Upper corner oxygen concentration electric adjusting device

Abstract

The utility model discloses an upper corner oxygen concentration electric adjusting device which comprises a PLC, an oxygen concentration monitoring array and a wind barrier electric adjusting assembly, the oxygen concentration monitoring array is arranged in an upper corner area, and the wind barrier electric adjusting assembly is arranged in an open-off cut and is close to an 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 wind barrier electric adjusting assembly. Through mutual cooperation of the oxygen concentration monitoring array, the PLC and the wind barrier electric adjusting assembly, the wind resistance area can be automatically adjusted according to field requirements, the automation degree of wind barrier setting is improved by adjusting the wind resistance area in the open-off cut, the problem of low oxygen of the upper corner is safely, scientifically and efficiently solved, and the wind barrier is high in practicability. Meanwhile, the safety of underground personnel can be guaranteed, and a solid foundation is laid for safe production of a mine.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine safety production technology, specifically relating to an electric regulating device for oxygen concentration in the upper corner. Background Technology

[0002] With the continuous increase in the depth and intensity of coal mining in my country, the problem of low oxygen in the upper corner of U-shaped ventilation longwall faces has become prominent, posing a hidden danger to mine safety. The most commonly used method for addressing low oxygen in the upper corner of coal mines is the air barrier method, which involves placing a transverse air barrier near the return air side within the face cut. The purpose of this air barrier is twofold: firstly, it introduces fresh air into the upper corner of the face, increasing the airflow intensity and effectively diluting and carrying away the accumulated low-oxygen gas; secondly, it significantly increases the pressure in the area from the intake airway to the windward side of the air barrier, thus preventing high-concentration methane from flowing into the upper corner from the goaf. While some current air barrier installation methods have some effect on solving the low oxygen problem in the upper corner, this method has also revealed some problems in actual underground use, as follows:

[0003] (1) The existing ventilation barriers are not very safe and pose safety hazards during use. The ventilation barriers used in underground coal mines are all simple types, made of materials such as ventilation duct cloth and canvas, and are designed to be suspended. One end of the ventilation barrier is fixed to the side of the top beam of the support, while the other end is connected to the steel mesh on the roof by wire. If the suspension wire that fixes the ventilation barrier becomes loose and falls off, or if the coal wall collapses due to ground stress, it will lead to problems such as ventilation barrier falling off and airflow turbulence. On-site workers will have to stand on the scraper conveyor to pull the ventilation barrier out, which will not only aggravate the airflow turbulence at the working face and be detrimental to safe production, but will also directly expose the underground personnel to the potential danger of further collapse of the coal wall at the working face. This undoubtedly greatly increases the risk of personal safety accidents and poses a serious threat to the overall safety of the mine.

[0004] (2) The existing simple windbreaks only have a single wind resistance area and cannot automatically adjust the wind resistance area according to the needs of the site. When the air volume of the working face cut changes, in order to avoid the oxygen concentration in the upper corner being low, the wind resistance area of ​​the windbreak needs to be manually adjusted. This process is time-consuming, laborious and extremely inconvenient.

[0005] (3) The intelligent level of the wind barrier setting parameters is low, and the scientific method for solving the low oxygen problem in the upper corner is poor. The adjustment of the wind barrier resistance area mainly relies on the experience judgment of the downhole personnel, which lacks scientificity and precision. This method cannot ensure that the adjusted wind barrier resistance area can achieve the best treatment effect for the low oxygen problem in the upper corner, and may even aggravate the problem of exceeding the limit in the upper corner.

