Explosion-proof device for underground coal mine

Abstract

The invention discloses an explosion-proof device for an underground coal mine. The explosion-proof device comprises a base; the suction device comprises a suction cylinder mounted on the base, a column frame is mounted on the suction cylinder, and an adsorption device is further arranged in the column frame; the early warning device comprises a plurality of side shell covers and an elliptical filter cylinder, the side shell covers are distributed along the circumference of the outer side of the column frame, opposite outer filter holes and inner filter holes are distributed in the cylinder wall of the elliptical filter cylinder, the inner filter holes are covered with the side shell covers, suction ports used for communicating the column frame with the inner filter holes are formed in the side shell covers, and a mist spray pipe is arranged at the axis of the elliptical filter cylinder; a cleaning mechanism is arranged on the mist spraying pipe, a monitoring box used for collecting pulverized coal is arranged at the lower end of the side shell cover, a liquid inlet pipe connected with the mist spraying pipe is arranged in the monitoring box, the accuracy and reliability of abnormal judgment of the coal dust concentration are improved, and concentration monitoring and trend early warning are achieved.

Description

Technical Field

[0001] This invention relates to the field of underground coal mine safety technology, specifically to an explosion-proof device for underground coal mines. Background Technology

[0002] Coal dust is generated during underground coal mining. High concentrations of coal dust not only seriously endanger miners' occupational health (leading to pneumoconiosis), but also form explosive mixtures when mixed with underground gas. Currently, coal dust control in coal mines mainly relies on passive or decentralized methods such as ventilation dilution, spraying water, and dust collector suction. However, existing technologies have significant shortcomings: 1) They mainly rely on manual fixed-point sampling or a few fixed sensors, which cannot achieve comprehensive, real-time, and online accurate perception of coal dust concentration at the working face, resulting in blind spots and delays in early warning; 2) Traditional dust removal equipment is mostly fixed or has a limited air volume, making it difficult to flexibly deploy with the mining process, and it lacks the ability to efficiently capture fine respirable dust; 3) Dust removal, monitoring, and early warning links are often independent of each other, lacking linkage, and equipment is prone to efficiency degradation due to blockage. Maintenance relies on manual labor, making it impossible to achieve adaptive cleaning and continuous efficient operation; 4) Most devices only focus on dust removal, lacking further purification measures for trace amounts of harmful gases (such as gas and hydrogen sulfide) that may remain in the filtered air.

[0003] Therefore, it is necessary to provide an explosion-proof device for use in underground coal mines to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: an explosion-proof device for use in underground coal mines, comprising:

[0005] Base;

[0006] The suction device includes a suction cylinder mounted on a base, a column frame mounted on the suction cylinder, and an adsorption device provided in the column frame.

[0007] The early warning device includes a side shell cover and an elliptical filter cylinder. Multiple side shell covers are arranged around the outer circumference of the column frame. The elliptical filter cylinder has opposing outer and inner filter holes distributed on its cylinder wall, and the side shell cover covers the inner filter holes. The side shell cover is provided with a suction port for connecting the column frame and the inner filter holes. A mist spray pipe is provided at the axis of the elliptical filter cylinder. A cleaning mechanism is provided on the mist spray pipe. A monitoring box for collecting coal dust is provided at the lower end of the side shell cover. The monitoring box is provided with a liquid inlet pipe connected to the mist spray pipe.

[0008] Furthermore, the monitoring box is equipped with an elliptical baffle, which forms an inner monitoring cavity and an outer monitoring cavity with the inner and outer sides of the elliptical filter cylinder, respectively. An inner filter tray slides on the wall of the inner monitoring cavity, and the inner filter tray is connected to the bottom of the inner monitoring cavity by an inner spring. An inner weight sensor is installed on the inner spring, and an inner drain pipe is also connected to the bottom of the inner monitoring cavity. An outer filter tray slides on the wall of the outer monitoring cavity, and the outer filter tray is connected to the bottom of the outer monitoring cavity by an outer spring. An outer weight sensor is installed on the outer spring, and an outer drain pipe is also connected to the bottom of the outer monitoring cavity.

