Wire drawing steel continuous casting crystallizer

Abstract

The utility model provides a kind of wire-drawing steel continuous casting crystallizer, including machine body, the machine body includes inner sleeve and outer sleeve, space is left between the inner sleeve, outer sleeve;The top of the machine body is fixedly connected with top mouth, and the bottom of the machine body is fixedly connected with bottom mouth.The utility model has the advantages that: make full use of the space between inner sleeve and outer sleeve, and design more capillary second cooling pipe, realize the purpose that inner sleeve is cooled sufficiently, and the heat exchange area of inner sleeve and cooling water is further increased, so that the performance of inner sleeve cooling molten steel is further enhanced.It also has the following effects: heat exchange area is doubled: the cladding structure greatly improves the contact area of primary cooling, and the heat exchange efficiency is high;Extension plate system greatly expands the secondary cooling area, and the overall heat exchange coefficient is greatly improved.Thermal equilibrium optimization: when the drawing speed is constant, the thickness of the billet shell increases as it exits the crystallizer;The surface temperature gradient of inner sleeve is reduced, and the service life is greatly extended.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking equipment technology, and in particular to a continuous casting crystallizer for wire drawing steel. Background Technology

[0002] In the continuous casting production of wire-drawn steel (such as high-carbon steel wire and steel cord), the crystallizer, as the core equipment for initial solidification, directly determines the quality of the cast billet, production efficiency, and equipment lifespan through its cooling performance and operational stability. However, traditional wire-drawn steel continuous casting crystallizers face several bottlenecks in practical applications:

[0003] Insufficient cooling efficiency and temperature gradient issues: Existing crystallizers mostly employ cooling methods with straight grooves or parallel straight cooling water pipes embedded inside the copper inner sleeve. In this method, the contact area between the cooling pipes and the copper inner sleeve is limited, resulting in low heat exchange efficiency. This is especially problematic for wire-drawing steel, which has a wide solidification range and high susceptibility to hot cracking. Uneven cooling often leads to a sharp increase in the temperature gradient on the surface and corners of the billet, easily causing surface defects such as cracks and dents. Simultaneously, the upper limit of cooling capacity restricts the increase in casting speed, thus hindering production efficiency. Therefore, a new continuous casting crystallizer for wire-drawing steel is proposed to address these issues. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to provide a continuous casting crystallizer for wire drawing steel to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of the present invention provides a continuous casting crystallizer for wire drawing steel, including a body, wherein the body further includes an inner sleeve and an outer sleeve, and a space is left between the inner sleeve and the outer sleeve;

[0007] The top of the machine body is fixedly connected to a top opening, and the bottom of the machine body is fixedly connected to a bottom opening;

[0008] The inner wall of the inner sleeve is in contact with the molten steel. Several water inlet pipes are fixedly connected to the outer side of the machine body, and several water outlet pipes are fixedly connected to the outer side of the machine body. Each water inlet pipe and each water outlet pipe is set as a group.

[0009] The outer surface of the inner sleeve is fixedly connected to a covering, the covering is arc-shaped, and the inner side of the covering is fixedly connected to a first cooling pipe.

[0010] The outer surface of the inner sleeve is fixedly connected to several extension plates, and several coverings are fixedly connected to both sides of the extension plates. The inner side of the coverings is fixedly connected to a second cooling pipe, and the water inlet pipe is connected to the corresponding first cooling pipe and second cooling pipe after being split.

[0011] Preferably, in any of the above embodiments, the body is a straight crystallizer, and the surfaces of the inner and outer sleeves are both nickel-plated.

[0012] The above technical solution is adopted: This crystallizer is straight and is specially used for the rapid cooling and solidification of molten steel continuously poured for wire drawing, forming a primary billet shell with a specified cross-sectional shape and a certain thickness.

[0013] The device consists of the following components: the body is made of copper, which has good thermal conductivity. The inner and outer sleeves are nickel-plated to improve wear resistance and corrosion resistance. The inner wall of the inner sleeve is in direct contact with the molten steel, exchanging heat and rapidly cooling the steel. The cooling source is cooling water pumped into the inlet pipe by a water pump.

[0014] The core structure of this device consists of: inner sleeve, outer sleeve, inlet pipe, outlet pipe, covering component, first cooling pipe, extension plate, and second cooling pipe.

