Tundish and sealing method thereof

Abstract

The invention discloses a tundish and a sealing method thereof, and belongs to the technical field of die casting equipment. The technical problem that the sealing effect between a tundish body and a tundish cover of an existing tundish is not ideal, so that the secondary oxidation phenomenon exists in the pouring link, and the metallurgical quality of steel ingots is affected is solved. The tundish comprises a tundish body, a tundish cover and a core rod mechanism. A ladle body flange is arranged at the top of the ladle body, and a first protruding part is arranged on the ladle body flange; the first protruding part is positioned outside the top opening of the bag body; the core rod mechanism is arranged on the first protruding part; a second protruding part is arranged on the bag cover, the first protruding part is located below the second protruding part and corresponds to the second protruding part in position, and the bag cover and the second protruding part can cover the bag body and the first protruding part of the bag body; a ladle cover flange is arranged on the outer side face of the ladle cover and close to the bottom of the ladle cover. The ladle cover flange and the ladle body flange are arranged in an aligned mode and fixedly connected. Good sealing between the ladle body and the ladle cover is achieved, and the problem of secondary oxidation of molten steel caused by poor sealing is solved.

Description

Technical Field

[0001] The invention relates to the technical field of die casting equipment, and in particular to a tundish and a sealing method thereof. Background Art

[0002] In the field of die casting technology, the tundish is widely used in the production practice of large vacuum steel ingots. It is an important component that connects the ladle and the ingot mold placed in the vacuum casting chamber. It plays the role of a "transfer station" in the entire steelmaking and casting process. The tundish is located between the ladle used to hold molten steel and the ingot mold used to form the ingot. The tundish is an indispensable part of the die casting production line. Its performance directly affects the quality of the ingot, and then affects the quality and production efficiency of the final product. The main functions of the tundish include: purification function, temperature control function, pressure reduction and flow stabilization function, refining function and heating function.

[0003] The tundish cover is an important component of the tundish. It can keep the heat insulated when the tundish is baked offline or poured online, and protect the sliding plate mechanism of the steel plate of the ladle from the heat radiation of the molten steel, playing a role of safety protection. At the same time, it plays a role of safety protection when measuring temperature and taking samples, and can also improve the working environment of workers.

[0004] The tundish used for vacuum casting is equipped with a core rod mechanism on the outer side of the ladle body near the water inlet. The sealing effect of the tundish cover is not ideal during use. There are problems such as warping and deformation of the cover, loose sealing between the cover and the ladle body, and many holes in the cover. This leads to a certain degree of secondary oxidation in the pouring process, affecting the metallurgical quality of the steel ingot. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a dome-shaped tundish cover and sealing method to solve the technical problem that the sealing effect between the existing tundish body and the cover is not ideal, resulting in secondary oxidation in the pouring process and affecting the metallurgical quality of the steel ingot.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a tundish, comprising a tundish body, a tundish cover and a core rod mechanism; a tundish body flange is provided on the top of the tundish body, and a first protrusion is provided on the tundish body flange; the first protrusion is located outside the opening at the top of the tundish body; the core rod mechanism is provided on the first protrusion;

[0008] A second protrusion is provided on the bag cover, the first protrusion is located below the second protrusion and the positions of the two are corresponding, the bag cover and its second protrusion can cover the bag body and its first protrusion; a bag cover flange is provided on the outer surface close to the bottom of the bag cover; the bag cover flange is aligned with the bag body flange and the two are fixedly connected.

[0009] In a possible design, the cover includes a spherical top structure cover body and an annular plate; the spherical top structure cover body is arranged above the annular plate and the two are fixedly connected, and the bottom surface of the cover body flange is flush with the bottom surface of the annular plate;

[0010] An arc-shaped protrusion is provided on the spherical top structure cover body, and an arc-shaped columnar protrusion is provided on the ring plate; the positions of the arc-shaped protrusion and the arc-shaped columnar protrusion correspond to each other and the two together constitute the second protrusion.

