Steel slag particle grading filtering device and filtering method thereof

Abstract

The invention relates to the technical field of metallurgical equipment, and discloses a steel slag particle grading filtering device and a filtering method thereof.The steel slag particle grading filtering device comprises a supporting base and a feeding box, a first servo motor is installed at the center position of the top face of the supporting base, and a driving rotating rod is fixed to the output end of the first servo motor; the outer surface of the driving rotating rod is rotationally connected with a water storage tank in a sleeving mode, the bottom face of the water storage tank is fixed to the top face of the supporting base, and a first filtering frame, a second filtering frame and a third filtering frame are sequentially arranged in the water storage tank in a sleeving mode. The steel slag particle grading and filtering device has the advantages that the steel slag particles can be dehydrated, the steel slag particles and heat exchange water can be effectively graded and collected, the problems of incomplete grading and inconvenience in filtered water collection during use of an existing steel slag particle grading and filtering device are solved, the operation convenience and grading accuracy of the grading and filtering device are improved, and manpower and material resources are saved.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment technology, specifically to a steel slag particle grading and filtration device and its filtration method. Background Technology

[0002] Steel slag is a byproduct of steelmaking, produced to remove impurities from steel. It includes slag-forming agents, mud and sand carried in from the metal material, oxides formed by the oxidation of aluminum, silicon, manganese, etc. in scrap steel, iron ore used as a coolant or oxidant, iron oxide scale, iron-containing sludge, etc. Steel slag contains abundant resources, and hot steel slag has abundant heat energy. After being processed into steel slag particles, the steel slag is cooled after heat recovery and then subjected to graded filtration and recycling.

[0003] Most grading devices on the market currently use vibrating screens or conveyor-type filter belts. However, both of them are prone to problems such as slow particle grading efficiency and incomplete particle grading due to particle accumulation during grading filtration. They cannot perform accurate and complete grading filtration, and the filtered water after cooling and heat exchange cannot be effectively treated and collected. This makes the entire grading filtration process more complicated and cumbersome, increasing the workload of operators. Summary of the Invention

[0004] To address the problems of incomplete grading and inconvenient water collection in existing steel slag particle grading and filtration devices, this invention provides a steel slag particle grading and filtration device and its filtration method to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A steel slag particle grading and filtration device includes a support base and a feeding box. A first servo motor is installed at the center of the top surface of the support base. A drive rod is fixed to the output end of the first servo motor. A water tank is rotatably sleeved on the outer surface of the drive rod for collecting filtered water. The bottom surface of the water tank is fixed to the top surface of the support base. A first filter frame, a second filter frame, and a third filter frame are sequentially sleeved inside the water tank. Filter screens are fixed inside the lower part of each of the first, second, and third filter frames. The first, second, and third filter frames are detachably fixed to the drive rod. Lifting and moving components are provided on both sides of the support base for driving the first, second, and third filter frames to lift and move. A feeding box is provided on the side of the support base for storing steel slag particles to be filtered.

[0006] Furthermore, a third cover plate, a second cover plate, and a first cover plate are respectively fixed on the outer surfaces of the first filter frame, the second filter frame, and the third filter frame on the top surface of the filter screen. The first cover plate covers the top surface of the second filter frame, the second cover plate covers the top surface of the first filter frame, and the third cover plate covers the top surface of the water tank.

[0007] Furthermore, the mesh size of the filter screens on the first, second, and third filter frames gradually increases, a drain pipe is fixedly installed through the bottom of the water tank, the drain pipe is connected to the recycling tank through a water pipe, and the diameter of the water tank, the first filter frame, the second filter frame, and the third filter frame gradually decreases.

[0008] Furthermore, a fixing sleeve is fixed at the center of the bottom surface inside the first filter frame, the second filter frame, and the third filter frame. A rectangular hole that mates with a support column is opened inside each fixing sleeve and at the bottom of the first filter frame, the support column is threaded with a fixing bolt, and the top of the fixing bolt abuts against the top surface of the fixing sleeve of the third filter frame. Another fixing sleeve is fixed at the center of the bottom surface of the first filter frame. The height of the fixing sleeve inside the third filter frame is equal to the height of the third filter frame.

