Mine gas monitoring and early warning device

Abstract

This utility model relates to the field of gas monitoring and early warning technology, and discloses a mine gas monitoring and early warning device. It includes two symmetrically spaced fixed plates, with a hollow gas main pipe inserted between the two plates. The front end of the gas main pipe is connected sequentially to a first conical connecting pipe and a second conical connecting pipe, the second conical connecting pipe being connected to an inlet pipe. The rear end of the gas main pipe is connected to the conical pipe. This utility model utilizes a fan blade, worm gear, worm, rotating disk, and striking block. The flow of gas drives the fan blade to rotate, and the worm gear and rotating disk drive the striking block to strike a transverse striking plate, producing a striking sound. Monitoring personnel can determine changes in gas flow rate and thus anomalies in gas concentration based on the frequency and interval of the striking sound. This mechanical early warning structure requires no electricity, has strong anti-interference capabilities, and reduces costs.

Description

Technical Field

[0001] This utility model relates to mine gas monitoring and early warning, specifically a mine gas monitoring and early warning device, belonging to the field of gas monitoring technology. Background Technology

[0002] In the coal mining sector, with the continuous increase in mining depth and intensity, gas emissions are showing a significant upward trend. The damage to coal and rock masses caused by mining operations creates conditions for gas release. Furthermore, the complex underground working environment presents numerous ignition sources, including sparks from blasting, electrical equipment malfunctions, and frictional impacts. Simultaneously, if the ventilation system is poorly designed, gas can easily accumulate. When the gas concentration is in the dangerous range of 5%-16%, it can trigger a highly destructive explosion upon encountering an ignition source. Gas explosions not only cause serious casualties but also cause devastating damage to equipment and roadways, and may even induce secondary disasters such as coal dust explosions, posing a serious threat to coal mine safety and sustainable development. Therefore, constructing a scientific, efficient, and accurate mine gas monitoring and early warning system is urgently needed; it is crucial for ensuring safe coal mine production, protecting miners' lives, and promoting the healthy development of the coal industry.

[0003] However, existing mine gas monitoring equipment generally uses gas sensors to monitor gas, which has the following drawbacks: (1) Gas sensors are easily affected by environmental factors such as dust, humidity and temperature in the mine, resulting in false alarms or missed alarms; (2) The harsh underground environment may accelerate the aging of gas sensors and shorten the service life of the equipment; (3) Workers may accidentally touch or damage the equipment, which may cause monitoring interruption; (4) Traditional monitoring equipment is large in size, requires professional personnel to operate, and is inconvenient to deploy in narrow roadways or high-altitude locations. Utility Model Content

[0004] The purpose of this invention is to provide a mine gas monitoring and early warning device to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A mine gas monitoring and early warning device includes two fixed plates symmetrically spaced apart, a hollow gas pipe inserted between the two fixed plates, the front end of the gas pipe being connected to a first conical connecting pipe and a second conical connecting pipe in sequence, the second conical connecting pipe being connected to an air inlet pipe, and the tail end of the gas pipe being connected to the conical pipe.

[0007] Multiple rotating shafts are installed inside the gas main pipe. Each rotating shaft has multiple fan blades fixed on its outer circumference along the circumferential direction. Each rotating shaft is fixedly connected to a worm gear. A worm wheel is connected above the worm gear through a threaded drive. The main rotating shaft is inserted into the center of all the worm wheels.

[0008] A hollow side power tube is fixed axially on one side of the outer circumference of the gas main pipe, and the worm, worm wheel and main rotating shaft are all placed in the side power tube.

[0009] A secondary rotating shaft is fixedly installed at the tail end of the main rotating shaft. A rotating disk is fixedly sleeved on the outer circumferential surface of the middle part of the secondary rotating shaft. Multiple swing shafts are fixed along the circumferential direction on the outside of the rotating disk. A striking block is fixed at the end of each swing shaft away from the rotating disk. A vertical plate is provided on the side of the rotating disk near the gas main pipe. One end of the insertion rod is rotatably connected to the upper part of the vertical plate. The other end of the insertion rod is inserted and fixed to the fixed plate. Horizontal striking plates are provided at the upper and lower ends of the vertical plate. When the rotating disk drives the striking block to rotate, the striking block slides in contact with the horizontal striking plate.

[0010] Furthermore, each of the fixed plates has a connecting plate at both the upper and lower ends of its middle section, and each connecting plate has a fixing hole.

[0011] Furthermore, the worm gear is connected to the rotating shaft through the gas main pipe.

[0012] Furthermore, the width of the striking block is smaller than the width of the horizontal striking plate, and the upper surface of the horizontal striking plate is a ceramic plate.

