A fully automatic cutting control method for a vertical continuous casting cutting machine

Abstract

The present invention belongs to the technical field of automatic control of continuous casting machines in steel plants. The specific technical solution is: a fully automatic cutting control method for a vertical continuous casting cutting machine, a high-performance PLC is set, and a slab cutting speed mathematical model is preset. The mathematical model is based on information such as the composition and organization mechanism, density, hardness, billet thickness, and billet width of the slab, and analyzes and calculates the first cutting speed of the slab, namely the cutting speed V1. The cutting speed changes at each stage of the slab cutting process are based on the first cutting speed V1 as the reference value. In the high-performance PLC, the cutting speed is automatically adjusted by the software program to realize fully automatic cutting control of the slab. This method eliminates the traditional method of manually adjusting the cutting speed through a potentiometer, and adopts software to automatically adjust the cutting speed, which completely liberates the operator from the tense work. At the same time, it greatly improves the cross-sectional quality of the slab cutting seam, reduces the dielectric loss, and improves production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control of continuous casting machines in steel plants, and in particular relates to a full-automatic cutting control method applied to a vertical continuous casting cutting machine. Background Art

[0002] The vertical continuous casting cutting machine system consists of a cutting gun, slab sizing wheels, a cutting trolley, trolley tracks, a drive unit, and limit switches. A clamping arm secures the trolley to the slab during the cutting process, allowing it to descend synchronously with the slab to ensure a straight cut. After cutting is complete, the trolley, driven by a motor and a reducer, rapidly ascends along the toothed vertical track to its zero position.

[0003] Two cutting guns are mounted on the cutting carriage: one main cutting gun and the other auxiliary cutting gun. During cutting, the main and auxiliary cutting guns simultaneously cut the stainless steel slab from both sides of the vertical continuous casting process. A starting stop plate of a certain width is installed on the cutting gun track near the edges of the stainless steel slab on both sides. A proximity switch, acting as a starting limit switch, is installed on each of the two cutting gun brackets, synchronizing the movement of the cutting guns. Furthermore, a proximity switch, acting as a contact switch, is installed on one of the two cutting guns, while a stop plate, acting as a contact stop plate, is installed on the other. During cutting, the two cutting guns move toward each other. When the two cutting guns approach a certain distance, the contact switch approaches the contact stop plate, indicating that the slab is about to be cut. At this point, the contact switch emits a contact signal.

[0004] A slab receiving trolley is arranged under the slab. When the slab is about to be cut, it is necessary to judge whether the slab receiving trolley has caught the slab. If the slab receiving trolley has caught the slab being cut, the slab can be cut. Otherwise, the cutting must be stopped to prevent the cut slab from damaging the slab receiving trolley.

[0005] Currently, the cutting gun speed is controlled as follows: Before each cut, the operator, based on experience, adjusts the potentiometer on the console to a specific position, effectively presetting the speed. At the start of the cut, the operator adjusts the potentiometer to half the preset speed, fine-tuning the speed to create a cut. After the cut is complete, the operator continuously adjusts the potentiometer until the cut is complete. Clearly, the cutting gun speed is constantly controlled manually throughout the slab cutting process. This manual cutting control method results in uneven slab cuts, high dielectric loss, and low production efficiency. Furthermore, the operator experiences significant mental stress and labor intensity during the cutting process. Summary of the Invention

[0006] In response to the technical drawbacks of the current manual cutting control of vertical continuous casting cutting machines, such as uneven slab cut sections, large dielectric loss, and low production efficiency, the present invention provides a fully automatic cutting control device and control method for a vertical continuous casting cutting machine. This method eliminates the traditional method of manually adjusting the cutting speed through a potentiometer and adopts software to automatically adjust the cutting speed, greatly reducing the labor intensity of workers.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fully automatic cutting control method for a vertical continuous casting and cutting machine, by setting a high-performance PLC and a touch screen in the continuous casting and cutting machine, the high-performance PLC accepts information such as the current casting steel type, billet thickness, billet width, number of cutting blocks and fixed length of each block manually input from the touch screen.

