Multi-stage dust removal device for mining area

Abstract

The mining area multi-stage dust removal device comprises a coarse dust filtering chamber and a tiny dust filtering chamber, the coarse dust filtering chamber comprises a box body, a first air inlet is formed in the lower portion of the side wall of the box body and connected with a suction fan, a first air outlet is formed in the upper portion of the box body, and a second filtering net is arranged in the middle of the interior of the box body; the tiny dust filtering chamber comprises a water washing box, a filler layer is arranged in the middle of the water washing box, an ultrasonic generator and a second air inlet are arranged on the lower portion of the side wall of the water washing box, and an air guide pipe is connected between the first air outlet and the second air inlet; a second air outlet and a water inlet are formed in the top of the washing box, a second water guide pipe is connected to the bottom of the washing box and connected with a water circulation filtering mechanism, and the water inlet is communicated with the water circulation filtering mechanism. Dust with larger particle size is removed through the second filter screen, and dust-containing air is introduced into water to remove dust with smaller particle size, so that a better dust removal effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology, and in particular to a multi-stage dust removal device for mining areas. Background Technology

[0002] Dust is one of the biggest hazards in mining operations. Large amounts of dust of varying particle sizes are generated during blasting, loading and unloading, transportation, crushing, and grinding. Prolonged exposure to airborne dust can cause significant harm to workers. Existing methods for dust removal in mines include cyclone dust collectors, bag filters, and electrostatic precipitators. However, a single dust removal method cannot achieve optimal results. Cyclone dust collectors can only remove larger particles, bag filters require specific temperature and humidity control of the dust-laden gas, and electrostatic precipitators are sensitive to the resistivity of the dust. All these methods are only effective for dust with specific characteristics. Therefore, combining multiple dust removal methods is necessary to achieve better dust control results. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a multi-stage dust removal device for mining areas. Dust-laden air is initially filtered through a filter screen to remove larger dust particles. The dust-laden air with a lower wind speed is then introduced into water. Through the combined use of a perforated plate, a packing layer, and an ultrasonic generator, the fine dust particles achieve a good dust removal effect in the water, and finally, the purified air is discharged.

[0004] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0005] A multi-stage dust removal device for mining areas includes a coarse dust filtration chamber and a fine dust filtration chamber. The coarse dust filtration chamber includes a housing with a first air inlet located on the lower part of the side wall of the housing. The first air inlet is connected to a suction fan. A first air outlet is located on the upper part of the housing. A second filter screen is located in the middle of the housing. The first air inlet and the first air outlet are located on the upper and lower sides of the second filter screen, respectively. The fine dust filtration chamber includes a washing tank with a packing layer located in the middle of the washing tank. An ultrasonic generator and a second air inlet are located on the lower part of the side wall of the washing tank. A duct connects the first air outlet and the second air inlet. A second air outlet and a water inlet are located on the top of the washing tank. A second water guide pipe is connected to the bottom of the washing tank. The second water guide pipe is connected to a water circulation filtration mechanism. The water inlet is connected to the water circulation filtration mechanism.

[0006] Furthermore, a perforated plate is provided between the second air inlet and the packing layer. The edge of the perforated plate is fixedly connected to the inner wall of the washing tank, and the perforated plate is inclined upward along the direction away from the second air inlet.

[0007] Furthermore, the water circulation mechanism includes a filter box, inside which is a first filter screen that divides the filter box into left and right parts. The left side of the filter box is connected to a second water guide pipe, and the right side of the filter box is connected to the water inlet via a first water guide pipe. A water pump is installed on the first water guide pipe.

[0008] Furthermore, a first flow control valve is installed on the second water pipe, and a second flow control valve is installed on the first water pipe.

[0009] Furthermore, the second filter screen is circular, and a frame is provided on the outer edge of the second filter screen. The frame is fixedly connected to the inner wall of the box. A support plate is provided along the diameter direction of the second filter screen. A dust removal mechanism is connected to the lower side of the support plate. The dust removal mechanism includes a rotating shaft, which is located at the center of the support plate and is rotatably connected to the support plate. Two sets of fan blades and two sets of scrapers are fixedly connected to the rotating shaft. The two sets of fan blades and scrapers are arranged in a centrally symmetrical manner. The length of the scraper is greater than or equal to the radius of the second filter screen. A collection trough with a U-shaped cross-section is provided below the scraper. The collection trough is fixedly connected to the rotating shaft. A movable plate is provided on the side of the collection trough away from the rotating shaft.

