Combined type molten pool flow distribution device for thin strip cast rolling

Abstract

The utility model belongs to the field of double-roller thin-strip continuous casting and rolling, and relates to a combined type molten pool flow distribution device for thin-strip continuous casting and rolling, which comprises a trapezoidal flow distributor cavity and a conical fluid director, the conical fluid director is of a rectangular pyramid equal-wall-thickness structure, the peripheral edge of the lower portion of the conical fluid director is provided with flow guide holes, and the conical fluid director is located inside the flow distributor cavity. The flow distributor cavity is divided into an upper cavity and a lower cavity, the upper cavity is of a cubic structure, the lower cavity is of a frustum structure, the four faces of the upper cavity are gradually shrunk towards the middle at a certain angle, turbulence restraining baffles are arranged at the bottom of the lower cavity, flow distribution holes are formed in the bottom of the lower cavity, and casting liquid flows out of the submersed nozzle and is dispersed to the periphery of the upper cavity of the flow distributor through the conical fluid director. The water flows down along the inner wall of the lower cavity of the flow distributor through the flow guide holes, is converged at the bottom of the lower cavity and finally flows into a molten pool through bottom flow distribution holes; in the process, the casting liquid flows along the inclined plane, the casting liquid can be stably and uniformly distributed in the molten pool, the temperature distribution is uniform, the problems that the casting liquid flows disorderly, the liquid level fluctuates violently and the like are solved, and the strip casting and rolling quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of twin-roll thin strip continuous casting and rolling, and relates to a composite molten pool distribution device for thin strip casting and rolling. Background Technology

[0002] Twin-roll continuous casting and rolling technology is an advanced strip production method. It involves directly injecting molten metal raw materials into a molten pool consisting of two casting rolls rotating in opposite directions and end plates on both sides. Through rapid solidification and plastic deformation, thin strip products are directly produced. Due to its high efficiency and energy-saving characteristics, this technology has broad application prospects in the strip production field.

[0003] However, the production process of twin-roll continuous strip casting and rolling is extremely complex, involving multiple physical processes such as heat transfer, solidification, and plastic deformation, all of which are completed in a very short time. Therefore, many factors affect the quality of strip production, among which the uniformity and stability of the liquid metal in the molten pool are key factors.

[0004] Traditional flow distributor designs have significant shortcomings in molten pool distribution systems. Due to the lack of effective measures to suppress turbulence and stream impact, molten metal often flows directly and vertically into the flow distributor, leading to an unstable flow field within the molten pool and resulting in significant fluctuations. This unstable flow field not only affects the uniformity of temperature distribution but can also trigger various defects during the casting and rolling process, such as uneven strip surface and inhomogeneous internal structure, thus severely reducing the quality of thin strip casting and rolling.

[0005] Therefore, developing a new type of flow distribution device that can improve the stability and uniformity of molten casting flow and reduce turbulence and surface fluctuations caused by vertical impact of molten casting is of great significance for improving the production efficiency and product quality of twin-roll thin strip continuous casting and rolling technology. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a composite molten pool distribution device for thin strip casting and rolling, which reduces the turbulence and surface fluctuations caused by the vertical impact of the molten casting, stabilizes the flow field, ensures uniform temperature distribution, and improves the production quality of cast and rolled thin strip.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a composite molten pool distribution device for thin strip casting and rolling, comprising a trapezoidal distributor cavity, a conical guide, and an immersion nozzle. The trapezoidal distributor cavity is divided by the conical guide into an upper distributor chamber and a lower distributor chamber. The two chambers are connected at the boundary by a stepped structure, which supports the conical guide. Several guide holes are provided around the lower perimeter of the conical guide to disperse the molten casting to the perimeter of the upper distributor chamber. A distribution hole is provided at the bottom of the lower distributor chamber, through which the molten casting flows into the molten pool. During the entire distribution process, after the molten casting flows in from the immersion nozzle, it is first diverted by the conical guide to the perimeter of the upper distributor chamber, then enters the lower distributor chamber through the guide hole, flows obliquely down the four walls to the bottom, and finally flows smoothly into the molten pool through the distribution hole, achieving a stable and uniform distribution of the molten casting.

