Protective device for upper nozzle of tundish

Abstract

The utility model discloses a protective device for a tundish upper nozzle. The technical problem that in the prior art, an upper nozzle is poor in air permeability is solved. The protection device comprises a limiting plate arranged on the contraction section of the upper nozzle, the projection area of the limiting plate in the vertical direction is larger than the cross section area of the body section, and the limiting plate is provided with a through hole; the upper end of the protection tube is connected to the limiting plate, a tube cavity of the protection tube is communicated with the through hole and arranged in the body section at intervals, and the lower end of the protection tube extends out of the body section. The protection device provided by the utility model can protect materials in the transition area when the materials are scattered, and the materials are prevented from being adhered to the inner wall of the upper nozzle in the baking stage, so that the air permeability of the upper nozzle is improved.

Description

Technical Field

[0001] This application belongs to the technical field of tundish upper nozzle protection, and specifically relates to a protection device for the tundish upper nozzle. Background Art

[0002] During the repair and ramming process of the continuous casting tundish, first, the upper nozzle is installed at the bottom of the tundish body. After the installation of the tundish upper nozzle is completed, then the permanent layer and the working layer are rammed in the tundish. Powdered material is scattered at the connection position between the upper nozzle and the tundish body and tamped with tools. Finally, it is baked to complete the repair of the tundish. Finally, the lower nozzle is connected to the upper nozzle to form a complete tundish.

[0003] Due to the easy scattering and dusting of the powdered material during the material scattering process, the falling point is difficult to control, and the powdered material will enter the upper nozzle. The inner wall of the upper nozzle will adsorb the scattered material, and the scattered material contains a binder. The upper nozzle body must have the characteristics of dispersion and permeability. If the upper nozzle adsorbs the scattered material containing the binder and is not thoroughly cleaned, during the subsequent baking process of the tundish, the hot gas and water vapor during the ramming process of the tundish working layer are discharged from the upper nozzle, and the powdered material will be solidified on the inner wall of the upper nozzle under the action of the hot gas and water vapor, thereby reducing the air permeability of the upper nozzle and affecting the production stability during the continuous casting production process. Summary of the Invention

[0004] To solve the technical problem of reducing the air permeability of the tundish upper nozzle during the current tundish repair process, this application provides a protection device for the tundish upper nozzle.

[0005] This application provides a protection device for the tundish upper nozzle. The upper nozzle includes a connected body section and a contraction section. The contraction section is connected to the tundish body. The protection device includes:

[0006] A limiting plate is arranged on the contraction section of the upper nozzle, and the projected area of the limiting plate in the vertical direction is larger than the cross-sectional area of the body section. The limiting plate is provided with a through hole;

[0007] A protection tube, the upper end of the protection tube is connected to the limiting plate, the lumen of the protection tube is communicated with the through hole, and it is arranged at intervals within the body section, and the lower end of the protection tube extends out of the body section.

[0008] In some embodiments, the outer diameter of the upper end of the protection tube decreases sequentially in the direction from top to bottom.

[0009] In some embodiments, the outer diameter of the limiting plate is the same as the maximum diameter of the contraction section; the limiting plate is a steel plate, the protection tube is a steel pipe, and the steel plate is welded to the steel pipe.

[0010] In some embodiments, the inner diameter of the upper end of the protective tube is the same as the inner diameter of the through hole.

[0011] In some embodiments, the length of the protective tube is 450 - 550 mm.

[0012] In some embodiments, an elastic sleeve is further included, and the elastic sleeve is wrapped around the protective tube.

[0013] In some embodiments, the elastic sleeve is a high-temperature resistant silica gel sleeve.

[0014] In some embodiments, there are two elastic sleeves, and the two elastic sleeves are respectively sleeved on the upper end and the lower end of the protective tube.

[0015] In some embodiments, an elastic ring for contacting the cavity wall of the contraction section is further included. The elastic ring is connected to the limiting plate and sleeved outside the protective tube.

[0016] In some embodiments, a mounting ring and a pull ring are further included. The mounting ring is connected to the limiting plate, and the pull ring is mounted on the mounting ring.

