An intermediate ladle and its lid argon blowing protection device

Abstract

This utility model discloses an argon blowing protection device for a tundish and its cover, relating to the field of metallurgical machinery technology. The argon blowing protection device includes an argon main pipe for connection to a gas source and at least one argon branch pipe fixed to the tundish cover. One end of the argon main pipe is connected to the gas source pipe, and the other end is connected to the argon branch pipe. The argon branch pipe has at least one argon branch pipe outlet, which extends in the normal direction to the bottom surface of the tundish cover. This argon blowing protection device can provide argon protection for molten steel during casting, using the blown-in argon gas to displace the air inside the tundish, significantly reducing the contact between air and molten steel during casting, and improving the purity of the molten steel and the yield properties of the cast steel billet.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical machinery technology, and more specifically, to a tundish-covered argon-blowing protection device. Furthermore, this utility model also provides an intermediate ladle including the aforementioned argon-blowing protection device. Background Technology

[0002] The tundish is the last container in the steelmaking process to hold molten steel. During the pouring process, the molten steel in the tundish is easily exposed to air, causing secondary oxidation of the molten steel and an increase in the oxygen content of the molten steel, which in turn affects the product properties of the steel billet.

[0003] In summary, how to reduce the contact between molten steel and air inside the inner tundish is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a ladle cover argon blowing protection device, which can use argon gas to replace the air inside the tundish, significantly reducing the contact between air and molten steel during the casting process, and improving the purity of molten steel and the product performance of steel billets.

[0005] In addition, this utility model also provides an intermediate jar including the above-mentioned argon blowing protection device with a cover.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An argon-blowing protection device for an intermediate package includes an argon main pipe for connection to a gas source and at least one argon branch pipe fixed to the package cover. One end of the argon main pipe is connected to a gas source pipeline, and the other end of the argon main pipe is connected to the argon branch pipe. The argon branch pipe has at least one argon branch pipe outlet, which extends in the normal direction to the bottom surface of the package cover.

[0008] Preferably, the number of argon gas branch pipes is the same as the number of cover plates of the cover, and the argon gas branch pipes and the cover plates are arranged in a one-to-one correspondence.

[0009] Preferably, the center of the argon gas branch pipe coincides with the center of the cover plate, and the outlet of the argon gas branch pipe is symmetrically arranged about the center of the cover plate.

[0010] Preferably, the cover includes a cover steel frame and an inner cover refractory material, the argon gas branch pipe is disposed between the cover steel frame and the cover refractory material, the argon gas branch pipe is connected to the bottom surface of the cover steel frame, and the outlet of the argon gas branch pipe protrudes from the lower surface of the cover refractory material.

[0011] Preferably, the argon gas branch pipe is welded to the bottom surface of the cover steel frame, and the welding points of the argon gas branch pipe are evenly distributed along the extension direction of the argon gas branch pipe.

[0012] Preferably, the bottom surface of the cover steel frame is provided with a slot or clamp for securing the argon gas branch pipe, and the slot or clamp is evenly distributed along the extension direction of the argon gas branch pipe.

[0013] Preferably, the axis of the argon gas branch outlet is perpendicular to the bottom surface of the cover, and the axis of the argon gas branch outlet is perpendicular to the axis of the argon gas branch.

[0014] Preferably, the argon gas branch pipe is connected to the argon gas main pipe via a flexible hose.

[0015] Preferably, the argon gas main pipe and the gas source pipeline are connected by a quick-release connector, and at least one end of the quick-release connector is connected to the argon gas main pipe and / or the gas source pipeline via a flexible hose.

[0016] An intermediate package includes an intermediate package body and a package cover, wherein the package cover is provided with the argon blowing protection device described in any of the above claims.

[0017] The argon blowing protection device provided by this utility model can blow argon gas that does not react with molten steel into the tundish. The argon gas replaces the air inside the tundish, which significantly reduces the contact between air, especially oxygen in the air, and molten steel during the casting process. This reduces secondary oxidation of molten steel, lowers the oxygen content of molten steel, improves the purity of molten steel, and ultimately improves the yield performance of steel billets.

[0018] In addition, this utility model also provides an intermediate jar including the above-mentioned argon blowing protection device with a cover. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of a specific embodiment of the argon blowing protection device with a cover provided by this utility model;

[0021] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0022] Figure 3 for Figure 1 A side view diagram.

[0023] Figures 1-3 middle:

[0024] 10-Cover; 101-Cover plate; 1-Argon branch pipe; 11-Argon branch pipe outlet; 2-First hose; 3-Argon main pipe; 4-Second hose; 5-Quick-release connector; 6-Gas source pipeline. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The core of this invention is to provide a ladle cover argon blowing protection device, which can use argon gas to replace the air inside the tundish, significantly reducing the contact between air and molten steel during the casting process, and improving the purity of molten steel and the product performance of steel billets.