[0009] Furthermore, the lifting and moving assembly includes a support frame, a second servo motor, a lead screw assembly, a moving frame, a servo cylinder, and a connecting block. Support frames are provided on both sides of the support base. A second servo motor is installed on the outer side of each of the two support frames. The output ends of the two second servo motors rotate through the support frames. A lead screw assembly is fixed to one end of each second servo motor output end that extends into the inner side of the support frame. The moving frame is connected to the inner output end of each of the two lead screw assemblies. A servo cylinder is installed on each of the two moving frames. A connecting block is fixedly connected to the output end of each lead screw assembly. The connecting block clamps on both sides of the first filter frame, the second filter frame, and the third filter frame.

[0010] Furthermore, the upper parts of both sides of the first filter frame, the second filter frame and the third filter frame are all fixed with first fixing sleeves, and the connecting blocks are all inserted into the first fixing sleeves. Each first fixing sleeve has a rectangular slot that cooperates with the connecting block.

[0011] Furthermore, each of the two lead screw assemblies includes a lead screw, a lifting frame, and a movable sleeve. A third servo motor is installed at the bottom of each lifting frame. A lead screw is rotatably connected inside each of the two lifting frames. The output ends of the two third servo motors are fixed to the bottom of the lead screw. A movable sleeve is threaded onto each of the two lead screws. The two movable sleeves are slidably connected inside the lifting frame. One end of each movable sleeve extending to the outside of the lifting frame is fixed to the side wall of the movable frame.

[0012] Furthermore, a second fixing sleeve is fixed to both outer surfaces of the feeding box, and the distance between the center of the second fixing sleeve and the bottom surface of the feeding box is equal to the distance between the center of the second servo motor and the bottom surface of the support frame.

[0013] Furthermore, the inner diameter of the feeding box is smaller than the inner diameter of the third filter frame, and a positioning plate is fixed in the middle of one side of the support base. The end of the positioning plate away from the support base is set as an arc shape to cooperate with the feeding box.

[0014] A method for classifying and filtering steel slag particles, the method comprising the following steps: S1. Select the first filter frame, second filter frame and third filter frame with the corresponding mesh size according to the grading requirements. Put the first filter frame, second filter frame, third filter frame and the fixed sleeve connected to them onto the support column in sequence. Finally, tighten the fixing bolt to the top of the support column and fix it so that the fixing bolt abuts against the top surface of the fixed sleeve inside the third filter frame. Fix the first filter frame, second filter frame and third filter frame inside the water storage tank. S2, the steel slag to be filtered is discharged into the feeding box and placed against the second servo motor. During placement, the two second fixed sleeves are perpendicular to the lead screw assembly. The second servo motor drives the lead screw assembly to rotate to the horizontal. The third servo motor drives the lead screw to rotate, thereby moving the connecting block to align with the second fixed sleeve. Then, the servo cylinder pushes the connecting block into the second fixed sleeve and clamps the feeding box. The second servo motor drives the feeding box to move in a circle through the lead screw assembly. After the feeding box moves to the tilt position, the material inside is poured into the third filter frame. After the second servo motor lowers the feeding box, the servo cylinder drives the connecting block to move out of the second fixed sleeve. S3, after the steel slag enters the third filter frame, the filtered water flows into the water storage tank through the filter screen and is discharged through the drain pipe. At this time, the first servo motor runs and rotates through the first, second and third filter frames. Under the action of centrifugal force, the steel slag particles inside the third filter frame pass through the filter screen in sequence, thereby filtering the steel slag particles according to volume classification and collecting the filtered steel slag inside the first, second and third filter frames. During the filtration process, the steel slag particles are dehydrated simultaneously. S4, when no more steel slag particles pass through the filter screen, the grading filtration is complete. The first servo motor stops running. When it stops, the first fixed sleeve is aligned with the connecting blocks on both sides. The operator tightens the fixing bolts and separates them from the support column. The second servo motor runs and drives the screw assembly to rotate to the vertical position. The third servo motor runs and drives the connecting blocks to move to the alignment with the first fixed sleeve. The servo cylinder runs and pushes the connecting blocks into the first fixed sleeve and clamps them. The screw assembly runs again and drives the third filter frame to rise. After it rises, the screw assembly driven by the second servo motor rotates and rotates the third filter frame to tilt downwards for material discharge. S5, after the third filter frame is discharged, the connecting block moves outward and the third filter frame is removed from the connecting block. Then, the second servo motor, the lead screw assembly and the servo cylinder operate to take out the second filter frame and the first filter frame in sequence for feeding. After all the feeding is completed, the first filter frame, the second filter frame and the third filter frame are sequentially placed on the support column and fixed with fixing bolts. Then, the next stage of grading filtration can be carried out.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, centrifugal sieving is used for grading and filtration, which can quickly and effectively grade steel slag particles while also dewatering them. It can effectively collect steel slag particles and exchange hot water, solving the problems of incomplete grading and inconvenient water collection that are common in existing steel slag particle grading and filtration devices. This improves the convenience and accuracy of the grading and filtration device during operation, and saves manpower and resources.

