A device for preventing immersion-type nozzle nodule formation using an external electric field

Abstract

This utility model discloses an external electric field anti-nozzle device for immersion-type casting nozzles. The device has a terminal block connected to the casting nozzle; the terminal block includes a base and a platform; the base is embedded in the casting nozzle and is connected to the nozzle via conductive mortar; the platform is connected to the head of a connecting handle via a self-locking structure; the platform and the connecting handle are tightly connected via the self-locking structure, and the tail of the connecting handle is connected to a power source in a movable operating platform via a wire; the wire consists of copper wire and a heat-resistant gas-conducting pipe; a small vacuum pump and a fan are built into the movable operating platform; the fan is located on the upper back of the housing; the power source of the movable operating platform also has a high-temperature resistant insulated wire connected to a negative electrode rod via a clamp; the negative electrode rod is inserted into the tundish. This utility model provides conditions for the widespread application of external electric field anti-nozzle technology in the field, is easy to operate, can significantly improve the anti-nozzle capability of casting nozzles, improve continuous casting efficiency, and contribute to the development of high-quality steel in my country.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical continuous casting technology, specifically relating to a device for preventing immersion-type nozzle nodule formation using an external electric field. Background Technology

[0002] As a pillar industry of the national economy, the steel industry has always been a core component of China's industrial system, playing an irreplaceable role in promoting scientific and technological progress and contributing to national rejuvenation and prosperity. The level of continuous casting technology directly determines the production efficiency and core performance of steel products.

[0003] Submerged entry nozzles, as an important functional refractory material in continuous casting, play a crucial role in connecting the tundish and the crystallizer, and have important functions such as preventing secondary oxidation of molten steel and stabilizing the molten steel flow field. In the continuous casting process, inclusions are a key factor affecting the quality of cast billets, especially in the continuous casting of high-quality steel. Inclusions such as alumina, magnesium aluminum spinel, and rare earth composite oxides are prone to react with submerged entry nozzles, leading to problems such as nodule blockage in the nozzle inner hole and slag adhesion on the outer wall. These problems can range from reducing casting speed and disrupting the flow field, affecting the stability of continuous casting operations, to causing nodule detachment and slag entrapment, seriously damaging the quality of cast billets. In severe cases, they can cause complete blockage of the nozzle, forcing the continuous casting process to be interrupted. This problem has become a "bottleneck" problem restricting the improvement of the quality and efficiency of high-quality special steel production in my country, and urgently needs to be effectively solved.

[0004] As an effective measure to prevent immersion nozzle nodule formation, the core advantage of an external electric field lies in its ability to regulate the movement trajectory and interfacial behavior of inclusions in molten steel at the microscopic level through the directional action of the electric field force, thereby blocking the adhesion and growth of inclusions on the inner wall of the nozzle. However, there are no reports on how the external electric field anti-nodule technology is implemented, and it has not been widely promoted and applied, mainly due to the lack of an external electric field anti-nodule device suitable for all steel plants. Utility Model Content

[0005] The purpose of this invention is to propose a device for preventing immersion-type nozzle nodule formation using an external electric field, aiming to realize the application and promotion of the technology of preventing immersion-type nozzle nodule formation using an external electric field.

[0006] The purpose of this utility model is achieved by the following technical solution.

[0007] An external electric field-based device for preventing immersion-type nozzle nodule formation includes a terminal block connected to the nozzle. The terminal block comprises a base and a platform. The base is embedded within the nozzle and bonded to it via conductive mortar, increasing the conductive area. The platform is connected to the head of a wiring handle via a self-locking structure. The platform and the wiring handle are tightly connected via the self-locking structure. The tail of the wiring handle is connected to a power source within a movable operating platform via a wire. The wire consists of copper wire and a heat-resistant gas-conducting tube. The wire carries current, and the heat-resistant gas-conducting tube delivers gas generated by a vacuum pump to the end of the wire. The movable operating platform contains a small vacuum pump and a fan. The small vacuum pump continuously generates gas to cool the end of the wire, preventing overheating and oxidation that could interrupt power supply. The fan is located at the top back of the housing and dissipates heat generated by the power source and vacuum pump outside the housing. The power source of the movable operating platform also has a high-temperature insulated wire connected to a negative electrode via a clamp. The negative electrode is inserted into an intermediate package.