[0008] A mathematical model of slab cutting speed is preset in the high-performance PLC. This mathematical model is based on the slab composition and organization mechanism, density, hardness and other physical properties (different steel grades correspond to different composition and organization mechanisms, density and hardness and other physical properties), as well as information such as billet thickness and billet width. It analyzes and calculates the first slab cutting speed, namely the cutting speed V1. The cutting speed changes at each stage of the slab cutting process are based on the first cutting speed V1 as the benchmark value.

[0009] The high-performance PLC is responsible for collecting on-site cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab length measuring wheel encoder signals, slab receiving trolley receiving slab signals, slab cutting signals, etc.

[0010] The high-performance PLC performs logical interlocking operations based on the collected cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab fixed length measuring wheel encoder signals, etc., and outputs control signals to control the actions of equipment such as the cutting gun, cutting trolley, clamping arm, and cutting flame switch. In the event of a fault, the high-performance PLC also outputs sound and light alarm signals to prompt production operators to perform manual emergency processing.

[0011] In a high-performance PLC, the software program automatically adjusts the cutting speed to achieve fully automatic cutting control of the slab. The specific method is as follows:

[0012] (1) The mathematical model of slab cutting speed is based on information such as steel type, billet thickness, billet width, number of cutting blocks and fixed length of each block, and the slab cutting speed V1 is analyzed and calculated.

[0013] (2) Collect the on-site cutting limit switch signal, the encounter switch signal, the cutting gun encoder signal, the cutting trolley encoder signal, the slab fixed length measuring wheel encoder signal, the slab receiving trolley receiving slab signal, the slab cutting signal and other signals.

[0014] (3) According to the signal of the encoder of the slab length measuring wheel, determine whether the length of the current slab has reached the current planned length. If the length of the current slab has not reached the current planned length, continue to wait; if the length of the current slab has reached the current planned length, proceed to the next step.

[0015] (4) The main cutting gun and the auxiliary cutting gun advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun have not reached the starting cutting baffle, they continue to advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun reach the starting cutting baffle, the high-performance PLC will receive the starting cutting signal, and the main cutting gun and the auxiliary cutting gun will automatically start the cutting flame and start cutting at the cutting speed V1, so as to cut holes on both sides of the slab at the same time.

[0016] (5) When the main cutting gun and the auxiliary cutting gun are cutting at the cutting speed V1, it is determined whether the cutting signal disappears. If the cutting signal has not disappeared, it means that no openings have been made on both sides of the slab. At this time, the main cutting gun and the auxiliary cutting gun continue to cut at the cutting speed V1; if the cutting signal disappears, it means that openings have been made on both sides of the slab, and the next step is carried out.

[0017] (6) The main cutting gun and the auxiliary cutting gun cut at the second cutting speed V2, which is twice the speed of V1 (V2 = 2V1) for 2 seconds, and then proceed to the next step.

[0018] (7) The main cutting gun and the auxiliary cutting gun cut at the third cutting speed V3, which is 3 times the speed of V1 (V3 = 3V1) for 2 seconds, and then proceed to the next step.

[0019] (8) The main cutting gun and the auxiliary cutting gun cut at the 4th cutting speed V4, which is 4 times the speed of V1 (V4 = 4V1) for 2 seconds, and then proceed to the next step.

[0020] (9) The main cutting gun and the auxiliary cutting gun cut at the fifth cutting speed V5, which is 5 times the speed of V1 (V5 = 5V1) for 2 seconds, and then proceed to the next step.

[0021] (10) The main cutting gun and the auxiliary cutting gun continue cutting at the 6th cutting speed V6, which is 6 times the speed of V1 (V6=6V1). While the main cutting gun and the auxiliary cutting gun are cutting at the 6th cutting speed V6, it is determined whether the cutting trolley has reached the limit position. If the cutting trolley has reached the limit position, the main cutting gun is turned off and quickly returns to zero position, and the casting and other related systems are stopped. At the same time, an audible and visual alarm is issued to prompt the production operator to perform manual emergency treatment; if the cutting trolley has not reached the limit position, the next step is carried out.