[0009] Furthermore, the cleaning mechanism includes a cleaning screw blade that rotates and is fitted onto the outer wall of the mist nozzle, with a second fan blade in its middle.

[0010] Furthermore, the cleaning screw blade is provided with a transverse and centrally symmetrical spring telescopic rod at its end, with a roller rotating at its outer end that rolls along the inner wall of the elliptical filter cylinder, and a brush strip fixed at its outer end that contacts the inner wall of the elliptical filter cylinder.

[0011] Furthermore, the inner wall of the elliptical filter cylinder is also provided with an internal groove corresponding to the brush bar, and a side spray pipe connected to the mist spray pipe is installed on the internal groove.

[0012] Furthermore, the column frame is provided with a flexible filter sheet corresponding to the suction port, and the flexible filter sheet is provided with a tension sensor to monitor its tension.

[0013] Furthermore, the adsorption device includes:

[0014] The orifice plate is located at the upper end of the suction cylinder;

[0015] The material conveying cylinder is connected to the upper end of the column frame and the orifice plate at its upper and lower ends, respectively, and the upper and lower ends are respectively provided with an upper opening and a lower opening, and the inside of the column frame is filled with adsorption balls.

[0016] A shaft rotates and passes through the middle of the orifice plate. A fan blade is provided on the shaft at the lower end of the orifice plate, and a material conveying screw is provided on the shaft at the upper end of the orifice plate.

[0017] Furthermore, the upper end of the column frame is also provided with a baffle that covers the upper opening.

[0018] Furthermore, the column frame is provided with a turntable for mounting the side shell cover.

[0019] Compared with the prior art, the present invention provides an explosion-proof device for use in underground coal mines, which has the following beneficial effects:

[0020] This invention achieves comprehensive, real-time, and online intelligent monitoring and early warning. By uniformly deploying multiple early warning devices along the circumference and combining them with an elliptical filter structure design, the density of spatial monitoring points is greatly increased, enabling comprehensive monitoring of coal dust concentration in a 360-degree space around the device. By using weight sensors in the inner and outer monitoring chambers and tension sensors in the flexible filter to perform dual-parameter (weight growth curve and airflow resistance) fusion analysis, the accuracy and reliability of judging abnormal coal dust concentration are improved, achieving a leap from concentration monitoring to trend early warning.

[0021] This invention employs a multi-stage synergistic purification process involving mechanical interception (external filter holes), coagulation and enhanced capture (atomized spray), secondary interception (internal filter holes), and deep adsorption (adsorption balls). It is particularly effective in treating coal dust of different particle sizes (especially respirable fine dust that is difficult to capture) in a stepped manner, significantly improving the overall dust removal efficiency. Spray coagulation can effectively capture fine dust, and the adsorption device can further remove harmful gases. Through the conveying screw blades in the adsorption device, the adsorption balls generate a slow and continuous micro-circulation motion. On the one hand, this effectively prevents the adsorption bed from caking due to static or damp conditions, maintaining a uniform airflow channel. On the other hand, by continuously renewing the gas-solid contact surface, it improves the utilization efficiency of the adsorbent, extends its service life, and ensures the continuity of the deep purification effect.

[0022] This invention, through the setting of a cleaning mechanism, utilizes its own airflow drive to simultaneously achieve scraping and cleaning of the surface of the mist nozzle, sweeping and cleaning of the inner wall and filter holes of the elliptical filter cylinder, and reverse rinsing of the cleaning brush strips themselves. This fundamentally avoids equipment performance degradation and monitoring distortion caused by coal slime adhesion and filter hole blockage, ensuring that the device can operate with long-term, stable, and efficient maintenance-free or low-maintenance operation in harsh underground environments. It has full-process self-cleaning and self-maintenance capabilities, ensuring long-term stable operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the suction device structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the adsorption device structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the baffle structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the early warning device structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the mist nozzle structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the cleaning mechanism structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the cleaning screw blade structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the internal structure of the monitoring box of the present invention;

[0032] Figure 10 This is a schematic diagram of the external discharge pipe structure of the present invention;

[0033] Figure 11 This is a schematic diagram of the side nozzle structure of the present invention;

