An automatic nozzle alignment system and method for tundish baking in continuous casting

Abstract

This invention discloses an automatic nozzle alignment system and method for tundish baking in continuous casting. The system includes a tundish, a moving alignment mechanism, and a baking furnace. The tundish is mounted on the moving alignment mechanism, and the baking furnace is positioned below the tundish. A nozzle is located at the bottom of the tundish, with its lower end inserted into the baking furnace. A distance measuring device is mounted on the moving alignment mechanism. The moving alignment mechanism can move the tundish and nozzle back and forth relative to the baking furnace in both the lateral and longitudinal directions. The distance measuring device is used to measure whether the nozzle and the baking furnace are aligned. This invention features a simple overall system structure, convenient installation, low cost, and strong applicability; it can automatically determine whether the baking furnace is aligned.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, specifically to an automatic nozzle alignment system and method for baking tundishes in continuous casting. Background Technology

[0002] The tundish nozzle is the channel through which molten steel flows from the tundish to the crystallizer. It protects the molten steel from contact with outside air, preventing oxidation, and works in conjunction with the stopper rod to control the flow rate. It is one of the core pieces of equipment for efficient and high-quality continuous casting production. Before use, the nozzle must undergo high-temperature baking. The uniformity and consistency of this baking are closely related to the fluctuation range of the liquid surface and the incidence of product quality defects such as slag entrapment during casting. Therefore, ensuring the quality of nozzle baking is crucial. Currently, most tundish nozzles use a bottom-extraction baking method, which uses the suction of a blower to draw high-temperature gas from the baking chamber above the tundish downwards, using the calorific value of the gas to heat the nozzle. Simulation analysis and experiments have revealed that the alignment of the nozzle with the surrounding sealing cover has a significant impact on the baking effect. However, currently, the alignment of the nozzle and the sealing cover is done manually by visual inspection, resulting in significant deviations and causing numerous production interruptions due to poor baking results. Therefore, there is an urgent need to develop an automatic nozzle alignment system for baking to achieve automatic alignment between the nozzle and the sealing cover and improve alignment accuracy. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic aligning system and method for tundish baking in continuous casting, which addresses the above-mentioned defects in the prior art. The system has a simple structure, is easy to install, is inexpensive, and has strong applicability; it can automatically determine whether the baking furnace position is aligned.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] An automatic nozzle alignment system for baking tundish in continuous casting includes a tundish, a moving alignment mechanism, and a baking furnace. The tundish is mounted on the moving alignment mechanism, and the baking furnace is located below the tundish. A nozzle is located at the bottom of the tundish, and the lower end of the nozzle is inserted into the baking furnace. A rangefinder is mounted on the moving alignment mechanism. The moving alignment mechanism can drive the tundish and nozzle to move back and forth relative to the baking furnace in the horizontal and vertical directions.

[0006] According to the above technical solution, the mobile alignment mechanism includes a mobile trolley and a middle bag frame. The middle bag is set on the mobile trolley, and the mobile trolley is set on the middle bag frame. The bottom of the middle bag frame is equipped with wheels. The mobile trolley can drive the middle bag to move back and forth on the middle bag frame in the lateral direction, and the middle bag frame can move back and forth in the longitudinal direction through the wheels.

[0007] According to the above technical solution, the intermediate baggage frame includes an upper frame and a lower frame. A trolley is set on the upper frame and can drive the intermediate baggage to move back and forth laterally on the upper frame. The upper frame is set on the lower frame. A lifting system is provided between the upper and lower frames. Wheels are set at the bottom of the lower frame and can move back and forth longitudinally via the wheels.

[0008] According to the above technical solution, there are pulleys between the bottom of the mobile trolley and the upper frame of the medium-sized baggage car. A transverse drive system is provided on the upper frame of the medium-sized baggage car. The transverse drive system is connected to the mobile trolley. The transverse drive system drives the mobile trolley to move back and forth on the upper frame of the medium-sized baggage car through the pulleys. A sensor is provided on the transverse drive system.

[0009] According to the above technical solution, the wheel axle is fixed to the lower frame of the middle car by the mounting plate, the wheel is connected to the drive system, and the drive system is equipped with an encoder.

[0010] The lower frame of the medium-sized car has longitudinally arranged rails, and the wheels are set on the rails. The lower frame of the medium-sized car moves back and forth along the rails by means of the wheels.

