A fire prevention gas concentration detection device for coal mine goaf

Abstract

The invention discloses a gas concentration detection device for fire prevention in coal mine goaf areas, which relates to the field of environmental detection technology, comprising a cylinder, a side wall of which is provided with an air inlet for introducing air to be detected; an air outlet cylinder, connected to the upper end of the cylinder, and having fan blades rotatably arranged inside the cylinder, the rotation of the fan blades driving the air to enter from the air inlet and flow through the entire device; a funnel-shaped dust collecting cylinder, connected to the lower end of the cylinder, and having a plurality of baffles distributed circumferentially inside the cylinder for preliminarily filtering and blocking dust impurities in the air, so that the purified air enters the cylinder for detection; a dust collecting box, connected to the bottom of the dust collecting cylinder; a plurality of sensor cylinders, evenly distributed circumferentially in the cylinder, each sensor cylinder being provided with a connecting seat, and each connecting seat being installed with a gas semiconductor sensor; the invention can improve the accuracy of gas concentration detection, flexibly adapt to different working conditions, and intelligently clean and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of environmental detection, in particular to a fire prevention gas concentration detection device for coal mine goaf areas. Background Art

[0002] The detection of fire prevention gas concentration in coal mine goaf is an important part of coal mine safety production. Spontaneous combustion in coal mine goaf is one of the main types of coal mine fires, accounting for about 60% of coal spontaneous combustion fires in coal mines, which seriously threatens the safe production of coal mines. Therefore, accurate and timely detection of gas concentrations in coal mine goafs, especially the concentration of key fire prevention gases, is of great significance for preventing and controlling the occurrence of fires. The environment of coal mine goafs is complex, with a large number of flammable, explosive and toxic gases, such as methane (CH4), carbon monoxide (CO), hydrogen sulfide (H2S), etc. These gases are very likely to cause fires or explosions under certain conditions, which will not only cause huge economic losses, but also seriously threaten the lives of miners. Therefore, real-time monitoring and early warning of gas concentrations in coal mine goafs are important measures to ensure safe production in coal mines.

[0003] There are many difficulties in detecting the concentration of fire-prevention gas in coal mine goaf, mainly including the following aspects:

[0004] Poor air flow: The air flow in the goaf is poor and the gas distribution is uneven. This results in that in some areas, even if the gas concentration is already high, it may not be detected in time due to poor air flow, thus delaying the timing of fire warning.

[0005] High dust content: The dust content in the coal mine goaf is extremely high. After a long period of accumulation, it will cover the sensor surface and affect the sensitivity and accuracy of the sensor. In addition, dust may also block the air inlet of the detection equipment, resulting in distortion of the detection data.

[0006] High real-time detection requirements: The detection of fire-prevention gas concentration in coal mine goaf areas needs to be highly real-time so that early warnings can be issued before a fire occurs.

[0007] Gas concentration detection mostly adopts the "bundle tube + chromatograph" monitoring method. Although this method can realize the detection of gas concentration to a certain extent, the chromatograph, as a key equipment, is highly complex and large in size. It is extremely inconvenient to install and use it underground in coal mines, and its safety is poor. The ground installation method leads to long exhaust pipelines, which are prone to blockages, leaks, and pipe breaks, affecting the credibility of monitoring data and the maintenance of the system. Due to the harsh environment and poor air flow in the goaf, traditional detection devices have obvious deficiencies in detection accuracy and real-time performance, and it is difficult to meet the actual needs of coal mine safety production. Semiconductor gas sensors are easily interfered by dust and have requirements for the flow rate of the gas. It is necessary to ensure that the gas is continuously blown to the sensor surface.

