Adaptive control device and control method for secondary cooling nozzles at the edge of continuous casting machine

Abstract

This invention relates to the field of metallurgical equipment technology and discloses an adaptive control device for the secondary cooling nozzles at the edge of a continuous casting machine. The device includes two spraying units, each with two vertical guide columns. Each guide column is fitted with a sleeve, which is raised and lowered by a lifting system. A mounting block connects the two sleeves, and a movable block is located inside the mounting block. The movable block has nozzles facing the cast billet, and a connecting rod is located on the other side of the movable block. Both ends of the connecting rod are fitted onto the guide rods via sleeves. The movable block reciprocates via a horizontal telescopic system mounted on the mounting block. This invention also discloses a control method for the adaptive control device and method for the secondary cooling nozzles at the edge of a continuous casting machine. This invention enables adaptive control of the nozzle distance and angle under varying billet width conditions, ensuring good narrow-face cooling effect and reducing the occurrence of transverse and longitudinal cracks.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment technology, specifically to an adaptive control device and control method for the secondary cooling nozzles at the edge of a continuous casting machine. Background Technology

[0002] Corner transverse cracks in slabs have long been a quality problem plaguing steel mills both domestically and internationally. The appearance of corner transverse cracks leads to increased slab cleaning and a decrease in steel yield. Currently, there are generally two technological approaches to solving corner transverse cracks in slabs: one is to control the surface temperature of the slab during bending and straightening using either a "hot" or "cold" process to avoid the high-temperature brittle range of steel; the other is to control the microstructure of the slab surface to form a layer with strong crack resistance, making it less prone to cracking. However, both of these technologies are not yet fully mature.

[0003] Previously, some companies conducted a series of experiments based on the "cold-flow" control concept, which involved adding nozzles to the narrow face of the billet to accelerate the cooling efficiency of the narrow face. Results showed that this method could indeed effectively reduce the occurrence of transverse cracks at the slab corners. However, in actual production, due to the continuous variation in billet width, the distance between the nozzle and the narrow face of the billet changes even when the nozzle is fixed, leading to poor cooling effect and potentially increasing the probability of cracking. This is precisely why the narrow face cooling technology for billets has remained unresolved. Therefore, there is an urgent need to develop an adaptive control device and method for the secondary cooling nozzles at the edge of a continuous casting machine. This device would enable adaptive control of the nozzle distance and angle under varying billet width conditions, ensuring good narrow face cooling effect, thereby reducing transverse and longitudinal cracks and improving the quality of the billet product.

[0004] Chinese Patent (Publication Date: December 21, 2011, Publication No.: CN102284687A) discloses an automatic cleaning and maintenance method for secondary cooling nozzles in continuous casting. When the system reaches the cleaning conditions, the field controller sends a start signal to each electromagnetic distributor. The electromagnetic valves inside the electromagnetic distributor are activated sequentially. When the electromagnetic valve corresponding to a certain group of nozzles is activated, compressed air enters the compressed air control pipeline above the nozzle, and the compressed air control pipeline side is exhausted. The piston moves upward to lift the guide core, and at the same time, the supply of atomizing gas is cut off. The distance between the lower part of the guide core and the isolation plate is increased to 3mm. The pressurized water flow instantly washes away the impurities, and this process lasts for 2-5 seconds. After cleaning, the solenoid valve of this circuit is closed, compressed air enters the compressed air control line, the compressed air control line exhausts, the piston moves down, and the lower part of the guide core is pressed tightly against the isolation plate. The nozzle enters the normal atomization state. The advantage is that it solves the problem of severe clogging of the secondary cooling nozzle, improves the cooling effect of the billet, and the nozzle spray characteristics meet the process requirements. However, this device is only used for cleaning and maintenance of the secondary cooling nozzle.

