A method and apparatus for controlling strip wedge in hot strip rolling

Abstract

The application provides a hot continuous rolling strip steel wedge control method and equipment, and relates to the field of metal material processing. The wedge value of the strip steel at the terminal outlet is judged to confirm the real-time condition of the wedge value at the terminal outlet. When the wedge value is greater than the preset wedge value, it indicates that the wedge value is too large and needs to be adjusted. Before the adjustment, the center line offset and the symmetric flatness of the strip steel are further judged. When the two values are within the normal range, the different rolling mill stands are automatically controlled according to the different thicknesses of the strip steel to adjust the wedge of the strip steel. The whole control process does not need human intervention. Only the corresponding control strategy needs to be formulated before production. According to the wedge value, the center line offset and the symmetric flatness at the terminal outlet monitored in the production process, the corresponding rolling mill stand is adjusted adaptively to ensure the production efficiency and the production precision of the whole production line and improve the qualified rate of the products.

Description

Technical Field

[0001] This invention relates to the field of metal material processing technology, and more specifically, to a method and equipment for controlling the wedge shape of hot-rolled strip steel. Background Technology

[0002] Hot-rolled sheet is a high-value-added steel product and an indispensable metal material for industries such as automobiles, construction, home appliances, and food.

[0003] Most hot rolling mills require manual observation and feedback data to control the wedge shape. This control relies entirely on the operator's experience and feel, leading to deviations between the finished wedge shape and the required quality. In actual rolling processes, this compromises the stability of wedge shape control. Furthermore, manual intervention in wedge shaping is time-consuming, inaccurate, and can result in multiple consecutive defective wedges, impacting product yield. Summary of the Invention

[0004] The problem that this invention aims to solve is that existing hot rolling mills rely on human intervention to control the wedge shape, which is inefficient, has poor precision, and affects the product yield.

[0005] To address the aforementioned problems, this invention provides a method for controlling the wedge shape of hot-rolled strip steel, comprising:

[0006] Determine whether the wedge value of the strip at the terminal outlet is greater than the preset wedge value;

[0007] When the wedge value is greater than the preset wedge value, determine whether the centerline offset of the strip is less than the preset offset.

[0008] When the centerline offset is less than the preset offset, determine whether the symmetrical straightness of the strip is less than the preset straightness.

[0009] When the symmetrical flatness of the strip is less than the preset flatness, the thickness range of the strip is determined.

[0010] Based on the thickness range of the strip, the corresponding control strategy is invoked to control the adjustment of multiple roll stands.

[0011] Optionally, the step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes:

[0012] When the thickness of the strip is within the first thickness range, the coiler is controlled to coil and build up the strip. After the coiler has completed coiling and building up the strip, the corresponding control strategy is invoked to control the adjustment of multiple roll stands.

[0013] When the thickness of the strip is within the second thickness range, the corresponding control strategy is directly invoked to control the adjustment of multiple roll stands.

[0014] Optionally, the step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes:

[0015] When the thickness of the strip is within the first thickness range, the multiple roll stands upstream of the process are controlled to adjust, and the roll gap tilt adjustment amount is issued to the multiple roll stands upstream of the process.

[0016] When the thickness of the strip is within the second thickness range, the multiple or all of the roll stands located upstream and downstream of the process are controlled to adjust, and the roll gap tilt adjustment amount is issued to the controlled multiple roll stands.

[0017] Optionally, before invoking the corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands, the method further includes:

[0018] Based on the obtained wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand, the theoretical adjustment amount of each roll stand is analyzed.

[0019] Compare each theoretical adjustment amount with the corresponding maximum adjustment amount of the roll stand;

[0020] Choose the smaller of the theoretical adjustment amount and the maximum adjustment amount as the roll gap tilt adjustment amount.

[0021] Optionally, the step of analyzing the theoretical adjustment amount of the roll stand based on the acquired wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand includes:

[0022] Adjust Fi =P i *(Wedge-Set) value *Sen i

[0023] Among them, Adjust Fi This represents the theoretical adjustment amount for the i-th roll stand;

[0024] P i This represents the adjustment ratio coefficient for the i-th roll stand;

[0025] Wedge represents the detected wedge value;

[0026] Set valueThis represents the preset wedge value;

[0027] Sen i This represents the roll adjustment sensitivity coefficient of the i-th roll stand.

