Device and method suitable for rapid cooling of corners of continuous casting billets

Abstract

The invention discloses a device and method suitable for rapid cooling of corners of a continuous casting billet. The device comprises nozzles arranged at four corners of a continuous casting billet, an angle gauge, a rotating rack, a rotating shaft, an air pipe, a water pipe, a transverse moving frame, a water-air mixing device, a fixed bracket, a rotating motor, a connecting bracket and a movable sleeve, a plurality of nozzles are arranged on the transverse moving frame, each nozzle is provided with an angle gauge, the nozzles are fixed on a rotating rack, the tail parts of the nozzles are connected with a water-air mixing device, the water-air mixing device is respectively connected with an air pipe and a water pipe, the rotating rack is fixed on a rotating shaft, a fixed bracket is fixed on the transverse moving frame, and the transverse moving frame is provided with a plurality of nozzles. A rotating motor is installed on the fixing support, an output shaft of the rotating motor and the rotating shaft are connected into a whole, and the transverse moving frame and the movable sleeve are fixed into a whole through a connecting support. The device is simple in overall structure and high in applicability, and corner cracks of the casting blank are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of rapid cooling of corners of continuous casting billets, and in particular relates to a device and method suitable for rapid cooling of corners of continuous casting billets. Background Art

[0002] Continuous casting is the core process of converting molten steel into ingots. In the actual production process, due to the increase of alloy elements, the solidification shrinkage of steel and the changes in internal structure, it is easy to have quality defects such as surface cracks, transverse cracks at corners, surface pits and subcutaneous inclusions. In particular, transverse cracks at corners of Nb-containing steel account for more than 50% of the total defects, becoming the main factor restricting the improvement of ingot quality. The reason is that the external factors of transverse cracks at corners are mainly stress factors (including straightening bending stress, phase change stress, thermal stress, mechanical stress caused by equipment factors, etc.), secondary cooling conditions, crystallizer vibration, crystallizer liquid level fluctuation, protective slag performance and other factors. Among them, secondary cooling conditions are the key factors affecting transverse cracks at the corners of ingots. Since there are three brittle temperature zones in the solidification process of molten steel, if the ingot is bent or straightened in the brittle zone, transverse cracks will occur. If it is bent or straightened at a temperature higher or lower than this temperature range, the transverse cracks can be minimized.

[0003] Since the cooling intensity of the crystallizer is currently regulated as a whole, the temperature of the corners of the ingot cannot be regulated individually. Therefore, it is urgent to develop a device and method for rapid cooling of the corners of the continuous casting ingot, so that the temperature of the corners of the ingot can be quickly reduced, thereby avoiding the three brittle temperature zones and reducing transverse cracks in the corners of the ingot.

[0004] In order to understand the current status of the technology for improving the quality of the corners of continuous casting billets and rapid cooling, a search was conducted on related technologies. Through the search, a total of 3 patents related to the treatment of the corners of continuous casting billets and the prevention of cracks were found, as follows:

[0005] 1. Shanghai Dongzhen Metallurgical Engineering Technology Co., Ltd. has developed an automatic flame cleaning device for the corners of continuous casting billets and its operating method (Cheng Huang, Zhang Yongqiang, Yang Jianpeng. Automatic flame cleaning device for the corners of continuous casting billets and its operating method. China, invention patent, CN201210241681.1.2012.10.10.), which consists of a supporting frame, a trolley track, a cleaning machine trolley, a trolley driving device, a heat insulation protection plate, a cleaning trolley, a cleaning trolley track, a trolley driving device, a cleaning gun, an automatic height adjustment device, a control valve station and a slab correction device. The cleaning trolley travels on the trolley track installed on the supporting frame, and a heat insulation protection plate is provided at the bottom of the cleaning machine trolley. The trolley driving device provides power for the cleaning machine trolley to travel. The cleaning trolley track is fixed on the cleaning trolley, and two cleaning trolleys are symmetrically arranged at both ends of the cleaning trolley track. The trolley driving device drives the cleaning trolley to move back and forth on the cleaning trolley track. The cleaning gun is installed on the automatic height adjustment device. The power supply and energy medium pipelines on the cleaning trolley are controlled by the control valve station. A set of slab correction devices is set on the cleaning machine trolley to correct the cleaning trajectory of the corner of the continuous casting slab during the cleaning process. This invention is mainly used for cleaning after the corner cracks of the casting slab occur, and cannot be used to prevent the corner cracks of the casting slab.

