A dust removal device for dry coal separation

Abstract

The application provides a dust removal device for dry coal separation, and belongs to the technical field of dry coal separation. The dust removal device for dry coal separation comprises a dust suction hood, two dust suction ports, a first air pipe, a dust screening mechanism, a dust fan groove, a first dust fan, an air outlet, a baffle, a coarse material port and a fine material port. The dust screening mechanism comprises a screening box. The dust screening mechanism screens the fragments in the dust mixed air sucked by the dust suction ports and performs first purification on the sucked air, so as to filter the larger dust particles in the sucked air and recycle the gangue and fine coal fragments, thereby avoiding waste of coal resources.

Description

Technical Field

[0001] This invention belongs to the field of dry coal preparation technology, and specifically relates to a dust removal device for dry coal preparation. Background Technology

[0002] Dry coal preparation utilizes the inertial force generated by bed vibration to cause the material near the bed surface in the lower layer to spiral and tumble from the discharge edge towards the back plate. Due to the obstruction of the back plate, the material is guided to tumble upwards. Coal with lower density preferentially enters the upper layer. The material in the upper layer is less affected by bed vibration and, under the action of gravity and the thrust of the back plate, slides down the surface towards the discharge edge, where the lowest density and lowest ash content coal is stripped away by the discharge baffle. The remaining material continues the cycle for the next period. Due to the vibration force and the pressure of the continuously entering material in the separating bed, the constantly tumbling material forms an approximately spiral motion, moving towards the gangue end. As the bed width gradually decreases, the surface coal is continuously stripped away, and the material undergoes multiple separations until finally the gangue and pyrite are discharged.

[0003] A search revealed a Chinese patent with authorization announcement number "114162578A" that discloses a buffer device for the gangue discharge outlet of a dry intelligent coal preparation system. This device includes a discharge pipe with several downwardly inclined buffer plates fixed to its inner wall, arranged alternately from top to bottom. Each buffer plate has a buffer layer. The buffer plates are fixedly connected to the discharge pipe via a connecting device, which includes a connecting block, connecting bolts, and a connecting plate. The connecting plate is fixedly connected to the buffer plate at an acute angle, and the connecting plate has a slot. In this invention, the gangue falls onto the buffer layer of the uppermost buffer plate and rolls down to the buffer layer of the buffer plates below it, thus reducing noise during the rolling motion. Furthermore, the buffer device reduces the speed at which the gangue falls onto the conveyor, thereby reducing the impact on the conveyor.

[0004] In the above-mentioned technical solution, the gangue falls onto the buffer layer of the uppermost buffer plate, and then rolls down to the buffer layer of the buffer plate below it, and so on, which reduces the noise when the gangue rolls down. Furthermore, the buffer device reduces the speed at which the gangue falls onto the conveyor, thereby reducing the impact on the conveyor. The above solution uses a purification and dust removal system with full baghouse dust collection and clean air coal preparation. However, using a high-powered exhaust fan during the dust removal process to ensure that dust does not leak out can cause some small coal particles to be sucked in by the exhaust fan. The inability to recover these small coal particles from the air not only increases the difficulty of dust removal but also wastes coal raw materials. Summary of the Invention

[0005] The purpose of this invention is to provide a dust removal device for dry coal preparation, which aims to solve the problem that in the existing technology, when using a high-power exhaust fan to ensure that dust does not leak out, some small coal particles are sucked in by the exhaust fan. The inability to recover small coal particles in the air not only increases the difficulty of dust removal work, but also causes waste of coal raw materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A dust removal device for dry coal preparation includes:

[0008] Vacuum hood;

[0009] The dust suction port is provided in two parts, both of which are located at the top of the dust suction hood.

[0010] The first air duct is fixedly connected to the upper end of the two dust suction ports;

[0011] A dust screening mechanism includes a screening box, a fan duct, a first fan, an air outlet, a baffle, a coarse material outlet, and a fine material outlet. The screening box is fixedly connected to one side of the first air duct. The fan duct is opened on one side inner wall of the screening box. The first fan is located in the fan duct. The air outlet is fixedly connected to one side inner wall of the fan duct. The baffle is fixedly connected to the upper inner wall of the screening box. The coarse material outlet is opened on the lower inner wall of the screening box. The fine material outlet is opened on the lower inner wall of the screening box.

[0012] The material storage mechanism is located on one side of the screening box.