[0027] In addition, this utility model also provides an intermediate jar including the above-mentioned argon blowing protection device with a cover.

[0028] The argon blowing protection device for the cover provided in this application is used in an intermediate package. It includes an argon main pipe 3 for connection to a gas source and at least one argon branch pipe 1 fixed to the cover 10. One end of the argon main pipe 3 is connected to a gas source pipe 6, and the other end of the argon main pipe 3 is connected to the argon branch pipe 1. The argon branch pipe 1 is provided with at least one argon branch pipe outlet 11 and the argon branch pipe 1 extends in the normal direction of the bottom surface of the cover 10.

[0029] It should be noted that the above-mentioned gas sources are not limited to argon gas sources, but also include other inert gases that do not react with molten steel, such as nitrogen and helium. However, nitrogen dissolves in molten steel and will affect the nitrogen content of the steel, so it cannot be used for the smelting of nitrogen-sensitive steels such as stainless steel. Helium has high production and storage costs, so the above-mentioned gas sources are usually set as argon gas sources.

[0030] Argon branch pipe 1 is used to introduce argon gas into the interior of the intermediate package, thereby displacing the air inside the intermediate package. In order to fix the argon branch pipe 1 to the package cover 10, only the surface of the package cover 10 is provided with a through branch pipe mounting hole, so that the argon branch pipe 1 can be connected and communicated with the argon main pipe 3 through the branch pipe mounting hole.

[0031] Of course, in order to prevent the argon branch pipe 1 from tilting downwards towards the side of the cover 10 without the branch pipe mounting hole under its own weight, it is preferable to connect the argon branch pipe 1 to the surface of the cover 10, such as the bottom surface and the inner surface. Specifically, the two can be welded together or snap-fitted together.

[0032] The material of the argon branch pipe 1 is determined according to the actual production needs. For example, since the temperature inside the tundish is high during the casting process, the argon branch pipe 1 should have good heat resistance to ensure the service life of the argon branch pipe 1 in high temperature environment. It is also preferable to have a heat insulation coating on the outer surface of the argon branch pipe 1.

[0033] The dimensions of the argon branch pipe 1, as well as the number and distribution of the argon branch pipe outlets 11 on the argon branch pipe 1, are determined based on the actual dimensions of the tundish and the dimensions and distribution of various functional holes such as injection holes and observation holes on the tundish cover 10 during production. This ensures that the air replacement efficiency is approximately the same throughout the tundish, avoids large local fluctuations in the oxygen content of the steel, which could affect the finished steel quality, and prevents the argon branch pipe 1 from interfering with the normal casting operation of the tundish.

[0034] The argon outlet 11 of the argon branch pipe 1 extends in the normal direction to the bottom surface of the cover 10 so that argon gas can be quickly introduced and replace the air inside the intermediate package; preferably, in order to shorten the movement path of argon gas and improve the air replacement efficiency, the axis of the argon outlet 11 is perpendicular to the bottom surface of the cover 10, and the axis of the argon outlet 11 is perpendicular to the axis of the argon branch pipe 1.

[0035] The argon gas outlet 11 can protrude from the bottom surface of the cover 10 or be connected to the outlet hole on the bottom surface of the cover 10, as long as it can ensure that the argon gas flows smoothly into the interior of the intermediate tundish.

[0036] One end of the argon main pipe 3 is connected to the argon branch pipe 1, and the other end is connected to the gas source pipe 6. In order to facilitate the inspection, maintenance and replacement of the pipeline, the two ends of the argon main pipe 3 are usually detachably connected to the argon branch pipe 1 and the gas source pipe 6 respectively. The detachable connection methods mentioned above specifically include threaded connection, quick-release connection and hose connection, etc.

[0037] The connection position between the argon branch pipe 1 and the argon main pipe 3 is determined by the position of the branch pipe mounting hole on the cover 10, while the position of the cover 10 is determined according to the actual placement position of the tundish during production. Considering that it is difficult to ensure that the placement position of the tundish remains unchanged during each casting process, it is preferable to connect the argon branch pipe 1 to the argon main pipe 3 through a flexible hose. The hose eliminates assembly errors between the two, facilitating quick connection between the argon branch pipe 1 and the argon main pipe 3. Figure 2 As shown.

[0038] The material of the hose is determined according to the actual production needs; specifically, it can be set as a rubber hose or a metal hose, possessing good flexibility and high-temperature resistance, for example... Figure 1 The first hose 2 shown is a metal hose.

