A slag powder air flow screening device

Abstract

The utility model discloses a kind of mineral slag micro-powder airflow screening equipment, including box and feed pipe, vertically arranged net cylinder in box, the upper end of net cylinder is provided with top plate, lower end is provided with conical screen, the lower end of conical screen is provided with outer tube, coaxially arranged with center tube in outer tube, the lower end of center tube extends to the below of outer tube, spiral conveyor is connected on the center tube below the outer tube, feed pipe is communicated with the feed port of spiral conveyor, multiple groups of spout are arranged on the center tube in net cylinder with up and down interval, horizontal screen is arranged in the box below conical screen, the bottom of box is provided with fine material outlet, coarse material outlet is respectively arranged on the sidewall of box above horizontal screen and the bottom of outer tube, brush is connected on the center tube in net cylinder and the bottom of conical screen by connecting rod, brush is respectively contacted with the surface of net cylinder, conical screen and horizontal screen. Above all, the utility model has the advantages of online screen cleaning, high work efficiency, high screening precision.

Description

Technical Field

[0001] This utility model relates to the technical field of airflow screening equipment, specifically to an airflow screening equipment for slag micro powder. Background Technology

[0002] Slag powder, also known as mineral powder or slag concentrate, is a fine powder produced from blast furnace slag during the ironmaking process in the metallurgical industry. This slag powder is processed through drying, grinding, and other processes. In the production of slag powder, to control its fineness, improve its activity, optimize its performance, and ensure compliance with relevant standards, it needs to be sieved after grinding. Airflow screening equipment is used in this process. Airflow screening equipment is a high-precision screening device for sieving fine powders using a screen. Using air as a carrier, the material is mixed with air by a negative pressure airflow and then enters the middle of the screen's impeller. In a closed state, the high-speed airflow propels the fully diffused powder particles with sufficient kinetic energy to be sprayed onto the screen, achieving rapid classification. Particles that cannot pass through the screen are discharged through the discharge pipe.

[0003] Existing airflow screening equipment frequently experiences screen clogging during the screening of slag powder, reducing screening efficiency and disrupting normal operations. The primary solution is to rinse the screens with water after screening, but this process is time-consuming, labor-intensive, wasteful of water, and requires downtime, further reducing production efficiency. Secondly, the screening accuracy of slag powder is often low, with problems of coarse particles being mixed with fine powder or fine powder being mixed with coarse powder. Therefore, developing an airflow screening device for slag powder that enables online screen cleaning, offers high efficiency, and high screening accuracy is objectively necessary. Utility Model Content

[0004] The purpose of this invention is to provide a slag powder airflow screening device that can achieve online screen cleaning, high working efficiency, and high screening accuracy.

[0005] The purpose of this utility model is achieved as follows: It includes a housing and a feed pipe. A mesh cylinder is vertically arranged inside the housing. A top plate is provided at the upper end of the mesh cylinder, and a conical mesh is provided at the lower end. A motor is installed on the top of the housing, and the output shaft of the motor is connected to the top plate for transmission. An outer tube is provided at the lower end of the conical mesh. The lower end of the outer tube is sealed and extends to the bottom of the housing. A central tube is coaxially arranged inside the outer tube. The upper end of the central tube is sealed and extends into the upper part of the mesh cylinder. The lower end of the central tube extends to the bottom of the outer tube. The center of the outer tube is located below the outer tube. A screw conveyor is connected to the pipe, and the feed pipe is connected to the feed inlet of the screw conveyor. Multiple sets of nozzles are arranged at intervals on the central pipe inside the mesh cylinder. Each set of nozzles is evenly distributed along the circumference of the central pipe. A horizontal mesh is installed in the box below the cone mesh. A fine material outlet is provided at the bottom of the box. Coarse material outlets are provided on the side wall of the box above the horizontal mesh and at the bottom of the outer pipe. Brushes are connected to the central pipe inside the mesh cylinder and the bottom of the cone mesh through connecting rods. The brushes are in contact with the surfaces of the mesh cylinder, cone mesh and horizontal mesh respectively.