[0010] Furthermore, the bottom of the housing is equipped with an air guide plate to direct the airflow, and the air intake end of the suction fan is connected to a dust collection hood.

[0011] Furthermore, an annular inner wall is provided below the second filter screen, and a dust collection box is provided inside the annular inner wall. The dust collection box is provided with a dust collection port. A movable plate is rotatably connected to one side wall of the collection trough. The opening direction of the movable plate is the same as the rotation direction of the rotating shaft. A sleeve is fixedly connected to the other side wall of the collection trough. The sleeve is located near the movable plate. A spring is fixedly connected inside the sleeve. The other end of the spring is fixedly connected to a sliding rod. The sliding rod is inside the sleeve and slidably connected to the sleeve. The dust collection port is larger than the cross-section of the collection trough. The length of the collection trough is the same as the inner diameter of the inner wall. A dust discharge valve is provided on the outside of the box at a position relative to the dust collection box.

[0012] Furthermore, the bottom plate of the collection tank is tilted downwards at a certain angle in the direction away from the axis of rotation.

[0013] Furthermore, the interior of the dust collection box is funnel-shaped.

[0014] The beneficial effects of this invention are as follows: the dust-laden air first passes through the second filter to remove larger dust particles, and the air velocity of the filtered dust-laden air decreases. During the rising process of the air bubbles in the water washing tank, the tiny dust particles in the bubbles continuously diffuse into the water due to inertial motion and Brownian motion. Under the action of the ultrasonic generator, the dust-laden bubbles burst, accelerating the entry of dust into the water. When the dust-laden bubbles pass through the packing layer, the tortuous path increases the time the bubbles spend in the water, further improving the dust removal effect.

[0015] Under the action of the ultrasonic generator, the dust adhering to the packing layer is easy to fall off and does not easily adhere to the inner wall of the washing tank. Under the action of the water circulation filtration mechanism, the purified water enters from above the packing layer and the downward flowing water washes the packing layer, maintaining the dust removal effect of the packing layer. All the dust-laden water flows downward into the water circulation filtration mechanism, keeping the water in the washing tank clean and the packing layer clean, so that the washing tank always maintains a stable dust removal effect.

[0016] A dust removal mechanism is installed below the second filter screen in the coarse dust filter chamber. Under the action of the airflow entering through the first air inlet, it automatically rotates and scrapes away the dust adhering to the second filter screen, preventing the second filter screen from becoming clogged and ensuring that the second filter screen maintains a stable dust removal effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a multi-stage dust removal device for mining areas according to the present invention;

[0018] Figure 2 This is a schematic diagram of the second filter screen of a multi-stage dust removal device for mining areas according to the present invention;

[0019] Figure 3 This is a schematic diagram of the dust removal mechanism of a multi-stage dust removal device for mining areas according to the present invention;

[0020] Figure 4 This is a schematic diagram of a collection tank for a multi-stage dust removal device in a mining area according to the present invention;

[0021] Figure 5 This is an enlarged view of area A of a multi-stage dust removal device for mining areas according to the present invention;

[0022] Figure 6 This is a schematic diagram of the internal structure of a multi-stage dust removal device for mining areas according to the present invention.