[0008] Optionally, the conical guide is a square pyramid with equal wall thickness, narrow at the top and wide at the bottom, and is installed in the upper chamber of the distributor and directly below the immersion nozzle.

[0009] Optionally, the immersion nozzle is connected to the top of the trapezoidal distributor cavity to allow the casting liquid to flow in.

[0010] Optionally, the upper surface of the conical guide is also provided with lifting lugs to install and fix the conical guide into the trapezoidal distributor cavity.

[0011] Optionally, the four walls of the lower chamber of the distributor are designed as a tapered structure that gradually narrows towards the center, so that the molten casting flowing out through the guide hole can flow down the inclined wall and avoid directly impacting the surface of the molten pool.

[0012] Optionally, multiple baffles are arranged at the bottom of the lower chamber of the distributor to buffer the inflow of molten casting and further reduce the fluctuation of the liquid surface in the molten pool.

[0013] The beneficial effects of this invention are as follows: The molten casting is dispersed around the upper chamber of the distributor by the conical guide, flows down the four walls of the lower chamber of the distributor after passing through the guide holes, and converges at the bottom of the lower chamber of the distributor. Finally, it flows into the molten pool through the bottom distribution holes. Throughout the process, the molten casting flows along the inclined plane. The flow state of the molten casting is adjusted by first diverting and then converging the flow, avoiding direct impact on the liquid surface and causing violent flow field fluctuations. This improves the stability and uniformity of the distribution, as well as the uniformity of the temperature, and greatly improves the quality of the thin strip.

[0014] Other advantages, objectives, and features of this invention will be set forth in the following description, and to some extent will be apparent to those skilled in the art from the following examination, or may be derived from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 Sectional view along line AA;

[0018] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0019] Reference numerals: 1—Distributor cavity, 2—Conical guide, 3—Immersion nozzle, 4—Casting roll, 5—Molten pool, 6—Side sealing plate, 11—Upper chamber of distributor, 12—Lower chamber of distributor, 13—Baffle, 14—Distribution hole, 21—Guide hole, 22—Lifting lug. Detailed Implementation

[0020] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] This embodiment provides a composite molten pool distribution device for thin strip casting and rolling, designed to reduce turbulence and surface fluctuations caused by the vertical impact of the molten casting, thereby stabilizing the flow field and ensuring uniform temperature distribution, thus improving the production quality of cast and rolled thin strips. The detailed structure and working principle of this embodiment will be described below with reference to the accompanying drawings.

[0024] Please see Figures 1-3 This is a composite molten pool distribution device for thin strip casting and rolling, mainly comprising a distributor cavity 1, a conical guide 2, and an immersion nozzle 3.

[0025] The distributor cavity 1 has a trapezoidal structure, and its interior is divided into an upper distributor chamber 11 and a lower distributor chamber 12 by a conical guide 2. The two chambers are connected to each other at the boundary by a stepped structure, which supports the conical guide 2. A distribution hole 14 is opened at the bottom of the lower distributor chamber 12, through which the molten casting flows into the molten pool 5. The four walls of the lower distributor chamber 12 are designed as a tapered structure that gradually narrows towards the center, so that the molten casting flowing out of the guide hole can flow down the inclined walls, avoiding direct impact on the surface of the molten pool. Multiple baffles 13 are arranged at the bottom of the lower distributor chamber 12 to buffer the inflow of molten casting and further reduce surface fluctuations in the molten pool.

