Roll gap dynamic compensation method and roll gap setting method

Abstract

The invention provides a roll gap dynamic compensation method and a roll gap setting method, and belongs to the technical field of continuous casting production.In the casting blank production process, the state of a casting blank through which a current fan-shaped section passes is judged, and when the casting blank is in different states, deformation influences on the fan-shaped section are different; the method comprises the following steps: acquiring a pre-stored roll gap compensation amount implementation scheme corresponding to a casting blank state from an upper system of a continuous casting machine as a target roll gap compensation amount implementation scheme, and determining the roll gap compensation amount of a current fan-shaped section according to the target roll gap compensation amount implementation scheme; therefore, factors of different fan-shaped section deformation conditions caused by different casting blank states borne by the fan-shaped sections in actual production are fully considered, and the compensation amount is dynamically adjusted according to the stress conditions of the fan-shaped sections in the actual production process. The problems that in the prior art, according to a fixed fan-shaped section roller gap compensation method, the service life of a roller is easily shortened, and even the roller is broken are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting production, and more specifically, to a method for dynamically compensating roll gap and a method for setting roll gap. Background Art

[0002] At present, in order to improve the operation rate of the continuous casting machine and improve the internal quality of the continuous casting billet, the segment of the slab caster often adopts dynamic remote control of the roll gap. The segment uses four hydraulic cylinders to clamp the upper and lower frames and the displacement sensors built in the clamping cylinders to judge the positions of the cylinders. By controlling the control valve group on the segment to supply oil to the upper and lower chambers of the cylinders respectively, the opening degree of the roll gap is adjusted.

[0003] Under one working condition, the roll gap of the segment is controlled according to a fixed roll gap table. Under another working condition, the roll gap of the segment can be reduced at the solidification end point of the continuous casting billet, so as to perform reduction on the continuous casting billet. In these two working conditions, the roll gap of the segment will change due to the deformation of the segment frame, tie rods, etc., and this change cannot be detected by the sensor. If this change cannot be compensated properly, the actual roll gap of the segment cannot meet the production requirements. Generally, a set of fixed compensation values are set to compensate the roll gap of each segment to offset the influence of the segment deformation on the roll gap. At this time, the roll gap of the segment will be smaller than the thickness of the continuous casting billet.

[0004] The more backward the segment is, the greater the hydrostatic pressure of the molten steel, the greater the deformation of the segment, and the greater the required compensation amount. The conventional fixed compensation method often gives a compensation amount of 1-2 mm. When producing a wider section, the casting speed of the continuous casting machine is lower. In this case, the continuous casting billet is often fully solidified relatively early. At this time, the roll gap compensation will cause the segment to bear a large force, resulting in a decrease in the roll life and even a roll break problem.

[0005] In summary, the existing roll gap compensation method for the segment ignores the factors that the deformation conditions of each segment in actual production are different due to different continuous casting billet states, which easily leads to a decrease in the roll life and even a roll break phenomenon.

[0006] It should be noted that the information disclosed in the above background art section is only used to strengthen the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] In view of the above problems, the purpose of the present invention is to provide a method for dynamically compensating roll gap and a method for setting roll gap to solve the problems in the prior art that the fixed roll gap compensation method for the segment ignores the factors that the deformation conditions of each segment in actual production are different due to different continuous casting billet states, which easily leads to a decrease in the roll life and even a roll break phenomenon.

[0008] The roll gap dynamic compensation method provided by the present invention is used for setting the roll gap of a slab continuous casting machine during the slab production process, and includes the following steps:

[0009] During the slab production process, judge the state of the slab passing through the current segment;

[0010] Obtain, from the upper-level system of the continuous casting machine, the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the current segment as the target roll gap compensation amount implementation plan; wherein, in the upper-level system of the continuous casting machine, there are pre-stored the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the segment being the molten steel state, the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the segment being the solidification end state, and the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the segment being the fully solidified state;

[0011] Determine the roll gap compensation amount of the current segment according to the target roll gap compensation amount implementation plan.

[0012] In addition, preferably, the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the segment being the molten steel state is: the roll gap compensation amount of the segment is the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel.