[0017] According to the protection device for the upper nozzle of the tundish provided by the embodiment of the present application, it is used to protect the upper nozzle. The upper nozzle includes a connected body section and a contraction section. The contraction section is connected to the tundish body. The protection device includes a limiting plate and a protective tube. The limiting plate is arranged in the contraction section of the upper nozzle, and the projected area of the limiting plate in the vertical direction is larger than the cross-sectional area of the body section. The limiting plate is provided with a through hole. The upper end of the protective tube is connected to the limiting plate, the tube cavity of the protective tube is communicated with the through hole, and the protective tube is arranged at intervals in the body section, and the lower end of the protective tube extends out of the body section.

[0018] The dimension of the limiting plate in the radial direction of the upper nozzle is larger than the dimension of the body section of the protective tube, and the upper end of the protective tube is connected to the limiting plate. Therefore, the limiting plate can be tightly abutted against the inner wall of the contraction section for limiting, so as to fix the protective tube. At the same time, during the process of sprinkling powdery material at the connection position between the upper nozzle and the tundish body, the limiting plate will prevent the powder from falling into the gap between the tube cavity and the protective tube. The through hole of the limiting plate is communicated with the tube cavity of the protective tube. During the baking process of the tundish, the hot gas and water vapor generated by the working layer can pass through the through hole and the tube cavity. Therefore, the through hole and the tube cavity provide a circulation channel for the water vapor during the baking process, ensuring the baking effect of the tundish. The protective tube is arranged at intervals in the body section, so that the protective tube will not interfere with the tube cavity, and the powdery loose material can fall from the tube cavity without contacting the tube cavity of the protective tube. The lower end of the protective tube extends out of the body section, which can protect the entire tube cavity of the protective tube along its own axis.

[0019] In specific implementation, after the upper nozzle is installed on the tundish body, the protection device is vertically inserted downward into the upper nozzle with the protection tube below and the limiting plate above, so that the limiting plate abuts against the inner wall of the contraction section. The middle part of the protection tube is located inside the body section of the upper nozzle, and the lower end extends out of the body section. After baking is completed, the protection device is moved upward relative to the upper nozzle and taken out, and then the lower upper nozzle is connected to the upper nozzle.

[0020] Since the protection device has been placed in the upper nozzle in advance during the process of sprinkling the powdery material, preventing the powdery material from falling on the inner wall of the upper nozzle, during the baking process, the powder will not adhere to the inner wall of the upper nozzle, ensuring the air permeability of the upper nozzle; at the same time, taking out the protection device after baking is completed can avoid the problem of easy damage due to moisture caused by the direct contact between the water vapor generated by the working layer and the upper nozzle during the baking process, so the service life of the upper nozzle is improved. Brief Description of the Drawings

[0021] Figure 1 Shows Figure 1 A schematic structural diagram of the tundish in one or more embodiments of the present application.

[0022] Figure 2 Shows Figure 1 A schematic structural diagram of the protection device.

[0023] Figure 3 A schematic structural diagram of the cooperation between the tundish and the protection device in one or more embodiments of the present application.

[0024] Description of the Reference Numerals:

[0025] 10 - tundish, 11 - tundish body, 111 - shell, 112 - permanent layer, 113 - working layer; 12 - upper nozzle, 121 - contraction section, 122 - body section, 13 - stopper rod, 14 - transition zone.

[0026] 20 - protection device, 21 - limiting plate, 22 - protection tube, 23 - elastic sleeve, 24 - mounting ring. Detailed Description of the Embodiments

[0027] In order to enable those skilled in the art in the technical field to which the present application belongs to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0028] Please refer to Figure 1, the tundish includes a tundish body 11 and a submerged entry nozzle 12. The tundish body 11 includes a shell 111, a permanent layer 112, and a working layer 113 arranged in sequence from outside to inside. The submerged entry nozzle 12 includes an upper submerged entry nozzle 12 and a lower submerged entry nozzle 12 arranged in sequence from top to bottom. The submerged entry nozzle 12 is installed at the bottom of the tundish body 11. During the construction process of the tundish 10, the submerged entry nozzle 12 is first installed on the shell 111, and then the permanent layer 112 and the working layer 113 are successively cast inside the shell 111. Powdery materials are scattered at the positions between the submerged entry nozzle 12, the permanent layer 112, and the working layer 113 and tamped with tools. Finally, it is baked. After baking, the lower submerged entry nozzle 12 is connected to the upper submerged entry nozzle 12 to form a complete tundish 10.

