A method and system for adaptive control of hot coil rhythm

Abstract

The application provides a hot coil rhythm adaptive control method and system, which comprises the following steps: obtaining the next strip steel drawing data, calculating the pass plan preset data, and calculating the running track of the current strip steel and the next strip steel on the hot continuous rolling production line; according to the running track, calculating the time interval of the tail of the current strip steel and the head of the next strip steel at each spatial position of the rolling line, determining the position corresponding to the minimum time interval as the bottleneck point, and determining the minimum time interval as the rolling line bottleneck time; according to the rolling line bottleneck time, the slab action time of the heating furnace, and the conveying time of the slab from the heating furnace to the reference point, calculating the heating furnace drawing countdown time; in the actual running process of the strip steel, collecting multiple actual measurement time points, comparing the actual measurement time points with the corresponding prediction time points, obtaining the time difference, and determining the drawing time of the heating furnace according to the drawing interval time adaptive coefficient and the heating furnace drawing countdown time.

Description

Technical Field

[0001] This invention relates to the field of process control technology for hot strip steel rolling in metallurgy, and particularly to an adaptive control method and system for hot coil rhythm. Background Technology

[0002] The rolling rhythm control of a hot strip rolling production line refers to the time interval between the removal of the heating furnace from two adjacent strips. Under the same conditions, the shorter the rolling rhythm, the higher the hourly output of the production line mill; conversely, the longer the rolling rhythm, the lower the hourly output. Many factors influence the length of the rolling rhythm, directly related not only to process factors (such as slab length, product size, number of passes, and operating conditions) but also closely related to equipment configuration (such as mill layout, number of stands, speed, and motor capacity). Reasonably allocating rolling passes to ensure uniform load on each unit, improving operational efficiency, reducing inter-operation time, increasing deformation within equipment limits, and strengthening rolling discipline can all shorten the rolling rhythm.

[0003] Because the existing control system of the hot-rolled coil production line in the steel rolling mill has no rhythmic steel extraction control method, the timed steel output control model does not take into account the rolling situation of the strip on the rolling line under the existing timed steel output control logic. Therefore, when the rolling rhythm is too fast, the strip often collides with the two strips on the cold roll table or the coiler. Summary of the Invention

[0004] This invention provides a hot-rolled coil rhythm adaptive control method and system to solve the problem in related technologies where timed steel tapping control fails to consider the actual working conditions of the rolling line, frequently causing double steel collisions and scrap accidents at the cooling roller table or coiler when the rolling rhythm is too fast.

[0005] This invention provides a hot-rolling rhythm adaptive control method, comprising: Obtain the next strip steel extraction data and calculate the preset data for the number of passes in the roughing and finishing mills; Based on the preset data of the pass plan, the running trajectory of the current strip and the next strip on the hot continuous rolling production line is calculated, wherein the running trajectory is used to characterize the position and time relationship of the head and tail of the current strip and the next strip respectively; Based on the running trajectory, the time interval between the tail of the current strip and the head of the next strip at each spatial position on the rolling line is calculated, the position corresponding to the minimum time interval is determined as the bottleneck point, and the minimum time interval is determined as the bottleneck time of the rolling line. Using a preset position as a reference point, the countdown time for steel extraction from the heating furnace is calculated based on the bottleneck time of the rolling line, the billet movement time of the heating furnace, and the transfer time of the billet from the heating furnace to the reference point. During the actual operation of the strip steel, multiple actual measurement time points are collected, and the actual measurement time points are compared with the corresponding predicted time points to obtain the time difference. The steel extraction interval time adaptive coefficient is calculated based on the time difference, and the steel extraction time of the heating furnace is determined based on the steel extraction interval time adaptive coefficient and the steel extraction countdown time of the heating furnace.