[0013] In addition, preferably, the roll gap compensation amount implementation plan corresponding to the state of the slab passing through the segment being the solidification end state is:

[0014] The roll gap compensation amount of the segment is the sum of the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel and the compensation amount required for the roll gap change caused by the segment pressing down.

[0015] In addition, preferably, the calculation formula for the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel is:

[0016] B1i = M * n / N; where,

[0017] B1i is the compensation amount required for the roll gap change of segment i caused by the hydrostatic pressure of the molten steel, M is the maximum deformation amount of segment i, n is the width of the produced slab, and N is the maximum width of the slab.

[0018] In addition, preferably, the calculation formula for the compensation amount required for the roll gap change caused by the segment pressing down is:

[0019] where,

[0020] B2i is the compensation amount required for the roll gap change of segment i caused by the segment pressing down, P is the effective pressure of the clamping cylinder of segment i, S is the effective area of the clamping cylinder of segment i, L is the original length of the tie rod, A is the cross-sectional area of the tie rod, and E is the Young's modulus of the tie rod.

[0021] In addition, a preferred solution is that the implementation plan of the roll gap compensation amount corresponding to the fully solidified state of the billet passed through by the segment is as follows:

[0022] The roll gap compensation amount of the segment is set to 0, and the pressure of the clamping cylinder of the segment is lowered downward to 10 MPa.

[0023] In addition, a preferred solution is that before judging the state of the billet passed through by the current segment during the billet production process, it further includes:

[0024] Obtain the position information of the head and tail of the produced billet;

[0025] Along the billet drawing direction, when the head of the produced billet exceeds the end of the current segment by more than 2 m and the tail of the produced billet is more than 2 m away from the head of the current segment, judge the state of the billet passed through by the current segment, obtain the implementation plan of the target roll gap compensation amount, and determine the roll gap compensation amount of the current segment according to the implementation plan of the target roll gap compensation amount; otherwise, cancel the roll gap compensation amount of the current segment.

[0026] In the method for setting the roll gap of the slab continuous casting machine provided by the present invention, during the billet production process, the above-mentioned roll gap dynamic compensation method is adopted to determine the roll gap compensation amount of each segment; and for each segment, subtract the roll gap compensation amount from the preset initial roll gap value to obtain the roll gap setting value of each segment, so as to complete the roll gap setting of the slab continuous casting machine.

[0027] In addition, a preferred solution is that the initial roll gap value is preset according to the thickness of the produced billet and solidification shrinkage and stored in the upper computer system of the slab continuous casting machine.

[0028] In addition, a preferred solution is that after the roll gap setting of the slab continuous casting machine is completed, the roll gap setting value of each segment is displayed on the PLC control interface of the continuous casting machine.

[0029] As can be seen from the above technical solutions, in the roll gap dynamic compensation method and roll gap setting method provided by the present invention, during the billet production process, by judging the state of the billet passed through by the current segment, when the billet is in different states, the deformation influence on the segment is different. Obtain the implementation plan of the roll gap compensation amount corresponding to the billet state pre-stored in the upper computer system of the continuous casting machine as the target roll gap compensation amount implementation plan, and then determine the roll gap compensation amount of the current segment according to the target roll gap compensation amount implementation plan, so as to fully consider the different factors of the segment deformation caused by the different billet states received by each segment in actual production, and dynamically adjust the compensation amount according to the force condition of the segment in the actual production process, effectively solving the problem that the fixed roll gap compensation method of the segment in the prior art easily leads to a decrease in the roll life and even the occurrence of roll breakage.

[0030] To achieve the above and related purposes, one or more aspects of the present invention include features that will be described in detail later. The following description and the accompanying drawings detail certain exemplary aspects of the present invention. However, these aspects merely indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to cover all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand.

[0032] Figure 1 is a flowchart of a roll gap dynamic compensation method according to an embodiment of the present invention;

[0033] Figure 2 is an overall layout diagram of a segment according to an embodiment of the present invention;

[0034] Figure 3 is a schematic structural diagram of a segment according to an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a clamping device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In view of the problem mentioned above, in the prior art, the fixed roll gap compensation method for segments ignores the factors of different deformations of each segment caused by different slab states in actual production, which easily leads to a decrease in the roll life and even the phenomenon of roll breakage. A roll gap dynamic compensation method and a roll gap setting method are proposed.