[0029] The submerged entry nozzle 12 includes a contraction section 121 and a body section 122 arranged in sequence along the height direction. The cross-sectional area of the contraction section 121 decreases successively from top to bottom. Therefore, it is often referred to as the bowl part. Cooperating with the stopper rod 13 above, it can control the flow rate of the molten steel. The body section 122 is located below the contraction section 121 and can be connected to the submerged nozzle to introduce the molten steel into the mold below.

[0030] In the first aspect embodiment of the present application, a protection device for the submerged entry nozzle 12 of the tundish 10 is provided, which is used to protect the submerged entry nozzle 12 of the tundish 10 to prevent the powdery materials used in the construction of the tundish 10 from falling onto the inner wall of the submerged entry nozzle 12, improve the air permeability of the submerged entry nozzle 12 of the tundish 10, and at the same time prevent the water vapor from directly acting on the inner wall of the submerged entry nozzle 12 during the baking process of the tundish 10, thereby improving the service life of the submerged entry nozzle 12.

[0031] Please refer to Figure 2 , the protection device includes a limiting plate 21 and a protection tube 22. The limiting plate 21 is arranged on the contraction section 121 of the submerged entry nozzle 12. That is to say, the limiting plate 21 is located in the bowl part of the submerged entry nozzle 12. The projected area of the limiting plate 21 in the vertical direction is larger than the cross-sectional area of the body section 122. This can keep the limiting part in the bowl part to fix the protection tube 22 below, and at the same time can cover the bowl part to prevent the powder from falling into the body section 122. The limiting plate 21 is provided with through holes, and the through holes are communicated with the lumen of the protection tube 22. The upper end of the protection tube 22 is connected to the limiting plate 21, so that the powder can fall outside the tundish 10 along the through holes and the lumen. At the same time, during the baking process, the water vapor generated by the evaporation of the working layer 113 can be discharged along the through holes and the lumen, so that the water vapor does not directly contact the submerged entry nozzle 12. The submerged entry nozzle 12 is easily damaged by moisture. Therefore, the through holes and the lumen serve as the discharge channels for the water vapor, improving the service life of the submerged entry nozzle 12; the protection tubes 22 are arranged at intervals in the body section 122, which is convenient for taking the protection tubes 22 and can also protect the inner wall of the body section 122, preventing the water vapor and powder from acting on the inner wall of the submerged entry nozzle 12. The lower end of the protection tube 22 extends outside the body section 122, realizing the all-round protection of the submerged entry nozzle 12 from top to bottom.

[0032] In specific implementation, after the upper nozzle 12 is installed on the body 11 of the tundish 10, please refer to Figure 3 , insert the protection device 20 vertically downward into the upper nozzle 12 with the protection tube 22 at the bottom and the limit plate 21 at the top, so that the limit plate 21 abuts against the inner wall of the contraction section 121, the middle part of the protection tube 22 is located in the body section 122 of the upper nozzle 12, and the lower end extends out of the body section 122. After the baking is completed, move the protection device 20 upward relative to the upper nozzle 12 to take it out, and then connect the lower upper nozzle 12 to the upper nozzle 12.

[0033] Since the protection device 20 has been placed in the upper nozzle 12 in advance during the process of sprinkling the powdery material, preventing the powdery material from falling on the inner wall of the upper nozzle 12, the powder will not adhere to the inner wall of the upper nozzle 12 during the baking process, ensuring the air permeability of the upper nozzle 12; at the same time, taking out the protection device 20 after the baking is completed can avoid the problem of easy damage due to moisture caused by the direct contact between the water vapor generated by the working layer 113 and the upper nozzle 12 during the baking process, so the service life of the upper nozzle 12 is improved.

[0034] In some embodiments, the limit plate 21 is a steel plate, the protection tube 22 is a steel pipe, and the steel plate and the steel pipe are welded together, which can use local materials, is convenient to assemble and is high-temperature resistant. In the specific implementation process, the outer diameter of the limit plate 21 can gradually decrease in the direction from top to bottom to match its fitting effect with the inner wall of the bowl part of the upper nozzle 12, further preventing the powder from scattering on the inner wall of the upper nozzle 12.