[0006] Furthermore, the nozzle is inclined with nozzles, and the inclination directions of two adjacent sets of nozzles are opposite.

[0007] Furthermore, the connecting rod is a telescopic rod.

[0008] Furthermore, a baffle cone is installed on the central tube near the cone mesh, with the large end of the baffle cone suspended in the air.

[0009] Furthermore, a spiral guide plate is installed inside the central tube below the screw conveyor.

[0010] Furthermore, a dispersing rod is installed at one end of the screw conveyor shaft after it extends into the central tube.

[0011] Furthermore, the bottom of the box is inclined, and the fine material outlet is located at the lower end of the bottom of the box.

[0012] When this invention is in operation, the motor is started, driving the top plate, screen cylinder, and cone screen to rotate. The screw conveyor is then activated, feeding slag powder into the screw conveyor through the feed pipe. The screw conveyor quantitatively delivers the slag powder. Simultaneously, pressurized gas is introduced from the lower end of the central tube. When the slag powder falls into the central tube from the opening end of the screw conveyor, it is carried by the airflow, dispersed within the airflow, and carried upwards. Then, it is sprayed out from various nozzles, directed towards the screen cylinder. Smaller particles of slag powder pass through the screen cylinder's mesh, enter the annular area between the screen cylinder and the housing, and fall, completing the main screening process for the slag powder. Small slag powders fall onto the horizontal mesh. After being filtered by the horizontal mesh, slag powders that meet the particle size requirements fall to the bottom of the box and are discharged. Meanwhile, coarse slag powders mixed in with the fine powders are trapped on the horizontal mesh, completing the filtration of coarse particles in the fine powder. At the same time, during the filtration of slag powders by the mesh cylinder, the coarse particles are trapped by the mesh cylinder and fall onto the cone mesh. The cone mesh filters these coarse particles, and the fine powder mixed in passes through the cone mesh holes and falls onto the horizontal mesh, and is discharged after passing through the horizontal mesh holes. The coarse particles enter the area between the outer tube and the central tube and are discharged, completing the filtration of fine particles in the coarse powder. In the aforementioned working process, the slag powder, driven by airflow, undergoes primary screening and filtration through a screen cylinder. Fine powder passing through the screen cylinder is then filtered again by a horizontal mesh to remove any remaining coarse particles, thus resolving the problem of coarse particles being trapped in existing screening processes. Simultaneously, the coarse powder retained by the screen cylinder is filtered again by a conical mesh to remove any remaining fine particles, resolving the problem of fine particles being trapped in existing screening processes. This improves the screening accuracy of the slag powder, resulting in higher working efficiency and better screening effect. Furthermore, this invention addresses the issue of mesh size limitations in existing airflow screening equipment. To address the clogging issue, brushes are connected to the central tube inside the screen cylinder and the bottom of the conical screen via connecting rods. The brushes on the central tube are stationary, while the screen cylinder and conical screen rotate. During this rotation, the brushes clean the screen cylinder and conical screen. Similarly, the horizontal screen is stationary, while the brushes on the conical screen rotate, cleaning the horizontal screen during rotation. The cleaning and screening processes occur simultaneously, ensuring unobstructed flow to all filter components without downtime or disruption to the screening operation. This improves the equipment's screening efficiency and ultimately guarantees and enhances the company's production efficiency. In summary, this invention offers the advantages of online screen cleaning, high efficiency, and high screening accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] In the diagram: 1-box body, 2-feed pipe, 3-mesh cylinder, 4-conical mesh, 5-motor, 6-outer pipe, 7-center pipe, 8-screw conveyor, 9-horizontal mesh, 10-connecting rod, 11-brush, 12-spray pipe, 13-baffle cone, 14-spiral guide plate, 15-dispersing rod. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0016] like Figure 1 As shown, this utility model includes a housing 1 and a feed pipe 2. A mesh cylinder 3 is vertically arranged inside the housing 1. A top plate is provided at the upper end of the mesh cylinder 3, and a conical mesh 4 is provided at the lower end. A motor 5 is installed on the top of the housing 1, and the output shaft of the motor 5 is connected to the top plate for transmission. An outer tube 6 is provided at the lower end of the conical mesh 4. The lower end of the outer tube 6 is sealed and extends to the bottom of the housing 1. A central tube 7 is coaxially arranged inside the outer tube 6. The upper end of the central tube 7 is sealed and extends into the upper part of the mesh cylinder 3. The lower end of the central tube 7 extends to the bottom of the outer tube 6. A screw conveyor 8 is connected to the central tube 7 below the outer tube 6. The feed pipe 2 and the screw conveyor 8 are connected to the screw conveyor 8. The feed inlet of the rotary conveyor 8 is connected. Multiple sets of nozzles are arranged at intervals on the central tube 7 inside the mesh cylinder 3. Each set of nozzles is evenly distributed along the circumference of the central tube 7. The number of nozzles in each set is determined according to parameters such as the diameter of the central tube 7 and the airflow velocity. A horizontal mesh 9 is provided in the box 1 below the cone mesh 4. A fine material outlet is provided at the bottom of the box 1. Coarse material outlets are provided on the side wall of the box 1 above the horizontal mesh 9 and at the bottom of the outer tube 6. Brushes 11 are connected to the central tube 7 inside the mesh cylinder 3 and the bottom of the cone mesh 4 through connecting rods 10. The brushes 11 are in contact with the surfaces of the mesh cylinder 3, the cone mesh 4 and the horizontal mesh 9 respectively.