[0037] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0038] To illustrate the roll gap dynamic compensation method and the roll gap setting method provided by the present invention, Figure 1 shows the flow of the roll gap dynamic compensation method according to an embodiment of the present invention; Figure 2 shows the overall layout of a segment according to an embodiment of the present invention; Figure 3 shows the structure of a segment according to an embodiment of the present invention; Figure 4 shows the structure of a clamping device according to an embodiment of the present invention.

[0039] As Figures 1 to 4 collectively shown, the roll gap dynamic compensation method provided by the present invention is used for roll gap setting of a slab continuous casting machine during the slab production process, and includes the following steps:

[0040] Step S1: During the continuous casting billet production process, determine the status of the continuous casting billet passing through the current segment.

[0041] Specifically, during the continuous casting billet production process, the solidification process of the continuous casting billet is calculated in real time through a heat transfer model, so as to judge the status of the continuous casting billet passing through each segment. Calculating the solidification process of the continuous casting billet through the heat transfer model is a common method in this field, and the present invention will not elaborate on this.

[0042] Step S2: Obtain the roll gap compensation amount implementation plan corresponding to the status of the continuous casting billet passing through the current segment from the upper-level system of the continuous caster as the target roll gap compensation amount implementation plan; wherein, in the upper-level system of the continuous caster, the roll gap compensation amount implementation plans corresponding to the status of the continuous casting billet passing through the segment being molten steel state, the status of the continuous casting billet passing through the segment being the solidification end state, and the status of the continuous casting billet passing through the segment being the fully solidified state are pre-stored.

[0043] Specifically, the roll gap compensation amount of the segment is generally divided into two parts. One part is the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel, and the other part is the compensation amount required for the roll gap change caused by the segment's reduction. Therefore, the roll gap compensation amount implementation plans corresponding to various statuses of the continuous casting billet passing through the segment can be pre-stored in the upper-level system of the continuous caster. Among them, the status of the continuous casting billet generally includes three types, namely molten steel state, solidification end state, and fully solidified state. When the continuous casting billet is in different states, the forces acting on the roll gap of the segment are different, so the optimal compensation plan for the roll gap should also be different. Based on the status of the continuous casting billet passing through the current segment, obtain the corresponding roll gap compensation amount implementation plan from the upper-level system of the continuous caster as the target roll gap compensation amount implementation plan.

[0044] Step S3: Determine the roll gap compensation amount of the current segment according to the target roll gap compensation amount implementation plan.

[0045] Specifically, according to the target roll gap compensation amount implementation plan, determine the roll gap compensation amount of the current segment, so as to determine the roll gap compensation amount of the current segment. By analogy, the roll gap of each segment is determined by using the corresponding roll gap compensation amount implementation plan.

[0046] As a preferred solution of the present invention, the roll gap compensation amount implementation plan corresponding to the status of the continuous casting billet passing through the segment being molten steel state is:

[0047] The roll gap compensation amount of the segment is the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel.

[0048] Specifically, when the billet passing through the segment is in the molten steel state, the segment does not need to be pressed down. Therefore, the roll gap change of the segment only needs to consider the roll gap change caused by the hydrostatic pressure of the molten steel, that is, the roll gap compensation amount of the segment at this time is the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel.

[0049] As a preferred embodiment of the present invention, the implementation scheme of the roll gap compensation amount corresponding to the solidification end state of the billet passing through the segment is as follows:

[0050] The roll gap compensation amount of the segment is the sum of the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel and the compensation amount required for the roll gap change caused by the segment pressing down.

[0051] Specifically, when the billet state is the solidification end state, pressing down treatment is required, that is, the roll gap change of the segment at this time needs to consider both the roll gap change caused by the hydrostatic pressure of the molten steel and the roll gap change caused by the segment pressing down. That is, the roll gap compensation amount of the segment at this time is the sum of the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel and the compensation amount required for the roll gap change caused by the segment pressing down.