[0013] In a preferred embodiment of the present invention, the material storage mechanism includes a baffle box, a limiting groove, a sliding plate, a connecting port, a socket, and a baffle plate. Two limiting grooves are provided, and multiple springs are provided. The baffle box is fixedly connected to one side of the screening box. The two limiting grooves are respectively opened on the inner walls of the two sides of the baffle box. The sliding plate is slidably connected to the two limiting grooves. The connecting port is opened on one side of the screening box. The socket is opened on the inner wall of one side of the coarse material outlet. The baffle plate is fixedly connected to one side of the sliding plate and slides within the connecting port and the socket.

[0014] As a preferred embodiment of the present invention, a plurality of springs are fixedly connected to one side of the slide plate and one side of the inner wall of the baffle box, a pull rod is fixedly connected to one side of the slide plate, and a pull block is fixedly connected to one side of the pull rod through the inner wall of the baffle box.

[0015] As a preferred embodiment of the present invention, a second air duct is fixedly connected to the upper end of the screening box, and an exhaust fan is fixedly connected to the inner circumference of the second air duct.

[0016] In a preferred embodiment of the present invention, a water tank is fixedly connected to the circumferential surface of the second air duct, an exhaust pipe is fixedly connected to the upper end of the water tank, a nozzle is fixedly connected to the lower end of the second air duct, a plurality of air outlet holes are provided at the lower end of the nozzle, and a support frame is fixedly connected to the circumferential surface of the water tank.

[0017] In a preferred embodiment of the present invention, a coarse material pipe is fixedly connected to the lower end of the coarse material inlet, a fine material pipe is fixedly connected to the lower end of the fine material inlet, and two receiving pipes are provided at the lower ends of the coarse material pipe and the fine material pipe.

[0018] As a preferred embodiment of the present invention, two sieve plates are fixedly connected to the inner circumference of the two dust suction ports, and the upper ends of the two sieve plates are respectively provided with a plurality of first sieve holes.

[0019] As a preferred embodiment of the present invention, the lower ends of the first air duct and the screening box are respectively provided with multiple sets of support mechanisms. Each set of support mechanisms includes a support plate and a suspension rope. There are two suspension ropes. The support plate is located at the lower end of the first air duct or the screening box, and the two suspension ropes are fixedly connected to the upper end of the support plate.

[0020] As a preferred embodiment of the present invention, the lower end of the dust collection hood is provided with a vibrating bed, a conveyor belt is driven through the vibrating bed, a wind box is fixedly connected to the lower end of the vibrating bed, and a second fan is fixedly connected inside the wind box.

[0021] As a preferred embodiment of the present invention, the upper end of the conveyor belt is provided with a plurality of second screen holes.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. With this device, dust and fine fragments, when sucked into the screening box, will hit one side of the baffle due to inertia and then fall. The air outlet is located at the blowing port of the first fan and is directed upwards at an angle. The dust and fine fragments falling from the baffle are blown up a certain distance by the first fan. The screening box has two feed inlets: a coarse material inlet and a fine material inlet. Because the density and mass of the fine coal fragments are relatively small, they are blown a longer distance by the first fan and fall into the fine material inlet. The denser and heavier gangue dust and fragments will drift a shorter distance and fall into the coarse material inlet. This device screens the fragments in the dust-air mixture sucked in by the dust inlet and performs the first purification of the sucked-in air, filtering out larger dust particles and recovering gangue and fine coal fragments to avoid the waste of coal resources.

[0024] 2. Through this device, dusty air in the second air duct is discharged into the water through the air outlet. The gas containing fine dust is discharged from the air outlet and then splits into tiny bubbles. When the bubbles are in the water, the water absorbs the fine dust in the bubbles to purify the air a second time. When the bubbles reach the water surface and burst, they are discharged from the exhaust pipe. Through two purification processes, large dust particles and small dust particles in the air are filtered out, ensuring that the discharged air is free of dust and impurities.

[0025] 3. With this device, both the second and first screen holes are inverted cone shapes, which makes it less likely for the first and second screen holes to be blocked by material particles during ventilation, effectively ensuring the continuous operation of the equipment. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the rear structure in this invention;

[0029] Figure 3 This is a first structural cross-sectional view of the present invention;

[0030] Figure 4 This is a cross-sectional view of the second structure in this invention;

[0031] Figure 5 For the present invention Figure 3 Enlarged view of point A in the middle;

[0032] Figure 6 For the present invention Figure 3 Enlarged view of point B in the middle;

[0033] Figure 7 For the present invention Figure 3 Enlarged view of point C in the middle;

[0034] Figure 8 For the present invention Figure 4 Enlarged view at point D;

[0035] Figure 9 For the present invention Figure 4 Enlarged view at point E in the middle;

[0036] Figure 10 For the present invention Figure 4 Enlarged view of point F in the middle.