[0011] In a possible design, the inner bottom surface of the spherical top structure cover and the inner side surface of the ring plate are both inlaid with refractory materials.

[0012] In a possible design, positioning pin holes are provided on the circumference of the cover flange;

[0013] Positioning pins are arranged on the circumference of the flange of the package body; the positions of the positioning pin holes correspond to the positions of the positioning pins and the number of the positioning pins is equal; after the package cover is covered on the package body, the positioning pins can be inserted into the corresponding positioning pin holes.

[0014] In a possible design, a through hole is provided on the first protruding portion, and the core rod mechanism is installed on the first protruding portion through the through hole.

[0015] In a possible design, an annular groove is provided on the top surface of the flange of the enclosure body, and the annular groove is located outside the through hole and between the outer diameter and the inner diameter in the thickness direction of the ring plate;

[0016] A sealing ring is arranged in the annular groove, and the sealing ring is used to achieve sealing between the bag body and the bag cover.

[0017] In a possible design, the outer diameter of the cover flange is 30-50 mm larger than the outer diameter of the ring plate.

[0018] In a possible design, a peephole and a steel hole are provided above the spherical top structure cover; and a plurality of lifting ears are evenly distributed along the circumference of the ring plate.

[0019] In a possible design, a plurality of reinforcing ribs are provided on the bottom surface of the enclosure flange along the circumference of the enclosure, one end of the reinforcing rib is fixedly connected to the bottom surface of the enclosure flange, and the other end is fixedly connected to the outer wall of the enclosure.

[0020] On the other hand, the present invention also provides a method for sealing a tundish, which is used to seal the tundish, and the sealing method comprises the following steps:

[0021] Step 1, inlaying refractory materials on the tundish spherical top structure cover and the inner side of the ring plate;

[0022] Step 2, installing the core rod mechanism on the first protruding portion;

[0023] Step 3: Cover the bag cover on the bag body and assemble the two.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] (1) The present invention integrates the dome structure cover and the annular plate structure thereunder into a cover, and inlays asbestos inside the cover. Asbestos, as a refractory material, reduces the radiation to the cover during baking, thereby exacerbating the problem of cover deformation.

[0026] (2) The spherical top structure cover of the present invention is less likely to deform than the existing flat cover in terms of structure. In addition, since the spherical top structure cover is arranged above the ring plate, the distance between the spherical top structure cover and the molten steel is larger than that of the flat cover, and therefore, the radiation of the molten steel to the cover is reduced.

[0027] (3) The present invention sets a cover flange on the outer side of the ring plate, and fixes the cover flange to the body flange by positioning pins, thereby achieving a stable fit between the body and the cover. At the same time, the present invention reduces the number of openings on the spherical top structure cover, and only retains the necessary holes for steel exchange, peep holes and temperature measurement holes, thereby solving the problem of the original intermediate cover having many holes and being easy to warp.

[0028] (4) The present invention can achieve good sealing between the cladding cover and the cladding body by arranging the annular groove on the top surface of the cladding body flange and arranging a sealing ring in the annular groove, thereby solving the problem of secondary oxidation of molten steel caused by poor sealing between the cladding body and the cladding cover.

[0029] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are only for the purpose of illustrating specific embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0031] Figure 1 It is a schematic diagram of the outer contour of the spherical dome structure cover and the ring plate of the present invention;

[0032] Figure 2 It is a schematic diagram of the partial structure of the package cover as a whole and the package body flange of the present invention;

[0033] Figure 3 It is a top view of the entire package cover and a partial structure of the package body flange of the present invention;

[0034] Figure 4 for Figure 2 The enlarged schematic diagram at the X in the middle is also a schematic diagram of the sealing of the argon blowing pipeline at the through hole;

[0035] Figure 5 It is a schematic diagram of the dimensions of the entire package cover and a partial structure of the package body flange of the present invention;

[0036] Figure 6 It is a structural schematic diagram of the package flange;

[0037] Figure 7 Schematic diagram of sealing of argon blowing pipeline at the through hole;

[0038] Figure 8 Top view of the argon gas pipeline layout.