[0022] (11) Determine whether the slab is about to be cut, that is, determine whether the main cutting gun and the auxiliary cutting gun meet, that is, determine whether the meeting switch sends a meeting signal. If the main cutting gun and the auxiliary cutting gun do not meet, the main cutting gun and the auxiliary cutting gun continue to cut at the 6th speed V6; if the main cutting gun and the auxiliary cutting gun meet, the auxiliary cutting gun turns off the fire and quickly returns to zero position, and the main cutting gun continues to cut at the 6th speed V6 and proceeds to the next step.

[0023] (12) Determine whether there is a signal that the trolley is receiving the slab. If there is no signal that the trolley is receiving the slab, the main cutting gun will be turned off and quickly returned to zero position, and the pouring and other related systems will be stopped. At the same time, an audible and visual alarm will be issued to prompt the production operator to perform manual emergency treatment. If there is a signal that the trolley is receiving the slab, the main cutting gun will continue cutting at the 6th speed V6 and proceed to the next step.

[0024] (13) Is there a slab cutting signal? If there is no slab cutting signal, the main cutting gun continues cutting at the 6th speed V6; if there is a slab cutting signal, it means that the slab has been cut, that is, the slab cutting task of the planned fixed length is completed.

[0025] Then, cut the next slab in the same way as above, and repeat this cycle until all the slabs of the planned fixed length for this casting are cut.

[0026] For the next casting, the slab cutting speed V1 needs to be recalculated by the slab cutting speed mathematical model based on the information of the steel type, billet thickness, billet width, number of cutting blocks and fixed length of each block for the next casting.

[0027] Except for the information of the current casting, steel type, billet thickness, billet width, number of cutting pieces and fixed length of each piece, which are manually input into the high-performance PLC through the touch screen, all other processes are completed automatically by the high-performance PLC.

[0028] Compared with the prior art, the specific beneficial effects of the present invention are embodied in that: the present invention eliminates the traditional method of manually adjusting the cutting speed through a potentiometer, and adopts software to automatically adjust the cutting speed, completely liberating the operator from the stressful work. At the same time, it greatly improves the cross-sectional quality of the slab cut seam, reduces the dielectric loss, and improves the production efficiency. The cross-sectional quality of the slab cut seam produced is smooth, the dielectric loss is small, the production efficiency is high, and the work intensity of the operator is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a diagram of the fully automatic cutting control device of the vertical continuous casting cutting machine.

[0030] Figure 2 This is a flow chart of the fully automatic cutting control method for a vertical continuous casting cutting machine. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Example 1

[0033] A fully automatic cutting control method for a vertical continuous casting and cutting machine is provided. The method is configured with a Siemens high-performance S7-300 series PLC (CPU319) and a touch screen MP277. Production operators use the MP277 to input information such as the current pouring stainless steel grade (2Cr13), billet thickness (200 mm), billet width (1200 mm), number of slabs to be cut (10), and the fixed length of each slab (the fixed lengths of the 10 slabs are 10,000 mm, 11,000 mm, 10,600 mm, 10,800 mm, 9,000 mm, 9,500 mm, 10,800 mm, 10,300 mm, 9,600 mm, and 10,200 mm, respectively) into the Siemens high-performance S7-300 series PLC (CPU319).

[0034] A mathematical model of slab cutting speed is preset in the high-performance S7-300 series PLC (CPU319). This mathematical model calculates the first slab cutting speed, i.e., the cutting speed V1, based on information analysis such as the slab composition and organizational mechanism, density, hardness, and other physical properties (different steel grades correspond to different composition and organizational mechanisms, density, hardness, and other physical properties), billet thickness, and billet width. The cutting speed changes at each stage of the slab cutting process are based on the first cutting speed V1 as the benchmark value.

[0035] The high-performance S7-300 series PLC (CPU319) is responsible for collecting on-site cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab length measuring wheel encoder signals, slab receiving trolley receiving slab signals, slab cutting signals, etc.