[0015] The cladding is semi-enclosed or fully enclosed, which greatly increases the contact area and heat exchange area between the first cooling pipe and the inner sleeve. At the same time, the inner sleeve is connected to multiple extension plates, making full use of the space between the inner and outer sleeves, and designing more capillary second cooling pipes to achieve the purpose of fully cooling the inner sleeve. The heat exchange area between the inner sleeve and the cooling water is further increased, which further enhances the cooling performance of the inner sleeve for molten steel.

[0016] Preferably, the body is made of copper, and the inner sleeve is provided with four sets of cooling mechanisms around its perimeter. Each set of cooling mechanisms includes an inlet pipe, an outlet pipe, several first cooling pipes, and several second cooling pipes.

[0017] The continuous casting crystallizer for wire drawing steel includes: a copper body consisting of a double-layer structure with an inner sleeve (25mm thick) and an outer sleeve (15mm thick). The inner sleeve's working surface has a 0.3mm thick nickel plating layer with a microhardness of HV450. The top and bottom openings are: a Φ200mm funnel-shaped inlet area at the top, and a 150×150mm square billet outlet at the bottom, with a coaxiality error of ≤0.1mm.

[0018] Cooling system: 4 sets of symmetrically distributed inlet pipes (DN40) and outlet pipes (DN50), each set connecting 18 first cooling pipes (Φ8×1mm) and 24 second cooling pipes (Φ6×0.8mm).

[0019] Core Component Details: Encased Cooling Module: An arc-shaped cladding (H62 brass, 120mm arc length) is welded to the outer surface of the inner sleeve. Twelve parallel-arranged first cooling pipes are tightly fitted to its inner wall, increasing the contact area by 210% compared to traditional straight pipes. Vacuum brazing is used between the cladding and the inner sleeve, increasing the thermal conductivity to 380W / (m·K).

[0020] Extension plate reinforcement structure: Extension plates (6mm thick copper plates) are vertically welded at 30° intervals along the circumference of the inner sleeve, and cladding parts are welded to both sides to form airfoil cooling units. Each extension plate is connected to 6 sets of second cooling pipes with a pipe spacing of 15mm, covering 80% of the space between the inner and outer sleeves.

[0021] Staged cooling channels: Cooling water enters the distributor from the inlet pipe and is divided into two flow rates of 2:3. Primary cooling circuit: The first cooling pipe is arranged along the inner sleeve axis with a flow velocity of 2.5m / s, directly absorbing the heat of the inner sleeve. Secondary cooling circuit: The second cooling pipe and extension plate have a flow velocity of 1.8m / s, which enhances heat exchange in the gap area.

[0022] Working principle: Molten steel is injected into the inner sleeve cavity from the top opening (temperature 1580℃), and rapid solidification is achieved through the following mechanisms: Direct cooling: The inner wall of the inner sleeve transfers the heat of the molten steel to the cladding through heat conduction; Primary heat exchange: 20℃ soft water flows in the first cooling pipe at a pressure of 450kPa, absorbing 65% of the heat transferred by the inner sleeve; Secondary heat exchange: The second cooling pipe absorbs the convective heat (about 30%) in the gap and the heat conducted by the extension plate (5%); The cooling water heated to 45℃ returns to the circulation system through the outlet pipe.

[0023] Preferably, in any of the above schemes, the covering is welded to the inner sleeve, and the covering is welded to both the first cooling pipe and the second cooling pipe.

[0024] Preferably, in any of the above embodiments, the extension plate is perpendicular to the surface of the inner sleeve, and the extension plate is welded to the inner sleeve.

[0025] Preferably, in any of the above embodiments, the extension plate is located in the gap of the inner sleeve surface covering.

[0026] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0027] This continuous casting crystallizer for wire drawing steel consists of an inner sleeve, an outer sleeve, an inlet pipe, an outlet pipe, a cladding, a first cooling pipe, extension plates, and a second cooling pipe. The cladding is either semi-enclosed or fully enclosed, significantly increasing the contact area and heat exchange area between the first cooling pipe and the inner sleeve. Simultaneously, the inner sleeve connects to multiple extension plates, fully utilizing the space between the inner and outer sleeves. Furthermore, the design incorporates more capillary second cooling pipes, achieving thorough cooling of the inner sleeve. This further increases the heat exchange area between the inner sleeve and the cooling water, thus enhancing the cooling performance of the molten steel and resulting in high heat exchange efficiency.

