Clean briquette coal finished product dust purifying and screening device and method

Abstract

The invention relates to the technical field of clean briquette coal production equipment, in particular to a clean briquette coal finished product dust purifying and screening device and method.The clean briquette coal finished product dust purifying and screening device comprises a sleeve, a conveying belt is arranged in the sleeve and used for conveying clean coal, the sleeve is composed of fixed sections at the two ends and a rotating section in the middle, and the rotating section is rotationally matched with the two fixed sections; a negative pressure dust raising piece is arranged on the rotating section; a dust raising piece is arranged on the inner side of the rotating section, the dust raising piece raises coal dust on the conveying belt through airflow disturbance, and the negative pressure dust collector adsorbs and collects the raised dust; according to the invention, the jet heads and the dust collection hoppers which are distributed in the circumferential direction of the rotating section are matched with the V-shaped conveying belt and the through holes to form up-down bidirectional airflow, so that dust on the surface, gaps and the bottom of briquette coal and on the surface of the conveying belt can be comprehensively raised and quickly adsorbed, the purification efficiency is high, and no residue exists.

Description

Technical Field

[0001] This application relates to the technical field of clean coal production equipment, and in particular to a clean coal finished product dust purification and screening device and method. Background Technology

[0002] Clean coal dust refers to the fine solid particles generated during the production and storage processes of clean coal briquettes, which are made from clean coal, binders, desulfurizing agents, and combustion improvers through crushing, mixing, molding, and drying. These particles are produced due to surface shedding, friction, wear, and collision during screening, conveying, transfer, and stacking. This dust mainly consists of fine coal powder particles and unconsolidated binder and desulfurizing agent powders.

[0003] Clean coal dust purification and screening refers to an integrated process for the centralized collection and purification of coal powder, auxiliary material fine powder, and micro-particles generated during the grading and screening of clean coal products. This process simultaneously achieves particle size classification and impurity separation while using methods such as closed collection, negative pressure suction, and multi-stage dust removal to centrally capture and purify the dispersed dust. For example, the dust purification device for a coal conveyor (application number 2015102150703) is used to purify dust during the coal conveyor's transport of coal powder. It includes a coal drop pipe connected to a coal mill and located above the conveyor belt, with steam nozzles connected to a steam treatment device installed on the drop pipe. A dust collector cover is also installed on one side of the drop pipe along the direction of the conveyor belt, with steam nozzles on the top surface of the cover spraying waste heat steam onto it. A dust collector box is also installed on the other side of the drop pipe, with steam nozzles on its top cover. Waste heat steam is used to purify the dust, reducing dust pollution and minimizing coal loss.

[0004] However, the existing technologies mentioned above use waste heat steam generated by boilers or other equipment as a dust removal medium when purifying dust from finished coal products. The coal powder is uniformly humidified during the falling and conveying process to suppress dust. However, the clean coal briquettes contain binders, desulfurizing agents and other components, which are easily softened, have their surface peeled off and clump together when exposed to steam or moisture. This not only reduces the strength and yield of the briquettes, but also causes screen blockage and conveying stagnation, which in turn exacerbates production failures.

[0005] Existing technologies rely on humidification to suppress dust, but do not capture, filter, or purify the dust-laden gas that has already been generated. Fine dust will still escape with the airflow, making it impossible to achieve emission standards and meet environmental protection requirements.

[0006] Based on this, as stated above, there is still room for improvement in existing technologies for purifying dust from finished coal products. Summary of the Invention

[0007] To address the aforementioned technical problems, this application provides a clean coal briquette dust purification and screening device and method, employing the following technical solution: In the first aspect, a dust purification and screening device for clean coal finished product includes a sleeve, a conveyor belt is provided inside the sleeve for conveying clean coal, and the sleeve is composed of fixed sections at both ends and a rotating section in the middle, with the rotating section rotatingly cooperating with the two fixed sections. A negative pressure dust collector is installed on the rotating section; a dust-raising component is installed inside the rotating section. The dust-raising component raises the coal dust on the conveyor belt through airflow disturbance, and the negative pressure dust collector adsorbs and collects the raised dust. The negative pressure vacuum cleaner includes multiple suction buckets set on the rotating section. The suction buckets are embedded in the rotating section with their suction ends facing the conveyor belt. One end of the suction bucket is equipped with a conveying pipe. The multiple suction buckets and dust-raising components are evenly distributed circumferentially on the rotating section.