[0008] The head of the terminal block has a protrusion, and a locking groove that mates with the protrusion is provided on the terminal handle. The protrusion and the locking groove together constitute the self-locking structure, which makes the terminal block surface in close contact with one side of the handle, increasing conductivity.

[0009] The conductive fire mud is composed of refractory materials and graphite. The refractory materials can be corundum, magnesia, silicon carbide, etc., accounting for 70-90% and graphite accounting for 10-30 wt%. The binder is aluminum dihydrogen phosphate, which has high conductivity during continuous casting.

[0010] The movable operating console consists of a movable platform and a housing; the power supply, small vacuum pump, and fan are located inside the housing; the movable operating console has an ergonomic tilt angle for easy operation and viewing of touchscreen information, and features one-click operation.

[0011] The wiring handle and terminal are made of high-temperature resistant metals, such as, but not limited to, 310S heat-resistant steel.

[0012] The base and platform are either integrated or separate terminals. The terminals are determined according to the type of water inlet. For quick-change thick-walled water inlets with a thickness >30mm, integrated terminals are used. For quick-change thin-walled water inlets and internal water inlets with a thickness <30mm, separate terminals are used. For thin-walled water inlets, terminals are installed on both sides of the water inlet, and the two terminals are connected and fixed with steel hoops.

[0013] The present invention proposes an external electric field-based device for preventing immersion-type nozzle nodule formation. Using the above-mentioned solution, it has the following beneficial effects: (1) Because the temperature of the continuous casting platform can reach 50℃ in summer; it is cooled by air cooling. Because there are many electrical appliances on site and it is a working condition for casting molten steel, water cooling cannot be used; the fan is set on the upper back of the box to exhaust the heat generated by the power supply and vacuum pump outside the box to prevent the power supply from overheating and shutting down. (2) The terminals, handles and negative clamps are all made of heat-resistant steel (not limited to 310S heat-resistant steel) to prevent them from softening due to high temperature radiation and to ensure the reliability of the connection between the water inlet and the power supply. (3) A small vacuum pump is installed in the power supply to continuously generate gas to cool the end of the wire and prevent the power supply from being interrupted due to oxidation caused by excessive wire temperature. (4) A self-made wire, which consists of copper wire and heat-resistant gas tube. The function of the wire is to transmit current, and the function of the gas tube is to deliver the gas generated by the vacuum to the end of the wire to prevent oxidation and breakage at the connection between the wire and the handle.

[0014] (5) Use conductive fire putty to fix the terminal block to the water outlet. The conductive fire putty serves to fix the terminal block at high temperature and has high conductivity to ensure the smooth implementation of the external electric field. In order to achieve the purpose of fixing and conducting electricity; (6) Prepare corresponding terminals according to the type of nozzle at the continuous casting site. If it is a quick-change thick-walled nozzle, install the terminal base and platform before the nozzle leaves the factory; if it is a quick-change thin-walled nozzle or an internal nozzle, only install the terminal base before the nozzle leaves the factory, and install the platform after the nozzle is installed before the continuous casting begins. The interface between the terminal and the nozzle is sealed with an anti-oxidation coating to prevent oxidation and ensure the long-term effective operation of the technology.

[0015] In summary, this utility model is applicable to the external electric field anti-caking technology for various types of nozzles, providing conditions for the field application and promotion of the external electric field anti-caking technology, and has important practical significance for continuous casting production. Attached Figure Description

[0016] Figure 1 Schematic diagram of the mobile platform structure: Figure 2 This is a schematic diagram of a split-type terminal block.

[0017] Figure 3 This is a schematic diagram of the structure of an integrated terminal block.

[0018] Figure 4 A schematic diagram of the connection structure between the thick-walled water inlet terminal and the water inlet; Figure 5 Schematic diagram of the terminal block for a thin-walled nozzle; Figure 6 A schematic diagram of the connection structure between the thin-walled nozzle terminal and the nozzle; Figure 7 Front view of the wiring handle; Figure 8 This is a top view of the wiring handle; Figure 9 A schematic diagram of fitting the wiring handle onto the terminal block; Figure 10 A schematic diagram of the structure for locking the wiring handle and the terminal block.

[0019] Figure 11 Main view for use of wiring handle and terminal block Figure 12 A schematic diagram of the field application of the electric field-assisted anti-immersion nozzle nodule device.

[0020] Figure 13 This is a schematic diagram of the fixture in this utility model.

