Method and system for improving stability of tail of hot-rolled thin-gauge strip steel
By controlling the width of the side guide plate, and coordinating the opening and sequential lifting of the roll gap, the problem of uncontrolled strip shape caused by temperature drop at the tail of thin strip during hot rolling was solved, achieving rapid and precise tail strip shape control, and improving production stability and equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SD STEEL RIZHAO CO LTD
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-12
AI Technical Summary
In the production of hot-rolled wide strip steel, the deformation resistance of the tail of thin strip steel increases due to temperature drop during transportation, which can lead to loss of shape control, deviation, folding, or even tail-wagging. Existing control methods have insufficient response speed and precision, making it difficult to achieve stable control under high-speed rolling.
By coordinating the adjustment of the width of the side guide plate of the finishing mill, the quick opening of the side guide plate, the sequential lifting of the roll gap of the stand, and the protection of the rolling force, the stress state of the strip tail can be finely and coordinatedly adjusted, and the sudden change in strip shape can be suppressed.
It effectively suppresses tailing and steel piling accidents, improves production stability and safety, reduces equipment wear and maintenance costs, and increases the rolling line operation rate.
Smart Images
Figure CN122007178A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of hot-rolled strip technology, specifically relating to a method and system for improving the tail stability of hot-rolled thin strip. Background Technology
[0002] In hot-rolled wide strip steel production lines, thin-gauge strip steel has become a production focus due to its high added value and large market demand. However, when producing this type of product, because the intermediate billet is designed to be thinner, and in the absence of a hot-rolling box on the production line, the tail of the strip experiences a significant temperature drop during transport, leading to a sharp increase in deformation resistance when it enters the finishing rolling zone. This condition triggers the finishing rolling automatic thickness control system (AGC) to lower the roll gap to maintain the exit thickness. However, this adjustment process easily causes an imbalance of force at the tail of the strip, resulting in severe deviation, folding, or even tail-wagging. In severe cases, it can lead to loss of shape control and steel piling accidents, not only causing product scrap but also damaging the roll surface, forcing the production line to stop abnormally for roll replacement, seriously affecting operational efficiency and cost control.
[0003] Currently, conventional strip shape control methods (such as adjusting the single-sided roll gap or bending roll force) are insufficient in response speed and adjustment precision, making it difficult to suppress sudden changes in strip shape at the tail end during high-speed rolling. Therefore, how to achieve rapid, coordinated, and stable strip shape control during the tail-end stage of thin-gauge strip has become a pressing technical challenge in this field.
[0004] In view of this, it is very necessary to provide a method and system for improving the tail stability of hot-rolled thin strip steel to solve the above-mentioned defects in the prior art. Summary of the Invention
[0005] The purpose of this invention is to address the shortcomings of the existing technology, which suffers from insufficient response speed and adjustment precision, making it difficult to suppress sudden changes in tail shape during high-speed rolling. The invention provides a method and system for improving the tail stability of hot-rolled thin strip steel to solve the aforementioned technical problems.
[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for improving the tail stability of hot-rolled thin strip steel includes the following steps: Step S1, the step of controlling the width of the side guide plate, in which: Adjust the width allowance of the side guide plates of each stand in the finishing mill under rolling conditions to make it equal to the first preset value, so as to improve the centering function of the side guide plates and improve the centering accuracy of the rolled piece; Step S2, the quick-opening step of the side guide plate steel throwing, in which: Detect the steel throwing signal of frame F3 and control the side guide plates of frames F5, F6 and F7 to open quickly to the second preset value; Step S3, the step of sequentially raising the roller gap of the frame, in which: The operator manually triggers the movement via buttons to control the F4, F5, F6, and F7 stands of the finishing mill to sequentially raise the roll gap in a delayed manner from downstream to upstream. Step S4, the quick-opening step with the side guide plate, in which: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; Step S5, the rolling force protection step, in which: During the roll gap lifting process, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value.
[0007] Preferably, step S3 specifically includes: When the operator finds that the tail section shape cannot be controlled, in order to avoid rolling abnormalities, click the button to start the sequential lifting of the stand roll gap; The F7 frame immediately begins lifting the roll gap. After a first time interval, the F6 frame begins lifting the roll gap. After a second time interval, the F5 frame begins lifting the roll gap. After a third time interval, the F4 frame begins lifting the roll gap.
[0008] This step can achieve the following technical effects: By increasing the roll gap sequentially from the downstream stand to the upstream stand, and with a time difference, the rolling force in the tail region is actively and gradually reduced, breaking the vicious cycle of tail force caused by the continuous pressure from the AGC system, and providing a key operational means for core control intervention.
