A long nozzle of a crack preventing type
By installing a buffer composite component and an anchoring component inside the long sprue, the problem of glaze cracking due to temperature differences is solved, achieving anti-cracking effect of the glaze and improving the stability and service life of the long sprue.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU WANGXIN REFRACTORIES CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-06-05
AI Technical Summary
Long nozzles can cause glaze to crack due to temperature differences during use, affecting service life and production stability. Existing technologies are unable to effectively prevent glaze damage.
The system combines a buffer composite component and an anchoring component. The buffer composite component achieves temperature uniformity through gradient honeycomb pores, a nano-thermal conductive coating, and buffer filler. The anchoring component enhances the bond between the glaze and the inner wall of the long nozzle through embossed patches and anchoring agents.
It effectively prevents glaze cracking, improves the stability and service life of long nozzles, reduces thermal stress damage to the glaze layer, and enhances overall performance.
Smart Images
Figure CN224322353U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of long water inlets, and in particular to a glaze-resistant long water inlet. Background Technology
[0002] In the continuous casting production process, the long nozzle, as a key refractory component connecting the ladle and the tundish, undertakes the important task of guiding the safe and stable transportation of molten steel. Its working environment is extremely harsh. In actual use, it must continuously withstand multiple effects such as the scouring of high-temperature molten steel, thermal shock, and chemical corrosion. Therefore, a glaze-coated crack-resistant long nozzle is particularly needed.
[0003] Because long nozzles are generally coated with glaze on their inner walls to enhance their corrosion resistance and protect the nozzle body, during use, the significant temperature difference between the ladle end and the tundish end leads to uneven thermal stress distribution, which easily causes the glaze to crack and peel off. Once the glaze is damaged, the long nozzle body will be directly exposed to the corrosion of high-temperature molten steel and slag, which not only shortens the service life of the long nozzle and increases the replacement frequency and production cost, but also affects the continuity and stability of continuous casting production.
[0004] To address the aforementioned issues, a glaze-crack-resistant long sprue is proposed. Utility Model Content
[0005] The purpose of this invention is to provide a glaze crack-resistant long sprue to solve the problem of the existing glaze crack-resistant long sprue mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a glaze anti-crack type long nozzle, including a long nozzle steel ladle end, a long nozzle intermediate transition section is provided at the bottom of the long nozzle steel ladle end, and a long nozzle intermediate ladle end is provided below the long nozzle intermediate transition section at the bottom of the long nozzle intermediate transition section.
[0007] The interior of the long water inlet ladle end, the long water inlet intermediate transition section, and the long water inlet intermediate tundish end are all equipped with buffer composite components, and the inner walls of the long water inlet ladle end, the long water inlet intermediate transition section, and the long water inlet intermediate tundish end are equipped with anchoring components.
[0008] Preferably, the buffer composite component includes honeycomb pores uniformly arranged inside the long nozzle ladle end, the intermediate transition section of the long nozzle, and the intermediate ladle end of the long nozzle, respectively. The inside of each honeycomb pore is filled with buffer filler, and the inner wall of each honeycomb pore is coated with a nano thermally conductive coating.
[0009] Preferably, the size and distribution density of the honeycomb pores vary in a gradient order from the long nozzle ladle end, the intermediate transition section of the long nozzle, to the intermediate tundish end of the long nozzle. The pores at the long nozzle ladle end are smaller and densely distributed, the pores at the intermediate transition section of the long nozzle are of moderate size and density, and the pores at the intermediate tundish end of the long nozzle are larger and sparsely distributed.
[0010] Preferably, a small gap is reserved between the buffer filler and the honeycomb pores to form an air insulation layer, and the buffer filler is a composite material of aerogel and elastic fiber.
[0011] Preferably, the anchoring assembly includes convex and concave patches regularly arranged on the inner walls of the long sprue ladle end, the intermediate transition section of the long sprue, and the intermediate ladle end of the long sprue. The protruding end of the convex and concave patch has a first blind hole, and the concave end of the convex and concave patch has a second blind hole.
[0012] Preferably, the convex and concave patches are arranged in four groups with the axis of the long sprue steel ladle as the center, and the protruding parts and the recessed parts of adjacent convex and concave patches are fitted together.
