Feed coal classification screening device and method for semi-coke production

Abstract

The invention belongs to the field of coal screening, and particularly relates to a feed coal classification screening device and method for semi-coke production. The feed coal classification screening device comprises a base, and a multi-stage screening mechanism used for conducting step-by-step screening on raw materials is arranged above the base; and a driving mechanism for driving the multi-stage screening mechanism to rotate is arranged between the multi-stage screening mechanism and the base. The multi-stage screening mechanism comprises a screening frame used for screening large-particle raw materials and a screening barrel arranged on the surface of the screening frame in a sleeving mode and used for screening fine-particle raw materials, and a plurality of swing assemblies distributed in the circumferential direction of the screening barrel are arranged on the screening frame. The screening frame comprises a plurality of first fixing rings coaxial with the screening cylinder. According to the screening device, the first screening rods and the second screening rods can be driven to actively rotate in the screening process, the clamping stagnation state of raw materials is broken, the material clamping risk caused by extrusion in the gap between the two adjacent first screening rods or the gap between the two adjacent second screening rods is remarkably reduced, and the screening continuity is improved.

Description

Technical Field

[0001] The present invention belongs to the field of coal screening, and particularly relates to a device and method for grading and screening raw coal for semi-coke production. Background Art

[0002] Semi-coke (also known as semi-coke and coke powder) is a product of the pyrolysis of coal under medium and low temperature dry distillation (500 - 800 °C), and has characteristics such as high fixed carbon, high specific resistance, high chemical activity, low ash content, low sulfur content, and low phosphorus content. It is mainly used in industries such as smelting, chemical engineering, and chemical fertilizers. In semi-coke production, grading and screening of raw coal is a key link to improve the quality of semi-coke, ensure production efficiency, and equipment safety.

[0003] For the raw coal used in semi-coke production, a drum screening machine is usually used for multi-stage screening. The inside of the drum screening machine is divided into multiple screening structures from the inside to the outside, usually a three-stage screening structure. The first-stage and second-stage screening structures are both composed of screening rods distributed in a circular pattern. The raw materials that do not meet the standards are filtered out through the gaps between adjacent screening rods. The third-stage screening structure is composed of a screen cylinder rolled by a screen mesh, which screens fine particle size particles such as coal powder.

[0004] The above-mentioned screening device for raw coal has the following defects during use: 1) When large particle raw materials pass through the gap between two adjacent screening rods, and with the extrusion and collision between the raw materials, material jamming may occur. Even if some raw materials are jammed, they may fall under the action of gravity with the overall rotation. However, when some raw materials fit tightly enough with the screening rods, it may cause the raw materials to be jammed and unable to fall, resulting in a blockage situation.

[0005] 2) When the raw materials fall onto the inner wall of the screening cylinder, they have a large impact, which may squeeze the originally larger particle size raw materials into the filter hole ports of the screening cylinder, thus causing blockage of the filter holes of the screening cylinder. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a device and method for grading and screening raw coal for semi-coke production to solve the problems mentioned in the above background art.

[0007] To achieve the above object, the embodiments of the present application provide the following technical solutions: The present invention provides a raw coal grading and screening device for semi-coke production, including a base. Above the base, there is a multi-stage screening mechanism for gradually screening raw materials, and a driving mechanism for driving the multi-stage screening mechanism to rotate is jointly arranged between the multi-stage screening mechanism and the base. The multi-stage screening mechanism includes a screening frame for screening large-particle raw materials and a screening cylinder sleeved on the surface of the screening frame for screening fine-particle raw materials. A plurality of swing components are arranged on the screening frame along the circumferential direction of the screening cylinder. The screening frame includes a plurality of first fixed rings coaxial with the screening cylinder, and the plurality of first fixed rings are evenly distributed along the axis direction of the screening cylinder. The outer side of the first fixed ring is coaxially fixedly sleeved with a second fixed ring through a plurality of first fixing plates. The outer side of the second fixed ring is fixedly connected with the inner wall of the screening cylinder through a plurality of second fixing plates. Along the length direction of the inner side of the plurality of first fixed rings, a first screening rod group composed of a plurality of screening rods is jointly and evenly arranged. Along the length direction of the inner side of the plurality of second fixed rings, a second screening rod group composed of a plurality of screening rods two is jointly and evenly arranged. When the screening frame rotates following the screening cylinder, part of the first screening rods and part of the third screening rods are automatically driven to rotate through the swing components.

