Flow blocking device for continuous casting casting

Abstract

The utility model discloses a flow blocking device for continuous casting pouring, which belongs to the technical field of slab continuous casting and comprises a flow blocking plate, the flow blocking plate is of a hollow structure, a cooling flow channel is arranged in the flow blocking plate, a water inlet pipe is arranged on the flow blocking plate at the water inlet end of the cooling flow channel, and a water return pipe is arranged on the flow blocking plate at the water outlet end of the cooling flow channel. The water inlet pipe and the water return pipe are communicated with an external cooling medium source, and the water inlet pipe, the cooling flow channel and the water return pipe form a cooling loop; a thermocouple is arranged on the flow baffle, the temperature measuring end of the thermocouple is arranged on the injection surface of the flow baffle, and the thermocouple is in electric signal connection with external temperature display equipment. According to the utility model, the working temperature under the thermal radiation of high-temperature molten steel can be effectively controlled, the service life of the device is greatly prolonged, the replacement frequency is reduced, the real-time monitoring of the surface temperature is realized, and the stability and the safety in the continuous casting process are improved.

Description

Technical Field

[0001] This utility model belongs to the field of slab continuous casting technology, and particularly relates to a flow-blocking device for continuous casting start-up. Background Technology

[0002] During the continuous casting slab production process, when the first batch of molten steel is injected into the crystallizer, the high-temperature liquid metal impacts the narrow-face copper plate of the crystallizer at a high flow rate through the immersion nozzle, which can easily cause molten steel splashing and turbulent disturbance. This unsteady flow behavior leads to three process risks: First, the splashed molten steel adheres to the surface of the narrow-face copper plate, forming cold steel slag, which disrupts the uniformity of heat conduction in the copper plate; second, the accumulation of cold steel may cause local solidification shrinkage stress, increasing the risk of hot cracking in the copper plate; third, the prolonged direct contact between the unsolidified molten steel and the copper plate exacerbates copper plate corrosion and affects the surface quality of the cast slab.

[0003] Traditional processes use disposable wooden baffles for physical isolation, which can improve the impact effect of molten steel in the short term, but has inherent defects: wood is prone to carbonization and peeling when heated, which not only contaminates the composition of molten steel, but also wastes resources due to its single-use nature; its planar structure design is difficult to adapt to crystallizers with different cross-sectional dimensions, and the installation and positioning rely on manual experience, making it difficult to guarantee accuracy; more importantly, the characteristic of wood to fail rapidly at high temperatures causes the protective effectiveness to decrease exponentially, making it difficult to meet the requirements of continuous casting processes. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a flow-blocking device for continuous casting, which can effectively control the working temperature under the thermal radiation of high-temperature molten steel, significantly extend its service life, reduce the replacement frequency, and realize real-time monitoring of surface temperature, thereby improving the stability and safety of the continuous casting process.

[0005] This utility model is implemented as follows: a flow-blocking device for continuous casting includes a flow-blocking plate, which is a hollow structure. A cooling channel is provided inside the flow-blocking plate. An inlet pipe is provided on the flow-blocking plate at the water inlet end of the cooling channel, and a return pipe is provided on the flow-blocking plate at the water outlet end of the cooling channel. The inlet pipe and the return pipe are connected to an external cooling medium source, and the inlet pipe, the cooling channel, and the return pipe form a cooling circuit.

[0006] A thermocouple is provided on the baffle plate, and the temperature measuring end of the thermocouple is located on the injection surface of the baffle plate. The thermocouple is electrically connected to an external temperature display device.

