Continuous casting billet corner defect automatic cleaning device and defect cleaning method

Abstract

The invention discloses a continuous casting billet corner defect automatic cleaning device which comprises a plurality of sets of symmetrically arranged automatic cleaning devices, and each automatic cleaning device comprises a cleaning gun walking mechanism, a clamping and positioning mechanism, a cleaning gun, a cleaning gun nozzle, an energy medium pipeline, an energy medium control valve stand set, an electric cabinet, a slag flushing water system, an upper surface slag cleaning system and a slag stopping device. Two energy medium pipelines are arranged on the medium control valve stand set, the other end of each energy medium pipeline is connected with a cleaning gun, the cleaning guns are arranged on a clamping and positioning mechanism, the clamping and positioning mechanism is arranged on a cleaning gun walking mechanism, the cleaning gun walking mechanism drives the clamping and positioning mechanism to move front and back, and cleaning gun nozzles are arranged at the ends of the cleaning guns. The clamping and positioning mechanism is provided with an upper surface slag removing system and a slag stopping device, the slag flushing water system is arranged below the cleaning gun walking mechanism, and the energy medium control valve stand set is connected with an electric control box.

Description

Technical Field

[0001] This invention relates to the field of flame cleaning equipment for corner defects of continuously cast billets, specifically to an automatic cleaning device and method for corner defects of continuously cast billets. Background Technology

[0002] Transverse corner cracks in slabs are the most prominent quality problem in the continuous casting process of high-quality microalloyed steel. In order to eliminate the impact of corner crack defects on subsequent rolling processes, the continuous casting process is forced to remove a large number of continuously cast slabs from the line and then perform flame cleaning and corner cutting. This has a significant impact on production flow, cost control, quality stability, hot charging and hot delivery, steel plate yield, and production efficiency.

[0003] Therefore, there is an urgent need for an automatic cleaning device and method for corner defects of continuously cast billets to address the technical problems described above. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technologies and provide an automatic cleaning device and method for corner defects of continuously cast billets.

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic cleaning device for corner defects of continuously cast billets: comprising multiple symmetrically arranged automatic cleaning devices, each automatic cleaning device including a cleaning gun traveling mechanism, a clamping and positioning mechanism, a cleaning gun, a cleaning gun nozzle, a medium pipeline, a medium control valve assembly, an electrical control box, a slag flushing water system, an upper surface slag cleaning system, and a slag blocking device. The medium control valve assembly is provided with two medium pipelines, each of which is connected to a cleaning gun at its other end. The cleaning gun is mounted on the clamping and positioning mechanism, which is mounted on the cleaning gun traveling mechanism, enabling the cleaning gun traveling mechanism to drive the clamping and positioning mechanism to move back and forth. The cleaning gun has a cleaning gun nozzle at its end. The clamping and positioning mechanism is equipped with an upper surface slag cleaning system and a slag blocking device. The slag flushing water system is located below the cleaning gun traveling mechanism. The medium control valve assembly is connected to the electrical control box.

[0006] The method for cleaning corner defects of continuously cast billets using the above-mentioned automatic cleaning device is characterized by: the first step: when the billet moves to the cleaning gun position with the continuous casting machine, the slag flushing water system, the upper surface slag cleaning system and the slag blocking device are turned on.

[0007] The second step is to adjust the cleaning gun, the upper surface slag removal system, and the slag blocking device to the position where the corner defects of the billet need to be cleaned.

[0008] The third step is to open the valves of the energy control valve group and supply gas and oxygen to the cleaning gun through the operation of the electrical control box. The high temperature and high pressure flame at the spray point of the cleaning gun, along with the oxygen, melts and blows away the defective area at the corner of the billet through iron powder or oxygen blowing pipe and other ignition devices. At the same time, high pressure non-combustible gas is supplied to the upper surface slag removal system to blow away the molten iron slag on the billet, preventing the formation of slag nodules on the surface of the billet. The slag baffle plate of the slag baffle device blocks the splashed molten steel into fine granular steel slag, which falls into the molten slag collection chute. Then, the molten iron slag is flushed into the vortex pool by the slag flushing water system.

[0009] Operate the button on the electrical control box to start the cleaning mode, and then use iron powder or fire rods to melt and clean the defective areas at the corners of the billet.

[0010] The fourth step is to observe the cleaning effect on the cleaning area, and then make fine adjustments to the position of the cleaning gun and the angle of the cleaning nozzle according to the size of the defect, so as to adjust the width and depth of the cleaning area.

