A method and device for controlling the roll gap of a finishing vertical roll

Abstract

The application discloses a kind of roll gap control method and device of finish rolling vertical roll, the control method is by obtaining the width of billet head of intermediate blank, and the preset roll gap of the centering control of the middle position of intermediate blank by finish rolling vertical roll, when the width of billet head is greater than the lower limit value of the roll gap of intermediate blank through finish rolling vertical roll, it is explained that the position of billet head can be blocked in finish rolling vertical roll, then the width of billet head is input into preset calculation model, obtains the offset compensation of finish rolling vertical roll, according to offset compensation, the roll gap of finish rolling vertical roll is adjusted to target roll gap, and the position of billet head of intermediate blank is pulled through finish rolling vertical roll, so that the position of billet head is smoothly bitten into finish rolling vertical roll, after determining that the position of billet head passes through finish rolling vertical roll, finish rolling vertical roll is controlled to decrease from target roll gap to preset roll gap, and the overall control strategy can make the intermediate blank of overwidth finish rolling smoothly, and guarantee the centering control of finish rolling vertical roll to intermediate blank finish rolling, thereby improve the reliability of finish rolling vertical roll control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of finishing stand vertical roll control, and particularly relates to a finishing stand vertical roll gap control method and device. BACKGROUND

[0002] On a hot rolling production line, an intermediate blank is first rolled, and then the intermediate blank is transported to a finishing stand to roll a strip product. A finishing stand vertical roll is arranged at an entrance of the finishing stand, and is used to control a centering position of the intermediate blank. Due to the limitation of the rolling process, the intermediate blank is often excessively wide at the head and tail, and when the excessive width is too large, the finishing stand vertical roll is prone to be blocked, the biting of the finishing stand vertical roll fails, and the hot continuous rolling production line is stopped due to failure.

[0003] Therefore, how to improve the reliability of the finishing stand vertical roll control is a technical problem to be solved at present. SUMMARY

[0004] The finishing stand vertical roll gap control method and device improve the reliability of the finishing stand vertical roll control.

[0005] Embodiments of the present application provide the following solutions:

[0006] In a first aspect, the embodiments of the present application provide a finishing stand vertical roll gap control method, and the method comprises the following steps.

[0007] Obtain a blank head width of an intermediate blank and a preset roll gap of a finishing stand vertical roll, wherein the preset roll gap is a roll gap value of the finishing stand vertical roll for centering control of a middle position of the intermediate blank.

[0008] When the blank head width is greater than a lower limit value of the roll gap, input the blank head width into a preset calculation model to obtain an offset compensation amount of the finishing stand vertical roll, wherein the lower limit value of the roll gap is a minimum roll gap of the intermediate blank passing through the finishing stand vertical roll.

[0009] Adjust the roll gap of the finishing stand vertical roll to a target roll gap according to the offset compensation amount, and pull the blank head position of the intermediate blank through the finishing stand vertical roll.

[0010] After determining that the blank head position passes through the finishing stand vertical roll, control the finishing stand vertical roll to decrease from the target roll gap to the preset roll gap, so as to perform finishing centering control on the middle position.

[0011] In an optional embodiment, the blank head width of the intermediate blank is obtained by the following steps.

[0012] Obtain rolling passes and width measurement data of the intermediate blank.

[0013] When the rolling pass is a last pass, determine a maximum value in the width measurement data as the blank head width.

[0014] In an alternative embodiment, the determining the maximum value in the width measurement data as the head width comprises:

[0015] obtaining rolling process information of the intermediate slab;

[0016] determining whether the intermediate slab is coiled by the coil box according to the rolling process information;

[0017] if not, determining a target data set in the width measurement data according to a preset starting measurement period when a roll load signal of the last pass is received, and determining the maximum value of the target data set as the head width;

[0018] if yes, comparing the current width measurement data with the width measurement data of the last period until a preset ending measurement period is reached and then stopping, and determining the maximum value in the comparison result as the head width.

[0019] In an alternative embodiment, the inputting the head width into a preset calculation model to obtain the offset compensation amount of the finishing vertical mill roll comprises:

[0020] when the intermediate slab is not transported to the finishing vertical mill roll by the coil box, the offset compensation amount K is obtained according to the formula K = B - M, wherein B is the head width, and M is a roll gap lower limit value for transporting the intermediate slab by the coil box;

[0021] when the intermediate slab is transported to the finishing vertical mill roll by the coil box, the offset compensation amount K is obtained according to the formula K = B - N, wherein B is the head width, and N is a roll gap lower limit value for transporting the intermediate slab without the coil box.

