A safety ventilation device for coal mines

Abstract

This invention relates to the field of coal mine ventilation, specifically a safety ventilation device for coal mines. It includes an inlet pipe, a connecting pipe, an outlet pipe, a baffle, a switching mechanism, and a dust collection assembly. The connecting pipe has an inlet end and an outlet end at its horizontal ends, with the bottom end serving as the dust discharge end. The inlet pipe connects to the inlet end of the connecting pipe, and inside the inlet pipe, along the direction away from the connecting pipe, a filter and a fan are sequentially arranged. The filter is rotatably mounted inside the inlet pipe via a pivot. The outlet pipe connects to the outlet end of the connecting pipe. The dust collection assembly connects to the dust discharge end of the connecting pipe. One end of the baffle is rotatably mounted inside the connecting pipe via a pivot. During filtration ventilation, the switching mechanism adjusts the filter to a vertical position and the baffle to a horizontal position. During backflushing cleaning, the switching mechanism adjusts the baffle to a vertical position and rotates the filter by 180 degrees. This invention can clean the filter by backflushing and automatically collect the blown-off dust, resulting in high cleaning efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal mine ventilation, and in particular to a safety ventilation device for coal mines. Background Technology

[0002] When coal seams are far from the surface in a coal mine, underground tunnels are typically excavated for mining. This process generates a large amount of dust, seriously threatening the lives of underground workers. Therefore, coal mine ventilation systems are necessary to ventilate the mine.

[0003] Chinese Patent Publication No. CN217558369U discloses a safety ventilation device for coal mines. The ventilation duct is equipped with a ventilation fan, and a dust collection box is fixedly connected to one side of the ventilation duct. The first filter plate and the second filter plate are both inserted and snapped into the inside of the slot. The second gate is fixed to the inside of the dust collection box. The first gate is slidably snapped into the inside of the sliding groove. The threaded rod is threaded into the threaded hole opened on one side of the threaded seat. The device uses an insertion and fixing method to fix the dust collection components. When cleaning and replacing the filter screen, it is only necessary to pull the first filter plate and the second filter plate out of the slot on one side of the dust collection box to remove them and clean and replace the filter screen.

[0004] However, the above technical solution has the following shortcomings: the dust removal components and the filter screen can only be manually disassembled and cleaned, resulting in low cleaning efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a safe ventilation device for coal mines, which can clean the filter screen by back-blowing and automatically collect the blown-off dust, with high cleaning efficiency.

[0006] The technical solution of this invention provides a safety ventilation device for coal mines, comprising an inlet pipe, a connecting pipe, an outlet pipe, a baffle, a switching mechanism, and a dust collection assembly. The connecting pipe has an inlet end and an outlet end at its horizontal ends, with the bottom end serving as the dust discharge end. The inlet pipe connects to the inlet end of the connecting pipe, and a filter and a fan are sequentially arranged inside the inlet pipe along the direction away from the connecting pipe. The filter is rotatably mounted inside the inlet pipe via a rotating shaft. The outlet pipe connects to the outlet end of the connecting pipe. The dust collection assembly connects to the dust discharge end of the connecting pipe. One end of the baffle is rotatably mounted inside the connecting pipe via a rotating shaft. During filtration ventilation, the switching mechanism adjusts the filter to a vertical position and the baffle to a horizontal position. At this time, the inlet and outlet ends of the connecting pipe are connected, and the baffle isolates the dust discharge end. During backflushing cleaning, the switching mechanism adjusts the baffle to a vertical position and rotates the filter by 180 degrees. At this time, the inlet and outlet ends of the connecting pipe are connected, and the baffle isolates the outlet end.

[0007] Preferably, when switching from the filtration and ventilation state to the backflushing and cleaning state, the baffle first rotates counterclockwise from the horizontal state to the vertical distribution state, and then the filter screen rotates 180 degrees. When switching from the backflushing and cleaning state to the filtration and ventilation state, the filter screen first rotates 180 degrees in the opposite direction, and then the baffle rotates clockwise from the vertical state to the horizontal distribution state.