[0011] According to the above technical solution, the lower end of the sprue passes through the top hole of the baking oven and is inserted into the baking oven. The bottom hole of the baking oven is connected to a downward suction pipe, the downward suction pipe is connected to a fan, and the fan is connected to a smoke exhaust pipe. The top hole and the bottom hole of the baking oven are arranged on the same axis.

[0012] According to the above technical solution, a sealing device is provided between the top hole and the water inlet of the baking oven.

[0013] According to the above technical solution, there are two rangefinders, which are symmetrically arranged on both sides of the baking oven and arranged sequentially along the width of the intermediate bun. The rangefinders are fixedly connected to the baking oven through a cylindrical bracket.

[0014] According to the above technical solution, two sprue nozzles are arranged sequentially along the length of the bottom of the tundish. A distance sensor is installed on each side of the line connecting the center lines of the two sprue nozzles to determine the alignment of the sprue nozzles with the baking oven along the length of the tundish.

[0015] Each sprue is equipped with a baking oven below it. Along the length of the tundish, a column is designed on each side of the extended center line of the two baking ovens. Each column is equipped with a displacement sensor. After the sensors are installed, the distance between the left sensor and the left baking oven is c, and the distance between the right sensor and the right baking oven is d. The real-time position and centering of the baking oven can be measured by the readings of the sensors.

[0016] An automatic alignment method using the above-described automatic aligning system for tundish baking in continuous casting: two tundish nozzles are arranged sequentially along the length of the bottom of the tundish, and a distance sensor is installed on each side of the line connecting the center lines of the two nozzles to determine the alignment of the nozzles with the baking furnace along the length of the tundish.

[0017] Below each sprue is a baking oven. Along the length of the tundish, on both sides of the extended center line of the two baking ovens, there is a column. Each column is equipped with a displacement sensor.

[0018] The automatic centering method includes the following steps:

[0019] Step 1: Under normal operating conditions, the lifting system extends, the upper frame of the middle tray is at its highest position, and the displacement sensors are energized and continuously measure the distance to the nearest baking oven. The real-time measurement value of the left displacement sensor is recorded as x1, and the real-time measurement value of the right displacement sensor is recorded as x2. If |x1-c|≥e, where c is the distance between the left displacement sensor and the left baking oven, and e is the system's allowable deviation, then the message "The left baking oven position has shifted, please restore" is displayed. If |x2-d|≥e, where d is the distance between the right displacement sensor and the right baking oven, and e is the system's allowable deviation, then the message "The right baking oven position has shifted, please restore" is displayed. If |x1-c|≥e and |x2-d|≥e, then the message "The positions of both left and right baking ovens have shifted, please restore" is displayed. The alarm will remain unless the "Fault Recovery" button is clicked after the baking oven positions are restored. The alarm will continue until the fault is recovered.

[0020] Step 2: After the intermediate bag is placed on the traverse trolley, the lowest edge of the sprue is higher than the upper plane of the baking oven and the measuring line of the distance sensor. The distance sensor and distance measuring instrument are powered on and started. The real-time measurement values ​​of the two distance measuring instruments on the left baking oven are recorded as a1 and b1, respectively; the real-time measurement values ​​of the two distance measuring instruments on the right baking oven are recorded as a2 and b2, respectively. If |a1-a2|≥f, where f is the system's allowable deviation, the system displays "The intermediate bag tilt is too large, and it needs to be dropped again," and the traverse drive system is locked. The traverse drive system is unlocked when |a1-a2|<f.

[0021] Step 3: Record the measured values ​​of the left and right distance sensors as L1 and L2 respectively. At this time, both L1 and L2 are s, where s is the distance between the two distance sensors. Start the lifting system to retract until L1 < s / 2 and L2 < s / 2, then the lifting system stops moving.

[0022] Step 4: If L1 > L2, the drive system starts and drives the upper frame of the middle baggage car to move to the left along the track through the wheels until L1 = L2, at which point the drive system stops and proceeds to step 5.

