Thermal insulation device for submersed nozzle of continuous casting machine

Abstract

The utility model relates to a heat preservation device for a submersed nozzle of a continuous casting machine, and belongs to the technical field of continuous casting equipment in the metallurgical industry. According to the technical scheme, a plurality of U-shaped water gap storage grooves (10) are formed in the top face (13) of a box body, openings of the U-shaped grooves face a box door (6), the width of the U-shaped grooves is smaller than the diameter of the tops of water gaps (17) and larger than the diameter of the middles of the water gaps, and the height of the inner space of the box body is larger than the length of the water gaps; thermal insulation materials are arranged on the inner wall of the box body, and roller assemblies are arranged on the lower portion of the box body bottom face (4). The device has the beneficial effects that the temperature drop of the water gap in the storage process can be effectively reduced, and the cold steel formation phenomenon is avoided; the U-shaped structure of the box body movable door and the water gap storage groove facilitates taking and storage of the water gap; operation is convenient, and labor intensity of workers is reduced; the device can freely move in a workshop to meet the requirements of different stations; the heat preservation box body is closed, so that the scalding risk of staff can be reduced; the water gap storage groove and the box body are integrated, and water gaps are prevented from falling or colliding.

Description

Technical Field

[0001] This utility model relates to an immersion nozzle insulation device for continuous casting machines, belonging to the technical field of continuous casting equipment in the metallurgical industry. Background Technology

[0002] In the continuous casting workshop of a steelmaking plant, the submerged entry nozzle is an important component of the continuous casting equipment, its function being to guide molten steel from the tundish into the crystallizer. Because the submerged entry nozzle needs to be maintained at a high temperature during use, when replacing it, the old nozzle must usually be removed from the tundish, and a new nozzle, heated in a baking furnace, must be installed. Examples include Chinese patents CN202121978965X entitled "A Heat-Insulating Cover for Improving the Baking Temperature of a Split Submerged Entry Nozzle in Continuous Casting" and CN2016203260448 entitled "Baking Protective Cap for Submerged Entry Nozzles in Slab Continuous Casting." However, the following problems exist in actual operation: 1. Rapid temperature drop of the nozzle: New nozzles taken from the baking furnace (box) are exposed to a significant temperature difference between the ambient temperature (approximately 20-30℃) and the nozzle surface (approximately 1000℃ when removed). This causes the nozzle surface temperature to drop by 200-300℃ during installation, easily leading to the formation of cold steel on the nozzle surface, affecting the fluidity of the molten steel and the quality of the cast billet, and even causing production accidents. 2. High labor intensity: During centralized nozzle replacement, employees need to repeatedly remove the high-temperature nozzles from the baking furnace and transport them to the installation location. The operation is cumbersome and laborious, increasing the labor intensity of employees. 3. Safety hazards: The high temperature of the baked nozzles increases the risk of burns and other safety accidents for employees during handling. 4. Storage difficulties: The existing process lacks a dedicated nozzle storage device. New nozzles are easily affected by ambient temperature during installation, leading to a rapid temperature drop. Utility Model Content

[0003] The purpose of this invention is to provide a continuous casting machine submersible nozzle heat preservation device, which can prevent the temperature of the continuous casting submersible nozzle from dropping too quickly during the process of use, improve work efficiency, reduce labor intensity, reduce safety hazards during operation, effectively preserve heat, facilitate operation, and solve the above-mentioned problems existing in the background technology.

[0004] The technical solution of this utility model is:

[0005] A continuous casting machine immersion nozzle insulation device comprises a box body consisting of a bottom surface, a fixed vertical surface, a door, and a top surface. The three fixed vertical surfaces and the door are located between the bottom and top surfaces of the box body. The top surface of the box body has multiple nozzle storage slots, which are U-shaped slots with their openings facing the door. The width of the U-shaped slots is smaller than the diameter of the top of the nozzle but larger than the diameter of the middle of the nozzle. The height of the internal space of the box body is greater than the length of the nozzle. The inner wall of the box body is lined with insulation material, and a roller assembly is provided at the bottom of the box body.

[0006] The door is mounted on the box body via a hinge, and the door can be opened 180°.

[0007] A U-shaped iron plate is welded to the U-shaped edge of the water inlet storage tank to facilitate the stable placement of the water inlet.

[0008] The insulation material is a high-temperature resistant fiber felt.

[0009] The bottom surface of the box is equipped with a heat insulation pad.

[0010] The top surface of the box is equipped with a lifting point, and the side of the box is equipped with a push handle.

[0011] The insulation material is installed on at least the fixed facade of the box and the inner wall of the box door. The insulation material on the inner wall of the fixed facade of the box is fixed by vertical and horizontal flat steel bars for fixing the insulation material inside the box. The insulation material on the inner wall of the box door is fixed by vertical flat steel bars for fixing the insulation material inside the box door.

[0012] The roller assembly includes four rollers, four roller bearing seats, and four roller bearings. The four rollers are arranged at the four corners of the lower part of the bottom surface of the box. Each roller is connected to the roller bearing seat through a corresponding roller bearing. The roller bearing seat is fixedly connected to the bottom surface of the box through C-shaped steel.