[0008] Therefore, it is necessary to provide a fire prevention gas concentration detection device for coal mine goaf to solve the problems raised in the above background technology. Summary of the invention

[0009] To achieve the above object, the present invention provides the following technical solution: a device for detecting fire prevention gas concentration in coal mine goaf, comprising:

[0010] The cylinder has a side wall with an air inlet for introducing the air to be tested;

[0011] An air outlet is connected to the upper end of the cylinder, and a fan blade is rotatably arranged inside the air outlet. The rotation of the fan blade drives air to enter from the air inlet and flow through the entire device;

[0012] A funnel-shaped dust collecting cylinder is connected to the lower end of the cylinder, and a plurality of baffles are distributed on the inner circumference thereof, which are used for preliminary filtering and blocking dust impurities in the air, so that the purified air enters the cylinder for detection;

[0013] The baffle in the dust collecting barrel is arranged at an angle to increase the complexity of the air flow path, thereby improving the filtering efficiency of dust impurities;

[0014] A dust collecting box connected to the bottom of the dust collecting cylinder is used to collect and store dust impurities intercepted by the baffle, so as to facilitate cleaning and replacement;

[0015] A plurality of sensor cylinders are evenly distributed around the cylinder, each of which is provided with a connection seat, and each of which is equipped with a gas semiconductor sensor for detecting the concentration of different gases in the air flowing through;

[0016] A gap is maintained between the connecting seat and the inner wall of the sensor tube to allow air to circulate in the sensor tube and ensure that the gas semiconductor sensors in each sensor tube can fully contact the air;

[0017] The motor is arranged in the cylinder and is used for driving the fan blades to rotate, thereby driving the air flow.

[0018] Preferably, a funnel-shaped air intake hopper is provided below the sensor tube in the cylinder body, the lower end of the air intake hopper is connected to an air intake pipe, the lower end of the air intake pipe is located below the baffle and extends into the dust collecting cylinder.

[0019] Preferably, the lower end of the air inlet pipe is slidably connected to an extension pipe.

[0020] Preferably, each baffle is rotatably connected between the cylinder and the side wall of the air inlet pipe in a circumferentially uniformly distributed manner, the rotating shaft of each baffle penetrates the outer wall of the cylinder, and a plurality of levers are fixed to one end of the outer wall of the cylinder.

[0021] Preferably, the outer wall of the cylinder is slidably connected with a lower sliding ring, and each of the shifting rods is hinged to the lower sliding ring.

[0022] Preferably, the sensor tube is a waist-shaped tube with large diameters at both ends and a small diameter in the middle;

[0023] The upper and lower ends of each sensor tube are respectively fitted into the upper sealing plate and the lower sealing plate, and the upper sealing plate and the lower sealing plate are both provided with a hole that penetrates the sensor tube.

[0024] Preferably, a connecting rod is fixed above each of the connecting seats, each of the connecting rods is fixed to a connecting ring, and the connecting ring is slidably arranged in the cylinder;

[0025] An upper sliding ring is slidably arranged on the outer wall of the cylinder, and the upper sliding ring passes through the gap of the side wall of the cylinder and is fixedly connected with the connecting ring.

[0026] Preferably, scraping strips are distributed circumferentially on the lower end surface of the lower sealing plate.

[0027] Preferably, the scraper strip is connected to a ratchet wheel, and the ratchet wheel is rotatably connected to the lower end surface of the lower sealing plate;

[0028] A ratchet rotating disc is rotatably arranged inside the ratchet wheel, and a plurality of ratchets are distributed on the outer wall of the ratchet rotating disc;

[0029] The motor is a dual-output shaft motor, and the ratchet turntable is connected to the lower end of the motor.

[0030] Preferably, a bidirectional telescopic cylinder is distributed on the outer wall of the cylinder, and the bidirectional telescopic cylinder can telescope in both directions synchronously.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The dust collecting tube and baffle in the present invention utilize the principle of aerodynamics, and effectively intercept and remove dust impurities in the air by increasing the complexity and turbulence of the air flow path. The gas purification effect is improved, the false alarm and failure rate of the sensor caused by dust pollution are reduced, the service life of the equipment is extended, and the maintenance cost is reduced. In addition, the dust collecting box can conveniently clean the dust, further improving the ease of use and maintainability of the equipment.