[0034] In the diagram: 1. Base; 2. Suction device; 3. Early warning device; 21. Suction cylinder; 22. Column frame; 23. Flexible filter sheet; 24. Tension sensor; 25. Turntable; 26. Adsorption device; 261. Perforated plate; 262. Material transfer cylinder; 263. Lower opening; 264. Upper opening; 265. Shaft; 266. Material transfer screw; 267. Fan blade one; 268. Baffle; 31. Side cover; 32. Elliptical filter cylinder; 33. Monitoring box; 34. Mist nozzle; 35. Cleaning mechanism; 311. Suction port; 321. External filter hole; 322. Internal filter hole; 323. Internal groove; 324. Side spray pipe; 331. Elliptical baffle; 332. Internal monitoring chamber; 333. External monitoring chamber; 3321. Internal filter tray; 3322. Internal spring; 3323. Internal weight sensor; 3324. Internal drain pipe; 3331. External filter tray; 3332. External spring; 3333. External weight sensor; 3334. External drain pipe; 341. Liquid inlet pipe; 351. Cleaning screw blade; 352. Second fan blade; 353. Spring telescopic rod; 354. Roller; 355. Brush strip. Detailed Implementation

[0035] Reference Figures 1-11 The present invention provides a technical solution: an explosion-proof device for use in underground coal mines, comprising:

[0036] Base 1;

[0037] The suction device 2 includes a suction cylinder 21 mounted on a base 1, a column frame 22 mounted on the suction cylinder 21, and an adsorption device 26 provided in the column frame 22.

[0038] The early warning device 3 includes a side shell cover 31 and an elliptical filter cylinder 32. Multiple side shell covers 31 are arranged around the outer circumference of the column frame 22. The elliptical filter cylinder 32 has opposing outer filter holes 321 and inner filter holes 322 distributed on its cylinder wall, and the side shell cover 31 covers the inner filter holes 322. The side shell cover 31 is provided with a suction port 311 for connecting the column frame 22 and the inner filter holes 322. A mist spray pipe 34 is provided at the axis of the elliptical filter cylinder 32. A cleaning mechanism 35 is provided on the mist spray pipe 34. A monitoring box 33 for collecting coal dust is provided at the lower end of the side shell cover 21. The monitoring box 33 is provided with a liquid inlet pipe 341 connected to the mist spray pipe 34.

[0039] In this embodiment, the suction device 2 is equipped with evenly distributed early warning devices 3 around its outer circumference to monitor the coal dust concentration in the underground mining space area of ​​the coal mine from all directions. In this embodiment, the column frame 22 is provided with a turntable 25 for installing the side shell cover 31. That is to say, by adjusting the rotation of the turntable 25, the position of the early warning devices 3 on the outside of the suction device 2 can be controlled in a timely and accurate manner. Specifically, when the early warning device 3 corresponding to a certain side space reaches the peak of coal dust concentration treatment in the corresponding side space area, the position of the early warning devices 3 that have not reached the peak treatment can be swapped by adjusting the rotation of the turntable 25, thereby improving the emergency response capability in response to emergencies.

[0040] In this embodiment, the elliptical structure of the elliptical filter cylinder 32 facilitates the increase in the number of early warning devices 3 distributed around the circumference, thereby improving the accuracy of monitoring the location of coal dust concentration in the space when processing the space. Specifically, during underground coal mining, the areas where coal dust and gas mixtures are generated may exist in the coal mine wall, mining face, goaf, etc. Therefore, by deploying early warning devices 3 in multiple directions, the situation of floating coal dust in the underground space of the coal mine can be improved, thereby determining whether there is leakage in a certain location area, thus providing timely warning and avoiding explosions caused by excessive coal dust concentration.

[0041] In this embodiment, the outer filter hole 321 performs initial filtration of the airflow from the external space through the cover of the side shell 31, and the inner filter hole 322 performs secondary filtration of the airflow passing through the outer filter hole 321, thereby accurately capturing coal dust particles in the airflow. Specifically, the outer filter hole 321 intercepts larger coal dust particles, which fall into the monitoring box 33. The mist nozzle 34 sprays mist, i.e., small floating water molecules, which are used to combine and aggregate with the small floating coal dust particles to form large particles or viscous large particles, which can then be intercepted by the inner filter hole 322 and fall into the monitoring box 33. The monitoring box 33 monitors the captured coal dust at high frequency, thereby determining the coal concentration in the airflow in the coal mine.