[0028] Optionally, before determining whether the wedge value of the strip at the terminal exit is greater than a preset wedge value, the hot-rolled strip wedge control method further includes:

[0029] The wedge value is received from the multi-functional instrument located at the terminal outlet.

[0030] Optionally, before determining whether the wedge value of the strip at the terminal exit is greater than a preset wedge value, the hot-rolled strip wedge control method further includes:

[0031] Obtain user operation instructions, including wedge control activation instructions.

[0032] Optionally, after determining whether the centerline offset of the strip is less than a preset offset, the hot-rolled strip wedge control method further includes:

[0033] When the centerline offset is greater than or equal to the preset offset, the adjustment amount of the roll mill stand is locked.

[0034] Optionally, the hot-rolled strip wedge control method further includes:

[0035] When a piece of steel is ejected, the adjustment amount of the roll stand at the location where the ejection problem occurs is locked.

[0036] When calibrating the roll stands, the adjustment amount of each roll stand is reset to zero.

[0037] On the other hand, the present invention also provides an automatic control device for wedge shape of hot strip steel, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned wedge shape control method for hot strip steel is implemented.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This invention provides a method and equipment for controlling the wedge shape of hot-rolled strip steel. By determining whether the wedge value of the strip at the terminal exit is greater than a preset wedge value, the real-time status of the wedge value at the terminal exit is confirmed. When the wedge value is less than the preset wedge value, it indicates that the wedge value is normal and no adjustment is needed; when the wedge value is greater than the preset wedge value, it indicates that the wedge value is too large and intervention is required. Before adjustment, the centerline offset and symmetry straightness of the strip steel are further judged. When both values ​​are within the normal range, different roll stands are automatically controlled for strip steel of different thicknesses to adjust the strip wedge shape. The entire control process does not require human intervention. Only a corresponding control strategy needs to be formulated before production. Based on the wedge value, centerline offset, and symmetry straightness monitored during production, the corresponding roll stands are adaptively adjusted to ensure the production efficiency and accuracy of the entire production line and improve the product qualification rate. Attached Figure Description

[0040] Figure 1 A flowchart of a hot-rolled strip wedge control method according to an embodiment of the present invention is shown;

[0041] Figure 2 A flowchart illustrating the analysis of the roll gap tilt adjustment amount in an embodiment of the present invention is shown. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0043] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0044] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0045] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0046] Figure 1 A flowchart of a hot-rolled strip wedge control method according to an embodiment of the present invention is shown. The hot-rolled strip wedge control method includes:

[0047] S100: Determine whether the wedge value of the strip at the terminal exit is greater than the preset wedge value. For example, a hot strip rolling production line has seven roll positions, each supported by a roll stand. The height of the roll stand is adjustable, and the inclination of the roll gap can be adjusted by adjusting the height of the roll stand. The seven roll stands are numbered F1-F7 according to the production process. The terminal exit is the exit at F7, which is the last position in the process flow.

[0048] S200: When the wedge value is greater than the preset wedge value, determine whether the centerline offset of the strip is less than the preset offset; when the wedge value is small and within the quality inspection standard, no adjustment is required; when the wedge value is large, it is necessary to further monitor whether the strip moves within the allowable range of the transport track on the production line. The centerline offset refers to the deviation of the centerline of the strip relative to the centerline of the transport track.

[0049] S300: When the centerline offset is less than the preset offset, it indicates that the strip is in the middle of the transport track and will not deviate in a short time. It is then determined whether the symmetrical straightness of the strip is less than the preset straightness. The symmetrical straightness of the strip is monitored using a straightness detector to prevent excessive thickness differences between the left and right sides of the strip.

[0050] S400: When the symmetrical flatness of the strip is less than the preset flatness, determine the thickness range of the strip.

[0051] S500: Based on the thickness range of the strip, invoke the corresponding control strategy to control the adjustment of multiple roll stands. Different types or thicknesses of strip have different sensitivities to wedge shape. For example, for thinner strip, when performing automatic wedge shape control, only a few roll stands upstream of the process (e.g., roll stands at F1-F4) need to be adjusted to correct the wedge shape. Since the downstream stand straightness of thin strip is sensitive to changes, it is not recommended to adjust the roll stands at F5-F7. However, for thicker strip, the wedge shape can be corrected by adjusting the roll stands at F1-F7.