[0028] It also has the following specific effects: increased heat exchange area: the covering structure greatly increases the primary cooling contact area; the extension plate system greatly expands the secondary cooling area, and the overall heat transfer coefficient is greatly improved.

[0029] Thermal balance optimization: When the drawing speed is constant, the thickness of the billet shell exiting the crystallizer increases; the temperature gradient on the inner sleeve surface decreases, and the service life is greatly extended.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0033] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0034] Figure 3 This is a partial structural diagram of the inner sleeve of this utility model;

[0035] Figure 4 This is a schematic diagram of the distribution structure of the cooling pipe of this utility model.

[0036] In the diagram: 1-body, 2-inner sleeve, 3-outer sleeve, 4-top opening, 5-bottom opening, 6-inlet pipe, 7-outlet pipe, 8-covering component, 9-first cooling pipe, 10-extension plate, 11-second cooling pipe. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] like Figure 1-4 As shown, this continuous casting crystallizer for wire drawing steel includes a body 1, which in turn includes an inner sleeve 2 and an outer sleeve 3, with a space between the inner sleeve 2 and the outer sleeve 3.

[0040] The top of the body 1 is fixedly connected to a top opening 4, and the bottom of the body 1 is fixedly connected to a bottom opening 5;

[0041] The inner wall of the inner sleeve 2 is in contact with the molten steel. Several water inlet pipes 6 are fixedly connected to the outer side of the machine body 1, and several water outlet pipes 7 are fixedly connected to the outer side of the machine body 1. A single water inlet pipe 6 and a single water outlet pipe 7 are set as a group.

[0042] The outer surface of the inner sleeve 2 is fixedly connected to a covering 8, which is arc-shaped, and the inner side of the covering 8 is fixedly connected to a first cooling pipe 9.

[0043] Several extension plates 10 are fixedly connected to the outer surface of the inner sleeve 2. Several covering parts 8 are fixedly connected to both sides of the extension plates 10. A second cooling pipe 11 is fixedly connected to the inner side of the covering parts 8. The water inlet pipe 6 is connected to the corresponding first cooling pipe 9 and second cooling pipe 11 after being diverted.

[0044] Example 1: The machine body 1 is a straight crystallizer, and the inner sleeve 2 and outer sleeve 3 are both nickel-plated. This crystallizer is straight and is specifically used for the rapid cooling and solidification of continuously poured molten steel for wire drawing, forming a primary billet shell with a specified cross-sectional shape and a certain thickness.

[0045] The device consists of the following components: Body 1 is made of copper, which has good thermal conductivity. The inner sleeve 2 and outer sleeve 3 are nickel-plated to improve wear resistance and corrosion resistance. The inner wall of the inner sleeve 2 is in direct contact with the molten steel, exchanging heat and rapidly cooling the steel. The cooling source is cooling water pumped into the inlet pipe 6. The core structure of this device is: inner sleeve 2, outer sleeve 3, inlet pipe 6, outlet pipe 7, covering component 8, first cooling pipe 9, extension plate 10, and second cooling pipe 11. The covering component 8 is semi-enclosed or fully enclosed, greatly increasing the contact area and heat exchange area between the first cooling pipe 9 and the inner sleeve 2. Simultaneously, the inner sleeve 2 connects to multiple extension plates 10, fully utilizing the space between the inner sleeve 2 and outer sleeve 3, and incorporating more capillary second cooling pipes 11 to achieve thorough cooling of the inner sleeve 2. The heat exchange area between the inner sleeve 2 and the cooling water is further increased, thus enhancing the cooling performance of the inner sleeve 2. The body 1 is made of copper. The inner sleeve 2 has four sets of cooling mechanisms around its perimeter. Each cooling mechanism includes an inlet pipe 6, an outlet pipe 7, several first cooling pipes 9, and several second cooling pipes 11. The covering 8 is welded to the inner sleeve 2, and the covering 8 is also welded to the first cooling pipes 9 and second cooling pipes 11. The extension plate 10 is perpendicular to the surface of the inner sleeve 2 and is welded to the inner sleeve 2. The extension plate 10 is located within the gaps in the covering 8 on the surface of the inner sleeve 2.