[0035] In some embodiments, the outer diameter of the limit plate 21 is the same as the maximum diameter of the contraction section 121 (bowl part) of the upper nozzle 12, avoiding damage to the weak part of the bowl part during the ramming of the powdery material near the upper nozzle 12, that is, in the transition zone 14. In specific implementation, the diameter of the limit plate 21 can be 160 mm and the thickness can be 5 mm.

[0036] In some embodiments, the protection device 20 further includes an elastic ring for contacting the cavity wall of the contraction section 121. The elastic ring is connected to the limit plate 21 and sleeved outside the protection tube 22 to reduce the risk of the protection device 20 knocking against the bowl part of the upper nozzle 12. In specific implementation, the outer diameter of the elastic ring can be the same as the outer diameter size of the limit plate 21, or the outer diameter of the elastic ring is slightly smaller than the outer diameter of the limit plate 21. Its material can be selected as high-temperature resistant rubber. The elastic ring can be connected to the limit plate 21 by bonding or by bolt connection. In the case where the elastic ring is connected to the limit plate 21 by bolt connection, a counter bore for accommodating the bolt head is provided on the elastic ring to avoid the bolt directly acting on the cavity wall of the contraction section.

[0037] Please refer to Figure 2, the outer diameter of the upper end of the protection tube 22 decreases successively in the direction from top to bottom to cooperate with the contraction section 121 of the upper water inlet 12, so as to improve the fitting effect between the protection tube 22 and the bowl part, and further prevent powder from scattering on the inner wall of the upper water inlet 12. In some other embodiments, the outer diameter of the upper end of the protection tube 22 remains unchanged in the direction from top to bottom, that is, the outer diameters of the limiting plate 21 and the protection tube 22 change in a stepped manner, and the protection of the upper water inlet 12 can also be achieved. Please refer to Figure 2 , when the outer diameter of the upper end of the protection tube 22 decreases successively from top to bottom and the maximum outer diameter of the protection tube 22 is the same as the outer diameter of the limiting plate 21, the elastic ring can be directly connected to the upper end of the protection tube 22. When the outer diameters of the limiting plate 21 and the protection tube 22 change in a stepped manner, the elastic ring is connected to the limiting plate 21 and sleeved outside the protection tube 22.

[0038] In some embodiments, the inner diameter of the upper end of the protection tube 22 can be the same as the inner diameter of the through hole. In other embodiments, the inner diameter of the upper end of the protection tube 22 can also be smaller than the inner diameter of the through hole. This application does not make any restrictions.

[0039] In some embodiments, the length of the protection tube 22 can be 450 - 550 mm, such as 460 mm, 470 mm, 480 mm, 490 mm, 500 mm, 510 mm, 520 mm, 530 mm or 540 mm, etc. In some other embodiments, the length of the protection tube 22 can also be 600 mm or 400 mm, etc. Based on the actual length of the upper water inlet 12, the length of the protection tube 22 being greater than the upper water inlet 12 is sufficient. The diameter of the protection tube 22 can be 40 mm,

[0040] Please refer to Figure 2 , the protection device 20 can further include an elastic sleeve 23. The elastic sleeve 23 is coated on the protection tube 22 to protect the inner wall of the upper water inlet 12 and avoid knocking on the inner wall of the upper water inlet 12. The elastic sleeve 23 can be made of a high-temperature resistant silica gel sleeve to adapt to the high-temperature baking conditions. In specific implementation, the upper end and / or the lower end of the protection tube 22 can be provided with the elastic sleeve 23 to avoid knocking on the inner wall of the upper water inlet 12 when the protection tube 22 is sent into the upper water inlet 12 from top to bottom or leaves the upper water inlet 12 from bottom to top. The size of the elastic sleeve 23 can be determined according to the diameter of the protection tube 22. For example, the length of the elastic sleeve 23 can be 150 mm and the diameter can be 45 mm.

[0041] Please continue to refer to Figure 2 , the protection device 20 further includes a mounting ring 24 and a pull ring. The mounting ring 24 is connected to the limiting plate 21, and the pull ring is mounted on the mounting ring 24, which is convenient for the operator to pull out or put into the upper water inlet 12 the limiting plate 21 and the protection tube 22 through the pull ring. In specific implementation, two pull rings can be provided. The operator holds one pull ring in each hand, and the stability is higher when pulling out or sending in the protection tube 22.