[0008] Preferably, a support ring is provided on one side of the fixed section; The support ring includes a fixed part connected to a fixed section, a rotating ring rotatably provided on one side of the fixed part, and one end of the conveying pipe extends through the rotating ring into the fixed part; An air intake hole is provided on the fixing part.

[0009] Preferably, the dust collection hopper is equipped with a mesh to prevent large coal particles from entering the dust collection hopper and thus prevent clogging.

[0010] Preferably, the dust-generating component includes an air guide pipe disposed on the inner side of the rotating section, and multiple jet nozzles disposed on the air guide pipe facing the conveyor belt. The jet nozzles are used to spray airflow onto the conveyor belt to raise the dust adhering to the surface of the finished coal product.

[0011] Preferably, a connecting ring is provided within the fixed section; The connecting ring includes a fixed ring set within a fixed section, a rotating ring rotatably configured at one end of the fixed ring, and an air guide tube passing through the rotating ring and communicating with the inside of the fixed ring at one end. An air intake pipe is installed on the fixed ring.

[0012] Preferably, the rotating section is provided with multiple circumferentially distributed brushes that extend toward the conveyor belt, and flexible curtains are provided at both ends of the two fixed sections.

[0013] Preferably, a gear ring is provided on the rotating section, and a drive gear that meshes with the gear ring is rotatably provided on the fixed section. The drive gear is used to drive the rotating section to rotate relative to the fixed section.

[0014] Preferably, the conveyor belt has a V-shaped structure that is low in the middle and high on both sides, and the conveyor belt has several evenly distributed through holes.

[0015] Secondly, a method for purifying and screening dust from clean coal briquettes, the method of which includes the following steps: S1: Material conveying; Start the device, and the clean coal briquettes enter the V-shaped conveyor belt inside the sleeve. The V-shaped structure gathers the coal briquettes in the middle and conveys them stably. At the same time, start the external compressed air source and negative pressure equipment to provide power for dust control and dust collection operations. S2: Airflow supply; The rotating section rotates relative to the fixed section, causing the air duct, jet head, and dustbin to rotate synchronously in the circumferential direction. External compressed gas enters the air duct through the air inlet pipe, fixed ring, and rotating ring. Negative pressure is transmitted to the dustbin through the suction hole, fixed part, and rotating ring. S3: Dust Suspension; The jet nozzle sprays directional airflow onto the surface of the finished coal product, while the airflow passes through the conveyor belt through-holes and blows the finished coal product from below, forming a two-way airflow disturbance, which thoroughly lifts the dust from all parts of the coal and the surface of the conveyor belt, keeping it in a suspended state. S4: Finished product output; Flexible curtain sealing sleeves at both ends of the sleeve prevent dust from overflowing; Clean coal briquettes that have completed dust purification are continuously conveyed by the conveyor belt.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention uses circumferentially distributed jet nozzles and dust collection buckets in a rotating section, combined with a V-shaped conveyor belt and through holes to form a bidirectional airflow, which can comprehensively lift and quickly adsorb dust from the surface, gaps, bottom, and conveyor belt surface of the finished coal product, resulting in high purification efficiency and no residue.

[0017] 2. The present invention achieves dynamic sealing connection between rotating and fixed components through connecting rings and support rings, which ensures smooth rotational dust collection and dust dispersion without interrupting the air path and negative pressure path, and the device operates continuously and stably.

[0018] 3. The conveyor belt of this invention adopts a V-shaped structure with a low middle and high sides, which enables the coal product to be automatically transported in the center, making it less likely to tip over, slip, or collide, thus reducing dust from the source; combined with flexible curtain seals at both ends, it further prevents dust from overflowing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure between the sleeve and the conveyor belt of the present invention.