[0039] Reference numerals:

[0040] 1-spherical dome structure cover; 2-ring plate; 3-steel hole; 4-peephole and temperature measuring hole; 5-enclosure flange; 6-reinforcement rib plate; 7-sealing ring; 8-locating pin hole; 9-asbestos; 10-locating pin; 11-through hole; 12-lifting ear; 13-core rod mechanism; 14-argon blowing sealing pipeline; 15-enclosure flange; 16-arc-shaped protrusion; 17-arc-shaped columnar protrusion; 18-enclosure; 19-first protrusion; 20-annular groove; 21-argon gas pipe; 22-core rod; 23-inlet pipe; 24-argon gas outlet. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0042] In one aspect, the present invention provides a tundish, such as Figures 1 to 6 As shown, the intermediate ladle includes a ladle body 18, a ladle cover and a core rod mechanism 13; a ladle body flange 5 is provided on the top of the ladle body 18, and a first protrusion 19 is provided on the ladle body flange 5; the first protrusion 19 is located on the outside of the top opening of the ladle body 18; the core rod mechanism 13 is provided on the first protrusion 19; a second protrusion is provided on the ladle cover, and the first protrusion 19 is located below the second protrusion and the positions of the two are corresponding, and the ladle cover and its second protrusion can cover the ladle body 18 and its first protrusion 19; a ladle cover flange 15 is provided on the outer side surface close to the bottom of the ladle cover; the ladle cover flange 15 is aligned with the ladle body flange 5 and the two are fixedly connected.

[0043] Specifically, the top of the package body 18 of the present invention is provided with a package body flange 5, which is an annular flange (for example, a circular flange), and a first protrusion 19 is provided above the package body flange 5, and the first protrusion 19 is an arc-shaped protrusion 16, which is provided on the side of the package body flange 5 and the two are located on the same horizontal plane; in addition, the opening diameter of the package body 18 is smaller than the outer diameter of the package body flange 5 and the first protrusion 19 is located on the outer side of the top opening of the package body 18; a second protrusion is provided on the package cover, and the second protrusion is located directly above the first protrusion 19 and the positions of the two correspond; near the bottom of the package cover, an annular package cover flange 15 is provided on its outer side surface, the package cover flange 15 is shaped in the same shape as the outer wall of the ring plate 2, and the outer diameter of the package cover flange 15 is equal to that of the package body flange 5; the package cover and the package body 18 are assembled by stacking the package cover flange 15 and the package body flange 5.

[0044] Compared with the prior art, the present invention provides a second protrusion on the ladle cover and a first protrusion 19 on the ladle body 18. The first protrusion 19 corresponds to the second protrusion in position and the second protrusion can cover the first protrusion 19, thereby ensuring that the core rod mechanism 13 of the tundish can be contained in the ladle cover, reducing the holes in the tundish cover, achieving the goal of not seeing light during the pouring process, and ensuring that the tundish is in a fully sealed state.

[0045] In order to avoid deformation of the ladle cover caused by radiation of the high-temperature molten steel in the ladle body 18, the ladle cover of the present invention includes a spherical top structure cover body 1 and a ring plate 2; the spherical top structure cover body 1 is arranged above the ring plate 2 and the two are fixedly connected, and the bottom surface of the cover body flange is flush with the bottom surface of the ring plate 2; the spherical top structure cover body 1 is provided with an arc-shaped protrusion 16, and the ring plate 2 is provided with an arc-shaped columnar protrusion 17; the positions of the arc-shaped protrusion 16 and the arc-shaped columnar protrusion 17 correspond to each other and the two together constitute a second protrusion.