[0016] 2. In this invention, the rotating loading and unloading structure allows the material to be filtered to be poured into the third filter frame during filtration. After loading, the third filter frame, the second filter frame, and the first filter frame can be lifted and rotated in sequence to unload the material. This makes loading and unloading the graded filtration device more convenient and labor-saving during use. The shared lifting components make the structure of the filtration device simpler and easier to maintain.

[0017] 3. In this invention, the third filter frame, the second filter frame and the first filter frame are designed to be detachable, so that the graded steel slag particles can be poured out sequentially during feeding. At the same time, it is also convenient to clean or maintain the detached filter frames, which further improves the practicality of the filtration device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a graded filtration device according to an embodiment of this application; Figure 2 yes Figure 1 A bottom view of the three-dimensional structure of the graded filtration device in the embodiment shown; Figure 3 yes Figure 1 The schematic diagram of the split structure of the tiered filtration device in the embodiment shown is as follows; Figure 4 yes Figure 1 The schematic diagram of the graded filtration device during material discharge in the embodiment shown; Figure 5 yes Figure 1 The diagram shows the structure of the second filter frame in the embodiment shown. Figure 6 yes Figure 1 A schematic diagram of the structure of the third filter frame in the embodiment shown; Figure 7 yes Figure 1 A schematic diagram of the feeding box in the embodiment shown.

[0020] The meanings of the reference numerals in the attached diagram are as follows: 1. Support base; 2. First servo motor; 3. Water tank; 4. Drive rod; 5. Support column; 6. Drain pipe; 7. First filter frame; 8. Second filter frame; 9. Third filter frame; 10. Filter screen; 11. Fixing sleeve; 12. Fixing bolt; 13. First cover plate; 14. Second cover plate; 15. Third cover plate; 16. Support frame; 17. Second servo motor; 18. Lead screw assembly; 19. Third servo motor; 20. Moving frame; 21. Servo cylinder; 22. First fixing sleeve; 23. Connecting plug; 24. Feeding box; 25. Second fixing sleeve; 26. Positioning plate. Detailed Implementation

[0021] To make the purpose, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Reference Figures 1-7A steel slag particle grading and filtration device includes a support base 1 and a feeding box 24. A first servo motor 2 is installed at the center of the top surface of the support base 1. A drive rod 4 is fixed to the output end of the first servo motor 2. A water storage tank 3 is rotatably sleeved on the outer surface of the drive rod 4 for collecting filtered water. The bottom surface of the water storage tank 3 is fixed to the top surface of the support base 1. A first filter frame 7, a second filter frame 8, and a third filter frame 9 are sequentially sleeved inside the water storage tank 3. Filter screens 10 are fixed inside the lower part of the first filter frame 7, the second filter frame 8, and the third filter frame 9. The first filter frame 7, the second filter frame 8, and the third filter frame 9 are detachably fixed on the drive rod 4 for driving the first filter frame 7, the second filter frame 8, and the third filter frame 9 to move up and down. A feeding box 24 is provided on the side of the support base 1 for storing steel slag particles to be filtered. Lifting and moving components are provided on both sides of the support base 1 for controlling the lifting and rotation of the first filter frame 7, the second filter frame 8, the third filter frame 9, and the feeding box 24.