[0052] S600: When the wedge value is less than or equal to the preset wedge value, it indicates that the wedge value is normal and no adjustment is required; the control program does not need to be started. When the centerline offset is greater than or equal to the preset offset, it indicates that the strip deviates too much from the center position. Continuing to work at this time is dangerous, and the entire production line may need to be temporarily stopped for inspection to allow the strip to return to the center position for transmission. Therefore, the control program needs to be paused. When the symmetrical straightness of the strip is greater than or equal to the preset straightness, it indicates that the difference between the two sides of the strip is too large and cannot be corrected by simple frame adjustment. At this time, the strip needs to be removed from the production line, and the control program needs to be paused.

[0053] In this embodiment, the real-time status of the wedge shape at the terminal exit is first confirmed by determining whether the wedge value is greater than a preset wedge value. When the wedge value is less than the preset wedge value, it indicates that the wedge value is normal and no adjustment is needed; when the wedge value is greater than the preset wedge value, it indicates that the wedge value is too large and intervention is required. Before adjustment, the centerline offset and symmetry straightness of the strip are further judged. When both values ​​are within the normal range, different roll stands are automatically controlled for strips of different thicknesses to adjust the strip wedge shape. The entire control process does not require human intervention. It only requires the formulation of a corresponding control strategy before production. Based on the wedge value, centerline offset, and symmetry straightness monitored during production, the corresponding roll stands are adaptively adjusted to ensure the production efficiency and accuracy of the entire production line and improve the product qualification rate.

[0054] In one embodiment of the present invention, the step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes:

[0055] When the thickness of the strip is within the first thickness range, the coiler is controlled to coil and establish the strip. After the coiler completes the coiling and establishing, the corresponding control strategy is invoked to control the adjustment of multiple roll stands. The first thickness range is less than the second thickness range described below. That is to say, when the strip thickness is thin, in order to prevent the thin strip from running off-center and causing unstable head wedge shape, resulting in large fluctuations in roll gap tilt adjustment and affecting production stability, the coiler can be controlled to coil and establish the thin strip first, and then the corresponding control strategy is executed.

[0056] When the thickness of the strip is within the second thickness range, the corresponding control strategy is directly invoked to control the adjustment of multiple roll stands. For thicker strips, coiling and tensioning can be omitted or not performed in advance; the control strategy can be executed directly to produce the required strip.

[0057] In one embodiment of the present invention, the step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes:

[0058] When the thickness of the strip is within the first thickness range, the multiple roll stands upstream of the process are controlled to adjust, and the roll gap tilt adjustment amount is issued to the multiple roll stands upstream of the process.

[0059] When the thickness of the strip is within the second thickness range, the control adjusts multiple or all of the roll stands located upstream and downstream of the process, and issues roll gap tilt adjustment amounts to the controlled multiple roll stands. The issued roll gap tilt adjustment amount is the amount by which the roll stands need to move up and down, that is, by adjusting the roll stands to create an inclined gap between the rolls or between the rolls and the table surface, thereby giving the strip a wedge shape.

[0060] In this embodiment, the upstream of the process refers to the first point the production process passes through. For example, in this solution, the upstream of the process can be the location of F1-F4, and the downstream of the process refers to the location of F5-F7. Furthermore, the control strategy for multiple roll stands is to adjust multiple stands step-by-step or synchronously in the order from upstream to downstream. Additionally, if a worker wants to forcibly intervene in the adjustment sequence of the stands, intervention can be prioritized.

[0061] For example: when the strip thickness is greater than the first preset value, the roll gap tilt is adjusted using four roll stands at F1-F4; when the strip thickness is greater than the second preset value but less than the first preset value, the roll gap tilt is adjusted using three roll stands at F1-F3; when the strip thickness is greater than the third preset value but less than the second preset value, the roll gap tilt is adjusted using two roll stands at F1 and F2; when the strip thickness is greater than the fourth preset value but less than the third preset value, the roll gap tilt is adjusted using the roll stand at F1. After a specified period, the roll gap tilt is recalculated according to the above strategy. In this embodiment, the specified period can be 800ms.

[0062] like Figure 2 As shown, in one embodiment of the present invention, before invoking the corresponding control strategy according to the thickness range of the strip and controlling the adjustment of multiple roll stands, the method further includes:

[0063] Based on the obtained wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand, the theoretical adjustment amount of each roll stand is analyzed; the roll adjustment sensitivity coefficient can also be called the wedge / roll tilt sensitivity parameter, which refers to the rate of change of the wedge / roll tilt adjustment amount per unit time.

