Double-argon-seal continuous casting nozzle system
By setting up an argon sealing tank and an argon gas channel in the water outlet system where the steel water flows into the crystallizer, an argon protection gas curtain is formed, which solves the problems of secondary oxidation of the steel water and inclusion of the steel billet surface, and realizes the entire isolation and protection of the steel water pouring process.
Patent Information
- Application Number
- CN202322630570.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2033-09-27
AI Technical Summary
In the prior art, secondary oxidation occurs when the steel water flows into the crystallizer, resulting in problems such as vibration of the immersion water port, bubbling of the steel liquid in the crystallizer, and inclusion of the steel billet surface.
A double argon seal continuous casting water outlet system is adopted. By setting an argon sealing groove on the skateboard surfaces of the water outlet and the immersion water outlet, and using the design of air inlet, connection channel and exhaust hole, two layers of argon protection air curtains are formed to isolate the air and protect the pouring process of the steel.
It effectively avoids the vibration, liquid level fluctuation, bubble and other problems caused by argon gas entering the water outlet cavity and entering the crystallizer together with the liquid steel. It eliminates the secondary oxidation of the steel water and significantly reduces the surface of the billet.
Smart Images
Figure CN222660114U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a double argon sealed continuous casting nozzle system. Background Art
[0002] The molten steel flows from the tundish through the upper water inlet - the inner cavity of the immersion nozzle to the crystallizer, with a flow rate of about 4~5m / s, causing a negative pressure environment around it. There are inevitably micro gaps between the slide surfaces, which will suck air into the inner cavity of the nozzle, causing secondary oxidation of the molten steel, vibration of the immersion nozzle, bubbling of the molten steel in the crystallizer, and even inclusions on the surface of the billet. Summary of the invention
[0003] The utility model aims to solve the shortcomings in the prior art and proposes a double argon sealed continuous casting nozzle system.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A double argon-sealed continuous casting nozzle system comprises an upper nozzle for continuous casting and an immersion nozzle, wherein the upper nozzle is used in conjunction with the immersion nozzle, the upper nozzle is fixedly mounted on the bottom of the continuous casting tundish, the immersion nozzle receives the molten steel flowing down from the tundish through the upper nozzle and enters the crystallizer, the bottom surface of the upper nozzle and the upper surface of the immersion nozzle are both provided with slide surfaces, and the two are closely connected through the slide surfaces, argon sealing groove 1 and argon sealing groove 2 are respectively provided on the slide surfaces of the upper nozzle and the immersion nozzle, sealing blocks are provided on the argon sealing groove 1 and the argon sealing groove 2, wherein an air inlet is provided on the side surface of the upper nozzle slide, and is connected to the argon sealing groove 1 through a connecting hole, a connecting channel connected to the argon sealing groove 2 is provided on the inner side, and an air outlet is provided on the outer side of the argon sealing groove 2.
[0006] The utility model further defines the technical solution:
[0007] Preferably, the diameter of the first argon sealing groove is smaller than the diameter of the second argon sealing groove.
[0008] Preferably, the connecting hole is L-shaped.
[0009] Preferably, the length of the connecting channel is greater than or equal to the difference between the inner diameter of the second argon sealing tank and the outer diameter of the first argon sealing tank.
[0010] Preferably, the connecting channel and the exhaust hole are respectively located on both sides of the sealing block on the second argon-argon sealing groove, and the angle between the connecting channel and the exhaust hole is less than 90°.