[0023] In this embodiment, a third cover plate 15, a second cover plate 14, and a first cover plate 13 are respectively fixed on the outer surfaces of the first filter frame 7, the second filter frame 8, and the third filter frame 9 on the top surface of the filter screen 10. The first cover plate 13 covers the top surface of the second filter frame 8, the second cover plate 14 covers the top surface of the first filter frame 7, and the third cover plate 15 covers the top surface of the water tank 3. The mesh count of the filter screen 10 on the first filter frame 7, the second filter frame 8, and the third filter frame 9 gradually increases. A drain pipe 6 is fixed through the bottom of the water tank 3. The drain pipe 6 is connected to the recycling tank through a water pipe. The diameter of the water tank 3, the first filter frame 7, the second filter frame 8, and the third filter frame 9 gradually decreases.

[0024] In this embodiment, a fixing sleeve 11 is fixed at the center of the bottom surface of the first filter frame 7, the second filter frame 8, and the third filter frame 9. A rectangular hole that mates with the support column 5 is opened inside the fixing sleeve 11 and at the bottom of the first filter frame 7, the second filter frame 8, and the third filter frame 9. A fixing bolt 12 is threaded onto the top surface of the support column 5. The top of the fixing bolt 12 abuts against the top surface of the fixing sleeve 11 of the third filter frame 9. Another fixing sleeve 11 is fixed at the center of the bottom surface of the first filter frame 7. The height of the fixing sleeve 11 inside the third filter frame 9 is equal to the height inside the third filter frame 9.

[0025] In this embodiment, the lifting and moving assembly includes a support frame 16, a second servo motor 17, a lead screw assembly 18, a moving frame 20, a servo cylinder 21, and a connecting block 23. Support frames 16 are provided on both sides of the support base 1. Second servo motors 17 are mounted on the outer sides of both support frames 16. The output ends of both second servo motors 17 rotatably pass through the support frame 16. A lead screw assembly 18 is fixed to one end of each second servo motor 17 that extends into the inner side of the support frame 16. The output ends of both lead screw assemblies 18 are... The system is connected to a movable frame 20, and a servo cylinder 21 is installed on each of the two movable frames 20. A connecting plug 23 is fixedly connected to the output end of the lead screw assembly 18. The connecting plug 23 is clamped on both sides of the first filter frame 7, the second filter frame 8, and the third filter frame 9. A first fixing sleeve 22 is fixed on the upper part of both sides of the first filter frame 7, the second filter frame 8, and the third filter frame 9. The connecting plug 23 is inserted into the first fixing sleeve 22. A rectangular slot that mates with the connecting plug 23 is opened inside each first fixing sleeve 22.

[0026] In this embodiment, the two lead screw assemblies 18 include lead screws, lifting frames, and movable sleeves. A third servo motor 19 is installed at the bottom of each lifting frame. Lead screws are rotatably connected inside each of the two lifting frames. The output ends of the two third servo motors 19 are fixed to the bottom of the lead screws. Movable sleeves are threaded onto each of the two lead screws. The two movable sleeves are slidably connected inside the lifting frames. The ends of the two movable sleeves extending to the outside of the lifting frames are fixed to the side wall of the movable frame 20.

[0027] In this embodiment, the outer surfaces of both sides of the feeding box 24 are fixed with second fixing sleeves 25. The distance between the center of the second fixing sleeve 25 and the bottom surface of the feeding box 24 is equal to the distance between the center of the second servo motor 17 and the bottom surface of the support frame 16. The inner diameter of the feeding box 24 is smaller than the inner diameter of the third filter frame 9. A positioning plate 26 is fixed in the middle of one side of the support base 1. The end of the positioning plate 26 away from the support base 1 is set to be an arc shape that cooperates with the feeding box 24.