[0037] In the diagram: 1. Dust hood; 2. Dust inlet; 3. Screen plate; 4. First screen hole; 5. First air duct; 6. Sieving box; 7. Fan slot; 8. First fan; 9. Air outlet; 10. Baffle; 11. Coarse material inlet; 12. Fine material inlet; 13. Exhaust fan; 14. Second air duct; 15. Material baffle box; 16. Limiting groove; 17. Slide plate; 18. Connection port; 19. Insertion port; 20. Material baffle plate; 21. Spring; 22. Pull rod; 23. Pull block; 24. Coarse material pipe; 25. Fine material pipe; 26. Material collection pipe; 27. Water tank; 28. Nozzle; 29. ​​Air outlet; 30. Exhaust pipe; 31. Vibrating bed; 32. Conveyor belt; 33. Air box; 34. Second fan; 35. Second screen hole; 36. Support plate; 37. Suspension rope; 38. Support frame. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1-10 The present invention provides the following technical solutions:

[0040] A dust removal device for dry coal preparation includes:

[0041] Vacuum hood 1;

[0042] There are two suction ports 2, both of which are located at the top of the dust collection hood 1.

[0043] The first air duct 5 is fixedly connected to the upper ends of the two dust suction ports 2;

[0044] The dust screening mechanism includes a screening box 6, a fan trough 7, a first fan 8, an air outlet 9, a baffle 10, a coarse material outlet 11, and a fine material outlet 12. The screening box 6 is fixedly connected to one side of the first air duct 5. The fan trough 7 is opened on one side inner wall of the screening box 6. The first fan 8 is located in the fan trough 7. The air outlet 9 is fixedly connected to one side inner wall of the fan trough 7. The baffle 10 is fixedly connected to the upper inner wall of the screening box 6. The coarse material outlet 11 is opened on the lower inner wall of the screening box 6. The fine material outlet 12 is opened on the lower inner wall of the screening box 6.

[0045] The material storage mechanism and the material discharging mechanism are located on one side of the screening box 6.

[0046] In a specific embodiment of the present invention, the dust suction hood 1 covers the upper side of the vibrating bed 31, preventing dust generated during the shaking of the coal from leaking out of the dust suction hood 1. During coal preparation on the vibrating bed 31, coal and gangue dust and fine fragments are drawn into the first air duct 5 through the dust suction port 2, and then into the screening box 6 for the first screening process. When the dust and fine fragments are drawn into the screening box 6, they will impact one side of the baffle 10 due to inertia and then fall. The air outlet 9 is located at the blowing port of the first fan 8 and guides the air upwards at an angle. The dust and fine fragments falling from the baffle 10 are blown up a certain distance by the first fan 8. The screening box 6 is equipped with a coarse material inlet 11 and a... The fine material inlet 12 has two feed ports. Due to the relatively low density and mass of the fine coal fragments, they are blown a longer distance by the first blower 8 and fall into the fine material inlet 12. Meanwhile, the denser and heavier gangue dust and fragments drift a shorter distance and fall into the coarse material inlet 11. This process screens the fragments in the dust-air mixture sucked in by the dust suction port 2 and performs the first purification of the sucked-in air. It filters out larger dust particles in the sucked-in air and recovers the gangue and fine coal fragments, avoiding the waste of coal resources. The first blower 8 in this scheme is existing technology and will not be described in detail here.

[0047] Please refer to the details. Figures 1-10 The material storage mechanism includes a baffle box 15, a limiting groove 16, a sliding plate 17, a connecting port 18, a plug 19, and a baffle plate 20. There are two limiting grooves 16 and multiple springs 21. The baffle box 15 is fixedly connected to one side of the screening box 6. The two limiting grooves 16 are respectively opened on the inner walls of the two sides of the baffle box 15. The sliding plate 17 is slidably connected to the two limiting grooves 16. The connecting port 18 is opened on one side of the screening box 6. The plug 19 is opened on one side of the inner wall of the coarse material outlet 11. The baffle plate 20 is fixedly connected to one side of the sliding plate 17 and slides within the connecting port 18 and the plug 19.

