Argon blowing device for protecting pouring of continuous casting tundish

Abstract

The utility model relates to the technical field of metallurgy continuous casting, in particular to an argon blowing device for protecting pouring of a continuous casting tundish, which comprises the tundish and an argon blowing pipe, one end of the argon blowing pipe extends into the tundish, the other end of the argon blowing pipe is connected with an argon supply pipe, the argon blowing pipe comprises a main argon blowing pipe, one end of the main argon blowing pipe is connected with the argon supply pipe, and the other end of the main argon blowing pipe is connected with the tundish. A plurality of branch pipelines are arranged at the other end of the pipe body, each branch pipeline is of an L-shaped structure, an elbow is arranged at the end of each branch pipeline, and air outlet holes are formed in the two ends of each elbow respectively. According to the utility model, the argon is blown into the tundish by adopting the design of the branch pipelines, so that the argon can quickly cover the molten steel surface of the tundish, the argon parallel to the molten steel surface is prevented from being blown into the tundish, the gas is prevented from overflowing, the utilization rate of the argon is improved, and the production cost is reduced.

Description

Technical Field

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

[0002] Steel enterprises are prone to generate Al2O3 inclusions in the process of producing aluminum-containing steel, which can easily lead to floccules in the nozzle eye during continuous casting, affecting the stability of the crystallizer liquid level and the quality of the ingot. As we all know, the purity and castability of the molten steel entering the crystallizer must be guaranteed during casting. In addition to the high requirements for the quality of the molten steel, the protective pouring of the continuous casting tundish is also a top priority, especially when pouring special steels. Conventional tundish protective pouring adopts the method of tundish covering agent + large ladle long nozzle argon sealing. After the large ladle is poured, the molten steel flows into the impact zone in a tumbling shape, and entering the pouring zone increases the frequency of contact between the molten steel surface and the air. The secondary oxidation of the molten steel is serious. Simply relying on covering agents can no longer meet the requirements of tundish pouring.

[0003] In recent years, those skilled in the art have proposed to design and use a tundish argon blowing device to continuously blow argon on the tundish liquid surface to form a layer of argon protective film, effectively reduce the frequency of contact between molten steel and air, and achieve the purpose of reducing the secondary oxidation of molten steel and improving the protective casting effect. For example, the patent CN207479546U discloses a ventilation duct for continuous tundish argon blowing protection, including an outlet duct, an intermediate duct, a connecting thread, and a right-angle two-way. The outlet holes are evenly distributed on the side of the head of the outlet duct, and the blowing direction is parallel to the molten steel surface. The head of the vent duct outlet duct adopts a side hole uniform distribution design, which avoids the direct blowing to the molten steel surface due to the straight-through duct type, destroying the stability of the molten steel surface in the tundish, and effectively preventing the molten steel in the tundish from rolling slag. However, the argon blown out of each ventilation duct is limited and cannot quickly cover the molten steel surface in the tundish, and the outlet holes of the ventilation duct blow argon parallel to the molten steel surface, which is easy to cause the argon to blow directly to the wall of the tundish, causing the argon to overflow upward along the direction of the cover, resulting in low argon utilization and increased production costs. Utility Model Content

[0004] The embodiment of the utility model provides an argon blowing device for continuous casting tundish protection pouring, so as to achieve the technical effect of preventing argon gas from overflowing upward along the direction of the tundish cover.

[0005] One aspect of the implementation of the utility model provides an argon blowing device for continuous casting tundish protection pouring, comprising a tundish and an argon blowing pipe, one end of the argon blowing pipe extends into the tundish, and the other end is connected to the argon gas supply pipe. The argon blowing pipe comprises an argon blowing main pipe, one end of the argon blowing main pipe is connected to the argon gas supply pipe, and the other end is provided with a plurality of branch pipelines, the branch pipeline is an L-shaped structure, and the end of each branch pipeline is respectively provided with an elbow, and both ends of the elbow are respectively provided with air outlet holes.

[0006] Compared with the prior art, the beneficial effects of the present invention are:

[0007] The utility model adopts the design of branch pipeline to blow argon into the tundish, so as to avoid the problem that the argon flow rate of the single argon pipe is low and the steel liquid level in the tundish cannot be quickly covered; an elbow is arranged at the end of the branch pipeline, and gas outlet holes are opened on both sides of the elbow, so as to avoid blowing argon parallel to the steel liquid level into the tundish, prevent gas overflow, improve the utilization rate of argon and reduce production costs.

[0008] Further, the preferred solution adopted by the utility model is:

[0009] The outlets at both ends of the elbow are designed to be 5° downward to avoid the argon gas from the outlet being blown directly to the non-plugging hole wall of the tundish cover, resulting in low argon utilization and waste.

[0010] Two adjacent branch pipelines are connected by supporting round steel to improve the strength between the two adjacent branch pipelines, and can play a supporting role when subjected to horizontal forces to prevent structural deformation or damage between the argon blowing pipes.

[0011] The center point of the elbow is 10mm vertically downward from the liquid surface.

[0012] Two branch pipes of different lengths are arranged on the argon blowing main pipe, and the two branch pipes are connected to the argon blowing main pipe through a three-way joint. The branch pipes of different lengths can make the elbows staggered to successfully avoid the collision of argon gas streams, so that the argon gas alternately covers the molten steel surface. The shorter branch pipe is blown in first, and the longer one is blown in later, so that there is no dead angle in the tundish, and the argon gas quickly covers the molten steel surface.