[0006] 2. Shanxi Taigang Stainless Steel Co., Ltd. discloses a method for inspecting micro cracks at the corners of carbon steel continuous casting billets (Zhang Bin, Wang Fuwei, Wang Honghui. A method for inspecting micro cracks at the corners of carbon steel continuous casting billets. China, invention patent, CN201110147648.8.2011.11.02.), which includes the following steps: (1) sampling; (2) sample cutting; (3) pickling the sample. By cutting a sample strip of a certain shape from the corner of a crack-sensitive steel billet and inspecting it after pickling, the distribution of fine cracks at the corners of the billet can be fed back in a timely and accurate manner, and accordingly, the corner defects of the billet that produces cracks can be removed by flame cleaning or grinding, so as to avoid the defective billet from being scrapped after the billet is circulated to the rolling process; this patent is only used for the physical and chemical inspection and analysis of carbon steel corner cracks, and cannot fundamentally avoid the occurrence of billet corner cracks.

[0007] 3. Anhui University of Technology disclosed a method for improving corner cracks and hot delivery cracks of niobium-containing steel ingots by using low-voltage pulse current (Zhu Zhenghai, Wei Li. Method for improving corner cracks and hot delivery cracks of niobium-containing steel ingots by using low-voltage pulse current. China, invention patent, CN201210203022.9.2012.10.03.). The invention is that before the niobium-containing steel ingot enters the straightening zone or after the ingot is cut out of the continuous casting machine, a pulse current is applied to the above-mentioned niobium-containing steel ingot, and the pulse current parameters are: pulse voltage 2~20V, pulse current 30~120A, pulse frequency 15~40Hz; the niobium-containing steel is a niobium-containing low-carbon steel with ω[C]<0.25%, wherein 0.01%≤ω[Nb]≤0.40%. The present invention changes the microstructure of the niobium-containing low-carbon steel ingot by applying low-voltage pulse current, improves the high-temperature mechanical properties of the ingot, and effectively reduces the corner cracks and hot-feed (red-feed) cracks of the ingot. The method of the present invention does not affect normal production, does not require changes to the existing production process, does not require the addition of alloy elements, does not pollute the ingot and equipment, and does not harm personnel. It is an environmentally friendly and safe new technology for reducing ingot defects. However, this method is only for niobium-containing steel and cannot be applied to the prevention and treatment of corner cracks in ingots of other steel grades.

[0008] In summary, it is necessary to invent a device and method suitable for rapid cooling of the corners of continuous casting billets. Summary of the invention

[0009] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to provide a device and method suitable for rapid cooling of the corners of continuous casting billets.

[0010] The technical solution adopted by the present invention is: a device suitable for rapid cooling of the corners of a continuous casting billet, comprising a nozzle, an angle meter, a rotating frame, a rotating shaft, an air pipe, a water pipe, a transverse frame, a water-gas mixing device, a fixed bracket, a rotating motor, a connecting bracket and a movable sleeve arranged at the four corners of the continuous casting billet; each of the nozzles is equipped with an angle meter, the nozzle is fixed on the rotating frame, the tail of the nozzle is connected to the water-gas mixing device, the water-gas mixing device is respectively connected with an air pipe and a water pipe, the rotating frame is fixed on the rotating shaft, the transverse frame is fixed with a fixed bracket, the fixed bracket is equipped with a rotating motor, the output shaft of the rotating motor is connected to the rotating shaft as a whole, and the transverse frame is fixed to the movable sleeve as a whole through the connecting bracket.

[0011] A further preferred structure is that a transverse driving system, a transverse mechanism and a fixed connecting rod are provided on the outer side of the transverse frame, one end of the fixed connecting rod is fixed to the guide column, and the other end is fixed to the transverse driving system, one end of the transverse mechanism is connected to the transverse driving system, and the other end is connected to the transverse frame.

[0012] In a further preferred structure, a displacement sensor is provided on the transverse movement mechanism.

[0013] In a further preferred structure, the two ends of the guide column are respectively fixed to the installation frame of the fan-shaped segment by two locking frames and connecting bolts to fix the guide column and the transverse driving system, the transverse mechanism and the transverse frame.