[0007] Furthermore, the inner cavity of the baffle plate is staggered with multiple cooling baffles, forming cooling channels between them. The staggered arrangement of these cooling baffles creates a tortuous cooling channel, allowing the cooling medium to fully contact the inner wall of the baffle plate as it flows through. This prolongs the residence time of the cooling medium within the baffle plate, increases the heat exchange area and efficiency, and achieves a more uniform and efficient cooling effect. This effectively avoids problems such as localized overheating or uneven temperature stress caused by uneven cooling. During continuous casting, the molten steel temperature is extremely high, and the baffle plate needs to withstand enormous thermal shock. The optimized cooling system can more quickly conduct and dissipate heat from the baffle surface, keeping the baffle surface temperature consistently low. This further reduces the likelihood of molten steel adhering to and solidifying on the baffle surface, significantly improving the performance of preventing cold steel from sticking to the baffle and better solving the problem of cold steel sticking to the narrow face of the crystallizer caused by traditional wooden baffles. The staggered arrangement of the cooling baffles not only divides the cooling channels but also enhances the structural strength and rigidity of the baffle to a certain extent, enabling it to maintain better stability and resistance to deformation in the high-temperature, high-pressure continuous casting environment. This extends the service life of the baffle and reduces the risk of baffle deformation affecting the flow control effect or causing other continuous casting quality problems.

[0008] Furthermore, the baffle includes a main body and side plates disposed on both sides of the main body.

[0009] Furthermore, the side plate is a rectangular plate, and the side plate forms an angle of 110° to 160° with the main body. This increases the area of ​​the baffle plate at the dead corner of the crystallizer, thus further reducing the probability of cold steel accumulating at the corner of the baffle plate.

[0010] Furthermore, the side plate is an arc-shaped plate. The arc-shaped plate has a smooth surface, making it less prone to catching cold steel.

[0011] Furthermore, the baffle plate is divided into upper, middle, and lower temperature measuring zones along the direction of molten steel injection, with multiple thermocouples evenly distributed within each zone. This enables comprehensive, multi-point monitoring of the temperature in different areas of the baffle plate. Compared to a single temperature measuring point, this zoned, multi-point temperature measurement method can more accurately obtain temperature information from various parts of the baffle plate, providing operators with more comprehensive and detailed temperature data. This facilitates real-time monitoring of temperature changes in the baffle plate during continuous casting, allowing for more targeted adjustments to the flow rate, velocity, or temperature of the cooling medium. This achieves precise cooling control of various parts of the baffle plate, effectively preventing material performance degradation and structural damage caused by localized overheating. It also ensures the baffle plate maintains better working condition in high-temperature environments, reducing deformation and cracking caused by uneven temperature stress, thereby extending the service life of the baffle plate and reducing production costs.

[0012] Furthermore, the axis of the thermocouple's protective sheath is perpendicular to the injection surface of the baffle. This design allows the thermocouple's measuring end to contact and measure the temperature of the injection surface more directly and accurately, improving the accuracy and reliability of temperature measurement.

[0013] Furthermore, the baffle is made of steel sheet. The steel sheet allows for the reuse of the device.

[0014] The advantages and technical effects of this utility model are as follows: By adopting the above-mentioned technical solution, the hollow cooling channel structure combined with the circulating water system effectively controls the working temperature under the thermal radiation of high-temperature molten steel through continuous and stable cooling medium flow. This ensures stable operating temperature of the device body, allowing for reuse and significantly extending its service life, reducing replacement frequency, and guaranteeing long-term stable flow-blocking function. Thermocouples enable real-time surface temperature monitoring, allowing operators to intuitively and in real-time monitor the temperature of the baffle plate's injection surface during continuous casting. If an abnormal temperature rise occurs, operators can quickly take corresponding measures, such as adjusting the flow rate and velocity of the cooling medium, effectively preventing damage to the baffle plate due to excessive temperature or affecting its flow-blocking effect. This further improves the stability and safety of the continuous casting process, avoiding risks such as production interruptions or product quality degradation caused by temperature issues. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure provided in one embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the inner cavity of the baffle provided in this embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the overall structure provided in another embodiment of the present utility model.

[0018] In the diagram: 1. Baffle plate; 1-1. Main body; 1-2. Side plate; 2. Inlet pipe; 3. Return pipe; 4. Thermocouple; 5. Cooling baffle; 6. Cooling channel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0020] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0021] like Figure 1 and Figure 2 As shown, this application provides a flow-blocking device for continuous casting, including a flow-blocking plate 1. The flow-blocking plate 1 has a hollow structure and a cooling channel 6 is provided inside the flow-blocking plate 1. A water inlet pipe 2 is provided on the flow-blocking plate 1 at the water inlet end of the cooling channel 6, and a water return pipe 3 is provided on the flow-blocking plate 1 at the water outlet end of the cooling channel 6. The water inlet pipe 2 and the water return pipe 3 are connected to an external cooling medium source. The water inlet pipe 2, the cooling channel 6 and the water return pipe 3 form a cooling circuit. Specifically, the external cooling medium source is equipped with a delivery pump and a flow rate regulating valve on the delivery pipeline, which can perform medium circulation and flow rate regulation of the cooling medium.