[0023] If L1 < L2, the drive system starts and drives the upper frame of the middle baggage car to move to the right along the track through the wheels until L1 = L2, the drive system stops and proceeds to step 5;

[0024] Step 5: If a1 > b1, move (a1 - b1) / 2 along the width direction of the intermediate bag towards the lateral drive system via the lateral drive system, and record its displacement value via the sensor until a1 = b1; if a1 > a2 at this time, move (a1 - a2) / 2 in the opposite direction of the lateral drive system along the width direction of the intermediate bag via the lateral drive device; otherwise, move (a2 - a1) / 2 along the width direction of the intermediate bag towards the lateral drive system via the lateral drive device.

[0025] If a1 < b1, the lateral drive system moves (b1 - a1) / 2 in the opposite direction of the lateral drive system along the width of the tundish, and the displacement value is recorded by the sensor until a1 = b1. If a1 > a2, the lateral drive system moves (a1 - a2) / 2 in the opposite direction of the lateral drive system along the width of the tundish. Otherwise, the lateral drive system moves (a2 - a1) / 2 in the direction of the lateral drive system along the width of the tundish.

[0026] Step 6: Start the lifting system to retract it, and move the upper frame of the intermediate ladle car, the intermediate ladle and the sprue downwards until 2 / 3 of the sprue is inserted into the baking oven. Stop the lifting system and use the sealing device to seal the gap between the sprue and the baking oven. After sealing is completed;

[0027] Step 7: Start the fan so that the heat generated by the baking oven above the intermediate ladle passes through the sprue, baking oven, lower exhaust pipe and flue pipe in sequence to bake the sprue. When the baking temperature of the sprue reaches the preset temperature, turn off the fan, the distance sensor and distance meter lose power, and the system ends.

[0028] The present invention has the following beneficial effects:

[0029] 1. The overall system has a simple structure, is easy to install, is inexpensive, and has strong applicability; through logical judgment of the measured data from the rangefinder, it can automatically determine whether the baking oven is centered.

[0030] 2. The centering accuracy of the sprue nozzle along the length of the tundish can be automatically determined by the distance sensors on both sides of the baking oven. Simultaneously, the drive system, which rotates the wheels in both directions, enables automatic centering of the sprue nozzle along the length of the tundish. The baking oven has a hollow structure and includes a lower exhaust pipe and a smoke exhaust pipe. The sprue nozzle is baked using the heat energy from the tundish through a fan, achieving energy-efficient baking. The fan speed can be adjusted to control the amount of air drawn from the sprue nozzle, thereby controlling the baking curve and heating rate of sprue nozzle 2. By installing displacement sensors on the baking oven, the centering accuracy of the sprue nozzle along the width of the tundish is automatically determined. The lateral drive system moves the lateral trolley left and right, achieving self-centering of the sprue nozzle along the width of the tundish. The tundish trolley is designed with a split upper and lower structure, and the height of the sprue nozzle can be adjusted through a lifting system. Attached Figure Description

[0031] Figure 1 This is a front view of the automatic nozzle alignment system for continuous casting tundish baking in an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 The left view;

[0033] Figure 3 This is a cross-sectional view of the baking oven in an embodiment of the present invention;

[0034] In the diagram, 1-intermediate tundish, 2-sprue, 3-rangefinder, 4-moving trolley, 5-pulley, 6-cylindrical support, 7-lower frame of the intermediate tundish trolley, 8-mounting plate, 9-drive system, 10-encoder, 11-lower extraction pipe, 12-exhaust pipe, 13-fan, 14-wheel, 15-track, 16-baking oven, 17-column, 18-displacement sensor, 19-sealing device, 20-upper frame of the intermediate tundish trolley, 21-lateral drive system, 22-sensor, 23-lifting system, 24-rangefinder sensor. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Reference Figures 1-3As shown in Embodiment 1 of the present invention, an automatic nozzle alignment system for continuous casting tundish baking includes a tundish 1, a moving alignment mechanism, and a baking furnace 16. The tundish 1 is mounted on the moving alignment mechanism, and the baking furnace 16 is located below the tundish 1. A nozzle 2 is provided at the bottom of the tundish 1, and the lower end of the nozzle 2 is inserted into the baking furnace 16. A distance measuring instrument 3 is mounted on the moving alignment mechanism. The moving alignment mechanism can drive the tundish 1 and the nozzle 2 to move back and forth relative to the baking furnace in the lateral and longitudinal directions. The distance measuring instrument 3 is used to measure the positional relationship between the nozzle 2 and the baking furnace 16, thereby determining whether the two are laterally aligned.

