An underground ventilation device for metal mines

Abstract

This invention discloses an underground ventilation device for metal mines, relating to the field of mine safety ventilation technology. It includes an exhaust box body and a cover fixed to the upper end of the exhaust box body. An exhaust mechanism is provided on the lower surface of the exhaust box body. A duct is fixedly connected through the lower surface of the exhaust box body. Multiple branch pipes communicating with the interior are fixedly connected to the upper part of the outer surface of the duct. An exhaust pipe communicating with the interior is fixedly connected to the right side of the upper surface of the cover. A spray mechanism is provided at the middle position of the upper surface of the cover. This design, through the ingenious cooperation between the stirring mechanism and the fixed toothed ring, enables the vertical rod to simultaneously generate uniform revolution around the rotating rod and high-speed rotation around its own axis under the drive of airflow. This drives the dispersing blades on it to perform a compound planetary motion, which can extremely effectively break up and disperse the rising agglomerated airflow and dust clumps, significantly enhancing the wetting and capture efficiency of dust particles and the mass transfer and absorption rate of gaseous pollutants.

Description

Technical Field

[0001] This invention relates to the field of mine safety ventilation technology, and in particular to an underground ventilation device for metal mines. Background Technology

[0002] Existing underground mine ventilation systems typically only have intake and exhaust devices. However, the exhaust gas generated in underground metal mines contains a large amount of metal dust, and direct discharge of such gas would cause serious environmental pollution, which does not meet the requirements of environmental protection departments.

[0003] For example, a search revealed a utility model patent in China with publication number CN219529066U: a ventilation device for underground metal mines, comprising a circulation box, a fixed pipe movably inserted into the top center of the circulation box, a through hole adapted to the fixed pipe on the circulation box, a ventilation box connected to the top of the fixed pipe, a funnel-shaped bottom end of the ventilation box, and two symmetrical support legs connected to the bottom end of the ventilation box, the other end of the support legs connected to the top of the circulation box, a water circulation mechanism on the ventilation box, an air inlet pipe connected to the left end of the ventilation box, an exhaust fan installed on the air inlet pipe, a fixed horizontal plate supported at the bottom end of the exhaust fan, one side of the fixed horizontal plate connected to the outer wall of the ventilation box, and an air outlet pipe connected to the right end of the ventilation box. By setting up a water circulation mechanism, water can be recycled, which is beneficial to improving the utilization rate of water resources.

[0004] However, the existing devices described above still have the following problems in actual use:

[0005] The existing device described above will cause the water sprayed out by the air through the air inlet pipe, as well as the water and dust mixture, to be discharged through the air outlet pipe. As a result, it cannot filter the dust in the air discharged through the air inlet pipe, thus reducing the ventilation effect of the device.

[0006] Chinese patent discloses a ventilation device for underground metal mines (authorization announcement number CN222823273U). This patented technology facilitates the quick replacement of the filter screen by installing a bracket and a first hole. The filter screen filters the air discharged through the exhaust pipe, and the through holes and collection grooves collect the impurities filtered by the filter screen. This allows the device to filter dust in the air discharged through the exhaust pipe, thereby improving the ventilation effect and practicality of the device.

[0007] However, it has certain drawbacks: its purification efficiency needs to be improved. Specifically, the dust-laden airflow in the exhaust duct usually only comes into limited contact with the water mist sprayed directly downwards from the nozzle. This contact method is relatively passive and singular, resulting in insufficient mixing of the gas and liquid phases, and both the contact area and contact time are insufficient. Many fine dust particles fail to be effectively captured by the water mist and pass through with the airflow, ultimately relying on the end filter screen for interception. This not only increases the load on the filter screen, causing it to need frequent cleaning or replacement, but also makes it difficult for the overall dust removal efficiency to meet the stringent requirements of the high-concentration dust environment underground. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides an underground ventilation device for metal mines, solving the problems mentioned in the background section.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: a ventilation device for underground metal mines, comprising: an exhaust box body and a cover fixed to the upper end of the exhaust box body, wherein a drain pipe communicating with the interior is fixed to the lower end of the left side surface of the exhaust box body, and an exhaust mechanism is provided on the lower surface of the exhaust box body.

[0010] A duct is fixedly connected to the lower surface of the exhaust box. Multiple branch pipes connected to the interior are fixedly connected to the upper part of the outer surface of the duct. Multiple air holes are opened on the lower surface of the branch pipes. An exhaust pipe connected to the interior is fixedly connected to the right side of the upper surface of the box cover.