[0008] According to an advantageous embodiment, the plurality of first screening rods in the first screening rod group are distributed along the circumferential direction of the first fixed ring, and part of the first screening rods are rotatably arranged on the inner side of the first fixed ring through a first rotating sleeve, and the remaining first screening rods are fixedly arranged on the inner side of the first fixed ring and are located between two adjacent rotating first screening rods.

[0009] According to an advantageous embodiment, the plurality of screening rods two in the second screening rod group are evenly distributed along the circumferential direction of the second fixed ring, and part of the screening rods two are rotatably arranged on the inner side of the second fixed ring through a second rotating sleeve, and the remaining screening rods two are fixedly arranged on the inner side of the second fixed ring and are located between two adjacent rotating screening rods two.

[0010] According to an advantageous embodiment, a plurality of arc-shaped sliding holes one are opened on the surface of the first fixed ring along its circumferential direction, and a plurality of arc-shaped sliding holes two are opened on the surface of the second fixed ring along its circumferential direction. The swing components include an arc-shaped swing plate one and a swing plate two. The swing plate one is slidably connected with the arc-shaped sliding holes one at the same position of the plurality of first fixed rings, and the swing plate two is slidably connected with the arc-shaped sliding holes two at the same position of the plurality of second fixed rings. And limiting driving frames are arranged on the front and rear sides of the swing plate one and the corresponding front and rear sides of the swing plate two. The front and rear ends of the rotatable first screening rods and the front and rear ends of the rotatable screening rods two are coaxially fixedly connected with rotating shafts, and driven dial plates are fixedly arranged on the rotating shafts.

[0011] According to an advantageous embodiment, a plurality of guiding balls one are rotatably arranged on the inner concave side wall and the outer convex side wall of the swing plate one located inside the arc-shaped sliding hole one, and the plurality of guiding balls one are evenly distributed along the arc direction of the swing plate one.

[0012] According to a favorable embodiment, a plurality of guide balls are rotatably arranged on the inner concave side wall and the outer convex side wall of the swing plate 2 located inside the arc-shaped sliding hole 2, and the plurality of guide balls are evenly distributed along the arc direction of the swing plate 2.

[0013] According to a favorable embodiment, the limit driving frame includes two arc-shaped limit plates, the two arc-shaped limit plates are fixedly connected by two fixed plates three, and the same side of the swing plate one and the swing plate two are respectively fixedly connected to the corresponding arc-shaped limit plates, and a plurality of active paddle plates are fixedly arranged on the inner concave surface of the arc-shaped limit plate, and the driven paddle plate is movably arranged between two adjacent active paddle plates.

[0014] According to an advantageous embodiment, a material cutting plate is fixedly provided on the outer convex surface of the second swing plate between adjacent second fixing rings.

[0015] According to a favorable embodiment, the driving mechanism includes two transmission shafts, which are rotatably arranged on the left and right sides of the base through ear seats, and driving wheels are fixedly arranged at the front and rear ends of the transmission shafts, and annular guide rails are fixedly arranged at the front and rear ends of the screening drum. The driving wheels are rollingly connected to the corresponding annular guide rails, and the same ends of the two transmission shafts are connected through a pulley group. A driving motor is fixedly arranged on the base, and the output shaft of the driving motor is connected to any one of the transmission shafts.

[0016] In addition, the present scheme also provides a method for grading and screening raw coal for lignite production, which is performed using the above-mentioned raw coal grading and screening device for lignite production, and includes the following steps: S1, loading, feeding the raw materials from the front end of the screening cylinder into the screening frame through an external loading device.