[0013] The argon blowing main pipe is a stainless steel corrugated hose, and quick-release connectors are respectively provided at both ends of the argon blowing main pipe. One end of the argon blowing main pipe is connected to the three-way connector through the quick-release connector, and the other end of the argon blowing main pipe is connected to the argon gas supply pipe through the quick-release connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the argon blowing tube;

[0017] Figure 3 It is a structural schematic diagram of the branch pipeline;

[0018] In the figure: argon blowing main pipe 1; quick-release joint 2; tee joint 3; branch pipe 4; supporting round steel 5; elbow 6; gas outlet 7; non-plugging hole 8; tundish 9. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the implementation mode and the accompanying drawings. Here, the schematic implementation mode of the utility model and its description are used to explain the utility model, but are not used as a limitation of the utility model.

[0020] An argon blowing device for continuous casting tundish protection pouring, such as Figure 1 As shown, it is composed of a tundish 9 and an argon blowing pipe, one end of the argon blowing pipe extends into the non-stopper hole 8 of the tundish 9, and the other end is connected to the argon gas supply pipeline.

[0021] like Figure 2 , Figure 3 As shown, the argon blowing pipe includes an argon blowing main pipe 1, which is a stainless steel corrugated hose. Quick connectors 2 are respectively provided at both ends of the argon blowing main pipe 1. The quick connector 2 at one end of the argon blowing main pipe 1 is connected to a three-way connector 3; the quick connector 2 at the other end of the argon blowing main pipe 1 is connected to an argon gas supply pipe.

[0022] The argon blowing main pipe 1 is connected with two branch pipes 4 of different lengths through a three-way joint 3. The branch pipe 4 is an L-shaped structure. Elbows 6 are respectively welded at one end of the two branch pipes 4 away from the three-way joint 3. The center point of the elbow 6 is 10 mm vertically downward from the liquid surface; gas outlet holes 7 are respectively opened at both ends of the elbow 6. The argon gas in the branch pipe 4 is blown into the middle package 9 in two directions at the elbow 6, and the gas outlet holes 7 at both ends of each elbow 6 are respectively designed to be 5° downward to avoid the argon gas in the gas outlet hole 7 from being directly blown to the hole wall of the non-plug rod hole 8 of the cover of the middle package 9 and overflowing, resulting in low utilization and waste of argon gas.

[0023] In the present embodiment, the two branch pipes 4 on the same argon blowing main pipe 1 are arranged in two forms of different lengths, so that the elbows 6 on the branch pipes 4 can be staggered, thereby avoiding the collision of the argon gas streams blown out between the two opposite elbows 6 on the two branch pipes 4, and generating two branch streams. The upward stream rushes out of the non-plug rod hole 8 to cause waste, and the downward stream vertically impacts the molten steel surface, causing the molten steel to be exposed for secondary oxidation, so that the argon gas alternately covers the molten steel surface, and the shorter branch pipe 4 is blown in first, and the longer one is blown in later, so that there is no dead angle in the middle bag 9, so that the argon gas quickly covers the molten steel surface.

[0024] Two adjacent branch pipelines 4 are connected by supporting round steel bars 5 to improve the strength between the double argon blowing pipes, and to play a supporting role when subjected to horizontal forces, thereby preventing structural deformation or damage between the argon blowing pipes.

[0025] In this embodiment, the longer of the two branch pipelines 4 is 1060 mm, and the shorter one is 860 mm, and the horizontal straight line distance between the two branch pipelines 4 is 100 mm.

[0026] When the device is in use, one end of the argon blowing pipe with the elbow 6 is placed into the non-stopper hole 8 of the tundish 9. During installation, ensure that the branch pipeline 4 is vertical to the non-stopper hole 8 and the elbow 6 respectively. After placement, connect the argon blowing main pipe 1 and the argon gas supply pipe. After the argon passes through the argon main pipe 1, it is divided into two streams at the three-way joint 3 and enters the branch pipeline 4. Finally, it is divided into another direction at the elbow 6 and blown into the tundish to form an argon protective layer, which has the effect of isolating the air and preventing secondary oxidation.

[0027] The device has a simple structure and is easy to operate. It is convenient to load and unload through the quick-release joint. The double elbow staggered argon blowing design with the air outlet 5° downward successfully avoids many disadvantages of a single argon blowing tube, making large and small tundishes universal, that is, meeting the continuous use of multiple tundish castings, and has significant economic benefits.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An argon blowing device for continuous casting tundish protection pouring, comprising a tundish and an argon blowing pipe, one end of the argon blowing pipe extends into the tundish, and the other end is connected to an argon gas supply pipeline, characterized in that: The argon blowing pipe includes an argon blowing main pipe, one end of which is connected to the argon gas supply pipe, and the other end is provided with a plurality of branch pipes, the branch pipes are of L-shaped structure, the end of each branch pipe is provided with an elbow, and both ends of the elbow are provided with air outlets.

2. The argon blowing device for continuous casting tundish protection pouring according to claim 1, characterized in that: The air outlets at both ends of the elbow are directed downward 5°.

3. The argon blowing device for continuous casting tundish protection pouring according to claim 1, characterized in that: Two adjacent branch pipelines are connected by supporting round steel.

4. The argon blowing device for continuous casting tundish protection pouring according to claim 1, characterized in that: The center point of the elbow is 10mm vertically downward from the liquid surface.

5. The argon blowing device for continuous casting tundish protection pouring according to claim 1, characterized in that: Two branch pipelines with different lengths are arranged on the argon blowing main pipe, and the two branch pipelines are connected to the argon blowing main pipe through a three-way joint.

6. The argon blowing device for continuous casting tundish protection pouring according to claim 5, characterized in that: The argon blowing main pipe is a stainless steel corrugated hose, and quick-release connectors are respectively provided at both ends of the argon blowing main pipe. One end of the argon blowing main pipe is connected to the three-way connector through the quick-release connector, and the other end of the argon blowing main pipe is connected to the argon gas supply pipe through the quick-release connector.

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