[0014] In a further preferred structure, the inner diameter of the movable sleeve is the same as the outer diameter of the guide post.

[0015] In a further preferred structure, an encoder is installed on the rotating motor.

[0016] In a further preferred structure, an air pressure and flow regulating valve is installed on the water pipe, and a water pressure and flow regulating valve is installed on the water pipe.

[0017] In a further preferred structure, the rotating frame is fixed on the rotating shaft by a locking ring.

[0018] A method for rapidly cooling the corner of a continuous casting billet, comprising:

[0019] Step 1: The initial distance between the rotating axes of the two matching nozzles above and below the four corners of the continuous casting billet is maintained at S, and they are symmetrically distributed along the center line of the width of the continuous casting billet. In the initial state, the 1# and 3# nozzles are horizontally facing right, and the 2# and 4# nozzles are horizontally facing left. At this time, the reading of the angle meter on the 1# and 3# nozzles is 0°; the reading of the angle meter on the 2# and 4# nozzles is 180°; at this time, the encoder reading of the rotating motor is cleared to zero, and the reading of the displacement sensor is also cleared to zero;

[0020] Step 2: Read the casting width L of the continuous casting billet, and match the injection angle α according to the steel type and the billet width; calculate the distance b that the 1#, 2#, 3# and 4# nozzles need to move toward the center of the continuous casting billet, b = / 2-H / tanα, H is the vertical distance between the rotation center of the nozzle and the thickness center line of the continuous casting billet; simultaneously start the four transverse drive systems and drive the transverse mechanism and the transverse frame to move toward the center of the continuous casting billet, and at the same time, the displacement sensor starts counting and is recorded as c1, c2, c3 and c4 respectively. When c1 = c2 = c3 = c4 = b, the transverse drive system stops moving;

[0021] Step 3: Start four rotating motors at the same time, and their respective encoders start counting; among them, the 1# rotating motor rotates clockwise, and the encoder tracks the rotation angle of the rotating motor, and stops rotating when the rotating motor rotates clockwise at an angle γ1=α; at this time, compare whether the angle α1 of the angle meter is 360°-α, if |360°-α1-α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then the 1# angle meter or encoder has a fault, and check and confirm after stopping; among them, the 2# rotating motor rotates counterclockwise, and the encoder tracks the rotation angle of the rotating motor, and stops rotating when the rotating motor rotates counterclockwise at an angle γ2=α; at this time, compare whether the angle α2 of the angle meter is 180°+α, if |α1-180°-α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then the 2# angle There is a fault in the meter or encoder, and the machine is stopped for inspection and confirmation; the 3# rotating motor rotates counterclockwise, and the encoder tracks the rotation angle of the rotating motor. When the rotating motor rotates counterclockwise at an angle γ3=α, it stops rotating; at this time, the angle α2 of the angle meter is compared to see if it is α. If |α1-α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then there is a fault in the 3# angle meter or encoder, and the machine is stopped for inspection and confirmation; the 4# rotating motor rotates clockwise, and the encoder tracks the rotation angle of the rotating motor. When the rotating motor rotates clockwise at an angle γ4=α, it stops rotating; at this time, the angle α1 of the angle meter is compared to see if it is 180°-α. If |α1-180°+α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then there is a fault in the 4# angle meter or encoder, and the machine is stopped for inspection and confirmation;

[0022] Step 4: When γ1=γ2=γ3=γ4=α, match the water pressure P of each nozzle by steel type and billet section width 水 and flow V 水 , air pressure P 气 and flow V 气 , and adjust and control the water pressure and flow rate as well as the air pressure and flow rate of each nozzle, and record them as P1 水 、V1 水 、P1 气 、V1 气 、P2 水 、V2 水 、P2 气 、V2 气 、P3 水 、V3 水 、P3 气 、V3 气 、P4 水 、V4 水 、P4 气 、V4 气,; When any 1.1P 气 ≤Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too high; when any 1.1P 水 ≤Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of n# nozzle is too high; when any 0.9P 气 ≥Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too low; when any 0.9P 水 ≥Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of the n# nozzle is too low; when any 1.1V 气 ≤Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too high; when any 1.1V 水 ≤Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of n# nozzle is too high; when any 0.9V 气 ≥Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too low; when any 0.9V 水 ≥Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of n# nozzle is too low; until the casting is finished;