[0006] In one embodiment of the present invention, determining the position corresponding to the minimum time interval as the bottleneck point and determining the minimum time interval as the rolling mill bottleneck time includes: Calculate the time difference between the tail of the current strip and the head of the next strip at the same coordinate in the set of positions along the entire line from the furnace outlet to the coiler; The minimum value among the various time differences is determined as the bottleneck time of the rolling line, and the position corresponding to the minimum value is determined as the bottleneck point; the countdown time for steel extraction from the heating furnace is controlled so that the bottleneck time of the rolling line is greater than the safe gap time allowed by the equipment.

[0007] In one embodiment of the present invention, the running trajectory includes the running trajectory of the roughing zone; in the process of calculating the running trajectory of the roughing zone, the pass gap time and reverse running time of the reversible rolling of the roughing mill are included in the running trajectory of the roughing zone to form the position and time relationship of the strip during the reversible rolling process of the roughing mill.

[0008] In one embodiment of the present invention, the step of calculating the steel extraction interval time adaptive coefficient based on the time difference includes a handling time adaptive step: collecting the actual running time of the slab on the roller conveyor, calculating the handling time difference between the actual running time and the pre-calculated predicted handling time; determining the handling time adaptive coefficient based on the handling time difference, and using the handling time adaptive coefficient to correct the subsequent slab roller conveyor running time prediction and steel extraction interval time.

[0009] In one embodiment of the present invention, the step of calculating the adaptive coefficient of the steel extraction interval based on the time difference includes a rolling time adaptive step: The time from the stop position of the slab at the entrance of the roughing mill to the stop position of the steel ejection at the exit of the roughing mill is defined as the total time of the pass, which includes the roughing mill pass interval time and the pure rolling time of the roughing mill. Calculate the deviation between the actual total time of the passes and the predicted total time of the passes, and determine the steel extraction interval time adaptive coefficient based on the deviation; according to the adaptive coefficient layer corresponding to the roughing mill speed system, use the steel extraction interval time adaptive coefficient to correct the steel extraction interval time of subsequent slabs.

[0010] In one embodiment of the present invention, the preset position is the inlet of the rough descaling box; the calculation of the steel extraction countdown time of the heating furnace includes: converting the bottleneck time of the rolling line into the steel extraction countdown time of the corresponding heating furnace based on the furnace operation time of each heating furnace and the transfer time of the slab from the corresponding heating furnace to the inlet of the rough descaling box.

[0011] In one embodiment of the present invention, the method further includes a rolling rhythm parameter optimization step: configuring the position of the on-site detection equipment, the speed of the roughing mill and finishing mill, the speed of the roller conveyor, and the physical parameters of the equipment in the hot continuous rolling production line through a rhythm parameter configuration file; adjusting the parameters in the rhythm parameter configuration file according to the actual on-site layout so that the spatial coordinates used by the motion trajectory correspond to the position of the on-site physical equipment; wherein, the on-site detection equipment includes a hot metal detector and a pyrometer.

[0012] This invention also provides a hot-rolled coil rhythm adaptive control system, comprising: a preset module for acquiring the drawing data of the next strip and calculating preset data for the roughing and finishing rolling passes; a trajectory calculation module for calculating the running trajectories of the current strip and the next strip on the hot continuous rolling production line using kinematic equations based on the preset data, wherein the running trajectory characterizes the position and time relationship between the head and tail of the current strip and the next strip; and a bottleneck estimation module for calculating the time interval between the tail of the current strip and the head of the next strip at various spatial positions on the rolling line based on the running trajectory, and determining the most... The location corresponding to the small time interval is determined as the bottleneck point, and the minimum time interval is determined as the rolling line bottleneck time. Based on the rolling line bottleneck time, the heating furnace slab movement time, and the slab transfer time from the heating furnace to the preset position, the heating furnace steel extraction countdown time is calculated in reverse. The adaptive correction module is used to collect multiple actual measurement time points during the actual operation of the strip steel, compare the actual measurement time points with the corresponding predicted time points to obtain the time difference, calculate the steel extraction interval time adaptive coefficient based on the time difference, and determine the heating furnace steel extraction time based on the steel extraction interval time adaptive coefficient and the heating furnace steel extraction countdown time.