[0021] Figure 3 This is a schematic diagram of the negative pressure vacuum cleaner of the present invention.

[0022] Figure 4 This is the present invention. Figure 3 Enlarged view of a portion of point A in the middle.

[0023] Figure 5 This is a cross-sectional view of the sleeve of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure between the dust-generating component and the sleeve of the present invention.

[0025] Figure 7 This is a schematic diagram of the dust-generating component of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the sweeping brush of the present invention.

[0027] Figure 9 This is a schematic diagram of the conveyor belt structure of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Sleeve; 11. Fixed section; 12. Rotating section; 2. Conveyor belt; 21. Through hole; 3. Negative pressure vacuum cleaner; 31. Vacuum hopper; 32. Conveying pipe; 4. Support ring; 41. Fixed part; 42. Rotating ring; 43. Suction hole; 44. Mesh; 5. Dust-raising component; 51. Air guide pipe; 52. Jet nozzle; 6. Connecting ring; 61. Fixed ring; 62. Rotating ring; 63. Air inlet pipe; 64. Sweeping brush; 65. Flexible curtain; 66. Gear ring; 67. Drive gear. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1 to 9 This application will be described in further detail.

[0030] This application discloses a clean coal finished product dust purification and screening device and method. Through rotary bidirectional airflow dust raising, circumferential negative pressure dust suction, V-shaped conveying with airflow holes and dynamic and static sealed air circuit connection, it realizes the integrated purification and screening of clean coal finished product with continuous conveying, all-round dust raising, high-efficiency dust suction, and anti-blocking and anti-overflow.

[0031] Reference Figure 1 , Figure 2 and Figure 3 As shown, a dust purification and screening device for clean coal products includes a sleeve 1, a conveyor belt 2 is installed inside the sleeve 1, the conveyor belt 2 is used to transport clean coal, the sleeve 1 is composed of fixed sections 11 at both ends and a rotating section 12 in the middle, the rotating section 12 is rotatably engaged with the two fixed sections 11.

[0032] A negative pressure dust collector 3 is installed on the rotating section 12; a dust-raising component 5 is installed on the inner side of the rotating section 12. The dust-raising component 5 raises the coal dust on the conveyor belt 2 through airflow disturbance, and the negative pressure dust collector 3 adsorbs and collects the raised dust.

[0033] During the coal finished product conveying process, the rotating section 12 rotates relative to the fixed section 11, and the dust collection hopper 31 and the dust raising component 5 move circumferentially with the rotating section 12. The support ring 4 on one side of the fixed section 11 provides support and sealing for the negative pressure passage. The fixed part 41 of the support ring 4 is fixedly connected to the fixed section 11, and the rotating ring 42 rotates with the fixed part 41. The conveying pipe 32 connected to one end of the dust collection hopper 31 passes through the rotating ring 42 and extends into the fixed part 41. The suction hole 43 on the fixed part 41 is connected to a negative pressure air source. After the negative pressure air source is started, the negative pressure enters the fixed part 41 through the suction hole 43, and then is transmitted to each dust collection hopper 31 through the rotating ring 42 and the conveying pipe 32, so that the dust collection end of the dust collection hopper 31 generates a stable negative pressure suction force.

[0034] Reference Figure 2 , Figure 3 and Figure 4 As shown, specifically, the negative pressure vacuum cleaner 3 includes multiple suction hoppers 31 mounted on the rotating section 12. The suction hoppers 31 are embedded in the rotating section 12, with their suction ends facing the conveyor belt 2, directly contacting suspended dust. They capture coal dust raised by the dust-raising component 5 through negative pressure suction. One end of each suction hopper 31 is equipped with a conveying pipe 32; the conveying pipe 32 connects the suction hopper 31 to the fixing part 41 of the support ring 4, forming a channel for dust conveying and negative pressure transmission. This conveys the dust captured by the suction hopper 31 to an external collection device, while simultaneously transmitting the suction force generated by the negative pressure air source. The multiple suction hoppers 31 and the dust-raising component 5 are evenly distributed circumferentially on the rotating section 12. A support ring 4 is provided on the fixed section 11 on one side; the support ring 4 receives an external negative pressure air source (through the air intake 43) and provides rotational support for the rotating ring 42; the rotating ring 42 rotates and cooperates with the fixed part 41 to adapt to the rotation of the rotating section 12, realizes the dynamic connection between the conveying pipe 32 and the fixed part 41, and at the same time plays a sealing role to prevent negative pressure leakage.

