Pulverized coal injection device of blast furnace

Abstract

The utility model discloses a blast furnace pulverized coal injection device which comprises a base, two sets of supporting plates are symmetrically arranged on the end face of the base, a sliding groove is formed in the end face of the base, a sliding block is movably connected in the sliding groove, sealing curtains are arranged on the outer walls of the two sides of the sliding block, and the other ends of the sealing curtains are fixedly connected with the inner wall of the sliding groove. The sealing curtain is formed by hinging a plurality of sets of sealing pieces through micro hinges, and a swing mechanism for driving the swing frame to swing is installed at the upper end of the sliding block. By arranging a matching structure of the sealing curtain and the sliding groove, a plurality of groups of sealing pieces are flexibly connected through the micro hinges to form a continuous closed barrier to cover an opening of the sliding groove, pulverized coal in the blast furnace is effectively prevented from entering a transmission part, the abrasion problem caused by pulverized coal attachment is avoided, the service life of the device is prolonged, and the operation stability of the device is improved; compared with a traditional exposed gear structure, the defect that the transmission precision is reduced due to pulverized coal invasion is fundamentally overcome.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal injection technology, and in particular to a pulverized coal injection device for blast furnaces. Background Technology

[0002] As one of the core pieces of equipment in the steel industry, the operating efficiency of the blast furnace is directly related to the quality and efficiency of steel production. Among them, pulverized coal injection technology is an important component of modern blast furnace technology. It has been widely used because it improves fuel utilization, reduces emissions, and optimizes the characteristics of blast furnace slag. The uniform pulverized coal injection device plays a vital role in the normal operation of the blast furnace.

[0003] Chinese utility model patent CN220618986U discloses a blast furnace pulverized coal uniform injection device. In use, the device drives a rectangular block to swing back and forth with an external nozzle through the meshing of a first gear and a second gear, thereby achieving the effect of uniform pulverized coal injection. However, this device has certain drawbacks in actual use. For example, the gears on the device are all exposed, while the pulverized coal particles inside the blast furnace have high hardness. During injection, they will adhere to the outer wall of the gear meshing surface, aggravating wear and causing a decrease in gear transmission accuracy, which affects uniform injection. Therefore, it is necessary to propose a blast furnace pulverized coal injection device to address the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, a combined structure of sealing curtain and chute is designed. Multiple sets of sealing plates are flexibly connected by micro-hinges to form a continuous and airtight barrier, covering the chute opening. This effectively prevents pulverized coal from entering the transmission components inside the blast furnace, avoiding the drawback of reduced transmission accuracy caused by pulverized coal intrusion.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: It includes a base, with two sets of support plates symmetrically arranged on the end face of the base. A swing frame is rotatably connected between the two sets of support plates. Multiple sets of nozzles are equidistantly arranged on the outer wall of the swing frame along its axis. A sliding groove is opened on the end face of the base, and a slider is movably connected within the sliding groove. Sealing curtains are provided on both outer walls of the slider. The other end of the sealing curtain is fixedly connected to the inner wall of the sliding groove. The sealing curtain is formed by multiple sets of sealing plates hinged together by micro-hinges. A swing mechanism for driving the swing frame to swing is installed on the upper end of the slider.

[0008] Preferably, the swing mechanism includes two sets of fixed plates fixedly connected to the end face of the slider, and a connecting plate rotatably connected between the two sets of fixed plates. The swing frame is fixedly connected to two sets of connecting plates on the outer wall of the slider side, and the other end of the connecting plate is rotatably connected inside the two sets of connecting plates.

[0009] Preferably, a threaded rod is rotatably connected inside the groove, and the slider is threadedly connected to the threaded section of the threaded rod, with both outer walls of the slider in close contact with the inner wall of the groove.

[0010] Preferably, a limiting rod is fixedly connected inside the groove, and the slider is movably connected to the outer wall of the limiting rod.

[0011] Preferably, a pipe joint is installed on the side wall of the swing frame, and the pipe joint is in communication with multiple sets of nozzles.