[0023] Reference numerals: 1. Coarse dust filter chamber; 2. Fine dust filter chamber; 3. Housing; 4. Dust hood; 5. Fan; 6. Air guide plate; 7. Inner wall; 8. Dust collection box; 9. Dust outlet valve; 10. Shaft; 11. Fan blade; 12. Dust cleaning mechanism; 13. Air duct; 14. Washing box; 15. Filter box; 16. Packing layer; 17. Perforated plate; 18. Ultrasonic generator; 19. First flow control valve; 20. ... 21. Flow control valve; 22. First filter screen; 23. Water pump; 24. Frame; 25. Support plate; 26. Scraper; 27. Collection trough; 28. Movable plate; 29. ​​Sleeve; 30. Slide rod; 31. Dust collection port; 32. Second air outlet; 33. Water inlet; 34. First water guide pipe; 35. Second water guide pipe; 36. First air inlet; 37. First air outlet; 38. Second air inlet. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0025] Combined with reference to the appendix Figures 1 to 6This invention provides a multi-stage dust removal device for mining areas, including a coarse dust filtration chamber 1 and a fine dust filtration chamber 2. The coarse dust filtration chamber 1 includes a housing 3, with a first air inlet 36 located on the lower part of the side wall of the housing 3. The first air inlet 36 is connected to a suction fan 5. A first air outlet 37 is located on the upper part of the housing 3. A second filter screen 31 is located in the middle of the housing 3. The first air inlet 36 and the first air outlet 37 are located on the upper and lower sides of the second filter screen 31, respectively. The fine dust filtration chamber 2 includes water... The washing tank 14 has a packing layer 16 in the middle, an ultrasonic generator 18 and a second air inlet 38 on the lower side wall of the washing tank 14, a duct 13 connecting the first air outlet 37 and the second air inlet 38, a second air outlet 32 ​​and a water inlet 33 on the top of the washing tank 14, a second water guide pipe 35 connected to the bottom of the washing tank 14, a water circulation filter mechanism connected to the second water guide pipe 35, and the water inlet 33 connected to the water circulation filter mechanism. In operation, dust-laden air enters the housing 3 via the suction fan 5. The air flows upwards, passing through the second filter 31 to remove larger dust particles. The decelerated air then enters the water washing tank 14 through the duct 13. In the water washing tank 14, the water level is higher than the packing layer 16. The dust-laden air transforms into dust-laden bubbles that rise upwards. During this process, smaller dust particles within the bubbles diffuse into the water due to inertia and Brownian motion, achieving dust removal. Simultaneously, the ultrasonic waves generated by the ultrasonic generator 18 create cavitation in the water, causing the dust-laden bubbles to break down into smaller bubbles, increasing the contact area and accelerating the diffusion of dust particles into the water. The dust-laden bubbles continue to rise, passing through the packing layer 16. The packing layer 16 is composed of various shapes made of materials such as ceramics and plastics. The tortuous movement path of the dust-laden bubbles within the packing layer 16 prolongs their time in the water, and the packing layer 16 also has a certain adsorption effect on dust, further improving the dust removal effect and purification. The air is discharged from the second air outlet 32. At the same time, the bottom of the water washing tank 14 is connected to the second water guide pipe 35, which is connected to the water circulation filtration mechanism. The purified water enters from the water inlet 33 at the top of the water washing tank 14, so that the water in the water washing tank 14 circulates from top to bottom. During this process, under the action of ultrasound, the dust adhering to the packing layer 16 falls into the water. Under the action of water circulation, it enters the water below from the packing layer 16. The dust-laden water flows into the water circulation filtration mechanism below. During operation, the dust concentration in the water in the water washing tank 14 is kept at a low concentration under the action of the water circulation filtration mechanism, which helps the dust in the dust-laden bubbles to diffuse into the water and maintain the dust removal effect. During the water circulation from top to bottom, the dust adhering to the packing layer 16 is automatically cleaned, keeping the packing layer 16 clean and ensuring the dust removal effect of the packing layer 16. No manual cleaning is required, so the device can ensure a good dust removal effect.

[0026] Preferably, a perforated plate 17 is provided between the second air inlet 38 and the packing layer 16. The edge of the perforated plate 17 is fixedly connected to the inner wall of the washing tank 14, and the perforated plate 17 is inclined upwards in the direction away from the second air inlet 38. The addition of the perforated plate 17 helps the dust-laden bubbles to transform from large bubbles into small bubbles, increases the surface area of ​​dust in contact with water, and helps the dust diffuse into the water. At the same time, the perforated plate 17 is inclined, and the inclination angle is preferably between 15° and 45°. The large bubbles below the perforated plate 17 move at a moderate speed along the lower surface of the perforated plate 17, and the dust-laden bubbles move along the lower surface of the perforated plate 17, so that the smaller dust-laden bubbles are distributed over a wider range. All the dust-laden bubbles come into contact with water with a low dust concentration, accelerating the entry of dust in the bubbles into the water, thereby improving the dust removal effect.