[0013] Furthermore, a counterweight is rotatably provided at the bottom end of the vertical plate, and a groove is provided on the side of the gas main pipe adjacent to the vertical plate. The counterweight is slidably placed in the groove, and the thickness of the counterweight is less than the thickness of the gas main pipe groove.

[0014] Furthermore, two support plates are spaced apart on the main rotating shaft, the two support plates are rotatably connected to the main rotating shaft, and the tops of the two support plates are fixed to the top surface inside the side power pipe.

[0015] Furthermore, the fan blade is a semi-elliptical plate, with symmetrical arc-shaped grooves on the top of the front and rear faces of the semi-elliptical plate, and an inwardly concave arc surface provided in the lower part of each arc-shaped groove.

[0016] Furthermore, the thinner ends of the first tapered connecting tube and the second tapered connecting tube are joined together, and the whole tube forms an hourglass shape after joining.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model involves installing fan blades inside the gas main pipe and installing a worm gear, worm, and main rotating shaft inside the power pipe on one side of the gas main pipe. The main rotating shaft cooperates with the auxiliary rotating shaft and the rotating disk. When there is gas passing through the gas main pipe and the gas flow rate is greater than 3m³ / h, the system can achieve this. 3At a flow rate of [value missing] / min, the gas flow drives the fan blades to rotate. Under the action of the worm gear and worm wheel, the rotating disk drives the striking block to strike the transverse striking plate, producing a knocking sound. Monitoring personnel can then determine changes in gas flow rate and, consequently, abnormal gas concentrations based on the frequency and interval of the knocking sound. This mechanical early warning structure requires no electricity, has strong anti-interference capabilities, and reduces costs.

[0019] 2. This utility model, by placing the worm gear and worm inside the side power pipe, prevents dust mixed in with the gas from entering the interior, avoids corrosion of parts during prolonged use, increases the service life of the equipment, and can proactively prevent gas accidents. It is applicable when the gas flow rate is greater than 3m³ / h. 3 When the alarm is triggered at a certain time (e.g., / min), it will sound an alarm, buying precious time for on-site personnel to evacuate and for emergency response. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the gas main pipe of this utility model;

[0022] Figure 3 This is a schematic diagram of the worm gear connection structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the right side structure of this utility model;

[0024] Figure 5 This is a front structural diagram of the present invention.

[0025] In the diagram: 1. Fixed plate; 2. Gas main pipe; 3. Vertical plate; 4. Horizontal striking plate; 5. Side power pipe; 6. Inlet pipe; 7. Fan blade; 71. Arc-shaped groove; 72. Arc surface; 8. Rotating disc; 9. Swing shaft; 10. Striking block; 11. Worm gear; 12. Worm wheel; 13. Support plate; 14. Main rotating shaft; 15. Secondary rotating shaft; 16. Counterweight; 171. First conical connecting pipe; 172. Second conical connecting pipe; 18. Conical pipe; 19. Connecting plate; 191. Fixing hole; 20. Insert rod; 21. Rotating shaft. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5 As shown, a mine gas monitoring and early warning device includes two fixed plates 1 arranged symmetrically at intervals. A hollow gas pipe 2 is inserted between the two fixed plates 1. The front end of the gas pipe 2 is connected to a first conical connecting pipe 171 and a second conical connecting pipe 172 in sequence. The second conical connecting pipe 172 is connected to an air inlet pipe 6. The tail end of the gas pipe 2 is connected to a conical pipe 18.

[0028] Multiple rotating shafts 21 are rotatably installed inside the gas main pipe 2. Each rotating shaft 21 has multiple fan blades 7 fixed along the circumferential direction on its outer circumferential surface. Each rotating shaft 21 is fixedly connected to a worm gear 11. A worm wheel 12 is connected to the top of the worm gear 11 through a threaded drive. A main rotating shaft 14 is inserted into the center of all the worm wheels 12. A hollow side power pipe 5 is fixed along the axial direction on one side of the outer circumferential surface of the gas main pipe 2. The worm gear 11, worm wheel 12 and main rotating shaft 14 are all placed in the side power pipe 5. The side power pipe 5 restricts the position of the worm gear 11 and protects the worm wheel 12, worm gear 11 and other parts to prevent dust and other impurities from entering.

[0029] A secondary rotating shaft 15 is fixedly installed at the tail end of the main rotating shaft 14. A rotating disk 8 is fixedly sleeved on the outer circumferential surface of the middle part of the secondary rotating shaft 15. Multiple swing shafts 9 are fixed on the outside of the rotating disk 8 along the circumferential direction. A striking block 10 is fixed at the end of each swing shaft 9 away from the rotating disk 8. A vertical plate 3 is provided on the side of the rotating disk 8 near the gas main pipe 2. The upper part of the vertical plate 3 is inserted into the fixed plate 1 through the insertion rod 20. Two horizontal striking plates 4 are provided at the upper and lower ends of the vertical plate 3. Both horizontal striking plates 4 are provided on the side of the vertical plate 3 adjacent to the rotating disk 8. The width of the striking block 10 is smaller than the width of the horizontal striking plate 4. When the rotating disk 8 drives the striking block 10 to rotate, the striking block 10 slides in contact with the horizontal striking plate 4.

