Fly ash modification device with drying and screening functions
By designing a fly ash modification device with drying and screening function, using hot air drying, press plate extrusion and power screening, the agglomeration problem caused by uneven drying of fly ash is solved, and uniform drying and screening of fly ash is achieved, and processing efficiency is improved.
Patent Information
- Application Number
- CN202510078560.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-04-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Fly ash has uneven drying during the drying process, resulting in stress forming inside the material and agglomeration, affecting subsequent processing and preparation.
A fly ash modification device with dry screening function is designed, including a preparation cylinder with a top opening, a drying chamber, a press plate and a power screen assembly. Through hot air drying, plate extrusion and power screening, uniform drying and screening of fly ash can be achieved to avoid agglomeration.
It effectively solves the agglomeration problem caused by uneven drying of fly ash, ensures the drying degree of fly ash and the smooth progress of subsequent processing, and improves the efficiency of fly ash modification.
Smart Images
Figure CN119803010A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of coal fly ash processing and preparation, in particular to a coal fly ash modification device with drying and screening functions. Background Art
[0002] Fly ash is the fine ash collected from the flue gas after coal combustion. It is the main solid waste discharged from coal-fired power plants. Fly ash looks similar to cement, and its color varies from milky white to gray-black. With the development of the electric power industry, the fly ash emissions from coal-fired power plants have increased year by year, becoming one of the largest industrial waste residues in my country.
[0003] If a large amount of fly ash is not treated, it will produce dust and pollute the atmosphere; if it is discharged into the water system, it will cause river siltation, and the toxic chemicals in it will also cause harm to humans and organisms.
[0004] Therefore, in order to realize the resource utilization of fly ash, such as as an admixture for concrete, a series of processing and production of fly ash is required. Among them, since the fly ash raw materials may contain a certain amount of moisture and some substances that do not meet the standards in size and quality will remain in the fly ash raw materials during the combustion process, which will affect its subsequent processing and use effect. Therefore, it is usually necessary to use equipment to dry and screen the fly ash to reduce its moisture content and impurities, improve the actual use effect of the fly ash, and facilitate the smooth progress of subsequent processing.
[0005] However, during the drying process of fly ash, the moisture in the fly ash evaporates unevenly. The moisture in some areas evaporates faster, while the moisture in other areas remains high. This may cause stress to form inside the material, resulting in agglomeration and affecting the subsequent processing of the fly ash. Summary of the invention
[0006] In order to solve the above technical problems, the present invention provides a fly ash modification device with drying and screening functions to solve the problem of uneven drying of fly ash in the drying process in the prior art, thereby causing agglomeration and affecting the subsequent processing and preparation of fly ash.
[0007] A fly ash modification device with drying and screening functions, comprising a preparation cylinder with an opening at the top, a top cover provided on the preparation cylinder, a feed port provided on the top cover, a hot air blower with an external power supply installed on the feed port, a carrying plate for carrying the fly ash provided inside the preparation cylinder, a drying chamber formed between the carrying plate and the top cover;
[0008] It also includes a pressing plate, which is located in the drying chamber. The pressing plate is provided with a circle of annularly distributed perforations. The top of the pressing plate is symmetrically provided with connecting rods connected to the top cover. The top of the top cover is symmetrically provided with mounting plates. A rotatably connected wire drum is provided between the two mounting plates. Two cables are wound on the wire drum. The other ends of the cables pass through the top cover and are fixedly connected to the supporting disk.
[0009] Preferably, the preparation cylinder consists of two upper and lower cylinders, the diameter of the upper cylinder is smaller than the diameter of the lower cylinder, the preparation cylinder is symmetrically provided with air outlets near the top cover, a motor is provided on one side of the mounting plate, and the output shaft of the motor is connected to the wire drum.
[0010] Preferably, a screening plate is provided in the lower cylinder body of the preparation cylinder, and a circle of annularly distributed screening meshes are provided on the screening plate, a screening chamber is formed between the screening plate and the supporting plate, a modification chamber is formed between the screening plate and the bottom plate of the preparation cylinder, and a power screening assembly is provided outside the preparation cylinder, and the power screening assembly is connected to the screening plate.
