Casting blank cutting system and method of multi-section continuous casting machine

Abstract

The casting blank cutting system of the multi-section continuous casting machine comprises a flame cutting machine and a supporting roller structure which is arranged below the flame cutting machine and used for supporting a casting blank, the supporting roller structure is a fixed cantilever roller, and the fixed cantilever roller comprises a water cooling stand column, a mandrel, a chain wheel system and a base roller. The mandrel is rotatably arranged at the two ends of the top of the water-cooling stand column and extends out, the chain wheel system is arranged at one end of the mandrel, and the base roller is arranged at the other end of the mandrel to form a cantilever roller structure. The outer end of the base roller is provided with a detachable lengthened roller connecting structure; and an inclined slag baffle is arranged on one side of the water-cooling stand column and below the base roller. The cantilever roller is designed to be a combination of a base roller and a connecting roller, the connecting rollers with different lengths can be replaced according to cutting tracks of different sections, the contact width of a casting blank and a roller set can be increased, the casting blank runs more stably, and the cutting tracks can be effectively avoided. And the most reasonable cutting avoiding route is realized by adopting a control program of flame cutting machine cart walking and cutting gun walking.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting blank cutting, in particular to a casting blank cutting system and method of a multi-section continuous casting machine. BACKGROUND

[0002] In order to continuously improve the production line efficiency, the continuous casting machine capable of producing various section casting blanks is adopted by more and more designers and users. Since the shapes of the casting blanks are various and the sizes are greatly different, the operation trajectories of the cutting torches of the four-section cutting machines cover a wide range. In order to avoid the damage of the cutting torches to the cutting-off rollers when cutting the casting blanks, the lifting cylinders are usually used to lift and swing the cutting-off rollers, and the roller tables are driven by the motor reducers to realize the transportation of the dummy bars and tail blanks. However, in the actual use process, the flame heat and the accumulation of steel slag are easy to cause the damage of the cylinder seals, the rupture of the oil pipes, the seizure of the bearings of the reducers, the short circuit of the motor grounding, and other faults, which directly affect the production, especially when the cutting torches cut various section casting blanks.

[0003] Taking the Ma Steel Long Material 2# continuous casting machine as an example, the square blank has an outer dimension of 165x165 mm, the rectangular blank has an outer dimension of 225x165 mm, the BB4 section has an outer dimension of 320x220x85 mm, and the BB3 section has an outer dimension of 430x300x90 mm. The maximum and minimum section width difference is more than 2.6 times, and the per-meter blank weight difference is also more than 2.7 times, so the process pulling speed difference is also very large, among which the square blank is 2.5-3.5 m / min, the rectangular blank is 1.5-2.6 m / min, the BB4 special-shaped blank is 1.2-2.25 m / min, and the BB3 special-shaped blank is 0.8-1.6 / min. The cutting torch gun speeds matched with them are 280-300 mm / min for the square blank, 260-280 mm / min for the rectangular blank, 240-260 mm / min for the BB4 special-shaped blank, and 160-200 mm / min for the BB3 special-shaped blank.

[0004] As shown in Figure 1 The commonly used continuous casting blank cutting system is composed of a cutting machine 1, a swing roller 2, a pre-cutting roller 3, a post-cutting roller 4, and the like. The cutting machine 1 includes a cart walking mechanism 11, a cutting torch walking mechanism 12, a cutting torch 13, and a pressure head 14. The cart walking mechanism 11 and the cutting torch walking mechanism 12 move in two directions to form a cutting trajectory, and the pressure head 14 presses the casting blank to make the cutting machine 1 move synchronously. The swing roller 2 is composed of a roller body 21, a lifting cylinder 22, and a three-in-one reducer 23. The roller body 21 is supported by two end bearing seats, the lifting cylinder 22 is assembled on one side of the roller body 21, and the three-in-one reducer 23 is assembled on the other side of the roller body 21. The swing rollers 2 are uniformly arranged in the cutting area.

[0005] The slope difference of the high and low pulling speed cutting speed matching of each section is large, the cutting track covers a wide range, and the adjustment margin of the space and time of the commonly used swing roller or telescopic roller is insufficient, and further, the cutting torch flame and the steel slag are easy to damage the swing roller and the oil cylinder, the speed reducer and the motor and the like. Compared with the slab and round billet continuous casting machine for producing the same shape billet, the flame cutting technology and method of the multi-section billet are lacked in the present technology.