[0064] Compare each theoretical adjustment amount with the corresponding maximum adjustment amount of the roll stand;

[0065] Choose the smaller of the theoretical adjustment amount and the maximum adjustment amount as the roll gap tilt adjustment amount.

[0066] In this embodiment, based on the wedge value collected by the multi-functional instrument at the F7 exit, the adjustment sensitivity coefficient of each stand's rolls issued by the process automation system, the adjustment ratio coefficient issued by the process automation system, and the preset wedge value, the roll gap tilt adjustment amount of each stand is analyzed and calculated, and periodic control with PID closed loop is realized. The roll adjustment sensitivity coefficient determines the speed of stand tilt adjustment; a preset wedge value is set in advance, which acts as a dead zone value. Wedge control is only performed when the absolute value of the actual wedge value is greater than this dead zone value. This prevents frequent roll tilt adjustments when the target wedge value is 0 and the actual wedge value fluctuates around 0, which would affect production stability. Additionally, the maximum adjustment amount for each roll stand can be set in advance to prevent excessive tilt adjustment of a particular stand from affecting production stability.

[0067] In this embodiment, the step of analyzing the theoretical adjustment amount of the roll stand based on the acquired wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand includes:

[0068] Adjust Fi =P i *(Wedge-Set) value *Sen i

[0069] Among them, Adjust Fi This represents the theoretical adjustment amount for the i-th roll stand;

[0070] P i This represents the adjustment ratio coefficient for the i-th roll stand;

[0071] Wedge represents the detected wedge value;

[0072] Set value This represents the preset wedge value;

[0073] Sen i This represents the roll adjustment sensitivity coefficient of the i-th roll stand.

[0074] Adjust i =min(Adjust) Fi Maxvalue i );

[0075] Among them, Adjust i Maxvalue represents the roll gap tilt adjustment amount for the i-th roll stand. i This represents the maximum adjustment amount of the i-th roll stand.

[0076] like Figure 2 Before executing control, the operator needs to pre-select the control mode. The control modes include head control mode and non-head control mode. Head control mode is the control mode that does not include take-up and tension building. Non-head control mode requires controlling the take-up and tension building of the take-up machine before executing wedge control. In head control mode, the wedge value collected at the F7 exit needs to be set to be valid with a 2-second delay in feedback (i.e., wedge values ​​collected within 2 seconds are not used). This removes the initial uncontrolled portion of the head wedge, reduces interference to the control system, improves control accuracy, and the wedge control is selected for use on the operation panel. In non-head control mode, the wedge value collected at the F7 exit needs to be set to be valid with a 2-second delay, and the wedge control is selected for use on the operation panel, controlling the take-up and tension building of the take-up machine. Then, based on the feedback wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand, the theoretical adjustment amount corresponding to each roll stand is calculated and input to the YE interface. After comparison by the PI controller, the smaller value between the theoretical adjustment amount and the maximum adjustment amount of the roll stand is selected as the roll gap tilt adjustment amount output. Figure 2In this context, Fi represents the i-th roll stand. For example, Fi (roll adjustment sensitivity coefficient) represents the roll adjustment sensitivity coefficient corresponding to the i-th roll stand. In addition, when calculating the roll gap tilt adjustment, the integral adjustment coefficient and the adjustment limit value of each roll stand adjustment can be considered. The integral adjustment coefficient is input to the Ki interface, and the adjustment proportional coefficient is input to the Kp interface. The adjustment limit value set in the figure is ±1.2mm. Furthermore, considering potential unforeseen circumstances during production, such as steel spillage at a roll stand or severe strip deviation at the exit, the adjustment amount corresponding to that roll stand can be locked (i.e., the lock signal is input to the HI interface). When changing or standardizing rolls on a roll stand, the adjustment amount corresponding to that roll stand is reset to zero (i.e., the zero signal is input to the S interface).

[0077] In one embodiment of the present invention, before determining whether the wedge value of the strip at the terminal exit is greater than a preset wedge value, the hot-rolled strip wedge control method further includes:

[0078] The system receives the wedge value collected and uploaded by the multi-functional instrument located at the terminal output. It also needs to obtain user operation instructions, including a wedge control activation instruction, allowing the operator to select whether to enable the wedge automatic control program.