[0012] Preferably, a servo motor is fixedly connected to the outer wall of the base, and the end of the output shaft of the servo motor is fixedly connected to the threaded rod coaxially.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the present invention provides a blast furnace pulverized coal injection device, which has the following beneficial effects:

[0015] 1. This utility model, through the combination of a sealing curtain and a sliding groove, forms a continuous and airtight barrier by flexibly connecting multiple sets of sealing plates through micro-hinges, covering the opening of the sliding groove. This effectively prevents coal dust from entering the transmission components from inside the blast furnace, avoiding wear problems caused by coal dust adhesion, improving the service life and operational stability of the device. Compared with the traditional exposed gear structure, it fundamentally solves the drawback of reduced transmission accuracy caused by coal dust intrusion.

[0016] 2. This utility model achieves precise control of the nozzle swing angle by using a threaded rod to drive the slider, combined with the hinged structure of the connecting plate and the connecting plate. This not only avoids the defect of gear meshing transmission being easily jammed by coal powder, but also ensures that the nozzle maintains stable spraying at different positions, greatly improving the uniformity and reliability of coal powder spraying. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pulverized coal injection device for blast furnaces proposed in this utility model;

[0018] Figure 2 for Figure 1 Structural diagram.

[0019] Figure 3 for Figure 1 Schematic diagram of cross-section structure.

[0020] Figure 4 for Figure 3 Structural diagram.

[0021] In the diagram: 1. Base; 2. Support plate; 3. Swing frame; 4. Nozzle; 5. Servo motor; 6. Slide groove; 7. Slider; 8. Connecting plate; 9. Sealing curtain; 10. Threaded rod; 11. Limiting rod; 12. Fixing plate; 13. Connecting plate. Detailed Implementation

[0022] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0023] This utility model provides a technical solution:

[0024] Reference Figure 1-4 A blast furnace pulverized coal injection device includes a base 1. Two sets of support plates 2 are symmetrically arranged on the end face of the base 1. A swing frame 3 is rotatably connected between the two sets of support plates 2. Multiple sets of nozzles 4 are equidistantly arranged on the outer wall of the swing frame 3 along its axis. A sliding groove 6 is opened on the end face of the base 1. A slider 7 is movably connected in the sliding groove 6. Sealing curtains 9 are provided on both sides of the outer wall of the slider 7. The other end of the sealing curtain 9 is fixedly connected to the inner wall of the sliding groove 6. The sealing curtain 9 is formed by multiple sets of sealing plates hinged by micro hinges. A swing mechanism that drives the swing frame 3 to swing is installed on the upper end of the slider 7.

[0025] Furthermore, through the dynamic telescopic design of the sealing curtain 9, the opening of the slide groove 6 can be kept closed during the reciprocating motion of the slider 7, effectively preventing coal dust in the blast furnace from entering the slide groove 6 and the interior of the swing mechanism, replacing the exposed gear structure in the original patent, and avoiding wear of transmission components caused by coal dust adhesion.

[0026] The swing mechanism includes two sets of fixed plates 12 fixedly connected to the end face of the slider 7, and a connecting plate 8 rotatably connected between the two sets of fixed plates 12. The swing frame 3 is fixedly connected to two sets of connecting plates 13 on one side of the outer wall of the slider 7, and the other end of the connecting plate 8 is rotatably connected inside the two sets of connecting plates 13.

[0027] Furthermore, through the hinged transmission between the connecting plate 8 and the connecting plate 13, the linear motion of the slider 7 is converted into the reciprocating swing of the swing frame 3, thus eliminating the traditional gear meshing method.

[0028] A threaded rod 10 is rotatably connected inside the slide groove 6, and a slider 7 is threadedly connected to the threaded section of the threaded rod 10. The outer walls on both sides of the slider 7 are in close contact with the inner wall of the slide groove 6.

[0029] Furthermore, the transmission method of the threaded rod 10 driving the slider 7 has self-locking properties, which can precisely control the displacement of the slider 7, thereby accurately adjusting the swing angle of the nozzle 4.

[0030] A limiting rod 11 is fixedly connected inside the slide 6, and a slider 7 is movably connected to the outer wall of the limiting rod 11. A pipe joint is installed on the side wall of the swing frame 3, and the pipe joint is connected to multiple sets of nozzles 4. A servo motor 5 is fixedly connected to the outer wall of the base 1, and the end of the output shaft of the servo motor 5 is coaxially fixedly connected to the threaded rod 10.