[0009] Preferably, step S4 specifically includes: After the F5 frame performs the roll gap lifting operation, the side guide plate is quickly opened at the first preset amplitude after a fourth time interval. After the F6 frame performs the roll gap lifting operation, the side guide plate is quickly opened at the second preset amplitude after a fifth time interval. After the F7 frame performs the roll gap lifting operation, the side guide plate is quickly opened at the third preset amplitude immediately.
[0010] This step can achieve the following technical effects: By dynamically coordinating the roll gap lifting with the rapid opening of the side guide plate, the lateral constraints are released at different times and to different degrees while gradually releasing the rolling pressure. This achieves refined and coordinated adjustment of the stress state at the tail of the strip, suppresses sudden changes in strip shape, and sets up a rolling force protection strategy to avoid the main motor current from being too high and the rolling mill tripping due to changes in the speed of adjacent rolling mills, thus preventing new accidents.
[0011] Furthermore, the present invention also provides a system for improving the tail stability of hot-rolled thin strip steel, comprising: The side guide plate width control module contains: Adjust the width allowance of the side guide plates of each stand in the finishing mill under rolling conditions to make it equal to the first preset value, so as to improve the centering function of the side guide plates and improve the centering accuracy of the rolled piece; The side guide plate steel throwing quick-opening module contains: Detect the steel throwing signal of frame F3 and control the side guide plates of frames F5, F6 and F7 to open quickly to the second preset value; The frame roll gap sequential lifting module, in which: The operator manually triggers the movement via buttons to control the F4, F5, F6, and F7 stands of the finishing mill to sequentially raise the roll gap in a delayed manner from downstream to upstream. The side guide plate works in conjunction with the quick-opening module, which includes: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; The rolling force protection module contains: During the roll gap lifting process, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value.
[0012] Preferably, the frame roll gap sequential lifting module specifically includes: When the operator finds that the tail section shape cannot be controlled, in order to avoid rolling abnormalities, click the button to start the sequential lifting of the stand roll gap; The F7 frame immediately begins lifting the roll gap. After a first time interval, the F6 frame begins lifting the roll gap. After a second time interval, the F5 frame begins lifting the roll gap. After a third time interval, the F4 frame begins lifting the roll gap.
[0013] This module can achieve the following technical effects: By increasing the roll gap sequentially from the downstream stand to the upstream stand, and with a time difference, the rolling force in the tail region is actively and gradually reduced, breaking the vicious cycle of tail force caused by the continuous pressure from the AGC system, and providing a key operational means for core control intervention.
[0014] Preferably, the side guide plate, in conjunction with the quick-opening module, specifically includes: After the F5 frame performs the roll gap lifting, the side guide plate is opened quickly at the first preset amplitude after a fourth time interval. After the F6 frame performs the roll gap lifting, the side guide plate is opened quickly at the second preset amplitude after a fifth time interval. After the F7 frame performs the roll gap lifting, the side guide plate is opened quickly at the third preset amplitude immediately.
[0015] This module can achieve the following technical effects: By dynamically coordinating the roll gap lifting with the rapid opening of the side guide plate, the lateral constraints are released at different times and to different degrees while gradually releasing the rolling pressure. This achieves refined and coordinated adjustment of the stress state at the tail of the strip, suppresses sudden changes in strip shape, and sets up a rolling force protection strategy to avoid the main motor current from being too high and the rolling mill tripping due to changes in the speed of adjacent rolling mills, thus preventing new accidents.
[0016] The beneficial effects of this invention are as follows: It suppresses tail-wagging and steel-piling accidents, significantly improving production stability and safety. By constructing an active and collaborative tail-end control logic, it intervenes before traditional AGC adjustments trigger a vicious cycle, fundamentally preventing strip tail-end deviation, folding, and tail-wagging caused by force imbalance, reducing the risk of steel-piling, and ensuring continuous and stable operation of the rolling line. It breaks through the bottleneck of conventional strip shape control, achieving rapid and precise control of the tail-end strip shape. Addressing the slow response and low precision of conventional methods under high-speed rolling, this invention integrates and optimizes the dynamic control of the side guide plate and the coordinated lifting of the roll gap across multiple stands, forming a closed-loop control strategy with rapid response and precise action. This strategy can timely and effectively suppress sudden changes in tail-end strip shape, solving a long-standing technical problem. It reduces equipment wear and maintenance costs. By avoiding severe tail-end tail-wagging and steel-piling accidents, it directly reduces the impact and damage to the finishing work rolls, support rolls, and transmission system, extending the roll service life, reducing the frequency of abnormal roll changes and related spare parts consumption, thereby saving considerable equipment maintenance and production costs. In addition, it can reduce or avoid unplanned downtime caused by handling tail-end accidents, thus improving the effective operating rate of the rolling line.