[0011] A spraying mechanism is provided at the middle position of the upper surface of the box cover;

[0012] A filter mechanism is provided at the upper end of the front surface of the box cover;

[0013] The upper surface of the air duct is provided with an agitation mechanism, which includes a rotating rod. A seat bearing is installed on the outside of the rotating rod, and an impeller is fixedly connected to the lower end of the rotating rod. Multiple rotating plates are evenly fixed to the upper surface of the outer surface of the rotating rod, and an agitator is provided at the end of the upper surface of the rotating plate away from the rotating rod.

[0014] As a further technical solution of the present invention, the agitator includes a vertical rod, a gear is fixedly sleeved on the lower outer end of the vertical rod, and a plurality of dispersing blades are fixedly connected to the outer surface of the vertical rod above the gear.

[0015] As a further technical solution of the present invention, the rotating rod movably penetrates the upper surface of the air duct, the seat bearing is fixedly connected to the upper surface of the air duct, the impeller is located inside the air duct, and the vertical rod is rotatably connected to the upper surface of the rotating plate at the end away from the rotating rod.

[0016] As a further technical solution of the present invention, the upper surface of the air duct is provided with a rotating component located outside the rotating rod. The rotating component includes a toothed ring, and a plurality of connecting rods are uniformly fixed to the lower surface of the toothed ring. A connecting plate is fixed to the lower end of the connecting rod.

[0017] As a further technical solution of the present invention, the gear is located inside the gear ring and is meshed with the gear ring, and the end of the connecting plate away from the connecting rod is fixed to the upper surface of the air duct.

[0018] As a further technical solution of the present invention, the exhaust mechanism includes a U-shaped frame, the upper end of which is fixed to the lower surface of the exhaust box, and a fan is fixed to the lower inner surface of the U-shaped frame. A first air duct is fixed to the air inlet end of the fan, and a second air duct is fixed to the air outlet end of the fan. The second air duct is fixed to the lower surface of the air duct and is connected to the interior of the air duct.

[0019] As a further technical solution of the present invention, the spraying mechanism includes a water tray, which is located inside the exhaust box, and a water pipe connected to the inside of the water tray is fixedly connected to the upper surface of the water tray. The water pipe is fixedly connected to the box cover, and a plurality of spray nozzles connected to the inside of the water tray are fixedly connected to the lower surface of the water tray.

[0020] As a further technical solution of the present invention, the filtration mechanism includes a filter plate that movably penetrates the front surface of the exhaust box body and is located inside the exhaust box body. The filter plate is located between the water pan and the agitation mechanism. A baffle is fixedly connected to the front end of the filter plate. The rear surface of the baffle is attached to the front surface of the exhaust box body. A support rod is installed on the upper side of the baffle. The rear end of the support rod is fixedly connected to the front surface of the exhaust box body. A support block is rotatably connected to the outside of the support rod. A support pad is fixedly connected to the rear surface of the support block. The rear surface of the support pad is attached to the front surface of the baffle.

[0021] As a further technical solution of the present invention, the branch pipe is located inside the exhaust box body.

[0022] This invention provides an underground ventilation device for metal mines, which has the following advantages compared with the prior art:

[0023] This design presents a ventilation device for underground metal mines. Through the ingenious cooperation between the stirring mechanism and the fixed toothed ring, the vertical rod, driven by airflow, simultaneously generates a uniform revolution around the rotating rod and a high-speed rotation around its own axis. This drives the dispersing blades on it to perform a compound planetary motion, forming a high-intensity, highly turbulent dynamic stirring field below the spray area. This effectively breaks down and disperses the rising agglomerated airflow and dust clumps, and further shears the spray mist into finer droplets. This significantly increases the contact surface area and mixing uniformity of the gas, liquid, and solid phases, and significantly enhances the wetting and capture efficiency of dust particles and the mass transfer and absorption rate of gaseous pollutants. This process is entirely driven by airflow kinetic energy, requiring no additional power consumption, thus achieving energy saving and high efficiency. At the same time, the airflow, after multi-stage purification, is further filtered by filter plates, ultimately resulting in a comprehensive improvement in purification efficiency, energy consumption control, and adaptability of the device. It effectively solves the technical problems of high ventilation resistance, high pollutant concentration, and poor purification effect of traditional equipment in local areas of underground metal mines. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a ventilation device for underground metal mines.

