Connecting device for continuous casting heat exchange
By designing a continuous casting heat exchange connection device including upper and lower frames, pillars and partitions, the problem of insufficient connection of the steel mill during tundish heat exchange in the steel mill is solved, and the stable connection of the steel mill after condensed in the crystallizer is achieved, and the smoothness of steel output is improved.
Patent Information
- Application Number
- CN202422130283.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-01
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-09-01
AI Technical Summary
In continuous casting operations in steelmaking plants, the prior art tends to cause unfiltered connections after condensation in the crystallizer during tundish heat exchange, resulting in disconnection and poor steel output.
A continuous casting heat exchange connection device is designed, including upper and lower frames, pillars, middle partition plates and vertical and horizontal legs to form a frame structure to ensure that the steel can be connected stably after condensed in the crystallizer.
The reliability and stability of the connection between the steel after condensed in the crystallizer is achieved, disconnection is avoided, and the smoothness of steel output is improved.
Smart Images
Figure CN222931795U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the continuous casting operation in a steelmaking plant, and particularly relates to a connecting device for continuous casting heat exchange. Background Art
[0002] In the tundish steel pouring operation area of the continuous casting operation area in a steelmaking plant, the continuous casting production process is as follows.
[0003] 1. The whole package of qualified molten steel is poured into the tundish, and then is diverted from the tundish into the mold.
[0004] 2. After secondary cooling and solidification, the required fixed-length is cut.
[0005] 3. It is hot-delivered to the next process for rolling.
[0006] Among them, the tundish used in continuous casting production is very important. As a container for pouring molten steel from the ladle into the mold, it is made of special refractory materials and filled with high-temperature molten steel. However, the refractory material of the tundish has a service life and needs to be replaced with a new tundish for continuous casting, which is commonly called "hot replacement" or "quick replacement" in production. At present, in production, hot replacement is mainly achieved by manually stuffing waste reinforcing bar materials into the mold. In this way, the connection between the front and rear molten steel in the mold is often not full after solidification, and it is easy to appear disconnection phenomenon, resulting in poor steel discharge. Summary of the Invention
[0007] The utility model aims at the defects existing in the prior art and provides a connecting device for continuous casting heat exchange.
[0008] To achieve the above purpose, the utility model adopts the following technical scheme, including an upper frame, a lower frame, and columns located between the upper and lower frames; the upper and lower frames are supported by columns to form a frame structure; a middle partition is arranged inside the lower frame, and a middle hole is opened in the middle of the middle partition for placing cold reinforcing bar materials; vertical legs for support are arranged at the bottom of the lower frame; horizontal legs extending horizontally outward are arranged on each of the two opposite sides of the lower frame.
[0009] Further, when the frame structure is placed in the mold, the horizontal legs are in contact with the inner wall of the mold. It is used to prevent the shaking of the frame structure.
[0010] Further, the horizontal legs are perpendicular to the vertical legs.
[0011] Further, the columns include two types: side columns located at the four corners of the frame and middle columns located between the two side columns; the tops of the side columns and the middle columns are fixedly connected to the bottom of the upper frame, and the bottoms of the side columns and the middle columns are fixedly connected to the top of the lower frame.
[0012] Further, both the upper frame and the lower frame are quadrilateral and are both horizontally arranged.
[0013] Furthermore, the longitudinal section of the frame structure is a rectangle with a wider top and a narrower bottom. (That is, any diagonal of the upper frame is longer than the diagonal of the lower frame, which is convenient for feeding.)
[0014] Furthermore, there are four vertical legs, and one vertical leg is provided at each of the four corners of the lower frame. During use, the vertical legs are inserted into the molten steel at the lower part of the mold.
[0015] Further, the bottom of the middle partition is embedded in the lower frame, the outer contour of the middle partition fits the inner wall contour of the lower frame, and the middle partition is fixedly connected to the inner wall of the lower frame.
[0016] The beneficial effects of the present utility model compared with the prior art.
[0017] Aiming at the shortcomings of the prior art, in the present utility model, during the hot replacement of the continuous casting tundish, waste reinforcing bar materials are directly stuffed into the mold to achieve hot replacement. However, often, the molten steel before and after coagulates in the mold and the connection is not solid enough, and it is easy to have a disconnection phenomenon, resulting in poor steel discharge. A reliable and stable hot replacement connection device is designed, which can achieve reliable and stable connection after the molten steel coagulates in the mold. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following further describes the present utility model in conjunction with the drawings and specific embodiments. The protection scope of the present utility model is not limited to the description of the following content.
[0019] Figure 1 is the front view of a connection device for continuous casting hot replacement;
[0020] Figure 2 is the three-dimensional view of the connecting piece of a connection device for continuous casting hot replacement;
[0021] Figure 3 is the front view of the connecting piece of a connection device for continuous casting hot replacement;
[0022] Figure 4 is the top view of a connection device for continuous casting hot replacement.