[0008] Preferably, the switching mechanism includes two sets of switching components that are respectively linked to rotating shaft one and rotating shaft two, and a driving component that drives the two sets of switching components. The switching component includes a gear, a mounting shaft, a cam, a roller, a wheel frame, a slide column, a rack, and a bracket. The gear and the rack are meshed together. The cam is mounted on the mounting shaft and has a guide groove. The roller rolls in the guide groove and is rotatably mounted on the wheel frame. The wheel frame and the rack are respectively mounted at both ends of the slide column. The slide column is slidably mounted on the bracket. The two cams in the two sets of switching components rotate in the same direction but face opposite directions. The two mounting shafts in the two sets of switching components are rotatably mounted on the air inlet pipe and the connecting pipe, respectively, and the two brackets are respectively mounted on the air inlet pipe and the connecting pipe.

[0009] Preferably, the two gears in the two sets of switching components are gear one and gear two, gear one is mounted on shaft one and gear two is mounted on shaft two, and the gear ratio of gear one and gear two is 2:1.

[0010] Preferably, the guide groove is an annular groove, including a semi-circular annular groove coaxially distributed with the mounting shaft and a semi-convex annular groove connecting the two ends of the semi-circular annular groove. On the inner side surface of the semi-convex annular groove along the contour from one end to the other, the distance from the semi-convex annular groove to the mounting shaft first increases and then decreases.

[0011] Preferably, the semi-convex annular groove includes a toothed groove in the middle and two connecting grooves, each connecting groove connecting one end of the toothed groove to one end of the adjacent semi-circular annular groove.

[0012] Preferably, the side of the baffle is an arc-shaped air guide surface. When the baffles are horizontally distributed, the air guide surface is located at the bottom of the baffle. When the baffles are vertically distributed, the air guide surface faces the air inlet end of the connecting pipe.

[0013] Preferably, the dust collection assembly includes a filter bag and a screw cylinder disposed at the top of the filter bag. The screw cylinder is threadedly connected to the dust discharge end of the connecting pipe, and the dust discharge end of the connecting pipe is threadedly connected to an anti-detachment sleeve that secures the screw cylinder.

[0014] Preferably, an installation frame is provided inside the dust discharge end of the connecting pipe, and a rotating drum is rotatably provided at the bottom of the installation frame. Multiple tapping plates for tapping the filter bags are evenly arranged around the circumference of the rotating drum.

[0015] Compared with existing technologies, the present invention has the following beneficial technical effects: The present invention can clean the filter screen by backflushing and automatically collect the blown-off dust. Cleaning can be performed without removing the filter screen, resulting in high cleaning efficiency, and the fan does not need to be shut down during the entire process. When switching from the filtration ventilation state to the backflushing cleaning state, the baffle is first rotated to its position, and then the filter screen is rotated 180 degrees. The fan backflushes the filter screen to blow off the dust, which is then collected by the dust collection assembly. When switching from the backflushing cleaning state to the filtration ventilation state, the filter screen is first reversed and reset, and then the baffle is reversed and reset. The fan blows air towards the filter screen, filtering the dust and providing ventilation for the coal mine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0017] Figure 2 This is a partial structural cross-sectional view of an embodiment of the present invention in the filtering and ventilation state;

[0018] Figure 3 This is a partial structural cross-sectional view of an embodiment of the present invention in a backflushing cleaning state;

[0019] Figure 4 This is a schematic diagram illustrating the reciprocating movement principle of a rack;

[0020] Figure 5 A partial structural cross-sectional view for dust collection;

[0021] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle.

[0022] Reference numerals in the attached diagram: 1. Inlet pipe; 2. Connecting pipe; 3. Outlet pipe; 4. Fan; 5. Baffle; 51. Air guide surface; 6. Filter screen; 7. Motor; 8. Drive shaft; 9. Synchronous belt pulley; 10. Shaft 1; 11. Gear 1; 12. Shaft 2; 13. Gear 2; 14. Mounting shaft; 15. Cam; 151. Guide groove; 1511. Semi-circular annular groove; 1512. Semi-convex annular groove; 15121. Connecting groove; 15122. Toothed groove; 16. Roller; 17. Wheel frame; 18. Sliding column; 19. Rack; 20. Bracket; 21. Mounting bracket; 22. Rotary drum; 23. Knocking plate; 24. Screw barrel; 25. Filter bag; 26. Anti-detachment sleeve; 27. Mounting cover. Detailed Implementation

[0023] Example 1, as Figures 1-6 As shown in the figure, the safety ventilation device for coal mines proposed in this embodiment includes an air inlet pipe 1, a connecting pipe 2, an air outlet pipe 3, a baffle 5, a switching mechanism, and a dust collection assembly.