[0037] Example 2

[0038] like Figure 1-3 As shown, based on Embodiment 1, the moving centering mechanism is further defined, and Embodiment 2 with the defined mechanism has better performance.

[0039] The mobile centering mechanism includes a mobile trolley 4 and a middle bag frame. The middle bag 1 is mounted on the mobile trolley 4, and the mobile trolley 4 is mounted on the middle bag frame. The bottom of the middle bag frame is equipped with wheels. The mobile trolley 4 can drive the middle bag 1 to move back and forth in the lateral direction on the middle bag frame. The middle bag frame can move back and forth in the longitudinal direction through the wheels.

[0040] Furthermore, the intermediate baggage frame includes an upper intermediate baggage frame 20 and a lower intermediate baggage frame 7. A mobile trolley 4 is mounted on the upper intermediate baggage frame 20. The mobile trolley 4 can drive the intermediate bag 1 to move back and forth laterally on the upper intermediate baggage frame 20. The upper intermediate baggage frame 20 is mounted on the lower intermediate baggage frame 7. A lifting system 23 is provided between the upper intermediate baggage frame 20 and the lower intermediate baggage frame 7. Wheels are mounted at the bottom of the lower intermediate baggage frame 7. The lower intermediate baggage frame 7 can move back and forth longitudinally via the wheels.

[0041] Furthermore, a pulley 5 is provided between the bottom of the mobile trolley 4 and the upper frame 20 of the medium-sized baggage cart. A transverse drive system 21 is provided on the upper frame 20 of the medium-sized baggage cart. The transverse drive system 21 is connected to the mobile trolley 4. The transverse drive system 21 drives the mobile trolley 4 to move back and forth laterally on the upper frame 20 of the medium-sized baggage cart via the pulley 5. A sensor 22 is provided on the transverse drive system 21.

[0042] Furthermore, the wheels are connected to a drive system, and the drive system 9 is equipped with an encoder; the wheel axle is fixed to the lower frame 7 of the middle car via a mounting plate 8.

[0043] The lower frame 7 of the medium-sized car has a longitudinally arranged track underneath, and the wheels are set on the track. The lower frame 7 of the medium-sized car moves back and forth along the track by means of the wheels.

[0044] Furthermore, the lower end of the sprue 2 passes through the top hole of the baking oven 16 and is inserted into the baking oven 16. The bottom hole of the baking oven 16 is connected to a bottom suction pipe, which is connected to a fan 13. The fan 13 is connected to a smoke exhaust pipe. The top hole and bottom hole of the baking oven 16 are arranged on the same axis.

[0045] Furthermore, the top hole and bottom hole are located at the center of the top and bottom surfaces of the baking oven 16, respectively.

[0046] Furthermore, a sealing device 19 is provided between the top hole of the baking oven 16 and the water inlet 2.

[0047] Furthermore, there are two rangefinders, symmetrically arranged on both sides of the baking oven 16, arranged sequentially along the width of the intermediate package 1. The rangefinders are fixedly connected to the baking oven 16 through the cylindrical support 6.

[0048] Example 3

[0049] like Figure 1-3 As shown, based on Examples 1 and 2, the intermediate tundish is further limited to having two gates, and the performance of Example 3 after the limitation is even better.

[0050] Two sprue nozzles 2 are arranged sequentially along the length of the bottom of the intermediate ladle 1. A distance sensor 24 is installed on each side of the line connecting the center lines of the two sprue nozzles 2 to determine the alignment of the sprue nozzles 2 with the baking oven 16 along the length of the intermediate ladle 1.

[0051] Furthermore, a baking oven 16 is provided below each sprue 2. Along the length of the intermediate ladle 1, a column 17 is designed on both sides of the extension line of the center line of the two baking ovens 16. A displacement sensor 18 is provided on each column 17. After the sensor 18 is installed, the distance between the left sensor and the left baking oven 16 is c, and the distance between the right sensor and the right baking oven 16 is d. At the same time, the real-time position and centering of the baking oven 16 can be measured by the reading of the sensor 18.