[0027] Preferably, the water circulation mechanism includes a filter box 15, inside which a first filter screen 21 is provided. The first filter screen 21 divides the filter box 15 into left and right parts. The left side of the filter box 15 is connected to a second water guide pipe 35, and the right side of the filter box 15 is connected to a first water guide pipe 34 between it and the water inlet 33. A water pump 22 is installed on the first water guide pipe 34. Dust-laden water enters the left side of the filter box 15, where dust is intercepted by the first filter screen 21. Clean water enters the right side of the filter box 15, and under the action of the water pump 22, the purified water enters the upper part of the water washing tank 14 from the water inlet 33, thereby achieving water filtration and recycling. If a spray method is used for dust removal, the water is generally filtered and recycled. To avoid clogging of the spray nozzle, the water filtration requirements are high. However, by directly introducing dust-laden air into the water, the water filtration and purification requirements are reduced, effectively lowering the cost of the first filter screen 21.

[0028] Preferably, a first flow control valve 19 is installed on the second water guide pipe 35, and a second flow control valve 20 is installed on the first water guide pipe 34. By controlling the first flow control valve 19 and the second flow control valve 20, the outflow velocity of the dust-laden water in the washing tank 14 is consistent with the inflow velocity of the water in the inlet 33, so that the liquid level is stably maintained above the packing layer, ensuring the dust removal effect of the washing tank 14. When it is necessary to improve the dust removal effect of the entire washing tank 14, the flow velocity in the first flow control valve 19 and the second flow control valve 20 is increased at the same time, increasing the countercurrent contact speed between the water flow and the dust-laden air bubbles, improving the dust removal effect, and also helping the dust-laden water in the washing tank 14 to circulate more quickly, thereby maintaining the dust removal effect. When the dust removal pressure is low, the flow velocity in the first flow control valve 19 and the second flow control valve 20 can be reduced, which can reduce the water circulation pressure and also reduce costs.

[0029] Preferably, the second filter screen 31 is circular, and a frame 23 is provided on the outer edge of the second filter screen 31. The frame 23 is fixedly connected to the inner wall of the housing 3. A support plate 24 is provided along the diameter direction of the second filter screen 31. A dust removal mechanism 12 is connected to the lower side of the support plate 24. The dust removal mechanism 12 includes a rotating shaft 10. The rotating shaft 10 is located at the center of the support plate 24 and is rotatably connected to the support plate 24. Two sets of fan blades 11 and two sets of scrapers 25 are fixedly connected to the rotating shaft 10. The two sets of fan blades 11 and scrapers 25 are arranged in a centrally symmetrical manner. The length of the scraper 25 is greater than or equal to the radius of the second filter screen 31. A collection groove 26 with a U-shaped cross-section is provided below the scraper 25. The collection groove 26 is fixedly connected to the rotating shaft 10. A movable plate 27 is provided on the side of the collection groove 26 away from the rotating shaft 10. The support plate 24 is fixedly connected to the inner wall of the housing 3, and the rotating shaft 10 is rotatably connected to the support plate 24. Two sets of fan blades 11 and two sets of scrapers 25 are fixedly connected to the rotating shaft 10. The upward airflow acts on the two sets of fan blades 11, causing the rotating shaft 10 and the fan blades 11 to rotate, which in turn drives the two sets of scrapers 25 to rotate. The scrapers 25 scrape off the dust adhering to the lower surface of the second filter screen 31. The scraped dust enters the collection tank 26 for collection under the action of gravity. The scrapers 25 are made of rubber or silicone to ensure flexibility. When removing dust from the second filter screen 31, the dust is removed without damaging it. The side plates of the collection tank 26 are close to the second filter screen 31, so that the scraped dust enters the collection tank 26 and is not re-raised into the air. The rotating fan blades 11 disturb the airflow, and the turbulent airflow can improve the dust interception ability of the second filter screen 31. The entire dust removal mechanism 12 automatically cleans the dust to avoid clogging as the dust removal device operates, keeping the second filter screen 31 clean and ensuring that the second filter screen 31 always maintains a good dust removal effect.

[0030] Preferably, the bottom of the housing 3 is provided with an air guide plate 6 for guiding the airflow direction, and the air inlet end of the suction fan 5 is connected to a dust suction hood 4. The dust suction hood 4 improves the device's ability to extract dust-laden air, and the air guide plate 6 redirects the dust-laden gas entering the housing 3, keeping the airflow speed at a high level, which helps the dust removal mechanism to operate.