[0011] Fifth step: After the billet exits the casting machine at the end of the casting cycle, turn off the cleaning gun and the energy valve of the upper surface slag removal system through the electrical control box. Then, return the cleaning gun, the upper surface slag removal system, and the slag blocking device to their original positions. The online automatic cleaning of corner defects of the billet is completed.

[0012] As an improvement, the angle between the cleaning gun and the cleaning nozzle of the gun body is set within the range of 75°-135°;

[0013] The horizontal angle between the airflow direction at the cleaning nozzle and the center line of the casting flow is 0-50°, and the vertical angle is 0-45°.

[0014] The diameter range of the oxygen pores cut by the cleaning gun nozzle is 4-12mm;

[0015] The gas supply range for the control valve assembly is 0.05-0.25 MPa, the preheating oxygen range is 0.05-0.5 MPa, and the main cutting oxygen range is 0.1-0.7 MPa.

[0016] The flushing water pressure of the flushing water system is ≥0.5MPa, and the pressure of the high-pressure non-combustible gas injected by the slag cleaning system is ≥0.4MPa.

[0017] The advantages of this invention compared with the prior art are: this automatic cleaning device is easy to operate and can realize online automatic cleaning of corner defects of billets; it reduces or avoids manual cleaning after the billets come off the line, thus effectively eliminating the impact of corner crack defects on subsequent steel rolling processes, and greatly promoting smooth production, cost control, quality stability, hot charging and hot delivery, steel plate yield and production efficiency.

[0018] High-pressure non-combustible gas is used to purge and clean the molten iron slag on the billet to prevent slag nodules from forming on the billet surface. The slag-blocking device and slag-blocking plate block the splashed molten steel into fine granular steel slag, which falls into the slag collection chute. The slag can be flushed into the cyclone pool of the pump station by the slag flushing water system, and then collected and reused to save resources.

[0019] The cleaning gun, through its traveling mechanism, can adapt to and adjust the width of various slab specifications and the width of the cleaning surface. After the gun is adjusted to the position to be cleaned at the corner of the slab, the clamping and positioning mechanism fixes the gun body, which can achieve a stable cleaning width and is relatively convenient to use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an automatic cleaning device and method for corner defects of continuously cast billets according to the present invention.

[0021] As shown in the figure:

[0022] 1. Cleaning gun traveling mechanism; 2. Clamping and positioning mechanism; 3. Cleaning gun; 4. Cleaning nozzle; 5. Energy medium pipeline; 6. Energy medium control valve assembly; 7. Electrical control box; 8. Slag flushing water system; 9. Upper surface slag cleaning system; 10. Slag blocking device. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Combined with appendix Figure 1 An automatic cleaning device for corner defects of continuously cast billets includes multiple symmetrically arranged automatic cleaning devices. Each automatic cleaning device includes a cleaning gun traveling mechanism 1, a clamping and positioning mechanism 2, a cleaning gun 3, a cleaning gun nozzle 4, a medium pipe 5, a medium control valve assembly 6, an electrical control box 7, a slag flushing water system 8, an upper surface slag cleaning system 9, and a slag blocking device 10. The medium control valve assembly 6 has two medium pipes 5, each connected to a cleaning gun 3 at its other end. The cleaning gun 3 is mounted on the clamping and positioning mechanism 2, which is mounted on the cleaning gun traveling mechanism 1, enabling the cleaning gun traveling mechanism 1 to drive the clamping and positioning mechanism 2 to move back and forth. The cleaning gun 3 has a cleaning gun nozzle 4 at its end. The clamping and positioning mechanism 2 has an upper surface slag cleaning system 9 and a slag blocking device 10. The slag flushing water system 8 is located below the cleaning gun traveling mechanism 1. The medium control valve assembly 6 is connected to the electrical control box 7.

[0025] The method for cleaning corner defects of continuously cast billets using the above-mentioned automatic cleaning device is characterized by: Step 1: When the billet moves to the cleaning gun 3 position with the continuous casting machine, the slag flushing water system 8, the upper surface slag cleaning system 9 and the slag blocking device 10 are turned on.

[0026] The second step is to adjust the cleaning gun 3, the upper surface slag removal system 9, and the slag blocking device 10 to the position where the corner defects of the billet need to be cleaned.