[0025] Figure 2 A schematic diagram of the structure of an air vent in an underground ventilation device for a metal mine.

[0026] Figure 3 This is a schematic diagram of the spray mechanism in an underground ventilation system for a metal mine.

[0027] Figure 4 This is a schematic diagram of the filtration mechanism in an underground ventilation system for a metal mine.

[0028] Figure 5 This is a partial structural diagram of a ventilation device for underground metal mines.

[0029] Figure 6 This is a schematic diagram of the agitation mechanism in an underground ventilation system for a metal mine.

[0030] Figure 7 This is a schematic diagram of the structure of an agitator in an underground ventilation system for a metal mine.

[0031] Figure 8 This is a schematic diagram of the structure of a rotating component in an underground ventilation device for metal mines.

[0032] In the diagram: 1. Exhaust box body; 2. Box cover; 3. Drain pipe; 4. Exhaust mechanism; 5. U-shaped frame; 6. Fan; 7. Air duct one; 8. Air duct two; 9. Air tube; 10. Branch pipe; 11. Air hole; 12. Exhaust pipe; 13. Spraying mechanism; 14. Water tray; 15. Water pipe; 16. Spray head; 17. Filtering mechanism; 18. Filter plate; 19. Baffle; 20. Support rod; 21. Support block; 22. Support pad; 23. Agitator; 24. Rotating rod; 25. Seat bearing; 26. Impeller; 27. Rotating plate; 28. Agitator; 29. ​​Vertical rod; 30. Gear; 31. Dispersing blade; 32. Rotated part; 33. Gear ring; 34. Connecting rod; 35. Connecting plate. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Please refer to this carefully. Figure 1 and Figure 2 As shown, the present invention provides a technical solution for an underground ventilation device in a metal mine: including: an exhaust box body 1 and a box cover 2 fixed to the upper end of the exhaust box body 1, the two being fixed together by bolts;

[0035] The exhaust box body 1 and the cover 2 are preferably made of stainless steel or engineering plastics to adapt to the harsh environment of dampness and strong corrosion underground. Specifically, when stainless steel is selected, 304 or 316L stainless steel is preferred, and when engineering plastics are selected, polypropylene or glass fiber reinforced nylon can be used.

[0036] In this embodiment, a drain pipe 3 connected to the lower left side surface of the exhaust box 1 is fixedly connected to the lower end of the exhaust box body 1. The drain pipe 3 is used to discharge the wastewater after spraying. The drain pipe 3 can be connected to a valve or hose to lead the wastewater to the underground drainage system. The lower inner surface of the exhaust box body 1 can be designed as a sloping structure inclined towards the inlet of the drain pipe 3 to guide all spraying wastewater and settled sludge to flow smoothly to the drain outlet, so as to achieve no liquid accumulation at the bottom of the box, which is convenient for cleaning and reduces corrosion.

[0037] Furthermore, a float-type liquid level switch can be installed on the lower part of the inner wall of the exhaust box 1. When the drain pipe 3 is accidentally blocked, causing the water in the box to exceed the safe water level, the switch can trigger an alarm or automatically cut off the power to the fan 6 to prevent the water level from being too high and submerging the fan outlet or electrical components.

[0038] Please refer to Figures 1-2 for details. The lower surface of the exhaust box 1 is equipped with an exhaust mechanism 4. The exhaust mechanism 4 includes a U-shaped frame 5 with its opening facing upwards and its two arms distributed on the left and right sides. The upper end of the U-shaped frame 5 is fixed to the lower surface of the exhaust box 1, and a fan 6 is fixed to the inner lower surface of the U-shaped frame 5. The fan 6 is a centrifugal fan with sufficient suction force. It is a commonly used conveying equipment in industry and belongs to the category of industrial-grade centrifugal fans (refer to GB / T 3235-2008 "Technical Conditions for Centrifugal Fans"). It uses a mechanical seal or labyrinth seal between the motor and the impeller cavity to ensure that foreign objects cannot enter the motor cavity in reverse when rotating at high speed. Therefore, no damage or other problems will occur when sucking up foreign objects.