[0022] A thermocouple 4 is installed on the baffle plate 1, with its temperature-sensing end positioned on the injection surface of the baffle plate 1. The thermocouple 4 is electrically connected to an external temperature display device. Specifically, the thermocouple's cold junction is connected to one end of a compensating wire. This connection is typically achieved through welding or bolting to ensure a secure and reliable connection. During connection, it is crucial that the polarity of the compensating wire matches that of the thermocouple; the positive terminal of the compensating wire connects to the positive terminal of the thermocouple, and the negative terminal connects to the negative terminal. The other end of the compensating wire is connected to the input terminal of the temperature measuring instrument, again ensuring correct polarity connection to the corresponding terminal on the instrument. Temperature measuring instruments include, but are not limited to, electronic potentiometers, temperature indicating controllers, and digital temperature display instruments, used to receive and process thermoelectric potential signals and display temperature values. Internally, they typically contain amplification circuits, analog-to-digital conversion circuits, and linearization processing circuits.

[0023] Specifically, the inner cavity of the baffle plate 1 is provided with multiple cooling baffles 5 arranged in an alternating pattern, forming cooling channels 6 between the multiple cooling baffles 5. The alternating arrangement of multiple cooling baffles 5 in the inner cavity of the baffle plate 1 forms a tortuous cooling channel 6, which allows the cooling medium to fully contact the inner wall of the baffle plate 1 when flowing through it. This prolongs the residence time of the cooling medium in the baffle plate 1, increases the heat exchange area and heat exchange efficiency, thereby achieving a more uniform and efficient cooling effect. This effectively avoids problems such as local overheating or uneven temperature stress in the baffle plate 1 caused by uneven cooling. During the continuous casting process, the temperature of the molten steel is extremely high, and the baffle plate 1 needs to withstand huge thermal shocks. The optimized cooling system can more quickly conduct and dissipate heat from the surface of the baffle plate 1, keeping the surface temperature of the baffle plate 1 at a low level. This further reduces the possibility of molten steel adhering to and solidifying on the surface of the baffle plate 1, significantly improving the performance of preventing cold steel from sticking to the surface. It also better solves the problem of cold steel sticking to the narrow face of the crystallizer caused by traditional wooden baffles. The staggered arrangement of the cooling baffles 5 not only divides the cooling channels 6, but also enhances the structural strength and rigidity of the baffle plate 1 to a certain extent, enabling it to maintain better stability and resistance to deformation in the high-temperature and high-pressure continuous casting environment. This extends the service life of the baffle plate 1 and reduces the risk of affecting the flow blocking effect or causing other continuous casting quality problems due to the deformation of the baffle plate 1.

[0024] Furthermore, the baffle 1 includes a main body 1-1 and side plates 1-2 disposed on both sides of the main body 1-1.

[0025] In one embodiment of this application, such as Figure 1 As shown, the side plate 1-2 is a rectangular plate, and the side plate 1-2 forms an angle of 110° to 160° with the main body 1-1. This increases the area of ​​the baffle plate 1 at the dead corner of the crystallizer, thus further reducing the probability of cold steel accumulating at the corner of the baffle plate 1.

[0026] In yet another embodiment of this application, such as Figure 3 As shown, the side plate 1-2 is an arc-shaped plate. The arc-shaped plate has a smooth surface, making it less likely for cold steel to get stuck.