[0036] The high-performance S7-300 series PLC (CPU319) performs logical interlocking operations based on the collected cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab fixed length measuring wheel encoder signals, etc., and outputs control signals to control the actions of equipment such as the cutting gun, cutting trolley, clamping arm, and cutting flame switch. In the event of a fault, the high-performance S7-300 series PLC (CPU319) also outputs sound and light alarm signals to prompt production operators to perform manual emergency processing.

[0037] In the high-performance S7-300 series PLC (CPU319), the software program automatically adjusts the cutting speed to achieve fully automatic cutting control of the slab. The specific process is as follows:

[0038] (1) The mathematical model of slab cutting speed is based on the information of the current casting stainless steel grade 2Cr13, billet thickness 200 mm, billet width 1200 mm, number of cutting blocks 10 and fixed length of each block (the fixed lengths of the 10 slabs are 10000 mm, 11000 mm, 10600 mm, 10800 mm, 9000 mm, 9500 mm, 10800 mm, 10300 mm, 9600 mm and 10200 mm respectively). The slab cutting speed V1 = 120 mm / M is analyzed and calculated.

[0039] (2) Collect the on-site cutting limit switch signal, the encounter switch signal, the cutting gun encoder signal, the cutting trolley encoder signal, the slab fixed length measuring wheel encoder signal, the slab receiving trolley receiving slab signal, the slab cutting signal and other signals.

[0040] (3) According to the signal of the encoder of the slab length measuring wheel, determine whether the length of the current slab reaches the planned length of the first slab, 10,000 mm. If the length of the current slab does not reach the planned length of the first slab, 10,000 mm, wait; if the length of the current slab reaches the planned length of the first slab, 10,000 mm, proceed to the next step.

[0041] (4) The main cutting gun and the auxiliary cutting gun advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun have not reached the starting cutting baffle, they will continue to advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun reach the starting cutting baffle, the high-performance PLC will receive the starting cutting signal, and the main cutting gun and the auxiliary cutting gun will automatically start the cutting flame and start cutting at a cutting speed of V1 = 120 mm / M, so as to cut holes on both sides of the slab at the same time.

[0042] (5) When the main cutting gun and the auxiliary cutting gun are cutting at a cutting speed of V1 = 120 mm / M, it is determined whether the cutting signal disappears. If the cutting signal has not disappeared, it means that no openings have been made on both sides of the slab. At this time, the main cutting gun and the auxiliary cutting gun continue cutting at a cutting speed of V1 = 120 mm / M. If the cutting signal disappears, it means that openings have been made on both sides of the slab, and the next step is carried out.

[0043] (6) The main cutting gun and the auxiliary cutting gun cut at the second cutting speed V2, which is twice the speed of V1 (V2 = 240mm / M), for 2 seconds, and then proceed to the next step.

[0044] (7) The main cutting gun and the auxiliary cutting gun cut at the third cutting speed V3, which is 3 times the speed of V1 (V3 = 360 mm / M), for 2 seconds, and then proceed to the next step.

[0045] (8) The main cutting gun and the auxiliary cutting gun cut at the 4th cutting speed V4, which is 4 times the speed of V1 (V4 = 480mm / M), for 2 seconds, and then proceed to the next step.

[0046] (9) The main cutting gun and the auxiliary cutting gun cut at the fifth cutting speed V5, which is 5 times the speed of V1 (V5 = 600mm / M), for 2 seconds, and then proceed to the next step.

[0047] (10) The main cutting gun and the auxiliary cutting gun continue cutting at the 6th cutting speed V6, which is 6 times the speed of V1 (V6 = 720mm / M). While the main cutting gun and the auxiliary cutting gun are cutting at the 6th cutting speed V6, it is determined whether the cutting trolley has reached the limit position of 1800 mm when it descends. If the cutting trolley has reached the limit position of 1800 mm, the main cutting gun is turned off and quickly returns to zero position, and the casting and other related systems are stopped. At the same time, an audible and visual alarm is issued to prompt the production operator to perform manual emergency treatment. If the cutting trolley has not reached the limit position of 1800 mm when it descends, proceed to the next step.