[0039] In this embodiment, the air inlet end of the blower 6 is fixedly connected to a first air duct 7, which is a flexible hose and can be installed in the location of the metal mine where ventilation is required; the air outlet end of the blower 6 is fixedly connected to a second air duct 8, and the lower surface of the exhaust box 1 is fixedly connected to a duct 9. The second air duct 8 is fixedly connected to the lower surface of the duct 9 and is connected to the interior of the duct 9. At the upper part of the outer surface of the duct 9, multiple branch pipes 10 are fixedly connected to its interior. The branch pipes 10 are located inside the exhaust box 1, and multiple air holes 11 are opened on the lower surface of the branch pipes 10. The multiple branch pipes 10 are evenly distributed radially around the duct 9. The air holes 11 on the multiple branch pipes 10 allow the agglomerated airflow to be discharged in the form of multiple small airflows, thereby increasing the contact area with the subsequent spraying liquid and improving the dust removal efficiency in the airflow.

[0040] The diameter and number of air holes 11 are designed by calculation to ensure that the air outlet speed can effectively support the droplets and enhance turbulence, but will not directly penetrate the liquid curtain due to excessive speed, causing a "short circuit".

[0041] An exhaust pipe 12, which connects to the inside of the box, is fixedly connected to the right side of the upper surface of the box cover 2.

[0042] The exhaust duct 12 is used to discharge the treated airflow.

[0043] Please refer to this carefully. Figure 1-3 As shown, a spraying mechanism 13 is provided at the middle position of the upper surface of the box cover 2. The spraying mechanism 13 includes a water tray 14, which is located inside the exhaust box 1. A water pipe 15 is fixedly connected to the upper surface of the water tray 14 and is connected to the inside of it. The water pipe 15 passes through and is fixedly connected to the box cover 2.

[0044] In this embodiment, the water pipe 15 is connected to a dedicated explosion-proof water pump in the well via a pipeline, and its water source can be the underground dust suppression water supply system; in addition to clean water, the spraying liquid can be supplemented with surfactants as needed to reduce the surface tension of the water and enhance the wetting ability of hydrophobic dust; or alkaline substances can be added to neutralize the acidic gas generated by the explosion.

[0045] Multiple nozzles 16 connected to the interior of the water tray 14 are fixed to the lower surface of the water tray 14.

[0046] The nozzle 16 is preferably a spiral atomizing nozzle or a hollow cone nozzle, which can produce a large amount of fine water mist.

[0047] Please refer to this carefully. Figure 1 , Figure 3 and Figure 4 As shown, a filter mechanism 17 is provided at the upper end of the front surface of the box cover 2. The filter mechanism 17 includes a filter plate 18, which movably penetrates the front surface of the exhaust box 1 and is located inside the exhaust box 1. The filter plate 18 is located between the water pan 14 and the stirring mechanism 23.

[0048] Filter plate 18 is used to filter dust in the airflow;

[0049] The filter plate 18 is preferably a composite filter unit, which includes at least two layers: one layer is a stainless steel wire mesh for intercepting larger particles; the other layer is a porous ceramic or activated carbon fiber layer impregnated with an active oxidant or catalyst for further adsorption and decomposition of trace amounts of toxic gases.

[0050] The rear surface and left and right side surfaces of the filter plate 18 are respectively attached to the inner rear surface and left and right side surfaces of the exhaust box 1. It is preferable to set a U-shaped sealing strip or wear-resistant rubber sheet on the contact surface to ensure that the airflow cannot be short-circuited when the filter plate 18 is inserted into the working position and must pass through the filter plate 18.

[0051] A baffle 19 is fixed to the front end of the filter plate 18, and the rear surface of the baffle 19 is attached to the front surface of the exhaust box 1.

[0052] The filter plate 18 can be directly pulled out through the baffle 19, making it easy to clean and maintain;

[0053] A support rod 20 is installed on the upper side of the baffle 19. The rear end of the support rod 20 is fixed to the front surface of the exhaust box 1. A support block 21 is rotatably connected to the outside of the support rod 20. A support pad 22 is fixed to the rear surface of the support block 21. The rear surface of the support pad 22 is attached to the front surface of the baffle 19.

[0054] The support pad 22 is a component made of an elastic material, preferably rubber;

[0055] When the support pad 22 is located in front of the baffle 19, it presses the baffle 19 with elastic force to fix the filter plate 18. After rotating the support block 21 to offset the baffle 19, the filter plate 18 can be pulled forward.

