A continuous casting tundish nozzle protection pouring device

Abstract

This utility model discloses a continuous casting tundish nozzle protection pouring device. The air seal holes of the device adopt a ring array design and match the conical contour of the nozzle, which enhances the uniformity of the air curtain coverage and effectively solves the problem of local negative pressure air intake caused by turbulence at the joint of the split nozzle. The ring hollow tube and the metal hose adopt a quick connector to achieve quick disassembly and assembly, so that the device can be replaced within seconds after damage, which significantly shortens the impact time of seal failure and thus extends the effective pouring time of the submersible nozzle. During the pouring process, inert gas is blown out through the air seal holes, which can quickly remove accumulated ash and steel slag, reducing the labor intensity of manual cleaning. Pressing down the handle can open the ring hollow tube, which is convenient for replacing the nozzle.

Description

Technical Field

[0001] This utility model relates to the technical field of tundish casting equipment, specifically a continuous casting tundish tundish protection casting device. Background Technology

[0002] Continuous casting technology, as one of the core processes in modern steel industry, aims to achieve high-quality solidification and forming of molten steel efficiently and stably. The tundish, as a key container for steel distribution and purification in the continuous casting process, directly affects the cleanliness of the continuously cast billet and the continuity of production due to the stability of its internal nozzle system. While traditional integral submerged entry nozzles can achieve physical isolation between molten steel and air, their non-removable structure leads to high replacement costs after nozzle erosion, severely restricting production economics. Therefore, modular nozzle technology has emerged, enabling partial replacement of nozzle components through modular design. However, the resulting problem of protecting against casting defects has become a pain point in the industry.

[0003] Existing split-type nozzle devices face significant technical bottlenecks in application: First, micro-gaps easily form at the joints of the split structure, leading to secondary oxidation caused by contact between molten steel and air. This generates inclusions such as Al2O3, which deposit on the inner wall of the nozzle, inducing turbulence. Statistics show that approximately 15% of surface defects in cast billets originate from this. Second, traditional sealing methods are ill-suited to the thermal expansion effect under high-temperature conditions. Air intake results in a nitrogen increase of 3-5 ppm in the molten steel, severely impacting gas control indicators for high-end steel grades such as automotive steel sheets. Third, the turbulence caused by the split structure exacerbates the erosion rate of the nozzle refractory material, shortening the average lifespan of the submerged entry nozzle to only 6-8 heats. Simultaneously, it causes abnormal wear on the slide rail mechanism, requiring more than 2 hours of downtime for each replacement, severely restricting the continuous casting machine's operating rate, typically below 85%. More importantly, operators need to frequently adjust the nozzle alignment and clean residual steel, resulting in high labor intensity and a risk of high-temperature burns. Utility Model Content

[0004] The purpose of this invention is to provide a continuous casting tundish nozzle protection casting device. Addressing the technical pain points of split-type nozzle protection casting, such as sealing failure, rapid component wear, and complex operation, this invention proposes a modular air-sealed continuous casting tundish nozzle protection casting device. This device achieves efficient sealing and long-life operation of the split-type nozzle through multi-stage air-sealing coupling, a quick-assembly and disassembly mechanism, and turbulence suppression design.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a continuous casting tundish nozzle protection pouring device, comprising an annular hollow tube, a hook buckle, a pressing handle, and a spring.

[0006] The annular hollow tube is composed of two semi-circular hollow tubes. Several air-sealing holes are evenly opened at one end of the semi-circular hollow tubes located at the water inlet. The two semi-circular hollow tubes are connected by a conical joint. Each semi-circular hollow tube has a gas connection hole at the contact end with the conical joint. The end of one semi-circular hollow tube away from the conical joint is the air inlet end. The air inlet end pipeline is connected to the air source metal hose through a quick connector. The other end of the other semi-circular hollow tube away from the conical joint is connected to a fixing rod. The middle part of the fixing rod is hinged to the rigid air inlet end pipeline. The end of the fixing rod away from the hinge is obliquely set, and a pressing handle is connected to its top. A spring is connected to the bottom end of the pressing handle. One end of the spring is connected to the bottom end of the pressing handle, and the other end is connected to the rigid air inlet end pipeline.

[0007] Preferably, it also includes hooks, which are respectively set on the horizontal ends of the air intake pipe and the fixing rod, for hanging on the reserved protrusions.

[0008] Preferably, the quick connector includes a pipe connector, a turntable, a cam clamping plate, and a pressure rod. A guide groove is provided at the connection between the air inlet pipe of the semi-circular hollow tube and the quick connector. A turntable is hinged to the pipe connector and works in conjunction with the guide groove. A groove is provided on the outer circumference of the end of the air inlet pipe away from the guide groove. A cam clamping plate is coaxially arranged on the turntable and works in conjunction with the groove. A pressure rod is connected to the outer circumference of the turntable.