[0013] The beneficial effects of this invention are as follows: The hot-rolled coil rhythm adaptive control method and system proposed in this invention acquires pre-set data of the pass plan and calculates the running trajectory of the slab in the rolling line area to find the true rhythm bottleneck point and calculate the most compact safe steel extraction interval time. During the actual strip rolling process, the time deviation of each area on site is collected in real time and a rhythm adaptive coefficient is generated to dynamically correct the subsequent steel extraction time of the heating furnace. While ensuring the safe distance between equipment, the rolling gap is compressed as much as possible, reducing the probability of double steel collision accidents and improving the stability of the production line rhythm and capacity. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0015] In the attached diagram: Figure 1 This is a flowchart illustrating the adaptive control method for hot-rolling rhythm in one embodiment of the present invention. Figure 2 This is a schematic diagram showing the relationship between the position and time of the head and tail of the strip in one embodiment of the present invention; Figure 3 This is a schematic diagram of the module of the hot roll rhythm adaptive control system in one embodiment of the present invention. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0018] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0019] The inventor discovered through research that: The rolling rhythm control of a hot strip rolling production line refers to the time interval between the removal of the heating furnace from two adjacent strips. Under the same conditions, the shorter the rolling rhythm, the higher the hourly output of the production line mill; conversely, the longer the rolling rhythm, the lower the hourly output. Many factors influence the length of the rolling rhythm, directly related not only to process factors (such as slab length, product size, number of passes, and operating conditions) but also closely related to equipment configuration (such as mill layout, number of stands, speed, and motor capacity). Reasonably allocating rolling passes to ensure uniform load on each unit, improving operational efficiency, reducing inter-operation time, increasing deformation within equipment limits, and strengthening rolling discipline can all shorten the rolling rhythm.

[0020] The existing control system in the hot-rolled coil production line of the steel rolling mill lacks a rhythmic steel extraction control method. Under the existing timed steel tapping control logic, the timed steel tapping control model does not consider the rolling conditions of the strip on the rolling line. Therefore, when the rolling rhythm is too fast, it frequently causes two strips to collide at the cold runner or coiler, resulting in double-strip collision scrap accidents. This seriously affects the improvement of the rolling rhythm and production stability of the production line. The main problems with the existing control technology are as follows: 1. The existing timed steel tapping control method requires the operator to set the steel tapping interval. When the rolling rhythm is fast, it often causes the double steel to collide with the scrap steel on the cooling roller table or coiler, affecting the stability of production. 2. The existing control system does not take into account the bottleneck position of the rolling line rhythm, and cannot provide early warning before a double steel collision accident may occur, so the operator cannot intervene in advance.

[0021] Based on the problems existing in the above-mentioned related technologies, the present invention provides a hot roll rhythm adaptive control method and system. The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0022] In this article, "strip drawing data" refers to data used to determine the next strip drawing and rolling process. Strip drawing data may include at least one of the following: steel grade of the next strip, slab size, target product specifications, furnace information, and production plan sequence. The roughing and finishing rolling pass planning calculation program generates preset pass plan data based on the strip drawing data to provide input for speed, pass, and time calculations of the running trajectory.

[0023] Please see Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the adaptive control method for hot-rolling rhythm according to the present invention. The method includes: Step S100: Obtain the steel extraction data for the next strip and calculate the preset data for the number of passes in the roughing and finishing rolling processes.

[0024] In some embodiments, the drawing data for the next strip is first obtained, and the preset data for the roughing and finishing rolling pass plans are calculated. The drawing data can be provided by the heating furnace control terminal or the production planning data source. The roughing and finishing rolling pass plan calculation program is invoked to convert the material properties and target specifications of the next strip into the preset data for the corresponding pass plans.