[0048] (11) Determine whether the encounter switch sends an encounter signal. If the main cutting gun and the auxiliary cutting gun do not encounter each other, the main cutting gun and the auxiliary cutting gun continue cutting at the 6th speed V6; if the main cutting gun and the auxiliary cutting gun encounter each other, the auxiliary cutting gun turns off the fire and quickly returns to zero position, and the main cutting gun continues cutting at the 6th speed V6 and proceeds to the next step.

[0049] (12) Determine whether there is a signal that the trolley is receiving the slab. If there is no signal that the trolley is receiving the slab, the main cutting gun will be turned off and quickly returned to zero position, and the pouring and other related systems will be stopped. At the same time, an audible and visual alarm will be issued to prompt the production operator to perform manual emergency treatment. If there is a signal that the trolley is receiving the slab, the main cutting gun will continue cutting at the 6th speed V6 and proceed to the next step.

[0050] (13) Is there a slab cutting signal? If there is no slab cutting signal, the main cutting gun continues cutting at the 6th speed V6; if there is a slab cutting signal, it means that the first slab has been cut, that is, the cutting task of the first planned fixed-length slab is completed.

[0051] Then, the next slab is cut in the same way as above, and the process is repeated until all 10 slabs of the planned fixed length are cut.

[0052] Example 2

[0053] Equipped with a high-performance Siemens S7-300 series PLC (CPU319) and an MP277 touch screen, production operators use the MP277 to input information such as the current pouring stainless steel grade (0Cr18Ni9), billet thickness (210mm), billet width (1100mm), number of slabs to be cut (15), and the cut length of each slab (the cut lengths of the 15 slabs are 11000mm, 9800mm, 10300mm, 10500mm, 9800mm, 9600mm, 10300mm, 10200mm, 9800mm, 10600mm, 10200mm, 9700mm, 9900mm, 9600mm, and 9400mm).

[0054] A mathematical model of slab cutting speed is preset in the high-performance S7-300 series PLC (CPU319). This mathematical model is based on information such as the slab composition and organization mechanism, density, hardness and other physical properties (different steel grades correspond to different composition and organization mechanisms and density, hardness and other physical properties), slab thickness, slab width, etc., and analyzes and calculates the first slab cutting speed, i.e., the cutting speed V1. The cutting speed changes at each stage of the slab cutting process are based on the first cutting speed V1 as the benchmark value.

[0055] The high-performance S7-300 series PLC (CPU319) is responsible for collecting on-site cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab length measuring wheel encoder signals, slab receiving trolley receiving slab signals, slab cutting signals, etc.

[0056] The high-performance S7-300 series PLC (CPU319) performs logical interlocking operations based on the collected cutting limit switch signals, meeting switch signals, cutting gun encoder signals, cutting trolley encoder signals, slab fixed length measuring wheel encoder signals, etc., and outputs control signals to control the actions of equipment such as the cutting gun, cutting trolley, clamping arm, and cutting flame switch. In the event of a fault, the high-performance S7-300 series PLC (CPU319) also outputs sound and light alarm signals to prompt production operators to perform manual emergency processing.

[0057] In the high-performance S7-300 series PLC (CPU319), the software program automatically adjusts the cutting speed to achieve fully automatic cutting control of the slab. The specific process is as follows:

[0058] (1) The mathematical model of slab cutting speed is based on the information of the current casting stainless steel grade 0Cr18Ni9, billet thickness 210 mm, billet width 1100 mm, number of cutting blocks 15 and fixed length of each block (the fixed lengths of the 15 slabs are 11000 mm, 9800 mm, 10300 mm, 10500 mm, 9800 mm, 9600 mm, 10300 mm, 10200 mm, 9800 mm, 10600 mm, 10200 mm, 9700 mm, 9900 mm, 9600 mm and 9400 mm respectively). The slab cutting speed V1 = 110 mm / M is analyzed and calculated.

[0059] (2) Collect the on-site cutting limit switch signal, the encounter switch signal, the cutting gun encoder signal, the cutting trolley encoder signal, the slab fixed length measuring wheel encoder signal, the slab receiving trolley receiving slab signal, the slab cutting signal and other signals.