[0011] Preferably, the power screening assembly includes a power wheel, a cam and a linkage shaft, the cam is symmetrically arranged on the outside of the preparation cylinder, a positioning plate is provided on the side of the cam away from the preparation cylinder, a second motor is provided on the positioning plate, the output shaft of the second motor is connected to the cam, and the power wheel is rotatably connected to the top of the cam and cooperates with it.
[0012] Preferably, movable holes are symmetrically provided on the preparation cylinder, the linkage shaft is movably arranged in the movable hole, one end of the linkage shaft is fixedly connected to the power wheel, and the other end is rotatably connected to the side wall of the screening plate, an embedded sponge elastic layer is provided in the movable hole, and the sponge elastic layer is movably fitted with the linkage shaft.
[0013] Preferably, a support column is symmetrically provided on the top of the screening plate, and an annular groove is provided on the inner wall of the preparation cylinder, wherein the annular groove is in the screening chamber, and an annular push plate is provided in the annular groove, and the side wall of the annular push plate is flush with the side wall of the preparation cylinder, and a push rod is provided on the other side of the annular push plate, and the push rod passes through the preparation cylinder and extends to the outside, and when the supporting plate descends to the top of the support column, the bottom of the annular push plate is flush with the top surface of the supporting plate.
[0014] Preferably, the preparation cylinder is symmetrically provided with a limiting plate on the top of the large cylinder, the limiting plate is movably connected to the preparation cylinder, and the inner wall of the limiting plate is flush with the inside of the preparation cylinder.
[0015] Preferably, the preparation cylinder is provided with a modification feed port, the modification feed port is located in the modification chamber, the modification feed port is provided with a sealing plug, the bottom plate of the preparation cylinder is provided with a discharge port, and the discharge port is provided with a discharge plug to seal it.
[0016] Preferably, a motor three is provided at the bottom of the bottom plate of the preparation cylinder, a rotating shaft is provided through the center of the bottom plate of the preparation cylinder, a ring-shaped stirring plate is provided on the rotating shaft, the stirring plate is located in the modification chamber, and the output shaft of the motor three is connected to the rotating shaft.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] 1. The present invention sets a drying chamber inside the preparation cylinder. When the fly ash is placed on the supporting plate through the feed port, a hot air blower is installed on the feed port to heat and dry the fly ash below. When agglomeration occurs, the motor 1 is started to drive the wire drum to rotate, so that the supporting plate moves up and contacts the pressing plate, so as to squeeze the agglomerated fly ash and crush it. There are perforations on the pressing plate. When encountering agglomerates of different sizes, after the large agglomerates are compressed, the fly ash will pass through the perforations and be blown into the drying chamber again by the hot air blower, so that all the agglomerates can be crushed, thereby ensuring the dryness of the fly ash and will not affect its subsequent processing.
[0019] 2. The present invention sets a screening chamber and a modification chamber below the drying chamber. When the fly ash is dried, it descends to the top of the support column. The fly ash on the carrier plate is pushed onto the screening plate by pushing the annular push plate. The fly ash that meets the standards can be screened into the modification chamber below through the power screening component. A modifier is added to the modification chamber, and the modifier is physically reacted with the fly ash to achieve the modification of the fly ash. The drying, screening and modification of the fly ash can be achieved in one preparation cylinder. Moreover, the chambers do not interfere with each other during operation and can operate independently of each other, thereby improving the preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the components of the overall fly ash modification device of the present invention;
[0021] Figure 2 This is a schematic diagram of the disassembly of the overall structure of the internal parts of the preparation tube of the present invention;
[0022] Figure 3 This is a schematic diagram of the structure of the components of the present invention when the carrier plate is placed on the top of the support column;
[0023] Figure 4 This is a schematic diagram of the structure of the components of the present invention in which the limiting plate is closed to the carrier plate;
[0024] Figure 5 This is a schematic diagram of the structure of the cylinder and the top cover components of the present invention;
[0025] Figure 6 This is a schematic diagram of the structure of the interior of the cylinder and the annular push plate components prepared in the present invention.
