Argon blowing device for continuous casting tundish cover

Abstract

The utility model discloses an argon blowing device for a tundish cover in continuous casting. Comprising a tundish, a tundish first cover, a tundish second cover, a tundish third cover, a first cover argon branch pipe penetrating through the tundish first cover, a second cover argon branch pipe penetrating through the tundish second cover and a third cover argon branch pipe penetrating through the tundish third cover, wherein the tundish first cover, the tundish second cover, the tundish third cover, the first cover argon branch pipe, the second cover argon branch pipe and the third cover argon branch pipe are sequentially arranged above the tundish from the first end to the second end. The first cover argon branch pipe, the second cover argon branch pipe and the third cover argon branch pipe are connected with the argon main pipe, the input end of the argon main pipe is connected with the gas source pipeline, and the argon main pipe is used for blowing argon into the tundish and replacing air in the tundish in the continuous casting process to prevent molten steel from making contact with the air in the continuous casting process. High temperature can be effectively isolated, the service life of the device is prolonged, argon blowing protection is carried out on molten steel in the pouring process, contact between the molten steel and air is reduced, the cleanliness of the molten steel is improved, and finally the finished product quality of a casting blank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical machinery, in particular to an argon blowing device for a continuous casting tundish cover. Background Art

[0002] The tundish is the last container for holding molten steel in the steelmaking process during continuous casting. Since there is a gap between the tundish and the cover, and there are also stopper holes, baking holes, temperature measuring holes, etc. arranged on the cover.

[0003] Therefore, during the pouring process, the molten steel in the tundish is extremely easy to come into contact with air, resulting in secondary oxidation of the molten steel and an increase in the nitrogen content in the molten steel, thereby affecting the properties of the steel such as toughness, plasticity, and weldability. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an argon blowing device for a continuous casting tundish cover, which can significantly reduce the contact between air and molten steel during the pouring process by displacing the air in the tundish, thereby improving the cleanliness of the molten steel.

[0005] To solve the above technical problems, an embodiment of the utility model provides an argon blowing device for a continuous casting tundish cover, which includes a tundish and a first tundish cover, a second tundish cover, and a third tundish cover sequentially arranged from the first end to the second end above the tundish, and a first cover argon gas branch pipe passing through the first tundish cover, a second cover argon gas branch pipe passing through the second tundish cover, and a third cover argon gas branch pipe passing through the third tundish cover. The first cover argon gas branch pipe, the second cover argon gas branch pipe, and the third cover argon gas branch pipe are connected to an argon main pipe, and the input end of the argon main pipe is connected to a gas source pipeline, so as to blow argon into the tundish during continuous casting to displace the air therein and reduce the contact between the molten steel and air during continuous casting.

[0006] Wherein, the included angle between the air outlet of the first cover argon gas branch pipe and the bottom of the first tundish cover, the included angle between the air outlet of the second cover argon gas branch pipe and the bottom of the second tundish cover, and the included angle between the third cover argon gas branch pipe and the bottom of the third tundish cover are 60° - 90°, and the height difference between the air outlet of the first cover argon gas branch pipe and the bottom of the first tundish cover, the height difference between the air outlet of the second cover argon gas branch pipe and the bottom of the second tundish cover, and the height difference between the air outlet of the third cover argon gas branch pipe and the bottom of the third tundish cover are 2 - 5 cm.

[0007] Wherein, it also includes a first flowmeter and a first regulating valve arranged on the first cover argon branch pipe, a second flowmeter and a second regulating valve arranged on the second cover argon branch pipe, and a third flowmeter and a third regulating valve arranged on the third cover argon branch pipe, wherein the first flowmeter is used to detect the gas flow through the first cover argon branch pipe, the first regulating valve is used to adjust the gas flow through the first cover argon branch pipe, the second flowmeter is used to detect the gas flow through the second cover argon branch pipe, the second regulating valve is used to adjust the gas flow through the second cover argon branch pipe, the third flowmeter is used to detect the gas flow through the third cover argon branch pipe, the third regulating valve is used to adjust the gas flow through the third cover argon branch pipe, the first cover argon branch pipe, the second cover argon branch pipe, the second cover argon branch pipe and the argon main pipe are connected by a first metal hose bolt.