[0033] The present invention can flexibly adapt to different working conditions by adjusting the inclination angle of the baffle and the position of the air inlet pipe. It not only improves the dust removal effect, but also ensures the stability of air flow, so that the sensor can stably detect the change of gas concentration in the goaf. At the same time, the motor drives the rotation of the fan blades to achieve continuous air flow, improve detection efficiency, and make data update more timely and accurate.

[0034] The present invention can automatically clean dust on the sensor surface through the reverse rotation of the motor and the rotation of the scraper, thereby ensuring the cleanliness of the sensor and the accuracy of detection, which not only reduces the workload of manual cleaning and reduces labor costs, but also improves the automation and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a fire prevention gas concentration detection device for coal mine goaf area;

[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of a device for detecting the concentration of fire-proof gas in coal mine goaf;

[0037] Figure 3 It is a schematic diagram of the planing structure of a device for detecting the concentration of fire-proof gas in coal mine goaf;

[0038] Figure 4 It is a schematic diagram of the structure of the baffle in the present invention;

[0039] Figure 5 It is a schematic diagram of the structure of the scraper strip in the present invention;

[0040] In the figure: 1. cylinder; 2. air inlet; 3. air outlet; 31. fan blades; 4. dust collection cylinder; 41. dust collection box; 5. sensor cylinder; 51. connecting seat; 52. connecting rod; 53. connecting ring; 6. baffle; 61. lever; 62. lower sliding ring; 71. air intake hopper; 72. air intake pipe; 73. extension pipe; 8. scraper; 81. ratchet; 82. ratchet turntable; 9. motor; 10. two-way telescopic cylinder; 11. upper sliding ring; 12. upper sealing plate; 13. lower sealing plate. DETAILED DESCRIPTION

[0041] See also Figure 1-Figure 5 In an embodiment of the present invention, a device for detecting fire prevention gas concentration in a coal mine goaf includes:

[0042] The cylinder 1 has an air inlet 2 on its side wall for introducing the air to be tested;

[0043] The air outlet 3 is connected to the upper end of the cylinder 1, and a fan blade 31 is rotatably arranged inside the air outlet 3. The rotation of the fan blade 31 drives the air to enter from the air inlet 2 and flow through the entire device;

[0044] A funnel-shaped dust collecting cylinder 4 is connected to the lower end of the cylinder 1, and a plurality of baffles 6 are distributed on the inner circumference thereof, which are used for preliminary filtering and blocking dust impurities in the air, so that the purified air enters the cylinder 1 for detection;

[0045] The baffle 6 in the dust collecting tube 4 is tilted to increase the complexity of the air flow path, thereby improving the filtering efficiency of dust impurities;

[0046] A dust box 41 is connected to the bottom of the dust collecting cylinder 4 and is used to collect and store dust impurities intercepted by the baffle 6 for easy cleaning and replacement;

[0047] A plurality of sensor cylinders 5 are evenly distributed around the inner circumference of the cylinder body 1, each of the sensor cylinders 5 is provided with a connection seat 51, and each of the connection seats 51 is equipped with a gas semiconductor sensor for detecting the concentration of different gases in the air flowing therethrough;

[0048] Gas semiconductor sensors can detect the concentration of multiple gases in the air flowing through, such as methane, carbon monoxide, oxygen, etc. The sensors convert the detected gas concentration signals into electrical signals for analysis and processing by the data processing system;

[0049] A gap is maintained between the connecting seat 51 and the inner wall of the sensor tube 5 to allow air to flow in the sensor tube 5 and ensure that the gas semiconductor sensors in each sensor tube 5 can fully contact the air;

[0050] The motor 9 is disposed in the cylinder 1 and is used to drive the fan blades 31 to rotate, thereby driving the air flow.

[0051] The fan blades 31 are driven to rotate so that air flows from the air inlet 2 through the dust collecting tube 4 for dust removal into the cylinder body 1, and then flows into each sensor tube 5 respectively, and the gas semiconductor sensors connected to the connecting seat 51 in the sensor tube 5 are used to detect the concentration of multiple groups of gases. During the whole process, the air continues to flow inside the device, ensuring that the sensor can stably detect the changes in gas concentration in the goaf.