[0030] Each of the fixed plates 1 has a connecting plate 19 at both the upper and lower ends of its middle section, and each connecting plate 19 has a fixing hole 191. By providing the connecting plate 19 and the fixing hole 191, it is convenient to connect the fixed plate 1 to an external fixing device.

[0031] The worm gear 11 passes through the gas main pipe 2 and is connected to the rotating shaft 21.

[0032] The width of the striking block 10 is smaller than the width of the horizontal striking plate 4, and the upper surface of the horizontal striking plate 4 is a ceramic plate.

[0033] A counterweight 16 is rotatably mounted at the bottom of the vertical plate 3. A groove is provided on the side of the gas main pipe 2 near the tail end of the vertical plate 3. The counterweight 16 is slidably placed in the groove, and the thickness of the counterweight 16 is less than the thickness of the groove of the gas main pipe 2. The counterweight 16 enables the vertical plate 3 to swing back and forth, preventing jamming when it comes into contact with the striking block 10.

[0034] Two support plates 13 are spaced apart on the main rotating shaft 14. The two support plates 13 are rotatably connected to the main rotating shaft 14, and the tops of the two support plates 13 are fixed to the top surface inside the side power pipe 5. The support plates 13 support the main rotating shaft 14 to ensure smooth rotation.

[0035] The fan blade 7 is a semi-elliptical plate, with symmetrical arc-shaped grooves 71 on the top of the front and rear ends of the semi-elliptical plate. Each arc-shaped groove 71 has an inwardly recessed arc surface 72 at its lower part, so that the fan blade 7 can rotate better under the action of gas.

[0036] The thinner ends of the first tapered connecting pipe 171 and the second tapered connecting pipe 172 are joined together, forming an hourglass shape. Gas enters the second tapered connecting pipe 172 through the inlet pipe 6. As the gas passes through the smaller diameter pipe at the junction of the second tapered connecting pipe 172 and the first tapered connecting pipe 171, the subsequent flow rate of the gas is faster, better driving the fan blades 7 inside the gas main pipe 2 to rotate. A tapered pipe 18 is provided at the right end of the gas main pipe 2. The diameter of the tapered pipe 18 at the right end of the gas main pipe 2 is small to prevent impurities from entering the interior.

[0037] In this embodiment, the diameter D of the gas main pipe 2 is 0.1m, the long half-axis a of the fan blade 7 is 0.04m, and the short half-axis b of the fan blade 7 is 0.03m.

[0038] The fan blade 7 needs to overcome the frictional resistance torque f of the shaft to start. 阻 When the driving torque T generated by the gas 驱 Greater than the bearing frictional resistance torque f 阻 At that moment, fan blade 7 begins to rotate. Driving torque T 驱 Determined based on the following expression:

[0039]

[0040] A = π × a × b (4)

[0041] Among them, T 驱 The driving torque is N·m; ρ is the density of the gas, kg / m³. 3 v is the gas flow velocity, m / s; C d The drag coefficient is set to 1 for general calculations; A is the windward area of ​​blade 7, in meters. 2Q represents the gas flow rate, in meters (m). 3 / min; S is the cross-sectional area of ​​the gas pipe 2, m 2 D is the diameter of the gas pipe 2, m; a refers to the long semi-axis of the fan blade 7, m; b refers to the short semi-axis of the fan blade 7, m.

[0042] The critical value for gas flow rate is set at 3m³ / h. 3 / min, that is, Q = 3m 3 / min; combined methane gas density ρ=0.71kg / m³ 3 D = 0.1m, a = 0.04m, b = 0.03m; by substituting formulas (2), (3), and (4) into formula (1), the critical driving torque T that drives the fan blade 7 to rotate when the gas passes through the gas main pipe 2 is determined. 临驱 It is 0.00163 N·m.

[0043] That is, the rotating shaft frictional resistance torque f of the mine gas monitoring and early warning device of this utility model is set. 阻 =T 临驱 When a flow rate of gas exceeding a critical value passes through, the driving torque T generated by the gas is... 驱 Greater than the set bearing frictional resistance torque f 阻 The gas drives the fan blades 7 to rotate, causing the striking block 10 to contact the transverse striking plate 4 and produce a striking sound; conversely, when a flow rate of gas less than or equal to the critical value passes through, the driving torque T generated by the gas... 驱 It cannot drive the fan blade 7 to rotate, thus preventing the generation of knocking sounds; thereby achieving the purpose of monitoring and early warning of excessive methane gas.