[0008] The main pipe support is fixed on the step surface at the edge of the tundish, and is used to limit the argon main pipe and control the argon main pipe to maintain a predetermined distance from the tundish.

[0009] Among them, it also includes a quick-connect joint arranged at the front end of the air inlet of the argon main pipe, the quick-connect joint is connected to the air inlet of the argon main pipe through a second metal hose, and is connected to the air outlet of the total flow meter through a third metal hose. The total flow meter is used to display the current blowing flow in real time. The quick-connect joint is used to quickly connect or quickly separate the argon main pipe and the gas source pipeline. The gas source pipeline is provided with a ball valve for controlling the opening degree of the output end of the gas source pipeline and adjusting the air intake of the argon main pipe. The ball valve is located on the side of the total flow meter away from the quick-connect joint.

[0010] Among them, it also includes a display connected to the total flow meter, the first flow meter, the second flow meter, and the third flow, and a PLC controller connected to the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve. The display is used to display the real-time detection flow of the total flow meter, the first flow meter, the second flow meter, and the third flow. The PLC controller is used to detect the opening of the corresponding ball valve, the first regulating valve, the second regulating valve, and the third regulating valve according to control instructions.

[0011] Among them, it also includes a communication module linked to the display and the PLC controller, which is used to output the display content of the display, output the opening of the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve, or accept external control instructions to control the opening of the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve. The communication module includes at least one of a 4G unit, a 5G unit, and a WiFi unit.

[0012] The number of the first cover argon branch pipes and the second cover argon branch pipes is 5-7, and the number of the second cover argon branch pipes is 7-10.

[0013] The argon blowing device for the continuous casting ladle cover provided in the embodiment of the utility model has the following advantages compared with the prior art:

[0014] The argon blowing device for the continuous casting tundish cover provided by the embodiment of the utility model can effectively isolate high temperature and extend the service life of the device by arranging the argon branch pipe inside the tundish cover. The input end of the argon main pipe is connected to the gas source pipeline. During the continuous casting process, argon is blown into the tundish to replace the air therein, thereby reducing the contact between molten steel and air during the continuous casting process. During the pouring process, argon is blown to protect the molten steel, thereby improving the cleanliness of the molten steel and ultimately improving the quality of the cast billet. At the same time, argon branch pipes are respectively installed on the first cover, the second cover and the third cover of the tundish, and the main pipe and the branch pipe can be separated. It is suitable for all tundish cover structures to improve the scope of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic structural diagram of an embodiment of an argon blowing device for a continuous casting ladle provided by the utility model;

[0017] Among them, 1-intermediate package, 2-first cover of the intermediate package, 3-second cover of the intermediate package, 4-third cover of the intermediate package, 5-argon branch pipe of the first cover, 6-argon branch pipe of the second cover, 7-argon branch pipe of the third cover, 8-main pipe bracket, 9-argon main pipe, 10-first metal hose, 11-second metal hose, 12-quick connect connector, 13-third metal hose, 14-total flow meter, 15-ball valve, 16-gas source pipeline. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Please refer to Figure 1 , Figure 1 The present invention is a schematic structural diagram of an embodiment of an argon blowing device for a continuous casting ladle provided by the present invention.

[0020] In a specific embodiment, the argon blowing device for the continuous casting tundish cover comprises a tundish 1 and a tundish first cover 2, a tundish second cover 3, a tundish third cover 4 which are arranged above the tundish 1 in sequence from the first end to the second end, and a first cover argon branch pipe 5 passing through the first cover 2 of the tundish, a second cover argon branch pipe 6 passing through the second cover 3 of the tundish, and a third cover argon branch pipe 7 passing through the third cover 4 of the tundish, the first cover argon branch pipe 5, the second cover argon branch pipe 6, and the third cover argon branch pipe 7 are connected to an argon main pipe 9, and the input end of the argon main pipe 9 is connected to a gas source pipeline 16, so as to blow argon into the tundish 1 during the continuous casting process to replace the air therein and reduce the contact between the molten steel and the air during the continuous casting process.