[0024] like Figure 2As shown, the two horizontal ends of the connecting pipe 2 are the air inlet and air outlet, respectively, and the bottom end of the connecting pipe 2 is the dust discharge end.

[0025] like Figures 1-3 As shown, the air outlet duct 3 is connected to the air outlet end of the connecting pipe 2, and the air inlet duct 1 is connected to the air inlet end of the connecting pipe 2. Inside the air inlet duct 1, a filter screen 6 and a fan 4 are arranged sequentially along the direction away from the connecting pipe 2. The filter screen 6 is rotatably mounted inside the air inlet duct 1 via a rotating shaft 12 at the center of its side, and the filter screen 6 can reciprocate within a 180-degree range. The fan 4 faces the filter screen 6 and blows air onto it. When the filter screen 6 is in the dust filtering state, it can filter the dust blown in by the fan 4. The filtered air is transported to the air outlet duct 3 through the connecting pipe 2 and finally discharged from the air outlet duct 3.

[0026] like Figures 1-3 As shown, the dust collection component is connected to the dust discharge end of the connecting pipe 2, and can collect the dust cleaned off the filter screen 6.

[0027] like Figure 2 and Figure 3 As shown, one end of the baffle 5 is rotatably installed inside the connecting pipe 2 via a rotating shaft 10, and the baffle 5 can reciprocate within a 90-degree range.

[0028] During filtration and ventilation, the switching mechanism adjusts the filter 6 to a vertical position and the baffle 5 to a horizontal position. At this time, the air inlet and outlet of the connecting pipe 2 are connected, and the baffle 5 isolates the dust discharge end (i.e., seals the top of the dust discharge end). The fan 4 blows air onto the filter 6, and the filter 6 filters the dust. The air after filtering the dust flows through the connecting pipe 2 to the air outlet 3 and does not flow downwards from the connecting pipe 2 into the dust collection assembly. During backflushing cleaning, the switching mechanism adjusts the baffle 5 to a vertical position and rotates the filter 6 180 degrees. The side of the filter 6 with dust adhering to it rotates to the side opposite to the fan 4. At this time, the air inlet and dust discharge end of the connecting pipe 2 are connected, and the baffle 5 isolates the air outlet end (i.e., seals the right side of the air outlet end). The fan 4 blows air onto the filter 6, blowing away the dust on the back of the filter 6. The air mixed with dust flows from the dust discharge end of the connecting pipe 2 to the dust collection assembly, which collects the dust. Specifically, when switching from the filtration ventilation state to the backflushing cleaning state, the baffle 5 first rotates counterclockwise from a horizontal position to a vertical position, and then the filter screen 6 rotates 180 degrees. When switching from the backflushing cleaning state to the filtration ventilation state, the filter screen 6 first rotates 180 degrees in the opposite direction, and then the baffle 5 rotates clockwise from a vertical position to a horizontal position. That is, before backflushing cleaning, the baffle 5 rotates into position before the filter screen 6, so that the dust generated by the fan 4 backflushing the filter screen 6 can effectively enter the dust collection assembly through the dust discharge end of the connecting pipe 2; after reversing and resetting, the baffle 5 rotates into position after the filter screen 6, which also ensures that the dust blown off the filter screen 6 by the fan 4 can effectively enter the dust collection assembly. The fan 4 is in a continuous operating state, capable of coal mine ventilation and backflushing cleaning of the filter screen 6.