[0052] As a preferred embodiment of the present invention, the calculation formula for the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel is:

[0053] B1i = M * n / N; where,

[0054] B1i is the compensation amount required for the roll gap change of segment i caused by the hydrostatic pressure of the molten steel, M is the maximum deformation amount of segment i, n is the width of the produced billet, and N is the maximum width of the billet.

[0055] Specifically, according to the roll arrangement design of the continuous casting machine, the maximum deformation amount of each segment can be calculated when the maximum billet width is reached, so as to obtain a fixed maximum roll gap compensation table, and then the compensation amount of each segment can be calculated according to the width of the produced billet.

[0056] As a preferred embodiment of the present invention, the calculation formula for the compensation amount required for the roll gap change caused by the segment pressing down is:

[0057] Where,

[0058] B2i is the compensation amount required for the roll gap change caused by the pressing down of segment i, P is the effective pressure of the clamping cylinder of segment i, S is the effective area of the clamping cylinder of segment i, L is the original length of the tie rod, A is the cross-sectional area of the tie rod, and E is the Young's modulus of the tie rod.

[0059] Specifically, the effective pressure P of the clamping cylinder of segment i can be obtained in real time according to the pressure sensor on the on-site oil cylinder, and other parameters (S, L, A, E) are all fixed values.

[0060] As a preferred embodiment of the present invention, the implementation scheme of the roll gap compensation amount corresponding to the fully solidified state of the slab passing through the segment is as follows:

[0061] The roll gap compensation amount of the segment is set to 0, and the pressure of the clamping cylinder of the segment is lowered to 10 MPa downward.

[0062] Specifically, during the production process, through the calculation of the solidification model, when the slab is fully solidified, the set value of the roll gap of the segment in the rear area generally adopts the initial roll gap, that is, the roll gap compensation amount of the segment is set to 0, and at the same time, the pressure of the clamping cylinder of the segment needs to be lowered to 10 MPa downward (generally reduced from 20 MPa to 10 MPa), on the one hand, ensuring that the rolls of the segment are in contact with the slab, and at the same time reducing the wear amount of the rolls.

[0063] As a preferred embodiment of the present invention, before judging the state of the slab passing through the current segment during the slab production process, it further includes:

[0064] Obtaining the position information of the head and tail of the produced slab;

[0065] Along the casting direction, when the head of the produced slab exceeds the end of the current segment by more than 2 m, and the tail of the produced slab is more than 2 m away from the head of the current segment, judge the state of the slab passing through the current segment, obtain the implementation scheme of the target roll gap compensation amount, and determine the roll gap compensation amount of the current segment according to the implementation scheme of the target roll gap compensation amount; otherwise, cancel the roll gap compensation amount of the current segment.

[0066] Specifically, during the production process, when starting casting and pulling the tail slab, the temperatures of the head and tail are relatively low. If the conventional fixed roll gap compensation method is used, when the head and tail pass through a certain segment, the load of the segment increases, which may cause the current of the transmission device of this segment to be too large and trip. Therefore, before judging the state of the slab passing through the current segment during the slab production process, first obtain the position information of the head and tail of the produced slab. When the head of the produced slab exceeds the end of the current segment by more than 2 m, and the tail of the produced slab is more than 2 m away from the head of the current segment, use the roll gap dynamic compensation method provided by the present invention to determine the roll gap compensation amount of the current segment; otherwise, cancel the roll gap compensation amount of the current segment to avoid excessive roll wear and overloading of the segment transmission device due to too small roll gap.

[0067] For the roll gap setting method of the slab continuous casting machine provided by the present invention, during the slab production process, use the roll gap dynamic compensation method as described above to determine the roll gap compensation amount of each segment; and for each segment, subtract the roll gap compensation amount from the preset initial roll gap value to obtain the roll gap set value of each segment, so as to complete the roll gap setting of the slab continuous casting machine.

[0068] As a preferred embodiment of the present invention, the initial roll gap value is preset according to the thickness of the continuously cast slab and solidification shrinkage, and stored in the upper-level system of the slab continuous caster.

[0069] As a preferred embodiment of the present invention, after the roll gap setting of the slab continuous caster is completed, the roll gap setting value of each segment is displayed on the PLC control interface of the continuous caster.