[0022] In an alternative embodiment, when the intermediate slab is not transported to the finishing vertical mill roll by the coil box, the roll gap lower limit value M is set as M = 15 mm, and the offset compensation amount K is set as 0 < K ≤ 20 mm;

[0023] when the intermediate slab is transported to the finishing vertical mill roll by the coil box, and the head width is not greater than a width threshold value, the offset compensation amount N is set as N = 7 mm;

[0024] when the intermediate slab is transported to the finishing vertical mill roll by the coil box, and the head width is greater than the width threshold value, the roll gap lower limit value N is set as N = 10 mm, and the offset compensation amount K is set as 7 < K ≤ 30 mm.

[0025] In an alternative embodiment, the determining the head position passing through the finishing vertical mill roll comprises:​

[0026] acquire a rolling force of the finishing vertical roll when a hot rolling production line is in a target state, wherein the target state is that a front feeding roll of the finishing vertical roll is in a loaded state and a rear finishing roll is in a non-loaded state;

[0027] if the rolling force is greater than a pressure threshold value and a duration is in a preset duration interval, it is determined that the head position passes through the finishing vertical roll.

[0028] In an optional embodiment, the control of the finishing vertical roll from the target roll gap to the preset roll gap comprises:

[0029] acquire a roll gap and a pulling speed of the intermediate billet, wherein the roll gap is an interval distance between the finishing vertical roll and the rear finishing roll;

[0030] obtain a speed lower limit of roll gap adjustment according to the roll gap and the pulling speed;

[0031] output a driving instruction of a target speed according to the speed lower limit, so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjustment speed greater than the speed lower limit.

[0032] In a second aspect, the embodiments of the present application also provide a roll gap control device of a finishing vertical roll, and the device comprises:

[0033] an acquisition module, configured to acquire a head width of an intermediate billet and a preset roll gap of a finishing vertical roll, wherein the preset roll gap is a roll gap value for centering control of a middle position of the intermediate billet by the finishing vertical roll;

[0034] an obtaining module, configured to input the head width into a preset calculation model when the head width is greater than a roll gap lower limit value, and obtain an offset compensation amount of the finishing vertical roll, wherein the roll gap lower limit value is a minimum roll gap for passing of the intermediate billet through the finishing vertical roll;

[0035] an adjustment pulling module, configured to adjust a roll gap of the finishing vertical roll to a target roll gap according to the offset compensation amount, and pull a head position of the intermediate billet through the finishing vertical roll;

[0036] a control module, configured to control the finishing vertical roll from the target roll gap to the preset roll gap after it is determined that the head position passes through the finishing vertical roll, so as to perform finishing centering control on the middle position.

[0037] In a third aspect, the embodiments of the present application further provide an electronic device, comprising a processor and a memory coupled to the processor, wherein the memory stores instructions which, when executed by the processor, cause the electronic device to perform the steps of any of the methods in the first aspect.

[0038] In a fourth aspect, the embodiments of the present application further provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods in the first aspect.

[0039] Compared with the prior art, the roll gap control method and device for the finishing vertical roll of the present application have the following advantages:

[0040] The roll gap control of the present application obtains the billet head width of the intermediate billet and the preset roll gap for the centering control of the middle part position of the intermediate billet by the finishing vertical roll. When the billet head width is greater than the lower limit value of the roll gap of the finishing vertical roll through which the intermediate billet passes, it indicates that the billet head position may be blocked on the finishing vertical roll, and the intermediate billet fails to be bitten by the finishing vertical roll. Then, the billet head width is input into the preset calculation model to obtain the offset compensation amount of the finishing vertical roll. According to the offset compensation amount, the roll gap of the finishing vertical roll is adjusted to the target roll gap, and the billet head position of the intermediate billet is pulled through the finishing vertical roll, so that the billet head position is smoothly bitten by the finishing vertical roll. After the billet head position passes through the finishing vertical roll, the finishing vertical roll is controlled to decrease from the target roll gap to the preset roll gap to perform the finishing centering control of the middle part position. The overall control strategy can make the intermediate billet with an excessively wide width smoothly finish rolling, and ensure the centering control of the intermediate billet by the finishing vertical roll, thereby improving the reliability of the control of the finishing vertical roll. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0042] Figure 1 A flowchart of a roll gap control method for a finishing vertical roll provided by the embodiments of the present application is shown in the figure.

[0043] Figure 2 A structural schematic diagram of a roll gap control device for a finishing vertical roll provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the embodiments of the present application.