[0006] As disclosed in a patent CN221064358U, a stroke control device for cutting swing roller of a continuous casting machine is provided, the limit switch is away from the cutting area, and the failure is reduced, but the matching problem of the pulling speed and the cutting speed of the multiple different sections is not solved; as disclosed in a patent CN112317709A, a control system and method for cutting of a continuous casting machine are provided, the roller group is not damaged in the cutting of the flame cutting machine, but the method is complex in operation, the control process is high in requirement, and the failure rate is high in the high temperature and water accumulation environment. SUMMARY

[0007] In view of the deficiencies in the prior art, the present application provides a billet cutting system and method of a multi-section continuous casting machine, so as to achieve the purposes of stable and reliable cutting operation and less damage to the equipment.

[0008] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0009] A billet cutting system of a multi-section continuous casting machine, comprising a flame cutting machine and a support roller structure arranged below the flame cutting machine and supporting the billet, the support roller structure being a fixed cantilever roller, the fixed cantilever roller comprising a water-cooled column, a mandrel, a chain wheel system and a base roller, the mandrel being rotatably arranged at the top of the water-cooled column and extending out from both ends, the chain wheel system being arranged on one end of the mandrel, and the base roller being arranged on the other end of the mandrel to form a cantilever roller structure.

[0010] An outer end of the base roller is provided with a detachable connecting roller structure.

[0011] One side of the water-cooled column is provided with an inclined slag baffle below the base roller.

[0012] An outer end of the base roller is provided with a tapered hole, and an inner side of the connecting roller is provided with a tapered cone matched with the tapered hole and fastened by a fastener.

[0013] In the cutting area, two sets of support roller structures are arranged, and the two sets of cantilever roller structures are arranged on opposite sides.

[0014] A slag flushing water system is arranged corresponding to the slag baffle, the slag flushing water system comprising a slag flushing water pipe and a group of slag flushing heads arranged on the slag flushing water pipe, the slag flushing water pipe being laid on the slag baffle along the inner side of the water-cooled column, and the slag flushing heads horizontally facing the slag baffle, so that a water curtain is formed on the whole surface of the slag baffle during operation.

[0015] Also included are a front cutting roller and a rear cutting roller, and the two sets of cantilever rollers are arranged between the front cutting roller and the rear cutting roller, and the distance between the two sets of cantilever rollers is adjusted according to all cutting tracks of various cross sections.

[0016] The sprocket system of the cantilever roller structure is connected with the sprocket arranged on the front cutting roller or the rear cutting roller through a chain, and the power equipment is outside the cutting area.

[0017] The fire cutting machine comprises a cart walking mechanism, a cutting torch walking mechanism, a cutting torch, a pressure head structure and an infrared distance measuring system for detecting the length of the casting blank, a cart sensor for detecting position control is arranged corresponding to the cart walking mechanism, and a cutting torch sensor for detecting position control is arranged corresponding to the cutting torch walking mechanism.

[0018] A control method of the casting blank cutting system of the multi-section continuous casting machine comprises the following steps:

[0019] Analyzing the cross section form and adjusting the cutting starting point;

[0020] Analyzing the rectangular blank cross section, the special-shaped blank cross section and the square blank cross section, and adjusting the cutting starting point according to the different casting blank pulling speed and cutting torch speed, and the two sets of cantilever roller structures can avoid the cutting track.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. A cantilever roller is designed, and the relative installation is reasonable to avoid the cutting track of the cutting torch, the fixed structure design cancels the lifting oil cylinder, the telescopic oil cylinder and the like, and the most simplified component realizes the maximum function;

[0023] 2. The cantilever roller is designed as a combination of a base roller and a connecting roller, different lengths of the connecting roller can be replaced according to the cutting track of different cross sections, the contact width of the casting blank and the roller group can be increased, the casting blank runs more stably, and the cutting track can be effectively avoided;

[0024] 3. Chain transmission is adopted, the power is output by the front cutting roller and the rear cutting roller, the speed reducer motor and the like of the cutting down roller are cancelled, the power equipment is moved out of the cutting area, and the equipment is not easy to be damaged;

[0025] 4. A side water slag flushing system is adopted, the side water flushing cools the whole surface, and the damage of the slag flushing water pipe and other accessories caused by the steel slag is effectively avoided;

[0026] 5. A control program of the cart walking and the cutting torch walking of the fire cutting machine is adopted, different cutting starting points are set according to different cross sections, the cantilever roller connecting roller design is matched, and the most reasonable cutting avoidance route is realized. BRIEF DESCRIPTION OF DRAWINGS

[0027] The content expressed by each drawing of the present specification and the marks in the drawings are briefly described as follows:

[0028] Figure 1It is a schematic diagram of a common continuous casting billet cutting system.