[0006] Therefore, it is necessary to develop an automatic ventilation barrier device for controlling oxygen concentration in the upper corner of the mine. This device can automatically adjust the wind resistance area of ​​the ventilation barrier based on the oxygen concentration in the upper corner, scientifically and efficiently solving the problem of low oxygen in the upper corner. At the same time, it can avoid the dangers caused to underground personnel by adjusting the ventilation barrier, laying a solid foundation for safe production in the mine. Utility Model Content

[0007] To address the shortcomings of existing simple windbreaks during use, this invention provides an electric adjustment device for oxygen concentration in the upper corner, which can automatically adjust the windbreak's wind resistance area based on the oxygen concentration in the upper corner, effectively solving the problem of low oxygen in the upper corner.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an electric adjustment device for oxygen concentration at the upper corner, comprising a PLC controller, an oxygen concentration monitoring array, and an electric adjustment component for the windbreak. The oxygen concentration monitoring array is located at the upper corner, and the electric adjustment component for the windbreak is located inside the cut and adjacent to the upper corner. The upper end of the electric adjustment component for the windbreak is connected to the upper end of the hydraulic support, and the lower end of the electric adjustment component for the windbreak is connected to a counterweight. The signal output terminal of the oxygen concentration monitoring array is connected to the signal receiving terminal of the PLC controller, and the signal output terminal of the PLC controller is connected to the signal receiving terminal of the electric adjustment component for the windbreak.

[0009] The windbreak electric adjustment assembly includes an explosion-proof motor, a lead screw, an internal threaded sleeve, a linkage mechanism, and a windbreak. The main shaft of the explosion-proof motor is coaxially connected to one end of the lead screw via a coupling. The lead screw is horizontally positioned with its length direction perpendicular to the length direction of the cut eye. The internal threaded sleeve is threaded onto the lead screw. A connecting block is provided at the other end of the lead screw. A fixing rod parallel to the lead screw is fixed to the side of the connecting block. A first fixing block is provided on the top of the explosion-proof motor, and a second fixing block is provided on the top of the fixing rod. The tops of the first and second fixing blocks are both fixed to the top of the hydraulic support by stainless steel clamps. One end of the fixing rod and the internal threaded sleeve are connected to the upper side of the windbreak through the linkage mechanism. At least three counterweights are provided, and all counterweights are evenly distributed along the lower side of the windbreak. The signal output terminal of the PLC controller is connected to the signal receiving terminal of the explosion-proof motor.

[0010] The linkage mechanism includes a connecting rod and a suspension crossbar. The center lines of the connecting rod, the suspension crossbar, 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 threaded sleeve through a first hinge, and the other end of the connecting rod is connected to one end of the suspension crossbar through a second hinge. The other end of the suspension crossbar is connected to one end of the fixed rod adjacent to the connecting block through a third hinge. The upper side of the windbreak is fixedly connected to the suspension crossbar.

[0011] The oxygen concentration monitoring array includes several oxygen concentration sensors, which are arranged in a rectangular array in the upper corner area. The oxygen concentration sensors are located no more than 30cm from the top plate in 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 sends a command to the windbreak electric adjustment component to adjust the wind resistance area.