[0026] In the figure:
[0027] 1. Preparation cylinder; 2. Top cover; 3. Feed inlet; 4. Hot air blower; 5. Carrying plate; 6. Drying chamber; 7. Pressing plate; 8. Perforation; 9. Connecting rod; 10. Mounting plate; 11. Wire drum; 12. Cable; 13. Air outlet; 14. Motor 1; 15. Screening plate; 16. Screening mesh; 17. Screening chamber; 18. Modification chamber; 19. Power wheel; 20. Cam; 21. Linkage shaft; 22. Positioning plate; 23. Motor 2; 24. Movable hole; 25. Sponge elastic layer; 26. Support column; 27. Annular groove; 28. Annular push plate; 29. Push rod; 30. Limiting plate; 31. Modification feed inlet; 32. Sealing plug; 33. Discharge port; 34. Discharge plug; 35. Motor 3; 36. Rotating shaft; 37. Stirring plate. DETAILED DESCRIPTION
[0028] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.
[0029] As attached Figure 1 To Attachment Figure 6 As shown:
[0030] Embodiment 1: The present invention provides a fly ash modification device with drying and screening functions, comprising a preparation cylinder 1 with an opening at the top, a top cover 2 provided on the preparation cylinder 1, a feed port 3 provided on the top cover 2, a hot air blower 4 with an external power supply installed on the feed port 3, a carrying plate 5 for carrying the fly ash provided inside the preparation cylinder 1, a drying chamber 6 formed between the carrying plate 5 and the top cover 2;
[0031] The drying chamber 6 further comprises a pressing plate 7, which is located in the drying chamber 6. The pressing plate 7 is provided with a circle of annularly distributed perforations 8. The top of the pressing plate 7 is symmetrically provided with connecting rods 9 connected to the top cover 2. The top of the top cover 2 is symmetrically provided with mounting plates 10. A rotatably connected wire drum 11 is provided between the two mounting plates 10. Two cables 12 are wound around the wire drum 11. The other ends of the cables 12 pass through the top cover 2 and are fixedly connected to the supporting disk 5.
[0032] It should be noted that, by arranging a drying chamber 6 inside the preparation cylinder 1, when the fly ash is placed on the supporting plate 5 through the feed port 3, a hot air blower 4 is installed on the feed port 3 to heat and dry the fly ash below. When agglomeration occurs, the motor 14 is started to drive the wire drum 11 to rotate, so that the supporting plate 5 moves up and contacts the pressing plate 7, so as to squeeze the agglomerated fly ash and crush it. There are perforations 8 on the pressing plate 7. When encountering agglomerates of different sizes, the large agglomerates are compressed, and the fly ash will pass through the perforations 8 and be blown into the drying chamber 6 again by the hot air blower 4, so that all the agglomerates can be crushed, thereby ensuring the degree of dryness of the fly ash and will not affect its subsequent processing.
[0033] In this embodiment, the preparation cylinder 1 is composed of two upper and lower cylinders, the diameter of the upper cylinder is smaller than the diameter of the lower cylinder, and the preparation cylinder 1 is symmetrically provided with an air outlet 13 near the top cover 2. A motor 14 is provided on one side of the mounting plate 10, and the output shaft of the motor 14 is connected to the wire drum 11.
[0034] It should be noted that, by designing the preparation cylinder 1 into two cylinders, the diameter of the upper cylinder is small, and the supporting plate 5 cooperates with the inner wall of the upper cylinder. When the supporting plate 5 is located in the upper cylinder, the fly ash will all fall on the supporting plate 5 after being placed in the drying chamber 6 through the feed port 3, and will not fall into the screening chamber 17 below. At the same time, after the supporting plate 5 descends to the lower cylinder, a gap will be formed with the inside of the lower cylinder, so that the dried fly ash will fall on the screening plate 15, so that subsequent screening processing can be carried out.
[0035] In this embodiment, a screening plate 15 is provided in the lower cylinder body of the preparation cylinder 1, and a circle of annularly distributed screening meshes 16 are provided on the screening plate 15. A screening chamber 17 is formed between the screening plate 15 and the supporting plate 5, and a modification chamber 18 is formed between the screening plate 15 and the bottom plate of the preparation cylinder 1. A power screening assembly is provided on the outside of the preparation cylinder 1, and the power screening assembly is connected to the screening plate 15.
[0036] It should be noted that the apertures of the screening meshes 16 are consistent, so that large particles of impurities can be retained on the screening plate 15, thereby screening the dried fly ash and allowing it to fall into the modification chamber 18 for subsequent modification.