[0009] Preferably, it also includes a gas regulating valve, which is installed on the inlet end of the semi-circular hollow tube to regulate the gas flow rate.

[0010] Preferably, a sealing ring is provided at the connection end of the air inlet pipe of the semi-circular hollow tube and the quick connector.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The device employs a ring array design for its air seal holes, which matches the conical profile of the sprue, enhancing the uniformity of the air curtain coverage. This effectively solves the problem of localized negative pressure air intake caused by turbulence at the joints of split sprue types. A quick connector between the ring hollow tube and the metal hose enables rapid assembly and disassembly, allowing for replacement within seconds in case of device damage. This significantly shortens the impact time of seal failure, thereby extending the effective pouring time of the immersion sprue. During pouring, inert gas is blown out through the air seal holes, quickly removing accumulated ash and steel slag, reducing the labor intensity of manual cleaning. Pressing down the handle opens the ring hollow tube, facilitating sprue replacement. The single assembly and disassembly time is reduced to less than 20 seconds. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the quick connector structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the disassembled structure of the quick connector of this utility model.

[0016] In the diagram: 1. Conical connector; 2. Gas connection hole; 3. Gas seal hole; 4. Annular hollow tube with handle; 5. Hook buckle; 6. Press handle; 7. Spring; 8. Gas regulating valve; 9. Quick connector; 901. Pipe connector; 902. Turntable; 903. Cam clamping plate; 904. Pressure rod; 10. Metal hose; 11. Rotation point. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: Please refer to Figure 1-2One embodiment of this utility model is a continuous casting tundish nozzle protection pouring device, comprising an annular hollow tube 4, a hook buckle 5, a pressing handle 6, and a spring 7.

[0022] The annular hollow tube 4 is composed of two semi-circular hollow tubes, forming an annular air chamber. A continuous inert gas curtain barrier is formed through the air seal hole 3. During the casting process, inert gas is blown through the air seal hole 3, quickly cleaning accumulated ash and slag, reducing manual labor intensity. Field tests show a 70% reduction in steel adhesion. The annular design matches the nozzle taper, and the air curtain evenly covers the joints, eliminating secondary oxidation caused by localized negative pressure air intake. The air curtain protection reduces the erosion rate of the submerged nozzle by 40%, extending the average service life to 12-15 heats and increasing the service time to 7-8 hours. The semi-circular hollow tube is located... A number of air-sealing holes 3 are evenly distributed at one end of the sprue. An annular array of holes sprays inert gas into the sprue joint to dynamically isolate air, ensuring the nitrogen content in the molten steel is ≤1.5ppm, thus improving the cleanliness of high-end steel grades. Two semi-circular hollow tubes are connected by a conical connector 1. The conical connector 1 connects the two semi-circular hollow tubes, and the internal channel is connected to the gas connection hole 2 to achieve pipeline closure and gas diversion. The connector, connection hole, and air-sealing holes 3 form a three-stage sealing structure. Each semi-circular hollow tube has a gas connection hole 2 at its contact end with the conical connector 1, connecting the conical connector 1 and the air chamber of the semi-circular hollow tube, ensuring even gas flow. Gas distribution ensures consistent gas pressure at the gas seal orifice 3, preventing localized air curtain failure. One semi-circular hollow tube has an inlet end furthest from the conical connector 1. The inlet pipe connects to a gas source metal hose 10 via a quick connector 9. The gas source metal hose 10 connects to an inert gas storage tank. Another semi-circular hollow tube has a fixing rod connected to its other end furthest from the conical connector 1. The middle of the fixing rod is hinged to the rigid inlet pipe. The end of the fixing rod furthest from the hinge is angled, and a pressing handle 6 is connected to its top. When changing the water inlet, pressing the pressing handle 6 causes the angled end of the pressing handle 6 to shift, thus... When the spring 7 is pressed down, the horizontal end of the fixed rod is offset by an angle, and the connection between the semi-circular hollow tube connected to the fixed rod and the tapered connector 1 is disconnected. The distance between the two semi-circular hollow tubes increases, the ring opens, and the water inlet is replaced. The bottom end of the pressing handle 6 is connected to the spring 7. The spring 7 is used to provide support for the pressing handle 6. At the same time, when the pressing handle 6 is pressed down, it squeezes the spring 7. When the force of the pressing handle 6 is removed, the spring 7 resets the pressing handle 6. One end of the spring 7 is connected to the bottom end of the pressing handle 6, and the other end is connected to the rigid air inlet pipe.