[0028] A method for grading and filtering steel slag particles, the method comprising the following steps: S1. Select the first filter frame 7, the second filter frame 8, and the third filter frame 9 with the corresponding mesh size according to the grading requirements. Place the first filter frame 7, the second filter frame 8, the third filter frame 9, and the fixed sleeve 11 connected to them onto the support column 5 in sequence. Finally, tighten the fixing bolt 12 to the top of the support column 5 and make the fixing bolt 12 abut against the top surface of the fixed sleeve 11 inside the third filter frame 9. Fix the first filter frame 7, the second filter frame 8, and the third filter frame 9 inside the water storage tank 3. S2, the steel slag to be filtered is discharged into the feeding box 24 and the feeding box 24 is placed against the second servo motor 17. During placement, the two second fixed sleeves 25 are perpendicular to the lead screw assembly 18. The second servo motor 17 drives the lead screw assembly 18 to rotate to the horizontal. The third servo motor 19 drives the lead screw to rotate, thereby driving the connecting plug 23 to move to align with the second fixed sleeve 25. Then the servo cylinder 21 pushes the connecting plug 23 into the second fixed sleeve 25 and clamps the feeding box 24. The second servo motor 17 drives the feeding box 24 to move in a circle through the lead screw assembly 18. After the feeding box 24 moves to the tilt, the material inside is poured into the third filter frame 9. After the second servo motor 17 lowers the feeding box 24, the servo cylinder 21 drives the connecting plug 23 to move out of the second fixed sleeve 25. S3, after the steel slag enters the third filter frame 9, the filtered water flows into the water storage tank 3 through the filter screen 10 and is discharged and collected through the drain pipe 6. At this time, the first servo motor 2 runs and rotates through the first filter frame 7, the second filter frame 8 and the third filter frame 9. At this time, the steel slag particles inside the third filter frame 9 pass through the filter screen 10 in sequence under the action of centrifugal force, thereby filtering the steel slag particles according to volume classification, and collecting the filtered steel slag inside the first filter frame 7, the second filter frame 8 and the third filter frame 9. During the filtration process, the steel slag particles are dehydrated simultaneously. S4, when no more steel slag particles pass through the filter screen 10, the grading filtration is completed, the first servo motor 2 stops running, when it stops, the first fixed sleeve 22 is aligned with the connecting blocks 23 on both sides, the operator tightens the fixing bolt 12 and separates it from the support column 5, the second servo motor 17 runs and drives the screw assembly 18 to rotate to the vertical, the third servo motor 19 runs and drives the connecting blocks 23 to move to the alignment with the first fixed sleeve 22, the servo cylinder 21 runs and pushes the connecting blocks 23 into the first fixed sleeve 22 and clamps them, the screw assembly 18 runs again and drives the third filter frame 9 to rise, after it rises, the screw assembly 18 driven by the second servo motor 17 rotates and rotates the third filter frame 9 to tilt downward for material discharge; S5, after the third filter frame 9 is discharged, the connecting block 23 moves outward and the third filter frame 9 is removed from the connecting block 23. Then, the second servo motor 17, the lead screw assembly 18 and the servo cylinder 21 run, and the second filter frame 8 and the first filter frame 7 are taken out in sequence for feeding. After all the feeding is completed, the first filter frame 7, the second filter frame 8 and the third filter frame 9 are sequentially placed on the support column 5 and fixed with the fixing bolts 12. Then, the next stage of grading filtration can be carried out.

[0029] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A steel slag particle grading and filtering device, characterized in that: Includes a support base (1) and a feeding box (24). A first servo motor (2) is installed at the center of the top surface of the support base (1). A drive rod (4) is fixed at the output end of the first servo motor (2). A water tank (3) is rotatably sleeved on the outer surface of the drive rod (4) for collecting filtered water. The bottom surface of the water tank (3) is fixed to the top surface of the support base (1). A first filter frame (7), a second filter frame (8), and a third filter frame (9) are sequentially sleeved inside the water tank (3). The lower part of the first filter frame (7), the second filter frame (8), and the third filter frame (9) are... Each part is fixed with a filter screen (10). The mesh count of the filter screens (10) on the first filter frame (7), the second filter frame (8) and the third filter frame (9) gradually increases. The first filter frame (7), the second filter frame (8) and the third filter frame (9) are detachably fixed on the drive rotating rod (4). The side of the support base (1) is provided with a feeding box (24) for storing steel slag particles to be filtered. Both sides of the support base (1) are provided with lifting and moving components for controlling the lifting and rotation of the first filter frame (7), the second filter frame (8), the third filter frame (9) and the feeding box (24).