[0046] Specifically, the ring plate 2 of the present invention is an annular plate body with a certain height, and the spherical top structure cover body 1 is arranged on the top of the ring plate 2. The two are formed as one piece, and the top surface of the ring plate 2 is shaped in the same shape as the bottom surface of the spherical top structure cover body 1 and the two are fixedly connected; the arc-shaped protrusion 16 on the spherical top structure cover body 1 covers the top surface of the arc-shaped columnar protrusion 17 on the ring plate 2, and the arc-shaped protrusion 16 and the arc-shaped columnar protrusion 17 together constitute a cavity that can accommodate the first protrusion 19, that is, the two together constitute the second protrusion; the cover body flange is arranged on the outer side surface of the ring plate 2 and close to the bottom of the ring plate 2, the bottom surface of the cover body flange is flush with the bottom surface of the ring plate 2, and the bottom surfaces of both are in contact with the top surface of the enclosure flange 5.

[0047] Compared with the prior art, the present invention can contain the first protrusion 19 in the cladding cover by providing an arc-shaped protrusion 16 and an arc-shaped columnar protrusion 17; and by providing a ring plate 2 of a certain height, a certain distance can be maintained between the spherical top structure cover 1 and the molten steel in the cladding 18, thereby preventing the cladding cover from being deformed by heat and affecting the sealing effect and service life.

[0048] It should be noted that the outer diameter of the cover flange 15 of the present invention is 30-50 mm larger than the outer diameter of the ring plate 2, for example, 30 mm, 35 mm, 40 mm and 45 mm, so that the surface of the cover flange 15 is more stable, thereby making the cover as a whole more stable.

[0049] In order to prevent the cover from being deformed, the inner bottom surface of the spherical top structure cover 1 and the inner side surface of the ring plate 2 of the present invention are both inlaid with refractory materials, such as asbestos 9.

[0050] Compared with the prior art, the present invention can reduce the baking of molten steel and avoid deformation of the cover by embedding asbestos 9 material on the inner bottom surface (ie, bottom surface) of the dome structure cover 1 and the inner side surface of the ring plate 2.

[0051] In order to realize the assembly of the package body 18 and the package cover, positioning pin holes 8 are provided along the circumference of the outer edge of the package cover flange 15; positioning pins 10 are provided on the circumference of the package body flange 5 close to its outer edge; the positioning pin holes 8 and the positioning pins 10 correspond in position and are equal in number; after the package cover is covered on the package body 18, the positioning pins 10 can be inserted into the corresponding positioning pin holes 8, thereby realizing the assembly of the package body 18 and the package cover.

[0052] In order to fix the core rod mechanism 13 , the first protruding portion 19 of the present invention is provided with a through hole 11 , and the core rod mechanism 13 is installed on the first protruding portion 19 through the through hole 11 .

[0053] Specifically, the core rod mechanism 13 comprises a core rod, a core rod cross beam, a core rod vertical rod and a vertical rod main shaft, wherein the core rod is connected to the core rod cross beam by bolts, the core rod cross beam is connected to the vertical rod main shaft in the core rod vertical rod by bolts, and the core rod vertical rod is connected to the outer side of the ladle 18 by welding. The core rod mechanism is used to stabilize the flow of molten steel in the tundish, reduce the formation of vortex, control the flow rate in the tundish, and play a role in slag jamming at the end of pouring; it should be explained that the core rod mechanism 13 is a conventional structure, and its detailed working process is not repeated.

[0054] It should be noted that if Figure 5As shown, the through hole 11 on the first protrusion 19 of the present invention is located at a radius of 1679mm of the enclosure flange 5; the diameter of the through hole 11 is 200mm; at the through hole 11 of the enclosure flange 5, an argon blowing sealing pipeline 14 is used to seal the gap between the through hole 11 and the core rod vertical rod of the core rod mechanism 13. Regarding the sealing of the core rod mechanism, an argon blowing pipeline is set at the flange passing through the protrusion of the core rod to form a sealing gas curtain to ensure the sealing effect between the accessories of the core rod mechanism. Among them, small holes are opened in the main argon gas pipe at intervals of 45°, and the argon gas pipe is welded with the existing gas pipe and placed around the through hole, which is simple to implement. Figure 7 and Figure 8 As shown, the gap between the core rod 22 and the through hole 11 is arranged, the air inlet pipe 23 interface is downward, and an argon outlet 24 is reserved on the argon pipe 21.