[0029] Figure 2 It is a schematic diagram of a fixed cantilever of the present application.

[0030] Figure 3 It is a schematic diagram of a fixed cantilever roller arrangement of the present application.

[0031] Figure 4 It is a schematic diagram of a billet cutting point adjustment process for a square billet and a rectangular billet of the present application.

[0032] Figure 5 It is a schematic diagram of a billet cutting point adjustment process for a BB4 and a BB3 shaped billet of the present application.

[0033] Figure 6 It is a schematic diagram of a roller body length adjustment process for a square billet and a rectangular billet of the present application.

[0034] Figure 7 It is a schematic diagram of a billet cutting system of the present application.

[0035] Figure 8 It is a schematic diagram of a square billet cutting control program of the present application.

[0036] Figure 9 It is a schematic diagram of a rectangular billet cutting control program of the present application.

[0037] Figure 10 It is a schematic diagram of a BB4 shaped billet cutting control program of the present application.

[0038] Figure 11 It is a schematic diagram of a BB3 shaped billet cutting control program of the present application. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] As shown in the drawings, Figures 2 to 11 The billet cutting system of the multi-section continuous casting machine includes a cutting machine and a support roller structure arranged below the cutting machine to support the billet; the support roller structure is a fixed cantilever roller, which includes a water-cooled column, a mandrel, a chain wheel system, and a base roller; the mandrel is rotatably arranged at the top of the water-cooled column and extends out from both ends, the chain wheel system is arranged on one end of the mandrel, and the base roller is arranged on the other end of the mandrel to form a cantilever roller structure.

[0041] The outer end of the base roller is provided with a detachable connecting roller structure; the outer end of the base roller is provided with a conical hole, and the inner side of the connecting roller is provided with a conical platform matched with the conical hole and fastened by a fastener. The cantilever roller is designed as a combination of the base roller and the connecting roller, which can replace connecting rollers of different lengths according to different cutting trajectories, thereby increasing the contact width between the billet and the roller set to make the billet run more smoothly and effectively avoiding the cutting trajectory.

[0042] The side of the water-cooled column is provided with an inclined slag baffle below the base roll; further, a slag flushing water system is provided corresponding to the slag baffle, the slag flushing water system comprises a slag flushing water pipe and a group of slag flushing heads arranged on the slag flushing water pipe, the slag flushing water pipe is arranged on the slag baffle along the inner side of the water-cooled column, and the slag flushing heads horizontally face the slag baffle, and the whole surface of the slag baffle forms a water curtain during work. The whole surface is cooled by side water flushing, and damage of the slag flushing water pipe and other accessories caused by the steel slag is effectively avoided.

[0043] The present application also includes a front cutting roll and a rear cutting roll, and the cutting area between the front cutting roll and the rear cutting roll; in the cutting area, two sets of support roll structures are arranged, and the two sets of cantilever roll structures are arranged in opposite positions; the two sets of cantilever rolls are arranged between the front cutting roll and the rear cutting roll, and the distance is adjusted according to all cutting tracks of various cross sections. The cantilever roll design is reasonably installed to avoid the cutting track of the cutting torch, and the fixed structure design cancels the lifting oil cylinder, telescopic oil cylinder and the like, so as to realize the maximum function of the most simplified components.

[0044] The chain wheel system of the cantilever roll structure is connected with the chain wheel arranged on the front cutting roll or the rear cutting roll through a chain, and the power equipment is outside the cutting area; the power is output by the front cutting roll and the rear cutting roll, the reducer motor of the cutting roll is cancelled, the power equipment is moved out of the cutting area, and stable and reliable operation is realized.

[0045] The fire cutting machine comprises a cart walking mechanism, a cutting torch walking mechanism, a cutting torch, a pressure head structure and an infrared distance measuring system for detecting the length of the casting blank, a cart sensor for detecting position control is arranged corresponding to the cart walking mechanism, and a cutting torch sensor for detecting position control is arranged corresponding to the cutting torch walking mechanism.