2. The steel slag particle grading and filtering device according to claim 1, characterized in that: The outer surfaces of the first filter frame (7), the second filter frame (8) and the third filter frame (9) on the top surface of the filter screen (10) are respectively fixed with a third cover plate (15), a second cover plate (14) and a first cover plate (13). The first cover plate (13) covers the top surface of the second filter frame (8), the second cover plate (14) covers the top surface of the first filter frame (7), and the third cover plate (15) covers the top surface of the water tank (3).

3. The steel slag particle grading and filtering device according to claim 1, characterized in that: The bottom of the water tank (3) is fixed with a drain pipe (6), which is connected to the recycling tank through a water pipe. The diameters of the water tank (3), the first filter frame (7), the second filter frame (8) and the third filter frame (9) gradually decrease.

4. The steel slag particle grading and filtering device according to claim 1, characterized in that: A fixing sleeve (11) is fixed at the center of the bottom surface inside the first filter frame (7), the second filter frame (8) and the third filter frame (9). A rectangular hole that mates with a support column (5) is opened inside each fixing sleeve (11) and at the bottom of the first filter frame (7), the second filter frame (8) and the third filter frame (9). A fixing bolt (12) is threaded onto the top surface of the support column (5). The top of the fixing bolt (12) abuts against the top surface of the fixing sleeve (11) of the third filter frame (9). Another fixing sleeve (11) is fixed at the center of the bottom surface of the first filter frame (7). The height of the fixing sleeve (11) inside the third filter frame (9) is equal to the height inside the third filter frame (9).

5. The steel slag particle grading and filtering device according to claim 1, characterized in that: The lifting and moving assembly includes a support frame (16), a second servo motor (17), a lead screw assembly (18), a moving frame (20), a servo cylinder (21), and a connecting block (23). The support base (1) is provided with support frames (16) on both sides. The two support frames (16) are equipped with second servo motors (17) on their outer sides. The output ends of the two second servo motors (17) rotate through the support frame (16). The output ends of the second servo motors (17) that pass through to the inner side of the support frame (16) are fixed with lead screw assemblies (18). The inner output ends of the two lead screw assemblies (18) are connected to the moving frame (20). The two moving frames (20) are equipped with servo cylinders (21). The output ends of the lead screw assemblies (18) are fixedly connected with connecting blocks (23). The connecting blocks (23) are clamped on both sides of the first filter frame (7), the second filter frame (8), and the third filter frame (9).

6. The steel slag particle grading and filtering device according to claim 5, characterized in that: The first filter frame (7), the second filter frame (8) and the third filter frame (9) are all fixed with first fixing sleeves (22) on both sides. The connecting plugs (23) are all inserted into the first fixing sleeves (22). Each first fixing sleeve (22) has a rectangular slot that cooperates with the connecting plugs (23).

7. The steel slag particle grading and filtering device according to claim 5, characterized in that: The two lead screw assemblies (18) include lead screws, lifting frames and moving sleeves. A third servo motor (19) is installed at the bottom of each lifting frame. Lead screws are rotatably connected inside each of the two lifting frames. The output ends of the two third servo motors (19) are fixed to the bottom of the lead screws. Moving sleeves are threaded on each of the two lead screws. Moving sleeves are slidably connected inside the lifting frames. One end of each moving sleeve extending to the outside of the lifting frame is fixed to the side wall of the moving frame (20).

8. The steel slag particle grading and filtering device according to claim 1, characterized in that: The outer surfaces of both sides of the feeding box (24) are fixed with second fixing sleeves (25). The distance between the center of the second fixing sleeve (25) and the bottom surface of the feeding box (24) is equal to the distance between the center of the second servo motor (17) and the bottom surface of the support frame (16).