[0045] On a hot rolling production line, an intermediate blank rolling mill train, a finishing descaling device and a finishing rolling mill train are arranged in sequence. After the intermediate blank rolling mill train finishes rolling the intermediate blank, the finishing descaling device removes the oxide layer on the surface of the intermediate blank, and then the intermediate blank is conveyed to the finishing rolling mill train for finishing rolling. A finishing vertical roll is arranged between the finishing descaling device and the finishing rolling roll. The finishing vertical roll is vertically arranged and is used for centering control of the intermediate blank to prevent the intermediate blank from moving in the width direction. The finishing rolling roll is horizontally arranged to perform finishing rolling on the intermediate blank. Since the end of the intermediate blank is not constrained in the width direction by the material, the width of the blank head of the intermediate blank exceeds the limit after the intermediate blank is finished rolling, and blocking easily occurs at the finishing vertical roll, which causes a deficiency in the reliability of control of the finishing vertical roll. The embodiments of the present application will specifically describe how to improve the reliability of control of the finishing vertical roll.

[0046] Please refer to Figure 1 , Figure 1 A flow chart of a roll gap control method of a finishing vertical roll provided by the embodiments of the present application is shown in FIG. 1. The method comprises the following steps.

[0047] S11, obtaining a blank head width of the intermediate blank and a preset roll gap of the finishing vertical roll. The preset roll gap is a roll gap value for the finishing vertical roll to perform centering control on the middle position of the intermediate blank.

[0048] Specifically, the blank head width is the end width of one end of the intermediate blank entering the finishing vertical roll. It should be noted that, when the intermediate blank is finished rolling, it is constrained by the steel type, rolling width and other conditions. Some intermediate blanks need to be coiled by a coil box and then uncoiled to adjust the first and last positions. The traction direction of the intermediate blank after finishing rolling is the positive direction. The width of the intermediate blank at the positive end is the head width, and the width of the intermediate blank at the negative end is the tail width. If the intermediate blank is not coiled by the coil box, the blank head width is the head width. If the intermediate blank is coiled by the coil box to replace the direction, the blank head width is the tail width. The blank head width can be measured on-line by a width measuring instrument installed on the hot rolling production line. Since the finishing vertical roll is used for centering control of the intermediate blank, in order to ensure the accuracy of the control, the intermediate blank must have an interference amount when it enters the finishing vertical roll. Therefore, the middle position of the intermediate blank and the set roll gap value have a corresponding relationship, and the preset roll gap can be obtained based on the corresponding relationship.

[0049] In a specific embodiment, the blank head width of the intermediate blank is obtained, comprising:

[0050] Obtaining rolling pass and width measurement data of the intermediate bloom; determining the maximum value in the width measurement data as the bloom head width when the rolling pass is the last pass.

[0051] Specifically, the rolling pass represents the rolling number of the intermediate bloom based on the rough rolling process. If the rolling pass is the last pass, it means that the bloom is the intermediate bloom product after being rolled by the last pass. Then, the width of the intermediate bloom is measured to obtain the width measurement data, and the maximum value in the width measurement data is determined as the bloom head width. It can be understood that when the width measurement is implemented, the width measuring instrument is arranged at the outlet of the intermediate bloom rolling mill unit. The width measuring instrument measures the intermediate bloom based on the preset scanning period, judges the validity of the measurement data, and stores the measurement time and the measured width value correspondingly when the measurement data is correct, so as to obtain the width measurement data. The width measurement data can be input into the preset extreme value function, the maximum value is calculated by the extreme value function, and the maximum value is determined as the bloom head width.

[0052] In actual application, the length of the intermediate bloom can reach 50-70m, resulting in a large amount of width measurement data. If the maximum value is calculated by using the extreme value function, there is a calculation redundancy, which will consume a lot of calculation time, resulting in that the corresponding control of the finishing stand cannot be responded in time. Based on this, in one specific embodiment, the maximum value in the width measurement data is determined as the bloom head width, including:

[0053] Obtaining rolling process information of the intermediate bloom; determining whether to use the coil box to curl the intermediate bloom according to the rolling process information; if not, determining the target data set in the width measurement data according to the preset starting measurement period when the rolling roller load signal of the last pass is received, and determining the maximum value of the target data set as the bloom head width; if yes, comparing the current width measurement data with the width measurement data of the last period until stopping after reaching the preset ending measurement period when the rolling roller unload signal of the last pass is received, and determining the maximum value in the comparison result as the bloom head width.