[0046] The control method of the casting blank cutting system of the multi-section continuous casting machine comprises the following steps:

[0047] Analysis of section form-adjustment of cutting starting point;

[0048] Analysis of rectangular blank section, special-shaped blank section and square blank section, and adjustment of the cutting starting point according to the casting blank pulling speed and the cutting torch speed, and the two sets of cantilever roll structures can avoid the cutting track.

[0049] The present application adopts the control program of the cart walking and the cutting torch walking of the fire cutting machine, sets different cutting starting points for different sections, cooperates with the cantilever roll connection roll design, and realizes the most reasonable cutting avoidance route.

[0050] The present application adopts fixed cantilever roller with base roller and connecting roller combination, cancels swing oil cylinder, reducer motor and other equipment; designs a control program for cutting of different section billets, sets the cutting starting point of the machine trolley, combines with the connecting roller length of the cantilever roller, realizes the most reasonable cutting avoidance line; adopts side water slag flushing system, solves the problem that the upflowing slag water pipe is easily accumulated with steel slag and is not easy to clean; adopts chain transmission, outputs power by the front and rear cutting rollers, solves the technical problem that the existing reducer motor is easily damaged in the cutting area. The above points form the overall technology of multi-section billet cutting, solve the problems of high equipment failure and high maintenance cost in the existing technology.

[0051] The preferred specific examples of the present application are:

[0052] As shown in Figure 2 The newly designed fixed cantilever roller 5 includes a base 51, a water-cooled column 52, a shaft 53, a bearing 54, a base roller 55, a connecting roller 56, a slag baffle 57 and a slag flushing water system 58; the base 51 is fixed with the foundation beam, facilitating overall adjustment, installation, adjustment and disassembly, and improving the rigidity of the fixed cantilever roller 5; the water-cooled column 52 has an inlet and return water passage, realizing frame water cooling and improving the bearing operating environment; the top of the water-cooled column is processed with a hole seat 521, the hole seat 521 is assembled with the bearing 54 and the shaft 53, one side of the shaft 53 is assembled with the base roller 55 through a flat key, and the other side is assembled with a chain wheel system 6; the slag baffle 57 is obliquely laid below the fixed cantilever roller 5, covering the entire cutting area; the slag flushing water pipe 581 is laid on the slag baffle 57 along the inner side of the water-cooled column 52, and the slag flushing head 582 is horizontally directed to the slag baffle 58; during operation, the slag baffle 57 forms a water curtain on the whole surface, avoiding slagging.

[0053] As shown in Figure 3As shown, the base roller 55 and the mandrel 53 are assembled by a key with interference, as a rotating base roller is not easily disassembled, and will not be cut by the flame in the cutting area. The base roller 55 is processed with a tapered hole 551 on one side. The connecting roller 56 may be cut in abnormal conditions, and is processed with a tapered cone 561 on one side, which cooperates with the tapered hole 551 on the base roller 55. The center is processed with a hole 552, which cooperates with the threaded hole 531 on one end of the mandrel 53, and is fastened by a bolt, so that the connecting roller 56 can be quickly replaced and reliably connected. The base roller 55 and the connecting roller 56 have a designed length on the roller body, and the length of the base roller 55 cannot exceed the theoretical center line of the casting blank, so as to avoid being cut by the cutting torch. The length of the connecting roller 56 needs to exceed the theoretical center line of the casting blank, so as to avoid the casting blank or the dummy bar from falling off the roller way. In the cutting area, two fixed cantilever rollers 5 are arranged in opposite directions, and the distance therebetween is adjusted according to all cutting trajectories of various sections. Taking the long material 2# machine of the applicant as an example, the swing rollers 2 are uniformly distributed in the cutting area, and the distance between the two groups of roller ways and the pre-cutting roller 3 and the post-cutting roller 4 is 1448mm. According to the cutting trajectories of the casting blanks of four sections, the distance between the first group of fixed swing rollers 5 and the pre-cutting roller 3 is adjusted to 1036mm, and the distance between the two groups of fixed cantilever rollers 5 and the post-cutting roller 4 is adjusted to 1600mm. The design length of the base roller 55 of the fixed cantilever roller 5 does not exceed the theoretical center line of the casting blank, and the distance therebetween is 30mm. The design length of the connecting roller 56 exceeds the theoretical center line of the casting blank by 30mm. Once the connecting roller 56 is cut, it can be quickly replaced by using the production gap.