[0017] S2. Screening: The driving mechanism drives the screening drum and the screening frame to rotate to perform multi-stage screening of the raw materials.

[0018] S3, discharging, the screened raw materials are discharged from different discharging ports of the screening frame and the screening drum and collected by external collecting equipment.

[0019] Compared with the prior art, a raw coal grading and screening device and method for lignite production provided in an embodiment of the present invention has the following beneficial effects: 1. In the present invention, by designing self-rotating screening rod one and screening rod two in screening rod group one and screening rod group two, and combining the linkage of the active paddle plate in the swing assembly with the corresponding driven paddle plate in screening rod one and screening rod two, the screening rod one and screening rod two are driven to rotate actively during the screening process, breaking the stuck state of the raw materials, significantly reducing the risk of material jamming caused by extrusion in the gap between two adjacent screening rods one or two adjacent screening rods two, and improving the screening continuity.

[0020] 2. In the present invention, during the rotation of the screening cylinder, the swinging assembly slides through the first arc-shaped sliding hole and the second arc-shaped sliding hole. The first swinging plate and the second swinging plate in the swinging assembly both collide with the first fixed ring and the second fixed ring to generate periodic vibrations, which are evenly transmitted to the upper half of the screening cylinder, prompting the raw materials blocked in the filter holes to fall off. At the same time, when the material blocking plate rotates and rises with the second swinging plate, the raw materials at the bottom are evenly spread out to avoid local accumulation, and the double mechanism ensures the smoothness of the filter holes.

[0021] 3. In the present invention, during the rotation process, the material blocking plate intercepts the raw materials at the bottom of the screening cylinder and drives them to rise, so that the raw materials flow out evenly from the gap between the material blocking plate and the inner wall of the screening cylinder, improving the distribution state of the raw materials, reducing the excessive accumulation of fine particles at the bottom, and accelerating the three-stage screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the external three-dimensional structure diagram of the present invention.

[0023] Figure 2 is the partial three-dimensional structure diagram at the front side position of the present invention.

[0024] Figure 3 is the partial front view plan diagram of the multi-stage screening mechanism in the present invention.

[0025] Figure 4 is the side view sectional three-dimensional structure diagram of the present invention.

[0026] Figure 5 is the front view sectional plane structure diagram of the present invention.

[0027] Figure 6 is the external three-dimensional structure diagram of the first fixed ring and the second fixed ring in the present invention.

[0028] Figure 7 is the external three-dimensional structure diagram of the swinging assembly in the present invention.

[0029] Reference numerals in the drawings: 1. Base; 2. Multi-stage screening mechanism; 21. Screening frame; 211. First fixed ring; 212. Second fixed ring; 213. First group of screening rods; 214. Second group of screening rods; 22. Screening cylinder; 23. Swinging assembly; 231. First swinging plate; 232. Second swinging plate; 233. Limit driving frame; 2331. Arc-shaped limit plate; 2332. Active dialing plate; 234. Rotating shaft; 235. Driven dialing plate; 236. Material blocking plate; 3. Driving mechanism; 31. Transmission shaft; 32. Driving wheel; 33. Ring-shaped guide rail; 34. Driving motor; 4. First arc-shaped sliding hole; 5. Second arc-shaped sliding hole; 6. First guiding ball; 7. Second guiding ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following is combined with the attached Figure 1 - attached Figure 7Further detailed description of this application is provided below.

[0031] Please refer to Figure 1 and Figure 2 , a raw coal grading and screening device for semi-coke production, specifically used for screening raw materials before semi-coke processing. It includes a base 1, and the base 1 is in an inclined state with the front higher than the rear. Above the base 1, there is a multi-stage screening mechanism 2 for gradually screening raw materials. A driving mechanism 3 for driving the multi-stage screening mechanism 2 to rotate is jointly arranged between the multi-stage screening mechanism 2 and the base 1. The multi-stage screening mechanism 2 includes a screening frame 21 and a screening cylinder 22 sleeved on the surface of the screening frame 21. By driving the screening cylinder 22 and the screening frame 21 to rotate simultaneously through the driving mechanism 3, the raw materials are subjected to primary and secondary screening through the screening frame 21. After the raw materials with larger particle sizes are subjected to secondary screening, the raw materials with smaller particle sizes are then screened by the screening cylinder 22 and discharged outside the screening cylinder 22.