[0025] Step S110: Calculate the running trajectory of the current strip and the next strip on the hot strip rolling production line according to the preset data of the pass plan. The running trajectory is used to characterize the position and time relationship of the head and tail of the current strip and the next strip. In some embodiments, based on preset data from the pass schedule, the kinematic equations of uniform motion, uniform acceleration, and uniform deceleration are used to calculate the running trajectories of the current strip and the next strip on the hot strip rolling production line. The calculation results include the position and time relationship of the head and tail of the current strip and the next strip. For example, for a uniform speed running section of the roller table, the time for the head and tail of the strip to pass through that section is determined based on the section length and running speed. For an acceleration or deceleration section, the time to pass through that section is determined based on the initial speed, final speed, acceleration, and section length.

[0026] In some instances, please refer to Figure 2 A hot strip rolling production line can include a heating furnace, a roughing mill, a finishing mill, and a coiler along the strip's running direction. After the slab is extracted from the heating furnace, it enters the roughing area via the furnace exit roller table. The intermediate slab is rolled in the roughing mill, then continuously rolled in the finishing mill, and finally coiled by the coiler via the layer cooling roller table. Figure 2 The horizontal position axis corresponds to the physical positions of the heating furnace, roughing mill, finishing mill and coiler on the production line, while the vertical time axis represents the time it takes for the strip to reach the corresponding position. Figure 2 This includes the position and time relationship of the current strip head to form the current strip head trajectory; the position and time relationship of the current strip tail to form the current strip tail trajectory. The next strip uses the same spatial coordinate reference to form the next strip head trajectory and the next strip tail trajectory respectively.

[0027] Step S120: Based on the running trajectory, calculate the time interval between the tail of the current strip and the head of the next strip at various spatial positions on the rolling line, determine the position corresponding to the minimum time interval as the bottleneck point, and determine the minimum time interval as the bottleneck time of the rolling line.

[0028] In some embodiments, the current position, head and tail markers, and predicted arrival times can be recorded for each position in the rolling mill. The predicted times for the tail of the current strip and the head of the next strip are read at the same coordinate system. The position corresponding to the minimum time interval is then determined as the bottleneck point, and this minimum time interval is defined as the rolling mill bottleneck time. The bottleneck point can be located in the roughing mill, finishing mill, laminar flow table, or coiler, and its location varies depending on the specifications and set parameters of adjacent strips. The rolling mill bottleneck time represents the minimum head and tail time interval formed by adjacent strips in the rolling mill region under the current set calculation conditions. Since advancing or delaying the steel extraction time will change the trajectory time and position of the next strip, the control equipment can use the rolling mill bottleneck time as a constraint to adjust the starting point of the next strip's running trajectory in reverse, thereby controlling the overall steel output and rolling rhythm of the production line.

[0029] Step S130: Using a preset position as a reference point, calculate the countdown time for steel extraction from the heating furnace based on the bottleneck time of the rolling line, the billet movement time of the heating furnace, and the transfer time of the billet from the heating furnace to the reference point.

[0030] In some embodiments, the countdown time for steel extraction from the heating furnace is calculated in reverse based on the bottleneck time of the rolling mill, the slab movement time in the heating furnace, and the transfer time of the slab from the heating furnace to the reference point. During the reverse calculation, the bottleneck constraints within the rolling mill are converted into countdown control quantities that the heating furnace can execute. The slab movement time in the heating furnace can include the time taken for the slab to be extracted from its position in the furnace to the exit roller conveyor. The transfer time of the slab from the heating furnace to the reference point represents the running time required for the slab to reach the reference point position after completing the relevant exit actions and entering the exit roller conveyor.

[0031] For example, the time flow for calculating the slab conveying time is based on the HSB inlet of the rough descaling box. The calculation of the furnace extraction time also needs to consider the slab movement time of each furnace and the roller conveying time to the HSB inlet. Finally, the furnace steel extraction countdown time is calculated backwards based on the obtained bottleneck time, as follows: Once the strip extraction data is obtained from the furnace control terminal, the roughing and finishing rolling pass planning calculation program calculates the preset data for the roughing and finishing rolling passes. Based on the preset data for the strip passes in the roughing and finishing rolling, the rolling rhythm program pre-calculates the flow time of the strip in the roughing and finishing rolling zones, thereby determining the bottleneck point and the bottleneck time of the rolling line, and calculating the extraction time of the next strip.