[0070] Specifically, on the control interface of the PLC, the calculated roll gap value (i.e., the roll gap value set by the above method) will be directly and real-time displayed to avoid misoperation.

[0071] In order to better illustrate the practical application of the roll gap dynamic compensation method and roll gap setting method provided by the present invention in detail, the following specific embodiments are provided.

[0072] Embodiment 1

[0073] For the segment adopting roll gap dynamic control, its initial roll gap setting value Gi is a set of continuously decreasing roll gap tables according to the slab thickness and solidification shrinkage. Taking a slab with a thickness of 230 mm as an example, its initial roll gap table is shown as follows.

[0074] Seg0 Seg1 Seg2 Seg3 Seg4 Seg5 Seg6 Seg7 Seg8 Seg9 Seg10 Seg11 Seg12 Seg13 Seg14 Entrance 237 236.5 236.3 236.1 235.9 235.7 235.5 235.3 235.1 234.9 234.7 234.5 234.3 234.1 233.9 Exit 236.5 236.3 236.1 235.9 235.7 235.5 235.3 235.1 234.9 234.7 234.5 234.3 234.1 233.9 233.7

[0075] The compensation of the roll gap of the segment is divided into two parts. One part is the compensation amount B1 required for the roll gap change caused by the hydrostatic pressure of the molten steel, and the other part is the compensation amount B2 required for the roll gap change caused by the segment's reduction.

[0076] The calculation of the compensation amount B1 adopts the method of looking up tables. According to the roll arrangement design of the continuous caster, the maximum deformation amount of each segment when the maximum slab width is produced can be calculated to obtain a fixed maximum roll gap compensation table. Then, according to the width of the produced slab, the compensation amount of each segment is calculated, that is, the compensation amount B1i of segment i = the maximum deformation amount of segment i * the width of the produced slab / the maximum width of the slab.

[0077] During the production process, if the slab state passing through the current segment i is the molten steel state, then at this time, the roll gap of this segment i is only affected by the roll gap change caused by the hydrostatic pressure of the molten steel. Therefore, the roll gap setting value of this segment i = the initial setting value - the compensation amount B1i.

[0078] For the compensation amount B2 required for the roll gap change caused by the segment's reduction, when the reduction is implemented, this segment has to bear the reaction force generated by the slab, and the compensation amount B2i can be calculated in real time according to the calculation formula of the compensation amount required for the roll gap change caused by the segment's reduction.

[0079] During the production process, if the billet state passing through the current segment i is the solidification end state, the roll gap setting value of the segment i = initial setting value - compensation amount B1i - compensation amount B2i.

[0080] During the production process, through the calculation of the solidification model, if the billet passing through the current segment is in a fully solidified state, the roll gap setting value of the segments in the rear area adopts the initial roll gap, that is, the roll gap compensation value is set to 0 at this time. At the same time, the pressure of the clamping cylinder is reduced from 20 MPa to 10 MPa, which can ensure the contact between the segment rolls and the billet while reducing the wear of the rolls.

[0081] In addition, during the production process, at the start of casting and when pulling the tail billet, the billet temperature is very low at this time, and the roll gap setting value still adopts the initial setting value to avoid excessive wear of the rolls and excessive load on the segment drive device due to too small roll gap. In terms of control, when the distance from the billet head and tail is more than 2 m, the roll gap setting value = initial setting value - compensation amount to ensure the billet quality.

[0082] On the control interface of the PLC, the above calculated roll gap value (set roll gap value) is displayed in real time to avoid separately giving the compensation value, which makes it difficult for the operator to understand and may cause misoperation problems.

[0083] It can be seen from the above specific implementation manners that the roll gap dynamic compensation method and roll gap setting method provided by the present invention determine the roll gap compensation amount of the current segment by judging the billet state passing through the current segment during the billet production process. Different billet states have different effects on the deformation of the segment. The implementation scheme of the roll gap compensation amount corresponding to the billet state pre-stored in the upper system of the continuous caster is used as the target roll gap compensation amount implementation scheme, and then according to the target roll gap compensation amount implementation scheme, the roll gap compensation amount of the current segment is determined, so as to fully consider the different factors of the segment deformation caused by the different billet states received by each segment in actual production, and dynamically adjust the compensation amount according to the magnitude of the force on the segment during the actual production process, effectively solving the problem that the fixed roll gap compensation method in the prior art is likely to lead to a decrease in the roll life and even the occurrence of broken rolls.

