Device for preventing secondary oxidation of molten steel in continuous casting ladle opening and pouring process

Abstract

The utility model relates to the technical field of steelmaking continuous casting, in particular to a device for preventing secondary oxidation of molten steel in the continuous casting ladle opening and pouring process. Comprising a steel ladle sleeve, a connecting sleeve, a supporting pipe and a ring pipe, the steel ladle sleeve is vertically arranged, and the top end of the steel ladle sleeve is arranged at a steel ladle collector nozzle in a sleeving mode. The connecting sleeve is fixedly connected to the top of the steel ladle sleeve; one end of the supporting pipe is connected with the connecting sleeve, the other end of the supporting pipe is communicated with the annular pipe, and the supporting pipe is communicated with an argon pipeline through the connecting pipe; the ring pipe surrounds the steel ladle sleeve, and a gas nozzle is arranged on the ring pipe. The molten steel can be prevented from being in contact with air when the continuous casting molten steel is opened at the casting position, so that the influence on the service life of steel caused by inclusion of large-particle oxides generated by secondary oxidation of the molten steel is avoided. The molten steel cleanliness and the molten steel stability can be controlled, and the molten steel quality can be improved.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking continuous casting technology, specifically a device for preventing secondary oxidation of molten steel during the continuous casting process. Background Technology

[0002] Continuous casting refers to the process of continuously pouring high-temperature liquid metal (such as molten steel) into a water-cooled crystallizer, where it solidifies to form an infinitely long billet. Compared with traditional ingot casting, continuous casting eliminates the steps of demolding and ingot cutting, significantly improving production efficiency and yield.

[0003] However, during the continuous casting process, when molten steel comes into contact with oxygen in the air, it increases the amount of oxides in the continuously cast billet and causes the molten steel to absorb nitrogen, which is not conducive to improving product quality and seriously limits the improvement of steel product qualification rate and stability control.

[0004] Therefore, preventing secondary oxidation of molten steel during continuous casting is a key research area. However, given the current state of development, some problems still need to be solved. For example, during the ladle opening and changing process, since the outlet of the ladle sleeve is located above the liquid level of the intermediate tank stabilizer, the molten steel will come into contact with air after the ladle is opened and when it falls to the normal pouring position. This leads to secondary oxidation of the molten steel, generating oxide inclusions. These inclusions are difficult to remove, and the secondary oxidation products remaining in the steel have adverse effects on the performance of the steel in terms of shape and size. They also deteriorate the cleanliness of the steel, which is not conducive to the control of the cleanliness and stability of the molten steel. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a device to prevent secondary oxidation of molten steel during the continuous casting process. This device avoids contact between molten steel and air when the ladle is opened at the casting position, thereby preventing the formation of large-particle oxide inclusions that could affect the service life of the steel due to secondary oxidation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for preventing secondary oxidation of molten steel during continuous casting includes a ladle sleeve, a connecting sleeve, a support pipe, and a ring pipe. The ladle sleeve is vertically arranged, with its top end fitted over the ladle outlet. The connecting sleeve is fixed to the top of the ladle sleeve. One end of the support pipe is connected to the connecting sleeve, and the other end is connected to the ring pipe. The support pipe is also connected to an argon gas pipeline via the connecting pipe. The ring pipe surrounds the ladle sleeve and is equipped with a gas nozzle.

[0008] Furthermore, there are four or more support tubes, which are evenly distributed around the circumference.

[0009] Furthermore, a valve is provided on the connecting pipe.

[0010] Furthermore, there are more than 10 gas nozzles, evenly distributed around the circumference.

[0011] Furthermore, it also includes a support frame and a hydraulic cylinder. One end of the support frame is connected to the connecting sleeve, and the other end is connected to the hydraulic cylinder. The hydraulic cylinder extends and retracts to drive the device to rise and fall.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The ladle sleeve of this utility model is vertically arranged, with its top end fitted over the ladle's outlet. A ring pipe surrounds the ladle sleeve, and a downward-facing gas nozzle is installed on the ring pipe, which is connected to an argon gas pipeline. At this point, the molten steel flowing out of the ladle sleeve at the pouring position is within an argon atmosphere, preventing contact between the molten steel and air. This avoids oxidation reactions between oxygen in the air and the molten steel, eliminating the formation of large-particle oxide inclusions from oxidation reactions. This facilitates the control of molten steel cleanliness and stability, ultimately improving steel quality.

[0014] 2. This utility model has four or more support tubes, evenly distributed around the circumference; and ten or more gas nozzles, evenly distributed around the circumference. Mechanical properties and manufacturing process are optimized.

[0015] 3. The support frame and hydraulic cylinder of this utility model form a hydraulic lifting device, which is lifted and lowered by hydraulic power, and the movement is smooth and can be precisely controlled. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the working state of this utility model.

[0017] Figure 2 This is a schematic front view of the structure of this utility model.

[0018] Figure 3 This is a top view illustrating the structure of this utility model.

[0019] In the diagram: 1. Ladle; 2. Ladle sleeve; 3. Hydraulic cylinder; 4. Support pipe; 5. Ring pipe; 6. Ladle drain outlet; 7. Connecting pipe; 8. Valve; 9. Argon gas pipeline; 10. Connecting sleeve; 11. Gas nozzle. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 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 this utility model based on the specific circumstances.