9. The steel slag particle grading and filtering device according to claim 1, characterized in that: The inner diameter of the feeding box (24) is smaller than the inner diameter of the third filter frame (9). A positioning plate (26) is fixed in the middle of one side of the support base (1). The end of the positioning plate (26) away from the support base (1) is set to be arc-shaped to cooperate with the feeding box (24).

10. A method for classifying and filtering steel slag particles, applied to the steel slag particle classification and filtering device according to any one of claims 1-9, characterized in that: The hierarchical filtering method includes the following steps: S1. Select the first filter frame (7), the second filter frame (8) and the third filter frame (9) with the corresponding mesh size according to the grading requirements. Put the first filter frame (7), the second filter frame (8) and the third filter frame (9) and the fixed sleeve (11) connected to them onto the support column (5) in sequence. Finally, screw the fixing bolt (12) to the top of the support column (5) and make the fixing bolt (12) abut against the top surface of the fixed sleeve (11) inside the third filter frame (9). Fix the first filter frame (7), the second filter frame (8) and the third filter frame (9) inside the water tank (3). S2, the steel slag to be filtered is discharged into the feeding box (24), and the feeding box (24) is placed against the second servo motor (17). When placed, the two second fixed sleeves (25) are perpendicular to the screw assembly (18). The second servo motor (17) runs and drives the screw assembly (18) to rotate to the horizontal. The third servo motor (19) runs and drives the screw to rotate, thereby driving the connecting plug (23) to move to align with the second fixed sleeve (25). Then the servo cylinder (21) runs and pushes. The movable connecting block (23) is inserted into the second fixed sleeve (25) and clamps the feeding box (24). The second servo motor (17) runs and drives the feeding box (24) to move in a circle through the lead screw assembly (18). After the feeding box (24) moves to the tilt position, the material inside is poured into the third filter frame (9). After the second servo motor (17) runs and lowers the feeding box (24), the servo cylinder (21) runs and drives the connecting block (23) to move out of the second fixed sleeve (25). S3, after the steel slag enters the third filter frame (9), the filtered water flows into the water storage tank (3) through the filter screen (10) in sequence, and is discharged and collected through the drain pipe (6). At this time, the first servo motor (2) runs and rotates through the first filter frame (7), the second filter frame (8) and the third filter frame (9). At this time, the steel slag particles inside the third filter frame (9) pass through the filter screen (10) in sequence under the action of centrifugal force, so as to filter the steel slag particles according to volume classification, and collect the filtered steel slag inside the first filter frame (7), the second filter frame (8) and the third filter frame (9). During the filtration process, the steel slag particles are dehydrated simultaneously. S4, when no more steel slag particles pass through the filter screen (10), the grading filtration is completed, the first servo motor (2) stops running, when it stops, the first fixed sleeve (22) is aligned with the connecting blocks (23) on both sides, the operator tightens the fixing bolt (12) and separates it from the support column (5), the second servo motor (17) runs and drives the screw assembly (18) to rotate to the vertical, the third servo motor (19) runs and drives the connecting block (23) to move to the alignment with the first fixed sleeve (22), the servo cylinder (21) runs and pushes the connecting block (23) to insert into the first fixed sleeve (22) and clamp it, the screw assembly (18) runs again and drives the third filter frame (9) to rise, after it rises, the screw assembly (18) driven by the second servo motor (17) rotates and rotates the third filter frame (9) to tilt downward for material discharge; S5, after the third filter frame (9) is discharged, the connecting block (23) moves outward and the third filter frame (9) is removed from the connecting block (23). Then the second servo motor (17), the lead screw assembly (18) and the servo cylinder (21) run to take out the second filter frame (8) and the first filter frame (7) in sequence for feeding. After all the feeding is completed, the first filter frame (7), the second filter frame (8) and the third filter frame (9) are sequentially placed on the support column (5) and fixed by the fixing bolt (12) before the next grading filtration can be carried out.

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