[0032] In some embodiments, after the countdown time for steel extraction is established, the corresponding extraction time is sent to the heating furnace control terminal. The heating furnace control terminal performs countdown calculations according to this time, and extracts steel after the countdown reaches 0. After steel extraction is completed, the next strip becomes the current strip in the subsequent calculations, and the same rhythm calculation is performed on the next strip after that.

[0033] Step S140: During the actual operation of the strip steel, multiple actual measurement time points are collected, the actual measurement time points are compared with the corresponding predicted time points to obtain the time difference, the steel extraction interval time adaptive coefficient is calculated based on the time difference, and the steel extraction time of the heating furnace is determined based on the steel extraction interval time adaptive coefficient and the steel extraction countdown time of the heating furnace.

[0034] In some embodiments, the time difference reflects the deviation between the theoretical operating trajectory and the actual operating process. When the actual time is later than the predicted time, it indicates that the actual time consumption of the corresponding operating segment has increased relatively; when the actual time is earlier than the predicted time, it indicates that the actual time consumption of the corresponding operating segment has decreased relatively. The control equipment determines the steel extraction interval time adaptive coefficient based on the direction and magnitude of the time difference. Then, the steel extraction time sent to the heating furnace is corrected based on the steel extraction interval time adaptive coefficient. The correction can be applied to the prediction of the subsequent slab roller table running time, the prediction of the roughing rolling time, or the steel extraction interval time, so that the operating time deviation detected on-site is incorporated into the subsequent steel extraction rhythm calculation.

[0035] In some embodiments, the steel extraction interval time adaptive coefficient includes a transport time adaptive coefficient. The transport time corresponds to the time it takes for the slab to travel from one detection position to a subsequent detection position on the roller table, distinguished from the pure rolling time during which the slab undergoes plastic deformation in the mill. The actual times when the slab passes through the initial and final detection positions of the roller table section are recorded, and the actual running time of that roller table section is obtained based on the interval between the two times. The predicted transport time uses the same slab, the same beginning and end sections, and the same roller table section to ensure comparability between the actual and predicted transport times, allowing for the calculation of the transport time difference between the two. The transport time adaptive coefficient is determined based on the transport time difference. A correspondence is established between the transport time adaptive coefficient and the roller table section where the deviation occurs, used to correct the predicted running time calculation for subsequent slabs in that roller table section.

[0036] In some embodiments, after reconstructing the trajectory of the subsequent slab using the corrected roller conveyor running time, the time interval between the current strip tail and the subsequent slab head at various positions on the rolling line is recalculated, and the steel extraction interval is updated accordingly. The corresponding adaptive handling time coefficient can be updated after each valid actual running time is obtained. The updated predicted handling time is still incorporated into the current strip tail trajectory and the next strip head trajectory, and the bottleneck point is still determined by the minimum time interval at the same position coordinates.

[0037] In some embodiments, the adaptive coefficient for the steel extraction interval also includes an adaptive coefficient for the rolling time. Adaptive rolling time primarily addresses prediction errors in rolling time caused by mill acceleration / deceleration lag and position tracking deviations during the roughing mill rolling process. The time from the slab's entry stop position to the exit ejection position of the roughing mill is defined as the total pass time. The total pass time includes the roughing mill pass interval time and the pure rolling time of the roughing mill, thus covering all the time from the slab's entry into the roughing mill to the completion of roughing rolling. For the roughing mill unit, the entry stop position and the exit ejection position can be determined according to the corresponding roughing mill pass process setting parameters.