[0056] Please refer to this carefully. Figure 5-7As shown, an agitation mechanism 23 is provided on the upper surface of the air duct 9. The agitation mechanism 23 includes a rotating rod 24, which movably passes through the upper surface of the air duct 9. A seat bearing 25 is installed on the outside of the rotating rod 24 and is fixed to the upper surface of the air duct 9.

[0057] The pedestal bearing 25 includes a bearing housing and a bearing fixed inside the bearing housing. The bearing includes an outer bearing ring and an inner bearing ring that rotates inside the outer bearing ring. The outer bearing ring is fixed in the bearing housing, and the bearing housing is fixed to the upper air duct 9. The rotating rod 24 is fixed in the inner bearing ring. Therefore, the pedestal bearing 25 and the rotating rod 24 are in a state of mutual rotation.

[0058] An impeller 26 is fixedly connected to the lower end of the rotating rod 24, and the impeller 26 is located inside the air duct 9;

[0059] The structure of impeller 26 is similar to that of a centrifugal fan impeller. Impeller 26, which is impacted by airflow, drives rotor 24 to rotate.

[0060] Multiple rotating plates 27 are uniformly fixed to the upper end of the outer surface of the rotating rod 24. An agitator 28 is provided at the end of the upper surface of the rotating plate 27 away from the rotating rod 24. The agitator 28 includes a vertical rod 29, which is rotatably connected to the end of the upper surface of the rotating plate 27 away from the rotating rod 24. The two can be rotatably connected by a bearing.

[0061] A gear 30 is fixedly sleeved on the lower outer end of the vertical rod 29, and multiple dispersing blades 31 are fixedly connected to the outer surface of the vertical rod 29 above the gear 30.

[0062] Multiple vertical rods 29 revolve around the rotating rod 24, and the airflow is dispersed by the dispersing blades 31.

[0063] like Figure 5 , Figure 7 and Figure 8 As shown, the upper surface of the air duct 9 is provided with a rotating part 32 located outside the rotating rod 24. The rotating part 32 includes a gear ring 33, a gear 30 located inside the gear ring 33 and meshing with the gear ring 33. A plurality of connecting rods 34 are uniformly fixed to the lower surface of the gear ring 33. A connecting plate 35 is fixed to the lower end of the connecting rod 34. The end of the connecting plate 35 away from the connecting rod 34 is fixed to the upper surface of the air duct 9.

[0064] When the vertical rod 29 revolves, the gear 30 drives the vertical rod 29 to rotate via the gear ring 33, which in turn drives the dispersing blade 31 to rotate, further improving the dust removal efficiency in the airflow.

[0065] The working principle of this invention is as follows: the polluted air in the well is drawn in by the centrifugal fan 6 and enters the system through the air duct 7, which serves as the suction hose. After being pressurized by the centrifugal fan 6, it is transported through the air duct 8 to the air duct 9 fixed at the bottom of the exhaust box 1. The airflow is then divided into multiple branch pipes 10 arranged around the air duct 9 and discharged evenly upward in the form of multiple fine airflows through multiple air holes 11 opened on the lower surface of the branch pipes 10.

[0066] Meanwhile, the spraying mechanism 13 introduces spray liquid from an external water source to the water pan 14 through the water pipe 15, and sprays fine water mist downwards from multiple nozzles 16 at its lower part; the upward airflow first impacts the impeller 26 of the stirring mechanism 23, driving the rotating rod 24 to rotate under the support of the seat bearing 25. The rotating rod 24 drives multiple rotating plates 27 on it and the stirring element 28 installed at the end of the rotating plate 27 to revolve around the axis of the rotating rod 24. The gear 30 fixed at the lower end of the vertical rod 29 meshes with the gear ring 33 fixedly installed above the air duct 9, forcing the vertical rod 29 to generate high-speed rotation while revolving, thereby driving multiple dispersing blades 31 on the vertical rod 29 to perform planetary compound motion, which strongly disperses and mixes the rising airflow and spray liquid mist, forming a highly turbulent enhanced purification zone;

[0067] The airflow, after being thoroughly washed and mixed, continues to rise and passes through the filter plate 18 of the filtration mechanism 17 for interception and fine filtration. Finally, the purified clean air is discharged through the exhaust pipe 12 at the top of the box cover 2, while the wastewater generated by the spraying is collected at the bottom of the exhaust box 1 and discharged through the drain pipe 3.