[0046] Example 2: The continuous casting crystallizer for wire drawing steel includes: a copper body 1, consisting of an inner sleeve 2 (25mm thick) and an outer sleeve 3 (15mm thick) forming a double-layer structure. The working surface of the inner sleeve 2 is nickel-plated with a thickness of 0.3mm and a microhardness of HV450. Top opening 4 and bottom opening 5: the top opening has a Φ200mm funnel-shaped inlet area, and the bottom opening is a 150×150mm square billet outlet, with a coaxiality error of ≤0.1mm. Cooling system: four sets of symmetrically distributed inlet pipes 6 (DN40) and outlet pipes 7 (DN50), each set connecting 18 first cooling pipes 9 (Φ8×1mm) and 24 second cooling pipes 11 (Φ6×0.8mm).

[0047] Core Component Details: Encased Cooling Module: An arc-shaped cladding 8 (made of H62 brass, arc length 120mm) is welded to the outer surface of the inner sleeve 2. Twelve parallel-arranged first cooling pipes 9 are tightly fitted to its inner wall, increasing the contact area by 210% compared to traditional straight pipes. Vacuum brazing is used between the cladding 8 and the inner sleeve 2, increasing the thermal conductivity to 380W / (m·K).

[0048] Extension plate reinforcement structure: Extension plates 10 (6mm thick copper plates) are vertically welded at 30° intervals around the inner sleeve 2, and cladding parts 8 are welded on both sides to form airfoil cooling units. Each extension plate is connected to 6 sets of second cooling pipes 11 with a pipe spacing of 15mm, covering 80% of the space between the inner sleeve 2 and the outer sleeve 3.

[0049] Staged cooling channels: Cooling water enters the distributor from the inlet pipe 6 and is divided into two flow rates of 2:3. Primary cooling circuit: The first cooling pipe 9 is arranged along the inner sleeve axis with a flow velocity of 2.5 m / s, directly absorbing the heat of the inner sleeve. Secondary cooling circuit: The second cooling pipe 11 and the extension plate 10 have a flow velocity of 1.8 m / s, which enhances heat exchange in the gap area.

[0050] Example 3: A continuous casting crystallizer for wire drawing steel includes a cylindrical body 1 made of copper, with an inner sleeve 2 of 25mm thickness and an outer sleeve 3 of 15mm thickness, forming an 8mm annular gap between them. The working surface of the inner sleeve 2 is electroplated with nickel, with a nickel layer thickness of 0.3mm and a surface roughness Ra≤0.8μm. The top opening 4 is designed as a horn-shaped inlet structure with a diameter of Φ200mm, and the bottom opening 5 is a 150×150mm square billet outlet, with coaxiality controlled within 0.08mm by laser calibration.

[0051] The cooling system comprises four symmetrically distributed DN40 inlet pipes 6 and DN50 outlet pipes 7, each connected to 18 Φ8×1mm first cooling pipes 9 and 24 Φ6×0.8mm second cooling pipes 11. The outer surface of the inner sleeve 2 is welded with a 120° arc length H62 brass cladding part 8, which is metallurgically bonded to the copper substrate using vacuum brazing with BNi-2 filler metal at a brazing temperature of 980℃, resulting in a thermal resistance ≤1.2×10⁻⁶. -5 m2 • K / W interface. Each cladding component has 12 parallel cooling tubes embedded in it, with a tube spacing of 18mm, and the contact area is 2.3 times that of the traditional straight tube arrangement.

[0052] A 6mm thick copper extension plate 10 is welded at 30° intervals along the inner circumference, with airfoil-shaped cladding pieces welded to both sides to form a composite cooling unit. Each extension plate connects to 6 sets of second cooling pipes, covering 85% of the space volume of the annular gap. The cooling water system adopts a staged control, with the primary loop accounting for 40% of the flow rate at a velocity of 2.8m / s and the secondary loop accounting for 60% at a velocity of 2.0m / s, for a total circulation volume of 220m³. 3 / h.

[0053] Example 4: This example optimizes the cooling channel structure, employing a three-stage distribution system: the inlet pipe 6 distributes cooling water in a 45%:35%:20% ratio via a conical distributor. The main cooling circuit includes 24 Φ10×1.2mm first cooling pipes 9, with thermally conductive silicone grease (4.5W / m·K) filling the space between the pipe walls and the covering 8. The extension plate 10 is improved to a honeycomb porous structure with a pore diameter of 3mm and an open area of ​​62%, embedding 48 Φ5×0.6mm microchannel cooling pipes 11, employing a counter-current heat exchange design.