[0017] When this utility model is in operation, the motor 5 is started, which drives the top plate, screen cylinder 3, and cone screen 4 to rotate. The screw conveyor 8 is also started, and slag powder is introduced into the screw conveyor 8 through the feed pipe 2. The screw conveyor 8 quantitatively delivers the slag powder. Simultaneously, pressurized gas is introduced from the lower end of the central pipe 7. When the slag powder falls into the central pipe 7 from the opening end of the screw conveyor 8, it is carried by the airflow, dispersed in the airflow, and carried upwards. Then, it is sprayed out from various nozzles, directed towards the screen cylinder 3. Smaller slag powder particles pass through the mesh of the screen cylinder 3, enter the annular area between the screen cylinder 3 and the box body 1, and fall, completing the main screening work of the slag powder. Smaller slag powders fall onto the horizontal mesh 9. After being filtered by the horizontal mesh 9, the slag powder with the required particle size falls to the bottom of the box 1 and is discharged. Meanwhile, the coarse slag powder mixed in with the fine powder is trapped on the horizontal mesh 9, completing the filtration of coarse particles in the fine powder. At the same time, during the filtration of the slag powder by the mesh cylinder 3, the coarse particles are trapped by the mesh cylinder 3 and fall onto the cone mesh 4. The cone mesh 4 filters these coarse particles. The fine powder mixed in passes through the mesh of the cone mesh 4 and falls onto the horizontal mesh 9, and is discharged after passing through the mesh of the horizontal mesh 9. The coarse particles enter the area between the outer tube 6 and the central tube 7 and are discharged, completing the filtration of fine particles in the coarse powder.