[0038] The rolling time adaptive coefficient is invoked according to the adaptive coefficient layer corresponding to the roughing mill speed regime. The speed regime can be determined by the roughing mill speed status in the preset data of the pass plan. Deviation information obtained under the same or corresponding speed regime is used for subsequent slabs of that layer. When subsequent slabs use different roughing mill speed regimes, the adaptive coefficient layer corresponding to that speed regime is invoked, instead of directly applying the rolling time adaptive coefficient formed under other speed regimes. The rolling time adaptive coefficient is used to correct the predicted rolling time in the roughing zone of subsequent slabs and further correct the steel extraction interval time of subsequent slabs.

[0039] Based on the technical solutions in the above embodiments of the present invention, the problem of frequent double-steel collisions and scrap accidents in the cooling roller table or coiler caused by the existing timed steel tapping method for controlling the overall rolling rhythm of the production line is effectively solved; the problem of the lack of adaptive adjustment in the rolling rhythm control of the production line, and the inability to adaptively adjust the subsequent slab tapping interval time according to the actual working conditions of the rolling line is solved.

[0040] Please see Figure 3Based on the same inventive concept, this invention also provides a hot-rolled coil rhythm adaptive control system, which includes: a preset module 30, used to acquire the drawing data of the next strip and calculate the preset data of the roughing and finishing rolling pass plans; a trajectory calculation module 31, used to calculate the running trajectory of the current strip and the next strip on the hot continuous rolling production line using kinematic equations based on the preset data of the pass plans, the running trajectory being used to characterize the position and time relationship of the head and tail of the current strip and the next strip respectively; and a bottleneck estimation module 32, used to calculate the time interval between the tail of the current strip and the head of the next strip at various spatial positions on the rolling line based on the running trajectory. The system determines the location corresponding to the minimum time interval as the bottleneck point, the minimum time interval as the rolling line bottleneck time, and uses the preset position as the reference point. Based on the rolling line bottleneck time, the heating furnace slab movement time, and the slab transfer time from the heating furnace to the preset position, it reverses the calculation of the heating furnace steel extraction countdown time. The adaptive correction module 33 is used to collect multiple actual measurement time points during the actual operation of the strip steel, compare the actual measurement time points with the corresponding predicted time points to obtain the time difference, calculate the steel extraction interval time adaptive coefficient based on the time difference, and determine the heating furnace steel extraction time based on the steel extraction interval time adaptive coefficient and the heating furnace steel extraction countdown time.

[0041] The interaction process of each module in the specific system has been described in detail in the aforementioned method embodiments, and will not be repeated here.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A hot-rolling rhythm adaptive control method, characterized in that, include: Obtain the next strip steel extraction data and calculate the preset data for the number of passes in the roughing and finishing mills; Based on the preset data of the pass plan, the running trajectory of the current strip and the next strip on the hot continuous rolling production line is calculated, wherein the running trajectory is used to characterize the position and time relationship of the head and tail of the current strip and the next strip respectively; Based on the running trajectory, the time interval between the tail of the current strip and the head of the next strip at each spatial position on the rolling line is calculated, the position corresponding to the minimum time interval is determined as the bottleneck point, and the minimum time interval is determined as the bottleneck time of the rolling line. Using a preset position as a reference point, the countdown time for steel extraction from the heating furnace is calculated based on the bottleneck time of the rolling line, the billet movement time of the heating furnace, and the transfer time of the billet from the heating furnace to the reference point. During the actual operation of the strip steel, multiple actual measurement time points are collected, and the actual measurement time points are compared with the corresponding predicted time points to obtain the time difference. The steel extraction interval time adaptive coefficient is calculated based on the time difference, and the steel extraction time of the heating furnace is determined based on the steel extraction interval time adaptive coefficient and the steel extraction countdown time of the heating furnace.

2. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, The step of determining the position corresponding to the minimum time interval as the bottleneck point and determining the minimum time interval as the rolling line bottleneck time includes: Calculate the time difference between the tail of the current strip and the head of the next strip at the same coordinate in the set of positions along the entire line from the furnace outlet to the coiler; The minimum value among the various time differences is determined as the bottleneck time of the rolling line, and the position corresponding to the minimum value is determined as the bottleneck point; the countdown time for steel extraction from the heating furnace is controlled so that the bottleneck time of the rolling line is greater than the safe gap time allowed by the equipment.

3. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, The running trajectory includes the running trajectory of the roughing zone; in the process of calculating the running trajectory of the roughing zone, the pass interval time and reverse running time of the reversible rolling of the roughing mill are included in the running trajectory of the roughing zone to form the position and time relationship of the strip during the reversible rolling process of the roughing mill.

4. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, The step of calculating the steel extraction interval time adaptive coefficient based on the time difference includes the following steps: collecting the actual running time of the slab on the roller conveyor, calculating the transport time difference between the actual running time and the pre-calculated predicted transport time; determining the transport time adaptive coefficient based on the transport time difference, and using the transport time adaptive coefficient to correct the predicted roller conveyor running time of subsequent slabs and the steel extraction interval time.

5. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, The step of calculating the adaptive coefficient for the steel extraction interval based on the time difference includes an adaptive rolling time step: The time from the stop position of the slab at the entrance of the roughing mill to the stop position of the steel ejection at the exit of the roughing mill is defined as the total time of the pass, which includes the roughing mill pass interval time and the pure rolling time of the roughing mill. Calculate the deviation between the actual total time of the passes and the predicted total time of the passes, and determine the steel extraction interval time adaptive coefficient based on the deviation; according to the adaptive coefficient layer corresponding to the roughing mill speed system, use the steel extraction interval time adaptive coefficient to correct the steel extraction interval time of subsequent slabs.

6. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, The preset position is the inlet of the rough descaling box; the calculation of the steel extraction countdown time of the heating furnace includes: converting the bottleneck time of the rolling line into the steel extraction countdown time of the corresponding heating furnace based on the furnace billet movement time of each heating furnace and the transfer time of the billet from the corresponding heating furnace to the inlet of the rough descaling box.

7. The adaptive control method for hot-rolling rhythm according to claim 1, characterized in that, It also includes a rolling rhythm parameter optimization step: configuring the location of the on-site detection equipment, the speed of the roughing mill and finishing mill, the roller speed, and the equipment physical parameters of the hot continuous rolling production line through the rhythm parameter configuration file; The parameters in the rhythm parameter configuration file are adjusted according to the actual on-site layout so that the spatial coordinates of the motion trajectory correspond to the positions of the on-site physical equipment; wherein, the on-site detection equipment includes a hot metal detector and a pyrometer.

8. A hot-rolling rhythm adaptive control system, characterized in that, include: The preset module is used to obtain the steel extraction data of the next strip and calculate the preset data of the number of passes for roughing and finishing rolling. The trajectory calculation module is used to calculate the running trajectory of the current strip and the next strip on the hot strip rolling production line based on the preset data of the pass plan and using kinematic equations. The running trajectory is used to characterize the position and time relationship of the head and tail of the current strip and the next strip respectively. The bottleneck estimation module is used to calculate the time interval between the tail of the current strip and the head of the next strip at various spatial positions on the rolling line based on the running trajectory. The position corresponding to the minimum time interval is determined as the bottleneck point, and the minimum time interval is determined as the rolling line bottleneck time. Using a preset position as a reference point, the module calculates the countdown time for steel extraction from the heating furnace based on the rolling line bottleneck time, the heating furnace slab action time, and the slab transfer time from the heating furnace to the preset position. The adaptive correction module is used to collect multiple actual measurement time points during the actual operation of the strip steel, compare the actual measurement time points with the corresponding predicted time points to obtain the time difference, calculate the steel extraction interval time adaptive coefficient based on the time difference, and determine the steel extraction time of the heating furnace based on the steel extraction interval time adaptive coefficient and the steel extraction countdown time of the heating furnace.

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