[0084] As described above, the roll gap dynamic compensation method and roll gap setting method proposed according to the present invention are described by way of example with reference to the drawings. However, those skilled in the art should understand that various improvements can be made to the above roll gap dynamic compensation method and roll gap setting method of the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A roll gap dynamic compensation method, used for the roll gap setting of a slab continuous casting machine during the slab production process, characterized in that The method includes the following steps: During the production of the continuous casting billet, judge the state of the continuous casting billet passing through the current segment; Obtain, from the upper-level system of the continuous caster, the roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the current segment as the target roll gap compensation amount implementation plan; wherein, in the upper-level system of the continuous caster, the roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being in the molten steel state, the roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being at the solidification end point state, and the roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being in the fully solidified state are pre-stored; Determine the roll gap compensation amount of the current segment according to the target roll gap compensation amount implementation plan.

2. The roll gap dynamic compensation method according to claim 1, wherein The roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being in the molten steel state is: The roll gap compensation amount of the segment is the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel.

3. The roll gap dynamic compensation method according to claim 2, wherein The roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being at the solidification end point state is: The roll gap compensation amount of the segment is the sum of the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel and the compensation amount required for the roll gap change caused by the segment pressing down.

4. The roll gap dynamic compensation method according to claim 3, wherein The calculation formula for the compensation amount required for the roll gap change caused by the hydrostatic pressure of the molten steel is: B1i = M * n / N; where B1i is the compensation amount required for the roll gap change of segment i caused by the hydrostatic pressure of the molten steel, M is the maximum deformation amount of segment i, n is the width of the continuous casting billet produced, and N is the maximum width of the continuous casting billet.

5. The roll gap dynamic compensation method according to claim 3, wherein The calculation formula for the compensation amount required for the roll gap change caused by the segment pressing down is: Among them, B2i is the compensation amount required for the roll gap change caused by segment i pressing down, P is the effective pressure of the clamping cylinder of segment i, S is the effective area of the clamping cylinder of segment i, L is the original length of the tie rod, A is the cross-sectional area of the tie rod, and E is the Young's modulus of the tie rod.

6. The roll gap dynamic compensation method according to claim 1, wherein The roll gap compensation amount implementation plan corresponding to the state of the continuous casting billet passing through the segment being in the fully solidified state is: The roll gap compensation amount of the segment is set to 0, and the pressure of the clamping cylinder of the segment is lowered downward to 10 MPa.

7. The roll gap dynamic compensation method according to claim 1, characterized in that Before judging the state of the continuous casting billet passing through the current segment during the production of the continuous casting billet, it further includes: Obtain the position information of the head and tail of the continuous casting billet produced; Along the billet pulling direction, when the head of the continuous casting billet produced exceeds 2 m beyond the end of the current segment and the tail of the continuous casting billet produced is more than 2 m away from the head of the current segment, judge the state of the continuous casting billet passing through the current segment, obtain the target roll gap compensation amount implementation plan, and determine the roll gap compensation amount of the current segment according to the target roll gap compensation amount implementation plan; otherwise, cancel the roll gap compensation amount of the current segment.

8. A roll gap setting method for a slab continuous casting machine, characterized in that, During the production of the continuous casting billet, use the roll gap dynamic compensation method according to any one of claims 1-7 to determine the roll gap compensation amount of each segment; and for each segment, subtract the roll gap compensation amount from the preset initial roll gap value to obtain the roll gap setting value of each segment, so as to complete the roll gap setting of the slab continuous caster.

9. The roll gap setting method for a slab continuous casting machine according to claim 8, characterized in that, The initial roll gap value is preset according to the thickness of the cast slab produced and solidification shrinkage, and is stored in the upper system of the slab continuous caster.

10. The roll gap setting method for the slab continuous casting machine according to claim 8, characterized in that, After the roll gap setting of the slab continuous caster is completed, the roll gap setting value of each segment is displayed on the PLC control interface of the continuous caster.

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