[0054] As shown in Figure 3 and Figure 4 Adjusting only the distance between the fixed cantilever rollers 5 cannot avoid the cutting trajectory. The present application designs a new cutting method by adjusting the cutting starting point position. The cutting starting point of the traditional flame cutting machine is fixed and consistent. The cutting starting points of the four sections of the long material 2# continuous casting machine of the applicant are the same, and the distance from the pre-cutting roller 3 is 497mm. The diameter of the outlet flame of the cutting torch is usually 20-30mm. The cutting trajectory is calculated by taking the outer edge of the outlet flame as the reference. Therefore, the gap between the cutting torch trajectory and the connecting roller 56 is basically guaranteed to be not cut. The cutting starting point position adjustment method is determined. The original cutting point is taken as the reference. The cutting trajectory is shifted as a whole to the outermost edge of the connecting roller 56 close to or away from the first fixed cantilever roller 5, and the gap therebetween is kept at 5-10mm. The position is the cutting starting point position of the cutting torch.

[0055] Example 1: as shown in Figure 4As shown, the square blank section, casting blank pulling speed 2500-3500 mm / min, cutting torch speed 280-320 mm / min, taking two limit value trajectories, the original cutting torch trajectory of the cutting point will cut the first fixed cantilever roll, the maximum cutting distance is 25 mm, and the distance from the second fixed cantilever roll is 53 mm. Adjust the cutting point, adjust 283 mm to the first fixed cantilever roll, the cutting torch trajectory is 6 mm away from the first fixed cantilever roll, and 43 mm away from the second fixed cantilever roll, both roll groups can avoid.

[0056] Example 2: as shown in Figure 4 The rectangular blank section, the casting blank pulling speed is 1500-2600 mm / min, the cutting torch speed is 260-280 mm / min, taking two limit value trajectories, the original cutting torch trajectory of the cutting point will cut the first fixed cantilever roll, the maximum cutting distance is 38 mm, and the distance from the second fixed cantilever roll is 83 mm. Adjust the cutting point, adjust 268 mm to the first fixed cantilever roll, the cutting torch trajectory is 8 mm away from the first fixed cantilever roll, and 42 mm away from the second fixed cantilever roll, both roll groups can avoid.

[0057] Example 3: as shown in Figure 5 The BB4 shaped blank section, the casting blank pulling speed is 1200-2250 mm / min, the cutting torch speed is 240-260 mm / min, taking two limit value trajectories, the original cutting torch trajectory of the cutting point will cut the first fixed cantilever roll, the maximum cutting distance is 9 mm, and the distance from the second fixed cantilever roll is 53 mm. Adjust the cutting point, adjust 68 mm to the first fixed cantilever roll, the cutting torch trajectory is 5 mm away from the first fixed cantilever roll, and 31 mm away from the second fixed cantilever roll, both roll groups can avoid.

[0058] Example 4: as shown in Figure 5 The BB3 shaped blank section, the casting blank pulling speed is 800-1600 mm / min, the cutting torch speed is 160-200 mm / min, taking two limit value trajectories, the original cutting torch trajectory of the cutting point will cut the first fixed cantilever roll, the maximum cutting distance is 9 mm, and the distance from the second fixed cantilever roll is 53 mm. Adjust the cutting point, adjust 68 mm to the first fixed cantilever roll, the cutting torch trajectory is 5 mm away from the first fixed cantilever roll, and 31 mm away from the second fixed cantilever roll, both roll groups can avoid.

[0059] As shown in Figure 6As shown, when designing the fixed cantilever roll 5, the roll body exceeds the theoretical center line of the cast slab by 30 mm after the roll 56 is installed in place, and for BB4 beam blank and BB3 beam blank, the single roll contact with the cast slab reaches 190 mm and 245 mm respectively, which can fully ensure the reliable operation of the cast slab and even the dummy bar, but for rectangular blank and square blank, the single roll contact with the cast slab is only 142 mm and 112 mm respectively, and when the dummy bar is sent or the tail blank is pulled, if the centering of the dummy bar and the tail blank is poor, the single set of fixed cantilever roll 5 may slip off. Therefore, according to the distance between the cutting trajectory of the square blank and the rectangular blank and the second fixed cantilever roll 5, the roll body length of the roll 56 of the second fixed cantilever roll 5 can be increased by 30 mm, so that the contact length of the second fixed cantilever roll 5 of the rectangular blank and the square blank is increased to 172 mm and 142 mm respectively, to solve the possible problems of the square and rectangular blank sending and pulling the dummy bar or the tail blank. The above adjustment data can be optimized according to the actual situation, and the above related parameters (such as the roll body exceeding the theoretical center line of the cast slab by 30 mm after the roll is installed) are not limited.