[0012] Using the above technical solution, the upper corner is located at the junction of the return airway and the opening cut. The airflow direction in the roadway is: intake airway → opening cut → upper corner → return airway. An oxygen concentration monitoring array (including several arrayed oxygen concentration sensors) is installed inside the upper corner area. When the oxygen concentration sensor detects that the oxygen concentration in the upper corner area is lower than the set upper threshold, threatening the safety of underground personnel, the oxygen concentration sensor transmits the monitored information to the PLC controller. The PLC controller sends a start command to the explosion-proof motor. The explosion-proof motor drives the lead screw to rotate forward through the coupling. The internal threaded sleeve, which is threaded onto the lead screw, moves along the lead screw axis as the lead screw rotates. The internal threaded sleeve drives the hanging crossbar and the air barrier to approach the explosion-proof motor through the connecting rod, thereby reducing the angle between the hanging crossbar and the fixed rod. The airflow channel between the vertical side of the air barrier near the second hinge and the side wall of the opening cut gradually increases. Fresh air flows through this vertical airflow channel to the upper corner, replenishing the fresh air in the upper corner area and eliminating the low oxygen problem in this area. As the oxygen concentration in the upper corner decreases, when the oxygen concentration sensor detects that the oxygen concentration in the upper corner area has reached the set lower threshold, it sends a signal to the PLC controller. The PLC controller then commands the explosion-proof motor to shut down. As the airflow continuously dilutes the low-oxygen gas in the upper corner, when the oxygen concentration sensor detects that the oxygen concentration in the upper corner area has reached the set upper threshold, it sends a signal to the PLC controller. The PLC controller then commands the explosion-proof motor to start. The explosion-proof motor rotates in the reverse direction, driving the lead screw to rotate. The internal threaded sleeve, which is threaded onto the lead screw, moves along the lead screw towards the connecting block as the lead screw rotates. The internal threaded sleeve drives the hanging crossbar and the windbreak to rotate around the third hinge as the fulcrum via the connecting rod. The angle between the hanging crossbar and the fixed rod increases, and the airflow channel between the vertical side of the windbreak near the second hinge and the side wall of the cut hole gradually decreases. The windbreak blocks the airflow inside the cut hole, and a smaller airflow passes through the vent 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 controls the opening and closing of the first and second explosion-proof motors, thereby adjusting the wind resistance area of ​​the windbreak electric adjustment component and adjusting the airflow entering the upper corner area, effectively solving the low oxygen problem in the upper corner and ensuring the safety of the upper corner.

[0013] The windbreak electric adjustment component uses an explosion-proof motor to drive the internal threaded sleeve to move axially on the lead screw. The internal threaded sleeve drives the connecting rod to rotate at the third hinge, thereby driving the suspension crossbar and the windbreak to adjust the wind resistance of the cut cross section. The counterweight ensures that the windbreak remains vertical, thereby improving the wind adjustment effect.

[0014] In summary, this utility model, through the cooperation of an oxygen concentration monitoring array, a PLC controller, and an electric windbreak adjustment component, can automatically adjust the wind resistance area according to on-site needs. By adjusting the electric windbreak adjustment component, the automation level of windbreak setup 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 safe production in the mine. Attached Figure Description

[0015] Figure 1 This is a plan view of the present invention;

[0016] Figure 2 yes Figure 1 Detailed structural diagram of the electric adjustment component for the stroke barrier;

[0017] Figure 3 yes Figure 2 A-direction view;

[0018] Figure 4 yes Figure 1 A diagram showing the arrangement of several oxygen concentration sensors in the upper corner. Detailed Implementation

[0019] like Figure 1-4 As shown, the electric adjustment device for upper corner oxygen concentration of this utility model includes a PLC controller 1, an oxygen concentration monitoring array 2, and an electric adjustment component for windbreaks 4. The oxygen concentration monitoring array 2 is located in the upper corner 5 area, and the electric adjustment component for windbreaks 4 is located in the cut-out 6 and adjacent to the upper corner 5. The upper end of the electric adjustment component for windbreaks 4 is connected to the upper end of the hydraulic support, and the lower end of the electric adjustment component for windbreaks 4 is connected to a counterweight 16. The signal output terminal of the oxygen concentration monitoring array 2 is connected to the signal receiving terminal of the PLC controller 1, and the signal output terminal of the PLC controller 1 is connected to the signal receiving terminal of the electric adjustment component for windbreaks 4.

[0020] The windbreak electric adjustment assembly 4 includes an explosion-proof motor 7, a lead screw 8, an internal threaded sleeve 9, a linkage mechanism, and a windbreak 10. The main shaft of the explosion-proof motor 7 is coaxially connected to one end of the lead screw 8 via a coupling 11. The lead screw 8 is horizontally positioned and its length direction is perpendicular to the length direction of the cut eye 6. The internal threaded sleeve 9 is threaded onto the lead screw 8. The other end of the lead screw 8 is provided with a connecting block 12. A fixing rod 13 parallel to the lead screw 8 is fixedly mounted on the side of the connecting block 12. A first fixing block 14 is provided on the top of the explosion-proof motor 7, and a second fixing block 15 is provided on the top of the fixing rod 13. The tops of the first fixing block 14 and the second fixing block 15 are both fixed to the top of the hydraulic support by stainless steel clamps. One end of the fixing rod 13 and the internal threaded sleeve 9 are connected to the upper side of the windbreak 10 via the linkage mechanism. At least three counterweights 16 are provided, and all counterweights 16 are evenly arranged along the lower side of the windbreak 10. The signal output terminal of the PLC controller 1 is connected to the signal receiving terminal of the explosion-proof motor 7.