[0013] Preferably, the first blind hole and the second blind hole of the embossed patch are located in corresponding positions and are two adjacent sets of embossed patches. The first blind hole and the second blind hole are filled with an anchoring agent with a composition similar to that of the glaze but with higher bonding strength. When the glaze is applied subsequently, the glaze penetrates into the gap between the embossed patches and into the first blind hole and the second blind hole, and fully combines with the anchoring agent.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. The buffer composite component, through gradient honeycomb pores, a nano thermally conductive coating with dynamically adjustable thermal conductivity, and a buffer filler and air insulation layer composed of aerogel and elastic fiber, synergistically achieves a balanced temperature distribution inside the long nozzle, effectively reducing thermal stress, slowing down heat conduction, and improving thermal insulation performance. At the same time, the elastic deformation of the buffer filler absorbs and disperses stress, preventing glaze cracking and damage to the long nozzle body, thereby improving the overall stability and reliability of the long nozzle and extending its service life.
[0016] 2. The raised and recessed patches in the anchoring assembly are regularly arranged on the inner wall of the long gate. The protruding parts of adjacent raised and recessed patches fit together. The first and second blind holes are filled with an anchoring agent with a similar composition to the glaze but with a higher bonding strength. When the glaze is applied, the glaze penetrates into the gaps between the raised and recessed patches and into the blind holes, and fully combines with the anchoring agent, making the bond between the glaze and the inner wall of the long gate more firm, effectively preventing the glaze from falling off, and improving the stability of the long gate structure.
[0017] 3. The buffer composite component and the anchoring component complement each other. The heat dissipation and buffer structure reduces the damage of thermal stress to the glaze layer, while the anchoring structure ensures that the glaze layer does not fall off under certain thermal stress and external force. Together, they achieve crack prevention of the glaze of the long nozzle and improve the overall performance and service life of the long nozzle. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a cross-sectional view of the buffer composite component of this utility model;
[0020] Figure 3 This is a schematic diagram of the disassembled cross-sectional structure of the anchoring component of this utility model;
[0021] Figure 4 This utility model Figure 2 A magnified structural diagram of point A in the middle.
[0022] In the figure: 1. Long nozzle steel ladle end; 2. Long nozzle intermediate transition section; 3. Long nozzle intermediate ladle end; 4. Buffer composite component; 401. Honeycomb pores; 402. Buffer filler; 403. Nano thermally conductive coating; 5. Anchoring component; 501. Concave-convex patch; 502. First blind hole; 503. Second blind hole. Detailed Implementation
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0024] Example
[0025] like Figure 1 , 2 As shown in Figure 4, the device includes a long nozzle steel ladle end 1, a long nozzle intermediate transition section 2 at the bottom of the long nozzle steel ladle end 1, a long nozzle intermediate ladle end 3 located below the long nozzle intermediate transition section 2, a buffer composite component 4 inside the long nozzle steel ladle end 1, the long nozzle intermediate transition section 2 and the long nozzle intermediate ladle end 3, and an anchoring component 5 on the inner wall of the long nozzle steel ladle end 1, the long nozzle intermediate transition section 2 and the long nozzle intermediate ladle end 3. The buffer composite component 4 includes honeycomb holes 401 evenly distributed inside the long nozzle steel ladle end 1, the long nozzle intermediate transition section 2 and the long nozzle intermediate ladle end 3, the honeycomb holes 401 are filled with buffer filler 402, and the inner wall of the honeycomb holes 401 is coated with a nano thermally conductive coating 403.
[0026] It should be noted that in this embodiment, the long nozzle is composed of a long nozzle ladle end 1, a long nozzle intermediate transition section 2, and a long nozzle intermediate ladle end 3 connected sequentially. The long nozzle ladle end 1 connects to the ladle and receives the high-temperature molten steel; the long nozzle intermediate transition section 2 is located in the middle and serves as a transition and guide; the long nozzle intermediate ladle end 3 connects to the intermediate ladle and smoothly transports the molten steel to the intermediate ladle. Each part is equipped with a buffer composite component 4, and the inner wall is arranged with anchoring components 5. Molten steel flows in from the long nozzle ladle end 1, where the temperature is the highest. The honeycomb pores 401 are small in size and densely distributed. The nano-thermal conductive coating 403 coated on the inner wall accelerates the heat transfer to the pores. The buffer filler 402, an aerogel and elastic fiber composite material, slows down the heat conduction to the long nozzle body due to its low thermal conductivity, while the tiny gaps between the buffer filler 402 and the honeycomb pores 401 also contribute to the heat transfer. The gaps form an air insulation layer, further blocking heat. As the molten steel flows towards the intermediate transition section 2 and the tundish end 3 of the long nozzle, the size and density of the honeycomb pores 401 change in a gradient. The size and density of the pores in the intermediate transition section 2 of the long nozzle are moderate, playing a transitional and regulating role in heat conduction. The pores in the tundish end 3 of the long nozzle are large and sparsely distributed, which is conducive to heat dissipation. The nano thermally conductive coating 403 dynamically adjusts the thermal conductivity according to the temperature of each part, achieving overall temperature balance of the long nozzle and reducing thermal stress. When the long nozzle generates stress due to thermal expansion and contraction, the high elasticity of the buffer filler 402 comes into play. With the tiny gaps between it and the honeycomb pores 401, the buffer filler 402 can elastically deform, absorb and disperse stress, avoid stress concentration on the long nozzle body and glaze, and prevent the glaze from cracking due to excessive stress.