[0055] In order to further improve the sealing between the package cover and the package body 18, an annular groove is provided on the top surface of the package body flange 5 of the present invention, and the annular groove is located on the outside of the through hole 11 and between the outer diameter and the inner diameter of the ring plate 2 in the thickness direction of the ring plate 2; a sealing ring 7 is provided in the annular groove, and the sealing ring 7 is used to achieve sealing between the package body 18 and the package cover.

[0056] Specifically, an annular groove is provided on the top surface of the enclosure flange 5, the opening of the annular groove faces the direction of the ring plate 2, the size of the annular groove is (50-60) mm×(50-60) mm (height×width), for example, 50mm×50mm, 55mm×55mm, the annular groove is located on the top surface of the enclosure flange 5 close to its outer edge, the annular groove is located on the outside of the through hole 11 and at a position on the top surface of the enclosure flange 5 corresponding to between the outer diameter of the ring plate 2 and the inner diameter of the ring plate 2 in the thickness direction of the ring plate 2, for example, the annular groove is directly opposite to the middle position in the thickness direction of the ring plate 2; a sealing ring 7, for example, a rubber ring, is installed in the annular groove, and the top of the rubber ring contacts the bottom surface of the ring plate 2.

[0057] The present invention can ensure good sealing between the ladle 18 and the ladle cover by arranging an annular groove on the top of the ladle flange 5 and arranging a sealing ring 7 in the annular groove, thereby solving the problem of secondary oxidation of molten steel in the tundish caused by poor sealing.

[0058] It should be noted that, the top of the spherical dome structure cover 1 of the present invention is provided with a steel hole 3 , a peep hole and a temperature measuring hole 4 ; and a plurality of lifting ears 12 are evenly distributed along the circumference of the ring plate 2 .

[0059] Specifically, along the circumferential direction of the ring plate 2, the lifting ears 12 are arranged at intervals of 10°, and the lifting ears 12 are provided to facilitate the later lifting of the cover.

[0060] In order to strengthen the firmness between the enclosure 18 and the enclosure flange 5, and further improve the stability of the enclosure flange 5, the present invention provides a plurality of reinforcing ribs 6 on the bottom surface of the enclosure flange 5 along the circumference of the enclosure 18, one end of the reinforcing rib 6 is fixedly connected to the bottom surface of the enclosure flange 5, and the other end is fixedly connected to the outer wall of the enclosure 18.

[0061] Specifically, a reinforcing rib plate 6 is arranged at intervals of 90° along the circumferential direction of the enclosure 18, one end of the reinforcing rib plate 6 is welded to the bottom surface of the enclosure flange 5 (including the bottom surface of the first protrusion 19), and the other end is welded to the outer wall of the enclosure 18, a total of five reinforcing rib plates 6, the reinforcing rib plates 6 are steel plates with a length of 170 mm, a width of 115 mm and a thickness of 80 mm, the reinforcing rib plates 6, the outer wall of the enclosure 18 and the enclosure flange 5 form a triangular structure, and its main function is to support the enclosure flange 5, thereby making the enclosure flange 5 more stable.

[0062] It should be noted that the distance between the top surface of the package body flange 5 and the upper edge of the package body 18 is 260 mm; a trunnion for hoisting the tundish is provided on the outer wall of the package body 18, and the lower end surface of the package body flange 5 is located above the axis of the trunnion.

[0063] A peep hole and a steel exchange hole 3 are provided above the spherical top structure cover body 1 in the above-mentioned tundish cover body, and a lifting lug 12 is arranged at a circumferential position of the ring plate 2.