[0029] like Figures 2-4 As shown, the switching mechanism includes two sets of switching components that are respectively linked to rotating shaft 10 and rotating shaft 12, as well as a drive component that drives the two sets of switching components. The two sets of switching components are located on the outside of the air inlet pipe 1 and the connecting pipe 2, respectively. The switching components include a gear, a mounting shaft 14, a cam 15, a roller 16, a wheel frame 17, a slide column 18, a rack 19, and a bracket 20. The gear meshes with the rack 19. The cam 15 is mounted on the mounting shaft 14 and has a guide groove 151. The roller 16 rolls in the guide groove 151 and is rotatably mounted on the wheel frame 17. The wheel frame 17 and the rack 19 are respectively mounted at both ends of the slide column 18. The slide column 18 is slidably mounted on the bracket 20. The two cams 15 in the two sets of switching components rotate in the same direction but face opposite directions. The two mounting shafts 14 in the two sets of switching components are rotatably mounted on the air inlet pipe 1 and the connecting pipe 2, respectively, and the two brackets 20 are respectively mounted on the air inlet pipe 1 and the connecting pipe 2. The drive assembly can simultaneously drive two mounting shafts 14 to rotate. The mounting shafts 14 drive the cam 15 to rotate. The cam 15 pushes and pulls the roller 16 through the guide groove 151. The roller 16 drives the slide column 18 to move through the wheel frame 17. The slide column 18 slides horizontally back and forth on the bracket 20, thereby driving the rack 19 to move back and forth. The rack 19 drives the gear to rotate back and forth.

[0030] The two gears in the two sets of switching components are gear 11 and gear 23. Gear 11 is mounted on shaft 10, and gear 23 is mounted on shaft 22. Gear 11 drives the baffle 5 to rotate via shaft 10, and gear 23 drives the filter screen 6 to rotate via shaft 22. The gear ratio of gear 11 to gear 23 is 2:1, which enables the baffle 5 to reciprocate within a 90-degree range and the filter screen 6 to reciprocate within a 180-degree range. The only difference between the two sets of switching components is that gear 11 and gear 23; the other parts are interchangeable.

[0031] The guide groove 151 is an annular groove, including a semi-circular annular groove 1511 coaxially distributed with the mounting shaft 14 and a semi-convex annular groove 1512 connecting the two ends of the semi-circular annular groove 1511. On the inner side of the semi-convex annular groove 1512, along the contour from one end to the other, the distance from the semi-convex annular groove 1512 to the mounting shaft 14 first increases and then decreases. In the filtration and ventilation state, the roller 16 in the switching assembly corresponding to the baffle 5 is located in the middle of the semi-convex annular groove 1512, and the roller 16 in the switching assembly corresponding to the filter screen 6 is located in the middle of the semi-circular annular groove 1511. In the backflushing cleaning state, the roller 16 in the switching assembly corresponding to the baffle 5 is located in the middle of the semi-circular annular groove 1511, and the roller 16 in the switching assembly corresponding to the filter screen 6 is located in the middle of the semi-convex annular groove 1512.

[0032] The specific steps for switching the operating status of the safety ventilation system used in this coal mine are as follows:

[0033] S1. In the initial filtration and ventilation state, the baffle 5 is positioned above the dust discharge end of the connecting pipe 2, maintaining the connection between the air inlet and outlet ends of the connecting pipe 2. The filter screen 6 is vertically distributed, with the side surface that performs the filtering function facing the fan 4.

[0034] S2. When cleaning filter 6, the drive assembly drives two sets of switching assemblies. In the switching assembly corresponding to baffle 5, cam 15 rotates 90 degrees counterclockwise, and roller 16 moves from the outermost end of semi-convex annular groove 1512 to one end of semi-circular annular groove 1511. Through roller 16, wheel frame 17 and sliding column 18, rack 19 is pulled to the right. Rack 19 drives gear 11 to rotate 90 degrees counterclockwise. Gear 11 drives baffle 5 to rotate 90 degrees counterclockwise through shaft 10. Baffle 5 rotates from the dust discharge end side of connecting pipe 2 to the air outlet side, connecting the air inlet end and dust discharge end of connecting pipe 2. At the same time, for the switching assembly corresponding to filter 6, cam 15 rotates 90 degrees counterclockwise, roller 16 moves in semi-circular annular groove 1511, rack 19 remains in the same position, gear 2 13 and shaft 2 12 remain stationary, and filter 6 remains stationary. During this process, fan 4 remains in operation.