[0054] The working principle of this utility model is as follows:

[0055] Molten steel is injected into the cavity of inner sleeve 2 (temperature 1580℃) from the top opening 4, and rapid solidification is achieved through the following mechanisms: direct cooling: the inner wall of inner sleeve 2 transfers the heat of molten steel to cladding 8 by heat conduction; primary heat exchange: soft water at 20℃ flows in the first cooling pipe 9 at a pressure of 450kPa, absorbing 65% of the heat transferred by the inner sleeve; secondary heat exchange: the second cooling pipe 11 absorbs the convective heat (about 30%) in the gap and the heat conducted by the extension plate (5%); the cooling water heated to 45℃ returns to the circulation system through the outlet pipe 7.

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] This continuous casting crystallizer for wire drawing steel comprises an inner sleeve 2, an outer sleeve 3, an inlet pipe 6, an outlet pipe 7, a cladding component 8, a first cooling pipe 9, extension plates 10, and a second cooling pipe 11. The cladding component 8 is either semi-enclosed or fully enclosed, significantly increasing the contact area and heat exchange area between the first cooling pipe 9 and the inner sleeve 2. Simultaneously, the inner sleeve 2 connects to multiple extension plates 10, fully utilizing the space between the inner sleeve 2 and the outer sleeve 3, and incorporating more capillary second cooling pipes 11 to achieve thorough cooling of the inner sleeve 2. The heat exchange area between the inner sleeve 2 and the cooling water is further increased, thus enhancing the cooling performance of the inner sleeve 2 and resulting in high heat exchange efficiency.

[0058] It also has the following specific effects: increased heat exchange area: the covering structure greatly increases the primary cooling contact area; the extension plate system greatly expands the secondary cooling area, and the overall heat transfer coefficient is greatly improved.

[0059] Thermal balance optimization: When the drawing speed is constant, the thickness of the billet shell exiting the crystallizer increases; the temperature gradient on the surface of the inner sleeve 2 is reduced, and the service life is greatly extended.

Claims

1. A continuous casting crystallizer for wire drawing steel, characterized in that, It includes a body (1), which in turn includes an inner sleeve (2) and an outer sleeve (3), with a space between the inner sleeve (2) and the outer sleeve (3); The top of the body (1) is fixedly connected to a top opening (4), and the bottom of the body (1) is fixedly connected to a bottom opening (5). The inner wall of the inner sleeve (2) is in contact with the molten steel. Several water inlet pipes (6) are fixedly connected to the outer side of the machine body (1). Several water outlet pipes (7) are fixedly connected to the outer side of the machine body (1). Each water inlet pipe (6) and each water outlet pipe (7) is set as a group. The outer surface of the inner sleeve (2) is fixedly connected to a covering (8), the covering (8) is arc-shaped, and the inner side of the covering (8) is fixedly connected to a first cooling pipe (9); The outer surface of the inner sleeve (2) is fixedly connected to several extension plates (10), and several covering parts (8) are fixedly connected to both sides of the extension plates (10). The inner side of the covering parts (8) is fixedly connected to a second cooling pipe (11), and the water inlet pipe (6) is connected to the corresponding first cooling pipe (9) and second cooling pipe (11) after being diverted.

2. The continuous casting crystallizer for wire drawing steel as described in claim 1, characterized in that: The body (1) is a straight crystallizer, and the surfaces of the inner sleeve (2) and outer sleeve (3) are both nickel-plated.

3. The continuous casting crystallizer for wire drawing steel as described in claim 2, characterized in that: The body (1) is made of copper. The inner sleeve (2) is provided with four sets of cooling mechanisms around its perimeter. Each set of cooling mechanisms includes an inlet pipe (6), an outlet pipe (7), several first cooling pipes (9) and several second cooling pipes (11).

4. The continuous casting crystallizer for wire drawing steel as described in claim 3, characterized in that: The covering (8) is welded to the inner sleeve (2), and the covering (8) is welded to the first cooling pipe (9) and the second cooling pipe (11).

5. The continuous casting crystallizer for wire drawing steel as described in claim 4, characterized in that: The extension plate (10) is perpendicular to the surface of the inner sleeve (2), and the extension plate (10) is welded to the inner sleeve (2).

6. The continuous casting crystallizer for wire drawing steel as described in claim 5, characterized in that: The extension plate (10) is located in the gap of the inner sleeve (2) surface covering (8).

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