[0027] like Figure 3 As shown, the anchoring component 5 includes convex and concave patches 501 arranged regularly on the inner walls of the long water inlet steel ladle end 1, the long water inlet intermediate transition section 2 and the long water inlet intermediate ladle end 3. The protruding end of the convex and concave patch 501 is provided with a first blind hole 502, and the concave end of the convex and concave patch 501 is provided with a second blind hole 503.
[0028] It should be noted that, in this embodiment, on the inner walls of the long nozzle ladle end 1, the long nozzle intermediate transition section 2, and the long nozzle intermediate ladle end 3, four sets of concave-convex patches 501 are regularly arranged with the axis of the long nozzle ladle end 1 as the center. The concave-convex patches 501 respectively conform to the curvature of the long nozzle ladle end 1, the long nozzle intermediate transition section 2, and the long nozzle intermediate ladle end 3. The protrusions and depressions of adjacent concave-convex patches 501 interlock with each other to form a mechanical interlocking structure. When molten steel washes the inner wall, this interlocking structure restricts the glaze. The layers slide to prevent them from being washed away by molten steel. The first blind hole 502 of the adjacent raised and recessed patches 501 is located at the protruding end and the second blind hole 503 is located at the recessed end. The two blind holes are filled with an anchoring agent with a similar composition to the glaze but with higher bonding strength. When the glaze is applied, the glaze penetrates into the gap between the raised and recessed patches 501, the first blind hole 502 and the second blind hole 503, and fully combines with the anchoring agent to further strengthen the connection between the glaze layer and the inner wall of the long nozzle, so that the glaze layer can better withstand the scouring of molten steel and thermal stress.
[0029] Working principle of this utility model:
[0030] Refer to the instruction manual appendix Figure 1-4 The long nozzle is composed of a long nozzle ladle end 1, a long nozzle intermediate transition section 2, and a long nozzle tundish end 3 connected sequentially. The long nozzle ladle end 1 connects to the ladle and receives the high-temperature molten steel. The long nozzle intermediate transition section 2 is located in the middle and serves as a transition and guide. The long nozzle tundish end 3 connects to the tundish and smoothly transports the molten steel to the tundish. Each part is equipped with a buffer composite component 4, and the inner wall is arranged with anchoring components 5. Molten steel flows in from the long nozzle ladle end 1, where the temperature is the highest. The honeycomb pores 401 are small in size and densely distributed. The nano thermally conductive coating 403 on the inner wall accelerates the heat transfer into the pores. The buffer filler 402, an aerogel and elastic fiber composite material, slows down the heat conduction to the long nozzle body due to its low thermal conductivity, and at the same time, forms air between the small gaps between the honeycomb pores 401. The heat insulation layer further blocks heat. As the molten steel flows to the middle transition section 2 and the tundish end 3 of the long nozzle, the size and density of the honeycomb pores 401 change in a gradient. The size and density of the pores in the middle transition section 2 of the long nozzle are moderate, which plays a transitional and regulating role in heat conduction. The pores in the tundish end 3 of the long nozzle are large and sparsely distributed, which is conducive to heat dissipation. The nano thermally conductive coating 403 dynamically adjusts the thermal conductivity according to the temperature of each part, so as to achieve the overall temperature balance of the long nozzle and reduce thermal stress. When the long nozzle generates stress due to thermal expansion and contraction, the high elasticity of the buffer filler 402 plays a role. With the tiny gap between it and the honeycomb pores 401, the buffer filler 402 can elastically deform, absorb and disperse stress, avoid stress concentration on the long nozzle body and glaze, and prevent the glaze from cracking due to excessive stress.