[0031] Preferably, an annular inner wall 7 is provided below the second filter screen 31, and a dust collection box 8 is provided inside the annular inner wall 7. A dust collection port 30 is provided on the dust collection box 8. A movable plate 27 is rotatably connected to one side wall of the collection trough 26. The opening direction of the movable plate 27 is consistent with the rotation direction of the rotating shaft 10. A sleeve 28 is fixedly connected to the other side wall of the collection trough 26. The sleeve 28 is provided near the movable plate 27. A spring is fixedly connected inside the sleeve 28. A sliding rod 29 is fixedly connected to the other end of the spring. The sliding rod 29 is inside the sleeve 28 and slidably connected to the sleeve 28. The dust collection port 30 is larger than the cross-section of the collection trough 26. The length of the collection trough 26 is the same as the inner diameter of the inner wall 7. A dust discharge valve 9 is provided on the outer side of the box body 3 at a position relative to the dust collection box 8. To ensure the normal operation of the dust removal mechanism 12, the shape of the fan blade 11 needs to be designed, and the collection trough 26 cannot be too large. To prevent excessive dust from overflowing from the collection trough 26, an inner wall 7 and a dust collection box 8 are added inside the housing 3. The movable plate 27 on the side of the collection trough 26 away from the rotating shaft 10 is slidably connected to the inner wall 7. When the movable plate 27 rotates to the dust collection port 30 on the dust collection box 8, the spring in the sleeve 28 pushes the sliding rod 29 outward, thereby opening the movable plate 27. The dust collected in the collection trough 26 enters the dust collection box from the dust collection port 30. As it continues to rotate, the movable plate 27 moves under the action of the box wall on the side of the dust collection port 30. When plate 27 closes and presses against slide bar 29, it in turn presses against spring. During the rotation of collection trough 26, the dust in collection trough 26 automatically enters dust collection box 8 under the action of centrifugal force. The opening direction of movable plate 27 is consistent with the rotation direction of rotating shaft 10 to ensure that the opening and closing of movable plate 27 is normal. A limiting mechanism is added between movable plate 27 and collection trough 26, such as adding a rope connection between the outside of sleeve 28 and movable plate 27, to prevent the movable plate from opening too much and damaging collection trough 26. After a period of time, the dust discharge valve 9 can be opened directly to clean the dust collected in dust collection box 8 without worrying about dust overflowing from collection trough 26.

[0032] Preferably, the bottom plate of the collection tank 26 is tilted downward at a certain angle away from the rotating shaft 10. This causes the dust collected in the collection tank 26 to move away from the rotating shaft 10 under the action of gravity and inertia, further ensuring that the dust in the collection tank 26 can successfully enter the dust collection box 8.

[0033] Preferably, the interior of the dust collection box 8 is funnel-shaped. Dust entering the dust collection box 8 falls more slowly, making it less likely to be stirred up, and it is also less likely to overflow, thus preventing dust in the dust collection box 8 from re-entering the box body 3 and entering the air.

[0034] Working principle: Dust-laden air entering through the first air inlet 36 passes through the second filter 31, which filters out larger dust particles. The fan blades 11 below the second filter 31, driven by the wind, rotate the shaft 10, which in turn rotates the scraper 25 below the second filter 31, scraping away the dust adhering to it. The fallen dust is collected in the collection trough 26. As the collection trough 26 rotates with the shaft 10, the dust falls into the dust collection box 8, keeping the second filter 31 clean and ensuring its continuous dust removal effect. After removing larger dust particles, the dust concentration in the dust-laden air decreases, and the wind speed drops. At this point, dust-laden air enters the water washing tank 14, forming bubbles that rise in the water. Under the action of the perforated plate 17, the ultrasonic generator 18, and the packing layer 16, the time the dust-laden bubbles spend in the water is extended, increasing the surface area in contact with the water and improving the dust removal effect. The dust-removed air is discharged from the second air outlet 32. At the same time, the water circulation filtration mechanism causes the water in the water washing tank 14 to circulate from top to bottom. The ultrasonic generator 18 can also clean the dust adhering to the packing layer 16. The dust-laden water is discharged into the filter box as the water circulation filtration mechanism operates, always keeping the dust concentration in the water washing tank 14 low, and the packing layer 16 clean and not clogged, thus ensuring the dust removal effect.