[0068] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A ventilation device for underground metal mines, characterized in that, include: The exhaust box body (1) and the box cover (2) fixed to the upper end of the exhaust box body (1) are provided with a drain pipe (3) connected to the lower end of the left side surface of the exhaust box body (1), and a ventilation mechanism (4) is provided on the lower surface of the exhaust box body (1). The lower surface of the exhaust box (1) is connected to a duct (9), and a number of branch pipes (10) connected to the inside are fixed at the upper end of the outer surface of the duct (9). A number of air holes (11) are opened on the lower surface of the branch pipes (10), and an exhaust pipe (12) connected to the inside is fixed on the right side of the upper surface of the box cover (2). A spraying mechanism (13) is provided at the middle position of the upper surface of the box cover (2); A filter mechanism (17) is provided at the upper end of the front surface of the box cover (2); The upper surface of the air duct (9) is provided with an agitation mechanism (23). The agitation mechanism (23) includes a rotating rod (24). A seat bearing (25) is installed on the outside of the rotating rod (24), and an impeller (26) is fixedly connected to the lower end of the rotating rod (24). Multiple rotating plates (27) are evenly fixed to the upper end of the outer surface of the rotating rod (24). An agitator (28) is provided at the end of the upper surface of the rotating plate (27) away from the rotating rod (24).

2. The underground ventilation device for metal mines according to claim 1, characterized in that, The agitator (28) includes a vertical rod (29), a gear (30) is fixedly sleeved on the lower outer end of the vertical rod (29), and a plurality of dispersing blades (31) are fixedly connected to the outer surface of the vertical rod (29) on the upper side of the gear (30).

3. The underground ventilation device for metal mines according to claim 2, characterized in that, The rotating rod (24) extends through the upper surface of the air duct (9), the seat bearing (25) is fixed to the upper surface of the air duct (9), the impeller (26) is located inside the air duct (9), and the vertical rod (29) is rotatably connected to the upper surface of the rotating plate (27) at the end away from the rotating rod (24).

4. A ventilation device for underground metal mines according to claim 2, characterized in that, The upper surface of the air duct (9) is provided with a rotating part (32) located outside the rotating rod (24). The rotating part (32) includes a toothed ring (33). Multiple connecting rods (34) are uniformly fixed to the lower surface of the toothed ring (33). A connecting plate (35) is fixed to the lower end of the connecting rod (34).

5. A ventilation device for underground metal mines according to claim 4, characterized in that, The gear (30) is located inside the gear ring (33) and is meshed with the gear ring (33). The end of the connecting plate (35) away from the connecting rod (34) is fixed to the upper surface of the air duct (9).

6. A ventilation device for underground metal mines according to claim 1, characterized in that, The exhaust mechanism (4) includes a U-shaped frame (5), the upper end of which is fixed to the lower surface of the exhaust box (1), and a fan (6) is fixed to the lower inner surface of the U-shaped frame (5). A first air duct (7) is fixed to the air inlet end of the fan (6), and a second air duct (8) is fixed to the air outlet end of the fan (6). The second air duct (8) is fixed to the lower surface of the air duct (9), and the second air duct (8) is connected to the interior of the air duct (9).

7. A ventilation device for underground metal mines according to claim 1, characterized in that, The spraying mechanism (13) includes a water tray (14), which is located inside the exhaust box (1). A water pipe (15) is fixedly connected to the upper surface of the water tray (14) and is connected to the box cover (2). A plurality of nozzles (16) are fixedly connected to the lower surface of the water tray (14).

8. A ventilation device for underground metal mines according to claim 7, characterized in that, The filtration mechanism (17) includes a filter plate (18), which is movably connected through the front surface of the exhaust box body (1) and is located inside the exhaust box body (1). The filter plate (18) is located between the water pan (14) and the stirring mechanism (23). A baffle (19) is fixedly connected to the front end of the filter plate (18). The rear surface of the baffle (19) is attached to the front surface of the exhaust box body (1). A support rod (20) is installed on the upper side of the baffle (19). The rear end of the support rod (20) is fixedly connected to the front surface of the exhaust box body (1). A support block (21) is rotatably connected to the outside of the support rod (20). A support pad (22) is fixedly connected to the rear surface of the support block (21). The rear surface of the support pad (22) is attached to the front surface of the baffle (19).

9. A ventilation device for underground metal mines according to claim 1, characterized in that, The branch pipe (10) is located inside the exhaust box body (1).

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