[0027] The third step is to open the valve of the energy control valve group 6 and supply gas and oxygen to the cleaning gun 3 through the operation of the electrical control box 7. The high temperature and high pressure flame at the spray point of the cleaning gun 2 is used to melt and blow away the defective area at the corner of the billet through iron powder or oxygen blowing pipe and other ignition devices. At the same time, high pressure non-combustible gas is supplied to the upper surface slag cleaning system 9. The high pressure non-combustible gas is used to blow away the molten iron slag of the billet to avoid the formation of slag nodules on the surface of the billet. The splashed molten steel is blocked by the slag baffle plate of the slag baffle device 10 to form fine granular steel slag, which falls into the molten slag collection chute. Then the molten iron slag is flushed into the vortex pool by the slag flushing water system (8).

[0028] Operate button 7 on the electrical control box to start the cleaning mode, and use iron powder or fire rods to melt and clean the defective areas at the corners of the billet.

[0029] The fourth step is to observe the cleaning effect of the cleaning area, and then make fine adjustments to the position of the cleaning gun 3 and the angle of the cleaning gun nozzle 4 according to the size of the defect, so as to adjust the width and depth of the cleaning area.

[0030] Fifth step: After the billet exits the casting machine after the casting cycle is completed, the cleaning gun 3 and the energy valve of the upper surface slag removal system 9 are turned off through the electrical control box 7. Then the cleaning gun 3, the upper surface slag removal system 9 and the slag blocking device 10 are returned to their original positions, and the online automatic cleaning of the corner defects of the billet is completed.

[0031] The angle between the cleaning gun 3 and the cleaning nozzle 4 is set within the range of 75°-135°.

[0032] The horizontal angle between the airflow direction of the cleaning nozzle 4 and the center line of the casting flow is 0-50°, and the vertical angle is 0-45°.

[0033] The diameter range of the oxygen pores cut by the cleaning nozzle 4 is 4-12mm;

[0034] The gas supply adjustment range for the control valve assembly 6 is 0.05-0.25MPa, the preheating oxygen adjustment range is 0.05-0.5MPa, and the main cutting oxygen adjustment range is 0.1-0.7MPa.

[0035] The flushing water system 8 has a flushing water pressure ≥ 0.5 MPa, and the high-pressure non-combustible gas pressure injected by the slag cleaning system 9 is ≥ 0.4 MPa.

[0036] In specific implementation of this invention, the device is first installed above the pre-cut roller conveyor in the billet exit area, in a relatively fixed state; during use, the billet is kept at a relatively stable running speed with the straightening machine, providing a uniform cutting amount for the billet cutting angle, and will not cause abnormal situations such as billet digging or cutting damage.

[0037] Step 1: When the billet moves to the cleaning gun 3 position with the continuous casting machine, turn on the slag flushing water system 8, the upper surface slag cleaning system 9 and the slag blocking device 10;

[0038] The second step is to adjust the cleaning gun 3, the upper surface slag removal system 9, and the slag blocking device 10 to the corner defect of the billet to be cleaned according to the width of the billet by the cleaning gun traveling mechanism 1. Then, the cleaning gun 3 is fixed by the clamping and positioning mechanism to achieve a stable cleaning width.

[0039] The third step is to open the valve of the energy control valve group 6 and supply gas and oxygen to the cleaning gun 3 through the operation of the electrical control box 7. The high temperature and high pressure flame at the spray point of the cleaning gun 2 is used, and the oxygen is used to melt and blow away the defective area at the corner of the billet through the ignition device such as iron powder or oxygen blowing pipe. At the same time, high pressure non-combustible gas is supplied to the upper surface slag cleaning system 9. The high pressure non-combustible gas is used to blow away the molten iron slag of the billet to avoid the formation of slag nodules on the surface of the billet. The slag blocking device 10 blocks the splashed molten steel into fine granular steel slag, which falls into the molten slag collection chute. Then, the molten iron slag is flushed into the vortex pool by the slag flushing water system (8).

[0040] Operate button 7 on the electrical control box to start the cleaning mode, and use iron powder or fire rods to melt and clean the defective areas at the corners of the billet.

[0041] The fourth step is to observe the cleaning effect of the cleaning area, and then make fine adjustments to the position of the cleaning gun 3 and the angle of the cleaning gun nozzle 4 according to the size of the defect, so as to adjust the width and depth of the cleaning area.

[0042] Fifth step: After the billet exits the casting machine after the casting cycle is completed, the cleaning gun 3 and the energy valve of the upper surface slag removal system 9 are turned off through the electrical control box 7. Then the cleaning gun 3, the upper surface slag removal system 9 and the slag blocking device 10 are returned to their original positions, and the online automatic cleaning of the corner defects of the billet is completed.

[0043] When making adjustments, the angle setting range between the cleaning gun 3 and the cleaning nozzle 4 is 75°-135°.