[0054] Specifically, the rolling process information can be the steel grade of the intermediate blank, the strip thickness, and the note information, etc., according to which it can be determined whether the plate coiler is needed to be used to roll the intermediate blank, for example, when the yield strength of the steel grade is too large, and the finished product thickness of the strip is low, the intermediate blank needs to be coiled and uncoiled. When it is determined that the plate coiler is not used to roll the intermediate blank, if the roll load signal of the last pass is received, it indicates that the last pass rolling of the intermediate blank has been started, and then the target data set is determined in the width measurement data based on the starting measurement period, which represents the time period during which the head position of the intermediate blank passes through the width gauge after the start of the last pass rolling. The time period can be set to 5s, that is, from the start of rolling to 5s of the rolling forward direction. The width data measured in this time period can be collected into the target data set, and the maximum value of the target data set is determined as the head width of the blank. Similarly, when the plate coiler is needed to roll the intermediate blank, if the roll unload signal of the last pass is received, it indicates that the intermediate blank has completed the last pass rolling. Then, the current width measurement data is compared with the width measurement data of the last period, and the larger value of the two is always stored. When the terminal measurement period is reached, it indicates that the intermediate blank has completely passed through the measurement position of the width gauge, and then the comparison calculation is stopped, and the maximum value currently stored is determined as the head width of the blank. The terminal measurement period can be set to 0.3s after no width value is measured. After the head width of the intermediate blank and the preset roll gap of the finishing stand vertical roll are obtained, step S12 is entered.

[0055] S12, when the head width of the blank is greater than the lower limit value of the roll gap, inputting the head width of the blank into a preset calculation model to obtain an offset compensation amount of the finishing stand vertical roll, wherein the lower limit value of the roll gap is the minimum roll gap through which the intermediate blank passes the finishing stand vertical roll.

[0056] Specifically, if the head width of the blank is not greater than the lower limit value of the roll gap, it indicates that the intermediate blank can pass through the finishing stand vertical roll normally, and the intermediate blank is controlled to be conveyed to the finishing stand vertical roll for the center control and finishing rolling. Conversely, if the head width of the blank is greater than the lower limit value of the roll gap, it indicates that the intermediate blank may be blocked when passing through the finishing stand vertical roll, and then the head width of the blank is input into the calculation model to calculate the offset compensation amount. The offset compensation amount represents the amount of increase of the roll gap of the finishing stand vertical roll based on the lower limit value of the roll gap when the head width of the blank is greater than the lower limit value of the roll gap. The calculation model can be a comparison table, and the offset compensation amount is determined in the comparison table based on the amount of increase of the head width of the blank greater than the lower limit value of the roll gap. The corresponding relationship between the amount of increase and the offset compensation amount in the comparison table can be determined based on the experience of the technical personnel or based on the calibration test, which will not be described here.

[0057] In practical applications, due to the limitations of the hot rolling process, intermediate billets may need to be coiled via a coil box. The traction force generated by using and not using a coil box differs. If this difference is not differentiated and controlled, the accuracy of the offset compensation calculation will be insufficient. Therefore, in one specific implementation, when the intermediate billet is not conveyed to the finishing mill rolls via a coil box, the traction force of the intermediate billet is relatively large, allowing it to pass through the finishing mill rolls with greater acceleration. The set offset compensation amount can then be relatively small, and thus can be calculated according to the formula... The offset compensation amount K is obtained, where B is the billet head width and M is the lower limit of the roll gap when the intermediate billet is transported via the plate coil box. The offset compensation amount calculated according to this formula is 1 / 2 of the width increment, which is the difference between the billet head width and the lower limit of the roll gap. The lower limit of the roll gap when the intermediate billet is transported via the plate coil box can be set according to the actual scenario. For example, if the lower limit of the roll gap M is set to 15mm, and the width increment is not greater than 15mm, no offset compensation amount is calculated, and the intermediate billet is directly pulled through the finishing vertical roll. When the width increment is greater than 15mm, the offset compensation amount is calculated according to the above formula, that is, for every 1mm increase in width after exceeding 15mm, the roll gap of the finishing vertical roll increases by 0.5mm from the lower limit of the roll gap. Due to the structural limitations of the finishing vertical roll, the offset compensation amount K is set to 0 < K ≤ 20mm.

[0058] Similarly, when the intermediate billet is conveyed to the finishing mill rolls via the coil box, the traction force of the intermediate billet is relatively small, and the set offset compensation amount can be relatively large. Therefore, according to the formula K = BN, the offset compensation amount K is obtained, where B is the billet head width and N is the lower limit of the roll gap for the intermediate billet without being conveyed by the coil box. Since the intermediate billet temperature is high during hot rolling, the function of the finishing mill rolls is to ensure that the intermediate billet is in the middle position of the finishing mill rolls. If indiscriminate compensation is performed according to the above formula, the fluidity of the hot metal will result in poor centering control. Based on this, in a specific implementation, when the intermediate billet is conveyed to the finishing mill rolls via the coil box and the billet head width is not greater than the width threshold, it indicates that there is no need to set the offset compensation amount too large, so the offset compensation amount is set to 7mm; when the intermediate billet is conveyed to the finishing mill rolls via the coil box and the billet head width is greater than the width threshold, the lower limit of the roll gap N is set to 10mm, and the offset compensation amount is calculated according to the formula K = BN. The offset compensation amount K is set to 7 < K ≤ 30mm. The width threshold can be determined based on the specifications and steel grade of the intermediate billet. For example, it can be set to 17mm. When the width increment is less than 17mm, the offset compensation is set to 7mm. When it is not less than 17mm, for every 1mm increase in width, the roll gap of the finishing vertical roll increases by 1mm from the lower limit of the roll gap. After obtaining the offset compensation of the finishing vertical roll, proceed to step S13.