[0064] Compared with the prior art, (1) the present invention forms a cover with the dome structure cover 1 and the ring plate 2 structure therebelow as a whole, and embeds asbestos 9 on the inner side of the cover. Asbestos 9, as a refractory material, can reduce the radiation to the cover during baking, thereby avoiding deformation of the cover.

[0065] (2) The spherical dome structure cover 1 of the present invention is less likely to deform than the existing flat cover in terms of structure. In addition, since the spherical dome structure cover 1 is arranged above the ring plate 2, there is a certain distance between the spherical dome structure cover 1 and the molten steel, and therefore, the radiation of the molten steel to the cover is reduced.

[0066] (3) The present invention sets a cover flange 15 on the outer side of the ring plate 2, and fixes the cover flange 15 to the body flange 5 by means of positioning pins 10, thereby achieving a stable fit between the body 18 and the cover. At the same time, the present invention reduces the number of openings on the dome structure cover 1, and only retains the necessary holes for the steel filling hole 3, the peep hole and the temperature measuring hole 4, thereby solving the problem of the original intermediate cover having many holes and being easy to warp.

[0067] (4) The present invention can achieve good sealing between the cladding cover and the cladding body 18 by arranging the annular groove on the top surface of the cladding body flange 5 and arranging the sealing ring 7 in the annular groove, thereby solving the problem of secondary oxidation of molten steel caused by poor sealing between the cladding body 18 and the cladding cover.

[0068] The present invention also provides a tundish sealing method, which is used to seal the tundish, and the sealing method comprises the following steps:

[0069] Step 1, inlaying refractory materials on the inner sides of the tundish spherical top structure cover 1 and the ring plate 2;

[0070] In the above step 1, asbestos 9 material is embedded on the bottom surface of the dome structure cover 1 and the inner side surface of the ring plate 2 to reduce the radiation of the cladding during the baking of the molten steel and avoid deformation of the cladding.

[0071] Step 2: Install the core rod mechanism 13 on the first protruding portion 19;

[0072] In the above step 2, a through hole 11 is provided on the first protruding portion 19; and an argon blowing sealing pipeline 14 is used to block the gap between the core rod mechanism 13 and the mounting hole to achieve argon blowing sealing.

[0073] It should be noted that the package body flange and the package cover flange of the present invention are generally circular except for their respective protrusions. Figure 5 As shown, the inner diameter of the cover flange is 2587mm, which is greater than or equal to the outer diameter of the tundish body opening, so that the cover flange can be better installed on the tundish body flange; the radius of the main circle of the cover flange is 1628.5mm, which is consistent with the radius of the main circle of the dome cover; the outer radius of the groove opened in the main circle of the tundish body flange is 1541mm, and its inner radius is 1491mm; the through hole is located at the radius of 1679mm of the tundish body flange, and the diameter of the through hole is 200mm, which is greater than the outer diameter of the core rod mechanism, so that the core rod mechanism can pass through. The angle between the center of the through hole and the center line of the flange is 30°, which is consistent with the angle between the center of the tundish water outlet and the center line of the tundish body, and the central axis of the through hole is parallel to the central axis of the tundish water outlet.

[0074] Step 3, cover the bag cover on the bag body 18;

[0075] In the above step 3, the sealing ring 7 is installed in the annular groove 20, and the first protrusion 19 is aligned with the second protrusion. Since the outer diameters of the package body flange 5 and the package cover flange 15 are equal, the two are aligned first, and then the locating pin hole 8 on the package cover flange 15 is aligned with the locating pin 10 on the package body flange 5. Finally, the locating pin 10 is inserted into the corresponding locating pin hole 8 to realize the assembly of the package cover and the package body 18 while achieving good sealing of the two.

[0076] In the above step 3, the size of the annular groove is 50 mm×50 mm.