[0023] Step 5: Turn off the flow and pressure of water and gas of each nozzle; start the four rotating motors at the same time and rotate them in the opposite direction of step 3 by an angle α to restore each nozzle to its initial state, that is, in the initial state, the 1# and 3# nozzles are horizontal to the right, and the 2# and 4# nozzles are horizontal to the left. At this time, the reading of the angle meter on the 1# and 3# nozzles is 0°; the reading of the angle meter on the 2# and 4# nozzles is 180°. After meeting the above requirements, proceed to step 6;

[0024] Step 6: Start the transverse drive system at the same time and drive the transverse mechanism and the transverse frame to move away from the center of the continuous casting billet until the initial distance between the rotation axes of the two matching nozzles on the left and right is S, and they are symmetrically distributed about the center line of the width of the continuous casting billet, and then end.

[0025] The invention has a simple overall structure, low price, strong applicability, and avoids the occurrence of cracks in the corners of the ingot; the lateral movement of the nozzle in the horizontal direction can be achieved through the lateral movement drive system, the lateral movement mechanism, the guide column and the lateral movement frame, and the precise control of the nozzle position can be achieved through the displacement sensor; the rotation of the nozzle angle can be achieved through the rotating motor, the rotating shaft and the rotating frame, and the precise control of the rotation angle can be achieved through the encoder installed on the rotating motor and the angle meter installed on the nozzle; the rotation angle of the rotating motor can be automatically calculated through the encoder, and the calculated angle is compared with the value of the angle meter, thereby ensuring the correctness and reliability of the nozzle rotation angle; by automatically reading the continuous casting billet width and the theoretical injection angle of the nozzle, and combining the vertical distance between the rotation center of the nozzle and the thickness center line of the continuous casting billet, the required lateral movement distance and rotation angle of the nozzle can be automatically calculated, and unmanned control is achieved; each nozzle can achieve precise control and proportioning of the energy medium through the air pressure and flow regulating valve, the water pressure and flow regulating valve, and can automatically determine whether the operation is normal and reliable by comparing the pressure and flow with the set value, thereby achieving self-determination of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the device of the present invention;

[0027] Figure 2 It is a side view of the device of the present invention.

[0028] In the figure: 1-continuous casting billet; 2-nozzle; 3-angle meter; 4-rotating frame; 5-rotating axis; 6-transverse driving system; 7-locking frame; 8-guide column; 9-mounting frame; 10-connecting bolt; 11-displacement sensor; 12-air pipe; 13-water pipe; 14-transverse mechanism; 15-air pressure and flow regulating valve; 16-water pressure and flow regulating valve; 17-transverse frame; 18-water-gas mixing device; 19-fixed bracket; 20-rotating motor; 21-encoder; 22-fixed connecting rod; 23-connecting bracket; 24-movable sleeve; 25-locking ring. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0030] Embodiment 1:

[0031] like Figure 1 and Figure 2As shown: a device suitable for rapid cooling of the corners of continuous casting billets, including a continuous nozzle 2, an angle meter 3, a rotating frame 4, a rotating shaft 5, a transverse drive system 6, a locking frame 7, a guide column 8, a mounting frame 9, a connecting bolt 10, a displacement sensor 11, an air pipe 12, a water pipe 13, a transverse mechanism 14, an air pressure and flow regulating valve 15, a water pressure and flow regulating valve 16, a transverse frame 17, a water-gas mixing device 18, a fixed bracket 19, a rotating motor 20, an encoder 21, a fixed connecting rod 22, a connecting bracket 23, a movable sleeve 24 and a locking ring 25.