[0060] As shown in Figure 7 In order to ensure that the cutting area equipment is not easily damaged, the original swing roll structure transmission three-in-one speed reducer is removed, and the power system is completed by the chain mechanism 6; the core shaft of the pre-cutting roll 3 and the post-cutting roll 4 is increased, and a chain wheel 61 is installed, a chain wheel 61 is installed on the core shaft 53 of the fixed cantilever roll 5, the pre-cutting roll 3 is connected with the first fixed cantilever roll 5 through the chain, and the post-cutting roll 4 is connected with the second fixed cantilever roll 5, so that the power system of the pre-cutting roll 3 and the post-cutting roll 4 drives the fixed cantilever roll 5, solving the problem of easy slippage of the tail blank without driving. The cutting of the cast slab is controlled by the corresponding control points, the running position of the torch 1 is detected by the cart sensor 15, and the zero limit 16 is set; the walking position of the cutting torch 13 is detected by the cutting torch sensor 17, and the zero limit 18 is set; the pressure head 14 has three control positions of high position, pre-pressing position and pressing-down position; the length of the cast slab is measured by the infrared distance measuring system 7.

[0061] As shown in Figures 8 to 11 A cutting control program of the torch cutter is designed,

[0062] Wherein NCM is a "numerical comparison" function block, QV is "1" when X1>X2, QL is "1" when X1X2, and QE is "1" when X1=X2; RSR is an "RS flip-flop with reset end R priority" function block; ADD is an "addition" function block; SUB is a "subtraction" function block; MUL is a "multiplication" function block; AND is an "AND gate". The gauge control program is composed of three control units, i.e. the function blocks HQJTC11-HQJTC17 constitute the torch cutter cart positioning control unit; the function blocks HQJTC21-HQJTC28 constitute the cutting torch pre-cutting control unit; the function blocks HQJTC31-HQJTC38 constitute the cutting torch cutting and ending control unit; the control principles of the four kinds of cross-section cast blanks are the same, except that the corresponding parameters of the function blocks are different.

[0063] The bloom cutting control program is taken as an example: inputting the bloom production instruction, the fire cutting machine pressure head high position signal, the cutting torch zero position signal, the cart zero position signal, the "or" function block HQJTC11 outputs "1" to trigger the fire cutting machine cart operation encoder counting and comparing the value of 283mm through the multiplication function block HQJTC13 to adjust the cutting torch cutting starting point; meanwhile, the signal output by the "value comparison" function block HQJCT14 triggers the infrared sizing system to modify the sizing measurement length through the addition function block HQJCT17;

[0064] The precondition A triggers the infrared sizing to modify the length B, and when the bloom length reaches Bx0.9, the "multiplication" function block HQJTC22 is triggered; the fire cutting machine pressure head is triggered to be pre-pressed down, the cutting torch is triggered to run, and the encoder is counted, and the cutting torch running distance is calculated through the "multiplication" function block HQJTC25, and meanwhile, the bloom production instruction triggers the "subtraction" function block HQJCT25 to calculate the distance between the cutting torch zero position and the bloom pre-cutting position. When the two distances are the same, the "value comparison" function block HQJCT27 is triggered to ignite the cutting torch preheating point, and the cutting condition is met;

[0065] When the infrared sizing measurement length is the same as B, the fire cutting machine pressure head is triggered to be pressed down, the cutting torch cutting oxygen is opened, and the cutting torch is run at the given cutting speed, the "multiplication" function block HQJTC35 is used to control the cutting torch distance according to the given cutting speed and time, when the actual running distance of the cutting torch is the same as the given distance, the "value comparison" function block HQJCT36 is output to trigger the pressure head to be lifted up and the cutting oxygen to be closed, and the cutting torch is triggered to run according to the distance calculated by the "multiplication" function block HQJCT37, and the cutting torch output zero position instruction is obtained according to the "value comparison" function block HQJCT38; the program enters the cutting of the next bloom.