[0060] (3) According to the signal of the encoder of the slab length measuring wheel, determine whether the length of the current slab reaches the planned length of the first slab, 11000 mm. If the length of the current slab does not reach the planned length of the first slab, 11000 mm, wait; if the length of the current slab reaches the planned length of the first slab, 11000 mm, proceed to the next step.

[0061] (4) The main cutting gun and the auxiliary cutting gun advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun have not reached the starting cutting baffle, they will continue to advance towards the starting cutting baffle at full speed. If the main cutting gun and the auxiliary cutting gun reach the starting cutting baffle, the high-performance PLC will receive the starting cutting signal, and the main cutting gun and the auxiliary cutting gun will automatically start the cutting flame and start cutting at a cutting speed of V1 = 110 mm / M, so as to cut holes on both sides of the slab at the same time.

[0062] (5) When the main cutting gun and the auxiliary cutting gun are cutting at a cutting speed of V1 = 110 mm / M, it is determined whether the cutting signal disappears. If the cutting signal has not disappeared, it means that no openings have been made on both sides of the slab. At this time, the main cutting gun and the auxiliary cutting gun continue cutting at a cutting speed of V1 = 110 mm / M. If the cutting signal disappears, it means that openings have been made on both sides of the slab, and the next step is carried out.

[0063] (6) The main cutting gun and the auxiliary cutting gun cut at the second cutting speed V2, which is twice the speed of V1 (V2 = 220mm / M), for 2 seconds, and then proceed to the next step.

[0064] (7) The main cutting gun and the auxiliary cutting gun cut at the third cutting speed V3, which is 3 times the speed of V1 (V3 = 330 mm / M), for 2 seconds, and then proceed to the next step.

[0065] (8) The main cutting gun and the auxiliary cutting gun cut at the 4th cutting speed V4, which is 4 times the speed of V1 (V4 = 440mm / M), for 2 seconds, and then proceed to the next step.

[0066] (9) The main cutting gun and the auxiliary cutting gun cut at the fifth cutting speed V5, which is 5 times the speed of V1 (V5 = 550mm / M), for 2 seconds, and then proceed to the next step.

[0067] (10) The main cutting gun and the auxiliary cutting gun continue cutting at the 6th cutting speed V6, which is 6 times the speed of V1 (V6 = 660mm / M). While the main cutting gun and the auxiliary cutting gun are cutting at the 6th cutting speed V6, it is determined whether the cutting trolley has reached the limit position of 1800 mm when it descends. If the cutting trolley has reached the limit position of 1800 mm, the main cutting gun is turned off and quickly returns to zero position, and the casting and other related systems are stopped. At the same time, an audible and visual alarm is issued to prompt the production operator to perform manual emergency treatment. If the cutting trolley has not reached the limit position of 1800 mm when it descends, proceed to the next step.

[0068] (11) Determine whether the encounter switch sends an encounter signal. If the main cutting gun and the auxiliary cutting gun do not encounter each other, the main cutting gun and the auxiliary cutting gun continue cutting at the 6th speed V6; if the main cutting gun and the auxiliary cutting gun encounter each other, the auxiliary cutting gun turns off the fire and quickly returns to zero position, and the main cutting gun continues cutting at the 6th speed V6 and proceeds to the next step.

[0069] (12) Determine whether there is a signal that the trolley is receiving the slab. If there is no signal that the trolley is receiving the slab, the main cutting gun will be turned off and quickly returned to zero position, and the pouring and other related systems will be stopped. At the same time, an audible and visual alarm will be issued to prompt the production operator to perform manual emergency treatment. If there is a signal that the trolley is receiving the slab, the main cutting gun will continue cutting at the 6th speed V6 and proceed to the next step.