[0079] In one embodiment of the present invention, after determining whether the centerline offset of the strip is less than a preset offset, the hot-rolled strip wedge control method further includes:

[0080] When the centerline offset is greater than or equal to the preset offset, the adjustment amount of the roll stand is locked. At the finishing mill exit, the strip centerline deviates, and the offset exceeds -60mm to 20mm (-20±40mm), that is, the preset offset is 40mm, and the wedge control adjustment amount of the F1~F7 stands is locked. Ideally, the strip should be transported in the center of the production line. However, due to mechanical vibrations in the conveyor track, it's impossible to guarantee the strip will remain perfectly centered. It's still necessary to ensure the strip travels within a certain range of the conveyor track, avoiding excessive deviation from the center. If the strip deviates too far from the center, nearing the edge of the conveyor track, it may fall off, causing production stoppage or malfunction. Therefore, a pre-set allowable deviation range for the strip is required. Exceeding this range indicates a dangerous transport condition; the strip cannot be adjusted and the production line must be immediately stopped. The deviated strip should be adjusted or removed from the conveyor track. During shutdown, the roll gap tilt adjustment of the roll stand should remain unchanged. Adjusting this deviated strip has little impact on the output wedge value. Therefore, the adjustments made before shutdown, including the roll gap tilt adjustment, can be reused after restarting. Thus, the roll gap tilt adjustment of the roll stand must be locked during shutdown.

[0081] In one embodiment of the present invention, the hot-rolled strip wedge control method further includes:

[0082] When strip ejection occurs, the roll gap tilt adjustment amount of the roll stand at the location of the ejection problem is locked. After the enable signal of the stand wedge control changes from 1 to 0 (indicating that the wedge control is terminated), the automatic tilt adjustment amount of that stand is locked. As mentioned above, similarly, when strip ejection occurs, it is only necessary to unload the problematic strip from the conveyor track. This has no impact on the individual roll stands. Therefore, in the process of resolving strip ejection, the roll gap tilt adjustment amount before shutdown can continue to be used, thus requiring the roll gap tilt adjustment amount to be locked unchanged.

[0083] When calibrating the roll stands, the roll gap tilt adjustment amount for each roll stand is reset to zero. Since the stands have been recalibrated, the roll gap tilt adjustment amounts obtained during previous adjustments are no longer meaningful; therefore, the previous roll gap tilt adjustment amounts need to be reset to zero, and recalculation is required.

[0084] In addition, within a roll changing cycle, the automatic adjustment amount of the roll wedge for each stand is limited, and the maximum absolute value of the limit can be set to 1mm or 1.2mm, etc. During the limitation period of the strip wedge adjustment amount, the adjustment amount is calculated by the wedge control locking value when the previous strip was thrown ± the limit value issued by the automatic system in this process.

[0085] In one embodiment of the present invention, an automatic control device for wedge shape of hot strip is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned hot strip wedge shape control method is implemented.

[0086] The automatic control equipment for hot strip wedge shape of the present invention has similar technical effects to the above-mentioned control method for hot strip wedge shape of the present invention, and will not be described in detail here.

[0087] If the above control methods are implemented, the impact on actual production will be as follows:

[0088] 1. Steel pile-up accidents caused by wedge-shaped structures are calculated as 5 times per year, with each incident resulting in a 1-hour shutdown.

[0089] Annual benefit = Loss per hour of accident × 5 = 444775 × 5 = 2223875 (yuan)

[0090] 2. The quality concession loss caused by the wedge shape is calculated as follows: three times a year, one coil of steel each time, with each coil of steel weighing 20 tons and each coil of steel weighing 500 yuan / ton.

[0091] Annual profit = Returned steel coils × 3 = 20 × 500 × 3 = 30,000 (yuan)

[0092] The overall annual benefit is 2,223,875 + 30,000 = 2,253,875 (yuan), which effectively reduces production losses.