[0031] On the inner walls of the long nozzle ladle end 1, the intermediate transition section 2, and the intermediate ladle end 3, four sets of concave-convex patches 501 are regularly arranged with the axis of the long nozzle ladle end 1 as the center. The protrusions and depressions of adjacent concave-convex patches 501 interlock with each other to form a mechanical interlocking structure. When molten steel washes the inner wall, this interlocking structure restricts the sliding of the glaze layer and prevents it from being washed away by the molten steel. The first blind hole 502 of the adjacent concave-convex patches 501 is located at the protrusion end and the second blind hole 503 is located at the depression end. The two blind holes are filled with an anchoring agent with a similar composition to the glaze but with a higher bonding strength. When the glaze is applied, the glaze penetrates into the gaps between the concave-convex patches 501, the first blind hole 502 and the second blind hole 503, and fully combines with the anchoring agent to further strengthen the connection between the glaze layer and the inner wall of the long nozzle, so that the glaze layer can better withstand the scouring of molten steel and thermal stress.
[0032] The buffer composite component 4 reduces thermal stress at the source, creating a stable temperature environment for the glaze layer. The anchoring component 5 enhances the bonding strength between the glaze layer and the long nozzle body. The two work together to reduce the damage of thermal stress to the glaze layer and ensure that the glaze layer remains firm under thermal stress and molten steel scouring. Together, they achieve glaze crack prevention and improve the service life and performance of the long nozzle.
[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A glaze-resistant anti-crack long nozzle, comprising a long nozzle steel ladle end (1), characterized in that: The bottom of the long water inlet steel ladle end (1) is provided with a long water inlet intermediate transition section (2), and the bottom of the long water inlet intermediate transition section (2) is provided with a long water inlet intermediate ladle end (3). The long water inlet steel ladle end (1), the long water inlet intermediate transition section (2) and the long water inlet intermediate ladle end (3) are all provided with buffer composite components (4), and the inner walls of the long water inlet steel ladle end (1), the long water inlet intermediate transition section (2) and the long water inlet intermediate ladle end (3) are provided with anchoring components (5).
2. The glaze-resistant anti-cracking long sprue according to claim 1, characterized in that: The buffer composite component (4) includes honeycomb holes (401) evenly distributed inside the long nozzle steel ladle end (1), the long nozzle intermediate transition section (2) and the long nozzle intermediate ladle end (3), respectively. The honeycomb holes (401) are filled with buffer filler (402), and the inner wall of the honeycomb holes (401) is coated with a nano thermally conductive coating (403).
3. The glaze-crack-resistant long sprue according to claim 2, characterized in that: The size and distribution density of the honeycomb holes (401) vary in a gradient order from the long nozzle steel ladle end (1), the long nozzle intermediate transition section (2), to the long nozzle intermediate ladle end (3). The holes at the long nozzle steel ladle end (1) are smaller and denser, the holes at the long nozzle intermediate transition section (2) are of moderate size and density, and the holes at the long nozzle intermediate ladle end (3) are larger and sparser.
4. The glaze-crack-resistant long sprue according to claim 2, characterized in that: The buffer filler (402) and the honeycomb pores (401) are both reserved with tiny gaps to form an air insulation layer, and the buffer filler (402) is a composite material of aerogel and elastic fiber.
5. The glaze-resistant anti-crack long nozzle according to claim 1, characterized in that: The anchoring component (5) includes a series of irregularly arranged convex and concave patches (501) on the inner walls of the long water inlet steel ladle end (1), the long water inlet intermediate transition section (2) and the long water inlet intermediate ladle end (3). The protruding end of the convex and concave patch (501) is provided with a first blind hole (502) and the recessed end of the convex and concave patch (501) is provided with a second blind hole (503).
6. The glaze-crack-resistant long sprue according to claim 5, characterized in that: The convex and concave patches (501) are arranged in four groups with the axis of the long sprue steel ladle end (1) as the center, and the protruding and concave parts of adjacent convex and concave patches (501) are fitted together.
7. The glaze-resistant anti-cracking long sprue according to claim 5, characterized in that: The first blind hole (502) and the second blind hole (503) of the embossed patch (501) are in corresponding positions and are two adjacent sets of embossed patches (501). The first blind hole (502) and the second blind hole (503) are filled with an anchoring agent that is similar in composition to the glaze but has a higher bonding strength. When the glaze is applied later, the glaze penetrates into the gap between the embossed patches (501) and into the first blind hole (502) and the second blind hole (503) to fully combine with the anchoring agent.