[0052] The working principle of this invention: The intermediate ladle equipment is mainly divided into three parts: a mobile trolley 4, an upper frame 20, and a lower frame 7. The mobile trolley 4 has a concave steel structure on which the intermediate ladle 1 is placed. The intermediate ladle 1 has multiple sprue nozzles 2 along its length. Below each nozzle is a baking oven 16. The opening diameter of the baking oven 16 is larger than the diameter of the nozzle 2. Therefore, a sealing device 19 is designed between the baking oven 16 and the nozzle 2, mainly used to seal the area between the nozzle 2 and the baking oven 16, reducing heat loss during the baking process. The baking oven 16 has two symmetrically distributed cylindrical supports 6 along the width of the intermediate ladle 1. Each cylindrical support 6 is equipped with a rangefinder 3. The rangefinder 3 is mainly used to measure the positional difference between the sprue 2 and the baking oven 16. During installation, the distances from the two rangefinders 3 to the center of the baking oven 16 must be equal through distance adjustment. A downward extraction pipe 11 is designed below the baking oven, and an exhaust pipe 12 and a fan 13 are designed at the end of the downward extraction pipe 11. When the sprue 2 needs to be baked, the fan 13 is started to draw the hot air in the tundish 1 downwards, passing through the sprue 2, the baking oven 16, the downward extraction pipe 11, and the exhaust pipe 12 in sequence, so as to realize the purpose of baking the sprue 2 using the baking heat energy of the tundish and reduce the baking energy consumption of the sprue 2. The downward extraction air volume through the sprue 2 can be controlled by the rotation speed of the fan 13, thereby controlling the baking curve and heating rate of the sprue 2. The moving trolley 4 moves downwards. The design includes pulleys 5, which are placed on the upper frame 20 of the medium-sized baggage cart. A lateral movement drive system 21 is located on the left side of the moving trolley 4. The fixed end of the lateral movement drive system 21 is fixed to the upper frame 20, and the moving end is fixed to the moving trolley 4. The lateral movement drive system 21 allows the moving trolley 4 to move left and right on the upper frame 20 by extension (using a pneumatic or hydraulic cylinder) or rotation (using a motor and screw drive). A sensor 22 is also installed on the lateral movement drive system 21 to monitor the distance it moves in real time. Multiple lifting systems 23 are installed on the upper frame 20, with one end of each lifting system 23 fixed to the upper frame 20. The upper end is fixed to the lower frame 7 of the intermediate trolley, and the other end is fixed to the lower frame 7 of the intermediate trolley. In this way, the height of the upper frame 20 of the intermediate trolley and the moving trolley 4, intermediate trolley 1 and sprue 2 on the upper frame 20 of the intermediate trolley can be adjusted by lifting the upper frame 23. The lower frame 7 of the intermediate trolley is designed with mounting plates 8 on both sides. The mounting plates 8 are fixed with drive systems 9. The drive systems 9 are connected to wheels 14. The wheels 14 are installed on the track 15. In this way, the rotation of the drive systems 9 can drive the wheels 14 to rotate forward and backward, thereby driving the intermediate trolley equipment and the intermediate trolley 1 and sprue 2 above to move left and right along the track. Each drive system 9 is designed with an encoder 10. The distance moved by the wheels 14 can be accurately measured and displayed in real time by the rotation speed and the diameter of the wheels 14.Along the length of the tundish 1, a column 17 is designed on the extended centerline of each of the two baking ovens 16. Each column 17 is equipped with a displacement sensor 18. After the sensors 18 are installed, the distance from the left sensor to the left baking oven 16 is c, and the distance from the right sensor to the right baking oven 16 is d. The real-time position and alignment of the baking ovens 16 can be measured by reading the sensors 18. A distance measuring sensor 24 is installed on each side of the line connecting the centerlines of the two sprue nozzles 2, mainly used to determine the alignment of the sprue nozzles 2 and the baking ovens 16 along the length of the tundish 1.

[0053] The automatic sprue alignment process is as follows:

[0054] Step 1: Under normal operating conditions, the lifting system 23 extends, the upper frame 20 of the middle tray is at its highest position, the displacement sensor 18 is energized and measures the distance to the nearest baking oven 16 in real time. The real-time measurement value of the left sensor 18 is recorded as x1, and the real-time measurement value of the right sensor 18 is recorded as x2. If |x1-c|≥e, where e is the system's allowable deviation, then "The position of the left baking oven has shifted, please restore" is displayed; if |x2-d|≥e, where e is the system's allowable deviation, then "The position of the right baking oven has shifted, please restore" is displayed; if |x1-c|≥e and |x2-d|≥e, then "The positions of both left and right baking ovens have shifted, please restore" is displayed; unless the baking oven position is restored and the "Fault Recovery" button is clicked, the alarm will remain; after the fault is recovered, proceed to Step 2.