[0042] In this embodiment, the base 1 is configured as a movable structure, which is convenient to deploy to critical areas where the coal dust concentration is prone to exceed the standard. After the suction cylinder 21 is started, a stable negative pressure is generated in the column frame 22, which drives the gas in the surrounding space to be sucked in through multiple warning devices 3 arranged in a circle. The warning devices 3 perform two-stage filtration on the sucked gas, accurately capture coal dust particles of different sizes, and measure them in real time. The collected data is used to determine whether the coal dust concentration in the area is abnormal, thereby issuing a warning. At the same time, the cleaning mechanism 35 and the adsorption device 26 can ensure their long-term, stable and efficient operation and deeply purify the gas, thereby improving the air safety in the coal mine.

[0043] In this embodiment, the monitoring box 33 is provided with an elliptical baffle 331, which forms an inner monitoring cavity 332 and an outer monitoring cavity 333 with the inner and outer sides of the elliptical filter cylinder 32, respectively. An inner filter tray 3321 slides on the wall of the inner monitoring cavity 332. The inner filter tray 3321 is connected to the bottom of the inner monitoring cavity 332 by an inner spring 3322. An inner weight sensor 3323 is provided on the inner spring 3322. An inner drain pipe 3324 is also connected to the bottom of the inner monitoring cavity 332. An outer filter tray 3331 slides on the wall of the outer monitoring cavity 333. The outer filter tray 3331 is connected to the bottom of the outer monitoring cavity 333 by an outer spring 3332. An outer weight sensor 3333 is provided on the outer spring 3332. An outer drain pipe 3334 is also connected to the bottom of the outer monitoring cavity 333.

[0044] The outer monitoring chamber 333 is used to receive particles and fluids filtered and intercepted by the outer filter holes 321. The inner filter tray 3321 filters and holds the particles, collects coal dust, and monitors the curve of its weight increasing over time. The filtered fluid is discharged through the inner drain pipe 3324. The inner monitoring chamber 332 is used to receive particles and fluids filtered and intercepted by the inner filter holes 322. The outer filter tray 3331 filters and holds the particles, collects coal dust, and monitors the curve of its weight increasing over time. The filtered fluid is discharged through the outer drain pipe 3334. If abnormal fluctuations occur in the two curves over a long period of time, it indicates that there is an abnormal coal dust concentration in the space corresponding to the warning device 3 at the location of the monitoring box 33, thus issuing a warning.

[0045] In this embodiment, the cleaning mechanism 35 includes a cleaning screw blade 351 that is rotatably sleeved on the outer wall of the mist nozzle 34, and a fan blade 352 is provided in the middle. When the airflow passes through the outer filter hole 321 and the inner filter hole 322 on the elliptical filter cylinder 32, it can drive the fan blade 352 to rotate. The fan blade 352 can then drive the cleaning screw blade 351 to rotate, and the cleaning screw blade 351 can scrape and clean the surface of the mist nozzle 34 and guide the flow downward. On the one hand, this avoids the nozzle of the mist nozzle 34 from becoming blocked, and on the other hand, it promptly removes the coal dust adhering to the mist nozzle 34 and makes it fall into the monitoring box 33, so as to improve the accuracy of coal dust content and concentration monitoring.

[0046] In this embodiment, the cleaning screw blade 351 is provided with a transversely symmetrical spring telescopic rod 353 at its end. The outer end of the rod has a roller 354 that rolls along the inner wall of the elliptical filter cylinder 32. The outer end of the roller 354 is also fixed with a brush strip 355 that contacts the inner wall of the elliptical filter cylinder 32. When the cleaning screw blade 351 rotates, it can simultaneously drive the spring telescopic rod 353 to rotate axially, thereby driving the brush strip 355 to clean and brush the inner wall of the elliptical filter cylinder 32, maintaining the air permeability of the outer filter hole 321 and the inner filter hole 322. The elastic extension and contraction of the spring telescopic rod 353 ensures that the brush strip makes full contact with the inner wall of the elliptical filter cylinder 32. The setting of the roller 354 makes the brush strip 355 brushing along the inner wall of the elliptical filter cylinder 32 smoother.