[0032] Refer to Figure 1 and Figure 2 , the driving mechanism 3 includes two transmission shafts 31. The two transmission shafts 31 are respectively rotatably arranged on the left and right sides of the base 1 through ear seats, and driving wheels 32 are fixedly arranged at both the front and rear ends of the transmission shafts 31. Ring-shaped guide rails 33 are fixedly arranged at both the front and rear ends of the screening cylinder 22, and the driving wheels 32 are in rolling connection with the corresponding ring-shaped guide rails 33. The same ends of the two transmission shafts 31 are jointly connected by a belt pulley group. A driving motor 34 is fixedly arranged on the base 1, and the output shaft of the driving motor 34 is connected to any one of the transmission shafts 31. By driving the two transmission shafts 31 to rotate through the driving motor 34, the driving wheels 32 drive the screening cylinder 22 to rotate through the ring-shaped guide rails 33 to screen the raw materials. The surface of the driving wheel 32 is made of rubber material, and when it contacts the outer wall of the ring-shaped guide rail 33, it drives the screening cylinder 22 to rotate synchronously through a large frictional force.

[0033] Refer to Figure 2 , Figure 4 and Figure 5 , the screening frame 21 includes a plurality of fixing rings one 211 coaxial with the screening cylinder 22. The plurality of fixing rings one 211 are evenly distributed along the axis direction of the screening cylinder 22. A fixing ring two 212 is coaxially and fixedly sleeved on the outside of the fixing ring one 211 through a plurality of fixing plates one. The outside of the fixing ring two 212 is fixedly connected to the inner wall of the screening cylinder 22 through a plurality of fixing plates two. A screening rod group one 213 composed of a plurality of screening rods is uniformly arranged along the length direction on the inner side of the plurality of fixing rings one 211. A screening rod group two 214 composed of a plurality of screening rods two is uniformly arranged along the length direction on the inner side of the plurality of fixing rings two 212. The screening rod group one 213 conducts primary screening on the raw materials, and the screening rod group two 214 conducts secondary screening on the raw materials.

[0034] Refer to Figure 4 andFigure 5 Among them, a plurality of first screening rods in the first screening rod group 213 are distributed along the circumferential direction of the first fixed ring 211, and some of the first screening rods are rotatably arranged inside the first fixed ring 211 through the first rotating sleeve, and the remaining first screening rods are fixedly arranged inside the first fixed ring 211 and are located between two adjacent rotating first screening rods. After the raw material enters the inside of the screening frame 21, it is first screened through the first layer of sieve holes (the gaps formed between two adjacent first screening rods) composed of a plurality of first screening rods. Among them, some of the first screening rods can rotate, so that when screening raw materials with large particle sizes, compared with the traditional way where the first screening rods are completely fixed, the first screening rods can passively rotate slightly as a whole rotates, thereby reducing the risk of the raw material getting stuck between two first screening rods.

[0035] Refer to Figure 4 and Figure 5 Among them, a plurality of second screening rods in the second screening rod group 214 are evenly distributed along the circumferential direction of the second fixed ring 212, and some of the second screening rods are rotatably arranged inside the second fixed ring 212 through the second rotating sleeve, and the remaining second screening rods are fixedly arranged inside the second fixed ring 212 and are located between two adjacent rotating second screening rods. After the raw material is subjected to primary screening by the first screening rod group 213, it is then subjected to secondary screening through the second layer of sieve holes (the gaps formed between two adjacent second screening rods) composed of a plurality of second screening rods. Similarly, some of the second screening rods can rotate, and compared with the traditional way where the second screening rods are completely fixed, the second screening rods can passively rotate slightly when the whole rotates, thereby reducing the risk of the raw material getting stuck between two second screening rods.