[0005] Chinese Patent (Publication Date: January 4, 2012, Publication No.: CN102303107A) discloses a water flow density measurement system for the secondary cooling nozzle of a slab continuous casting machine. The system includes at least a nozzle moving mechanism, a nozzle, a signal conditioner, a computer data acquisition and analysis unit, a water collector, and a sensor moving mechanism. The water collector is fixed on the sensor moving mechanism and moves to the detection position via the sensor moving mechanism. The nozzle is fixed on the nozzle moving mechanism, pointing downwards. The nozzle moves above the water collector via the nozzle moving mechanism, and water is sprayed from the nozzle. A liquid level sensor inside the water collector provides the density of water sprayed in different spaces. The signal is amplified and processed by the signal conditioner, and then output to the computer data acquisition and analysis unit to provide a three-dimensional water density distribution map. This system offers accurate measurement, short measurement time, and low measurement cost. However, it is primarily used for physical testing of nozzle characteristics and cannot be used in production environments.

[0006] Chinese Patent (Publication Date: May 28, 2008, Publication No.: CN101187618A) discloses a method for arranging secondary cooling nozzles in a straight-arc slab continuous casting machine. The arrangement is as follows: three secondary cooling nozzles are arranged in the width direction of both the curved section and the arc section of the continuous casting machine, symmetrically arranged around the center of the slab width, with a nozzle spacing of 600mm to 900mm; two secondary cooling nozzles are arranged in the width direction of the straightening section of the continuous casting machine, symmetrically arranged around the center of the slab width, with a nozzle spacing of 400mm to 600mm. The secondary cooling nozzles are ordinary continuous casting aerosol nozzles with a spray angle of 90° to 130°. The advantage is that it effectively improves the excessive stress caused by uneven temperature across the slab width, improves the surface quality of the slab, and has wide applicability. However, this arrangement cannot meet the cooling requirements of the narrow face of the slab. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing an adaptive control device and method for the secondary cooling nozzles at the edge of a continuous casting machine. This device enables adaptive control of the nozzle distance and angle under varying billet width conditions, ensuring good narrow-face cooling effect and reducing the occurrence of transverse and longitudinal cracks.

[0008] To achieve the above objectives, the adaptive control device for the secondary cooling nozzles on the side of a continuous casting machine involved in this invention includes two spray devices. The spray devices are symmetrically arranged on both sides of the continuous casting machine with the width centerline of the billet as the center. Each spray device includes two vertical guide columns, and a sleeve is fitted on each guide column. The sleeve is raised and lowered by a lifting system. A mounting block is connected between the two sleeves. The side of the mounting block facing the billet is hollow, and a movable block parallel to the mounting block is provided inside. The movable block is provided with several nozzles facing the billet. At least two vertical connecting rods are provided on the other side of the movable block. Both ends of the connecting rods are fitted onto the guide rods through sleeves. One end of the guide rod is fixed to the inner wall of the mounting block, and the other end faces the billet. The movable block reciprocates through a horizontal telescopic system provided on the mounting block.

[0009] Preferably, the lifting system is equipped with a displacement sensor for detecting the displacement of the sleeve, the mounting block is equipped with a fixed frame, the fixed frame is equipped with a transverse movement system, a mechanical probe is installed on the movable side of the transverse movement system, the mechanical probe moves toward the casting billet through the transverse movement system, the mechanical probe is equipped with a rangefinder and a pressure sensor, and the horizontal telescopic system is equipped with a displacement detection device for detecting the displacement of the movable block.

[0010] Preferably, the nozzle is connected to a pressure and flow detection and control system, and the pressure and flow detection and control system is connected to a medium pipe.

[0011] Preferably, the two ends of the guide post are fixedly installed by mounting plates.

[0012] Preferably, the shape of the mounting block corresponds to the shape of the cast billet.

[0013] Preferably, the nozzles are at the same height.

[0014] A control method for an adaptive control device for the secondary cooling nozzle at the edge of a continuous casting machine includes the following steps:

[0015] A) Upon receiving the "start casting" command, the continuous casting rollers of the continuous casting machine rotate and drive the billet to move. Based on the steel grade information, the optimal distance between the nozzle and the end face of the billet is obtained.

[0016] B) Obtain the casting thickness of the billet and the height of the nozzle centerline from the lower roller surface, and adjust the lifting system so that the height of the nozzle centerline from the lower roller surface is half of the casting thickness of the billet.

[0017] C) Control the two horizontal telescopic systems on the left and right to move towards the billet, so that the distance between the nozzle and the end face of the billet is the optimal distance obtained in step A);

[0018] D) The nozzle continuously sprays water onto the narrow face of the billet;

[0019] E) After casting is completed, control the two horizontal telescopic systems on the left and right to move away from the billet and return to the initial position.