[0035] S3. The drive assembly continues to drive the two sets of switching assemblies. In the switching assembly corresponding to the baffle 5, the cam 15 rotates 90 degrees counterclockwise, the roller 16 moves in the semi-circular groove 1511, and the rack 19, gear 11, shaft 10 and baffle 5 remain stationary, with the baffle 5 remaining vertical. At the same time, for the switching assembly corresponding to the filter screen 6, the cam 15 rotates 90 degrees counterclockwise, the roller 16 moves from one end of the semi-circular groove 1511 to the outermost end (middle position) of the semi-convex groove 1512, the rack 19 moves to the left to its limit position, and the rack 19 drives the gear 13 to rotate. The gear 13 drives the filter screen 6 to rotate 180 degrees clockwise through the shaft 12. At this time, the switching from the filtration ventilation state to the back-blowing cleaning state is completed. The fan 4 blows air onto the filter screen 6, and the dust blown off the filter screen 6 is blown into the dust collection assembly through the dust discharge end of the connecting pipe 2.

[0036] After S4 and filter 6 are cleaned, the drive assembly continues to drive the two sets of switching assemblies. For the switching assembly corresponding to filter 6, cam 15 rotates 90 degrees counterclockwise, roller 16 moves from the outermost end of semi-convex annular groove 1512 to one end of semi-circular annular groove 1511, rack 19 moves in the opposite direction, and gear 2 13, shaft 2 12 and filter 6 rotate 180 degrees in reverse. At the same time, in the switching assembly corresponding to baffle 5, cam 15 rotates 90 degrees counterclockwise, roller 16 moves in semi-circular annular groove 1511, and baffle 5 remains vertical. During this process, fan 4 remains running.

[0037] S5. The drive assembly continues to drive the two sets of switching assemblies. For the switching assembly corresponding to filter 6, the cam 15 rotates 90 degrees counterclockwise, and the roller 16 moves within the semi-circular groove 1511, keeping filter 6 vertical. Simultaneously, in the switching assembly corresponding to baffle 5, the cam 15 rotates 90 degrees counterclockwise, and the roller 16 moves from one end of the semi-circular groove 1511 to the outermost end of the semi-convex groove 1512. The rack 19 moves to the left, driving gear 11 to rotate clockwise. Gear 11 drives baffle 5 to rotate 90 degrees clockwise through shaft 10, changing baffle 5 from a vertical state to a horizontal state, separating it above the dust discharge end of connecting pipe 2, thus connecting the air inlet and outlet of connecting pipe 2. At this point, the switch from backflushing cleaning state to filtration ventilation state is completed. During this process, the fan 4 remains running.

[0038] like Figures 1-3 As shown, the drive assembly includes a motor 7 mounted on the outer periphery of the air inlet duct 1, a drive shaft 8 rotatably mounted on the outer shaft bracket of the air inlet duct 1, and two sets of transmission assemblies. Each set of transmission assemblies includes two synchronous pulleys 9 and a synchronous belt meshing with the two synchronous pulleys 9. In one set of transmission assemblies, the two synchronous pulleys 9 are respectively mounted on the drive shaft 8 and a mounting shaft 14, while in the other set of transmission assemblies, the two synchronous pulleys 9 are respectively mounted on the drive shaft and another mounting shaft 14. The motor 7 drives the drive shaft 8 to rotate, and the drive shaft 8 drives the two mounting shafts 14 to rotate synchronously via the synchronous belt transmission. A mounting cover 27 is detachably mounted on the air inlet duct 1 and the connecting pipe 2, for example, by bolts. The mounting cover 27 shields the switching mechanism from the inside for protection, and heat dissipation holes for the motor 7 can be provided on the mounting cover 27.

[0039] This embodiment cleans the filter 6 by backflushing it and automatically collects the blown-off dust. Cleaning can be performed without removing the filter 6, resulting in high cleaning efficiency. The fan 4 does not need to be shut down during the entire process. When switching from the filtration ventilation state to the backflushing cleaning state, first rotate the baffle 5 to its position, that is, rotate the baffle 5 from a horizontal distribution state to a vertical distribution state, from blocking the dust discharge end of the connecting pipe 2 to blocking the right side of the air outlet end; then rotate the filter 6 180 degrees, and use the fan 4 to backflush the filter 6 to blow off the dust, using the baffle 5 for airflow guidance, and collecting the dust through the dust collection assembly. When switching from the backflushing cleaning state to the filtration ventilation state, first reverse the filter 6 180 degrees to reset it, then reverse the baffle 5 90 degrees to reset it, and use the fan 4 to blow air towards the filter 6, filtering the dust through the filter 6 for ventilation in the coal mine.