[0066] In the present application, the cantilever roller reasonably avoids the cutting track, and the side slag flushing design avoids the accumulation of steel slag, and the fixed type and the power external hanging type solve the problem that the cutting area equipment is easy to be damaged. The optimized cutting torch cutting starting point distance makes various sections reasonably avoid the cutting track, and is interlocked with the infrared distance measuring device to form a cutting control program of different sections. From the implementation situation, the present application greatly improves the high failure rate of the existing swing roller, the cantilever roller design facilitates replacement, reduces the slag cleaning work and maintenance work intensity, and has high automatic control degree and is convenient for parameter optimization adjustment. The technology has strong practicability, wide application prospect and high popularization value.

[0067] The above only describes the preferred embodiments of the present application, and the above technical features can be arbitrarily combined to form multiple embodiment schemes of the present application.

[0068] The application is described above in conjunction with the drawings, and it is obvious that the specific implementation of the application is not limited by the above manner, as long as various non-essential improvements are made by adopting the concept and technical scheme of the application, or the concept and technical scheme of the application is directly applied to other occasions without improvement, which are all within the protection scope of the application.

Claims

1. A slab cutting system of a multi-strand continuous caster comprising a torch cutter and a support roll structure for supporting a cast slab below the torch cutter, characterized in that: The support roller structure is a fixed cantilever roller, which comprises a water-cooled column, a mandrel, a chain wheel system and a base roller, the mandrel is rotatably arranged at the top of the water-cooled column and extends from both ends, the chain wheel system is arranged on one end of the mandrel, and the base roller is arranged on the other end of the mandrel to form a cantilever roller structure.

2. The slab cutting system of the multi-strand caster as claimed in claim 1, wherein: The outer end of the base roller is provided with a detachable connecting roller structure.

3. The strand cutting system of claim 1 wherein: One side of the water-cooled column is provided with an inclined slag baffle below the base roller.

4. The slab cutting system of the multi-strand caster as claimed in claim 2, wherein: The outer end of the base roller is provided with a tapered hole, and the inner side of the connecting roller is provided with a tapered cone matched with the tapered hole and fastened by a fastener.

5. The billet cutting system of the multi-section continuous casting machine as described in claim 2, characterized in that: In the cutting area, two sets of support roller structures are arranged, and the two sets of cantilever roller structures are arranged opposite to each other.

6. The slab cutting system of the multi-strand caster as claimed in claim 3, wherein: A slag flushing water system is arranged corresponding to the slag baffle, which comprises a slag flushing water pipe and a group of slag flushing heads arranged on the slag flushing water pipe, the slag flushing water pipe is arranged on the slag baffle along the inner side of the water-cooled column, and the slag flushing heads horizontally face the slag baffle, and the working slag baffle forms a water curtain.

7. The slab cutting system of claim 5 wherein: the first and second cutting stations are located on opposite sides of the casting machine; and the first and second cutting stations are located on opposite sides of the casting machine. It also includes a front cutting roller and a rear cutting roller, and the two sets of cantilever rollers are arranged between the front cutting roller and the rear cutting roller, and the distance is adjusted according to all cutting trajectories of various sections.

8. The slab cutting system of the multi-strand caster as claimed in claim 7, wherein: The chain wheel system of the cantilever roller structure is connected with the chain wheel arranged on the front cutting roller or the rear cutting roller through a chain, and the power equipment is outside the cutting area.

9. The slab cutting system of the multi-strand caster as claimed in claim 1, wherein: The flame cutting machine comprises a cart walking mechanism, a cutting gun walking mechanism, a cutting gun, a pressure head structure and an infrared distance measuring system for detecting the length of the casting blank, a cart sensor for detecting position control is arranged corresponding to the cart walking mechanism, and a cutting gun sensor for detecting position control is arranged corresponding to the cutting gun walking mechanism.

10. A method of controlling a slab cutting system of a multi-strand caster as claimed in any one of claims 1 to 9, characterized in that: The control method comprises the following steps: Analyzing the section form to adjust the cutting starting point; Analyzing the rectangular blank section, the special-shaped blank section and the square blank section, and adjusting the cutting starting point according to the casting blank pulling speed and the cutting gun speed, and the two sets of cantilever roller structures can avoid the cutting trajectory.

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