[0021] The linkage mechanism includes a connecting rod 17 and a hanging crossbar 18. The center lines of the connecting rod 17, the hanging crossbar 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 threaded sleeve 9 through a first hinge 19, and the other end of the connecting rod 17 is connected to one end of the hanging crossbar 18 through a second hinge 20. The other end of the hanging crossbar 18 is connected to one end of the fixed rod 13 adjacent to the connecting block 12 through a third hinge 21. The upper side of the windbreak 10 is fixedly connected to the hanging crossbar 18.

[0022] The oxygen concentration monitoring array 2 includes several oxygen concentration sensors 22, which are arranged in a matrix at the upper corner 5. The oxygen concentration sensors 22 are located no more than 30cm from the top plate 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 makes a comprehensive judgment on the oxygen concentration distribution in the upper corner 5 area based on the data from the oxygen concentration sensors 22.

[0023] Upper corner 5 is located at the junction of return airway and opening cut eye 6. The air flow direction in the airway is: intake airway 36 → opening cut eye 6 → upper corner 5 → return airway 35. An oxygen concentration monitoring array 2 (including several arrayed oxygen concentration sensors 22) is set up inside the upper corner 5 area. Each oxygen concentration sensor 22 transmits the oxygen concentration data of the upper corner 5 area to the PLC controller 1. The PLC controller 1 determines that it is necessary to increase the fresh airflow in the upper corner 5 area to improve the oxygen concentration in the area. The PLC controller 1 sends a start signal to the explosion-proof motor 7. The explosion-proof motor 7 drives the lead screw 8 to rotate in the forward direction through the coupling 11. The internal threaded sleeve 9, which is threaded onto the lead screw 8, moves along the axial direction of the lead screw 8 as the lead screw 8 rotates. The internal threaded sleeve 9 drives the hanging crossbar 18 and the wind barrier 10 to move closer to the explosion-proof motor 7 through the connecting rod 17, thereby reducing the angle between the hanging crossbar 18 and the fixed rod 13. The airflow channel between the vertical side of the wind barrier 10 near the second hinge 20 and the side wall of the cut eye 6 gradually increases. The airflow flows to the upper corner 5 through this vertical airflow channel, replenishing the fresh air in the upper corner 5 area and eliminating the low oxygen problem in the area. The oxygen concentration in the upper corner 5 decreases. When the oxygen concentration sensor 22 detects that the oxygen concentration in the upper corner 5 area has reached the set lower threshold, it sends a signal to the PLC controller 1. The PLC controller 1 commands the explosion-proof motor 7 to shut down. As the airflow continuously dilutes the low oxygen level in the upper corner 5, when the oxygen concentration sensor 22 detects that the oxygen concentration in the upper corner 5 area has reached the set upper threshold, it sends a signal to the PLC controller 1. The PLC controller 1 commands the explosion-proof motor 7 to start, and the explosion-proof motor 7 rotates in reverse, driving the filament... As rod 8 rotates, the threaded sleeve 9, threaded onto the lead screw 8, moves along the lead screw 8 towards the connecting block 12. The threaded sleeve 9, via connecting rod 17, drives the hanging crossbar 18 and the windbreak 10 to rotate around the third hinge 21. The angle between the hanging crossbar 18 and the fixed rod 13 increases, and the airflow channel between the vertical side of the windbreak 10 near the second hinge 20 and the side wall of the cut-out eye 6 gradually decreases. The windbreak 10 blocks the airflow within the cut-out eye 6, and a smaller airflow passes through the vent and enters the upper corner 5 and the return airway 35. Following this process, the oxygen concentration sensor 22 monitors the oxygen concentration in the upper corner 5 in real time and transmits the signal to the PLC controller 1. The PLC controller 1 controls the opening and closing of the explosion-proof motor 7, thereby adjusting the windbreak electric adjustment component 4 to regulate the airflow by adjusting the wind resistance area through the cut-out eye 6, effectively solving the low oxygen problem in the upper corner and ensuring the safety of the upper corner 5.