[0040] Example 2, as Figures 1-6As shown, this embodiment proposes a safety ventilation device for coal mines. Compared to Embodiment 1, in this embodiment, the semi-convex annular groove 1512 includes a toothed groove 15122 located in the middle and two connecting grooves 15121. Each connecting groove 15121 connects one end of the toothed groove 15122 to one end of the adjacent semi-circular annular groove 1511. For the switching component corresponding to the baffle 5, when the cam 15 rotates, it can drive the roller 16 to reciprocate through the toothed groove 15122, thereby causing the baffle 5 to shake during rotation and dislodging dust from its surface. For the switching component corresponding to the filter screen 6, when the cam 15 rotates, it can also drive the roller 16 to reciprocate through the toothed groove 15122, thereby causing the filter screen 6 to shake and further dislodging dust from it. Furthermore, regarding the timing of the filter screen 6's shaking, when the surface of the filter screen 6 that performs the filtering function is tilted towards the lower left, the roller 16 moves within the toothed groove 15122, and the filter screen 6 shakes, making it easier for the fan 4 on the right to blow the dust shaken off the filter screen 6 into the dust collection assembly; when the surface of the filter screen 6 that performs the filtering function is tilted towards the lower right, the roller 16 moves within the connecting groove 15121, and the filter screen 6 does not shake.

[0041] This embodiment utilizes the vibration of baffle 5 and filter screen 6 to further shake off the dust adhering to the surface, which is more conducive to cleaning and collecting the dust on baffle 5 and filter screen 6.

[0042] Example 3, as Figures 1-6 As shown in this embodiment, a safety ventilation device for coal mines is proposed. Compared with Embodiment 1, in this embodiment, the side of the baffle 5 is an arc-shaped air guide surface 51. When the baffle 5 is horizontally distributed, the air guide surface 51 is located at the bottom of the baffle 5. When the baffle 5 is vertically distributed, the air guide surface 51 faces the air inlet end of the connecting pipe 2, making it easier to guide the air blown by the fan 4 through the air guide surface 51 to the dust discharge end of the connecting pipe 2, thereby collecting dust through the dust collection assembly.

[0043] like Figure 5 and Figure 6 As shown, the dust collection assembly includes a filter bag 25 and a screw cylinder 24 disposed at the top of the filter bag 25. The screw cylinder 24 is threadedly connected to the dust discharge end of the connecting pipe 2. The dust discharge end of the connecting pipe 2 is threadedly connected to an anti-detachment sleeve 26 that secures the screw cylinder 24. Specifically, the outer circumference of the dust discharge end of the connecting pipe 2 has radially staggered external threads one and two, with opposite thread directions. External thread one is lower than external thread two. The inner circumference of the screw cylinder 24 is threadedly connected to one of the external threads, and the outer circumference of the screw cylinder 24 has an external thread three that connects with external thread two. The anti-detachment sleeve 26 is threadedly connected to both external threads two and three. That is, when the screw cylinder 24 is screwed onto the external thread one in one direction of rotation, the anti-detachment sleeve 26 is then screwed downwards onto the external thread three on the outer circumference of the screw cylinder 24 in the opposite direction of rotation. The anti-detachment installation of the screw cylinder 24 is achieved by using the threaded connection with opposite directions of rotation.

[0044] like Figure 6 As shown, an installation frame 21 is installed inside the dust discharge end of the connecting pipe 2. A rotating cylinder 22 is rotatably mounted at the bottom of the installation frame 21. Multiple tapping plates 23 for tapping the filter bag 25 are evenly arranged around the circumference of the rotating cylinder 22. The length of the tapping plate 23 is greater than the radius of the screw cylinder 24, and the cross-sectional profile of the tapping plate 23 is arc-shaped. The air blown to the dust discharge end of the connecting pipe 2 will cause the tapping plates 23 to rotate. The multiple tapping plates 23 will alternately tap the filter bag 25, shaking off the dust accumulated on the inner surface of the filter bag 25, ensuring the filtration effect of the filter bag 25 at all points.