[0032] In order to quickly cool the four corners of the continuous casting billet 1, a nozzle 2 is provided at each of the four corners, and an angle meter 3 is installed on each nozzle 2, which can measure and track the inclination angle of the nozzle 2 in real time; the nozzle 2 is fixed on the rotating frame 4, and the tail of the nozzle 2 is connected to a water-gas mixing device 18, and the main function of the water-gas mixing device 18 is to mix water and gas; the air pipe 12 and the water pipe 13 are respectively connected to the water-gas mixing device 18, and an air pressure and flow regulating valve 15 is installed on the water pipe 12, which is mainly used to monitor and adjust the air pressure and flow of the nozzle 2; a water pressure and flow regulating valve 16 is installed on the water pipe 13, which is mainly used to control the nozzle 2. 2 is used to monitor and adjust the water pressure and flow of the nozzle 2; the rotating frame 4 is fixed to the rotating shaft 5 by a locking ring 25, and a fixed bracket 19 is fixed to the transverse frame 17, and a rotating motor 20 is installed on the fixed bracket 19, and the output shaft of the rotating motor 20 is connected to the rotating shaft 5 as a whole, so that the rotating shaft 5 and the rotating frame 4 and the nozzle 2 fixed on the rotating shaft 5 can be driven to rotate together through the rotation of the rotating motor 20; since an encoder 21 is installed at the back of the rotating motor 20, the rotation angle of the nozzle 2 can be measured and monitored in real time. In the initial state, the nozzle 2 is in a vertical downward state, and the axis of the nozzle 2 is in contact with the water during the rotation process. The angle of the horizontal line is denoted as α; the transverse frame 17 is fixed as a whole with the movable sleeve 24 through the connecting bracket 23. Since the inner diameter of the movable sleeve 24 is the same as the outer diameter of the guide column 8, the transverse frame 17 can move left and right along the guide column 8; a transverse driving system 6, a transverse mechanism 14 and a fixed connecting rod 22 are provided on the outside of the transverse frame 17, wherein one end of the fixed connecting rod 22 is fixed to the guide column 8, and the other end is fixed to the transverse driving system 6, and one end of the transverse mechanism 14 is connected to the transverse driving system 6, and the other end is connected to the transverse frame 17, so that when the transverse driving system 6 is extended or retracted left and right, the transverse frame 17 can be driven by the transverse mechanism 14. The frame 17 and the nozzle 2 and the water-gas mixing device 18 on the transverse frame 17 move left and right, and because the transverse mechanism 14 is provided with a displacement sensor 11, the moving distance of the transverse mechanism 14 can be accurately measured and controlled; at both ends of the guide column 8, the guide column 8 and the transverse drive system 6, the transverse mechanism 14 and the transverse frame 17 are fixed to the mounting frame 9 of the fan-shaped segment by two locking frames 7 and connecting bolts 10 to achieve accurate positioning. During the initial positioning process, the initial distance between the rotation axes of the two matching nozzles 2 on the left and right is S, and they are symmetrically distributed about the center line of the width of the continuous casting billet 1, and the width of the continuous casting billet 1 is L.

[0033] Embodiment 2:

[0034] A method for rapidly cooling a corner of a continuous casting billet, comprising:

[0035] Step 1: After fixing the continuous casting billet 1 angle rapid cooling device on the mounting frame 9 of the fan-shaped segment by using the connecting bolts 10 and the locking frame 7, the initial distance between the rotation axes of the two matching nozzles 2 on the upper and lower sides is kept to be S, and they are symmetrically distributed along the central line of the width of the continuous casting billet 1. In the initial state, the 1# and 3# nozzles 2 are horizontally facing right, and the 2# and 4# nozzles 2 are horizontally facing left. At this time, the reading of the angle meter 3 on the 1# and 3# nozzles 2 is 0°; the reading of the angle meter 3 on the 2# and 4# nozzles 2 is 180°; at this time, the reading of the encoder 21 of the rotating motor 20 is cleared to zero, and the reading of the displacement sensor 11 is also cleared to zero, and then step 2 is entered;

[0036] Step 2: Read the casting width L of the continuous casting billet 1 from the secondary machine, and match the injection angle α (α is the angle between the 3# nozzle and the horizontal line) according to the steel type and the billet width; at this time, calculate the distance b that the 1#, 2#, 3# and 4# nozzles need to move toward the center of the continuous casting billet 1, b = (SL) / 2-H / tanα, H is the vertical distance between the rotation center of the nozzle 2 and the thickness center line of the continuous casting billet 1; at the same time, start the four transverse drive systems 6 and drive the transverse mechanism 14 and the transverse frame 17 to move toward the center of the continuous casting billet 1, and at the same time, the displacement sensor 11 starts counting and is recorded as c1, c2, c3 and c4 respectively. When c1 = c2 = c3 = c4 = b, the transverse drive system 6 stops moving and enters step 3;