[0052] In this embodiment, a funnel-shaped air intake hopper 71 is provided below the sensor tube 5 in the cylinder body 1 , and the lower end of the air intake hopper 71 is connected to an air intake pipe 72 . The lower end of the air intake pipe 72 is located below the baffle 6 and extends into the dust collecting cylinder 4 .

[0053] That is to say, the air entering the cylinder body 1 from the air inlet 2 needs to first pass through the gap of the baffle 6 and go around the lower end of the air inlet pipe 72 before it can flow into each sensor cylinder 5 from the air inlet hopper 71, so that the baffle 6 can be fully utilized to block dust, and after the air flows through the baffle 6, a downward-flowing spiral airflow is formed in the dust collecting cylinder 4, so that the dust particles in the air are more easily intercepted during collision and friction, and the dust falls onto the side wall of the dust collecting cylinder 4 and the dust collecting box 41 under the action of gravity.

[0054] In this embodiment, the lower end of the air inlet pipe 72 is slidably connected with an extension pipe 73. By adjusting the height of the extension pipe 73, the air inlet position of the air inlet pipe 72 can be adjusted, so that the air is turned back to different depths in the dust collecting barrel 4 to adjust the most suitable dust removal effect.

[0055] See also Figure 4 In this embodiment, each baffle 6 is rotatably connected between the cylinder body 1 and the side wall of the air inlet pipe 72 in a circumferentially uniformly distributed manner, the rotating shaft of each baffle 6 penetrates the outer wall of the cylinder body 1, and a plurality of levers 61 are fixed to one end of the outer wall of the cylinder body 1.

[0056] By rotating the lever 61, the baffle 6 can be tilted at different angles to suit different working conditions; the inclination angle of the baffle 6 determines the turning angle of the air when passing through the baffle. The larger the inclination angle, the larger the turning angle required for the air to pass through the baffle, which increases the complexity and turbulence of the air flow. Turbulence helps to separate dust particles in the air from the airflow and improve the dust removal efficiency, but it will reduce the air circulation volume.

[0057] In this embodiment, the outer wall of the cylinder 1 is slidably connected with a lower lower ring 62 , and each of the shifting rods 61 is hinged to the lower lower ring 62 .

[0058] That is to say, the inclination angle of each baffle 6 can be synchronously adjusted by sliding the lower lower ring 62 .

[0059] In this embodiment, the sensor tube 5 is a waist-shaped tube with large diameters at both ends and a small diameter in the middle.

[0060] The upper and lower ends of each sensor tube 5 are respectively attached to the upper sealing plate 12 and the lower sealing plate 13 . The upper sealing plate 12 and the lower sealing plate 13 are both provided with a hole that penetrates the sensor tube 5 .

[0061] That is to say, under the sealing of the upper sealing plate 12 and the lower sealing plate 13, air can only pass through the inside of the sensor tube 5, and cannot pass through the gaps of the sensor tube 5, which ensures that the air flow through each sensor tube 5 is stable and sufficient, providing a sufficient sample volume for the gas semiconductor sensor to detect;

[0062] And because the sensor tube 5 is a waist-shaped tube with large diameters at both ends and a small diameter in the middle, the flow rate of air increases when it flows to the middle of the sensor tube 5, ensuring that the air can better cover the surface of the gas semiconductor sensor, thereby improving the sensitivity and accuracy of detection.

[0063] In this embodiment, a connecting rod 52 is fixed above each connecting seat 51, and each connecting rod 52 is fixed to a connecting ring 53, and the connecting ring 53 is slidably disposed in the cylinder 1;

[0064] An upper sliding ring 11 is slidably disposed on the outer wall of the cylinder 1 , and the upper sliding ring 11 passes through the gap in the side wall of the cylinder 1 and is fixedly connected to the connecting ring 53 .

[0065] That is to say, the height of each connecting seat 51 can be controlled by sliding the upper slip ring 11, thereby controlling the position of the sensor.