[0035] The support ring 4 includes a fixed part 41 connected to the fixed section 11. A rotating ring 42 is provided on one side of the fixed part 41. The rotating ring 42 can rotate flexibly relative to the fixed part 41, adapting to the rotation conditions of the rotating section 12, realizing the dynamic connection between the air guide pipe 51 and the fixed ring 61, and at the same time playing a sealing role to prevent the compressed airflow from leaking at the rotating connection. One end of the conveying pipe 32 passes through the rotating ring 42 and extends into the fixed part 41. An air suction hole 43 is provided on the fixed part 41. The air suction hole 43 serves as the access interface for the negative pressure air source, introducing the negative pressure generated by the external negative pressure equipment into the fixed part 41, providing a power source for the entire negative pressure dust collection device.

[0036] The dust-raising component 5 raises the coal dust on the conveyor belt 2 through airflow disturbance. Since the dust collection hopper 31 and the dust-raising component 5 are evenly distributed around the circumference, during rotation, the dust collection hopper 31 can cover the area above the conveyor belt 2 in all directions without dead angles, accurately sucking the raised suspended dust into the dust collection hopper 31. The sucked dust passes through the conveying pipe 32, the rotating ring 42, and the fixed part 41, and is finally discharged to the external dust collection equipment through the suction hole 43. When the rotating section 12 drives the dust collection hopper 31 and the conveying pipe 32 to rotate, the conveying pipe 32 drives the rotating ring 42 to rotate synchronously relative to the fixed part 41, realizing the dynamic sealing connection between the rotational motion and the negative pressure passage, ensuring that the negative pressure suction is continuous and stable and does not interrupt with the rotation of the rotating section 12.

[0037] Reference Figure 5 As shown, a mesh 44 is provided on the dust collection hopper 31. The mesh 44 is used to block large coal particles from entering the dust collection hopper 31 and prevent the dust collection hopper 31 from becoming clogged. The mesh 44 is fixedly connected to the dust collection hopper 31 and covers the dust collection port of the dust collection hopper 31. The aperture of the mesh 44 is smaller than the particle size of large coal particles but larger than the particle size of coal dust.

[0038] During operation, when the dust-raising component 5 stirs up coal dust and a small amount of large coal particles on the conveyor belt 2 through airflow disturbance, the grid 44 performs preliminary screening of the suspended materials. Because of its smaller particle size, the coal dust can easily pass through the grid 44 into the dust collection hopper 31, and then be discharged to the external receiving and collecting equipment via the conveying pipe 32, the fixing part 41, and the suction hole 43. However, because the large coal particles are larger than the mesh size of the grid 44, they are blocked outside the dust collection hopper 31 and cannot enter the hopper. Simultaneously, as the rotating section 12 rotates, the large coal particles blocked by the grid 44 fall back onto the conveyor belt 2 under gravity and continue to be conveyed, achieving preliminary separation of dust and large coal particles. This process neither affects dust adsorption nor wastes qualified coal.

[0039] Reference Figure 6 and Figure 7 As shown, specifically, the dust-generating component 5 includes an air guide pipe 51 disposed inside the rotating section 12. The air guide pipe 51 is provided with multiple jet nozzles 52 facing the conveyor belt 2. The jet nozzles 52 are used to spray airflow onto the conveyor belt 2 to raise the dust adhering to the surface of the finished coal product.