[0021] In the diagram: 1. Power supply; 2. Small vacuum pump; 3. Fan; 4. Housing; 5. Adapter; 6. Pipe; 7. Wiring handle; 7-1. Locking groove; 8. Opening regulator; 9. Opening / closing rod; 10. Movable platform; 11. High-temperature resistant insulated wire; 12. Wire; 13. Clamp; 14. Terminal block; 14-1. Base; 14-2. Tabletop; 14-3. Protrusion; 15. Water nozzle; 16. Stopper rod; 17. Conductive fire mud; 18. Covering agent; 19. Molten steel; 20. Tundish; 21. Protective slag; 22. Crystallizer. Detailed Implementation

[0022] The present invention will be described in detail with reference to the accompanying drawings and specific embodiments: like Figure 12 As shown, an external electric field-based anti-immersion nozzle nodule device is provided, the device having a terminal 14 connected to the nozzle 15; combined with Figure 2 , Figure 3 The terminal block 14 includes a base 14-1 and a platform 14-2; the base 14-1 is embedded in the water inlet 15 and is connected and fitted to the water inlet 15 through conductive fire putty 17, increasing the conductive area; the platform 14-2 is connected to the head of the terminal handle 7 through a self-locking structure; the platform 14-2 and the terminal handle 7 are tightly connected through the self-locking structure, combining... Figure 1The tail of the wiring handle 7 is connected to the power supply 1 inside the movable operating table 10 via a wire 12. The wire 12 is composed of copper wire and a heat-resistant gas tube. The wire carries current, and the heat-resistant gas tube carries the gas generated by the vacuum pump to the end of the wire. The movable operating table 10 has a built-in small vacuum pump 2 and a fan 3. The small vacuum pump 2 continuously generates gas to cool the end of the wire and prevent the power supply from being interrupted due to oxidation caused by excessive wire temperature. The fan 3 is located on the upper back of the housing 5 and its function is to exhaust the heat generated by the power supply and vacuum pump outside the housing. The power supply 1 of the movable operating table 10 also has a high-temperature resistant insulated wire 11 connected to the negative electrode rod via a clamp 13. The negative electrode rod is inserted into the intermediate package.

[0023] Combination Figures 7-11 The head of the terminal 14 has a protrusion 14, and a locking groove 7-1 is provided on the terminal handle 7 to cooperate with the protrusion. The protrusion and the locking groove 7-1 together constitute the self-locking structure, so that the terminal platform and one side of the handle are in close contact, increasing conductivity.

[0024] The conductive fire mud 17 is composed of refractory materials and graphite. The refractory materials can be corundum, magnesia, silicon carbide, etc. The refractory materials account for 70-90%, the graphite accounts for 10-30 wt%, and the binder is aluminum dihydrogen phosphate. It has high conductivity during continuous casting.

[0025] The movable operating table 10 consists of two parts: a movable platform and a housing 4. The power supply 1, the small vacuum pump 2, and the fan 3 are located in the housing 4. The movable operating table has an ergonomic tilt angle, which is convenient for operation and viewing of touch screen information, and has a one-click operation function.

[0026] The wiring handle 7 and the terminal block 14 are both made of high-temperature resistant metals, such as, but not limited to, 310S heat-resistant steel.

[0027] The base 14-1 and the tabletop 14-2 form an integrated terminal block or a separate terminal block; the terminal block is determined according to the type of water inlet. For quick-change thick-walled water inlets with a thickness >30mm, an integrated terminal block is used, while for quick-change thin-walled water inlets and internal water inlets with a thickness <30mm, a separate terminal block is used. For thin-walled water inlets, terminal blocks are installed on both sides of the water inlet, and the two terminal blocks are connected and fixed with steel hoops.

[0028] A device and method for preventing nodule formation in immersion-type water nozzles using an external electric field are described below: Step 1: Prepare the corresponding terminal blocks according to the type of nozzle at the continuous casting site. If it is a quick-change thick-walled nozzle, install the terminal block base and platform before the nozzle leaves the factory; if it is a quick-change thin-walled nozzle or an internal nozzle, only install the terminal block base before the nozzle leaves the factory, and install the platform after the nozzle is installed before the continuous casting begins. Step 2: Before continuous casting begins, connect the movable operating table, wires and handles. After the tundish car is in place, connect the handles to the terminal block table and the clamps to the negative electrode bar. Step 3: Continuous casting begins. Turn on the power switch by controlling the movable platform, press the program button to output current, turn on the vacuum pump switch to output air, and turn on the fan switch to remove heat. Step 4: After continuous casting is completed, disconnect the power supply via the movable platform, turn off the vacuum pump and fan, and remove the handle and fixture. Example

[0029] When using thick-walled quick-change nozzles for casting, an integral terminal block is designed. The nozzle is processed before leaving the factory, and the terminal block is connected to the nozzle through conductive fire putty.