[0066] See also Figure 5 In this embodiment, scraper strips 8 are distributed around the circumference of the lower end surface of the lower sealing plate 13 .

[0067] In this embodiment, the scraper strip 8 is connected to a ratchet wheel 81, and the ratchet wheel 81 is rotatably connected to the lower end surface of the lower sealing plate 13;

[0068] A ratchet rotating disc 82 is rotatably disposed inside the ratchet wheel 81, and a plurality of ratchets are distributed on the outer wall of the ratchet rotating disc 82;

[0069] The motor 9 is a dual-output shaft motor, and the ratchet turntable 82 is connected to the lower end of the motor 9 .

[0070] That is to say, the motor 9 can drive the ratchet turntable 82 to rotate, and the ratchet turntable 82 and the ratchet wheel 81 have one-way transmission. When the motor 9 drives the fan blades 31 to discharge air upward, the ratchet turntable 82 cannot drive the ratchet wheel 81 to rotate, and when the motor 9 drives the fan blades 31 to discharge air downward, the ratchet turntable 82 will drive the ratchet wheel 81 to rotate. At this time, the connecting seat 51 descends so that the bottom of the connecting seat 51 is flush with the lower sealing plate 13. When the scraper 8 rotates, the dust on the surface of the sensor can be removed, thereby ensuring the cleanliness of the sensor. In addition, since the fan blades 31 discharge air downward at this time, the air flows in the opposite direction and blows the dust downward, further improving the cleaning effect.

[0071] In this embodiment, a bidirectional telescopic cylinder 10 is distributed on the outer wall of the cylinder 1, and the bidirectional telescopic cylinder 10 is bidirectionally and synchronously telescopic. The bidirectional telescopic cylinder 10 is respectively connected to the lower sliding ring 62 and the upper sliding ring 11, that is, when the upper sliding ring 11 slides downward, the lower sliding ring 62 slides upward at the same time, and is in the cleaning mode at this time, so that the inclination angle of the baffle 6 is minimized and is in a vertical state to avoid blocking the reverse flow of air when cleaning the sensor.

[0072] The specific implementation includes:

[0073] Turn on the motor 9, the motor drives the fan blades 31 to rotate, generating air flow. At this time, the air enters from the air inlet 2, undergoes preliminary dust removal in the dust collecting tube 4, and then enters the cylinder body 1 through the air inlet pipe 72 and the air inlet hopper 71;

[0074] The air forms a spiral airflow in the dust collecting cylinder 4, and the dust particles are intercepted during the collision and friction and fall into the dust collecting box 41;

[0075] According to the working conditions to be detected, the tilt angle of the baffle 6 is adjusted by sliding the lower lower ring 62 and using the lever 61. The larger the tilt angle, the better the dust removal effect, but the air flow rate will be reduced.

[0076] The purified air continues to flow upward and enters the sensor tubes 5 in the cylinder body 1. The gas semiconductor sensors in the sensor tubes 5 start to work, detecting the concentrations of various gases such as methane, carbon monoxide, and oxygen in the air, and converting the detected concentration signals into electrical signals for analysis and processing by the data processing system.

[0077] The motor 9 is regularly set to rotate in the reverse direction so that the fan blades 31 blow air downwards. By sliding the upper sliding ring 11, the height of the connecting seat 51 in the sensor tube 5 is adjusted using the connecting rod 52 and the connecting ring 53 so that the bottom of the connecting seat 51 is flush with the lower sealing plate 13. At this time, the ratchet turntable 82 drives the scraper 8 to rotate through the ratchet wheel 81 to scrape off the dust on the surface of the sensor. At the same time, the reverse air flow blows the dust downwards, further improving the cleaning effect.