[0047] In this embodiment, the inner wall of the elliptical filter cylinder 32 is also provided with an internal groove 323 corresponding to the brush bar 355. A side spray pipe 324 communicating with the mist spray pipe 34 is installed on the internal groove 323. That is to say, in addition to providing water molecules of mist to the inside of the elliptical filter cylinder 32, the side spray pipe 324 can also clean the brush bar 355 when the brush bar 355 moves to the side spray pipe 324, thereby maintaining the cleanliness of the brush bar 355.

[0048] In this embodiment, the column frame 22 is provided with a flexible filter 23 corresponding to the suction port 311. The flexible filter 23 is provided with a tension sensor 24 for monitoring its tension. That is to say, when judging the coal powder concentration in the airflow of a certain location area by monitoring the coal powder weight growth curve, the tension of the flexible filter 23 can be further used for judgment. Specifically, when the coal powder concentration at a certain location increases abnormally, the air permeability of the inner filter hole 322 and the outer filter hole 321 corresponding to that location decreases. Therefore, the column frame 22 continues to draw in gas, thereby increasing the tension of the corresponding flexible filter 23. By combining the tension change of the flexible filter 23, the monitoring accuracy of the early warning device 3 can be further improved.

[0049] In this embodiment, the adsorption device 26 includes:

[0050] The orifice plate 261 is located at the upper end of the suction cylinder 21;

[0051] The material conveying cylinder 262 is connected to the upper end of the column frame 22 and the orifice plate 261 at its upper and lower ends respectively, and the upper and lower ends are respectively provided with an upper opening 263 and a lower opening 264, and the column frame 22 is filled with adsorption balls.

[0052] The shaft 265 rotates and passes through the middle of the orifice plate 261. A fan blade 267 is provided on the shaft 265 at the lower end of the orifice plate 261, and a material conveying screw blade 266 is provided on the shaft 265 at the upper end of the orifice plate 261.

[0053] The adsorption balls are filled in the space below the flexible filter 23 to prevent the adsorption balls from squeezing the flexible filter 23;

[0054] In this embodiment, the adsorption balls can further remove harmful gases from the gas flowing into the column frame 22, thereby ensuring the safety of the underground space in the coal mine. Specifically, the adsorption balls are filled in the column frame 22, and the gas in the suction cylinder 21 can drive the fan blade 267 to rotate, thereby driving the shaft 265 to rotate. The shaft 265 drives the conveying screw 266 to rotate, and the conveying screw continuously conveys the adsorption balls at the lower opening 264 upwards and discharges them through the upper opening 263, increasing the gap between the filled adsorption balls and facilitating full contact of the gas with the surface of the adsorption balls.

[0055] In this embodiment, the upper end of the column frame 22 is also provided with a baffle 268 covering the upper opening 263 to reduce the impact of the adsorption ball on the flexible filter 23.

[0056] In practical implementation, its working principle is as follows:

[0057] S1: The suction cylinder 21 is started, forming a stable negative pressure zone in the column frame 22. Under the action of negative pressure, the coal dust-containing gas in the well flows from the outside of the elliptical filter cylinder 32 of each early warning device 3, first through the external filter hole 321. The external filter hole 321 intercepts the larger coal dust particles in the airflow. The intercepted particles fall downward into the outer monitoring cavity 333 of the monitoring box 33 under the action of gravity.

[0058] S2: Gas entering the cavity formed by the elliptical filter cylinder 32 and the side shell 31 through the outer filter hole 321. The mist nozzle 34 continuously sprays fine water mist (small molecule water mist) into the cavity. The fine coal powder particles suspended in the gas that are difficult to filter collide, combine and agglomerate with the water mist to form larger or moist agglomerates. The agglomerates enter the inner filter hole 322 with the airflow and are effectively intercepted. The agglomerates and residual particles intercepted by the inner filter hole 322 finally fall into the inner monitoring cavity 332 of the monitoring box 33.