[0037] In this embodiment, the power screening assembly includes a power wheel 19, a cam 20 and a linkage shaft 21. The cam 20 is symmetrically arranged on the outside of the preparation cylinder 1. A positioning plate 22 is provided on the side of the cam 20 away from the preparation cylinder 1. A motor 23 is provided on the positioning plate 22. The output shaft of the motor 23 is connected to the cam 20. The power wheel 19 is rotatably connected to the top of the cam 20 and cooperates with it.
[0038] It should be noted that, through the power screening assembly, the positions of the two cams 20 are synchronized. Therefore, after the motor 23 is started, due to the shape of the cam 20, when cooperating with the power wheel 19, it will drive the power wheel 19 to move up and down. The linkage shaft 21 on the power wheel 19 is connected to the screening plate 15, so that when the cam 20 rotates, it can drive the screen to vibrate up and down, thereby vibrating and screening the dried fly ash, realizing automatic screening.
[0039] In this embodiment, a movable hole 24 is symmetrically provided on the preparation cylinder 1, and the linkage shaft 21 is movably arranged in the movable hole 24. One end of the linkage shaft 21 is fixedly connected to the power wheel 19, and the other end is rotatably connected to the side wall of the screening plate 15. An embedded sponge elastic layer 25 is provided in the movable hole 24, and the sponge elastic layer 25 is movably fitted with the linkage shaft 21.
[0040] It should be noted that the movable hole 24 provided can link the shaft 21 to achieve up and down displacement in the movable hole 24, providing a travel space for the shaft 21 to move. The sponge elastic layer 25 is distributed up and down in a movable hole 24 and has a certain elasticity. When the linkage shaft 21 moves upward, the upper sponge elastic layer 25 will be compressed, and at the same time, the lower sponge elastic layer 25 will stretch, so that even when the linkage shaft 21 is in motion, the sponge elastic layer 25 can also close the movable hole 24, thereby avoiding the leakage of fly ash from the movable hole 24 during the fly ash screening process.
[0041] In this embodiment, a support column 26 is symmetrically provided on the top of the screening plate 15, and an annular groove 27 is provided on the inner wall of the preparation cylinder 1. The annular groove 27 is inside the screening chamber 17, and an annular push plate 28 is inside the annular groove 27. The side wall of the annular push plate 28 is flush with the side wall of the preparation cylinder 1, and a push rod 29 is provided on the other side of the annular push plate 28. The push rod 29 passes through the preparation cylinder 1 and extends to the outside. When the supporting plate descends to the top of the support column 26, the bottom of the annular push plate 28 is flush with the top surface of the supporting plate 5.
[0042] It should be noted that the support column 26 is fixedly connected to the top of the screening plate 15. After the fly ash is dried, the carrying plate 5 descends into the screening chamber 17. Most of the fly ash will fall on the screening plate 15, and some will remain on the carrying plate 5. A pushing annular push plate 28 is provided. The bottom of the annular push plate 28 is flush with the top surface of the carrying plate 5. The annular push plate 28 can be pushed to push the fly ash on the carrying plate 5 onto the screening plate 15, so that all the dried fly ash can enter the screening chamber 17.
[0043] In this embodiment, a limiting plate 30 is symmetrically provided on the top of the preparation cylinder 1 located on the large cylinder. The limiting plate 30 is movably connected to the preparation cylinder 1 , and the inner wall of the limiting plate 30 is flush with the inside of the preparation cylinder 1 .
[0044] It should be noted that, through the setting of the limit plate 30, when all the fly ash on the carrying plate 5 is pushed into the carrying plate 5, the limit plate 30 is pushed toward the inside of the preparation cylinder 1, so that after the carrying plate 5 is completely entered into the small cylinder of the upper layer, it is blocked by the limit plate 30 and will not rise anymore. On the one hand, the sealing of the screening chamber 17 is ensured. During the fly ash screening process, the vibrating fly ash will be blocked by the carrying plate 5 when floating upwards and will not enter the drying chamber 6 and the hot air blower 4.
[0045] In this embodiment, a modified feed port 31 is provided on the preparation cylinder 1, and the modified feed port 31 is located in the modified chamber 18. A sealing plug 32 is provided on the modified feed port 31. A discharge port 33 is provided on the bottom plate of the preparation cylinder 1, and a discharge plug 34 is provided on the discharge port 33 to seal it.