[0030] After the middle car is in place, connect the wiring handle to the terminal block surface through surface contact, and connect the clamp to the negative electrode rod.

[0031] At the start of continuous casting, the operation of the movable platform control device stably supplies current to the nozzle (applying an electric field, current 120A, frequency 20000Hz), and shuts off the device at the end of continuous casting.

[0032] By applying an electric field to the sprue using an external electric field anti-immersion sprue nodule device, compared to sprues without an applied electric field, the stopper rod rises to a lower height during casting, and the molten steel surface in the crystallizer fluctuates more smoothly. Observations of the sprues after the application show that nodule formation is reduced by more than 25% with the immersion sprue. Example

[0033] When using quick-change thin-walled nozzles and internal nozzles for casting, a split-type terminal block is designed. The nozzle is processed before leaving the factory. The thin-walled nozzle adopts a terminal block installation method on both sides of the nozzle. The terminal block is connected to the nozzle through conductive fire putty. The two terminal blocks of the thin-walled nozzle are connected with steel hoops.

[0034] After the middle car is in place, connect the wiring handle to the terminal block surface through surface contact, and connect the clamp to the negative electrode rod.

[0035] At the start of continuous casting, the operation of the movable platform control device stably supplies current to the nozzle (applying an electric field, current 120A, frequency 20000Hz), and shuts off the device at the end of continuous casting.

[0036] By applying an electric field to the sprue using an external electric field anti-immersion sprue nodule device, compared to sprues without an applied electric field, the stopper rod rises to a lower height during casting, and the molten steel surface in the crystallizer fluctuates more smoothly. Observations of the sprues after the application show that nodule formation is reduced by more than 25% with the immersion sprue.

[0037] The two cases described above are merely preferred embodiments of this utility model and are not intended to limit this utility model in any way. Although this utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit this utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A device for preventing immersion-type nozzle nodule formation using an external electric field, characterized in that: The device has a terminal block for connecting to a water inlet; the terminal block includes a base and a platform; the base is embedded in the water inlet and is connected to the water inlet via conductive mortar; the platform is connected to the head of a wiring handle via a self-locking structure; the platform and the wiring handle are tightly connected via the self-locking structure, and the tail of the wiring handle is connected to a power source inside a movable operating platform via a wire; the wire is composed of copper wire and a heat-resistant gas-conducting pipe; the movable operating platform has a built-in small vacuum pump for cooling the end of the wire and a fan for dissipating the heat generated by the power source and vacuum pump outside the housing; the fan is located on the upper back of the housing; the power source of the movable operating platform also has a high-temperature resistant insulated wire connected to a negative electrode via a clamp; the negative electrode is inserted into an intermediate package.

2. A device for preventing clogging of a submerged entry nozzle by an electric field as claimed in claim 1, characterized in that: The head of the terminal block has a protrusion, and a locking groove that mates with the protrusion is provided on the terminal handle. The protrusion and the locking groove together constitute the self-locking structure.

3. The device for preventing immersion-type nozzle nodule formation using an external electric field as described in claim 1, characterized in that: The conductive fire mud is composed of refractory materials and graphite.

4. The device for preventing immersion-type nozzle nodule formation using an external electric field as described in claim 1, characterized in that: The movable operating table consists of two parts: a movable platform and a housing; the power supply, a small vacuum pump, and a fan are located inside the housing; the movable operating table has an ergonomic tilt angle.

5. The device for preventing immersion-type nozzle nodule formation using an external electric field as described in claim 1, characterized in that: The base and platform are either integrated or separate terminals. The terminals are determined according to the type of water inlet. For quick-change thick-walled water inlets with a thickness >30mm, integrated terminals are used. For quick-change thin-walled water inlets and internal water inlets with a thickness <30mm, separate terminals are used. For thin-walled water inlets, terminals are installed on both sides of the water inlet, and the two terminals are connected and fixed with steel hoops.

Images