[0013] Push this utility model near the nozzle baking furnace (box) and open the box door. Use a known and commonly used clamp to place the heated new nozzle onto the nozzle storage slot of this utility model, and close the box door. The box's insulation effectively reduces heat loss. When the nozzle needs to be replaced, push this utility model in front of the continuous casting machine. Open the box door and use the clamp to remove the nozzle. Because the nozzle still maintains a high temperature, it effectively avoids the phenomenon of cold steel forming. Install the removed new nozzle onto the continuous casting machine. After completing the replacement operation, close the box door and push this utility model back near the nozzle baking furnace (box) for later use.

[0014] The beneficial effects of this utility model are: it can effectively reduce the temperature drop of the sprue during storage and avoid the phenomenon of cold steel formation; the U-shaped structure of the movable door of the box and the sprue storage tank facilitates the use and storage of the sprue; it is easy to operate and reduces the labor intensity of employees; it can move freely in the workshop to adapt to the needs of different work positions; the insulated box has a closed design, which can reduce the risk of employees being scalded; the sprue storage tank is integrated with the box to prevent the sprue from falling or colliding. Attached Figure Description

[0015] Figure 1 This is a front view of the door in the open state according to an embodiment of this utility model;

[0016] Figure 2 This is a side view of the door in the closed state according to an embodiment of the present invention;

[0017] Figure 3 This is a top view of the door in the open state according to an embodiment of the present invention;

[0018] Figure 4 This is a front view of the tank door after the water inlet has been inserted, according to an embodiment of this utility model.

[0019] Figure 5 This is a perspective view of the embodiment of the present invention with the water inlet inserted and the tank door removed.

[0020] In the diagram: 1. Roller bearing seat; 2. Roller bearing; 3. Bottom surface of the box; 4. Fixed vertical surface of the box; 5. Box door; 6. Box door hinge; 7. Vertical fixing flat steel for the inner insulation material of the box; 8. Vertical fixing flat steel for the inner insulation material of the box door; 9. Sprue storage tank; 10. Lifting point; 11. Push handle; 12. Top surface of the box; 13. High temperature resistant fiber felt; 14. Horizontal fixing flat steel for the inner insulation material of the box; 15. Sprue; 17. U-shaped iron plate; 18. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] A continuous casting machine immersion nozzle insulation device comprises a box body consisting of a bottom surface 4, a fixed vertical surface 5, a door 6, and a top surface 13. The three fixed vertical surfaces 5 and the door 6 are located between the bottom surface 4 and the top surface 13. The top surface 13 is provided with multiple nozzle storage slots 10, each U-shaped, with the opening facing the door 6. The width of the U-shaped slot is less than the top diameter of the nozzle 17 but greater than the middle diameter of the nozzle 17. The height of the internal space of the box is greater than the length of the nozzle 17. The inner wall of the box is provided with insulation material, and a roller assembly is provided at the lower part of the bottom surface 4.

[0023] The door 6 is installed on the box body via the door hinge 7, and the door 6 can be opened 180°.

[0024] A U-shaped iron plate 18 is welded to the U-shaped edge of the water inlet storage tank 10 to facilitate the stable placement of the water inlet.

[0025] The insulation material is high-temperature resistant fiber felt 14.

[0026] The bottom surface 4 of the box is provided with a heat insulation pad.

[0027] The top surface 13 of the box is provided with a lifting point 11, and the side of the box is provided with a push handle 12.

[0028] The insulation material is at least installed on the fixed facade 5 of the box body and the inner wall of the box door 6. The insulation material on the inner wall of the fixed facade 5 of the box body is fixed by the vertical fixing flat steel 8 and the horizontal fixing flat steel 15 of the inner wall insulation material of the box body. The insulation material on the inner wall of the box door 6 is fixed by the vertical fixing flat steel 9 of the inner wall insulation material of the box door.

[0029] The roller assembly includes four rollers 1, four roller bearing seats 2, and four roller bearings 3. The four rollers are arranged at the four corners of the lower part of the bottom surface of the box. Each roller 1 is connected to the roller bearing seat 2 through the corresponding roller bearing 3. The roller bearing seat 2 is fixedly connected to the bottom surface 4 of the box through C-shaped steel.

[0030] In the embodiments,

[0031] The box body is a rectangular box made of 8mm thick iron plate welded together, with a bottom surface 4, three fixed vertical surfaces 5, and a top surface 13. The box body is 850mm high, 815mm long at the bottom, and 505mm wide. Four rollers are arranged at the four corners of the bottom of the box, 40mm from the bottom edge. The rollers 1 are fixed to the roller bearing seats 2 with bolts via roller bearings 3. The roller bearing seats 2 are welded to the bottom of the box body via C-shaped steel (5mm thick). The C-shaped steel and the bottom of the box body are welded intermittently with a weld spacing of 100mm to ensure a strong connection. A door 6 is installed at the side opening of the box body via a door hinge 7. Vertical fixing flat steel 9 and vertical fixing flat steel 16 for the internal insulation material are welded to the inside of the door 6. High-temperature resistant fiber felt 14 is filled in between. The high-temperature resistant fiber felt is 50mm thick and has a thermal conductivity of less than 0.05W / (m·K). The inner wall of the fixed facade 5 of the box is welded with insulation material, which is vertically fixed with flat steel 8 and horizontally fixed with flat steel 15. The interior is also filled with 50mm thick high-temperature resistant fiber felt.