[0039] Please refer to Figure 1 Before the baking process, place the bag cover 10 on the intermediate bag and set the argon gas main pipe 3 on the outer edge of the intermediate bag. Then connect the argon gas main pipe 3 to the gas source pipe 6 and the argon gas branch pipe 1 inside the bag cover 10 to complete the assembly of the bag cover argon blowing protection device.

[0040] Before the casting process begins, the flow control valve of the gas source is opened, and argon gas flows sequentially through the gas source pipeline 6, the argon main pipe 3 and the argon branch pipe 1, and is blown into the interior of the intermediate tundish through the argon branch pipe outlet 11 of the argon branch pipe 1 to quickly expel the air inside the intermediate tundish.

[0041] After the tundish is emptied, pouring begins. At this time, the opening of the gas source flow control valve is reduced to allow for pouring of molten iron at a lower argon flow rate until the pouring is completed. Then, the gas source flow control valve is disconnected. After the tundish cools down, the connection between the argon branch pipe 1 and the argon main pipe 3, as well as between the argon main pipe 3 and the gas source pipe 6, is disconnected. The argon main pipe 3 is then retracted for use in the next pouring.

[0042] It should be noted that during casting, a small flow rate of nitrogen is introduced into the tundish to maintain a low-oxygen environment and prevent the discharged air from flowing back into the tundish.

[0043] In this embodiment, the argon blowing protection device can blow argon gas, which does not react with molten steel, into the tundish. By using argon gas to replace the air inside the tundish, the contact between air, especially oxygen in the air, and molten steel during the casting process is significantly reduced. This reduces secondary oxidation of the molten steel, lowers the oxygen content of the molten steel, improves the purity of the molten steel, and ultimately improves the yield performance of the steel billet.

[0044] Preferably, the argon gas main pipe 3 and the gas source pipe 6 can be connected by a quick-release connector 5, and at least one end of the quick-release connector 5 is connected to the argon gas main pipe 3 and / or the gas source pipe 6 by a flexible hose.

[0045] Please refer to Figure 1 Argon main pipe 3 is connected to gas source pipe 6 through second hose 4 and quick-release connector 5. Since the position of gas source pipe 6 is relatively fixed, while the position of argon main pipe 3 will change depending on the placement position, second hose 4 can eliminate the assembly error of argon main pipe 3 and gas source pipe 6, which is conducive to the quick assembly and disassembly of the two.

[0046] The quick-release connector 5 enables quick separation of the argon main pipe 3 and the gas source pipe 6, reducing the need for changing the packaging during the initial and final stages of casting.

[0047] When the intermediate bale is small, a one-piece lid can meet its insulation and sealing requirements; however, for large or long intermediate briquettes, such as... Figure 1 and Figure 3 As shown, the one-piece cover is difficult to manufacture and the finished product is difficult to hoist. It is usually disassembled into several cover plates 101, which can be assembled into a complete cover 10.

[0048] Therefore, the number of argon gas branch pipes 1 can be set to be the same as the number of cover plates 101 of the cover 10, with argon gas branch pipes 1 and cover plates 101 set in a one-to-one correspondence.

[0049] Preferably, the center of the argon branch pipe 1 can be set to coincide with the center of the cover plate 101, and the outlet 11 of the argon branch pipe can be symmetrically arranged about the center of the cover plate 10, so as to facilitate the rapid blowing of argon into the intermediate package and replace the air in the intermediate package.

[0050] Based on the above embodiments, in order to improve the service life of the argon branch pipe 1, a cover 10 can be provided, including a cover steel frame and an inner cover refractory material. The argon branch pipe 1 is located between the cover steel frame and the cover refractory material. The argon branch pipe 1 is connected to the bottom surface of the cover steel frame, and the argon branch pipe outlet 11 protrudes from the lower surface of the cover refractory material.

[0051] Among them, the cover steel frame is a monitoring frame structure welded from steel plates and angle steel, channel steel and other shaped steel. It is the load-bearing skeleton of the cover 10, used to fix and support the cover refractory material, ensure the overall shape stability of the cover 10, and withstand external forces and structural stress under high temperature during hoisting.

[0052] The refractory material for the ladle cover is located on the inner side of the ladle cover steel frame. It can be formed by refractory brick masonry, integral casting of refractory castable, or tamping of refractory materials by manual or mechanical means. The refractory material for the ladle cover mainly serves the functions of heat insulation and sealing, reducing the temperature loss of molten steel and protecting the ladle cover steel frame from corrosion by high-temperature molten steel. At the same time, it seals the gap between the ladle cover 10 and the intermediate ladle body, reducing the secondary oxidation of molten steel.

[0053] In this embodiment, the argon gas branch pipe 1 is placed between the cover steel frame and the cover refractory material, which not only effectively fixes the argon gas branch pipe 1, but also uses the cover refractory material to protect most of the argon gas branch pipe 1 from corrosion by high-temperature molten steel, thereby improving the heat resistance and service life of the argon gas branch pipe 1.