[0046] It should be noted that, after the pulverized coal is screened out, the sealing plug 32 on the modified feed port 31 is opened, so that the modifier can be put into the modified chamber 18. The modifier can be lime or gypsum. After being put in, it is mixed and stirred with the fly ash, and the fly ash can also be ground to refine the particles and evenly disperse them, thereby increasing its specific surface area and activity.
[0047] In this embodiment, a motor three 35 is provided at the bottom of the bottom plate of the preparation cylinder 1, and a penetrating rotating shaft 36 is provided at the center position of the bottom plate of the preparation cylinder 1. A ring-shaped stirring plate 37 is provided on the rotating shaft 36. The stirring plate 37 is located in the modification chamber 18, and the output shaft of the motor three 35 is connected to the rotating shaft 36.
[0048] It should be noted that by arranging a rotating stirring plate 37 inside the preparation cylinder 1, the stirring plate 37 can make the fly ash and the modifier better blend, and can also grind the fly ash to a certain extent, so that the modifier can react better with the fly ash and realize the modification of the fly ash.
[0049] The method of using the above embodiment is that when it is necessary to prepare fly ash, a top cover 2 is installed on the top of the preparation cylinder 1, and a feeding port 3 is provided on the top cover 2. The fly ash is put in and falls onto the supporting plate 5 in the drying chamber 6. The hot air blower 4 is installed on the feeding port 3 so that the hot air is directed to the drying chamber 6. The hot air blower 4 is started to dry the fly ash inside. During the drying process, the generated steam will be discharged to the outside through the air outlet. When the fly ash clumps, the motor 14 is started. The motor 14 drives the two cables 12 on the wire drum 11 to be reeled synchronously, and the supporting plate 5 rises in the drying chamber 6. When it moves to fit with the pressing plate 7, the large clumps are crushed first, and then it rises to crush the small clumps. During the rising process, the fly ash will also pass through the perforations 8 on the pressing plate 7, but will also be blown onto the supporting plate 5 again by the wind on the hot air blower 4. After there is no agglomeration, the supporting plate 5 is lowered to its original position for further drying.
[0050] When drying is completed, the motor 14 drives the wire drum 11 to lengthen the cable 12 so that it enters the screening chamber 17. Because the size of the screening chamber 17 is larger than the carrier plate 5, when the carrier plate 5 descends into the screening chamber 17, the fly ash stacked on the carrier plate 5 will fall from the gap to the screening plate 15 below. When the carrier plate 5 contacts the support column 26, a person pushes the push rod 29 from the outside, and the push rod 29 drives the annular push plate 28 to move toward the carrier plate 5, pushing all the fly ash on the top of the carrier plate 5 to the screening plate 15.
[0051] After pushing the two limit plates 30 to make the carrier plate 5 rise again and enter the drying chamber 6, it will be blocked by the limit plates 30, and the motor 23 will be started. The motor 23 will drive the cam 20 to move, and the cam 20 and the power wheel 19 will cooperate with each other to drive the power wheel 19 to achieve the up and down position. The linkage shaft 21 on the power wheel 19 is connected with the screening plate 15, so as to achieve the up and down vibration of the screening plate 15. There are screening meshes 16 on the screening plate 15, so that large particles of impurities are left on the screening plate 15, and the rest enter the bottom plate of the preparation cylinder 1;
[0052] After screening is completed, the modification feed port 31 is opened, and the modifier is put into the modification chamber 18, and the motor 35 is started to drive the stirring plate 37 to rotate in the modification chamber 18, so that the fly ash after screening and the modifier are mixed and stirred in the modification chamber 18, and the modifier reacts with the fly ash. At the same time, the stirring plate 37 stirs and grinds the fly ash, thereby modifying the fly ash, realizing the drying, screening and modification of the fly ash in one preparation cylinder 1, thereby improving the preparation efficiency.
[0053] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A fly ash modification device with drying and screening functions, characterized in that: The invention comprises a preparation cylinder (1) with an opening at the top, wherein the preparation cylinder (1) is provided with a top cover (2), the top cover (2) is provided with a feed port (3), a hot air blower (4) connected to an external power source is installed on the feed port (3), a carrying plate (5) for carrying coal fly ash is provided inside the preparation cylinder (1), and a drying chamber (6) is formed between the carrying plate (5) and the top cover (2); It also includes a pressing plate (7), which is located in the drying chamber (6), and is provided with a circle of annularly distributed perforations (8). The top of the pressing plate (7) is symmetrically provided with connecting rods (9) connected to the top cover (2), and the top of the top cover (2) is symmetrically provided with mounting plates (10). A rotatably connected wire drum (11) is provided between the two mounting plates (10), and two cables (12) are wound around the wire drum (11). The other end of the cable (12) passes through the top cover (2) and is fixedly connected to the supporting plate (5).