[0036] Refer to Figures 2 - 7 As shown in, a plurality of swing assemblies 23 are arranged on the screening frame 21 along the circumferential direction of the screening cylinder 22. A plurality of arc-shaped sliding holes 4 are formed on the surface of the first fixed ring 211 along its circumferential direction, and a plurality of arc-shaped sliding holes 5 are formed on the surface of the second fixed ring 212 along its circumferential direction. The swing assembly 23 includes an arc-shaped first swing plate 231 and a second swing plate 232. The first swing plate 231 is slidably connected to the arc-shaped sliding holes 4 at the same position of a plurality of first fixed rings 211, and the second swing plate 232 is slidably connected to the arc-shaped sliding holes 5 at the same position of a plurality of second fixed rings 212. Limiting drive frames 233 are arranged on the front and rear sides of the first swing plate 231 and the corresponding front and rear sides of the second swing plate 232. The front and rear ends of the rotatable first screening rods and the front and rear ends of the rotatable second screening rods are coaxially and fixedly connected with rotating shafts 234, and driven dial plates 235 are fixedly arranged on the rotating shafts 234.

[0037] During specific operation, when the screening frame 21 rotates following the screening cylinder 22, it drives the swing assembly 23 to rotate, causing the swing assembly 23 to continuously rotate and change positions. As a result, the swing plate one 231 in the swing assembly 23 slides back and forth in the arc-shaped slide hole one 4, and the swing plate two 232 slides back and forth in the arc-shaped slide hole two 5. Consequently, the front and rear limiting drive frames 233 slide relative to the fixed ring one 211 and the fixed ring two 212. The sliding of the limiting drive frame 233 actively drives the driven dial 235 to swing and drives the corresponding screening rod one or screening rod two to rotate actively through the corresponding rotating shaft 234. Thus, even if there is material jamming between adjacent screening rod one or adjacent screening rod two, as the screening rod one or screening rod two at the corresponding position rotates, the raw materials at that position will automatically fall off.

[0038] Furthermore, when the swing plate one 231 and the swing plate two 232 move to the high position, they will collide with the inner sides of the corresponding arc-shaped slide hole one 4 and arc-shaped slide hole two 5 while sliding, causing the fixed ring one 211 and the fixed ring two 212 at each section position of the screening cylinder 22 to vibrate. The vibration can be evenly transmitted to each area near the upper half of the screening cylinder 22, promoting the dredging of the blocked filter holes in the upper half of the screening cylinder 22.

[0039] Refer to Figure 4 、 Figure 6 and Figure 7 As shown in

[0040] Refer to Figure 3 、 Figure 7, the limiting drive frame 233 includes two arc-shaped limiting plates 2331. The two arc-shaped limiting plates 2331 are fixedly connected by two fixing plates III. The same sides of the first swing plate 231 and the second swing plate 232 are respectively fixedly connected to the corresponding arc-shaped limiting plates 2331. A plurality of active dial plates 2332 are fixedly arranged on the concave surface of the arc-shaped limiting plate 2331. The driven dial plate 235 is movably arranged between two adjacent active dial plates 2332. When the first swing plate 231 and the second swing plate 232 slide, the limiting drive frame 233 will slide synchronously, so that the two active dial plates 2332 can continuously contact the corresponding driven dial plates 235, further causing the driven dial plates 235 to swing, and then driving the corresponding first screening rod or the second screening rod to rotate actively.