[0021] By arranging the argon branch pipe inside the ladle cover, high temperature can be effectively isolated and the service life of the device can be extended. The input end of the argon main pipe 9 is connected to the gas source pipeline 16. During the continuous casting process, argon is blown into the tundish 1 to replace the air therein, thereby reducing the contact between the molten steel and the air during the continuous casting process. During the pouring process, the argon is blown to protect the molten steel, thereby improving the cleanliness of the molten steel and ultimately improving the quality of the cast billet. At the same time, argon branch pipes are installed on the first cover 2 of the tundish, the second cover 3 of the tundish, and the third cover 4 of the tundish respectively. The main pipe and the branch pipe can be separated, which is suitable for all ladle cover structures and improves the scope of use.

[0022] In order to ensure the stable output of gas and improve the utilization efficiency of the pipeline, in one embodiment, the angle between the outlet of the first cover argon branch pipe 5 and the bottom of the first cover 2 of the middle package, the angle between the outlet of the second cover argon branch pipe 6 and the bottom of the second cover 3 of the middle package, and the angle between the third cover argon branch pipe 7 and the bottom of the third cover 4 of the middle package are 60°-90°, and the height difference between the outlet of the first cover argon branch pipe 5 and the bottom of the first cover 2 of the middle package, the height difference between the outlet of the second cover argon branch pipe 6 and the bottom of the second cover 3 of the middle package, and the height difference between the outlet of the third cover argon branch pipe 7 and the bottom of the third cover 4 of the middle package are 2-5cm.

[0023] By passing the argon gas branch pipe through the bottom of the tundish cover and setting its included angle as a larger angle, it can ensure the gas flow in a specified direction, more accurately align with the positions where air needs to be replaced, and improve the replacement efficiency. Adopting a distance of 2 - 5 cm for the gas outlet to exceed the bottom surface can reduce the usage amount of its pipeline. If the pipeline is too long, it may affect the use of existing process equipment; if it is too small, it may be damaged by the tundish, increasing the difficulties during the construction process.

[0024] In this application, there are no restrictions on the included angle between the gas outlet of the argon gas branch pipe and the bottom of the corresponding tundish cover, nor on its height difference.

[0025] In order to further improve the efficient detection and control of gas injection at each position, avoid situations such as excessive gas injection in some areas while insufficient injection in other areas, and improve the gas injection efficiency and the gas detection efficiency.

[0026] In one embodiment, the argon gas blowing device for the continuous casting tundish cover further includes a first flowmeter and a first regulating valve provided on the first argon gas branch pipe 5, a second flowmeter and a second regulating valve provided on the second argon gas branch pipe 6, and a third flowmeter and a third regulating valve provided on the third argon gas branch pipe 7. Among them, the first flowmeter is used to detect the gas flow rate through the first argon gas branch pipe 5, the first regulating valve is used to adjust the gas flow rate through the first argon gas branch pipe 5, the second flowmeter is used to detect the gas flow rate through the second argon gas branch pipe 6, the second regulating valve is used to adjust the gas flow rate through the second argon gas branch pipe 6, the third flowmeter is used to detect the gas flow rate through the third argon gas branch pipe 7, the third regulating valve is used to adjust the gas flow rate through the third argon gas branch pipe 7, and the first argon gas branch pipe 5, the second argon gas branch pipe 6, the second argon gas branch pipe 6 and the argon gas main pipe 9 are bolt - connected through a first metal hose 10.