[0059] S13. Adjust the roll gap of the finishing vertical roll to the target roll gap according to the offset compensation amount, and pull the billet head of the intermediate billet through the finishing vertical roll.

[0060] Specifically, the target roll gap is the sum of the preset roll gap and the offset compensation amount, which represents the roll gap value for the billet head to pass through the finishing vertical roll normally. When adjusting the roll gap of the finishing vertical roll, a corresponding adjustment command can be output to adjust the finishing vertical roll from the current roll gap to the target roll gap, so that the billet head can pass through the finishing vertical roll smoothly. After the billet head passes through the finishing vertical roll, the process proceeds to step S14.

[0061] S14. After determining that the billet head position has passed the finishing mill vertical roll, control the finishing mill vertical roll to reduce the target roll gap to the preset roll gap, so as to perform finishing mill centering control on the middle position.

[0062] Specifically, the position of the billet head can be determined based on the loading time of the finishing vertical roll. For example, when the finishing vertical roll reaches the preset time, the position of the billet head is determined to pass through the finishing vertical roll. After the billet head passes through the finishing vertical roll, it means that the finishing vertical roll has "bitten" the intermediate billet. In order to ensure the centering effect of the finishing vertical roll, the roll gap cannot be increased by a large amount throughout the process. Before the finishing roll bites in, the finishing vertical roll needs to be reduced from the target roll gap to the preset roll gap. The centering control of the middle position is carried out to prevent the intermediate billet from moving in its width direction during the finishing process, so as to ensure the finishing quality of the strip.

[0063] In practical applications, because the shape of the billet head in the width direction is not regular, using only the load-carrying time of the finishing mill vertical roll as a judgment marker may lead to misjudgment. Therefore, in one specific embodiment, determining the billet head position via the finishing mill vertical roll includes:

[0064] When the hot rolling production line is in the target state, the rolling force of the finishing vertical roll is obtained. The target state is that the front feed roll of the finishing vertical roll is in a loaded state and the rear finishing roll is in an unloaded state. If the rolling force is greater than the pressure threshold and the duration is within the preset duration range, the billet head position is determined to pass through the finishing vertical roll.

[0065] Specifically, the front feeding roller is an entry pinch roller of the fine descaling device, located at one side of the fine rolling vertical roller close to the intermediate billet rolling unit; the rear fine rolling roller is the first roller of the fine rolling unit (or referred to as F1 rolling mill roller), located at one side of the fine rolling vertical roller close to the fine rolling unit. The front feeding roller is in a loaded state, and the rear fine rolling roller is in a non-loaded state, indicating that the intermediate billet has been pulled through the front feeding roller and has not reached the rear fine rolling roller. The rolling force of the fine rolling vertical roller is obtained. When the rolling force is greater than the pressure threshold and the duration is in the preset duration interval, it indicates that the fine rolling vertical roller successfully "bites" the billet head position, and it is determined that the billet head position passes through the fine rolling vertical roller. Conversely, when the rolling force is greater than the pressure threshold, it indicates that the billet head position has not reached the fine rolling vertical roller. Similarly, when the duration is less than the preset duration interval, it indicates that the billet head position may be passing through the fine rolling vertical roller, and when the duration is greater than the preset duration interval, it indicates that the billet head position may be stuck on the fine rolling vertical roller, and in both cases, the billet head position cannot be determined to pass through the fine rolling vertical roller. The pressure threshold and the duration interval can be set according to actual needs, for example, the pressure threshold is set to 60KN, and the duration interval is set to 0.1-1s.

[0066] In actual application, since the function of the fine rolling vertical roller is to implement the centering effect in the fine rolling process, the running speed of the hot rolling line is relatively fast. If the control speed of reducing the target roll gap to the preset roll gap is low, the first roller of the fine rolling unit may be loaded after the fine rolling vertical roller does not reach the preset roll gap, resulting in that the fine rolling vertical roller does not achieve the expected centering effect. Based on this, in one specific embodiment, the fine rolling vertical roller is controlled to reduce the target roll gap to the preset roll gap, including:

[0067] The roll spacing and the pulling speed of the intermediate billet are obtained, wherein the roll spacing is the spacing distance between the fine rolling vertical roller and the rear fine rolling roller; the speed lower limit for adjusting the roll gap is obtained according to the roll spacing and the pulling speed; the driving instruction of the target speed is output according to the speed lower limit, so as to reduce the target roll gap to the preset roll gap, wherein the target speed is the roll gap adjusting speed greater than the speed lower limit.

