block are both fixed to the top end of the hydraulic support through stainless steel clamps. One end of the fixed rod and the internally threaded sleeve are connected to the upper side of the first air barrier through the said linkage mechanism. A counterweight block is fixedly provided on the lower side of the first air barrier.

3. The automatic control device for double air barriers for regulating the oxygen concentration at the upper corner, according to claim 2, is characterized in that: The linkage mechanism includes a connecting rod and a first hanging cross bar. The center lines of the connecting rod, the first hanging cross bar, the lead screw, and the fixed rod are located on the same horizontal plane. One end of the connecting rod is connected to the side of the internally threaded sleeve through a first hinge. The other end of the connecting rod is connected to one end of the first hanging cross bar through a second hinge. The other end of the first hanging cross bar is connected to one end of the fixed rod adjacent to the connecting block through a third hinge. The upper side of the first air barrier is fixedly connected to the first hanging cross bar.

4. The automatic control device for double air barriers to adjust the oxygen concentration at the upper corner, according to claim 1, wherein: The oxygen concentration monitoring array includes a number of oxygen concentration sensors. The number of oxygen concentration sensors are arranged in the upper corner area in the form of a rectangular array. The number of oxygen concentration sensors are arranged in the upper corner area at a position not more than 30 cm close to the roof. Each oxygen concentration sensor transmits the oxygen concentration data of the monitored upper corner area to the PLC controller. The PLC controller comprehensively judges the oxygen concentration of each monitor through the built-in dynamic trend analysis algorithm, and automatically determines the oxygen concentration distribution in the upper corner area.

5. The automatic control device for double air barriers for regulating the oxygen concentration at the upper corner, according to claim 1, is characterized in that: The fine-tuning air resistance area component includes a second explosion-proof motor, a winding rod, a second hanging crossbar, and a second air barrier. The length directions of the winding rod and the second hanging crossbar are both perpendicular to the length direction of the open-off cut. The winding rod is located above the second hanging crossbar. The second explosion-proof motor is arranged on the upper part of one end of the second hanging crossbar. Both ends of the winding rod are rotatably connected to the second hanging crossbar through bearing seats. The main shaft of the second explosion-proof motor is coaxially connected to one end of the winding rod through a second coupling. Third fixing blocks are provided at the tops of both bearing seats, and the third fixing blocks are fixed to the top end of the hydraulic support through stainless steel clamps. The upper side of the second air barrier is fixedly connected to the second hanging crossbar, and the lower side of the second air barrier is fixedly connected to the bottom of the hydraulic support. A number of air vents arranged in a rectangular array are provided on the second air barrier. A wind volume adjustment mechanism for controlling the size of the air vents is connected to the winding rod.

6. The automatic control device for double air barriers for adjusting the oxygen concentration at the upper corner according to claim 5, wherein: Several groups of the wind volume adjustment mechanism are arranged at intervals along the length direction of the winding rod. Each group of the wind volume adjustment mechanism includes a pulling rope and several adjusting plates arranged vertically at intervals. Each adjusting plate corresponds to one air vent. The upper part of the pulling rope is wound around the winding rod. The lower side of each adjusting plate is rotatably connected to the leeward side of the second air barrier through a hinge. Each hinge is located at the lower side of the corresponding air vent. The upper parts of the adjusting plates are all connected to the pulling rope.

7. The automatic control device for double air barriers for regulating the oxygen concentration at the upper corner, according to claim 5, wherein: A partition board is provided between adjacent two pulling ropes on the winding rod.

8. The automatic control device for double air barriers for regulating the oxygen concentration at the upper corner, according to claim 5, wherein: Both the adjusting plate and the air vent are triangular. The area of the adjusting plate is larger than that of the air vent. The upper part of the adjusting plate is connected to the pulling rope through a steel wire rope buckle.

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