[0035] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-stage dust removal device for mining areas, comprising a coarse dust filtration chamber (1) and a fine dust filtration chamber (2), wherein the coarse dust filtration chamber (1) comprises a housing (3), a first air inlet (36) is provided on the lower part of the side wall of the housing (3), the first air inlet (36) is connected to a suction fan (5), a first air outlet (37) is provided on the upper part of the housing (3), a second filter screen (31) is provided in the middle of the housing (3), the first air inlet (36) and the first air outlet (37) are respectively located on the upper and lower sides of the second filter screen (31), and the fine dust filtration chamber (2) comprises a washing tank (14), characterized in that: The washing tank (14) has a packing layer (16) in the middle. The washing tank (14) has an ultrasonic generator (18) and a second air inlet (38) on the lower side wall. The first air outlet (37) and the second air inlet (38) are connected by a duct (13). The washing tank (14) has a second air outlet (32) and a water inlet (33) on the top. The washing tank (14) has a second water pipe (35) connected to the bottom. The second water pipe (35) is connected to a water circulation filter mechanism. The water inlet (33) is connected to the water circulation filter mechanism.

2. The multi-stage dust removal device for mining areas according to claim 1, characterized in that: A perforated plate (17) is provided between the second air inlet (38) and the packing layer (16). The edge of the perforated plate (17) is fixedly connected to the inner wall of the washing tank (14). The perforated plate (17) is inclined upward along the direction away from the second air inlet (38).

3. A multi-stage dust removal device for mining areas according to claim 1, characterized in that: The water circulation mechanism includes a filter box (15), and a first filter screen (21) is provided inside the filter box (15). The first filter screen (21) divides the filter box (15) into left and right parts. The left side of the filter box (15) is connected to the second water guide pipe (35), and the right side of the filter box (15) is connected to the water inlet (33) via a first water guide pipe (34). A water pump (22) is provided on the first water guide pipe (34).

4. A multi-stage dust removal device for mining areas according to claim 3, characterized in that: The second water pipe (35) is provided with a first flow control valve (19), and the first water pipe (34) is provided with a second flow control valve (20).

5. A multi-stage dust removal device for mining areas according to claim 1, characterized in that: The second filter screen (31) is circular, and a frame (23) is provided on the outer edge of the second filter screen (31). The frame (23) is fixedly connected to the inner wall of the box (3). A support plate (24) is provided along the diameter direction of the second filter screen (31). A dust removal mechanism (12) is connected to the lower side of the support plate (24). The dust removal mechanism (12) includes a rotating shaft (10). The rotating shaft (10) is located at the center of the support plate (24) and is rotatably connected to the support plate (24). Two sets of fan blades (11) and two sets of scrapers (25) are fixedly connected to the rotating shaft (10). The two sets of fan blades (11) and scrapers (25) are arranged in a centrally symmetrical manner. The length of the scraper (25) is greater than or equal to the radius of the second filter screen (31). A collection groove (26) with a U-shaped cross-section is provided below the scraper (25). The collection groove (26) is fixedly connected to the rotating shaft (10). A movable plate (27) is provided on the side of the collection groove (26) away from the rotating shaft (10).

6. A multi-stage dust removal device for mining areas according to claim 5, characterized in that: The bottom of the housing (3) is provided with a guide plate (6) for guiding the air direction, and the air inlet end of the suction fan (5) is connected to a dust suction hood (4).

7. A multi-stage dust removal device for mining areas according to claim 5, characterized in that: Below the second filter screen (31) is an annular inner wall (7), inside which is a dust collection box (8), and on the dust collection box (8) is a dust collection port (30). The movable plate (27) is rotatably connected to one side wall of the collection trough (26), and the opening direction of the movable plate (27) is consistent with the rotation direction of the rotating shaft (10). A sleeve (28) is fixedly connected to the other side wall of the collection trough (26), and the sleeve (28) is close to... A spring is fixedly connected inside the sleeve (28) near the movable plate (27), and a slide rod (29) is fixedly connected to the other end of the spring. The slide rod (29) is inside the sleeve (28) and slidably connected to the sleeve (28). The dust collection port (30) is larger than the cross-section of the collection trough (26). The length of the collection trough (26) is the same as the inner diameter of the inner wall (7). A dust discharge valve (9) is provided on the outside of the box (3) at a position relative to the dust collection box (8).

8. A multi-stage dust removal device for mining areas according to claim 7, characterized in that: The bottom plate of the collection tank (26) is tilted downward at a certain angle in a direction away from the rotating shaft (10).

9. A multi-stage dust removal device for mining areas according to claim 7, characterized in that: The interior of the dust collection box (8) is funnel-shaped.

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