[0027] Furthermore, the baffle plate 1 is divided into an upper temperature measuring zone, a middle temperature measuring zone, and a lower temperature measuring zone along the direction of molten steel injection. Multiple thermocouples 4 are evenly distributed within each temperature measuring zone. Specifically, both the main body 1-1 and the side plate 1-2 of the baffle plate 1 are divided into an upper temperature measuring zone, a middle temperature measuring zone, and a lower temperature measuring zone. Each temperature measuring zone of the main body 1-1 and the side plate 1-2 is equipped with a thermocouple 4, enabling comprehensive, multi-point monitoring of the temperature in different areas of the baffle plate 1. Compared to setting a single temperature measurement point, this zoned, multi-point temperature measurement method can more accurately obtain temperature information for various parts of the baffle plate 1, providing operators with more comprehensive and detailed temperature data. This facilitates real-time monitoring of the temperature changes of the baffle plate 1 during continuous casting, allowing for more targeted adjustments to the flow rate, velocity, or temperature of the cooling medium. This enables precise cooling control of various parts of the baffle plate 1, effectively preventing material performance degradation and structural damage caused by localized overheating. It also ensures the baffle plate 1 maintains better working condition in high-temperature environments, reducing deformation and cracking caused by uneven temperature stress, thereby extending the service life of the baffle plate 1 and reducing production costs.

[0028] Furthermore, the axis of the protective sheath of the thermocouple 4 is perpendicular to the injection surface of the baffle 1. This design allows the temperature measuring end of the thermocouple 4 to contact and measure the temperature of the injection surface more directly and accurately, improving the accuracy and reliability of temperature measurement.

[0029] Furthermore, the baffle plate 1 is made of steel sheet. The steel sheet allows for the reuse of the device.

[0030] By adopting the above technical solution, the hollow cooling channel 6 structure, combined with the circulating water system, effectively controls the working temperature under the thermal radiation of high-temperature molten steel through continuous and stable cooling medium flow. This ensures stable operating temperature of the device body, allowing for reuse and significantly extending its service life, reducing replacement frequency, and guaranteeing long-term stable flow-blocking function. Thermocouple 4 enables real-time surface temperature monitoring, allowing operators to intuitively and in real-time monitor the temperature of the injection surface of the baffle 1 during continuous casting. If an abnormal temperature rise occurs, operators can quickly take corresponding measures, such as adjusting the flow rate and velocity of the cooling medium, effectively preventing damage to the baffle 1 due to excessive temperature or affecting its flow-blocking effect. This further improves the stability and safety of the continuous casting process, avoiding risks such as production interruption or product quality degradation caused by temperature issues.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flow-blocking device for continuous casting start-up, characterized in that, Includes a baffle plate, which has a hollow structure and a cooling channel inside. A water inlet pipe is provided on the baffle plate at the water inlet end of the cooling channel, and a water return pipe is provided on the baffle plate at the water outlet end of the cooling channel. The water inlet pipe and the water return pipe are connected to an external cooling medium source, and the water inlet pipe, the cooling channel and the water return pipe form a cooling circuit. A thermocouple is provided on the baffle plate, and the temperature measuring end of the thermocouple is located on the injection surface of the baffle plate. The thermocouple is electrically connected to an external temperature display device.

2. The flow-blocking device for continuous casting opening according to claim 1, characterized in that, The inner cavity of the baffle plate is provided with multiple cooling baffles arranged in an alternating manner, and cooling channels are formed between the multiple cooling baffles.

3. The flow-blocking device for continuous casting opening according to claim 1 or 2, characterized in that, The baffle includes a main body and side plates disposed on both sides of the main body.

4. The flow-blocking device for continuous casting start-up according to claim 3, characterized in that, The side plate is a rectangular plate, and the side plate forms an angle of 110° to 160° with the main body.

5. The flow-blocking device for continuous casting start-up according to claim 3, characterized in that, The side plate is an arc-shaped plate.

6. The flow-blocking device for continuous casting start-up according to claim 1, characterized in that, The baffle plate is divided into an upper temperature measuring zone, a middle temperature measuring zone, and a lower temperature measuring zone along the direction of molten steel injection. Multiple thermocouples are distributed at equal intervals in each temperature measuring zone.

7. The flow-blocking device for continuous casting start-up according to claim 1, characterized in that, The axis of the protective sheath of the thermocouple is perpendicular to the injection surface of the baffle plate.

8. The flow-blocking device for continuous casting start-up according to claim 1, characterized in that, The baffle is made of steel sheet.

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