[0023] It also includes hooks 5, which are respectively set on the horizontal ends of the air inlet pipe and the fixing rod, for hanging on the reserved protrusions. The air inlet pipe and the horizontal ends of the fixing rod are hooked on the protrusions, and the device is placed horizontally and connected to form a ring around the water inlet.

[0024] The quick connector 9 includes a semi-circular hollow tube inlet pipe connected to a metal hose 10 via the quick connector 9. This device allows for rapid replacement within 30 seconds in case of damage, reducing the impact time of seal failure and improving the immersion-type sprue casting time. It includes a pipe connector 901, a turntable 902, a cam clamping plate 903, and a pressure rod 904. A guide groove is provided at the connection between the semi-circular hollow tube inlet pipe and the quick connector 9. A turntable 902 is hinged to the pipe connector 901, and the turntable 902 cooperates with the guide groove. A [missing information - likely a design feature] is provided on the outer circumference of the end of the inlet pipe furthest from the guide groove. A cam clamping plate 903 is coaxially mounted on the turntable 902, and the cam clamping plate 903 cooperates with the groove. A pressure rod 904 is connected to the outer circumference of the turntable 902. During connection, rotating the pressure rod 904 causes the turntable 902 and the cam clamping plate 903 to pass through the guide groove. When the air intake pipe is inserted into the pipe connector 901 and tightly connected to the pipe inside the pipe connector 901, rotating the pressure rod 904 rotates the cam clamping plate 903, causing the protruding end to rotate into the groove and abut against the outer circumference of the groove, thereby connecting the air intake pipe to the quick connector 9.

[0025] It also includes a gas regulating valve 8, which is installed on the inlet pipe of the semi-circular hollow tube to regulate the gas flow rate. The gas flow rate can be adjusted in real time by adjusting the valve opening by 0.5-1.2 m³ / h, which not only avoids excessive gas supply causing bubble defects in the cast billet, but also matches the casting requirements of different steel grades.

[0026] A sealing ring is provided at the connection end of the air inlet pipe of the semi-circular hollow tube and the quick connector 9 to seal the air inlet pipe and the quick connector 9 and prevent gas leakage.

[0027] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A continuous casting tundish nozzle protection pouring device, characterized in that: Includes a ring-shaped hollow tube (4), a hook buckle (5), a pressing handle (6), and a spring (7). The annular hollow tube (4) is composed of two semi-circular hollow tubes. Several air sealing holes (3) are evenly opened at one end of the semi-circular hollow tube located at the water inlet. The two semi-circular hollow tubes are connected by a conical joint (1). Each semi-circular hollow tube has a gas connection hole (2) at the contact end with the conical joint (1). One end of the semi-circular hollow tube away from the conical joint (1) is the air inlet end. The air inlet end pipeline is connected to the air source metal hose (10) through a quick connector (9). The other end of the other semi-circular hollow tube away from the conical joint (1) is connected to a fixing rod. The middle part of the fixing rod is hinged to the rigid air inlet end pipeline. The end of the fixing rod away from the hinge is set obliquely. A pressing handle (6) is connected to its top. A spring (7) is connected to the bottom end of the pressing handle (6). One end of the spring (7) is connected to the bottom end of the pressing handle (6), and the other end is connected to the rigid air inlet end pipeline.

2. The continuous casting tundish nozzle protection pouring device according to claim 1, characterized in that: It also includes hooks (5), which are respectively set on the horizontal end of the air inlet pipe and the fixed rod, for hanging on the reserved protrusion.

3. The continuous casting tundish nozzle protection pouring device according to claim 1, characterized in that: The quick connector (9) includes a pipe connector (901), a turntable (902), a cam clamping plate (903), and a pressure rod (904). A guide groove is provided at the connection between the air inlet pipe of the semi-circular hollow tube and the quick connector (9). The turntable (902) is hinged on the pipe connector (901). The turntable (902) is used in conjunction with the guide groove. A groove is provided on the outer circumference of the end of the air inlet pipe away from the guide groove. The cam clamping plate (903) is coaxially provided on the turntable (902). The cam clamping plate (903) is used in conjunction with the groove. The pressure rod (904) is connected to the outer circumference of the turntable (902).

4. The continuous casting tundish nozzle protection pouring device according to claim 1, characterized in that: It also includes a gas regulating valve (8), which is installed on the inlet pipe of the semi-circular hollow tube to regulate the gas flow rate.

5. The continuous casting tundish nozzle protection pouring device according to claim 1, characterized in that: A sealing ring is provided at the connection end of the air inlet pipe of the semi-circular hollow tube and the quick connector (9).

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