[0037] Step 3: Start four rotating motors 20 at the same time, and their respective encoders 21 start counting; wherein the 1# rotating motor 20 rotates clockwise, and the encoder 21 tracks the rotation angle of the rotating motor 20, and stops rotating when the rotating motor 20 rotates clockwise at an angle γ1=α; at this time, compare whether the angle α1 of the angle meter is 360°-α, if |360°-α1-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 1# angle meter or encoder has a fault, and check and confirm after shutdown; wherein the 2# rotating motor 20 rotates counterclockwise, and the encoder 21 tracks the rotation angle of the rotating motor 20, and stops rotating when the rotating motor 20 rotates counterclockwise at an angle γ2=α; at this time, compare whether the angle α2 of the angle meter is 180°+α, if |α1-180°-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 2# angle meter or encoder has a fault Fault, check and confirm after shutdown; wherein the 3# rotating motor 20 rotates counterclockwise, and the rotation angle of the rotating motor 20 is tracked by the encoder 21, and the rotating motor 20 stops rotating when the counterclockwise rotation angle γ3=α; at this time, compare whether the angle α2 of the angle meter is α, if |α1-α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then the 3# angle meter or encoder has a fault, and check and confirm after shutdown; wherein the 4# rotating motor 20 rotates clockwise, and the rotation angle of the rotating motor 20 is tracked by the encoder 21, and the rotating motor 20 stops rotating when the clockwise rotation angle γ4=α of the rotating motor 20; at this time, compare whether the angle α1 of the angle meter is 180°-α, if |α1-180°+α|≥θ, θ is the allowable angle deviation value, and the value range is 1°-5°, then the 4# angle meter or encoder has a fault, and check and confirm after shutdown; when γ1=γ2=γ3=γ4=α, enter step 4;

[0038] Step 4: Match the water pressure P of each nozzle 2 according to the steel type and the billet section width 水 and flow V 水 , air pressure P 气 and flow V 气 The water pressure and flow rate as well as the air pressure and flow rate of each nozzle 2 are regulated and controlled through the air pressure and flow rate regulating valve 15 and the water pressure and flow rate regulating valve 16, and recorded as P1 respectively. 水 、V1 水 、P1 气 、V1 气 、P2 水 、V2 水 、P2 气 、V2 气 、P3 水 、V3 水 、P3 气 、V3 气 、P4水 、V4 水 、P4 气 、V4 气, ; When any 1.1P 气 ≤Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too high; when any 1.1P 水 ≤Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of n# nozzle is too high; when any 0.9P 气 ≥Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too low; when any 0.9P 水 ≥Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of the n# nozzle is too low; when any 1.1V 气 ≤Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too high; when any 1.1V 水 ≤Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of n# nozzle is too high; when any 0.9V 气 ≥Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too low; when any 0.9V 水 ≥Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of the n# nozzle is too low; until the casting is completed, go to step 5;

[0039] Step 5: close the flow and pressure of water and gas of each nozzle 2 through the air pressure and flow regulating valve 15 and the water pressure and flow regulating valve 16; start the four rotary motors 20 at the same time and rotate them in the opposite direction of step 3 by an angle α, so that each nozzle 2 returns to its initial state, that is, in the initial state, the 1# and 3# nozzles 2 are horizontally facing right, and the 2# and 4# nozzles 2 are horizontally facing left. At this time, the reading of the angle meter 3 on the 1# and 3# nozzles 2 is 0°; the reading of the angle meter 3 on the 2# and 4# nozzles 2 is 180°. After meeting the above requirements, proceed to step 6;