[0027] By setting the corresponding flowmeters and regulating valves, it can achieve real - time detection and adjustment of gas injection in the corresponding areas, enabling the injection of a specified flow rate of gas in the specified area and improving the gas injection efficiency. On the other hand, through flow detection, it can be compared with the expected value or the total injection. If gas leakage occurs, it can be detected in real - time for maintenance, improving the maintenance efficiency. By comparing with the expected value, it can be adjusted to the specified flow rate, reducing the possible errors of the regulating valve itself and improving the gas utilization efficiency.

[0028] The first argon gas branch pipe 5, the second argon gas branch pipe 6, the second argon gas branch pipe 6 and the argon gas main pipe 9 are bolt - connected through a first metal hose 10, which can separate the argon gas main pipe 9 and the branch pipes, avoid affecting the installation and disassembly of the tundish cover, and improve the installation efficiency.

[0029] The present application includes but is not limited to the use of metal hoses to connect the branch pipe and the main pipe, and the connection between the two is not limited to bolt connection, and can also be connected by clamping, flange connection and the like.

[0030] Since there are generally multiple argon branch pipes and generally only one argon main pipe 9, during the connection process, the argon main pipe 9 is prone to shake due to the input and output of gas, which may damage the connection.

[0031] In order to improve the safety and reliability of gas use, in one embodiment, the continuous casting tundish cover argon blowing device also includes a main pipe bracket 8 for fixing the argon main pipe 9, and the main pipe bracket 8 is fixed on the edge step surface of the tundish 1, and the main pipe bracket 8 is used to limit the argon main pipe 9 and control the argon main pipe 9 to maintain a predetermined distance from the tundish 1.

[0032] By providing the main pipe support 8, the argon main pipe 9 can be fixed at a designated position at a designated height, thereby improving the efficiency and convenience of its installation. At the same time, the main pipe support 8 can be used to fix it so that the vibration generated during the gas transportation is absorbed by the main pipe support 8, thereby improving the reliability of gas supply.

[0033] The present application does not limit the arrangement and structure of the main support 8 .

[0034] In order to further improve the assembly efficiency and management efficiency, in one embodiment, the continuous casting mid-cover argon blowing device also includes a quick-connect joint 12 arranged at the front end of the air inlet of the argon main pipe 9, and the quick-connect joint 12 is connected to the air inlet of the argon main pipe 9 through a second metal hose 11, and is connected to the air outlet of a total flow meter 14 through a third metal hose 13. The total flow meter 14 is used to display the current blowing flow in real time. The quick-connect joint 12 is used to quickly connect or quickly separate the argon main pipe 9 and the gas source pipe 16. The gas source pipe 16 is provided with a ball valve 15 for controlling the opening degree of the output end of the gas source pipe 16 and adjusting the air intake of the argon main pipe 9. The ball valve 15 is located on the side of the total flow meter 14 away from the quick-connect joint 12.

[0035] By using the quick-connect joint 12, the argon main pipe 9 and the gas source pipe 16 can be quickly separated, so as not to affect the bag changing operation at the initial stage of pouring and after the pouring is completed.

[0036] The present application does not limit the type of the quick-connect connector 12 , the second metal hose 11 , the total flow rate, the ball valve 15 , etc.

[0037] In order to further achieve automatic control and improve control efficiency, in one embodiment, the argon blowing device for the continuous casting tundish cover further includes a display connected to the total flowmeter 14, the first flowmeter, the second flowmeter, and the third flowmeter, and a PLC controller connected to the ball valve 15, the first regulating valve, the second regulating valve, and the third regulating valve. The display is used to display the real-time detected flow rates of the total flowmeter 14, the first flowmeter, the second flowmeter, and the third flowmeter. The PLC controller is used to detect the opening degrees of the corresponding ball valve 15, the first regulating valve, the second regulating valve, and the third regulating valve according to control instructions.

[0038] By setting the display and the PLC controller, data can be displayed in real time and each regulating valve can be automatically adjusted, improving control efficiency.