[0048] In this embodiment: the limiting groove 16 is in the baffle box 15 to limit the sliding of the slide plate 17, so that the slide plate 17 will not deviate when sliding in the limiting groove 16. The baffle plate 20 is connected to one end of the slide plate 17 and inserted into the socket 19 and the connection port 18 to seal the coarse material port 11 and the fine material port 12, so that the lower end of the screening box 6 is a closed space, so that the first air duct 5 and the screening box 6 have only one air inlet, the dust suction port 2, so that the dust suction hood 1 can continuously absorb the dust-containing gas in the vibrating bed 31.

[0049] Please refer to the details. Figures 1-10 Multiple springs 21 are fixedly connected to one side of the slide plate 17 and one side of the inner wall of the baffle box 15. A pull rod 22 is fixedly connected to one side of the slide plate 17. A pull block 23 is fixedly connected to one side of the pull rod 22 through the inner wall of one side of the baffle box 15.

[0050] In this embodiment: the pull block 23 is used to pull the pull rod 22. The upper inner wall of the partition and the connecting port 18 between the coarse material port 11 and the fine material port 12 is in contact with the upper end of the baffle plate 20. After the dust removal has been carried out for a period of time, the material on the baffle plate 20 accumulates. Pulling the pull block 23 causes the slide plate 17 to drive the baffle plate 20 to slide to one side of the pull block 23. At this time, the slide plate 17 compresses multiple springs 21 to contract. The baffle plate 20 slides into the baffle box 15 to contact the seal of the coarse material port 11 and the fine material port 12, so that the material at the upper end of the baffle plate 20 falls from the coarse material port 11 and the fine material port 12 for collection. After the material accumulated on the baffle plate 20 is discharged, the pull block 23 is released. The springs 21 that were previously compressed and contracted rebound, and the baffle plate 20 is pushed into the insertion port 19 to reseal the lower end of the screening box 6.

[0051] Please refer to the details. Figures 1-10 The upper end of the screening box 6 is fixedly connected to a second air duct 14, and the inner circumference of the second air duct 14 is fixedly connected to an exhaust fan 13.

[0052] In this embodiment, the exhaust fan 13 is fixed to the inner wall of the second air duct 14 to perform exhaust and dust extraction. The exhaust fan 13 draws air from the vicinity of the dust hood 1 to create a negative pressure around the dust hood 1, preventing dust from overflowing and keeping the coal preparation system clean. The dust is sucked from the dust hood 1 into the screening box 6 for the first step of purification to screen out larger dust particles. The remaining air containing fine dust is discharged into the second air duct 14 for further purification. The exhaust fan 13 in this scheme is existing technology and will not be described in detail here.

[0053] Please refer to the details. Figures 1-10 A water tank 27 is fixedly connected to the circumferential surface of the second air duct 14. An exhaust pipe 30 is fixedly connected to the upper end of the water tank 27. A nozzle 28 is fixedly connected to the lower end of the second air duct 14. Multiple air outlets 29 are opened at the lower end of the nozzle 28. A support frame 38 is fixedly connected to the circumferential surface of the water tank 27.

[0054] In this embodiment: the water tank 27 is filled with purified water, the nozzle 28 is used to increase the air outlet area, the air outlet end of the second air duct 14 is submerged in the water, and the circumferential surface of the second air duct 14 is in contact with the water tank 27 so that there is only one air outlet in the water tank 27, the exhaust pipe 30. The dusty air in the second air duct 14 is discharged into the water through the air outlet 29. The gas containing fine dust is discharged from the air outlet 29 and then splits into a pair of tiny bubbles. When the bubbles are in the water, the purified water absorbs the fine dust in the bubbles to purify the air a second time. When the bubbles are attached to the water surface and burst, they are discharged from the exhaust pipe 30. Through two purifications, large dust particles and small dust particles in the air are filtered out to purify the discharged air twice, ensuring that the discharged air is free of dust impurities. The support frame 38 is connected to the ground to support the water tank 27.

[0055] Please refer to the details. Figures 1-10 The lower end of the coarse material inlet 11 is fixedly connected to a coarse material pipe 24, and the lower end of the fine material inlet 12 is fixedly connected to a fine material pipe 25. The lower ends of the coarse material pipe 24 and the fine material pipe 25 are provided with two receiving pipes 26.

[0056] In this embodiment, the materials falling from the coarse material inlet 11 and the fine material inlet 12 fall into the coarse material pipe 24 and the fine material pipe 25 respectively. The coarse material pipe 24 and the receiving pipe 26 are respectively provided with a coal recovery pipe 26 and a gangue recovery pipe 26 at their lower outlets to recover the materials from the dust purification area.