[0011] Preferably, an argon blowing nozzle is installed on the air inlet.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] The utility model has a simple structure and is easy to operate. When the nozzle is used, argon gas is introduced from the air inlet of the upper nozzle with an argon blowing nozzle, goes around the argon sealing groove one by one, enters the argon sealing groove of the submerged nozzle through the connecting channel, and is discharged from the two exhaust holes of the argon sealing groove after flowing through one circle. Two layers of argon protective air curtains are formed on the contact surface of the upper nozzle and the submerged nozzle. The process of molten steel from the tundish to the crystallizer can be isolated from air, and the pouring is protected throughout the process. At the same time, argon gas is prevented from entering the inner cavity of the nozzle and entering the crystallizer together with the molten steel, causing the vibration of the submerged nozzle, the fluctuation of the crystallizer liquid level, the bubbling of the molten steel in the crystallizer and other problems, thereby preventing the secondary oxidation of molten steel and significantly reducing the inclusions on the surface of the billet. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model;
[0015] Figure 2 It is a structural schematic diagram of the joint surface between the upper water inlet and the immersed water inlet of the utility model. Implementation
[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0017] Reference Figure 1-2 A double argon-sealed continuous casting nozzle system, comprising an upper nozzle 1 for continuous casting and an immersion nozzle 2, the upper nozzle and the immersion nozzle are used in conjunction with each other, the upper nozzle is fixedly installed at the bottom of the continuous casting tundish, the immersion nozzle receives the molten steel flowing down from the tundish through the upper nozzle and enters the crystallizer, the bottom surface of the upper nozzle and the upper surface of the immersion nozzle are both provided with a slide surface 3, and the two are closely connected through the slide surface, an argon sealing groove 1 4 and an argon sealing groove 2 5 are respectively provided on the slide surfaces of the upper nozzle and the immersion nozzle, the diameter of the argon sealing groove 1 is smaller than the diameter of the argon sealing groove 1 The diameter of the argon sealing groove 1 and the argon sealing groove 2 are both provided with sealing blocks 10, wherein an air inlet 6 with an argon blowing nozzle is provided on the side of the upper water inlet slide plate, and is connected with the argon sealing groove 1 through an L-shaped connecting hole 9, and a connecting channel 7 connected thereto is provided on the inner side of the argon sealing groove 2, and the length of the connecting channel is equal to the difference between the inner diameter of the argon sealing groove 2 and the outer diameter of the argon sealing groove 1, and an exhaust hole 8 is provided on the outer side of the argon sealing groove 2, and the connecting channel and the exhaust hole are respectively located on both sides of the sealing block on the argon sealing groove 2, and the angle between the connecting channel and the exhaust hole is 45°.
[0018] The structure is simple and the operation is easy. When the nozzle is used, argon gas is introduced from the air inlet with an argon blowing nozzle on the upper nozzle, goes around the argon sealing groove one by one, enters the argon sealing groove of the submerged nozzle through the connecting channel, and is discharged from the two exhaust holes of the argon sealing groove after flowing through one circle. A two-layer argon protective gas curtain is formed on the contact surface between the upper nozzle and the submerged nozzle. The process of molten steel from the tundish to the crystallizer can be isolated from the air, and the pouring is protected throughout the process. At the same time, argon gas is prevented from entering the inner cavity of the nozzle and entering the crystallizer together with the molten steel, causing vibration of the submerged nozzle, fluctuation of the crystallizer liquid level, bubbling of the molten steel in the crystallizer and other problems, thereby preventing the secondary oxidation of molten steel and significantly reducing inclusions on the surface of the billet.
[0019] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "top", "middle", "another", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A double argon sealed continuous casting nozzle system, comprising an upper nozzle for continuous casting and an immersion nozzle, wherein the upper nozzle is used in conjunction with the immersion nozzle, the upper nozzle is fixedly mounted at the bottom of the continuous casting tundish, and the immersion nozzle receives the molten steel flowing from the tundish through the upper nozzle into the crystallizer, characterized in that: The bottom surface of the upper water inlet and the upper surface of the immersion water inlet are both provided with a slide surface, and the two are closely connected through the slide surface, and argon sealing groove 1 and argon sealing groove 2 are respectively provided on the slide surfaces of the upper water inlet and the immersion water inlet, and sealing blocks are provided on the argon sealing groove 1 and the argon sealing groove 2, wherein an air inlet hole is provided on the side surface of the upper water inlet slide, and is connected with the argon sealing groove 1 through a connecting hole, a connecting channel connected to the argon sealing groove 2 is provided on the inner side of the argon sealing groove 2, and an exhaust hole is provided on the outer side of the argon sealing groove 2.
2. A double argon sealed continuous casting nozzle system according to claim 1, characterized in that: The diameter of the first argon sealing groove is smaller than the diameter of the second argon sealing groove.
3. The double argon sealed continuous casting nozzle system according to claim 1, characterized in that: The connecting hole is L-shaped.
4. A double argon sealed continuous casting nozzle system according to claim 1, characterized in that: The length of the connecting channel is greater than or equal to the difference between the inner diameter of the second argon sealing tank and the outer diameter of the first argon sealing tank.
5. The double argon sealed continuous casting nozzle system according to claim 1, characterized in that: The connecting channel and the exhaust hole are respectively located on both sides of the sealing block on the second argon-argon sealing groove, and the angle between the connecting channel and the exhaust hole is less than 90°.
6. A double argon sealed continuous casting nozzle system according to claim 1, characterized in that: An argon blowing nozzle is installed on the air inlet.