[0023] In the description of this utility model, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0026] like Figure 1-3 As shown, a device for preventing secondary oxidation of molten steel during the continuous casting process includes a ladle sleeve 2, a connecting sleeve 10, a support pipe 4, and a ring pipe 5.

[0027] The steel ladle sleeve 2 is installed vertically, with its top end fitted onto the steel ladle drain outlet 6, and the steel ladle sleeve 2 is fitted onto the outside of the steel ladle drain outlet 6.

[0028] The connecting sleeve 10 is fixed to the top of the steel ladle sleeve 2, and the connecting sleeve 10 is sleeved on the outside of the steel ladle sleeve 2.

[0029] This embodiment features four support tubes 4, which support the ring tube 5. The four support tubes 4 are evenly distributed around the circumference, optimizing mechanical properties and manufacturing process. The top end of each support tube 4 is connected to the connecting sleeve 10, and the bottom end is connected to the ring tube 5.

[0030] The support pipe 4 is connected to the argon gas pipeline 9 through the connecting pipe 7. The connecting pipe 7 is equipped with a valve 8 to realize the opening and closing of the argon gas.

[0031] The annular pipe 5 surrounds the steel ladle sleeve 2, and the annular pipe 2 is equipped with downward-facing gas nozzles 11. There are more than 10 gas nozzles 11, evenly distributed around the circumference, to optimize mechanical properties and manufacturing process.

[0032] It also includes a support frame and a hydraulic cylinder 3. One end of the support frame is connected to the connecting sleeve 10, and the other end is connected to the hydraulic cylinder 3. The hydraulic cylinder extends and retracts to drive the device to rise and fall. The device is raised and lowered by hydraulic power, and the movement is smooth and can be precisely controlled.

[0033] The working principle and process of this utility model are as follows:

[0034] 1. After the continuous casting ladle 1 is rotated to the working position, the ladle sleeve 2 is moved to the bottom of the ladle outlet 6, so that the upper opening of the ladle sleeve 2 is aligned with the bottom of the ladle outlet 6. The ladle sleeve 2 is raised by the hydraulic cylinder 3, and the top of the ladle sleeve 2 is inserted into the bottom of the ladle outlet 6, so that the bottom of the ladle outlet 6 and the ladle sleeve 2 are in contact.

[0035] 2. Open valve 8, and argon gas is sprayed through gas nozzle 11 to the lower outlet of steel ladle sleeve 2, forming an argon protective atmosphere near the outlet of steel ladle sleeve to isolate air. At the same time, steel ladle 1 is lowered to the open position, at which time the outlet of steel ladle sleeve is above the liquid surface of the intermediate tank flow stabilizer.

[0036] 3. Open the ladle slide plate to allow the diversion sand blocking the molten steel to flow into the ladle sleeve 2 through the ladle outlet 6, and then into the flow stabilizer through the ladle sleeve 2. After the diversion sand flows out, the molten steel will follow. Since an argon protective atmosphere has been formed at the outlet of the ladle sleeve and below it at this time, the molten steel can be prevented from contacting the air.

[0037] 4. After the molten steel successfully flows out, the ladle 1 is lowered to the normal pouring position. At this time, the lower part of the ladle sleeve is inserted into the molten steel in the flow stabilizer. Since there is a covering agent layer above the molten steel in the flow stabilizer, the covering agent can prevent air from contacting the molten steel. Therefore, the molten steel flowing out through the ladle sleeve 2 is no longer in contact with the air.

[0038] 5. After the ladle 1 is lowered to the normal pouring position, close valve 8.

[0039] This invention can prevent the formation of large-particle oxide inclusions generated by oxidation reactions, which is beneficial for controlling the cleanliness and stability of molten steel and improving the quality of molten steel.

[0040] The above description is only a part of the specific embodiments of this utility model. The protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and utility model concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A device for preventing secondary oxidation of molten steel during continuous casting ladle opening pouring process, characterized in that: it comprises a ladle sleeve, a connecting sleeve, a support pipe and a ring pipe; the ladle sleeve is vertically arranged, with its top end sleeved at the ladle nozzle; the connecting sleeve is fixedly connected to the top of the ladle sleeve; one end of the support pipe is connected to the connecting sleeve, and the other end is connected to the ring pipe in communication; the support pipe is connected to the argon pipeline through a connecting pipe; the ring pipe surrounds the ladle sleeve, and gas nozzles are arranged on the ring pipe.

2. The device according to claim 1, characterized in that: the support pipe is more than four, and is arranged in a circumferential distribution.

3. The device according to claim 1, characterized in that: a valve is arranged on the connecting pipe.

4. The device according to claim 1, characterized in that: the gas nozzles are more than ten, and are arranged in a circumferential distribution.

5. The device according to claim 1, characterized in that: it further comprises a support frame and a hydraulic cylinder, one end of the support frame is connected to the connecting sleeve, and the other end is connected to the hydraulic cylinder, the hydraulic cylinder is extended and retracted to drive the device to rise and fall. ​ ​ ​ ​ ​ ​ ​ ​ ​

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