[0042] The specific application process of the protective device 20 of the present application is described in detail below:

[0043] See also Figure 3 After the water inlet 12 and the shell 111 of the tundish 10 are installed, the protective device 20 can be inserted into the water inlet 12, with the protective tube 22 at the bottom and extending out of the water inlet 12, and the limit plate 21 at the bowl of the water inlet 12. At this time, the permanent layer 112 and the working layer 113 are built, and the material is sprinkled near the position of the water inlet 12, and rammed with a ramming tool, and then the whole is baked. During the baking process, the water vapor in the working layer 113 will be discharged through the tube cavity of the protective tube 22. After the baking is completed, the protective device 20 is taken out by the pull ring. At this point, the construction of the tundish 10 is completed, and the device is reused for the next use.

[0044] The protective device 20 provided by the present application can prevent powder from being scattered to the inner wall of the water inlet during the process of spreading materials near the water inlet 12, thereby avoiding the problem of powder adhering to the inner wall of the water inlet 12 and affecting the air permeability during the high-temperature baking process. When ramming the bulk material in the transition zone 14, the weak part of the bowl of the water inlet 12 can be protected. During the high-temperature baking process, water vapor can be discharged from the protective tube 22 and will not directly act on the inner wall of the water inlet 12, thus solving the problem of the water inlet 12 being damaged after absorbing moisture. Therefore, the protective device 20 of the present application can achieve safe operation during the knotting process of the tundish 10, meet the protection requirements of the water inlet 12, and has a simple method of use, good protection effect, and high work efficiency.

[0045] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0047] In the present application, unless otherwise clearly defined and limited, the terms "connected", "fixed", etc. shall be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] In addition, in the present application, the descriptions such as "first", "second", etc. are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "plural" is two or more, unless otherwise clearly and specifically defined.

[0049] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A protective device for a tundish upper nozzle, the upper nozzle comprising a main body section and a contraction section connected to the tundish body, characterized in that: The protective device comprises: a limit plate, arranged at the contraction section of the upper water inlet, wherein the projection area of the limit plate in the vertical direction is larger than the cross-sectional area of the main body section, and the limit plate is provided with a through hole; A protective tube, wherein the upper end of the protective tube is connected to the limiting plate, the tube cavity of the protective tube is communicated with the through hole, and the protective tube is arranged in intervals in the main body section, and the lower end of the protective tube extends out of the main body section.

2. The protective device for the tundish upper water inlet according to claim 1, characterized in that: The outer diameter of the upper end of the protection tube decreases in sequence from top to bottom.

3. The protective device for the tundish upper water inlet according to claim 1, characterized in that: The outer diameter of the limiting plate is the same as the maximum diameter of the contraction section; the limiting plate is a steel plate, the protection tube is a steel tube, and the steel plate is welded to the steel tube.

4. The protective device for the tundish upper water inlet according to claim 1, characterized in that: The inner diameter of the upper end of the protection tube is the same as the inner diameter of the through hole.

5. The protective device for the tundish upper nozzle according to any one of claims 1 to 4, characterized in that: The length of the protection tube is 450-550 mm.

6. The protective device for the tundish upper nozzle according to any one of claims 1 to 4, characterized in that: It also includes an elastic sleeve, which is covered on the protection tube.

7. The protective device for the tundish upper water inlet according to claim 6, characterized in that: The elastic sleeve is a high-temperature resistant silicone sleeve.

8. The protective device for the tundish upper water inlet according to claim 6, characterized in that: There are two elastic sleeves, which are respectively sleeved on the upper end and the lower end of the protection tube.

9. The protective device for the tundish upper nozzle according to any one of claims 1 to 4, characterized in that: It also includes an elastic ring for contacting the cavity wall of the contraction section, the elastic ring is connected to the limiting plate and is sleeved outside the protection tube.

10. The protective device for the tundish upper nozzle according to any one of claims 1 to 4, characterized in that: It also includes a mounting ring and a pull ring, wherein the mounting ring is connected to the limiting plate, and the pull ring is mounted on the mounting ring.

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