[0039] In order to further achieve centralized management, in one embodiment, the argon blowing device for the continuous casting tundish cover further includes a communication module linked to the display and the PLC controller, which is used to output the display content of the display, output the opening degrees of the ball valve 15, the first regulating valve, the second regulating valve, and the third regulating valve, or receive external control instructions to control the opening degrees of the ball valve 15, the first regulating valve, the second regulating valve, and the third regulating valve. The communication module includes at least one of a 4G unit, a 5G unit, and a WiFi unit.

[0040] By setting the communication module, remote data transmission can be achieved, centralized management of several production workshops can be realized, and even centralized management can be carried out in the monitoring unit, improving the equipment maintenance efficiency.

[0041] In this application, the type and setting method of the communication module are not limited.

[0042] In this application, the distribution method and quantity of the argon branches of the first tundish cover 2, the second tundish cover 3, and the third tundish cover 4 of each tundish 1 are not limited. Generally, the number of the first cover argon branches 5 and the second cover argon branches 6 is 5 - 7, and the number of the second cover argon branches 6 is 7 - 10.

[0043] In this application, the argon branches in each cover can be independently set or fixed by a frame, and this application does not limit this.

[0044] In one embodiment, for the argon blowing device of the continuous casting tundish cover, before the tundish baking process, first hoist the tundish onto the tundish car, and then place the three tundish covers on the tundish in sequence. Place the argon main pipeline on the main pipeline support and connect it to the argon branches of the covers through metal hoses in sequence. After connection, perform the baking operation.

[0045] After the baking is completed, the middle bag and the bag cover are moved to the pouring station by the middle bag car, and the quick connector male end of the argon main inlet end is connected to the quick connector female end of the argon gas source outlet end. Through the above steps, the argon blowing device is fully assembled. Before pouring, fully open the ball valve in the gas source pipeline, and the argon gas flows through the main pipeline and the branch pipeline, and finally blows argon into the middle bag through the outlet of the branch pipe to quickly exhaust the air inside the middle bag. After blowing argon for about 2 minutes, pouring begins. At this time, adjust the opening of the ball valve to half open until the pouring is completed. After the pouring is completed, close the ball valve and disconnect the quick connector, and move the middle bag car to one side for cooling. After cooling, disconnect the metal hoses of the argon main pipeline and the argon branch pipeline, and remove the main pipeline for the next pouring. At this point, a complete use process of the argon blowing device is completed.

[0046] By using the flow meter and the ball valve together, the air intake can be controlled and monitored in real time to ensure that the required air volume matches the supplied air volume. On the one hand, it can improve the argon blowing protection effect, and on the other hand, it can also achieve the purpose of saving gas. The above device can blow argon to the molten steel during the pouring process, which can effectively reduce the contact between the molten steel and the air, improve the cleanliness of the molten steel, and ultimately improve the quality of the finished billet.

[0047] In summary, the argon blowing device for the continuous casting tundish cover provided in the embodiment of the utility model can effectively isolate high temperature and extend the service life of the device by arranging the argon branch pipe inside the tundish cover. The input end of the argon main pipe is connected to the gas source pipeline. During the continuous casting process, argon is blown into the tundish to replace the air therein, thereby reducing the contact between the molten steel and the air during the continuous casting process. During the pouring process, argon is blown to protect the molten steel, thereby improving the cleanliness of the molten steel and ultimately improving the quality of the cast billet. At the same time, argon branches are installed on the first cover, the second cover, and the third cover of the tundish respectively. The main pipe and the branch pipe can be separated, which is suitable for all tundish cover structures and improves the scope of use.

[0048] The above is a detailed introduction to the argon blowing device for the continuous casting ladle provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An argon blowing device for a continuous casting ladle cover, characterized in that: The invention comprises a tundish and a first cover, a second cover and a third cover of the tundish which are arranged in sequence from the first end to the second end above the tundish, and a first cover argon branch pipe passing through the first cover of the tundish, a second cover argon branch pipe passing through the second cover of the tundish and a third cover argon branch pipe passing through the third cover of the tundish. The first cover argon branch pipe, the second cover argon branch pipe and the third cover argon branch pipe are connected to an argon main pipe. The input end of the argon main pipe is connected to a gas source pipeline, so as to blow argon into the tundish during the continuous casting process to replace the air therein and reduce the contact between molten steel and air during the continuous casting process.