[0018] In the above-mentioned working process, the slag powder, driven by airflow, undergoes primary screening and filtration through the screen cylinder 3. The fine powder passing through the screen cylinder 3 is then filtered again by the horizontal mesh 9 to remove any remaining coarse particles, thus solving the problem of coarse particles being trapped in existing screening processes. Simultaneously, the coarse powder trapped by the screen cylinder 3 is filtered again by the conical mesh 4 to remove any remaining fine particles, solving the problem of fine particles being trapped in existing screening processes. This improves the screening accuracy of the slag powder, resulting in higher working efficiency and better screening effect. Furthermore, addressing the mesh clogging problem in existing airflow screening equipment, the screen cylinder 3... Brushes 11 are connected to the central tube 7 and the bottom of the cone mesh 4 via connecting rods. The brushes 11 on the central tube 7 are stationary, but the screen cylinder 3 and the cone mesh 4 are rotating. During the rotation of the screen cylinder 3 and the cone mesh 4, the brushes 11 clean the screen cylinder 3 and the cone mesh 4. Similarly, the horizontal mesh 9 is stationary, while the brushes 11 on the cone mesh 4 are rotating. During the rotation of the brushes 11, the horizontal mesh 9 is cleaned. The cleaning work is carried out simultaneously with the screening work, which can ensure the smooth flow of each filter component at any time without stopping the machine to wait, and does not affect the normal operation of the screening operation, thereby improving the screening efficiency of the equipment and ultimately ensuring and improving the production efficiency of the enterprise.

[0019] The nozzle is inclined with a nozzle 12. The two adjacent nozzles 12 are inclined in opposite directions, that is, the upper nozzle 12 is inclined upward and the lower nozzle 12 is inclined downward. When the airflow carrying slag powder is ejected from the nozzle 12, the airflow ejected from the two nozzles 12 will meet in the air and then collide. Due to the impact, the slag powder will be further dispersed, making the slag powder more dispersed and the contact area with the screen cylinder 3 larger, resulting in higher filtration efficiency.

[0020] Link 10 is a telescopic rod, used for connecting and supporting brush 11. During operation, brush 11 removes slag powder adhering to the screen cylinder 3, cone screen 4, and horizontal screen 9. With continuous use, brush 11 inevitably wears down, becoming shorter and reducing the cleaning effect on the screen cylinder 3, cone screen 4, and horizontal screen 9. To solve this problem, link 10 is designed as a telescopic rod. When brush 11 becomes too short to achieve a good cleaning effect, the telescopic rod extends, allowing brush 11 to re-engage with the screens, ensuring both cleaning and filtration effectiveness. In practical use, an automatically telescopic structure such as an electric push rod can be used for easier operation.

[0021] A baffle cone 13 is installed on the central tube 7 near the cone mesh 4. The large end of the baffle cone 13 is suspended. Large particles of coarse powder intercepted by the mesh cylinder 3 fall onto the cone mesh 4 and need to be filtered through the cone mesh 4. However, it has been found in use that the position where the coarse powder falls onto the cone mesh 4 is random and not fixed. In this case, the coarse powder that falls near the side wall of the box 1 can be fully filtered as it slides towards the center of the box 1, effectively filtering out the fine powder particles. However, some coarse powder falls near the center of the box 1. In this case, due to the longer filtration time and distance, the coarse powder falls to a position closer to the center of the box 1. Because fine powder mixed in with coarse powder may not have enough time to be filtered before falling into the outer tube 6 along with other coarse powder particles, the final coarse powder still contains fine powder, reducing the filtration effect. To solve this problem, a baffle cone 13 is set up so that large coarse powder particles fall onto the baffle cone 13 and then slide down towards the suspended end of the baffle cone 13. The sliding position is close to the side wall of the box 1, so that all coarse powder can slide from the outside of the cone screen 4 to its inside, ensuring that all coarse powder can be fully filtered, completely solving the problem of fine powder mixed in with coarse powder, and improving the filtration and screening effect.

[0022] A spiral guide plate 14 is installed inside the central pipe 7 below the screw conveyor 8. Airflow with a certain pressure flows into the central pipe 7 from the lower end of the central pipe 7. The slag powder enters the central pipe 7 through the screw conveyor 8. In actual use, it was found that there is a problem of uneven distribution of slag powder in the airflow, which affects the conveying effect of the airflow and also affects the filtration efficiency of the subsequent screen cylinder 3. Therefore, the spiral guide plate 14 is set. When the airflow passes through the spiral guide plate 14, it can form a spiral airflow. The spiral airflow can better carry the slag powder and has a certain stirring and dispersing effect, which can make the slag powder more evenly distributed, thereby improving the conveying efficiency and the filtration efficiency of the subsequent screen cylinder 3.