[0059] S3: Coal dust falling into the outer monitoring chamber 333 is supported by the outer filter tray 3331, and coal dust falling into the inner monitoring chamber 332 is supported by the inner filter tray 3321. The outer spring 3332 and the inner spring 3322 will compress due to the increase in weight. The outer weight sensor 3333 and the inner weight sensor 3323 monitor the force (i.e., the weight of coal dust collected) in real time and continuously record the growth curve of the weight of coal dust inside and outside each warning device over time. The flexible filter 23 and tension sensor 24 at each suction port 311 of the column frame 22 detect when the air permeability of the filter holes of a certain warning device decreases due to coal dust accumulation. When the airflow resistance increases at that location, and the suction negative pressure remains constant, the inward concave deformation (tension) of the flexible filter 23 at that location will change. The tension sensor 24 records this change. By comprehensively analyzing the slope of the coal powder weight growth curve (collection amount per unit time) and the change in the tension of the flexible filter, if the weight at a certain location monitoring point shows an abnormally rapid increase in a short period of time, and the corresponding flexible filter tension increases significantly at the same time, the system determines that the coal powder concentration in that location area is abnormally high and there is a safety hazard. It immediately issues an early warning signal to remind staff to pay attention to the area and can also link the ventilation and dust removal system.

[0060] S4: The airflow passing through the filter holes of the elliptical filter cylinder 32 will drive the fan blade 352 in the cleaning mechanism 35 to rotate. The fan blade 352 drives the cleaning screw blade 351 to rotate, scraping the surface of the mist nozzle 34 to prevent its nozzle from being blocked by coal sludge, and guiding the scraped-off deposits downward. The cleaning screw blade 351 simultaneously drives the spring telescopic rod 353 and the brush strip 355 at its end to roll and sweep along the inner wall of the elliptical filter cylinder 32 to prevent the filter holes from being blocked and maintain air permeability. The roller 354 ensures smooth movement. When the brush strip 355 moves to the position of the built-in groove 323, the water mist sprayed from the side nozzle 324 cleans it in the reverse direction, keeping the brush strip itself clean. The filtered liquid in the monitoring box is discharged in an orderly manner through the inner drain pipe 3324 and the outer drain pipe 3334 respectively.

[0061] S5: The gas filtered by the early warning device enters the column frame 22 for final processing. The column frame 22 is filled with adsorption balls (such as activated carbon, modified alumina, etc.). When the gas flows through, the residual harmful gases (such as trace amounts of methane, hydrogen sulfide, etc.) and moisture are further adsorbed and removed. The airflow drives the fan blade 267 to rotate. The fan blade 267 drives the conveyor screw 266 to rotate through the shaft 265. The conveyor screw 266 continuously and slowly conveys the adsorption balls at the bottom upwards and discharges them through the upper opening 263. They are scattered on the top of the adsorption ball bed, which enhances the micro-movement between the adsorption ball particles and effectively prevents them from hardening due to long-term static and damp conditions. It maintains uniform gaps, ensures airflow permeability and adsorption efficiency, and the baffle 268 buffers the falling adsorption balls.

[0062] S6: When an early warning of extremely high risk in a certain direction is issued, the operator can remotely or locally control the turntable 25 to rotate, which can swap the position of the early warning device that is already under high load (the filter holes are becoming clogged and the coal dust collection volume is large) with the early warning device that is under low load. This ensures that the device can dynamically allocate monitoring and processing resources when dealing with local sudden high concentrations of coal dust, thereby improving the overall emergency endurance and the reliability of monitoring coverage.

[0063] This device forms a complete closed-loop working cycle of intake, filtration, monitoring, cleaning, and purification, enabling real-time, online, and multi-directional monitoring and pretreatment of coal dust concentration and air quality in local underground spaces, improving the inherent safety level of underground working faces, and can be flexibly deployed in key risk areas such as tunneling heads, mining faces, and transfer points.