[0017] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0019] Figure 1 This is a flowchart of a method for improving the tail stability of hot-rolled thin strip steel provided by the present invention.
[0020] Figure 2 This is a schematic diagram of a system for improving the tail stability of hot-rolled thin strip steel provided by the present invention.
[0021] Among them, 1-side guide plate width control module, 2-side guide plate quick-opening module for throwing steel, 3-frame roll gap sequential lifting module, 4-side guide plate matching quick-opening module, and 5-rolling force protection module. Detailed Implementation
[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following implementation methods.
[0023] Example 1: like Figure 1 As shown in the figure, this embodiment provides a method for improving the tail stability of hot-rolled thin strip steel, which includes the following steps: Step S1, the step of controlling the width of the side guide plate, in which: The opening degree and centering accuracy of the side guide plates of each stand in the finishing mill are controlled within 2mm; Adjust the width allowance of the side guide plates of each stand in the finishing mill under rolling conditions to improve the centering function of the side guide plates and improve the centering accuracy of the rolled pieces; Step S1 specifically includes: The width allowance of the side guide plates on the upstream stands (stands F1-F4) is tightened from 60mm to 30mm to provide strong guidance and centering control, preventing strip deviation at thicker stages. The width allowance of the side guide plates on the downstream stands (stands F5-F7) is looser, reduced to 40mm, because the strip is thinner and cooler at this stage, making it more prone to shape problems. The slightly wider allowance reduces friction and compression on the strip edges, lowering the risk of abrupt shape changes or tail folding induced by side guide plate contact. The specific adjustments to the width allowance of the side guide plates for each stand during rolling are shown in Table 1. Table 1
[0024] This step achieves the following technical effects: By optimizing the width of the side guide plate constraint during the rolling process, a stable and accurate guiding reference is provided for the strip steel. The centering foundation is established from the initial stage of rolling, which can prevent subsequent deviation trends caused by inaccurate initial centering.
[0025] Step S2, the quick-opening step of the side guide plate steel throwing, in which: The steel throwing signal of frame F3 is detected, and the side guides of frames F5, F6 and F7 are controlled to open quickly to 50mm. The short stroke control of the side guides of each frame in the steel throwing state is shown in Table 1.
[0026] This step achieves the following technical effects: This step releases the constraint of the downstream stand side guide plate in advance when the tail of the strip is about to enter the downstream finishing rolling area. This avoids excessive friction or compression between the tail of the strip and the side guide plate due to the decrease in temperature and the increase in deformation resistance, thereby reducing the risk of inducing tail folding or severe deviation.
[0027] Step S3, the step of sequentially raising the roller gap of the frame, in which: The operator manually triggers the movement via buttons to control the F4, F5, F6, and F7 stands of the finishing mill to sequentially raise the roll gap in a delayed manner from downstream to upstream. Step S3 specifically includes: When the operator finds that the tail section shape cannot be adjusted, in order to avoid rolling abnormalities, click the button to start the sequential lifting of the stand roll gap; The F7 frame immediately begins lifting the roll gap. After a delay of 0.05 seconds, the F6 frame begins lifting the roll gap. After a delay of 0.1 seconds, the F5 frame begins lifting the roll gap. After a delay of 0.15 seconds, the F4 frame begins lifting the roll gap.
[0028] This step achieves the following technical effects: By increasing the roll gap sequentially from the downstream stand to the upstream stand, and with a time difference, the rolling force in the tail region is actively and gradually reduced, breaking the vicious cycle of tail force caused by the continuous pressure from the AGC system, and providing a key operational means for core control intervention.
[0029] Step S4, the quick-opening step with the side guide plate, in which: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; Step S4 specifically includes: After lifting the roll gap, the F5 frame opens the side guide plate quickly in a 15mm increment after a 1-second delay. After lifting the roll gap, the F6 frame opens the side guide plate quickly in a 25mm increment after a 0.45-second delay. After lifting the roll gap, the F7 frame opens the side guide plate quickly in a 50mm increment immediately.