[0032] A U-shaped groove is cut on the top surface 13 of the housing. A U-shaped iron plate 18, 65mm high and 10mm thick, is welded to the edge of the U-shaped groove. The opening of the U-shaped groove faces the door of the housing, forming a sprue storage tank 10. Three tanks are provided, each capable of holding two sprues 17. The three tanks can hold up to six sprues, meeting the centralized storage needs of a six-strand continuous casting machine. The inner diameter of the sprue storage tank is designed for immersion sprues; in this embodiment, it is 125mm wide. Lifting points 11 are located at both ends of the center line of the long side of the top surface of the housing. They are made of 10mm thick steel plate with a side length of 80mm and a center opening of 40mm diameter, facilitating the handling of this utility model using lifting equipment. A push handle 12 is welded between two roller bearing seats on one side of the housing. The push handle is made of steel pipe with a diameter of 30mm and a wall thickness of 3mm, and a length of 217mm, facilitating the pushing of this utility model.

[0033] Based on the changes in the billet length of the casting machine, the heat preservation device is pushed to the vicinity of the baking oven (box) in advance using pusher 12. During the pushing process, the roller 1 can easily move the device to the designated position. The roller has low rolling friction, which reduces pushing resistance. Open the box door 6 and rotate it around the door hinge 7, with a rotation angle of up to 180°. Use a clamp to accurately install the submersible nozzle onto the nozzle storage tank 10, ensuring that the nozzle is placed stably. Since the inner diameter of the nozzle storage tank matches the nozzle size and there is a heat insulation pad at the bottom of the box, heat loss can be effectively reduced. Close the box door 6. After closing, the gap between the box door and the box body is less than 5mm, ensuring the airtightness of the box body and further reducing heat dissipation. When it is necessary to replace the nozzle in front of the continuous casting machine, push the device to the front of the continuous casting machine using pusher 12. Open the box door 6, and the submersible nozzle in the nozzle storage tank 10 can be seen. Use clamps to remove the submersible nozzle. Because the nozzle maintains a relatively high temperature inside the chamber (200-300℃ higher than without insulation), it effectively prevents the formation of cold steel. Quickly install the removed nozzle onto the continuous casting machine. After completing the replacement operation, close chamber door 6 and push the insulation device back to the vicinity of the baking furnace (box) for later use.

Claims

1. A shroud for a continuous caster, characterized by: The box is composed of the bottom surface (4), the fixed vertical surface (5), the door (6) and the top surface (13). The three fixed vertical surfaces (5) and the door (6) are located between the bottom surface (4) and the top surface (13). The top surface (13) of the box is provided with multiple water outlet storage slots (10). The water outlet storage slots (10) are U-shaped slots with the openings facing the door (6). The width of the U-shaped slot is smaller than the top diameter of the water outlet (17) and larger than the middle diameter of the water outlet (17). The height of the internal space of the box is greater than the length of the water outlet (17). The inner wall of the box is provided with heat insulation material. The bottom surface (4) of the box is provided with a roller assembly.

2. A device for protecting a submerged nozzle of a continuous casting machine according to claim 1, characterized in that: The door (6) is installed on the box body via a door hinge (7), and the door (6) can be opened 180°.

3. A device for protecting a submerged nozzle of a continuous casting machine according to claim 1 or 2, characterized in that: A U-shaped iron plate (18) is welded to the U-shaped edge of the water inlet storage tank (10).

4. A device for protecting a submerged nozzle of a continuous casting machine according to claim 1 or 2, characterized in that: The insulation material is high-temperature resistant fiber felt (14); the bottom surface (4) of the box is provided with a heat insulation pad; the top surface (13) of the box is provided with a hanging point (11), and the side of the box is provided with a push handle (12).

5. A device for protecting a submerged nozzle of a continuous casting machine according to claim 1 or 2, characterized in that: The insulation material is at least installed on the fixed facade (5) of the box body and the inner wall of the box door (6). The insulation material on the inner wall of the fixed facade (5) of the box body is fixed by vertical fixing flat steel (8) and horizontal fixing flat steel (15) of the inner wall of the box body insulation material. The insulation material on the inner wall of the box door (6) is fixed by vertical fixing flat steel (9) of the inner wall of the box door insulation material.

6. A device for protecting a submerged nozzle of a continuous casting machine according to claim 1 or 2, characterized in that: The roller assembly includes four rollers (1), four roller bearing seats (2) and four roller bearings (3). The four rollers are arranged at the four corners of the bottom of the box. Each roller (1) is connected to the roller bearing seat (2) through the corresponding roller bearing (3). The roller bearing seat (2) is fixedly connected to the bottom surface (4) of the box through C-shaped steel.

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