[0070] (13) Is there a slab cutting signal? If there is no slab cutting signal, the main cutting gun continues cutting at the 6th speed V6; if there is a slab cutting signal, it means that the first slab has been cut, that is, the cutting task of the first planned slab is completed. Then, the next slab is cut in the same way as above. This cycle is repeated until all 15 planned slabs are cut.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A fully automatic cutting control method for a vertical continuous casting cutting machine, characterized in that: The specific steps are as follows:

1. Configure a PLC in the vertical continuous casting and cutting machine, preset a mathematical model of slab cutting speed in the PLC, and analyze and calculate the slab cutting speed V1 based on the mathematical model; 2. Collect the on-site cutting limit switch signal, the encounter switch signal, the cutting gun encoder signal, the cutting trolley encoder signal, the slab length measuring wheel encoder signal, the slab receiving trolley receiving slab signal and the slab cutting signal; 3. According to the signal from the encoder of the slab length measuring wheel, it is judged whether the length of the current slab has reached the current planned length. If the length of the current slab has not reached the current planned length, it will continue to wait. If the length of the current slab has reached the current planned length, the main cutting gun and the auxiliary cutting gun will advance towards the cutting baffle at full speed.

4. If the main cutting gun and auxiliary cutting gun have not reached the cutting baffle, they will continue to advance towards the cutting baffle at full speed. If the main cutting gun and auxiliary cutting gun have reached the cutting baffle, the PLC will receive the cutting start signal, and the main cutting gun and auxiliary cutting gun will automatically start cutting flames and start cutting at the cutting speed V1, so as to cut holes on both sides of the slab at the same time.

5. While the main cutting gun and the auxiliary cutting gun are cutting at the cutting speed V1, it is determined whether the cutting start signal disappears. If the cutting start signal has not disappeared, it means that the two sides of the slab have not been cut yet, and the main cutting gun and the auxiliary cutting gun continue cutting at the cutting speed V1. If the cutting start signal disappears, it means that the two sides of the slab have been cut, and the next step is carried out.

6. Both the main cutting gun and the auxiliary cutting gun cut at 2 times the speed of V1 for 2 seconds; 7. Both the main cutting gun and the auxiliary cutting gun cut at 3 times the speed of V1 for 2 seconds; 8. The auxiliary cutting gun cuts at 4 times the speed of V1 for 2 seconds; 9. Both the main cutting gun and the auxiliary cutting gun cut at 5 times the speed of V1 for 2 seconds; 10. Both the main cutting gun and the auxiliary cutting gun continue cutting at a speed of 6 times V1, and at the same time determine whether the cutting trolley has reached the limit position. If the cutting trolley reaches the limit position, the main cutting gun will be turned off and quickly return to zero position, and the pouring system will be stopped. At the same time, an audible and visual alarm will be issued to prompt the production operator to perform manual emergency treatment; If the cutting trolley does not reach the limit position when it moves downward, it is determined whether the encounter switch sends an encounter signal; 11. If the main cutting gun and the auxiliary cutting gun have not met, the main cutting gun will continue cutting at a speed of 6 times V1; if the main cutting gun and the auxiliary cutting gun have met, the auxiliary cutting gun will be turned off and quickly returned to zero position, and the main cutting gun will continue cutting at a speed of 6 times V1, and it will be determined whether there is a signal from the receiving carriage to receive the slab; 12. If the signal from the receiving trolley to receive the slab is not received, the main cutting gun and the auxiliary cutting gun will be turned off and quickly returned to zero position, and the casting-related systems will be stopped in parallel. At the same time, an audible and visual alarm will be issued to prompt the production operator to perform manual emergency processing; if the signal from the receiving trolley to receive the slab is received, the main cutting gun will continue cutting at a speed of 6 times V1 and determine whether the slab cutting signal has been received; 13. If the slab cutting signal is not received, the main cutting gun continues cutting at a speed of 6 times V1; if the slab cutting signal is received, it means that the slab has been cut, that is, the slab cutting task of the planned fixed length has been completed.

2. A fully automatic cutting control method for a vertical continuous casting and cutting machine according to claim 1, characterized in that: The mathematical model of slab cutting speed calculates the slab cutting speed V1 based on the analysis of steel type, slab thickness, slab width, number of cutting blocks and the fixed length of each slab.

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