[0040] During operation, compressed air is introduced into the air guide pipe 51 from the external air source. The compressed air is then transported through the air guide pipe 51 to each jet nozzle 52. The jet nozzle 52 directs the compressed air towards the clean surface of the finished coal briquettes on the conveyor belt 2 and the surface of the conveyor belt 2. When the airflow acts on the surface of the coal briquettes, it generates a disturbance and impact force, which thoroughly blows away the dust adhering to the surface of the coal briquettes and the fine dust embedded in the gaps between the coal briquettes, causing the dust to detach from the surface of the finished coal briquettes and remain in a suspended state. At the same time, the airflow also disturbs the dust scattered on the conveyor belt 2, preventing the dust from accumulating on the surface of the conveyor belt 2 and being unable to be adsorbed.

[0041] Because multiple jet heads 52 are evenly distributed around the circumference and rotate synchronously with the rotating section 12, they can turbulent the airflow of the coal product on the conveyor belt 2 in all directions without dead angles, ensuring that the dust on the surface of the coal product at different locations can be effectively lifted. The lifted suspended dust will be immediately captured by the surrounding synchronously rotating dust collection hopper 31 (after being screened by the grid 44) ​​through negative pressure suction, realizing the synchronous synergy of airflow dust lifting and negative pressure dust collection, further improving the thoroughness of dust purification.

[0042] Reference Figure 8 As shown, a plurality of circumferentially distributed brushes 64 are provided in the rotating section 12, the brushes 64 extending toward the conveyor belt 2, and flexible curtains 65 are provided at both ends of the two fixed sections 11; a gear ring 66 is provided on the rotating section 12, and a drive gear 67 that meshes with the gear ring 66 is rotatably provided on the fixed section 11, the drive gear 67 being used to drive the rotating section 12 to rotate relative to the fixed section 11.

[0043] The connecting ring 6 includes a fixed ring 61 fixedly installed in the fixed section 11. A rotating ring 62 is rotatably installed on one side of the fixed ring 61. The rotating ring 62 is fixedly connected to the air guide pipe 51. The fixed ring 61 of the connecting ring 6 is fixedly installed in the fixed section 11. An air inlet pipe 63 is provided on the fixed ring 61 to provide stable rotational support for the rotating ring 62. At the same time, it serves as a transfer container for compressed airflow, receiving the compressed airflow input by the air inlet pipe 63, realizing stable distribution and conduction of airflow, and ensuring that the airflow is evenly delivered to the rotating ring 62.

[0044] During operation, an external compressed air source introduces compressed air into the fixed ring 61 through the air inlet pipe 63. The fixed ring 61, as a fixed receiving and conducting component for the airflow, stably delivers the compressed airflow into the rotating ring 62. Since the rotating ring 62 and the fixed ring 61 rotate in coordination, and the air guide pipe 51 is fixedly connected to the rotating ring 62 and rotates synchronously with the rotating section 12, when the rotating section 12 drives the air guide pipe 51 and the jet head 52 to rotate, the air guide pipe 51 will drive the rotating ring 62 to rotate synchronously relative to the fixed ring 61, realizing the dynamic connection between fixed air supply and rotating air delivery.

[0045] After the compressed airflow enters the air guide pipe 51 through the fixed ring 61 and the rotating ring 62, it is transported to each jet head 52 along the air guide pipe 51. The jet head 52 sprays the compressed airflow in a directional manner onto the surface of the finished coal on the conveyor belt 2 to complete the dust suppression operation. During the entire airflow transportation process, the sealing structure of the rotating ring 62 and the fixed ring 61 can effectively prevent the leakage of compressed airflow, ensure stable airflow pressure, and thus ensure that the dust suppression effect of the jet head 52 is always consistent. Together with the negative pressure dust collection device, it can achieve continuous operation of stable dust suppression and efficient dust collection.

[0046] Reference Figure 9As shown, the conveyor belt 2 has a V-shaped structure, lower in the middle and higher on both sides, and has several evenly distributed through holes 21. During operation, the clean coal briquettes are placed on the V-shaped conveyor belt 2. The V-shaped structure can utilize gravity to automatically gather the coal briquettes in the middle area of ​​the conveyor belt 2, preventing the coal briquettes from slipping to the sides during transportation. This ensures that the coal briquettes are always within the effective range of the jet nozzles 52 and the dust collection hopper 31, facilitating the precise action of the dust-raising component 5 and the negative pressure vacuum cleaner 3.