[0023] In the figure, 1, tundish; 2, molten steel; 3, nozzle; 4, mold; 5, connection device; 6, billet; 7, molten steel in the tundish after hot replacement; 8, molten steel in the tundish before hot replacement; 501, upper frame; 502, side column; 503, middle column; 504, lower frame; 505, cross leg; 506, vertical leg; 507, middle partition; 508, middle hole; 509, connection point; 510, cold reinforcing bar material. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] To better understand the technical solution of the present utility model, the following specific implementation solutions are provided; and the following solutions are only for illustration.
[0025] As Figures 1-4As shown in the figure, the connecting device 5 for continuous casting heat exchange includes an upper frame 501, a lower frame 504, and support columns. In the lower frame 504, at least four vertical support legs 506 are provided at the bottom of the lower frame 504 for support; on each of the two opposite sides of the lower frame 504, a horizontal support leg 505 extending outward is provided. The support columns are located between the upper frame 501 and the lower frame 504; a frame structure is formed by supporting between the upper frame 501 and the lower frame 504 through the support columns; the support columns include side columns 502 located at the four corners of the frame and middle columns 503 located between the two side columns 502; the tops of the side columns 502 and the middle columns 503 are fixedly connected to the bottom of the upper frame 501, and the bottoms are fixedly connected to the top of the lower frame 504. An intermediate partition 507 is provided inside the lower frame 504, and a middle hole 508 is opened in the middle of the intermediate partition 507 for placing cold steel bars 510; the bottom of the intermediate partition 507 is embedded in the lower frame 504, the outer contour of the intermediate partition 507 is adapted to the inner wall contour of the lower frame 504, and the intermediate partition 507 is fixedly connected to the inner wall of the lower frame 504.
[0026] The connecting device 5 for continuous casting heat exchange is a device that can quickly connect the molten steel 2 in the mold 4 when the tundish 1 is replaced and the molten steel is cut off. When in use, the frame structure is placed inside the mold 4. Under the action of its own weight, the vertical support legs 506 of the frame structure are inserted into the molten steel of the mold 4; the horizontal support legs 505 play a role in supporting the side wall of the mold 4 to prevent the frame from tipping over or tilting.
[0027] Preferably, the horizontal support leg 505 is in contact with the inner wall of the mold 4 to prevent the frame structure from shaking, and the horizontal support leg 505 is perpendicular to the vertical support leg 506. The number of the vertical support legs 506 is four, which are respectively arranged at the four corners of the lower frame 504.
[0028] Preferably, both the upper frame 501 and the lower frame 504 are quadrilateral and are both horizontally arranged. The longitudinal section of the frame structure is a rectangle with a wider top and a narrower bottom, which is convenient for feeding materials.
[0029] During the use of the present utility model, before heat exchange, the connecting device 5 for continuous casting heat exchange is installed in the mold 4, and half of the connecting device 5 is inserted into the liquid core of the billet shell. Then a large amount of cold materials are added to make it solidify quickly, and half is exposed on the upper part. After the preheated tundish 1 is centered at the casting position, the tundish 1 is filled with molten steel 2, and then poured into the mold 4. After the molten steel 2 and the connecting device 5 solidify slowly, they are pulled out of the mold 4, and the joint is cut off at the flame cutting machine and disposed of as waste, so as to achieve the purpose of rapid heat exchange, reduce the auxiliary time, and improve the production capacity.
[0030] In the prior art, after the casting of the previous tundish 1 is completed, the temperature of the molten steel 2 in the mold 4 will decrease. When the next tundish 1 comes for casting, the temperature difference of the molten steel 2 caused by the casting between the two tundishes 1 leads to an interface between the molten steel of the two ladles in the mold 4, and it is easy to break at the interface during subsequent steel drawing, resulting in the failure of steel drawing. In the present utility model, after the molten steel 2 in the previous tundish 1 is completely cast, the molten steel 2 is in the mold 4 (molten steel 2 of the tundish 1 before heat exchange). At this time, an operator manually puts a connecting piece (connecting device 5) into the mold 4, and makes the lower vertical leg 506 of the connecting piece insert into the molten steel 2 until the middle horizontal leg 505 touches the molten steel surface. The upper part of the connecting piece (the upper part of the middle partition 507) is all exposed to the air. At this time, some cold reinforcing bars 510 can be placed in the connecting piece. Then, the new tundish 1 is hoisted into place, and the molten steel flows out from the nozzle 3 into the mold 4. At this time, the new molten steel (molten steel 2 of the tundish 1 after heat exchange) fills the upper part of the connecting piece (the upper part of the middle partition 507) with molten steel 2. At this time, the newly cast molten steel 2 and the molten steel 2 of the previous tundish 1 are seamlessly connected through the connecting piece.