[0064] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An explosion-proof device for use in underground coal mines, characterized in that, It includes: Base (1); Suction device (2), including suction cylinder (21) mounted on base (1), suction cylinder (21) is provided with column frame (22), and suction device (26) is further arranged in column frame (22); Early warning device (3), including side shell cover (31), elliptical filter cylinder (32), a plurality of side shell covers (31) are arranged along the outer side of column frame (22), and the cylinder wall of elliptical filter cylinder (32) is distributed with opposite outer filter hole (321) and inner filter hole (322), and the side shell cover (31) covers the inner filter hole (322), the suction port (311) for connecting column frame (22) and inner filter hole (322) is arranged on the side shell cover (31), and the mist spray pipe (34) is arranged at the axis of elliptical filter cylinder (32), the cleaning mechanism (35) is arranged on the mist spray pipe (34), the monitoring box (33) for collecting coal powder is arranged at the lower end of side shell cover (21), and the inlet pipe (341) connected with mist spray pipe (34) is arranged in monitoring box (33).

2. The explosion-proof device for underground coal mine according to claim 1, characterized in that, The monitoring box (33) is provided with an elliptical blocking cylinder (331), which forms an inner monitoring cavity (332) and an outer monitoring cavity (333) on the inner and outer sides of the elliptical filter cylinder (32) respectively, the inner filter tray (3321) is slidably arranged on the cavity wall of the inner monitoring cavity (332), the inner filter tray (3321) is connected with the cavity bottom of the inner monitoring cavity (332) through the inner spring (3322), the inner weight sensor (3323) is arranged on the inner spring (3322), and the inner discharge pipe (3324) is further connected with the cavity bottom of the inner monitoring cavity (332). The outer filter tray (3331) is slidably arranged on the cavity wall of the outer monitoring cavity (333), the outer filter tray (3331) is connected with the cavity bottom of the outer monitoring cavity (333) through the outer spring (3332), the outer weight sensor (3333) is arranged on the outer spring (3332), and the outer discharge pipe (3334) is further connected with the cavity bottom of the outer monitoring cavity (333).

3. The explosion-proof device for underground coal mine of claim 1, wherein, The cleaning mechanism (35) includes a cleaning spiral blade (351) sleeved on the outer wall of the mist spray pipe (34), and a fan blade (352) is arranged at the middle part thereof.

4. The explosion-proof device for underground coal mine of claim 3, wherein, The cleaning spiral blade (351) is provided with a horizontally and centrally symmetric spring telescopic rod (353) at the end, a roller (354) is rotatably arranged at the outer end of the spring telescopic rod (353) and rolls along the inner wall of the elliptical filter cylinder (32), and a brush strip (355) is further fixed at the outer end of the spring telescopic rod (353) and contacts the inner wall of the elliptical filter cylinder (32).

5. The explosion-proof device for underground coal mine of claim 4, wherein, The inner wall of the elliptical filter cylinder (32) is further provided with an embedded groove (323) corresponding to the brush strip (355), and the side spray pipe (324) connected with the mist spray pipe (34) is arranged on the embedded groove (323).

6. The explosion-proof device for underground coal mine of claim 1, wherein, The column frame (22) is provided with a flexible filter sheet (23) corresponding to the suction port (311), and a tension sensor (24) for monitoring the tension of the flexible filter sheet (23) is arranged on the flexible filter sheet (23).

7. The explosion-proof device for underground coal mine of claim 1, wherein, The suction device (26) includes: Hole disc (261) arranged on the upper end of suction cylinder (21); Material conveying cylinder (262), the upper end and the lower end of which are connected with the upper end of column frame (22) and hole disc (261) respectively, and the upper end and the lower end of which are provided with upper port (263) and lower port (264) respectively, and the inside of column frame (22) is filled with adsorption ball; A shaft (265) is rotatably and penetratively arranged in the middle of the hole disc (261), and a fan blade (267) is arranged on the shaft (265) at the lower end of the hole disc (261), and a material conveying spiral blade (266) is arranged on the shaft (265) at the upper end of the hole disc (261).

8. The explosion-proof device for underground coal mine of claim 7, wherein, The upper end of the column frame (22) is further provided with a blocking cylinder (268) covering the upper opening (263).

9. The explosion-proof device for underground coal mine of claim 1, wherein, The column frame (22) is provided with a rotating disc (25) for mounting a side shell cover (31).

Images