[0044] The inlet pipe 6 of this utility model's mine gas monitoring and early warning device is placed at the gas outlet of the tunneling face inside the mine, and is connected to external fixed equipment through the connecting plate 19 and fixing hole 191 on the fixing plate 1. When a gas flow rate is generated and exceeds 3m³ / h, the device will detect the gas flow. 3 / min (less than or equal to 3m) 3At a speed of / min (without prominent danger), gas enters the interior of the main gas pipe 2 through the intake pipe 6, driving the internal fan blades 7 to rotate. The fan blades 7 drive the worm gear 11 to perform circular motion. The worm gear 11 drives the main rotating shaft 14 to rotate through the worm wheel 12. The main rotating shaft 14 drives the rotating disk 8 at one end to rotate. The rotating disk 8 strikes the horizontal striking plate 4 through the outer swing shaft 9 and the striking block 10, producing a knocking sound. The knocking sound indicates that gas is passing through. Since there are two horizontal striking plates 4, and the vertical plate 3 can be connected through the insertion rod 20... The rotating disc 8 is mounted on one side of the fixed plate 1. Under the action of the counterweight 16 below, it forms a reciprocating swing effect, so that multiple striking blocks 10 on the outer side of the rotating disc 8 can contact the transverse striking plate 4 in sequence to produce a striking sound. When the gas flow rate is higher, the fan blade 7 rotates faster, so the striking blocks 10 strike the transverse striking plate 4 more frequently, and the striking sound is more urgent. This allows monitoring personnel to judge abnormal gas concentration through changes in sound, deal with it in time, reduce the excessive use of electrical equipment in the mine to generate sparks, and ensure the safety of the mine.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mine gas monitoring and early warning device, characterized in that, It includes two symmetrically spaced fixed plates, with a hollow gas pipe inserted between the two fixed plates. The front end of the gas pipe is connected to a first conical connecting pipe and a second conical connecting pipe in sequence. The second conical connecting pipe is also connected to an air inlet pipe. The rear end of the gas pipe is connected to the conical pipe. Multiple rotating shafts are installed inside the gas main pipe. Each rotating shaft has multiple fan blades fixed on its outer circumference along the circumferential direction. Each rotating shaft is fixedly connected to a worm gear. A worm wheel is connected above the worm gear through a threaded drive. The main rotating shaft is inserted into the center of all the worm wheels. A hollow side power tube is fixed axially on one side of the outer circumference of the gas main pipe, and the worm, worm wheel and main rotating shaft are all placed in the side power tube. A secondary rotating shaft is fixedly installed at the tail end of the main rotating shaft. A rotating disk is fixedly sleeved on the outer circumferential surface of the middle part of the secondary rotating shaft. Multiple swing shafts are fixed along the circumferential direction on the outside of the rotating disk. A striking block is fixed at the end of each swing shaft away from the rotating disk. A vertical plate is provided on the side of the rotating disk near the gas main pipe. One end of the insertion rod is rotatably connected to the upper part of the vertical plate. The other end of the insertion rod is inserted and fixed to the fixed plate. Horizontal striking plates are provided at the upper and lower ends of the vertical plate. When the rotating disk drives the striking block to rotate, the striking block slides in contact with the horizontal striking plate.

2. The mine gas monitoring and early warning device of claim 1, wherein, Each of the fixed plates has a connecting plate at both the upper and lower ends of its middle section, and each connecting plate has a fixing hole.

3. The mine gas monitoring and early warning device as described in claim 1, characterized in that, The worm gear passes through the main gas pipe and is connected to the rotating shaft.

4. The mine gas monitoring and early warning device as described in claim 1, characterized in that, The width of the striking block is smaller than the width of the horizontal striking plate, and the upper surface of the horizontal striking plate is a ceramic plate.

5. The mine gas monitoring and early warning device of claim 1, wherein, A counterweight is rotatably mounted at the bottom of the vertical plate. A groove is provided on the side of the gas main pipe adjacent to the vertical plate. The counterweight is slidably placed in the groove. The thickness of the counterweight is less than the thickness of the gas main pipe groove.

6. The mine gas monitoring and warning device of claim 1, wherein, Two support plates are spaced apart on the main rotating shaft. The two support plates are rotatably connected to the main rotating shaft, and the tops of the two support plates are fixed to the top surface inside the side power pipe.

7. The mine gas monitoring and early warning device as described in claim 1, characterized in that, The fan blade is a semi-elliptical plate, with symmetrical arc-shaped grooves on the top of the front and rear faces of the semi-elliptical plate, and an inwardly concave arc surface on the lower part of each arc-shaped groove.

8. The mine gas monitoring and warning device of claim 1, wherein, The thinner ends of the first tapered connecting tube and the second tapered connecting tube are joined together, and the whole tube is shaped like an hourglass after joining.

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