[0040] Step 6: Simultaneously start the transverse drive system 6 and drive the transverse mechanism 14 and the transverse frame 17 to move away from the center of the continuous casting billet 1 until the initial distance between the rotation axes of the two matching nozzles 2 on the left and right is S, and they are symmetrically distributed about the center line of the width of the continuous casting billet 1, and then end.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A device suitable for rapid cooling of the corner of a continuous casting billet, characterized in that: The invention comprises nozzles (2) arranged at four corners of a continuous casting billet (1), an angle meter (3), a rotating frame (4), a rotating shaft (5), an air pipe (12), a water pipe (13), a transverse frame (17), a water-gas mixing device (18), a fixed bracket (19), a rotating motor (20), a connecting bracket (23) and a movable sleeve (24); each of the nozzles (2) is provided with an angle meter (3); the nozzles (2) are fixed on the rotating frame (4); the tail of the nozzles (2) is connected to the water-gas mixing device The water-gas mixing device (18) is respectively connected to an air pipe (12) and a water pipe (13); the rotating frame (4) is fixed to a rotating shaft (5); a fixed bracket (19) is fixed to the transverse frame (17); a rotating motor (20) is installed on the fixed bracket (19); an output shaft of the rotating motor (20) is connected to the rotating shaft (5) as a whole; and the transverse frame (17) is fixed to a movable sleeve (24) as a whole via a connecting bracket (23).

2. A device for rapid cooling of corners of continuous casting billets according to claim 1, characterized in that: The outer side of the transverse frame (17) is provided with a transverse driving system (6), a transverse mechanism (14) and a fixed connecting rod (22), one end of the fixed connecting rod (22) is fixed on the guide column (8), and the other end is fixed on the transverse driving system (6), one end of the transverse mechanism (14) is connected to the transverse driving system (6), and the other end is connected to the transverse frame (17).

3. A device for rapid cooling of corners of continuous casting billets according to claim 2, characterized in that: The transverse movement mechanism (14) is provided with a displacement sensor (11).

4. The device for rapid cooling of the corner of a continuous casting billet according to claim 2, characterized in that: The two ends of the guide column (8) are respectively fixed to the installation frame (9) of the fan-shaped segment by two locking frames (7) and connecting bolts (10) to fix the guide column (8) and the transverse driving system (6), the transverse mechanism (14) and the transverse frame (17).

5. The device for rapid cooling of the corner of a continuous casting billet according to claim 2, characterized in that: The inner diameter of the movable sleeve (24) is the same as the outer diameter of the guide column (8).

6. The device for rapid cooling of the corner of a continuous casting billet according to claim 3, characterized in that: An encoder (21) is installed on the rotating motor (20).

7. The device for rapid cooling of the corner of a continuous casting billet according to claim 1, characterized in that: An air pressure and flow regulating valve (15) is installed on the water pipe (12), and a water pressure and flow regulating valve (16) is installed on the water pipe (13).

8. The device for rapid cooling of the corner of a continuous casting billet according to claim 1, characterized in that: The rotating frame (4) is fixed on the rotating shaft (5) via a locking ring (25).