[0020] Preferably, the lifting system is equipped with a displacement sensor for detecting the displacement of the sleeve, the mounting block is equipped with a fixed frame, the fixed frame is equipped with a transverse movement system, a mechanical probe is mounted on the movable side of the transverse movement system, the mechanical probe moves toward the casting billet through the transverse movement system, the mechanical probe is equipped with a rangefinder and a pressure sensor, and the horizontal telescopic system is equipped with a displacement detection device for detecting the displacement of the movable block. The control includes the following steps:

[0021] A) Upon receiving the "start casting" command, the continuous casting rollers of the continuous casting machine rotate and drive the billet to move. Based on the steel grade information, the optimal distance c between the nozzle and the end face of the billet is obtained.

[0022] B) Obtain the casting thickness h of the billet, and use a displacement sensor to obtain the height a of the nozzle centerline from the lower roller surface. When it is found that a≠h / 2, adjust the lifting system so that the height a of the nozzle centerline from the lower roller surface is half of the casting thickness h of the billet.

[0023] C) Adjust the mechanical probe to its initial position using the lateral movement system, and use a rangefinder to detect that the distance between the two paired mechanical probes is the preset value s;

[0024] D) Adjust the nozzle to the initial position using the horizontal telescopic system, and use the displacement detection device to detect that the distance between the two paired nozzles is s;

[0025] E) Control the left and right lateral movement systems to move towards the billet, record the change value b1 of the rangefinder on the left side of the billet compared to before the movement and the real-time value p1 of the pressure sensor, the change value b2 of the rangefinder on the right side of the billet compared to before the movement and the real-time value p2 of the pressure sensor. When p1≥e and p2≥e, where e is the pressure set value, and b1 and b2 have not changed within a few seconds, control the lateral movement system to move away from the billet, so that the mechanical probe is adjusted to the initial position.

[0026] F) Control the left and right horizontal telescopic systems to move towards the billet, and record the changes f1 and f2 of the left and right displacement detection devices compared to before the movement. When f1 = b1 - c, the left horizontal telescopic system stops moving, and when f2 = b2 - c, the right horizontal telescopic system stops moving.

[0027] G) Continuously spray the narrow face of the billet;

[0028] H) After casting is completed, control the two horizontal telescopic systems on the left and right to move away from the billet and return to the initial position.

[0029] Preferably, the nozzle is connected to a pressure and flow detection and control system, and the pressure and flow detection and control system is connected to a medium pipe. In step G), the pressure and flow of each nozzle are adjusted to a preset pressure value P by the pressure and flow detection and control system. 设 and the preset value of flow rate V 设 Then, the narrow face of the billet is continuously sprayed. If the pressure P of any nozzle... n and traffic V n Greater than or less than (0.9-1.1)P 设 Or (0.9-1.1)V 设 If the pressure or flow rate of nozzle n is abnormal, please notify us and check after stopping the machine.

[0030] Preferably, in step E), if |b1-b2|≥k, where k is a system setting value, an alarm is triggered to remind that the center line of the billet is not aligned, and an inspection is performed after casting is completed.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. To achieve adaptive control of nozzle distance and angle under varying billet width conditions, ensuring good narrow-face cooling effect and reducing the occurrence of transverse and longitudinal cracks;

[0033] 2. The nozzle is precisely adjusted and controlled along the height of the billet through a lifting system and a displacement sensor;

[0034] 3. Through the transverse system, rangefinder and mechanical probe, the distance between the mechanical probe and the narrow face of the billet can be accurately measured, and the center line of the billet can be automatically judged to be coincident with the center line of the continuous casting machine by the measured values ​​of the distance between the mechanical probe and the billet on the left and right sides.

[0035] 4. The pressure and flow detection and control system enables precise setting of the flow and pressure of each nozzle, and can automatically determine nozzle blockage or other abnormal operating conditions by measuring changes in the values.