[0030] This step achieves the following technical effects: By dynamically coordinating the roll gap lifting with the rapid opening of the side guide plate, the lateral constraints are released at different times and to different degrees while gradually releasing the rolling pressure. This achieves refined and coordinated adjustment of the stress state at the tail of the strip, suppresses sudden changes in strip shape, and sets up a rolling force protection strategy to avoid the main motor current from being too high and the rolling mill tripping due to changes in the speed of adjacent rolling mills, thus preventing new accidents.
[0031] Step S5, the rolling force protection step, in which: During the roll gap lifting process of the stand, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value; the preset rolling force protection values corresponding to each stand are shown in Table 2.
[0032] Table 2
[0033] This step achieves the following technical effects: By setting a lower limit protection for rolling force, the rolling force is prevented from being too low, resulting in unstable bite or slippage due to excessive roll gap lifting, thus ensuring the rolling stability of the entire process and avoiding the risk of increasing new accidents.
[0034] Example 2: like Figure 2 As shown in the figure, this embodiment provides a system for improving the tail stability of hot-rolled thin strip steel, comprising: Side guide plate width control module 1, in which: Adjust the width allowance of the side guide plates of each stand in the finishing mill under rolling conditions to make it less than or equal to the first preset value, so as to improve the centering function of the side guide plates and improve the centering accuracy of the rolled piece; This module can achieve the following technical effects: By optimizing the width of the side guide plate constraint during the rolling process, a stable and accurate guiding reference is provided for the strip steel. The centering foundation is established from the initial stage of rolling, which can prevent subsequent deviation trends caused by inaccurate initial centering.
[0035] Side guide plate steel throwing quick-opening module 2, in which: Detect the steel throwing signal of frame F3 and control the side guide plates of frames F5, F6 and F7 to open quickly to the second preset value; This module can achieve the following technical effects: This module releases the constraint of the downstream stand side guide plate in advance when the tail of the strip is about to enter the downstream finishing rolling area. This avoids excessive friction or compression between the tail of the strip and the side guide plate due to the decrease in temperature and the increase in deformation resistance, thereby reducing the risk of inducing tail folding or severe deviation.
[0036] Frame roll gap sequential lifting module 3, in which: The operator manually triggers the movement via buttons to control the F5, F6, and F7 stands of the finishing mill to raise the roll gap sequentially from downstream to upstream. The aforementioned frame roll gap sequential lifting module 3 specifically includes: When the operator finds that the tail section shape cannot be controlled, in order to avoid rolling abnormalities, click the button to start the sequential lifting of the stand roll gap; The F7 frame immediately begins lifting the roll gap. After a first time interval, the F6 frame begins lifting the roll gap. After a second time interval, the F5 frame begins lifting the roll gap. After a third time interval, the F4 frame begins lifting the roll gap. This module can achieve the following technical effects: By increasing the roll gap sequentially from the downstream stand to the upstream stand, and with a time difference, the rolling force in the tail region is actively and gradually reduced, breaking the vicious cycle of tail force caused by the continuous pressure from the AGC system, and providing a key operational means for core control intervention.
[0037] The side guide plate works in conjunction with quick-opening module 4, in which: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; The side guide plate, in conjunction with the quick-opening module 4, specifically includes: After the F5 frame performs the roll gap lifting, the side guide plate is opened quickly at the first preset amplitude after a fourth time interval. After the F6 frame performs the roll gap lifting, the side guide plate is opened quickly at the second preset amplitude after a fifth time interval. After the F7 frame performs the roll gap lifting, the side guide plate is opened quickly at the third preset amplitude immediately.
[0038] This module can achieve the following technical effects: By dynamically coordinating the roll gap lifting with the rapid opening of the side guide plate, the lateral constraints are released at different times and to different degrees while gradually releasing the rolling pressure. This achieves refined and coordinated adjustment of the stress state at the tail of the strip, suppresses sudden changes in strip shape, and sets up a rolling force protection strategy to avoid the main motor current from being too high and the rolling mill tripping due to changes in the speed of adjacent rolling mills, thus preventing new accidents.
[0039] Rolling force protection module 5, in which: During the roll gap lifting process, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value.
[0040] This module can achieve the following technical effects: By setting a lower limit protection for rolling force, the rolling force is prevented from being too low, resulting in unstable bite or slippage due to excessive roll gap lifting, thus ensuring the rolling stability of the entire process and avoiding the risk of increasing new accidents.
[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The methods disclosed in the embodiments are described simply because they correspond to the systems disclosed in the embodiments; relevant details can be found in the method section.
[0042] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.
[0043] In the embodiments provided by this invention, it should be understood that the disclosed systems, methods, and approaches can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.
[0044] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0045] In addition, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit.