9. The method for rapidly cooling the corner of a continuous casting billet according to claim 6, characterized in that: include Step 1: The initial distance between the rotation axes of the two matching nozzles (2) above and below the four corners of the continuous casting billet (1) is maintained at S, and they are symmetrically distributed about the center line of the width of the continuous casting billet (1). In the initial state, the 1# and 3# nozzles (2) are horizontally facing right, and the 2# and 4# nozzles (2) are horizontally facing left. At this time, the reading of the angle meter (3) on the 1# and 3# nozzles (2) is 0°; the reading of the angle meter (3) on the 2# and 4# nozzles 2 is 180°; at this time, the reading of the encoder (21) of the rotating motor (20) is cleared to zero, and the reading of the displacement sensor (11) is also cleared to zero; Step 2: Read the casting width L of the continuous casting billet (1), and match the injection angle α according to the steel type and the billet width; calculate the distance b that the 1#, 2#, 3# and 4# nozzles need to move toward the center of the continuous casting billet (1), b=(SL) / 2-H / tanα, H is the vertical distance between the rotation center of the nozzle (2) and the thickness center line of the continuous casting billet (1); simultaneously start the four transverse drive systems (6) and drive the transverse mechanism (14) and the transverse frame (17) to move toward the center of the continuous casting billet (1), and at the same time, the displacement sensor (11) starts counting and records them as c1, c2, c3 and c4 respectively. When c1=c2=c3=c4=b, the transverse drive system (6) stops moving; Step 3: The four rotating motors (20) are started simultaneously, and their respective encoders (21) start counting; wherein the 1# rotating motor (20) rotates clockwise, and the rotating angle of the rotating motor (20) is tracked by the encoder (21), and the rotating motor (20) stops rotating when the clockwise rotating angle γ1=α; at this time, the angle α1 of the inclinometer (3) is compared to see whether it is 360°-α. If |360°-α1-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then The 1# angle meter (3) or the encoder (21) is faulty, and the machine is stopped for inspection and confirmation; the 2# rotating motor (20) rotates counterclockwise, and the encoder (21) tracks the rotation angle of the rotating motor (20), and the rotating motor (20) stops rotating when the counterclockwise rotation angle γ2=α; at this time, the angle α2 of the angle meter (3) is compared to see whether it is 180°+α. If |α1-180°-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 2# angle meter (3) is faulty. ) or the encoder (21) is faulty, and the machine is stopped for inspection and confirmation; wherein the 3# rotating motor (20) rotates counterclockwise, and the rotating angle of the rotating motor (20) is tracked by the encoder (21), and the rotating motor (20) stops rotating when the counterclockwise rotation angle γ3=α; at this time, the angle α2 of the angle meter (3) is compared to see whether it is α, and if |α1-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 3# angle meter (3) or the encoder (21) is faulty, and the machine is stopped for inspection and confirmation; wherein the 3# rotating motor (20) rotates counterclockwise, and the rotating angle γ3=α is tracked by the encoder (21), and the rotating motor (20) stops rotating when the counterclockwise rotation angle γ3=α; at this time, the angle α2 of the angle meter (3) is compared to see whether it is α, and if |α1-α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 3# angle meter (3) or the encoder (21) is faulty, and the machine is stopped for inspection and confirmation; After the machine is checked and confirmed; wherein the 4# rotating motor (20) rotates clockwise, and the rotating angle of the rotating motor (20) is tracked by the encoder (21), and the rotating motor (20) stops rotating when the clockwise rotation angle γ4=α; at this time, the angle α1 of the angle meter (3) is compared to see whether it is 180°-α, if |α1-180°+α|≥θ, θ is the angle allowable deviation value, and the value range is 1°-5°, then the 4# angle meter (3) or the encoder (21) has a fault, and the machine is stopped for inspection and confirmation; Step 4: When γ1=γ2=γ3=γ4=α, match the water pressure P of each nozzle (2) by the steel type and the width of the ingot section. 水 and flow V 水 , air pressure P 气 and flow V 气 , and adjust and control the water pressure and flow rate as well as the air pressure and flow rate of each nozzle (2), and record them as P1 respectively 水 、V1 水 、P1 气 、V1 气 、P2 水 、V2 水 、P2 气 、V2 气 、P3 水 、V3 水 、P3 气 、V3 气 、P4 水 、V4 水 、P4 气 、V4 气, ; When any 1.1P 气 ≤Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too high; when any 1.1P 水 ≤Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of n# nozzle is too high; when any 0.9P 气 ≥Pn 气 , n is 1, 2, 3, 4, then the n# nozzle pressure is too low; when any 0.9P 水 ≥Pn 水 , the value of n is 1, 2, 3, 4, then the water pressure of the n# nozzle is too low; when any 1.1V 气 ≤Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too high; when any 1.1V 水 ≤Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of n# nozzle is too high; when any 0.9V 气 ≥Vn 气 , n is 1, 2, 3, 4, then the gas flow of the n# nozzle is too low; when any 0.9V 水 ≥Vn 水 , the value of n is 1, 2, 3, 4, then the water flow of n# nozzle is too low; until the casting is finished; Step 5: close the flow and pressure of water and gas of each nozzle (2); simultaneously start the four rotating motors (20) to rotate in the opposite direction of step 3 by an angle α, so that each nozzle (2) returns to the initial state, that is, in the initial state, the 1# and 3# nozzles (2) are horizontally facing right, and the 2# and 4# nozzles (2) are horizontally facing left. At this time, the reading of the angle meter (3) on the 1# and 3# nozzles (2) is 0°; the reading of the angle meter (3) on the 2# and 4# nozzles (2) is 180°. After the above requirements are met, proceed to step 6; Step 6: Simultaneously start the transverse drive system (6) and drive the transverse mechanism (14) and the transverse frame (17) to move away from the center of the continuous casting billet (1) until the initial distance between the rotation axes of the two matching nozzles (2) on the left and right is S, and they are symmetrically distributed about the center line of the width of the continuous casting billet (1), and then end.

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