[0068] Specifically, the rolling mill gap is divided by the pulling speed to obtain the pulling time, which represents the time for the intermediate blank to reach the post-finishing roller (i.e., the first roller of the finishing mill train) from the finishing vertical roller at the pulling speed. The adjustment amount of the finishing vertical roller from the target roll gap to the preset roll gap is known, and thus the lower speed limit can be obtained by dividing the adjustment amount by the pulling time. The lower speed limit represents the minimum adjustment speed for reducing the target roll gap to the preset roll gap. The roll gap adjustment speed greater than the lower speed limit is the target speed, for example, 15 mm / s. Thus, the driving instruction based on the target speed can reduce the target roll gap to the preset roll gap, which can guarantee the expected centering effect of the finishing vertical roller. It should be noted that the finishing vertical roller has an upper speed limit for adjusting the roll gap due to the structure and adjustment driving mode of the finishing vertical roller. The target speed is between the upper speed limit and the lower speed limit. On the hot continuous rolling production line, the finishing vertical roller gap control strategy of the next cycle is started to work after the tail of the last intermediate blank leaves the F1 rolling mill, so as to guarantee the stable operation of the hot continuous rolling production line.

[0069] Based on the same inventive concept as the control method, the embodiment of the present application also provides a roll gap control device of a finishing vertical roller, which is used for Figure 2 , and the device comprises:

[0070] The acquisition module 201 is configured to acquire a head width of an intermediate blank and a preset roll gap of a finishing vertical roller, wherein the preset roll gap is a roll gap value for the finishing vertical roller to perform centering control on a middle position of the intermediate blank.

[0071] The obtaining module 202 is configured to input the head width into a preset calculation model when the head width is greater than a lower roll gap limit value, and obtain an offset compensation amount of the finishing vertical roller, wherein the lower roll gap limit value is a minimum roll gap for the intermediate blank to pass through the finishing vertical roller.

[0072] The adjustment and pulling module 203 is configured to adjust the roll gap of the finishing vertical roller to a target roll gap according to the offset compensation amount, and pull the head position of the intermediate blank to pass through the finishing vertical roller.

[0073] The control module 204 is configured to control the finishing vertical roller to reduce from the target roll gap to the preset roll gap after determining that the head position passes through the finishing vertical roller, so as to perform finishing centering control on the middle position.

[0074] In an optional embodiment, the acquisition module comprises:

[0075] The first acquisition submodule is configured to acquire a rolling pass and width measurement data of the intermediate blank.

[0076] The first determination submodule is configured to determine a maximum value in the width measurement data as the head width when the rolling pass is a last pass.

[0077] In an alternative embodiment, the first determining sub-module comprises:

[0078] an acquisition unit configured to acquire rolling process information of the intermediate blank;

[0079] a first determining unit configured to determine whether to use a coil box to coil the intermediate blank according to the rolling process information;

[0080] a second determining unit configured to, when the intermediate blank is not coiled by the coil box, determine a target data set in the width measurement data according to a preset starting measurement period upon receiving a roll load signal of the last pass, and determine a maximum value of the target data set as the head width;

[0081] a third determining unit configured to, when the intermediate blank is coiled by the coil box, compare the current width measurement data with the width measurement data of the last period until a preset ending measurement period is reached and then stop, and determine a maximum value in the comparison result as the head width upon receiving a roll unload signal of the last pass.

[0082] In an alternative embodiment, the obtaining module comprises:

[0083] a first obtaining sub-module configured to, when the intermediate blank is not conveyed to the finishing vertical roll by the coil box, obtain the offset compensation amount K according to the formula wherein B is the head width, and M is a roll gap lower limit value for conveying the intermediate blank by the coil box;

[0084] a second obtaining sub-module configured to, when the intermediate blank is conveyed to the finishing vertical roll by the coil box, obtain the offset compensation amount K according to the formula K = B - N, wherein B is the head width, and N is a roll gap lower limit value for not conveying the intermediate blank by the coil box.

[0085] In an alternative embodiment, the first obtaining sub-module comprises a first setting unit configured to, when the intermediate blank is not conveyed to the finishing vertical roll by the coil box, set the roll gap lower limit value M as M = 15 mm, and set the offset compensation amount K as 0 < K ≤ 20 mm;

[0086] the second obtaining sub-module comprises a second setting unit and a third setting unit, the second setting unit is configured to, when the intermediate blank is conveyed to the finishing vertical roll by the coil box and the head width is not greater than a width threshold value, set the offset compensation amount N as N = 7 mm;

[0087] The third setting unit is configured to set the lower limit value N of the roll gap to N=10 mm and the offset compensation value K to 7

[0088] In an optional embodiment, the control module comprises:

[0089] The second obtaining sub-module is configured to obtain the rolling force of the finishing stand vertical roll when the hot rolling production line is in a target state, wherein the target state is that a front feeding roll of the finishing stand vertical roll is in a loaded state and a rear finishing roll is in an unloaded state.