[0055] Step 2: After the intermediate bag 1 lands on the traverse trolley 4, the lowest edge of the sprue 2 is higher than the upper plane of the baking oven 16 and the measuring line of the distance sensor 24. The distance sensor 24 and the distance measuring instrument 3 are powered on and started. The real-time measurement values ​​of the two distance measuring instruments 3 on the left baking oven 16 are recorded as a1 and b1, respectively. The real-time measurement values ​​of the two distance measuring instruments 3 on the right baking oven 16 are recorded as a2 and b2, respectively. If |a1-a2|≥f, where f is the system's allowable deviation, the system displays "The intermediate bag's tilt is too large, and it needs to be landed again." The traverse drive system 21 is locked. The traverse drive system 21 is unlocked when |a1-a2|<f, and the process proceeds to step 3.

[0056] Step 3: Record the measured values ​​of the two distance sensors 24 as L1 and L2 respectively. At this time, both L1 and L2 are s, where s is the distance between the two distance sensors 24. Start the lifting system 23 to retract until L1 < s / 2 and L2 < s / 2, then the lifting system 23 stops moving and proceeds to step 4.

[0057] Step 4: If L1 > L2, the drive system 9 starts and drives the upper frame 20 of the medium-sized baggage car to move to the left along the track 15 through the wheels 14 until L1 = L2, then the drive system 9 stops and proceeds to step 4; if L1 < L2, the drive system 9 starts and drives the upper frame 20 of the medium-sized baggage car to move to the right along the track 15 through the wheels 14 until L1 = L2, then the drive system 9 stops and proceeds to step 5.

[0058] Step 5: ① If a1 > b1, move (a1-b1) / 2 along the width direction of the intermediate bag 1 towards the lateral drive system 21, and record the displacement value through the sensor 22 until a1 = b1; if a1 > a2, then move (a1-a2) / 2 in the opposite direction along the width direction of the intermediate bag 1 towards the lateral drive system 21; otherwise, move (a2-a1) / 2 along the width direction of the intermediate bag 1 towards the lateral drive system 21; ② If a When 1 < b1, move (b1-a1) / 2 in the opposite direction of the transverse drive system 21 along the width direction of the intermediate bag 1, and record its displacement value through the sensor 22 until a1 = b1; if a1 > a2, then move (a1-a2) / 2 in the opposite direction of the transverse drive system 21 along the width direction of the intermediate bag 1; otherwise, move (a2-a1) / 2 in the direction of the transverse drive system 21 along the width direction of the intermediate bag 1; proceed to step 6;

[0059] Step 6: Start the lifting system 23 to retract it, and move the upper frame 20 of the intermediate ladle 1 and the sprue 2 downward until 2 / 3 of the sprue 2 is inserted into the baking oven 16. Then stop the lifting system 23 and use the sealing device 19 to seal the gap between the sprue 2 and the baking oven 16. After sealing is completed, proceed to step 7.

[0060] Step 7: Start the fan 13 so that the heat generated by the baking device above the intermediate ladle 1 passes through the sprue 2, baking oven 16, lower extraction pipe 11 and exhaust pipe 12 in sequence to bake the sprue 2. When the baking temperature of the sprue 2 reaches the preset temperature, turn off the fan 13, the distance sensor 24 and the distance measuring instrument 3 lose power, and the system ends.