[0036] 5. Through the integrated design of the movable block, connecting rod and sleeve, the simultaneous dynamic adjustment of multiple nozzles is realized, and the design of the guide rod and sleeve greatly reduces the movement resistance;

[0037] 6. By designing the mounting blocks with different curvatures and utilizing the mounting plate, the entire device can be quickly installed on the fan-shaped sections in different areas, meeting the needs of narrow-face spray cooling in different areas of the cast billet.

[0038] 7. The overall system has a simple structure, low price, and strong applicability. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine according to the present invention.

[0040] Figure 2 for Figure 1 Cross-sectional perspective view of AA;

[0041] Figure 3 for Figure 1 Schematic diagram of the internal structure of the central spray device;

[0042] Figure 4 This is a schematic diagram of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine installed on the continuous casting machine.

[0043] The components in the diagram are labeled as follows:

[0044] 1. Spraying device; 2. Cast billet; 3. Continuous casting machine; 4. Guide column; 5. Sleeve; 6. Lifting system; 7. Mounting block; 8. Movable block; 9. Nozzle; 10. Connecting rod; 11. Sleeve; 12. Guide rod; 13. Horizontal telescopic system; 14. Displacement sensor; 15. Fixing frame; 16. Lateral movement system; 17. Mechanical probe; 18. Rangefinder; 19. Pressure sensor; 20. Displacement detection device; 21. Pressure and flow detection and control system; 22. Medium pipe; 23. Mounting plate; 24. Continuous casting roll. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figure 4 The diagram shows the structure of the continuous casting machine 3. The continuous casting machine 3 is mainly composed of multiple continuous casting rolls 24. Every 5 to 7 pairs of continuous casting rolls 24 form a sector segment. The sector segment is divided into arc segment, straightening segment and horizontal segment according to its installation position. Corresponding spray devices 1 can be installed on different sector segments, namely, the arc segment narrow surface spray device, the straightening segment narrow surface spray device and the horizontal segment narrow surface spray device.

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an adaptive control device for the secondary cooling nozzles on the side of a continuous casting machine includes two spray devices 1. The spray devices 1 are symmetrically arranged on both sides of the continuous casting machine 3 with the width centerline of the billet 2 as the center. Each spray device 1 includes two vertical guide columns 4, and each guide column 4 is fitted with a sleeve 5. The sleeve 5 is raised and lowered by a lifting system 6, which can be a hydraulic cylinder, a pneumatic cylinder, or a stepper motor, etc. A mounting block 7 is connected between the two sleeves 5. The side of the mounting block 7 facing the billet 2 is hollow, and a movable block 8 parallel to the mounting block 7 is provided inside. The movable block 8 is provided with several nozzles 9 facing the billet 2. The other side of the movable block 8 is provided with at least two vertical connecting rods 10. Both ends of the connecting rods 10 are fitted onto guide rods 12 through sleeves 11. One end of the guide rod 12 is fixed to the inner wall of the mounting block 7, and the other end faces the billet 2. The movable block 8 moves back and forth by a horizontal telescopic system 13 provided on the mounting block 7.

[0048] When using this embodiment, the following steps are included:

[0049] A) Upon receiving the "start casting" command, the continuous casting roller 24 of the continuous casting machine 3 rotates and drives the billet 2 to move. Based on the steel grade information, the optimal distance between the nozzle 9 and the end face of the billet 2 is obtained.

[0050] B) Obtain the casting thickness of billet 2 and the height of the nozzle centerline from the lower roller surface, and adjust the lifting system 6 so that the height of the nozzle centerline from the lower roller surface is half the casting thickness of billet 2.

[0051] C) Control the two horizontal telescopic systems 13 on the left and right to move towards the billet 2, so that the distance between the nozzle 9 and the end face of the billet 2 is the optimal distance obtained in step A;

[0052] D) Nozzle 9 continuously sprays water onto the narrow surface of the billet 2;

[0053] E) After casting is completed, control the two horizontal telescopic systems 13 on the left and right to move away from the billet 2 and return to the initial position.