2. The argon blowing device for continuous casting ladle as claimed in claim 1, characterized in that: The angle between the gas outlet of the first cover argon branch pipe and the bottom of the first cover of the middle package, the angle between the gas outlet of the second cover argon branch pipe and the bottom of the second cover of the middle package, and the angle between the gas outlet of the third cover argon branch pipe and the bottom of the third cover of the middle package are 60°-90°, and the height difference between the gas outlet of the first cover argon branch pipe and the bottom of the first cover of the middle package, the height difference between the gas outlet of the second cover argon branch pipe and the bottom of the second cover of the middle package, and the height difference between the gas outlet of the third cover argon branch pipe and the bottom of the third cover of the middle package are 2-5cm.

3. The argon blowing device for continuous casting ladle as claimed in claim 2, characterized in that: It also includes a first flowmeter and a first regulating valve arranged on the first cover argon branch pipe, a second flowmeter and a second regulating valve arranged on the second cover argon branch pipe, and a third flowmeter and a third regulating valve arranged on the third cover argon branch pipe, wherein the first flowmeter is used to detect the gas flow through the first cover argon branch pipe, the first regulating valve is used to regulate the gas flow through the first cover argon branch pipe, the second flowmeter is used to detect the gas flow through the second cover argon branch pipe, the second regulating valve is used to regulate the gas flow through the second cover argon branch pipe, the third flowmeter is used to detect the gas flow through the third cover argon branch pipe, the third regulating valve is used to regulate the gas flow through the third cover argon branch pipe, the first cover argon branch pipe, the second cover argon branch pipe, the second cover argon branch pipe and the argon main pipe are connected via a first metal hose bolt.

4. The argon blowing device for continuous casting ladle as claimed in claim 3, characterized in that: It also includes a main pipe bracket for fixing the argon main pipe, the main pipe bracket is fixed on the step surface at the edge of the tundish, and the main pipe bracket is used to limit the argon main pipe and control the argon main pipe to maintain a predetermined distance from the tundish.

5. The argon blowing device for continuous casting ladle as claimed in claim 4, characterized in that: It also includes a quick-connect joint arranged at the front end of the air inlet of the argon main pipe, the quick-connect joint is connected to the air inlet of the argon main pipe through a second metal hose, and is connected to the air outlet of the total flow meter through a third metal hose. The total flow meter is used to display the current blowing flow in real time. The quick-connect joint is used to quickly connect or quickly separate the argon main pipe and the gas source pipeline. The gas source pipeline is provided with a ball valve for controlling the opening degree of the output end of the gas source pipeline and adjusting the air intake volume of the argon main pipe. The ball valve is located on the side of the total flow meter away from the quick-connect joint.

6. The argon blowing device for continuous casting ladle as claimed in claim 5, characterized in that: It also includes a display connected to the total flow meter, the first flow meter, the second flow meter, and the third flow, and a PLC controller connected to the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve. The display is used to display the real-time detection flow of the total flow meter, the first flow meter, the second flow meter, and the third flow, and the PLC controller is used to detect the opening of the corresponding ball valve, the first regulating valve, the second regulating valve, and the third regulating valve according to control instructions.

7. The argon blowing device for continuous casting ladle as claimed in claim 6, characterized in that: It also includes a communication module linked to the display and the PLC controller, which is used to output the display content of the display, output the opening of the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve, or accept external control instructions to control the opening of the ball valve, the first regulating valve, the second regulating valve, and the third regulating valve. The communication module includes at least one of a 4G unit, a 5G unit, and a WiFi unit.

8. The argon blowing device for continuous casting ladle according to any one of claims 1 to 7, characterized in that: The number of the first cover argon branch pipes and the second cover argon branch pipes is 5-7, and the number of the second cover argon branch pipes is 7-10.

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