[0026] The conical guide 2 is a square pyramid with a uniform wall thickness, narrow at the top and wide at the bottom. It is located inside the upper chamber 11 of the distributor and directly below the submersible nozzle 3. Several guide holes 21 are provided around the lower perimeter of the conical guide 2 to disperse the casting liquid around the upper chamber 11 of the distributor. The upper surface of the conical guide 2 is also provided with lifting lugs 22 to install and fix the conical guide 2 inside the trapezoidal distributor cavity 1.

[0027] The immersion nozzle 3 is connected to the top of the trapezoidal distributor cavity 1, allowing the casting liquid to flow in.

[0028] The working principle of this utility model is as follows:

[0029] During the continuous twin-roll thin strip casting process, high-temperature molten metal flows into the upper chamber 11 of the distributor cavity 1 through the immersion nozzle 3. Inside the upper chamber 11, the molten metal is first diverted to its perimeter by the conical guide 2, and then enters the lower chamber 12 through the guide hole 21. In the lower chamber 12, the molten metal flows obliquely down the four walls and converges at the bottom. Finally, the molten metal flows smoothly into the molten pool 5, composed of the casting roll 4 and the side sealing plate 6, through the distribution hole 14.

[0030] Throughout the entire flow distribution process, the molten casting flows along an inclined plane, with its flow state adjusted by first diverting and then converging the flow. This method effectively avoids the violent flow field fluctuations caused by the molten casting directly impacting the molten pool surface, improving the stability and uniformity of the flow distribution. Simultaneously, because the molten casting receives sufficient buffering and stabilization within the lower chamber 12 of the distributor, temperature uniformity is also improved, thereby significantly enhancing the quality of the thin strip.

[0031] The composite melt pool distribution device for thin strip casting and rolling in this embodiment effectively improves the stability and uniformity of the molten casting flow through optimized structural design, providing strong support for improving the production efficiency and product quality of twin-roll thin strip continuous casting and rolling technology.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A composite molten pool distribution device for thin strip casting and rolling, characterized in that: It includes a trapezoidal distributor cavity, a conical guide, and an immersion nozzle. The trapezoidal distributor cavity is divided into an upper distributor chamber and a lower distributor chamber by the conical guide. The two chambers are connected to each other at the boundary by a stepped structure, which supports the conical guide. Several guide holes are opened at the lower periphery of the conical guide to disperse the molten casting to the periphery of the upper distributor chamber. A distribution hole is opened at the bottom of the lower distributor chamber, through which the molten casting flows into the molten pool. Throughout the entire distribution process, after the molten casting flows in from the submersible nozzle, it is first diverted by the conical guide to the upper chamber of the distributor, then enters the lower chamber of the distributor through the guide holes, and flows obliquely down the four walls to the bottom to converge. Finally, it flows smoothly into the molten pool through the distribution holes, achieving a stable and uniform distribution of the molten casting.

2. The composite molten pool distribution device for thin strip casting and rolling according to claim 1, characterized in that: The conical guide is a square pyramid with equal wall thickness, narrow at the top and wide at the bottom. It is located in the upper chamber of the distributor and directly below the submersible nozzle.

3. The composite molten pool distribution device for thin strip casting and rolling according to claim 1, characterized in that: The immersion nozzle is connected to the top of the trapezoidal distributor cavity, allowing the casting liquid to flow in.

4. The composite molten pool distribution device for thin strip casting and rolling according to claim 1, characterized in that: The upper surface of the conical flow guide is also provided with lifting lugs so that the conical flow guide can be installed and fixed in the trapezoidal flow distributor cavity.

5. The composite molten pool distribution device for thin strip casting and rolling according to claim 1, characterized in that: The lower chamber of the distributor is designed with four walls in a tapered structure that gradually narrows towards the center, allowing the molten casting flowing out through the guide holes to flow down the inclined walls and avoid directly impacting the surface of the molten pool.

6. The composite molten pool distribution device for thin strip casting and rolling according to claim 1, characterized in that: Multiple baffles are arranged at the bottom of the lower chamber of the distributor to buffer the inflow of molten casting and further reduce the fluctuation of the liquid surface in the molten pool.

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