[0031] Embodiment 1, manufacturing process: The connecting device 5 for continuous casting heat exchange is manufactured according to the cross-sectional dimension of the produced billet type. The frame dimension of the connecting device 5 needs to be 20 mm smaller than the diameter of the billet type (the inner wall shape of the mold 4). A frame is welded with φ32 mm threaded steel, and then a 5 mm iron plate with the same size is welded in the middle of the frame. A 30 mm long steel rod is welded in the middle of the threaded steel at the four corners of the frame to be stuck on the inner wall of the mold 4 when placing the connecting piece. Through long-term use in production, it reaches stability and reliability, saves production auxiliary time, and is simple in manufacturing, operation and use.
[0032] Embodiment 2, the middle partition 507 and the bottom of the middle column 503 are welded and connected at the connection point 509 to facilitate the fixation of the middle partition.
[0033] Introduction to the usage process and working principle.
[0034] 1. When the casting of the tundish 1 is completed (all the molten steel 2 in the tundish 1 is poured out), it is necessary to replace it with another tundish 1 filled with molten steel 2 to continue casting, which is called "heat exchange".
[0035] 2. During heat exchange, the molten steel 2 in the tundish 1 used for on-line casting is poured out, and it is horizontally moved to the baking position. Another newly baked and preheated tundish 1 is horizontally moved to the casting position. Before moving to the casting position, it is necessary to install the connecting piece (i.e., the connecting device 5) of the present utility model in the mold 4.
[0036] 3. This connecting piece is manually placed into the mold 4, and the lower vertical leg 506 of the connecting piece is inserted into the liquid core of the mold 4 (this liquid core is the molten steel, which is the molten steel remaining in the mold 4 after the casting of the previous tundish 1 is completed).
[0037] 4. Then, a large amount of cold reinforcing steel 510 is added into the cavity formed by the upper frame 501 and the lower frame 504. The cold reinforcing steel 510 is vertically inserted into the middle hole 508, and half of the cold reinforcing steel 510 is exposed outside the middle partition 507.
[0038] 5. After the preheated tundish 1 is centered at the casting position, the tundish 1 is filled with molten steel 2. The molten steel 2 is cast into the mold 4 from the lower nozzle 3 of the tundish 1, and the molten steel 2 submerges the connecting device 5 as a whole and fills the entire mold 4.
[0039] 6. After the molten steel 2 in the mold 4 and the connecting device 5 solidify, they are pulled out of the mold 4, and then the joint is cut off at the flame cutting machine. After cutting, the connector is disposed of as a waste product, thereby realizing rapid hot replacement, reducing the auxiliary time and increasing the production capacity.
[0040] The connecting device 5 of the present utility model adopts a frame structure, which is convenient for placing reinforcing steel inside and for the molten steel 2 to flow in. Its bottom adopts a leg support method, which can effectively insert the legs into the molten steel 2. A partition is provided in the middle of the device, which helps to increase the strength of the entire connecting device 5. The middle hole 508 can realize the function of overflowing the excess molten steel 2 upward through the middle hole 508.
[0041] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; therefore, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present utility model.
Claims
1. A continuous casting heat exchange connection device, comprising an upper frame (501), a lower frame (504), and a support located between the upper and lower frames; characterized in that: The upper and lower frames are supported by pillars to form a frame structure; a middle partition (507) is arranged in the lower frame (504), and a middle hole (508) is provided in the middle of the middle partition (507) for placing cold steel bars (510); a vertical support leg (506) for support is arranged at the bottom of the lower frame (504); and a horizontal support leg (505) extending horizontally outward is respectively arranged on opposite sides of the lower frame (504).
2. A continuous casting heat exchange connection device according to claim 1, characterized in that: When the frame structure is placed in the crystallizer (4), the horizontal legs (505) are in contact with the inner wall of the crystallizer (4).
3. A continuous casting heat exchange connection device according to claim 1, characterized in that: The horizontal supporting leg (505) is perpendicular to the vertical supporting leg (506).
4. A continuous casting heat exchange connection device according to claim 1, characterized in that: The pillars include two types: side pillars (502) located at the four corners of the frame, and a middle pillar (503) located between two side pillars (502); the tops of the side pillars (502) and the middle pillar (503) are both fixedly connected to the bottom of the upper frame (501), and the bottoms of the side pillars (502) and the middle pillar (503) are both fixedly connected to the top of the lower frame (504).
5. A continuous casting heat exchange connection device according to claim 1, characterized in that: The upper frame (501) and the lower frame (504) are both quadrilaterals, and both are arranged horizontally.
6. A continuous casting heat exchange connection device according to claim 5, characterized in that: The longitudinal section of the frame structure is a rectangle that is wide at the top and narrow at the bottom.
7. A continuous casting heat exchange connection device according to claim 5, characterized in that: There are four vertical legs (506), and each of the four corners of the lower frame (504) is provided with a vertical leg (506).
8. A continuous casting heat exchange connection device according to claim 1, characterized in that: The bottom of the middle partition (507) is embedded in the lower frame (504), the outer contour of the middle partition (507) is adapted to the inner wall contour of the lower frame (504), and the middle partition (507) is fixedly connected to the inner wall of the lower frame (504).