[0045] In this embodiment, dust-laden air blown from the connecting pipe 2 is trapped by the filter bag 25, and the air is discharged through the gaps in the filter bag 25. By preventing the screw cylinder 24 from detaching and by tapping the filter bag 25, the dust collection assembly can effectively collect dust.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A safety ventilation device for coal mines, characterized in that, include: The connecting pipe (2) has an air inlet and an air outlet at its two horizontal ends, and a dust discharge end at its bottom. An air inlet pipe (1) is connected to the air inlet end of the connecting pipe (2). Inside, a filter screen (6) and a fan (4) are arranged in sequence along the direction away from the connecting pipe (2). The middle of the side of the filter screen (6) is rotatably installed inside the air inlet pipe (1) via a rotating shaft (12). The air outlet pipe (3) is connected to the air outlet end of the connecting pipe (2); The dust collection component is connected to the dust discharge end of the connecting pipe (2); The baffle (5) is rotatably installed inside the connecting pipe (2) via a rotating shaft (10) at one end; When switching the mechanism is in the filtration ventilation state, the switching mechanism adjusts the filter (6) to the vertical state and adjusts the baffle (5) to the horizontal state. At this time, the air inlet and outlet of the connecting pipe (2) are connected, and the baffle (5) isolates the dust discharge end. When backflushing for cleaning, the switching mechanism adjusts the baffle (5) to the vertical state and rotates the filter (6) 180 degrees. At this time, the air inlet and outlet of the connecting pipe (2) are connected, and the baffle (5) isolates the air discharge end. When switching from the filtration ventilation state to the backflushing for cleaning state, the baffle (5) first rotates counterclockwise from the horizontal state to the vertical state, and then the filter (6) rotates 180 degrees. When switching from the backflushing for cleaning state to the filtration ventilation state, the filter (6) first rotates 180 degrees in the opposite direction, and then the baffle (5) rotates clockwise from the vertical state to the horizontal state. The switching mechanism includes two sets of switching components that are respectively linked to rotating shaft one (10) and rotating shaft two (12), and a drive component that drives the two sets of switching components. The switching components include gears, mounting shafts (14), cams (15), rollers (16), wheel frames (17), slide columns (18), racks (19), and brackets (20). The gears and racks (19) are meshed. The cams (15) are mounted on the mounting shafts (14) and have guide grooves (151). The rollers (16) roll in the guide grooves (151) and are rotatably mounted on the wheel frames (17). The wheel frames (17) and racks (19) are respectively mounted at both ends of the slide columns (18). The slide columns (18) are slidably mounted on the brackets (20). The two cams (15) in the two sets of switching components rotate in the same direction but face opposite directions. The two gears in the two sets of switching components are gears. Gear 1 (11) and Gear 2 (13), Gear 1 (11) is mounted on shaft 1 (10), and Gear 2 (13) is mounted on shaft 2 (12). The gear ratio of Gear 1 (11) and Gear 2 (13) is 2:

1. The guide groove (151) is an annular groove, including a semi-circular annular groove (1511) coaxially distributed with the mounting shaft (14) and a semi-convex annular groove (1512) connected to both ends of the semi-circular annular groove (1511). On the inner side of the semi-convex annular groove (1512) along the contour from one end to the other, the distance from the semi-convex annular groove (1512) to the mounting shaft (14) first increases and then decreases. The semi-convex annular groove (1512) includes a toothed groove (15122) located in the middle and two connecting grooves (15121). Each connecting groove (15121) connects one end of the toothed groove (15122) to one end of the adjacent semi-circular annular groove (1511).

2. The safety ventilation device for coal mines according to claim 1, characterized in that, The side of the baffle (5) is an arc-shaped air guide surface (51).

3. A safety ventilation device for coal mines according to claim 1, characterized in that, The dust collection assembly includes a filter bag (25) and a screw (24) set at the top of the filter bag (25). The screw (24) is threaded to the dust discharge end of the connecting pipe (2). The dust discharge end of the connecting pipe (2) is threaded with an anti-detachment sleeve (26) that secures the screw (24).

4. A safety ventilation device for coal mines according to claim 3, characterized in that, The dust discharge end of the connecting pipe (2) is equipped with an installation frame (21), and a rotating drum (22) is rotatably installed at the bottom of the installation frame (21). Multiple tapping plates (23) for tapping the filter bag (25) are evenly arranged around the circumference of the rotating drum (22).

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