[0047] At the same time, part of the airflow generated by the external compressed air source is sprayed from above onto the surface of the coal product through the air guide pipe 51 and the jet nozzle 52 to lift up the dust. Another part of the airflow can pass through the through hole 21 on the conveyor belt 2 and blow from below the conveyor belt 2 to the bottom and sides of the coal product, forming a bidirectional airflow disturbance: the lower airflow can blow up the dust attached to the surface of the conveyor belt 2 and the bottom of the coal product, while the upper airflow acts on the dust on the top and sides of the coal product. The bidirectional synergy makes the dust more thoroughly removed and more evenly suspended.

[0048] In addition, the V-shaped structure can prevent scattered fine dust from spreading to both sides of the conveyor belt 2, reduce the diffusion range of dust in the sleeve 1, and facilitate the all-round capture of dust by the dust collection hopper 31; the through hole 21 can also help to discharge the dust accumulated on the surface of the conveyor belt 2, prevent dust from accumulating in the gaps of the conveyor belt 2, further improve the thoroughness of dust purification, and work together with the dust-raising component 5 and the negative pressure vacuum cleaner 3 to achieve efficient purification and screening.

[0049] Finally, the present invention also provides a method for purifying and screening dust from clean coal briquettes, the method of use of which includes the following steps: S1: Material conveying; Start the device, and the clean coal briquettes enter the V-shaped conveyor belt 2 inside the sleeve 1. The V-shaped structure gathers the coal briquettes in the middle and conveys them stably. At the same time, start the external compressed air source and negative pressure equipment to provide power for dust control and dust collection operations.

[0050] S2: Airflow supply; the rotating section 12 rotates relative to the fixed section 11, driving the air duct 51, the jet head 52, and the dust collection bucket 31 to rotate synchronously in the circumferential direction; external compressed gas enters the air duct 51 through the air inlet pipe 63, the fixed ring 61, and the rotating ring 62, and the negative pressure is transmitted to the dust collection bucket 31 through the suction hole 43, the fixed part 41, and the rotating ring 42.

[0051] S3: Dust suspension; the jet nozzle 52 sprays directional airflow onto the surface of the finished coal product, while the airflow passes through the through hole 21 of the conveyor belt 2 and blows the finished coal product from below, forming a two-way airflow disturbance, which thoroughly lifts the dust from various parts of the coal and the surface of the conveyor belt 2, making it suspended.

[0052] S4: Anti-clogging screening; Suspended dust is adsorbed by the rotating dust collection hopper 31 through negative pressure. The grid 44 at the front end of the dust collection hopper 31 blocks large coal particles from entering, avoiding pipe blockage. The blocked coal particles fall back to the conveyor belt 2, while the dust is discharged to the external collection equipment through the conveying pipe 32, the fixing part 41, and the suction hole 43.

[0053] S5: Finished product output; the flexible curtains 65 at both ends of the sleeve 1 seal the sleeve 1 to prevent dust from overflowing; the clean coal finished product that has completed dust purification is continuously conveyed with the conveyor belt 2 to achieve clean discharge, and the entire device continuously cycles to complete the purification and screening operation.

[0054] The embodiments listed in this specific description are preferred embodiments of the present invention, but this does not mean that the scope of protection of the present invention is limited thereto. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A dust purification and screening device for clean coal finished products, comprising a sleeve (1), characterized in that: The sleeve (1) is provided with a conveyor belt (2) for conveying clean coal. The sleeve (1) is composed of fixed sections (11) at both ends and a rotating section (12) in the middle. The rotating section (12) is rotatably engaged with the two fixed sections (11). A negative pressure dust collector (3) is installed on the rotating section (12); a dust-raising component (5) is installed on the inner side of the rotating section (12). The dust-raising component (5) raises the coal dust on the conveyor belt (2) by airflow disturbance, and the negative pressure dust collector (3) adsorbs and collects the raised dust. The negative pressure vacuum cleaner (3) includes multiple suction buckets (31) set on the rotating section (12). The suction buckets (31) are embedded in the rotating section (12) with their suction end facing the conveyor belt (2). One end of the suction bucket (31) is provided with a conveying pipe (32). Multiple suction buckets (31) and dust-raising components (5) are evenly distributed circumferentially on the rotating section (12).