[0054] In another embodiment, an adaptive control device for the secondary cooling nozzles on the side of a continuous casting machine includes two spray devices 1. The spray devices 1 are symmetrically arranged on both sides of the continuous casting machine 3 with the width centerline of the billet 2 as the center. Each spray device 1 includes two vertical guide columns 4, and each guide column 4 is fitted with a sleeve 5. The sleeve 5 is raised and lowered by a lifting system 6, which can be a hydraulic cylinder, a pneumatic cylinder, or a stepper motor, etc. A mounting block 7 is connected between the two sleeves 5. The side of the mounting block 7 facing the billet 2 is hollow, and a movable block 8 parallel to the mounting block 7 is provided inside. The movable block 8 is provided with several nozzles 9 facing the billet 2. The other side of the movable block 8 is provided with at least two vertical connecting rods 10. Both ends of the connecting rods 10 are fitted onto guide rods 12 through sleeves 11. One end of the guide rod 12 is fixed to the inner wall of the mounting block 7, and the other end faces the billet 2. The movable block 8 moves back and forth by a horizontal telescopic system 13 provided on the mounting block 7.

[0055] The lifting system 6 is equipped with a displacement sensor 14 to detect the displacement of the sleeve 5, which can accurately control the lifting distance of the sleeve 5 and the mounting block 7 fixed on the sleeve 5. The mounting block 7 is equipped with a fixed frame 15, and the fixed frame 15 is equipped with a transverse system 16. The transverse system 16 can be a hydraulic cylinder, a pneumatic cylinder, or a stepper motor, etc. A mechanical probe 17 is installed on the movable side of the transverse system 16. The mechanical probe 17 moves toward the casting billet 2 through the transverse system 16. The mechanical probe 17 is equipped with a rangefinder 18 and a pressure sensor 19. The rangefinder 18 can accurately measure and control the moving distance of the mechanical probe 17. By the change of the pressure value of the pressure sensor 19, it can be confirmed whether the mechanical probe 17 is in contact with the casting billet 2 and the degree of contact. The horizontal telescopic system 13 is equipped with a displacement detection device 20 to detect the displacement of the movable block 8.

[0056] When using this embodiment, the following steps are included:

[0057] A) Upon receiving the "start casting" command, the continuous casting roller 24 of the continuous casting machine 3 rotates and drives the billet 2 to move. Based on the steel grade information, the optimal distance c between the nozzle 9 and the end face of the billet 2 is obtained.

[0058] B) Obtain the casting thickness h of the billet 2, and use the displacement sensor 14 to obtain the height a of the nozzle 9 center line from the lower roller surface. When it is found that a≠h / 2, adjust the lifting system 6 so that the height a of the nozzle 9 center line from the lower roller surface is half of the casting thickness h of the billet 2.

[0059] C) The mechanical probe 17 is adjusted to the initial position by the transverse system 16, and the distance between the two paired mechanical probes 17 is measured by the rangefinder 18 to make the distance between the two paired mechanical probes 17 the preset value s;

[0060] D) Adjust the nozzle 9 to the initial position using the horizontal telescopic system 13, and use the displacement detection device 20 to detect it, so that the distance between the two paired nozzles 9 is s;

[0061] E) Control the two horizontal movement systems 16 to move towards the billet 2, record the change value b1 of the rangefinder 18 on the left side of the billet 2 compared to before the movement and the real-time value p1 of the pressure sensor 19, the change value b2 of the rangefinder 18 on the right side of the billet 2 compared to before the movement and the real-time value p2 of the pressure sensor 19. When p1≥e and p2≥e, where e is the pressure set value, and b1 and b2 have not changed within a few seconds, control the horizontal movement system 16 to move away from the billet 2, so that the mechanical probe 17 is adjusted to the initial position.

[0062] F) Control the left and right horizontal telescopic systems 13 to move towards the billet 2, and record the changes f1 and f2 of the left and right displacement detection devices 20 compared to before the movement. When f1 = b1 - c, the left horizontal telescopic system 13 stops moving, and when f2 = b2 - c, the right horizontal telescopic system 13 stops moving.

[0063] G) Continuously spray the narrow surface of the billet 2;

[0064] H) After casting is completed, control the two horizontal telescopic systems 13 on the left and right to move away from the billet 2 and return to the initial position.

[0065] In step E), if |b1-b2|≥k, where k is a system setting value, an alarm will be triggered to remind that the center line of the billet 2 is not aligned, and an inspection will be carried out after casting is completed.