[0057] Please refer to the details. Figures 1-10 Two sieve plates 3 are fixedly connected to the inner circumference of the two dust suction ports 2, and multiple first sieve holes 4 are opened at the upper end of the two sieve plates 3 respectively.

[0058] In this embodiment, the screen plate 3 is fixed to the inner wall of the dust inlet 2 to filter large pieces of coal, so as to prevent large coal particles from being shaken into the dust inlet 2 due to the shaking of the vibrating bed 31 during coal sorting. The first screen hole 4 is used to absorb dusty air, and the lower opening of the first screen hole 4 is larger than the upper opening, so that the first screen hole 4 is not easily blocked by material particles, effectively ensuring the continuous operation of the equipment.

[0059] Please refer to the details. Figures 1-10 The lower ends of the first air duct 5 and the screening box 6 are respectively provided with multiple sets of support mechanisms. Each set of support mechanisms includes a support plate 36 and a suspension rope 37. There are two suspension ropes 37. The support plate 36 is located at the lower end of the first air duct 5 or the screening box 6. The two suspension ropes 37 are fixedly connected to the upper end of the support plate 36.

[0060] In this embodiment: the support plate 36 is located at the lower end of the first air duct 5 and the screening box 6 to fix the first air duct 5 and the screening box 6. The suspension rope 37 is fixed to the support plate 36 by bolts, so that the connection between the support plate 36 and the suspension rope 37 is tighter and less prone to shaking. The suspension rope 37 is connected to the ceiling in the equipment room to support the first air duct 5 and the screening box 6.

[0061] Please refer to the details. Figures 1-10 The lower end of the dust collection hood 1 is provided with a vibrating bed 31, and a conveyor belt 32 is connected to the vibrating bed 31. A bellows 33 is fixedly connected to the lower end of the vibrating bed 31, and a second fan 34 is fixedly connected inside the bellows 33.

[0062] In this embodiment: the conveyor belt 32 transports the coal to be sorted, the vibrating bed 31 screens the coal by vibration, and the screened clean coal and gangue fall into different receiving pipes 26 respectively. The air box 33 is used to load the second blower 34, and the connection between the vibrating bed 31 and the air box 33 is provided with an opening. The second blower 34 blows air from the underside of the conveyor belt 32 to the coal to be sorted, so that the dust below the coal is blown into the dust suction port 2 for treatment. The second blower 34 disturbs and settles the material, which works in conjunction with the vibrating bed 31 to screen the material. How the second blower 34, the vibrating bed 31 and the conveyor belt 32 use wind and vibration to screen the coal is the existing technology in dry coal preparation, which will not be elaborated in detail here.

[0063] Please refer to the details. Figures 1-10 The upper end of the conveyor belt 32 is provided with multiple second screen holes 35.

[0064] In this embodiment: the output end of the second blower 34 blows air onto the coal on the conveyor belt 32 through the second screen hole 35. The second screen hole 35 is an inverted cone shape, so that the dust above the conveyor belt 32 will not fall from the second screen hole 35. In conjunction with the blowing of the second blower 34, the air box 33 is kept under positive pressure, which further ensures that dust will not fall into the air box 33.