[0044] The horizontal angle between the airflow direction of the cleaning nozzle 4 and the center line of the casting flow is 0-50°, and the vertical angle is 0-45°.

[0045] The diameter range of the oxygen pores cut by the cleaning nozzle 4 is 4-12mm;

[0046] The gas supply adjustment range for the control valve assembly 6 is 0.05-0.25MPa, the preheating oxygen adjustment range is 0.05-0.5MPa, and the main cutting oxygen adjustment range is 0.1-0.7MPa.

[0047] The flushing water system 8 has a flushing water pressure ≥ 0.5 MPa, and the high-pressure non-combustible gas pressure injected by the slag cleaning system 9 is ≥ 0.4 MPa.

[0048] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of the embodiments of the present invention, "multiple" means at least two.

[0051] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0052] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. An automatic cleaning device for corner defects of continuously cast billets, characterized in that: The system includes multiple symmetrically arranged automatic cleaning devices. Each automatic cleaning device comprises a cleaning gun traveling mechanism (1), a clamping and positioning mechanism (2), a cleaning gun (3), a cleaning nozzle (4), a medium pipe (5), a medium control valve assembly (6), an electrical control box (7), a slag flushing water system (8), a top surface slag cleaning system (9), and a slag blocking device (10). The medium control valve assembly (6) has two medium pipes (5), each of which is connected to a cleaning gun (3) at its other end. 3) Set on the clamping and positioning mechanism (2), the clamping and positioning mechanism (2) is set on the cleaning gun traveling mechanism (1) to realize that the cleaning gun traveling mechanism (1) drives the clamping and positioning mechanism (2) to move back and forth. The cleaning gun (3) is provided with a cleaning nozzle (4) at the end. The clamping and positioning mechanism (2) is provided with an upper surface cleaning system (9) and a slag blocking device (10). The slag flushing water system (8) is set below the cleaning gun traveling mechanism (1). The energy medium control valve assembly (6) is connected to an electrical control box (7).

2. The method of cleaning corner defects of continuous casting billet using the above-mentioned automatic cleaning device is characterized by: First step: when the billet moves to the cleaning gun (3) position with the continuous casting machine, the slag flushing water system (8), the upper surface slag cleaning system (9) and the slag blocking device (10) are turned on. The second step is to adjust the cleaning gun (3), the upper surface slag removal system (9), and the slag blocking device (10) to the position where the corner defects of the billet need to be cleaned. The third step is to open the valve of the energy control valve assembly (6) and supply gas and oxygen to the cleaning gun (3) through the operation of the electrical control box (7). The high temperature and high pressure flame at the spray point of the cleaning gun (2) is used, and oxygen is used to melt and blow away the defective area at the corner of the billet through iron powder or oxygen blowing pipe and other ignition devices. At the same time, high pressure non-combustible gas is supplied to the upper surface slag removal system (9). The high pressure non-combustible gas is used to blow away the molten iron slag on the billet to avoid the formation of slag nodules on the surface of the billet. The slag baffle plate of the slag baffle device (10) blocks the splashed molten steel to form fine granular steel slag, which falls into the slag collection chute. Then the molten iron slag is flushed into the vortex pool by the slag flushing water system (8). The fourth step is to observe the cleaning effect of the cleaning area, and then make fine adjustments to the position of the cleaning gun (3) and the angle of the cleaning nozzle (4) according to the size of the defect, so as to adjust the width and depth of the cleaning area. Fifth step: After the billet exits the casting machine after the casting cycle is completed, the cleaning gun (3) and the energy valve of the upper surface slag removal system (9) are turned off through the electrical control box (7). Then the cleaning gun (3), the upper surface slag removal system (9) and the slag blocking device (10) are returned to their original positions, and the online automatic cleaning of the corner defects of the billet is completed.

3. The method for cleaning corner defects of continuously cast billets according to claim 2, characterized in that: The angle between the cleaning gun (3) and the cleaning nozzle (4) is set within the range of 75°-135°; The horizontal angle between the airflow direction and the center line of the casting flow is 0-50°, and the vertical angle is 0-45°. The diameter range of the cutting oxygen hole of the cleaning nozzle (4) is 4-12mm; The gas supply range of the control valve assembly (6) is 0.05-0.25MPa, the preheating oxygen range is 0.05-0.5MPa, and the main cutting oxygen range is 0.1-0.7MPa. The flushing water system (8) has a flushing water pressure ≥ 0.5 MPa, and the upper slag cleaning system (9) has a high-pressure non-combustible gas pressure ≥ 0.4 MPa.

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