[0066] In addition, in this embodiment, the nozzle 9 can be connected to a pressure and flow detection and control system 21, which is connected to a medium pipe 22. The pressure and flow detection and control system 21 can track and regulate the flow and pressure of the nozzle 9, and the medium pipe 22 provides the nozzle 9 with an energy medium (water and gas, etc.).

[0067] In step G), the pressure and flow rate of each nozzle 9 are adjusted to the preset pressure value P by the pressure and flow detection and control system 21. 设 and the preset value of flow rate V 设 Then, the narrow face of the billet 2 is continuously sprayed. If the pressure P of any nozzle 9... n and traffic V n Greater than or less than (0.9-1.1)P 设 Or (0.9-1.1)V 设 If the pressure or flow rate of nozzle 9 is abnormal, please notify us and check after stopping the machine.

[0068] In the above embodiment, the two ends of the guide post 4 are fixedly installed by the mounting plate 23, the nozzle 9 is at the same height, and the shape of the mounting block 7 corresponds to the shape of the casting billet 2, specifically whether the mounting block 7 has a curvature. Figure 4 As shown, the mounting block 7 of the narrow-face spray device in the arc segment and straightening segment is the same as the arc of the casting machine, while the mounting block of the narrow-face spray device in the horizontal segment is a rectangular block without arc.

[0069] This invention relates to an adaptive control device and method for the secondary cooling nozzles on the edge of a continuous casting machine. It achieves adaptive control of the nozzle distance and angle under varying billet width conditions, ensuring good narrow-face cooling and reducing transverse and longitudinal cracks. Through the lifting system 6 and displacement sensor 14, precise adjustment and control of the nozzle 9 along the height direction of the billet 2 are achieved. Through the transverse movement system 16, rangefinder 18, and mechanical probe 17, precise measurement of the distance between the mechanical probe 17 and the narrow face of the billet 2 is achieved. Furthermore, the measured distances between the left and right mechanical probes 17 and the billet 2 can be used to automatically determine whether the centerline of the billet 2 coincides with the centerline of the continuous casting machine 3. The device also utilizes pressure and... The flow detection and control system 21 enables precise setting of the flow rate and pressure of each nozzle 9, and can automatically determine nozzle 9 blockage or other abnormal conditions by measuring changes in the values. The integrated design of the movable block 8, connecting rod 10 and sleeve 11 enables simultaneous dynamic adjustment of multiple nozzles 9, and the design of the guide rod 12 and sleeve 11 greatly reduces the movement resistance. The different curvature design of the mounting block 7 and the use of the mounting plate 23 allow the entire device to be quickly installed on the fan-shaped sections in different areas, meeting the needs of narrow-face spray cooling in different areas of the casting slab 2. The overall system has a simple structure, low price and strong applicability.

[0070] Finally, it should be noted that the above description is a further detailed explanation of the invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of the invention should be considered within the scope of protection of this invention. The above embodiments are merely representative examples of the invention. Obviously, the invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention should be considered within the scope of protection of this invention.

[0071] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of this specification to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims. Features of various embodiments of this invention may be combined or spliced ​​together in part or in whole, and may be implemented in various different configurations as will be fully understood by those skilled in the art. Embodiments of this invention may be implemented independently of each other or may be implemented together in an interdependent relationship.

[0072] For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and the above structures should all be considered to fall within the protection scope of the present invention.