2. The clean coal finished product dust purification and screening device according to claim 1, characterized in that: A support ring (4) is provided on the fixed section (11) on one side; The support ring (4) includes a fixed part (41) connected to the fixed section (11), and a rotating ring (42) is rotatably provided on one side of the fixed part (41). One end of the conveying pipe (32) extends through the rotating ring (42) into the fixed part (41). An air intake hole (43) is provided on the fixing part (41).

3. The dust purification and screening device for clean coal finished product according to claim 1, characterized in that: The dust collection hopper (31) is equipped with a grid (44) to block large coal particles from entering the dust collection hopper (31) and prevent the dust collection hopper (31) from becoming clogged.

4. The dust purification and screening device for clean coal finished product according to claim 1, characterized in that: The dust-raising component (5) includes an air guide pipe (51) provided inside the rotating section (12). The air guide pipe (51) is provided with multiple jet nozzles (52) facing the conveyor belt (2). The jet nozzles (52) are used to spray airflow onto the conveyor belt (2) to raise the dust adhering to the surface of the briquettes.

5. The dust purification and screening device for clean coal briquettes according to claim 4, characterized in that: A connecting ring (6) is provided inside the fixed section (11); The connecting ring (6) includes a fixed ring (61) provided in the fixed section (11), and a rotating ring (62) is rotatably provided at one end of the fixed ring (61). One end of the air guide tube (51) passes through the rotating ring (62) and communicates with the fixed ring (61). An air inlet pipe (63) is provided on the fixed ring (61).

6. The dust purification and screening device for clean coal briquettes according to claim 1, characterized in that: Multiple circumferentially distributed brushes (64) are provided in the rotating section (12), and the brushes (64) extend toward the conveyor belt (2). Flexible curtains (65) are provided at both ends of the two fixed sections (11).

7. The dust purification and screening device for clean coal finished product according to claim 1, characterized in that: A gear ring (66) is provided on the rotating section (12), and a drive gear (67) that meshes with the gear ring (66) is rotatably provided on the fixed section (11). The drive gear (67) is used to drive the rotating section (12) to rotate relative to the fixed section (11).

8. The dust purification and screening device for clean coal finished product according to claim 1, characterized in that: The conveyor belt (2) has a V-shaped structure with a low middle and high sides, and the conveyor belt (2) has several evenly distributed through holes (21).

9. A dust purification and screening method using a clean coal finished product dust purification and screening device as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Material conveying; Start the device, and the clean coal product enters the V-shaped conveyor belt (2) inside the sleeve (1). The V-shaped structure gathers the coal product in the middle for stable conveying; At the same time, start the external compressed air source and negative pressure equipment to provide power for dust and dust collection operations; S2: Airflow supply; The rotating section (12) rotates relative to the fixed section (11), driving the air guide pipe (51), jet head (52), and dust collection bucket (31) to rotate synchronously in the circumferential direction. External compressed gas enters the air guide pipe (51) through the air inlet pipe (63), fixed ring (61), and rotating ring (62). Negative pressure is transmitted to the dust collection bucket (31) through the suction hole (43), fixed part (41), and rotating ring (42). S3: Dust suspension; The jet nozzle (52) sprays directional airflow onto the surface of the coal product, and at the same time the airflow passes through the through hole (21) of the conveyor belt (2) and blows the coal product from below, forming a two-way airflow disturbance, which thoroughly lifts the dust from all parts of the coal product and the surface of the conveyor belt (2), making it suspended. S4: Finished product output; the flexible curtains (65) at both ends of the sleeve (1) seal the sleeve (1) to prevent dust from overflowing; the clean coal finished product with dust purification is continuously conveyed with the conveyor belt (2).

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