[0031] In practical use, the working principle of this utility model is as follows:

[0032] When the device is started, the servo motor 5 drives the threaded rod 10 to rotate, causing the slider 7 to slide smoothly along the inner wall of the slide groove 6. During the movement of the slider 7, the sealing curtains 9 on both sides unfold or fold synchronously with its movement. Multiple sets of sealing sheets are flexibly connected by micro hinges to form a continuous sealed barrier, covering the opening of the slide groove 6, preventing coal dust from entering the interior of the slide groove 6, and avoiding dust from entering the transmission components and causing wear.

[0033] When the slider 7 moves linearly, the fixed plate 12 on its end face is hinged to the connecting plate 13 of the swing frame 3 through the connecting plate 8, which converts the linear displacement of the slider 7 into the reciprocating swing of the swing frame 3 around the support plate 2. During this process, the limiting rod 11 guides and constrains the movement trajectory of the slider 7, ensuring that the swing angle of the swing frame 3 corresponds precisely to the displacement of the slider 7, thus eliminating the transmission error caused by coal powder jamming in traditional gear meshing.

[0034] When the swing frame 3 swings, multiple sets of nozzles 4 rotate synchronously with its axis, forming a dynamic injection path. An external air source delivers high-pressure airflow to the nozzles 4 through pipe joints, and the injection direction changes with the swing angle of the swing frame 3 to cover different areas inside the blast furnace.

[0035] In summary, during operation, the dynamic sealing of the sealing curtain 9, combined with the fitting design of the slider 7 and the chute 6, effectively prevents coal dust from entering the chute 6. Simultaneously, the self-locking characteristic of the threaded rod 10 ensures the stability of the nozzle 4 at any swing position, preventing spray angle deviation caused by airflow backflow. This effectively solves the problem of exposed gear structures being susceptible to coal dust intrusion. Furthermore, the integrated optimization of linear transmission and sealing protection significantly improves spray uniformity and device durability.

[0036] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A blast furnace pulverized coal injection device, comprising a base (1), characterized in that, The base (1) has two sets of support plates (2) symmetrically arranged on its end face. A swing frame (3) is rotatably connected between the two sets of support plates (2). Multiple sets of nozzles (4) are equidistantly arranged on the outer wall of the swing frame (3) along its axis. A sliding groove (6) is opened on the end face of the base (1). A slider (7) is movably connected in the sliding groove (6). A sealing curtain (9) is provided on both sides of the outer wall of the slider (7). The other end of the sealing curtain (9) is fixedly connected to the inner wall of the sliding groove (6). The sealing curtain (9) is made of multiple sets of sealing plates hinged by micro hinges. A swing mechanism that drives the swing frame (3) to swing is installed on the upper end of the slider (7).

2. The blast furnace pulverized coal injection device according to claim 1, characterized in that, The swing mechanism includes two sets of fixed plates (12) fixedly connected to the end face of the slider (7), and a connecting plate (8) rotatably connected between the two sets of fixed plates (12). The swing frame (3) is fixedly connected to two sets of connecting plates (13) on one side of the outer wall of the slider (7), and the other end of the connecting plate (8) is rotatably connected inside the two sets of connecting plates (13).

3. The blast furnace pulverized coal injection device according to claim 2, characterized in that, A threaded rod (10) is rotatably connected inside the groove (6), and the slider (7) is threadedly connected to the threaded section of the threaded rod (10). The outer walls on both sides of the slider (7) are in contact with the inner wall of the groove (6).

4. The blast furnace pulverized coal injection device according to claim 3, characterized in that, The sliding groove (6) is fixedly connected to a limiting rod (11), and the slider (7) is movably connected to the outer wall of the limiting rod (11).

5. The blast furnace pulverized coal injection device according to claim 4, characterized in that, The swing frame (3) has a pipe joint installed on its side wall, and the pipe joint is connected to multiple sets of nozzles (4).

6. The blast furnace pulverized coal injection device according to claim 5, characterized in that, A servo motor (5) is fixedly connected to the outer wall of the base (1), and the end of the output shaft of the servo motor (5) is coaxially fixedly connected to the threaded rod (10).

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