[0061] This invention patent develops an automatic nozzle alignment system and method for tundish baking in continuous casting. The overall system has a simple structure, is easy to install, inexpensive, and highly applicable. Through logical judgment of measured data from two rangefinders, it can automatically determine whether the baking furnace position is aligned. Data from rangefinder sensors on both sides of the baking furnace can automatically determine the alignment of the nozzle along the length of the tundish. Simultaneously, the drive system, which rotates the wheels in both directions, enables automatic alignment of the nozzle along the length of the tundish. The baking furnace has a hollow structure and includes a bottom extraction pipe and a flue gas pipe. The sprue nozzles are baked using the heat energy from the tundish, achieving energy-saving baking. The downward airflow from the nozzles can be controlled by adjusting the fan speed, thereby controlling the baking curve and heating rate of nozzle 2. By installing displacement sensors on the baking oven, the centering accuracy of the nozzles along the width of the tundish is automatically determined, and the lateral movement trolley is moved left and right by the lateral drive system, achieving self-centering of the nozzles along the width of the tundish. The tundish trolley is designed with a split upper and lower structure, and the height of the nozzles can be adjusted by the lifting system.

[0062] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An automatic centering method using an automatic nozzle centering system for continuous casting tundish baking, characterized in that, The automatic sprue centering system for tundish baking in continuous casting includes a tundish (1), a moving centering mechanism, and a baking furnace (16). The tundish (1) is mounted on the moving centering mechanism, and the baking furnace (16) is mounted below the tundish (1). A sprue (2) is provided at the bottom of the tundish (1), and the lower end of the sprue (2) is inserted into the baking furnace (16). A rangefinder (3) is mounted on the moving centering mechanism. The moving centering mechanism can drive the tundish (1) and the sprue (2) to move back and forth in the horizontal and vertical directions relative to the baking furnace. The mobile centering mechanism includes a mobile trolley (4) and a middle bag frame. The middle bag (1) is set on the mobile trolley (4), and the mobile trolley (4) is set on the middle bag frame. The bottom of the middle bag frame is equipped with wheels. The mobile trolley (4) can drive the middle bag (1) to move back and forth in the transverse direction on the middle bag frame. The middle bag frame can move back and forth in the longitudinal direction through the wheels. The intermediate baggage frame includes an upper frame (20) and a lower frame (7). A trolley (4) is set on the upper frame (20). The trolley (4) can drive the intermediate bag (1) to move back and forth on the upper frame (20) in the transverse direction. The upper frame (20) is set on the lower frame (7). A lifting system (23) is provided between the upper frame (20) and the lower frame (7). The wheels are set at the bottom of the lower frame (7). The lower frame (7) can move back and forth in the longitudinal direction through the wheels. A pulley (5) is provided between the bottom of the mobile trolley (4) and the upper frame (20) of the medium-sized baggage cart. A transverse drive system (21) is provided on the upper frame (20) of the medium-sized baggage cart. The transverse drive system (21) is connected to the mobile trolley (4). The transverse drive system (21) drives the mobile trolley (4) to move back and forth on the upper frame (20) of the medium-sized baggage cart through the pulley (5). A sensor (22) is provided on the transverse drive system (21). The wheels are connected to a drive system (9), and the drive system is equipped with an encoder; The lower frame (7) of the medium-sized car has a longitudinally arranged track, and the wheels are set on the track. The lower frame (7) of the medium-sized car moves back and forth along the track by means of the wheels. Two water inlets (2) are arranged sequentially along the length of the bottom of the intermediate bag (1). A distance sensor (24) is installed on each side of the line connecting the center lines of the two water inlets (2) to determine the alignment of the water inlets (2) with the baking oven (16) along the length of the intermediate bag (1). Below each sprue (2) is a baking oven (16). Along the length of the intermediate package (1), on both sides of the extension line of the center line of the two baking ovens (16), there is a column (17). Each column (17) is equipped with a displacement sensor (18). The automatic centering method includes the following steps: Step 1: Under normal operating conditions, the lifting system (23) extends, the upper frame (20) of the middle baggage truck is at its highest position, the displacement sensor (18) is energized and measures the distance between itself and the nearest baking oven (16) in real time. The real-time measurement value of the left displacement sensor (18) is recorded as x1, and the real-time measurement value of the right displacement sensor (18) is recorded as x2. If |x1-c|≥e, where c is the distance between the left displacement sensor (18) and the left baking oven (16), and e is the system allowable deviation, then the message "The position of the left baking oven has shifted, please restore" is displayed. If |x2-d|≥e, where d is the distance between the right displacement sensor and the right baking oven (16), and e is the system allowable deviation, then the message "The position of the right baking oven has shifted, please restore" is displayed. If |x1-c|≥e and |x2-d|≥e, then the message "The positions of the baking ovens on both sides have shifted, please restore" is displayed. Unless the baking oven position is restored and the "Fault Recovery" button is clicked, the alarm will remain. After the fault is recovered, the alarm will continue. Step 2: After the intermediate bag (1) lands on the moving trolley (4), the lowest edge of the sprue (2) is higher than the upper plane of the baking oven (16) and the measuring line of the distance sensor (24). The distance sensor (24) and the distance measuring instrument (3) are powered on and started. The real-time measurement values ​​of the two distance measuring instruments (3) on the left baking oven (16) are recorded as a1 and b1 respectively. The real-time measurement values ​​of the two distance measuring instruments (3) on the right baking oven (16) are recorded as a2 and b2 respectively. If |a1-a2|≥f, where f is the system allowable deviation, the system displays "The inclination of the intermediate bag landing is too large, and the bag needs to be re-landed". The transverse drive system (21) is locked. The transverse drive system (21) is unlocked when |a1-a2|<f. Step 3: The measured values ​​of the two distance sensors (24) are recorded as L1 and L2 respectively. At this time, L1 and L2 are both s, and s is the distance between the two distance sensors (24). Start the lifting system (23) to retract it until L1 < s / 2 and L2 < s / 2, then the lifting system (23) stops moving. Step 4: If L1 > L2, the drive system (9) starts and drives the upper frame (20) of the middle baggage car to move to the left along the track (15) through the wheels (14) until L1 = L2, then the drive system (9) stops and proceeds to step 5. If L1 < L2, the drive system (9) starts and drives the upper frame (20) of the medium-sized car to move to the right along the track (15) through the wheels (14) until L1 = L2, at which point the drive system (9) stops and proceeds to step 5; Step 5: If a1 > b1, move (a1-b1) / 2 along the width direction of the intermediate bag (1) towards the direction of the lateral drive system (21) via the lateral drive system (21), and record its displacement value via the sensor (22) until a1 = b1; if a1 > a2, then move (a1-a2) / 2 in the opposite direction along the width direction of the intermediate bag (1) towards the direction of the lateral drive system (21); otherwise, move (a2-a1) / 2 along the width direction of the intermediate bag (1) towards the direction of the lateral drive system (21). If a1 < b1, move (b1-a1) / 2 in the opposite direction of the transverse drive system (21) along the width direction of the intermediate bag (1), and record its displacement value through the sensor (22) until a1 = b1; if a1 > a2, move (a1-a2) / 2 in the opposite direction of the transverse drive system (21) along the width direction of the intermediate bag (1); otherwise, move (a2-a1) / 2 in the direction of the transverse drive system (21) along the width direction of the intermediate bag (1). Step 6: Start the lifting system to retract it, and move the upper frame of the intermediate ladle car, the intermediate ladle and the sprue downwards until 2 / 3 of the sprue is inserted into the baking oven. Stop the lifting system and use the sealing device to seal the gap between the sprue and the baking oven. After sealing is completed; Step 7: Start the fan so that the heat generated by the baking oven above the intermediate ladle passes through the sprue, baking oven, lower exhaust pipe and flue pipe in sequence to bake the sprue. When the baking temperature of the sprue reaches the preset temperature, turn off the fan, the distance sensor and distance meter lose power, and the system ends.

2. The automatic centering method according to claim 1, characterized in that, The lower end of the water inlet (2) passes through the top hole of the baking oven (16) and is inserted into the baking oven (16). The bottom hole of the baking oven (16) is connected to a bottom suction pipe, and the bottom suction pipe is connected to a fan (13). The fan (13) is connected to a smoke exhaust pipe. The top hole and bottom hole of the baking oven (16) are arranged on the same axis.

3. The automatic centering method according to claim 1, characterized in that, The wheel axle is fixed to the lower frame (7) of the middle car by mounting plate (8).

4. The automatic centering method according to claim 1, characterized in that, Two rangefinders are symmetrically arranged on both sides of the baking oven (16) and arranged sequentially along the width of the intermediate bun (1).

5. The automatic centering method according to any one of claims 1-4, characterized in that, The baking oven (16) is designed with two cylindrical supports (6) along the width of the intermediate bun (1) and they are symmetrically distributed. Each cylindrical support (6) is equipped with a rangefinder (3).

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