2. The fly ash modification device with drying and screening function as claimed in claim 1, characterized in that: The preparation cylinder (1) is composed of an upper and lower cylinder, the diameter of the upper cylinder is smaller than the diameter of the lower cylinder, the preparation cylinder (1) is symmetrically provided with air outlets (13) at a position close to the top cover (2), a motor (14) is provided on one side of the mounting plate (10), and the output shaft of the motor (14) is connected to the wire drum (11).
3. The fly ash modification device with drying and screening function according to claim 1, characterized in that: A screening plate (15) is provided in the lower cylinder body of the preparation cylinder (1), and a circle of annularly distributed screening meshes (16) are provided on the screening plate (15). A screening chamber (17) is formed between the screening plate (15) and the supporting plate (5), and a modification chamber (18) is formed between the screening plate (15) and the bottom plate of the preparation cylinder (1). A power screening assembly is provided outside the preparation cylinder (1), and the power screening assembly is connected to the screening plate (15).
4. The fly ash modification device with drying and screening function as claimed in claim 3, characterized in that: The power screening assembly comprises a power wheel (19), a cam (20) and a linkage shaft (21); the cam (20) is symmetrically arranged outside the preparation cylinder (1); a positioning plate (22) is provided on the side of the cam (20) away from the preparation cylinder (1); a motor 2 (23) is provided on the positioning plate (22); an output shaft of the motor 2 (23) is connected to the cam (20); the power wheel (19) is rotatably connected to the top of the cam (20) and cooperates with it.
5. The fly ash modification device with drying and screening function as claimed in claim 4, characterized in that: The preparation cylinder (1) is symmetrically provided with movable holes (24), the linkage shaft (21) is movably arranged in the movable hole (24), one end of the linkage shaft (21) is fixedly connected to the power wheel (19), and the other end is rotatably connected to the side wall of the sieve plate (15), and an embedded sponge elastic layer (25) is provided in the movable hole (24), and the sponge elastic layer (25) is movably fitted with the linkage shaft (21).
6. The fly ash modification device with drying and screening function as claimed in claim 3, characterized in that: A support column (26) is symmetrically arranged on the top of the screening plate (15), and an annular groove (27) is arranged on the inner wall of the preparation cylinder (1). The annular groove (27) is inside the screening chamber (17). An annular push plate (28) is arranged inside the annular groove (27), and the side wall of the annular push plate (28) is flush with the side wall of the preparation cylinder (1). A push rod (29) is arranged on the other side of the annular push plate (28), and the push rod (29) passes through the preparation cylinder (1) and extends to the outside. When the supporting plate descends to the top of the support column (26), the bottom of the annular push plate (28) is flush with the top surface of the supporting plate (5).
7. The fly ash modification device with drying and screening function as claimed in claim 1, characterized in that: The preparation cylinder (1) is symmetrically provided with a limit plate (30) located on the top of the large cylinder. The limit plate (30) is movably connected to the preparation cylinder (1), and the inner wall of the limit plate (30) is flush with the inside of the preparation cylinder (1).
8. The fly ash modification device with drying and screening function as claimed in claim 3, characterized in that: The preparation cylinder (1) is provided with a modified feed port (31), the modified feed port (31) is located in the modified chamber (18), the modified feed port (31) is provided with a sealing plug (32), and the bottom plate of the preparation cylinder (1) is provided with a discharge port (33), and the discharge port (33) is provided with a discharge plug (34) for sealing it.
9. The fly ash modification device with drying and screening function as claimed in claim 1, characterized in that: A motor three (35) is provided at the bottom of the bottom plate of the preparation cylinder (1), a rotating shaft (36) is provided at the center of the bottom plate of the preparation cylinder (1), a stirring plate (37) distributed in an annular pattern is provided on the rotating shaft (36), the stirring plate (37) is located in the modification chamber (18), and the output shaft of the motor three (35) is connected to the rotating shaft (36).