[0046] Similarly, in the various embodiments of the present invention, each processing unit can be integrated into a functional module, or each processing unit can exist physically, or two or more processing units can be integrated into a functional module.
[0047] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
[0048] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0049] The above-disclosed embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any non-creative variations that can be conceived by those skilled in the art, as well as any improvements and modifications made without departing from the principles of the present invention, should fall within the protection scope of the present invention.
Claims
1. A method for improving the tail stability of hot-rolled thin strip steel, characterized in that, Includes the following steps: Step S1, the step of controlling the width of the side guide plate, in which: Adjust the width allowance of the side guide plates of each stand in the finishing mill under rolling conditions to make it equal to the first preset value, so as to improve the centering function of the side guide plates and improve the centering accuracy of the rolled piece; Step S2, the quick-opening step of the side guide plate steel throwing, in which: Detect the steel throwing signal of frame F3 and control the side guide plates of frames F4, F5 and F6 to open quickly to the second preset value; Step S3, the step of sequentially raising the roller gap of the frame, in which: Manually triggered by buttons, the F4, F5, F6, and F7 stands of the finishing mill are controlled to sequentially raise the roll gap in a delayed manner from downstream to upstream. Step S4, the quick-opening step with the side guide plate, in which: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; Step S5, the rolling force protection step, in which: During the roll gap lifting process of the stand, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value.
2. The method for improving the tail stability of hot-rolled thin strip steel according to claim 1, characterized in that, The first preset value for step S1 is 30mm.
3. The method for improving the tail stability of hot-rolled thin strip steel according to claim 1, characterized in that, The second preset value for step S2 is 50mm.
4. The method for improving the tail stability of hot-rolled thin strip steel according to claim 1, characterized in that, Step S3 specifically includes: When the tail section shape cannot be adjusted, in order to avoid rolling abnormalities, click the button to start the stand roll gap sequence lifting; The F7 frame immediately begins lifting the roll gap. After a first time interval, the F6 frame begins lifting the roll gap. After a second time interval, the F5 frame begins lifting the roll gap. After a third time interval, the F4 frame begins lifting the roll gap.
5. A method for improving the tail stability of hot-rolled thin strip steel according to claim 4, characterized in that, The first time interval in step S3 is 0.05 seconds, the second time interval is 0.1 seconds, and the third time interval is 0.15 seconds.
6. The method for improving the tail stability of hot-rolled thin strip steel according to claim 1, characterized in that, Step S4 specifically includes: After the F5 frame performs the roll gap lifting operation, the side guide plate opens at the first preset amplitude after a fourth time interval. After the F6 frame performs the roll gap lifting operation, the side guide plate opens at the second preset amplitude after a fifth time interval. After the F7 frame performs the roll gap lifting operation, the side guide plate opens immediately at the third preset amplitude.
7. A method for improving the tail stability of hot-rolled thin strip steel according to claim 6, characterized in that, The fourth time interval in step S4 is 1 second, and the fifth time interval is 0.45 seconds.
8. A method for improving the tail stability of hot-rolled thin strip steel according to claim 6, characterized in that, The first preset amplitude is 15mm, the second preset amplitude is 25mm, and the third preset amplitude is 50mm.
9. A method for improving the tail stability of hot-rolled thin strip steel according to claim 1, characterized in that, In step S5, the preset rolling force protection value for each stand is: The preset rolling force protection value is 11000KN for F4 stand, 9000KN for F5 stand, 7000KN for F6 stand, and 4500KN for F7 stand.
10. A system for improving the tail stability of hot-rolled thin strip steel, characterized in that, include: The side guide plate width control module contains: Adjust the width allowance of the side guide plates of each stand in the finishing mill under the rolling state to make it equal to the first preset value, so as to improve the centering function of the side guide plates and improve the centering accuracy of the rolled piece; The side guide plate steel throwing quick-opening module contains: Detect the steel throwing signal of frame F3 and control the side guide plates of frames F4, F5 and F6 to open quickly to the second preset value; The frame roll gap sequential lifting module, in which: The operator manually triggers the movement via buttons to control the F5, F6, and F7 stands of the finishing mill to raise the roll gap sequentially from downstream to upstream. The side guide plate works in conjunction with the quick-opening module, which includes: During the process of lifting the roller gap of the frame, the side guide plates of frame F5, frame F6 and frame F7 are controlled to open rapidly according to the preset timing and preset amplitude; The rolling force protection module contains: During the roll gap lifting process of the stand, in order to ensure rolling stability, the roll gap lifting action of the stand is stopped when the rolling force of the stand drops below the preset rolling force protection value.