[0093] The method and equipment described in this invention can perform layered control according to different steel grades and size specifications, and call different numbers of roll stands to participate in the adjustment according to the thickness of the strip, avoiding the participation of all stands in the adjustment. This refines the adjustment process, reduces the number of roll stands for parameter adjustment, reduces vibration in the production process, ensures production stability, and thus promotes improved product precision. It can also reduce steel piling caused by excessive wedges on both sides of the finished strip, avoiding emergency repair downtime due to wedges; reduce quality problems caused by abnormal symmetry and straightness control due to excessive wedges, and reduce product returns caused by wedges; thus ensuring strip quality and enhancing the competitiveness of the industry.

[0094] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A method for controlling the wedge shape of hot-rolled strip steel, characterized in that, include: Determine whether the wedge value of the strip at the terminal outlet is greater than the preset wedge value; When the wedge value is greater than the preset wedge value, determine whether the centerline offset of the strip is less than the preset offset. When the centerline offset is less than the preset offset, determine whether the symmetrical straightness of the strip is less than the preset straightness. When the symmetrical flatness of the strip is less than the preset flatness, the thickness range of the strip is determined. Based on the thickness range of the strip, the corresponding control strategy is invoked to control the adjustment of multiple roll stands; Before invoking the corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands, the method further includes: Based on the obtained wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand, the theoretical adjustment amount of each roll stand is analyzed. Compare each theoretical adjustment amount with the corresponding maximum adjustment amount of the roll stand; Select the smaller value between the theoretical adjustment amount and the maximum adjustment amount as the roll gap tilt adjustment amount; The theoretical adjustment amount for each roll stand is analyzed based on the obtained wedge value, the preset wedge value, and the roll adjustment sensitivity coefficient and adjustment ratio coefficient corresponding to each roll stand. Adjust Fi =P i ×(Wedge-Set value )×Sen i ; Among them, Adjust Fi This represents the theoretical adjustment amount for the i-th roll stand; P i This represents the adjustment ratio coefficient for the i-th roll stand; Wedge represents the detected wedge value; Set value This represents the preset wedge value; Sen i This represents the roll adjustment sensitivity coefficient of the i-th roll stand.

2. The method for controlling the wedge shape of hot-rolled strip steel according to claim 1, characterized in that, The step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes: When the thickness of the strip is within the first thickness range, the coiler is controlled to coil and build up the strip. After the coiler has completed coiling and building up the strip, the corresponding control strategy is invoked to control the adjustment of multiple roll stands. When the thickness of the strip is within the second thickness range, the corresponding control strategy is directly invoked to control the adjustment of multiple roll stands, where the value of the second thickness range is greater than the value of the first thickness range.

3. The method for controlling the wedge shape of hot-rolled strip steel according to claim 1, characterized in that, The step of invoking a corresponding control strategy based on the thickness range of the strip to control the adjustment of multiple roll stands includes: When the thickness of the strip is within a first thickness range, the multiple roll stands upstream of the process are controlled to adjust, and the roll gap tilt adjustment amount is issued to the multiple roll stands upstream of the process. When the thickness of the strip is within the second thickness range, the multiple or all of the roll stands located upstream and downstream of the process are controlled to adjust, and the roll gap tilt adjustment amount is issued to the controlled multiple roll stands. The value of the second thickness range is greater than the value of the first thickness range.

4. The method for controlling the wedge shape of hot-rolled strip steel according to claim 1, characterized in that, Before determining whether the wedge value of the strip at the terminal outlet is greater than a preset wedge value, the method further includes: The wedge value is received from the multi-functional instrument located at the terminal outlet.

5. The method for controlling the wedge shape of hot-rolled strip steel according to claim 1, characterized in that, Before determining whether the wedge value of the strip at the terminal outlet is greater than a preset wedge value, the method further includes: Obtain user operation instructions, including wedge control activation instructions.

6. The method for controlling the wedge shape of hot-rolled strip steel according to claim 1, characterized in that, After determining whether the centerline offset of the strip is less than a preset offset, the method further includes: When the centerline offset is greater than or equal to the preset offset, the roll gap tilt adjustment of the roll mill stand is locked.

7. The method for controlling the wedge shape of hot-rolled strip steel according to any one of claims 1-3 or 4-5, characterized in that, Also includes: When steel ejection occurs in the rolled piece, the roll gap tilt adjustment amount of the roll stand at the location of the steel ejection problem is locked; When calibrating the roll stands, the roll gap tilt adjustment for each roll stand is reset to zero.

8. An automatic control device for wedge-shaped hot strip rolling, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the hot strip wedge control method as described in any one of claims 1-7.

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