[0054] When the refractory material is tamped during construction, preferably, in order to avoid the tamping material blocking the argon branch pipe outlet 11, the height of the argon branch pipe outlet 11 to the bottom surface of the refractory steel frame can be set to be greater than the thickness of the refractory material. For example, in a specific embodiment, the argon branch pipe outlet 11 is 10mm higher than the bottom surface of the refractory 10, so that the argon branch pipe outlet 11 protrudes from the surface of the refractory material.

[0055] The connection between the argon branch pipe 1 and the cover steel frame can be either that the argon branch pipe 1 is welded to the bottom surface of the cover steel frame, and the welding points of the argon branch pipe 1 are evenly distributed along the extension direction of the argon branch pipe 1.

[0056] Alternatively, the bottom surface of the cover steel frame may be provided with slots or clamps for securing the argon branch pipe 1, with the slots or clamps evenly distributed along the extension direction of the argon branch pipe 1.

[0057] Alternatively, the bottom surface of the cover steel frame can be equipped with several limiting posts, and the argon gas branch pipe 1 can be clamped between the limiting posts of the cover steel frame. The limiting posts are used to restrict the movement of the argon gas branch pipe 1 in the horizontal plane.

[0058] In addition to the aforementioned argon blowing protection device, this utility model also provides an intermediate package including the argon blowing protection device disclosed in the above embodiments. The intermediate package includes an intermediate package body and a cover 10. The cover 10 is provided with the argon blowing protection device disclosed in the above embodiments. The structure of other parts of the intermediate package can be referred to the prior art, and will not be described in detail here.

[0059] It should be noted that the "first" and "second" in the first hose 2 and the second hose 4 mentioned in this application are only used to distinguish the different positions and do not contain any limitation on the order.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The foregoing has provided a detailed description of the intermediate ladle and its argon blowing protection device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A cover-blowing argon protection device for intermediate ladle, characterized in that, It includes an argon main pipe (3) for connection to a gas source and at least one argon branch pipe (1) fixed to a cover (10). One end of the argon main pipe (3) is connected to a gas source pipe (6), and the other end of the argon main pipe (3) is connected to the argon branch pipe (1). The argon branch pipe (1) is provided with at least one argon branch pipe outlet (11), and the argon branch pipe outlet (11) extends in the normal direction of the bottom surface of the cover (10).

2. The argon blowing protection device with a cover according to claim 1, characterized in that, The number of argon gas branch pipes (1) is the same as the number of cover plates (101) of the cover (10), and the argon gas branch pipes (1) and the cover plates (101) are arranged in a one-to-one correspondence.

3. The argon blowing protection device with a cover according to claim 2, characterized in that, The center of the argon branch pipe (1) coincides with the center of the cover plate (101), and the outlet (11) of the argon branch pipe is symmetrically arranged about the center of the cover plate (10).

4. The argon blowing protection device with cover according to claim 1, characterized in that, The cover (10) includes a cover steel frame and an inner cover refractory material. The argon gas branch pipe (1) is located between the cover steel frame and the cover refractory material. The argon gas branch pipe (1) is connected to the bottom surface of the cover steel frame, and the argon gas branch pipe outlet (11) protrudes from the lower surface of the cover refractory material.

5. The argon blowing protection device with a cover according to claim 4, characterized in that, The argon gas branch pipe (1) is welded to the bottom surface of the cover steel frame, and the welding points of the argon gas branch pipe (1) are evenly distributed along the extension direction of the argon gas branch pipe (1).

6. The argon blowing protection device with a cover according to claim 4, characterized in that, The bottom surface of the cover steel frame is provided with a slot or clamp for securing the argon gas branch pipe (1), and the slot or clamp is evenly distributed along the extension direction of the argon gas branch pipe (1).

7. The argon-blowing protection device with a cover according to any one of claims 1-6, characterized in that, The axis of the argon gas branch outlet (11) is perpendicular to the bottom surface of the cover (10), and the axis of the argon gas branch outlet (11) is perpendicular to the axis of the argon gas branch (1).

8. The argon-blowing protection device with a cover according to any one of claims 1-6, characterized in that, The argon branch pipe (1) is connected to the argon main pipe (3) via a flexible hose.

9. The argon-blowing protection device with a cover according to any one of claims 1-6, characterized in that, The argon main pipe (3) and the gas source pipe (6) are connected by a quick-release connector (5), at least one end of which is connected to the argon main pipe (3) and / or the gas source pipe (6) via a flexible hose.

10. An intermediate package, characterized in that, It includes an intermediate package body and a cover (10), wherein the cover is provided with the argon blowing protection device as described in any one of claims 1-9.

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