[0065] The working principle and usage process of this invention are as follows: When coal is prepared on the vibrating bed 31, coal and gangue dust and fine fragments are sucked into the first air duct 5 through the dust inlet 2, and then sucked into the screening box 6 for the first screening process. When the dust and fine fragments are sucked into the screening box 6, they will hit one side of the baffle 10 due to inertia and then fall. The air outlet 9 is located at the blowing port of the first fan 8 and guides the air obliquely upward. The dust and fine fragments falling from the baffle 10 are blown up a certain distance by the first fan 8. The screening box 6 is provided with two feed inlets: a coarse material inlet 11 and a fine material inlet 12. Because the density and mass of the fine coal fragments are relatively small, they are blown a longer distance by the first fan 8 and fall into the fine material inlet 12. The gangue dust and fragments, which have a larger density and mass, float. The distance will be shorter and it will fall into the coarse material inlet 11 to screen the dust mixed with the air sucked in by the dust suction port 2 and to perform the first purification of the sucked air. This filters out the larger dust particles in the sucked air and recovers the gangue and fine coal fragments. After that, the air is introduced into the second air duct 14. The dusty air in the second air duct 14 is discharged into the water through the air outlet 29. The gas containing fine dust is discharged from the air outlet 29 and is divided into a pair of small bubbles. When the bubbles are in the water, the water absorbs the fine dust in the bubbles to perform the second purification of the air. When the bubbles are attached to the water surface and burst, they are discharged from the exhaust pipe 30. Through two purifications, large dust particles and small dust particles in the air are filtered out to purify the discharged air twice, ensuring that the discharged air is free of dust impurities.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dust removal device for dry coal preparation, characterized in that, It includes a dust suction hood (1), a dust suction port (2), a dust separation and screening mechanism, a material feeding mechanism, and a material storage mechanism, wherein: Both suction ports (2) are located at the top of the suction hood (1); a first air duct (5) is fixedly connected to the top of the two suction ports (2); a sieve plate (3) is fixedly connected to the inner circumference of the suction port (2), and a plurality of first sieve holes (4) are provided at the top of the sieve plate (3); the lower opening of the first sieve hole (4) is larger than the upper opening; The dust screening mechanism includes a screening box (6), a fan trough (7), a first fan (8), an air outlet (9), a baffle (10), a coarse material inlet (11), and a fine material inlet (12). The screening box (6) is fixedly connected to one side of the first air duct (5). The fan trough (7) is opened on one side of the inner wall of the screening box (6). The first fan (8) is located in the fan trough (7). The air outlet (9) is fixedly connected to one side of the inner wall of the fan trough (7). The baffle (10) is fixedly connected to the upper inner wall of the screening box (6). The coarse material inlet (11) is located on the lower inner wall of the screening box (6), and the fine material inlet (12) is located on the lower inner wall of the screening box (6); a second air duct (14) is fixedly connected to the upper end of the screening box (6), and an exhaust fan (13) is fixedly connected to the inner circumference of the second air duct (14); a coarse material pipe (24) is fixedly connected to the lower end of the coarse material inlet (11), and a fine material pipe (25) is fixedly connected to the lower end of the fine material inlet (12); two receiving pipes (26) are provided at the lower ends of the coarse material pipe (24) and the fine material pipe (25); The feeding mechanism is located on one side of the screening box (6); the storage mechanism includes a baffle box (15), a limiting groove (16), a sliding plate (17), a connecting port (18), a plug (19), and a baffle plate (20). There are two limiting grooves (16) and multiple springs (21). The baffle box (15) is fixedly connected to one side of the screening box (6). The two limiting grooves (16) are respectively opened on the inner walls of the two sides of the baffle box (15). The sliding plate (17) is slidably connected in the two limiting grooves (16). The connecting port (18) is open. Located on one side of the screening box (6), the inlet (19) is opened on the inner wall of one side of the coarse material inlet (11). The baffle plate (20) is fixedly connected to one side of the slide plate (17) and slides in the connection port (18) and the inlet (19). Multiple springs (21) are fixedly connected to one side of the slide plate (17) and one side of the inner wall of the baffle box (15). A pull rod (22) is fixedly connected to one side of the slide plate (17). A pull block (23) is fixedly connected to one side of the pull rod (22) through the inner wall of one side of the baffle box (15). The air outlet (9) is located at the blowing port of the first fan (8) and guides the air obliquely upward; a water tank (27) is fixedly connected to the circumferential surface of the second air duct (14), an exhaust pipe (30) is fixedly connected to the upper end of the water tank (27), a nozzle (28) is fixedly connected to the lower end of the second air duct (14), and multiple air outlets (29) are opened at the lower end of the nozzle (28); a support frame (38) is fixedly connected to the circumferential surface of the water tank (27). The lower ends of the first air duct (5) and the screening box (6) are respectively provided with multiple sets of support mechanisms. Each set of support mechanisms includes a support plate (36) and a suspension rope (37). There are two suspension ropes (37). The support plate (36) is located at the lower end of the first air duct (5) or the screening box (6). The two suspension ropes (37) are fixedly connected to the upper end of the support plate (36). The lower end of the dust collection hood (1) is provided with a vibrating bed (31), and a conveyor belt (32) is connected inside the vibrating bed (31). A bellows (33) is fixedly connected to the lower end of the vibrating bed (31), and a second fan (34) is fixedly connected inside the bellows (33). The upper end of the conveyor belt (32) is provided with multiple second screen holes (35); The second sieve hole (35) is an inverted cone shape.

2. The dust removal device for dry coal preparation according to claim 1, characterized in that: The upper end of the conveyor belt (32) is provided with a plurality of second screen holes (35).

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