[0023] A dispersing rod 15 is installed after one end of the rotating shaft of the screw conveyor 8 extends into the central tube 7. The slag powder is introduced into the screw conveyor 8 through the feed pipe 2 and pushed into the central tube 7 by the screw blades of the screw conveyor 8. However, due to the characteristics of the slag powder itself, such as high adsorption, easy agglomeration and poor flowability, a certain amount of clumps may be generated. These clumps are not easy to disperse, which is not conducive to airflow transportation, nor to subsequent filtration and screening. In order to solve this problem, the dispersing rod 15 is set up. During the rotation of the rotating shaft of the screw conveyor 8, the dispersing rod 15 can agitate the slag powder and achieve the purpose of dispersing.

[0024] The bottom of the housing 1 is inclined, and the fine material outlet is located at the lower end of the bottom of the housing 1. During operation, all fine slag powder particles that meet the particle size requirements will fall to the bottom of the housing 1 and then be discharged from the fine material outlet. In actual production, it was found that some slag powder always accumulates at the bottom of the housing 1 and cannot be completely discharged. To solve this problem, the bottom of the housing 1 is inclined, so that the fine slag powder can slide down to the lower end under the action of gravity, thereby enabling the fine powder particles to be discharged quickly and completely.

Claims

1. A slag powder airflow screening device, comprising a housing (1) and a feed pipe (2), characterized in that: A mesh cylinder (3) is vertically installed inside the box (1). A top plate is installed at the upper end of the mesh cylinder (3), and a cone mesh (4) is installed at the lower end. A motor (5) is installed on the top of the box (1). The output shaft of the motor (5) is connected to the top plate for transmission. An outer tube (6) is installed at the lower end of the cone mesh (4). The lower end of the outer tube (6) is sealed and extends to the bottom of the box (1). A central tube (7) is coaxially installed inside the outer tube (6). The upper end of the central tube (7) is sealed and extends into the upper part of the mesh cylinder (3). The lower end of the central tube (7) extends to the bottom of the outer tube (6). A screw conveyor (8) is connected to the central tube (7) below the outer tube (6). The feed pipe ( 2) Connected to the feed inlet of the screw conveyor (8), the central tube (7) inside the mesh cylinder (3) is provided with multiple sets of nozzles at intervals, and each set of nozzles is evenly distributed around the circumference of the central tube (7). A horizontal mesh (9) is provided in the box (1) below the cone mesh (4). A fine material outlet is provided at the bottom of the box (1). A coarse material outlet is provided on the side wall of the box (1) above the horizontal mesh (9) and at the bottom of the outer tube (6). A brush (11) is connected to the central tube (7) inside the mesh cylinder (3) and the bottom of the cone mesh (4) through a connecting rod (10). The brush (11) is in contact with the surfaces of the mesh cylinder (3), the cone mesh (4) and the horizontal mesh (9) respectively.

2. The slag micronized airflow screening equipment according to claim 1, characterized in that: The nozzle is provided with an inclined nozzle (12), and the inclination directions of two adjacent sets of nozzles (12) are opposite.

3. The slag micronized airflow screening equipment according to claim 1, characterized in that: The connecting rod (10) is a telescopic rod.

4. The slag micronized airflow screening equipment according to claim 1, characterized in that: A baffle cone (13) is provided on the central tube (7) near the cone mesh (4), with the large end of the baffle cone (13) suspended in the air.

5. The slag micronized airflow screening equipment according to claim 1, characterized in that: A spiral guide plate (14) is installed inside the central tube (7) below the spiral conveyor (8).

6. The slag micronized airflow screening equipment according to claim 1, characterized in that: The screw conveyor (8) has a dispersing rod (15) installed after one end of its shaft extends into the central tube (7).

7. The slag micronized airflow screening equipment according to claim 1, characterized in that: The bottom of the box (1) is inclined, and the fine material outlet is located at the lower end of the bottom of the box (1).

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