[0041] Refer to Figure 4 and Figure 5 , on the convex surface of the second swing plate 232, a material intercepting plate 236 is fixedly arranged between adjacent second fixing rings 212. The gap between the side of the material intercepting plate 236 away from the center of the screening cylinder 22 and the inner wall of the screening cylinder 22 is 3 cm. The material intercepting plate 236 can rotate together with the screening frame 21. The lowermost material intercepting plate 236 will intercept the raw materials accumulated at the bottom inside the screening cylinder 22 and drive them to rotate and rise together. As the material intercepting plate 236 continuously rotates and rises, the intercepted raw materials will gradually flow out from the gap between the material intercepting plate 236 and the inner wall of the screening cylinder 22, playing a role in evenly distributing the raw materials at the lower side inside the screening cylinder 22, which helps the fine-particle-size raw materials at the lower side inside the screening cylinder 22 to be quickly screened and discharged by the screening cylinder 22.

[0042] In addition, this solution also provides a method for classifying and screening raw coal for semi-coke production, which is completed by the above-mentioned classification and screening device, including the following steps: S1. Feeding, the raw materials are fed into the screening frame 21 from the front end of the screening cylinder 22 through an external feeding device.

[0043] S2. Screening, the driving mechanism 3 drives the screening cylinder 22 and the screening frame 21 to rotate.

[0044] 1) The raw materials first enter the screening space composed of a plurality of first screening rods. As the first screening rods continuously rotate, most of the raw materials are filtered out from the gaps between adjacent first screening rods, and a small part of the raw materials move along the length direction of the first screening rods from the feed port to the discharge port.

[0045] 2) The raw materials screened by the first screening rod are further subjected to secondary filtration by the second screening rod. The filtered raw materials fall into the screening cylinder 22 for tertiary filtration. The fine raw materials in the raw materials are filtered out by the screening cylinder 22. As the screening cylinder 22 rotates, the raw materials in each area gradually move from the discharging position towards the corresponding discharging positions. At the same time, the first swing plate 231 and the second swing plate 232 will slide relative to the first fixed ring 211 and the second fixed ring 212 as the screening cylinder 22 moves. The sliding of the first swing plate 231 and the second swing plate 232 will randomly knock on the first fixed ring 211 and the second fixed ring 212. The vibration generated by the knocking can promote the discharge of the raw materials that may block the filter holes on the surface of the outer screening cylinder 22. At the same time, it will also cause some of the first screening rods and some of the second screening rods to rotate automatically, avoiding the jamming of materials between two adjacent first screening rods or two adjacent second screening rods.

[0046] S3. Discharging. The screened raw materials are discharged from different discharging ports of the screening frame 21 and the screening cylinder 22 and collected by an external collecting device.

[0047] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A raw coal grading and screening device for semi-coke production, including a base, characterized in that: Above the base, a multi-stage screening mechanism for gradually screening raw materials is provided, and a driving mechanism for driving the multi-stage screening mechanism to rotate is jointly provided between the multi-stage screening mechanism and the base; The multi-stage screening mechanism includes a screening frame for screening large-particle raw materials and a screening cylinder sleeved on the surface of the screening frame for screening fine-particle raw materials. A plurality of swing components are arranged on the screening frame along the circumferential direction of the screening cylinder; The screening frame includes a plurality of first fixed rings coaxial with the screening cylinder. The plurality of first fixed rings are evenly distributed along the axis direction of the screening cylinder. A second fixed ring is coaxially and fixedly sleeved on the outer side of the first fixed ring through a plurality of first fixing plates. The outer side of the second fixed ring is fixedly connected to the inner wall of the screening cylinder through a plurality of second fixing plates. A first screening rod group composed of a plurality of screening rods is jointly and evenly arranged along the length direction on the inner side of the plurality of first fixed rings. A second screening rod group composed of a plurality of second screening rods is jointly and evenly arranged along the length direction on the inner side of the plurality of second fixed rings; When the screening frame rotates following the screening cylinder, part of the first screening rods and part of the third screening rods are automatically driven to rotate through the swing components.

2. The raw coal grading and screening device for semi-coke production according to claim 1, wherein, A plurality of the first screening rods in the first screening rod group are distributed along the circumferential direction of the first fixed ring, and part of the first screening rods are rotatably arranged on the inner side of the first fixed ring through a first rotating sleeve, and the remaining first screening rods are fixedly arranged on the inner side of the first fixed ring and are located between two adjacent rotating first screening rods.