[0078] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fire prevention gas concentration detection device for coal mine goaf, characterized in that: include: The cylinder (1) has a side wall provided with an air inlet (2) for introducing air to be tested; An air outlet (3) is connected to the upper end of the cylinder (1), and has a fan blade (31) rotatably arranged inside the air outlet. The rotation of the fan blade (31) drives air to enter from the air inlet (2) and flow through the entire device; A funnel-shaped dust collecting cylinder (4) is connected to the lower end of the cylinder (1), and has a plurality of baffles (6) distributed around its inner circumference for preliminarily filtering and blocking dust impurities in the air, so that the purified air enters the cylinder (1) for detection; The baffle (6) in the dust collecting barrel (4) is arranged to be inclined so as to increase the complexity of the air flow path, thereby improving the filtering efficiency of dust impurities; A dust collecting box (41) connected to the bottom of the dust collecting cylinder (4) and used to collect and store dust impurities intercepted by the baffle (6) for easy cleaning and replacement; A plurality of sensor cylinders (5) are evenly distributed on the inner circumference of the cylinder body (1), each of the sensor cylinders (5) is provided with a connection seat (51), and each of the connection seats (51) is equipped with a gas semiconductor sensor for detecting the concentration of different gases in the air flowing therethrough; A gap is maintained between the connecting seat (51) and the inner wall of the sensor cylinder (5) to allow air to flow in the sensor cylinder (5) and ensure that the gas semiconductor sensor in each sensor cylinder (5) can fully contact the air; The motor (9) is disposed in the cylinder (1) and is used to drive the fan blades (31) to rotate, thereby driving air flow.

2. A device for detecting fire prevention gas concentration in coal mine goaf according to claim 1, characterized in that: A funnel-shaped air intake hopper (71) is provided below the sensor cylinder (5) in the cylinder body (1); the lower end of the air intake hopper (71) is connected to an air intake pipe (72); the lower end of the air intake pipe (72) is located below the baffle (6) and extends into the dust collecting cylinder (4).

3. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 2, characterized in that: The lower end of the air inlet pipe (72) is slidably connected to an extension pipe (73).

4. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 2, characterized in that: Each baffle (6) is evenly distributed circumferentially and rotatably connected between the cylinder (1) and the side wall of the air inlet pipe (72); the rotating shaft of each baffle (6) penetrates the outer wall of the cylinder (1), and a plurality of levers (61) are fixed to one end of the outer wall of the cylinder (1).

5. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 4, characterized in that: The outer wall of the cylinder (1) is slidably connected to a lower lower ring (62), and each of the shifting rods (61) is hinged to the lower lower ring (62).

6. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 1, characterized in that: The sensor tube (5) is a waist-shaped tube with large diameters at both ends and a small diameter in the middle; The upper and lower ends of each sensor tube (5) are respectively fitted into an upper sealing plate (12) and a lower sealing plate (13), and both the upper sealing plate (12) and the lower sealing plate (13) are provided with a hole that penetrates the sensor tube (5).

7. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 6, characterized in that: A connecting rod (52) is fixed above each connecting seat (51), each connecting rod (52) is fixed to a connecting ring (53), and the connecting ring (53) is slidably disposed in the cylinder (1); An upper sliding ring (11) is slidably provided on the outer wall of the cylinder (1); the upper sliding ring (11) passes through a gap in the side wall of the cylinder (1) and is fixedly connected to the connecting ring (53).

8. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 6, characterized in that: Scraping strips (8) are distributed around the circumference of the lower end surface of the lower sealing plate (13).

9. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 8, characterized in that: The scraper strip (8) is connected to a ratchet (81), and the ratchet (81) is rotatably connected to the lower end surface of the lower sealing plate (13); A ratchet rotating disc (82) is rotatably disposed inside the ratchet wheel (81), and a plurality of ratchets are distributed on the outer wall of the ratchet rotating disc (82); The motor (9) is a dual-output shaft motor, and the ratchet turntable (82) is connected to the lower end of the motor (9).

10. The device for detecting fire prevention gas concentration in coal mine goaf according to claim 1, characterized in that: A bidirectional telescopic cylinder (10) is distributed on the outer wall of the cylinder (1), and the bidirectional telescopic cylinder (10) is bidirectionally and synchronously telescopic.

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