[0077] In the above step 1, the present invention embeds asbestos 9 inside the dome structure cover 1 and the ring plate 2 thereunder. As a refractory material, the asbestos 9 can reduce the radiation to the cover during baking and avoid deformation of the cover. In addition, the ring plate 2 of the present invention has a certain height. The set ring plate 2 makes the dome structure cover 1 have a certain distance from the molten steel, thereby reducing the radiation of the molten steel to the cover.

[0078] In step 3 of the present invention, the present invention can achieve good sealing between the cladding cover and the cladding body 18 by setting the annular groove on the top surface of the cladding body flange 5 and setting the sealing ring 7 in the annular groove, thereby solving the problem of secondary oxidation of molten steel caused by poor sealing between the cladding body 18 and the cladding cover.

[0079] 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 changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A tundish, characterized in that: It comprises a bag body, a bag cover and a core rod mechanism; the top of the bag body is provided with a bag body flange, and the bag body flange is provided with a first protrusion; the first protrusion is located outside the opening of the top of the bag body; the core rod mechanism is provided on the first protrusion; The package cover is provided with a second protrusion, the first protrusion is located below the second protrusion and the positions of the two are corresponding, the package cover and its second protrusion can cover the package body and its first protrusion; a package cover flange is provided on the outer surface of the package cover near its bottom; the package cover flange is aligned with the package body flange and the two are fixedly connected.

2. The tundish according to claim 1, characterized in that: The cover comprises a spherical top structure cover body and a ring plate; the spherical top structure cover body is arranged above the ring plate and the two are fixedly connected, and the bottom surface of the cover body flange is flush with the bottom surface of the ring plate; The spherical dome structure cover is provided with an arc-shaped protrusion, and the annular plate is provided with an arc-shaped columnar protrusion; the positions of the arc-shaped protrusion and the arc-shaped columnar protrusion correspond to each other and the two together constitute the second protrusion.

3. The tundish according to claim 2, characterized in that: The inner bottom surface of the spherical top structure cover and the inner side surface of the ring plate are both inlaid with refractory materials.

4. The tundish according to claim 1, characterized in that: The cover flange is provided with positioning pin holes on its circumference; The flange of the package body is provided with positioning pins in the circumferential direction; the positioning pin holes correspond to the positions of the positioning pins and are equal in number; after the package cover is covered on the package body, the positioning pins can be inserted into the corresponding positioning pin holes.

5. The tundish according to claim 1, characterized in that: The first protruding portion is provided with a through hole, and the core rod mechanism is installed on the first protruding portion through the through hole.

6. The tundish according to claim 5, characterized in that: An annular groove is provided on the top surface of the flange of the enclosure, and the annular groove is located outside the through hole and between the inner diameter and the outer diameter of the ring plate in the thickness direction; A sealing ring is arranged in the annular groove, and the sealing ring is used to achieve sealing between the package body and the package cover.

7. The tundish according to claim 2, characterized in that: The outer diameter of the cover flange is 30-50 mm larger than the outer diameter of the ring plate.

8. The tundish according to claim 2, characterized in that: A peephole and a steel exchange hole are arranged above the spherical top structure cover; and a plurality of lifting ears are evenly distributed along the circumference of the ring plate.

9. The tundish according to claim 1, characterized in that: On the bottom surface of the enclosure flange, a plurality of reinforcing ribs are provided along the circumference of the enclosure, one end of the reinforcing rib is fixedly connected to the bottom surface of the enclosure flange, and the other end is fixedly connected to the outer wall of the enclosure.

10. A method for sealing a tundish, characterized in that: Used to achieve the sealing of the cover and the body of the tundish according to any one of claims 2 to 9; the sealing method comprises the following steps: Step 1, inlaying refractory materials on the tundish spherical top structure cover and the inner side of the ring plate; Step 2, installing the core rod mechanism on the first protruding portion; Step 3: Cover the bag cover on the bag body and assemble the two.

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