3. The raw coal grading and screening device for semi-coke production according to claim 1, characterized in that, A plurality of the second screening rods in the second screening rod group are evenly distributed along the circumferential direction of the second fixed ring, and part of the second screening rods are rotatably arranged on the inner side of the second fixed ring through a second rotating sleeve, and the remaining second screening rods are fixedly arranged on the inner side of the second fixed ring and are located between two adjacent rotating second screening rods.

4. A raw coal grading and screening device for semi-coke production according to claim 1, characterized in that, A plurality of first arc-shaped sliding holes are formed in the surface of the first fixed ring along its circumferential direction. A plurality of second arc-shaped sliding holes are formed in the surface of the second fixed ring along its circumferential direction. The swing components include an arc-shaped first swing plate and a second swing plate. The first swing plate is slidably connected to the first arc-shaped sliding holes at the same positions of the plurality of first fixed rings. The second swing plate is slidably connected to the second arc-shaped sliding holes at the same positions of the plurality of second fixed rings. Limiting driving frames are arranged on the front and rear sides of the first swing plate and the corresponding front and rear sides of the second swing plate. The front and rear ends of the rotatable first screening rods and the front and rear ends of the rotatable second screening rods are coaxially and fixedly connected with rotating shafts, and driven dial plates are fixedly arranged on the rotating shafts.

5. The raw coal grading and screening device for semi-coke production according to claim 4, wherein A plurality of first guiding balls are rotatably arranged on the inner concave side wall and the outer convex side wall of the first swing plate located inside the first arc-shaped sliding hole. The plurality of first guiding balls are evenly distributed along the arc direction of the first swing plate.

6. The raw coal grading and screening device for semi-coke production according to claim 4, characterized in that, A plurality of second guiding balls are rotatably arranged on the inner concave side wall and the outer convex side wall of the second swing plate located inside the second arc-shaped sliding hole. The plurality of second guiding balls are evenly distributed along the arc direction of the second swing plate.

7. A raw coal grading and screening device for semi-coke production according to claim 4, characterized in that The limiting driving frame includes two arc-shaped limiting plates, and the two arc-shaped limiting plates are fixedly connected through two third fixing plates. The first swing plate and the second swing plate are respectively fixedly connected to the corresponding arc-shaped limiting plates on the same side. A plurality of driving dial plates are fixedly arranged on the inner concave surface of the arc-shaped limiting plate. The driven dial plate is movably arranged between two adjacent driving dial plates.

8. A raw coal grading and screening device for semi-coke production according to claim 4, characterized in that, The outer convex surface of the swing plate 2 is fixedly provided with a material cutting plate between adjacent fixing rings 2.

9. The raw coal grading and screening device for semi-coke production according to claim 1, characterized in that, The driving mechanism includes two transmission shafts, which are rotatably arranged on the left and right sides of the base through ear seats, and driving wheels are fixedly arranged on the front and rear ends of the transmission shafts. Annular guide rails are fixedly arranged on the front and rear ends of the screening drum. The driving wheels are rollingly connected to the corresponding annular guide rails. The same ends of the two transmission shafts are connected through a pulley group. A driving motor is fixedly arranged on the base, and the output shaft of the driving motor is connected to any one of the transmission shafts.

10. A method for grading and screening raw coal used in semi-coke production, characterized in that, The process is performed using the raw coal grading and screening device for producing blue carbon as claimed in claim 1, comprising the following steps: S1, feeding, feeding the raw materials from the front end of the screening cylinder into the screening frame through an external feeding device; S2, screening, the driving mechanism drives the screening drum and the screening frame to rotate to perform multi-stage screening of the raw materials; S3, discharging, the screened raw materials are discharged from different discharging ports of the screening frame and the screening drum and collected by external collecting equipment.

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