[0090] The second determining sub-module is configured to determine that the billet head position passes through the finishing stand vertical roll when the rolling force is greater than a pressure threshold value and the duration is within a preset duration interval.

[0091] In an optional embodiment, the control module further comprises:

[0092] The third obtaining sub-module is configured to obtain a roll spacing and a pulling speed of the intermediate billet, wherein the roll spacing is a spacing distance between the finishing stand vertical roll and a rear finishing roll.

[0093] The third obtaining sub-module is configured to obtain a roll spacing and a pulling speed of the intermediate billet, wherein the roll spacing is a spacing distance between the finishing stand vertical roll and a rear finishing roll.

[0094] The output sub-module is configured to output a driving instruction of a target speed according to the speed lower limit, so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjustment speed greater than the speed lower limit.

[0095] Based on the same inventive concept as the control method, the embodiments of the present application also provide an electronic device comprising a processor and a memory, the memory being coupled to the processor, the memory storing instructions which, when executed by the processor, cause the electronic device to perform the steps of any one of the control methods.

[0096] Based on the same inventive concept as the control method, the embodiments of the present application also provide a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of any one of the control methods.

[0097] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0098] The intermediate blank head width is acquired, and the preset roll gap of the intermediate blank middle position centering control of the finishing mill vertical roll is acquired; when the intermediate blank head width is greater than the lower limit value of the roll gap of the finishing mill vertical roll, it is indicated that the intermediate blank head position may be blocked on the finishing mill vertical roll, and the intermediate blank head position fails to bite into the finishing mill vertical roll; the intermediate blank head width is input into the preset calculation model to obtain the offset compensation amount of the finishing mill vertical roll; the roll gap of the finishing mill vertical roll is adjusted to the target roll gap according to the offset compensation amount, and the intermediate blank head position is pulled through the finishing mill vertical roll, so that the intermediate blank head position successfully bites into the finishing mill vertical roll; after the intermediate blank head position passes through the finishing mill vertical roll, the roll gap of the finishing mill vertical roll is controlled to decrease from the target roll gap to the preset roll gap, so as to control the intermediate blank middle position centering control in the finishing mill, and the overall control strategy can make the intermediate blank with an excessively wide width smoothly finish rolling, and guarantee the intermediate blank centering control of the finishing mill vertical roll, thereby improving the reliability of the finishing mill vertical roll control.

[0099] Those skilled in the art will appreciate that embodiments of the application can be supplied as methods, systems, or computer program products. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) having computer usable program code embodied thereon.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (modules, systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks. Figure 1 The apparatus for performing the functions specified in one or more flows and / or blocks.

[0101] These computer program instructions can also be stored in a computer readable storage medium capable of directing the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one or more flows and / or blocks. Figure 1 The apparatus for performing the functions specified in one or more flows and / or blocks.

[0102] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0103] Although preferred embodiments of the application have been described herein, it will be apparent to those skilled in the art that various modifications can be made within the scope of the application without departing from the spirit of the application. Accordingly, it is intended that all such possible modifications be included within the scope of the application as set forth in the following claims in which the

[0104] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described herein.

Claims

1. A method for controlling the roll gap of a finishing vertical roll, characterized in that, The method includes: Obtain the blank head width of the intermediate billet and the preset roll gap of the finishing vertical roll, wherein the preset roll gap is the roll gap value of the finishing vertical roll for centering control of the middle position of the intermediate billet; The step of obtaining the width of the intermediate billet head includes: Obtain the rolling passes and width measurement data of the intermediate billet; When the rolling pass is the last pass, the maximum value in the width measurement data is determined as the billet width; When the width of the billet head is greater than the lower limit of the roll gap, the width of the billet head is input into a preset calculation model to obtain the offset compensation amount of the finishing vertical roll, wherein the lower limit of the roll gap is the minimum roll gap through which the intermediate billet passes the finishing vertical roll; The step of inputting the billet width into a preset calculation model to obtain the offset compensation amount of the finishing mill vertical roll includes: When the intermediate billet is not conveyed to the finishing mill rolls by the plate coil box, according to the formula Obtain the offset compensation amount K ,in, B The width of the blank head, M The lower limit of the roll gap for conveying the intermediate billet via the plate roll box; When the intermediate billet is conveyed to the finishing mill roll via the plate coil box, according to the formula Obtain the offset compensation amount K ,in, B The width of the blank head, N The lower limit of the roll gap for the intermediate billet that is not transported by the aforementioned sheet roll box; The roll gap of the finishing vertical roll is adjusted to the target roll gap according to the offset compensation amount, and the billet head of the intermediate billet is pulled through the finishing vertical roll. After determining that the billet head position passes through the finishing vertical roll, the finishing vertical roll is controlled to reduce from the target roll gap to the preset roll gap in order to perform finishing mill centering control on the middle position.