Claims

1. A control method for an adaptive control device for the secondary cooling nozzle at the edge of a continuous casting machine, characterized in that: The control device includes two spray devices (1), which are symmetrically arranged on both sides of the continuous casting machine (3) with the width center line of the billet (2) as the center. Each spray device (1) includes two vertical guide columns (4), and each guide column (4) is fitted with a sleeve (5). The sleeve (5) is raised and lowered by a lifting system (6). An installation block (7) is connected between the two sleeves (5). The side of the installation block (7) facing the billet (2) is hollow, and the inside is provided with a platen parallel to the installation block (7). The movable block (8) is provided with a plurality of nozzles (9) facing the billet (2). The other side of the movable block (8) is provided with at least two vertical connecting rods (10). Both ends of the connecting rods (10) are sleeved on the guide rods (12) through sleeves (11). One end of the guide rods (12) is fixed on the inner wall of the mounting block (7), and the other end faces the billet (2). The movable block (8) moves back and forth through the horizontal telescopic system (13) provided on the mounting block (7). The lifting system (6) is equipped with a displacement sensor (14) for detecting the displacement of the sleeve (5). The mounting block (7) is equipped with a fixed frame (15). The fixed frame (15) is equipped with a transverse system (16). A mechanical probe (17) is installed on the movable side of the transverse system (16). The mechanical probe (17) moves toward the casting billet (2) through the transverse system (16). The mechanical probe (17) is equipped with a rangefinder (18) and a pressure sensor (19). The horizontal telescopic system (13) is equipped with a displacement detection device (20) for detecting the displacement of the movable block (8). The nozzle (9) is at the same height. The control process includes the following steps: A) When the "start casting" command is received, the continuous casting roller (24) of the continuous casting machine (3) rotates and drives the billet (2) to move. Combined with the steel grade information, the optimal distance c between the nozzle (9) and the end face of the billet (2) is obtained. B) Obtain the casting thickness h of the billet (2), and use the displacement sensor (14) to obtain the height a of the nozzle (9) center line from the lower roller surface. When it is found that a≠h / 2, adjust it through the lifting system (6) so that the height a of the nozzle (9) center line from the lower roller surface is half of the casting thickness h of the billet (2). C) The mechanical probe (17) is adjusted to the initial position by the lateral movement system (16), and the distance between the two paired mechanical probes (17) is measured by the rangefinder (18) to make the distance between them the preset value s; D) Adjust the nozzle (9) to the initial position using the horizontal telescopic system (13), and use the displacement detection device (20) to detect that the distance between the two paired nozzles (9) is s; E) Control the two horizontal movement systems (16) to move towards the billet (2), record the change value b1 of the distance measuring instrument (18) on the left side of the billet (2) compared to before the movement and the real-time value p1 of the pressure sensor (19), the change value b2 of the distance measuring instrument (18) on the right side of the billet (2) compared to before the movement and the real-time value p2 of the pressure sensor (19), when p1≥e and p2≥e, e is the pressure set value, and b1 and b2 have not changed within a few seconds, control the horizontal movement system (16) to move away from the billet (2) so that the mechanical probe (17) is adjusted to the initial position; F) Control the left and right horizontal telescopic systems (13) to move towards the billet (2), and record the changes f1 and f2 of the left and right displacement detection devices (20) compared to before the movement. When f1=b1-c, the left horizontal telescopic system (13) stops moving, and when f2=b2-c, the right horizontal telescopic system (13) stops moving. G) Continuously spray the narrow face of the billet (2); H) After casting is completed, control the two horizontal telescopic systems (13) on the left and right to move away from the billet (2) and return to the initial position.

2. The control method of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine as described in claim 1, characterized in that: The nozzle (9) is connected to a pressure and flow detection and control system (21), and the pressure and flow detection and control system (21) is connected to a medium pipe (22).

3. The control method of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine as described in claim 1, characterized in that: The two ends of the guide post (4) are fixedly installed by the mounting plate (23).

4. The control method of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine as described in claim 1, characterized in that: The shape of the mounting block (7) corresponds to the shape of the casting billet (2).

5. The control method of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine as described in claim 1, characterized in that: The nozzle (9) is connected to a pressure and flow detection and control system (21), which is connected to a medium pipe (22). In step G), the pressure and flow of each nozzle (9) are adjusted to the preset pressure value P by the pressure and flow detection and control system (21). 设 and the preset value of flow rate V 设 Then, the narrow face of the billet (2) is continuously sprayed. If the pressure P of any nozzle (9) is... n and traffic V n Greater than or less than (0.9-1.1)P 设 Or (0.9-1.1)V 设 If the pressure or flow of nozzle (9) is abnormal, remind the user to stop the machine and check for confirmation.

6. The control method of the adaptive control device for the secondary cooling nozzle at the edge of the continuous casting machine as described in claim 1, characterized in that: In step E), if |b1-b2|≥k, where k is a system setting value, an alarm will be triggered to remind that the center line of the billet (2) is not aligned, and an inspection will be carried out after casting.

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