[0024] The windbreak electric adjustment component 4 uses an explosion-proof motor 7 to drive the internal threaded sleeve 9 to move axially on the screw 8. The internal threaded sleeve 9 drives the connecting rod 17 to rotate at the third hinge 21, thereby driving the suspension crossbar 18 and the cross section of the windbreak's opening 6 to adjust the wind resistance. The counterweight 16 ensures that the windbreak remains vertical, thereby improving the wind adjustment effect.

[0025] It should be emphasized that the PLC controller 1, explosion-proof motor 7, oxygen concentration sensor 22, stainless steel clamps, windbreaks, and other components in this utility model are all existing technologies and are commercially available; their specific structures will not be described in detail. The automatic control between the PLC controller 1, oxygen concentration sensor 22, and explosion-proof motor 7 does not involve any new computer program.

[0026] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An electric regulating device for oxygen concentration at the upper corner, characterized in that: It includes a PLC controller, an oxygen concentration monitoring array, and an electric windbreak adjustment component. The oxygen concentration monitoring array is located in the upper corner, and the electric windbreak adjustment component is located inside the cut-out and adjacent to the upper corner. The upper end of the electric windbreak adjustment component is connected to the upper end of the hydraulic support, and the lower end of the electric windbreak adjustment component is connected to a counterweight. The signal output terminal of the oxygen concentration monitoring array is connected to the signal receiving terminal of the PLC controller, and the signal output terminal of the PLC controller is connected to the signal receiving terminal of the electric windbreak adjustment component.

2. The electric adjustment device for oxygen concentration at the upper corner according to claim 1, characterized in that: The windbreak electric adjustment assembly includes an explosion-proof motor, a lead screw, an internal threaded sleeve, a linkage mechanism, and a windbreak. The main shaft of the explosion-proof motor is coaxially connected to one end of the lead screw via a coupling. The lead screw is horizontally positioned with its length direction perpendicular to the length direction of the cut eye. The internal threaded sleeve is threaded onto the lead screw. A connecting block is provided at the other end of the lead screw. A fixing rod parallel to the lead screw is fixed to the side of the connecting block. A first fixing block is provided on the top of the explosion-proof motor, and a second fixing block is provided on the top of the fixing rod. The tops of the first and second fixing blocks are both fixed to the top of the hydraulic support by stainless steel clamps. One end of the fixing rod and the internal threaded sleeve are connected to the upper side of the windbreak through the linkage mechanism. At least three counterweights are provided, and all counterweights are evenly distributed along the lower side of the windbreak. The signal output terminal of the PLC controller is connected to the signal receiving terminal of the explosion-proof motor.

3. The electric regulating device for oxygen concentration at the upper corner according to claim 2, characterized in that: The linkage mechanism includes a connecting rod and a suspension crossbar. The center lines of the connecting rod, the suspension crossbar, 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 threaded sleeve through a first hinge, and the other end of the connecting rod is connected to one end of the suspension crossbar through a second hinge. The other end of the suspension crossbar is connected to one end of the fixed rod adjacent to the connecting block through a third hinge. The upper side of the windbreak is fixedly connected to the suspension crossbar.

4. The electric regulating device for oxygen concentration at the upper corner according to any one of claims 1-3, characterized in that: The oxygen concentration monitoring array includes several oxygen concentration sensors, which are arranged in a rectangular array in the upper corner area. The oxygen concentration sensors are located in the upper corner area at a position no more than 30cm from the top plate.

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