2. The roll gap control method for finishing vertical rolls according to claim 1, characterized in that, Determining the maximum value in the width measurement data as the blank width includes: Obtain the rolling process information of the intermediate billet; Determine whether to use a coiler to roll the intermediate billet based on the rolling process information; If not, when the roll load signal of the last pass is received, the target dataset is determined from the width measurement data according to the preset start measurement period, and the maximum value of the target dataset is determined as the billet width; If so, upon receiving the roll unloading signal for the last pass, the current width measurement data is compared with the width measurement data of the previous cycle until the preset end measurement period is reached, and the maximum value in the comparison result is determined as the billet width.

3. The roll gap control method for finishing vertical rolls according to claim 1, characterized in that, When the intermediate billet is not conveyed to the finishing vertical rolls by the plate coil box, the lower limit of the roll gap is set. M Set as M =15mm, the offset compensation amount K Set to 0 < K≤ 20mm; When the intermediate billet is conveyed to the finishing mill roll via the plate coil box, and the width of the billet head is not greater than the width threshold, then the offset compensation amount is... N Set as N= 7mm; When the intermediate billet is conveyed to the finishing mill roll via the plate coil box, and the width of the billet head is greater than the width threshold, the lower limit of the roll gap is set. N Set as N= 10mm, the offset compensation amount K Set to 7 < K≤ 30mm.

4. The roll gap control method for finishing vertical rolls according to claim 1, characterized in that, Determining the position of the billet head via the finishing mill vertical roll includes: When the hot rolling production line is in the target state, the rolling force of the finishing vertical roll is obtained, wherein the target state is that the front feed roll of the finishing vertical roll is in a loaded state and the rear finishing roll is in an unloaded state. If the rolling force is greater than the pressure threshold and the duration is within the preset duration range, then the billet head position is determined to have passed through the finishing vertical roll.

5. The roll gap control method for finishing vertical rolls according to claim 1, characterized in that, The control of reducing the finishing vertical roll from the target roll gap to the preset roll gap includes: The roll spacing and the traction speed of the intermediate billet are obtained, wherein the roll spacing is the distance between the finishing vertical roll and the rear finishing roll; The lower limit of the speed for adjusting the roll gap is obtained based on the roll spacing and the traction speed. A drive command is output to the target speed according to the lower speed limit, so as to reduce the target roll gap to the preset roll gap, wherein the target speed is a roll gap adjustment speed that is greater than the lower speed limit.

6. A roll gap control device for a finishing vertical roll, characterized in that, The device includes: The acquisition module is used to acquire the blank head width of the intermediate billet and the preset roll gap of the finishing vertical roll, wherein the preset roll gap is the roll gap value of the finishing vertical roll for centering control of the middle position of the intermediate billet. The step of obtaining the width of the intermediate billet head includes: Obtain the rolling passes and width measurement data of the intermediate billet; When the rolling pass is the last pass, the maximum value in the width measurement data is determined as the billet width; The module is used to input the billet width into a preset calculation model when the billet width is greater than the lower limit of the roll gap, and obtain the offset compensation amount of the finishing vertical roll, wherein the lower limit of the roll gap is the minimum roll gap through which the intermediate billet passes the finishing vertical roll; The step of inputting the billet width into a preset calculation model to obtain the offset compensation amount of the finishing mill vertical roll includes: When the intermediate billet is not conveyed to the finishing mill rolls by the plate coil box, according to the formula Obtain the offset compensation amount K ,in, B The width of the blank head, M The lower limit of the roll gap for conveying the intermediate billet via the plate roll box; When the intermediate billet is conveyed to the finishing mill roll via the plate coil box, according to the formula Obtain the offset compensation amount K ,in, B The width of the blank head, N The lower limit of the roll gap for the intermediate billet that is not transported by the aforementioned sheet roll box; The traction module is adjusted to adjust the roll gap of the finishing vertical roll to the target roll gap according to the offset compensation amount, and to pull the billet head of the intermediate billet through the finishing vertical roll. The control module is used to control the finishing mill vertical roll to reduce the gap between the target roll gap and the preset roll gap after the blank head position is determined to pass through the finishing mill vertical roll, so as to perform finishing mill centering control on the middle position.

7. An electronic device, characterized in that, The device includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method according to any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-5.

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